Improve Your Visual Experience with the Top 5 Image Upscalers in 2023

Have you ever found yourself in a situation where you needed to create a poster, but when you enlarged the image, it became distorted and unclear? Or maybe you wanted to bring new life to precious old photographs? If you’re seeking improved image enlargement and picture quality restoration, AI Image Upscaler online free is here to help.

AI-powered image upscalers have revolutionized the way we enlarge images without compromising on quality. The days are gone when you had to rely on complex software to achieve this; now, with the incredible power of AI, you can effortlessly enhance your images for professional and personal purposes. With this in mind, we will explore the top-notch AI image upscaler online free in this article that you can integrate into your photo editing workflow today.

I. What is an image upscaler?

Software/tools designed to enhance the resolution and overall quality of a picture. It analyses existing pixels and intelligently adds new ones to create sharper, more detailed images using advanced AI algorithms. Use Super Resolution to create a single image with twice (or more) the linear resolution if you have old or low-resolution photos that you want to bring up to print quality. That is, the enhanced image is double the width and height of the original, and the number of pixels is quadruple.

AI image upscaler online free1

II. The Image Upscaler is designed for…

  1. Designers and Photographers: To enhance the quality and professionalism of their work, designers and photographers can use Image Upscaler to enlarge low-resolution images and enhance details.
  2. Media and advertising companies: Advertising and media production often require images to be resized for different media channels. Upscaling allows media and advertising organisations to increase the size of low-resolution images while maintaining clarity and detail.
  3. Social media users and bloggers: For social media users and bloggers who share photos on social media, Image Upscaler can also help to improve the quality and visual effects of photos, thereby increasing their appeal and engagement.
  4. Website and e-commerce owners: Web sites and e-commerce platforms with large databases of images can benefit from the Image Upscaler. In this case, upscaling their product images allows them to provide customers with a more detailed and immersive visual experience, leading to increased sales and customer satisfaction.

III. Top five AI Image Upscaler Online free

1. HitPaw Photo Enhancer

HitPaw AI Image Upscaler HitPaw Photo Enhancer is a PC and Mac-based computer program that allows you to upscale your images without reducing their quality. Like most upscalers on our list, HitPaw’s Photo Enhancer can work on many photos, including landscapes, animations, buildings, and nature. This enhancer is also equipped with a face enhancer. So you don’t need to crack open a secondary image editing software after upscaling your photos in HitPaw.

You can also colorize and bring your old photos back to life using one click, saving old memories and making new ones together. HitPaw’s denoise model allows you to automatically remove noise from low-quality photos while also fixing their low-lighting issues without causing harm to the original photo. As a desktop app, HitPaw is an excellent solution for those who want a little more out of their photo upscaler.

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Key Features

  • Available for Android, PC, and Mac
  • Remove noise and sharpen photos while enlarging them
  • Upscale images with no quality loss
  • Upscale to HD, 2K, 4K, and 8K
  • Batch processing for a large number of images


Free PlanMonthly PlanAnnual Plan

Pros & Cons

+Clean and easy user interface
+Available in 16 languages+Free version available
+Packed with editing features
-The subscription is quite expensive
-Doesn’t offer multi-user capability (e.g. teams).

2. Adobe Photoshop (Firefly)

Adobe unveiled an impressive generative AI engine called Adobe Firefly, which has now been seamlessly integrated into Photoshop. With this intention, leveraging the power of AI, Photoshop’s capabilities have expanded to include automatic subject selection, generative fill, and neural filters, enabling significant transformations in image style and mood. Also, incorporating this exciting AI integration will enhance the familiar Photoshop tools that designers and photographers have relied on for years, such as blending modes, image scaling, and GIF creation.

Instead of solely relying on the original pixels of an image, Photoshop can now utilize a neural network to generate new contextual material or pixels. This groundbreaking development takes photo editing to an entirely new level. One of Photoshop’s standout features, the AI Smart Portrait Neural Filter, and Adobe’s AI Generative Fill elevates these advancements even further. With generative fill, users can select a specific portion of an image and input a text-based prompt to transform that aspect of the picture.

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Key Features

  • Incorporated generative AI into Adobe Firefly.
  • Utilized AI-powered subject selection.
  • Leveraged Generative Fill to edit images with AI based on prompts.
  • Employed AI neural filters to apply stylistic transformations to images.


Free TrialMonthly Plan
7 Days$20.99/month

Pros & Cons

+Thought to Composition Instantly
+Highly Safe and Ethical
-The subscription is quite expensive
-Poor Quality of Image Generations

3. Zyro Image Upscaler

Zyro, developed by Hostinger, is a widely used AI website builder that provides an online AI image upscaler. The user-friendly interface ensures a seamless experience when uploading and enhancing your images. Unlike most image upscalers on our list, Zyro’s upscaler only supports two file formats, which may be limiting. However, this interface is best suited for hobbyists and individuals who do not require advanced upscaling features for their work.

