Most voted "image-processing" questions
Image processing is the application of a set of techniques and algorithms to a digital image to analyze, enhance or optimize image features such as sharpness and contrast.
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answer225
viewsSave frames/ images of a video
Hello, I need to save pictures/frames from a video. The idea is to create a preview of the film before it starts. The problem is I’m not being able to implement the examples I found. First example…
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answers354
viewsTensorflow - What is the best model to perform real-grade training?
I’m developing a college project to carry out recognition of the real notes through Tensorflow, but the big problem is that the real notes have a lot of similarity between them, mainly on the back…
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answers53
viewsRead and view Polsar images (Large amount of data)
I would like to know if you know any method for reading and viewing images that have a large amount of data and that it is not possible to load everything in RAM (+- 20 GB)I could see and think of…
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answer48
viewsSetting an array element with a Sequence
I’m with a program in python and opencv that reads an image and then checks the colors of the image at each position of two for nestled. How I’m making a threshold in the image to facilitate the…
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answer464
viewsError importing image: Allowed memory size
I’m using a simple script to crop the image, while cropping some images it gives this error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 155648 bytes) in…
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answers153
viewsMatch of the contours
I created the program below, to make the correction of tests. https://gist.github.com/andreemidio/d2cdf3d301fd8df1677e9a315ff845f0 I was able to outline, identify the fillers, I need to match the…
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answer245
viewsIs it possible to access the Hough transform accumulator using opencv?
I am with this small prolema, I searched a lot on the internet and in the documentation but I did not find anything related, I need to know what the accumulation value of each circle generated by…
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answer2434
viewsMerge a Plot and image into Matlab
I’m conducting a medical imaging work that aims to isolate the area of the lungs and place an outline. I isolated the area corresponding to the lungs and created a Plot with the contours. My…
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answer51
viewsLengthy client side image rendering
I use on a web page images that are loaded from a field of type blob in the Firebird. The images open in a modal, fully loaded, that is, without using thumbnails, and when the user clicks on one of…
php html twitter-bootstrap image-processing encodeasked 9 years, 7 months ago Giancarlo Abel Giulian 3,999 -
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answers121
viewsPerformance when drawing an image
Currently I use the Drawimage method of the Graphics class. However, the speed of drawing in the components is very slow. How can I optimize its use ? Libraries like Monogame or Opentk can perform…
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answers325
viewsInterpret replies from responsive card
I would like to know if there is a library capable of processing a scanned image of a reply form (similar to the one used in ENEM). I have found a software that is capable of doing this, which is…
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answer34
viewsWhat is the use of variables of type Int32rect
I downloaded a project that works with images and in some cases it uses variables of this type, I did not understand what the purpose of this type of variable in image processing.
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answer704
viewsHow to know the dimensions of an image that is in array of bytes or Base64?