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Key Features

  • Compatible with PNG and JPG file formats
  • Simple and user-friendly interface
  • Allows downloading of results without watermarks
  • No limitations on the number of photos to be upscaled



Pros & Cons

+Free and easy to use
+No need to register or sign in
-The output quality is low Upscale image only by 2x Limited file size

4. Canva

Canva is a widely used and user-friendly web-based graphic design tool offering various powerful features. In addition to its AI upscaler, which allows users to upscale images to 4K resolution, Canva also boasts an extensive collection of templates for designing banners and logos. Furthermore, users can purchase premium stock images and paid templates, with prices starting at $1.

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Key features

  • Photo Editing
  • Background Screening
  • Crop Image
  • Customization
  • Design Templates


Free PlanCanva ProCanva Team
3 credits/month$14.99 /month$29.99/month

Pros & Cons

+Seamless workflow.
+Easy to use
+User friendly
-Have to subscribe to a paid account because its template collection doesn’t have any high-quality layouts
-Search function

5. Upscale Pics

Upscale Pics is a website that offers a unique feature – the ability to increase image resolution without compromising quality. What’s remarkable about this image upscaler is its capability to enlarge pictures to any desired size, up to 2X.

Powered by advanced AI upscaling algorithms, Upscale Pics enhances your images by adding intricate details, giving them a professional photographer-like appearance. The website provides a free trial plan for users to experience its features. One of its outstanding qualities is its ability to identify and prioritize important elements, such as text or faces, during the upscaling process.

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Key features

  • Enlarge your images without losing quality with AI. Any resolution up to 8X works
  • Remove the Background and paste the custom background.
  • Remove JPEG noise
  • On-Device Al image upscaler ensuring full privacy crop image.


UpscalePics TrialUpscalepics Plus
Free$3 /month

Pros & Cons

+Eliminates JPEG artifacts
+Allows online resizing of images up to 8X
+Enhances image tonality and adds extra detail
-Displays advertisements
-Processing time can be relatively long

IV. imageenhan AI Upscaler – Your Top Choice as a Free Alternative

Discover the Power of imageenhan – Enhanced by PicUP.Ai, a respected pioneer in AI-driven graphics design and computer vision technology. In imageenhan AI AI Image Upscaler, you can:

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1. Unleash the Brilliance of Your Images – Experience Crystal-Clear Details

Bringing out the best in your images, imageenhan is an unparalleled image enhancement platform. Using the latest technology, this platform allows you to see every intricate detail with the utmost clarity, ensuring your images shine like never before.

2. A Remarkable Image Enhancer for Everyone – Elevate Your Photos in an Instant

No matter what your level of skill, imageenhan is here to revolutionise the way you edit your photos. This online image enhancer is perfect for printing, social media, marketing campaigns, presentations and a myriad of other uses by seamlessly improving pixelated, blurry and low-quality photos. In just a few clicks, you can say goodbye to subpar visuals and hello to stunning, professional-quality images.

3. Free Tool without any additional charges

The tool is completely free and users pay no additional fees or worry about hidden charges.

It doesn’t matter if you are an amateur or an expert, imageenhan offers a wide range of free features that are tailored to suit all skill levels. Give imageenhan a try and start unlocking your creative potential today!

V. How to use imageenhan AI Upscaler?

Let’s take a quick look at the basic steps involved in using the imageenhan AI ImageUpscaler online program.

Step 1.

Access the AI Image Upscaler from the Image Enhancer website. Select and upload an image using the Upload Image button. As an alternative, you can also click on one of the images provided below to use it as an image instead.

Step 2.

Navigate to the right sidebar and click on any of the features you want to use after selecting the image from your device. You can also tweak the settings to suit how you want to use them.

Step 3.

Once you are happy with the settings, click the Download button. This will save your edited image. Before clicking the Download button, select the desired format (JPG or PNG) and adjust the image quality if necessary.

Image upscalers have become indispensable tools for professionals and enthusiasts alike, as visuals now play a crucial role in communication. These innovative solutions allow you to turn your images into stunning masterpieces, whether you’re a photographer, designer, content creator or simply someone who wants to enhance their visual experience. So take your visual content to new heights of quality and impact by exploring the top 5 free AI image upscaler online mentioned above.

2024-05-11 08:11:53

12 Python AI Upscaling Methods for Image Enhancement

Why Image EnhancementIn the realm of Python and AI, image enhancement is especially crucial.During the process of generating, transmitting or transforming an image, it is affected by a number of factors such as light source, imaging system, and channel bandwidth and noise, which may result in degradation of quality such as low contrast, insufficient dynamic range, loss of clarity, and the inclusion of significant noise. Therefore, image enhancement is required. This is a field where Python and AI technologies are increasingly being applied.Definition of Image EnhancementImage enhancement is to improve the quality of an image for some application purpose, and the result of the processing is more suitable for human visual characteristics or machine recognition systems.Enhancement does not increase the information of the original image, but only improves the ability to recognize certain information, and such processing may cause partial loss of other information. Python and AI techniques contribute to achieving this goal effectively.Methods of image enhancement1.Image enhancement methods can be categorized into spatial domain methods and frequency domain methods according to the domain of action. This method can be effectively implemented using Python and AI for upscaling the image quality.Spatial domain method refers to the image spatial domain directly on the pixel gray value operation processing, commonly used gray scale transformation, histogram correction, template convolution, pseudo-color processing, etc..Frequency domain method is to enhance the transformed value of the image in some kind of transform domain of the image, and then obtain the enhanced image by inverse transformation, which is an indirect processing method. AI algorithms can also be used for these frequency domain methods.2. According to the analysis of the frequency characteristics of the image, it is generally believed that the contrast and dynamic range of the entire image depends on the image informationThe contrast and dynamic range of the whole image depend on the low-frequency part of the image information (referring to the overall image), while the edge contour and local details in the image depend on the high-frequency part. Therefore, two-dimensional digital filtering methods are used for image processing, such asHigh-pass filters are used, which help to emphasize the edge contours and detailed parts of the image.Low-pass filters are used to smooth the image and reduce noise.3. Image enhancement methods can be divided into smoothing and sharpening according to the purpose and effect of processing. Python and AI algorithms can help in the effective implementation of these methods for image upscalingSmoothing has a blurring effect on the image, making the image transition natural and soft, suppressing noise; based on the frequency characteristics of the image from the frequency point of view to understand, smoothing is to maintain or strengthen the low-frequency components of the image, weakening or eliminating the high-frequency components of the image.Sharpening can be seen as the inverse operation of smoothing, the effect and purpose is to highlight the details, so that the image outline is clear, contrast; from the perspective of frequency domain processing, sharpening is to enhance the high-frequency components of the image.These methods are based on Python and AI technologies.Next, I introduce 12 ai upscaling methods via python12 python ai upscaling methodsHere, we introduce 12 AI-driven upscaling methods implemented in Python.1.Contrast and brightness enhancementUsage scenario: bright spot (white spot) detection for dark (black) backgroundsRealization,This enhancement can be automated using Python and AI:void adjust(const cv::Mat src, cv::Mat dst, const float brightness, const float contrast){double B = brightness / 255.; double c = contrast / 255.;double k = tan((45 + 44 * c) / 180 * M_PI);double alpha = k;double beta = 127.5 * (1 + B) - k * 127.5 * (1 - B);src.convertTo(dst, -1, alpha, beta);}2.Histogram equalizationHistogram equalization is a whole image mapping, and will not be mapped locally to certain regions, for those parts of the region is dark or light image is not applicable. At the same time, histogram equalization reduces the gray level of the image, causing some details of the image to disappear. Histogram equalization can be effectively performed using Python libraries.It is more suitable for an overall dark or light image. It can make the gray value of the whole image evenly distributed in the whole dynamic range [0,255], so as to increase the contrast of the image.1).Customized cumulative frequency equalization method:Steps:Count the number of pixels per gray value in the imageCalculate the frequency of each gray value pixel and calculate the cumulative frequencyMap the image and the gray value of the image = original gray value of the image * cumulative frequencySingle channel:bool MyEqualizeHist(Mat gray, Mat result) { //Count the number of pixel values ​​from 0 to 255 mapint, intmp; for (int i = 0; i gray.rows; i++) { uchar* ptr = gray.data + i * gray.cols; for (int j = 0; j gray.cols; j++) { int value = ptrj]; mpvalue]++; } } //Count the frequency of 0~255 pixel values, and calculate the counting frequency mapint, double valuePro; int sum = gray.cols*gray.rows; double sumPro = 0; for (int i = 0; i 256; i++) { sumPro += 1.0*mpi] / sum; valueProi] = sumPro; } //Convert based on cumulative frequency for (int i = 0; i gray.rows; i++) { uchar* ptr1 = gray.data + i*gray.cols; for (int j = 0; j gray.cols; j++) { int value = ptr1j]; double p = valueProvalue]; result.atuchar(i, j) = p*value; } } return true;}Multi-channel (RGB):void MyEqualizeHistRgb(Mat image){Mat imageRGB3];split(image, imageRGB);for (int i = 0; i 3; i++){MyEqualizeHist(imageRGBi], imageRGBi]);}merge(imageRGB, 3, image);imshow("result", image);}2).opencv comes with equalizeHist():equalizeHist(Mat src, Mat dst).Steps:Calculate the histogram H of the input image (8-bit);Normalize the histogram H so that the histogram bins sum to 255;Calculate the integral of the histogram; H′i=∑ 0≤ji H(j);Transform the image using H′ as a look-up table (look-uptable), the transformation formula for specific pixel values is: dst(x,y)=H(src(x,y))This algorithm normalizes the brightness and increases the contrast of the image,the result will be different from the customized one.3).Adaptive local histogram equalizationLocal histogram process:Set a template (rectangular neighborhood) of a certain size and move it along the image pixel by pixel;For each pixel position, calculate the histogram of the template region, and perform histogram equalization or histogram matching transformation on this local region, and the transformation result is only used for the gray value correction of the center pixel point of the template region;The template (neighborhood) moves row by row and column by column in the image, traverses all pixel points, and completes the local histogram processing of the whole image.python and AI make it easier to adapt histograms locally for upscaling.c++ code://C++cvtColor(img,gray,COLOR_BGR2GRAY);PtrCLAHE clahe = createCLAHE();clahe-apply(gray, dst);Python code://pythonclahe = cv2.createCLAHE(clipLimit=2.0, tileGridSize=(4,4)) # Create CLAHE objectimgLocalEqu = clahe.apply(img) # Adaptive local histogram equalizationtitleGridSize: template (neighborhood) size for local histogram equalization, optional, default (8,8)clipLimit: threshold for color contrast, optional, default 83.Exponential transformation enhancementExponential transformation (Power-Law) formula: S = c * R ^ r, through a reasonable choice of c and r can be compressed grayscale range, the algorithm to c = 1.0/255.0, r = 2 to achieve.Tested with a darker image, the actual effect is darker. Consistent with the formulas reasoning, the actual pixel value is replaced with the smaller value from the lookup table.Custom index enhancement algorithm:void Enhance::ExpEnhance(IplImage* img, IplImage* dst){ // Since oldPixel:1,256], you can save a lookup table first uchar lut256] ={0}; double temp = 1.0/255.0; for ( int i =0; i255; i++) { luti] = (uchar)(temp*i*i+0.5); } for( int row =0; row img-height; row++) { uchar *data = (uchar*)img-imageData+ row* img-widthStep; uchar *dstData = (uchar*)dst-imageData+ row* dst-widthStep; for ( int col = 0; colimg-width; col++) { for( int k=0; kimg-nChannels; k++) { uchar t1 = datacol*img-nChannels+k]; dstDatacol*img-nChannels+k] = lutt1]; } } } }// OpenCV versions before 2.1 used the IplImage* data structure to represent images, and versions after 2.1 used the image container Mat to store them.//Mat dstImage = cvarrToMat(dst1); // Convert IplImage format to Mat format// IplImage dst1= (IplImage)(dst);// Convert Mat type image to IplImage// The following is the original version using Mat.void Enhance::ExpEnhance(Mat img,double c, int r){ if(img.channels() != 1) { cvtColor(img,img,COLOR_BGR2GRAY); } uchar lut256] ={0}; for ( int i =0; i255; i++) { luti] = (uchar)( c * pow(i,r) +0.5); cout c*i*i+0.5endl; } for(int i = 0;i img.rows; i++) { for(int j = 0;j img.cols; j++) { int pv = img.atuchar(i,j); img.atuchar(i,j) = lutpv]; } }}Note:Some blogs use expf(n) to calculate the nth power of e. Personally, I think it is wrong. expf(100) is already inf infinity. Implemented in Python, AI algorithms can further optimize exponential transformation.srcmat.atuchar(i, j) = (unsigned char)(255.0 *(expf(srcmat.atuchar(i, j) - low_bound) / expf(up_bound - low_bound))); 4.Gamma enhancementSpecial exponential enhancement, Gamma correction based on power transformation is a very important nonlinear transformation in image processing, it is the opposite of the logarithmic transformation, it is the gray value of the input image for the exponential transformation, which corrects the deviation in brightness. Python and AI methods provide more options for gamma correction and enhancement. Usually, Gamma correction is used to expand the details of dark tones. Generally speaking, when the value of Gamma correction is greater than 1, the highlights of the image are compressed and the dark tones are expanded; when the value of Gamma correction is less than 1, on the contrary, the highlights of the image are expanded and the dark tones are compressed.output = L^γWhen γ is less than 1, the low grayscale interval is stretched and the high grayscale interval is compressed;When γ is greater than 1, the low grayscale interval is compressed and the high grayscale interval is stretched;When γ is equal to 1, it simplifies to a constant transform.1. Fixed cubic enhancement:void Enhance::gammaEhance(Mat image){Mat imageGamma(image.size(), CV_32FC3);for (int i = 0; i image.rows; i++){for (int j = 0; j image.cols; j++){imageGamma.atVec3f(i, j)0] = (image.atVec3b(i, j)0])*(image.atVec3b(i, j)0])*(image.atVec3b(i, j)0]);imageGamma.atVec3f(i, j)1] = (image.atVec3b(i, j)1])*(image.atVec3b(i, j)1])*(image.atVec3b(i, j)1]);imageGamma.atVec3f(i, j)2] = (image.atVec3b(i, j)2])*(image.atVec3b(i, j)2])*(image.atVec3b(i, j)2]);}}//Normalized to 0~255 normalize(imageGamma, imageGamma, 0, 255, CV_MINMAX);//Convert to 8bit image display convertScaleAbs(imageGamma, imageGamma);imshow("gammacubic enhancement", imageGamma);}2. Custom coefficient enhancement:Mat Enhance::gammaWithParameter(Mat img, float parameter){//Create lookup table file LUTunsigned char LUT256];for (int i = 0; i 256; i++){//Gamma transform definitionLUTi] = saturate_castuchar(pow((float)(i / 255.0), parameter)*255.0f);}Mat dstImage = img.clone();//When the input image is a single channel, Gamma transformation is performed directlyif (img.channels() == 1){MatIterator_uchariterator = dstImage.beginuchar();MatIterator_uchariteratorEnd = dstImage.enduchar();for (; iterator != iteratorEnd; iterator++)*iterator = LUT(*iterator)];}else{//When the input channel is 3 channels, each channel needs to be transformed separatelyMatIterator_Vec3biterator = dstImage.beginVec3b();MatIterator_Vec3biteratorEnd = dstImage.endVec3b();//Conversion by lookup tablefor (; iterator!=iteratorEnd; iterator++){(*iterator)0] = LUT((*iterator)0])];(*iterator)1] = LUT((*iterator)1])];(*iterator)2] = LUT((*iterator)2])];}}return dstImage;}5.Log conversion enhancementEffective. Test transparent items blurred boundary enhancement after obtaining good results.Logarithmic transformation can expand the low gray value and compress the high gray level value, so that the gray level distribution of the image is more in line with the visual characteristics of the human eye.After proper processing, the contrast of low gray areas in the original image will be increased and dark details will be enhanced.python libraries often have built-in functions for logarithmic transformation, useful in AI upscaling.The logarithmic transformation formula is:y = log(1+x)/bwhere b is a constant used to control the degree of curvature of the curve, where the smaller b is the closer it is to the y-axis and the larger b is the closer it is to the x-axis. The x in the expression is the pixel value in the original image and y is the transformed pixel value.Realization:void logEhance(Mat image){Mat imageLog(image.size(), CV_32FC3); for (int i = 0; i image.rows; i++){for (int j = 0; j image.cols; j++){imageLog.atVec3f(i, j)0] = log(1 + image.atVec3b(i, j)0]);imageLog.atVec3f(i, j)1] = log(1 + image.atVec3b(i, j)1]);imageLog.atVec3f(i, j)2] = log(1 + image.atVec3b(i, j)2]);}}//Normalized to 0~255 normalize(imageLog, imageLog, 0, 255, CV_MINMAX);//Convert to 8bit image display convertScaleAbs(imageLog, image);//imshow("Soure", image);imshow("Log", image); }6.Laplace Ehance enhancementHas a sharpening effect, more sensitive to noise, need to do the smoothing process first.Used to improve the blurring due to diffusion effect is particularly effective, because it is consistent with the model of downscaling. Diffusion effect is a phenomenon that often occurs in the imaging process.The Laplacian operator is generally not used in its original form for edge detection because, as a second-order derivative, the Laplacian operator has an unacceptable sensitivity to noise; at the same time, its magnitude produces an arithmetic edge, which is an undesired result of complex segmentation; and lastly, the Laplacian operator does not detect the direction of the edge. AI algorithms can mitigate the noise sensitivity of the Laplacian operator.Realization:void Enhance::laplaceEhance(Mat image){Mat imageEnhance;Mat kernel = (Mat_float(3, 3) 0, -1, 0, 0, 5, 0, 0, -1, 0); //A variety of convolution kernels are available. //Mat kernel = (Mat_float(3, 3) 0, 1, 0, 1, -4, 1, 0, 1, 0); //Mat kernel = (Mat_float(3, 3) 0, -1, 0, -1, 4, -1, 0, -1, 0); //Mat kernel = (Mat_float(3, 3) 0, 1, 0, 1, 3, 1, 0, 1, 0); //Mat kernel = (Mat_float(3, 3) 0, -1, 0, -1, 5, -1, 0, -1, 0);filter2D(image, imageEnhance, CV_8UC3, kernel);imshow("laplaceEhance", imageEnhance);}7.Linear transformationTheres not much to say, its just a straightforward linear transformation. Linear transformations are straightforward to implement in Python for upscaling purposes.y = kx+b.Realization:Mat Enhance::linearTransformation(Mat img, const float k, const float b){ Mat dst = img.clone(); for(int i=0; iimg.rows; i++) { for(int j=0; jimg.cols; j++) { for(int c=0; c3; c++) {float x =img.atVec3b(i, j)c];dst.atVec3b(i, j)c] = saturate_castuchar(k* x + b); } } }return dst;}8.Segmented linear stretching algorithmA commonly used algorithm in image grayscale transformation, which also has a corresponding function in the commercial image editing software Photoshop. Segmented linear stretching is mainly used to improve image contrast, highlighting the image details. Python and AI are effective tools for segmented linear stretching, which improves image contrast.Customized enhancement, weakened pixel intervals:void Enhance::PiecewiseLinearTrans(cv::Mat matInput, float x1, float x2, float y1, float y2){//Calculate straight line parameters//L1float K1 = y1 / x1;//L2float K2 = (y2 - y1) / (x2 - x1);float C2 = y1 - K2 * x1;//L3float K3 = (255.0f - y2) / (255.0f - x2);float C3 = 255.0f - K3 * 255.0f;//build lookup table uchar LUT256] ={0};for (int m = 0; m 256; m++){if (m x1){LUTm] = m * K1;}else if (m x2){LUTm] = m * K3 + C3;}else{LUTm] = m * K2 + C2;}}//grayscale mapfor (int j = 0; j matInput.rows; j++){for (int i = 0; i matInput.cols; i++){//Lookup table gamma transformation int x = matInput.atuchar(j,i); matInput.atuchar(j,i) = LUTx];}}}9.Gray level layeringThe simplest example is the commonly used opencv binarization algorithm: thresh, inRange can be. Python libraries like OpenCV offer functions for gray level layering in AI upscaling.10.Overexposure to the image inverseJust do a 255-x operation on the value. This is easily achieved using Python code and can be part of an AI upscaling pipeline.Realization:void ExporeOver(IplImage* img, IplImage* dst){for( int row =0; row height; row++){uchar *data = (uchar*)img-imageData+ row* img-widthStep;uchar *dstData = (uchar*)dst-imageData+ row* dst-widthStep;for ( int col = 0; colwidth; col++){for( int k=0; knChannels; k++){uchar t1 = datacol*img-nChannels+k];uchar t2 = 255 - t1;dstDatacol*img-nChannels+k] = min(t1,t2);}}}}11.High contrast retentionHigh-contrast retention is mainly the image of the color, dark and light contrast between the two parts of the junction retained, such as the image of a person and a stone, then the outline of the stone and the outline of the line of the person and the face, clothing, and other obvious lines of the place will be changed to be retained, the child of the other large-scale changes in dark and dark without obvious changes in the place of generation of medium-gray. python and AI algorithms make high-contrast retention more accurate.The expression form is:dst = r*(img Blur(img)).Realization:Mat HighPass(Mat img){Mat temp;GaussianBlur(img, temp,Size(7,7),1.6,1.6); int r=3;Mat diff = img + r*(img-temp); //High contrast preservation algorithmreturn diff;}12.Masaic algorithm (mosaic)In the daily sometimes confidential or other needs to mosaic the image, the following algorithm to achieve the image mosaic function (principle: the center pixel to represent the neighboring pixels).uchar getPixel( IplImage* img, int row, int col, int k){ return ((uchar*)img-imageData + row* img-widthStep)col*img-nChannels +k];} void setPixel( IplImage* img, int row, int col, int k, uchar val){ ((uchar*)img-imageData + row* img-widthStep)col*img-nChannels +k] = val;}//nSize: is the size, odd number//Replace the value of the neighborhood with the value of the center pixelvoid Masic(IplImage* img, IplImage* dst, int nSize){ int offset = (nSize-1)/2; for ( int row = offset; row img-height - offset; row= row+offset) { for( int col= offset; colimg-width - offset; col = col+offset) { int val0 = getPixel(img, row, col, 0); int val1 = getPixel(img, row, col, 1); int val2 = getPixel(img, row, col, 2); for ( int m= -offset; moffset; m++) { for ( int n=-offset; noffset; n++) { setPixel(dst, row+m, col+n, 0, val0); setPixel(dst, row+m, col+n, 1, val1); setPixel(dst, row+m, col+n, 2, val2); } } } }}ConclusionThe above many methods in practice sometimes are not used alone, filtering and the combination of each method with each other often achieve better results.If you have a need for image enhancement, you can also use the tools on our website to realize it!The use of Python and AI for image upscaling and enhancement is highly effective and offers a range of methods to improve image quality.

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2024-05-11 07:56:25

Free Image Search Sites with CC0 Licenses: The Ultimate Resource for All Your Creative Needs in 2023

IntroductionAre you a designer struggling to find the perfect image references? Or perhaps a content creator concerned about copyright infringement when sourcing images from Google? Whether youre a graphic designer, blogger, marketer, or someone in need of visually compelling images, the quest for the right visuals can be challenging. Thankfully, theres a wide array of free image search sites that offer a variety of creative solutions. In this article, well explore the top 10 free image search sites, highlighting their unique features, advantages, and disadvantages.Why Opt for Professional Free Image Search Sites?Finding high-quality images is crucial, whether for personal or commercial projects. However, to avoid legal complications, its essential to use professional free image search sites that offer legally licensed and copyright-compliant images. These platforms collaborate with photographers and artists who have explicitly permitted the distribution of their work. By sourcing images from these sites, you can confidently sidestep any legal pitfalls related to copyright infringement.In todays digital landscape, where copyright infringement is a pressing issue, relying on professional free image search sites is indispensable. Most images on these platforms come with a Creative Commons Zero (CC0) license, allowing users to freely use, share, and modify the content. This ensures peace of mind when it comes to copyright compliance.Top 10 Free Image Search Sites for CC0-Licensed and Public Domain Images in 20231. Adobe StockAdobe Stock offers an intuitive interface, making it easy to find the visuals you need. While some assets are premium, there are also free options, catering to various budgets without the need to scour multiple platforms.ProsCons+Well-designed interface+Broad selection of content+Free media available-Expensive-Best used as part of Adobe Creative Cloudadobe stock overview2. UnsplashUnsplash is a prominent online photography community that boasts a staggering number of over 50,000 contributing photographers. Their API has seamlessly integrated with more than 500 products, including Apple TV, the App Store, and the Chrome web store.Renowned for its exceptional quality and Creative Commons Zero (CC0) licensing, Unsplash has become a go-to destination for stunning photographs. This popular platform continuously updates its content by releasing 10 new photos every 10 days. Furthermore, it offers a comprehensive search feature, allowing users to easily find images across a wide range of themes, such as business, nature, and restaurants.ProsCons+Free online service+Millions of photos to choose from+High quality downloads+New optional subscription service-Photographers may not benefit from much remuneration-Anyone can use the same photosunsplash overview3. ShutterstockShutterstock stands as one of the most sought-after platforms for stock media. Its vast media library boasts an impressive collection of over 200 million images, catering to the diverse needs of users. However, its worth noting that a significant portion of these images come with a pay-per-use scheme or require proper attribution, unlike the media offered by Pexels.ProsCons+Vast gallery+Free trial+Easy to find content-Large subscription-Premium content not hidden by defaultshutterstock overview4. PexelsPexels is an exceptionally well-curated and extensive compilation of public domain photographs. With its user-friendly interface, you can effortlessly navigate through various categories or utilize the search feature to find exactly what youre looking for. The best part is, all images on Pexels are entirely free to use, requiring no attribution whatsoever.ProsCons+The images are royalty-free. +Don’t have to create an account, we just download the image and it’s ready to go.+The images are very friendly to people who like to use Adobe Photoshop.-Most of photos are photoshopped-Depending on what you search for on Pexels you’ll only find a few images that match your searchpexels overview5. Public Domain PicturesPublic Domain Pictures is a platform that provides an extensive collection of free, high-quality images, graphics, and vectors available for download. The platform efficiently organizes these visuals into various categories, facilitating convenient browsing and selection.ProsCons+Free online service +The wealth of choices +public domain-The picture is easy to be the same as others, not special enough. -Picture quality variespublic domain pictures overviewConclusionWhen it comes to finding the perfect visual content, these Top 10 Excellent Sources for CCO-Licensed and Free Public Domain Images provide a wide range of choices for every creative need. From free stock photos to premium licensed content, these platforms cater to diverse budgets and requirements. If you find suitable images from the websites mentioned above that require super-resolution or watermark removal, you can visit our website.While each website has its own unique features and limitations, they all serve as valuable resources for enhancing your visual projects and communication endeavors.

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2024-05-11 07:57:10

How to Use Image Upscaler: HD Images in Three Steps

Have you ever wondered how to use an image upscaler or photo upscaler to convert your images from low resolution to HD quality? Youve come to the right place. As technology has evolved, image upscalers, often referred to as image enlargers or photo upscalers, have become essential tools for photographers, designers, and everyday users. This article outlines three steps that not only teach you how to use an image scaler but also let you experience its clear benefits.What is image upscaler?An image upscaler, also known as an image enlarger or photo upscaler, is a tool designed to boost the resolution and amplify the details of an image using advanced image interpolation techniques. Unlike traditional image enlargement methods, modern image upscalers often use deep learning techniques to achieve more precise and detailed image enhancement. In his research,, With deep learning techniques, image upscalers are able to recognize and recover elusive details in an image with significant results compared to traditional techniques.Several fields widely use image upscalers, such as:Photography: Upscaler can help photographers restore clarity from old photos or low-resolution images so that they remain sharp on the big screen or in high-definition prints.Design and Art: Designers and artists use upscaler to fine-tune images, ensuring that details are not distorted when enlarged.Film and Video Post-Production: In video editing, upscaler are often used to restore and enhance old movies or low-quality video footage.Scientific: In the fields of medicine and geographic information systems (GIS), image upscalers help to better analyze image data and reveal its hidden information.The core advantage of this technology is its ability to add missing information to an image, resulting in higher resolution and better image quality.Choosing the right image upscalerChoosing the right image upscaler is the key to ensuring image quality and results. There are a variety of image amplification tools on the market, but their core technologies and performance vary greatly. In the selection process, the following points should be considered:1. Core technology: Deep learning-based image upscalers offer significant advantages in detail recovery and image quality compared to traditional amplification methods. a 2021 paper clearly states that deep learning techniques can more accurately identify and recover details in an image.2. User ratings: A quick overview of the strengths and weaknesses of the tool can be obtained by looking at the ratings and feedback from other users. High ratings usually mean that the tool works well in real-world applications.3. Ease of use: For most users, a simple user interface and intuitive operation are key factors when choosing a tool. A good image upscaler should not only be highly technical, but also easy to use.4. Price and Service: Different tools may have different pricing strategies. Considering the budget and frequency of use, it is wise to choose the most cost-effective tool. Also, make sure that the chosen tool offers good customer support and service.5. Data security: The tool you choose should safeguard the privacy and security of user data during image upload and processing.Why ImageEnhan.com is the best choice for image enlargement?1、Deep Learning Technology: Unlike many traditional image enlargement tools, ImageEnhan.com utilizes advanced deep learning technology to accurately identify and recover details in an image, ensuring that the image remains sharp even after enlargement.2、User Reviews: A great tool is often well received by its users. Based on tons of positive feedback, ImageEnhan.com has earned the trust of users.3、Easy to use: ImageEnhan.coms interface is designed to be user-friendly and does not require specialized knowledge, making it easy for even first-time users to get started.4. Value for Money: Compared to its high-quality services, ImageEnhan.com is free of charge. At the same time, its excellent customer support ensures that any problems encountered by users in the course of use can be resolved in a timely manner.5. Privacy Protection: In the digital era, data security is a growing concern. ImageEnhan.com strictly follows a privacy policy to ensure that all images uploaded by users are strictly protected and will not be used by third parties.These unique features and advantages make ImageEnhan.com stand out from the rest of the image enlargement tools and make it the best choice for image enlargement.Three Easy Steps to High Definition Image QualityStep 1: Visit ImageEnhan.com and upload your images1. Open your browser and visit ImageEnhan.com2. On the main screen, look for the Upload Image button or area. Click this button or simply drag and drop your image into the designated area.tips:For best results, it is recommended that you upload an image with a resolution of no less than 300300 pixels.Step 2: Select and Adjust Zoom Settings1. Once the image has been uploaded, you will be directed to the Settings screen.2. Select the magnification (e.g. 2x, 4x) according to your needs.Tips: If you are not sure which settings are best for your image, try the default settings first and then fine-tune them based on the results.Step 3: Start image enlargement and download the results1. Wait for the site to finish processing. Processing time may vary depending on the image size and settings selected. 3.2. Once the enlargement is complete, you can preview the results. If you are satisfied, click the Download button to save the HD image to your device.Conclusion:In this guide, we explored the importance of image enlargement and how to choose the right image upscaler. Whats more, we have provided you with an easy step-by-step tutorial based on ImageEnhan.com to help you achieve HD image quality with ease.Advancements in technology have provided us with countless handy tools, with image upscalers being among them. With such tools, you can not only enhance the quality of your images but also add depth and detail to your designs and projects. Dont stand still, try and utilize these advanced technologies now to bring more value to your work or personal projects. Want to learn more in-depth knowledge about image enhancement? We recommend you to visit https://cirl.lcsr.jhu.edu, an authoritative research site on Neural Image Enhancement to provide you with richer resources and knowledge.

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