I have the following code: var binario = _documentoWord.Content.EnhMetaFileBits; string img64Bytes = ""; var base64 = Convert.ToBase64String(binario, 0, binario.Length); byte[] imageBytesBase64 =…
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answer564
viewsGrayscale in Images - OPENCV
Good afternoon Personal, I have an image . bmp and want to turn it into grayscale (0-255), through Opencv with C++(I don’t want to save this image in grayscale). From there, I want to go through the…
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answers1234
viewsRemoving the background of an image - python
I’m developing a code to remove the background of an image, I’m trying to use the Canny border detector to elaborate a mask and try to remove a piece of pipe from the image: The code I’m working on…
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answer68
viewsLapis design effect with opencv and python
I want to get the result of the image further to the right, so I can only get to the middle image using a Canny filter and a Gaussian filter. Does anyone know how I can get this result? import cv2…
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answers46
viewsHelp Gaussian filter application
PPM filtroDeGaus(PPM img){ int l,c,a,b,s=0; int mask[5][5] = {{ 2, 4, 5, 4, 2 }, { 4, 9, 12, 9, 4 }, { 5, 12, 15, 12, 5 }, { 4, 9, 12, 9, 4 }, { 2, 4, 5, 4, 2 }}; for( l= 2; l < img.l-2; l++){…
image-processingasked 7 years, 2 months ago David Franklin 21 -
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answer660
viewsProblems with Gaussian filter application
The function should only apply the Gaussian filter to a PPM image, but the result is several overlaid filtered images. Any suggestions ? [Edit] image before filter | image after filter | expected…
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answer131
viewsSpringboot does not render image (only if restarting)
I have an entity called Product that has only Title, Price and wayImage, the latter guards the way in which the product image is saved. Upon receiving this form data my service executes this code:…
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answer554
viewsImage compression without changing content format (png, jpeg, gif, webp)
The difference from this question to duplicates: keep the content format (png, jpeg, gif, webp), in order not to harm images with layers, transparency, etc. The others do not have. I have a file…
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answer229
viewsPython Multidimensional Array Problem
Basically my algorithm imports all the photos I have inside a directory (dataset_train), saving these photos in vector X and the name of the folder where it was in vector Y. import os import cv2…
python array image-processing multidimensional-arrayasked 5 years, 7 months ago Felipe Ricardo dos Santos 46 -
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answer69
viewsimage processing (KNN classifier) - python
When using Kneighborsclassifier, I am getting the following error: /Feature Extraction (Python)/KNNpy:58: DataConversionWarning: A column-vector y was passed when a 1d array was expected. Please…
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answers765
viewsHow to turn a div with 4 images into just one?
I have an HTML code like this: <div class="conteudoFrente"> <div id="draggable"> <div class="draggableFrase"> </div> </div> </div> The div with the class…
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answer1108
viewsHow to create color palette in MATLAB?
How do I make a color palette in MATLAB? I just want the palette, as in the image, and not graphics or things like that....…
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answers290
views3D reconstruction MATLAB
I am developing my TFG with Matlab where from a figure in Upper Image 20X20 and a figure Lower tbm 20x20 I get the possible kernel in other N central images. However to present the result I need to…
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answers92
viewsFind image database for opencv
Is there a website that has natural scene image banks for image processing applications that can be used on opencv?
image-processingasked 9 years, 5 months ago asc 19 -
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answers307
viewsHow to normalize multiple images in Matlab
I have a set of 1000 randomly generated images through the Gaussian noise, as I would to normalize them (same standard deviation and same average for all images). THANK YOU!!
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answers284
viewsHow to recognize specific objects in an image with PHP?
Hello I am at this moment in Hackathon Google I/O and the challenge is to assemble a software that identifies the fruit of COCOA in a crop image, the question is : How will I do it using php ?…
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answer226
viewsimage module does not run on iPython3
I’m still a beginner in the world of programming, and I recently came across a problem that is still unsolved. I’m using an interactive online book to learn python (How to think like a computer…
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answers2258
viewsHow can I calculate the width when resizing an image that must be 3 X 4, knowing only the height?
Use the PHP to be able to process images in a given system. I need the photos to contain the 3x4 ratio. That’s how the system works: 1 - User takes webcam photo. 2 - An ajax is sent to PHP to…
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answers314
viewsDisplay text in python application
I’m developing an application that makes people count by video, but it is showing the count by the terminal, how do I display "Found N people" on the video screen? follows my code: print…
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answer270
viewsApply color palette to raw image
I have an image at gray levels and I want an algorithm to apply a color palette to it. Does anyone have a reference of an algorithm technique used or anything like that? I’m not experienced with…
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answers24
viewsFilling a series of images from data in a table
I need to make portfolios for about 500 people, I have a table with the name and image attached and I want to know how to put this data in the portfolio template.
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answers99
viewsImage Processing? Doubt on the subject and usability
You guys talk all right ? I have a doubt if that’s the same name of the theme Image Processing I don’t know if you’ve ever looked there are some apps that carry a proposal like this. There is a…
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answer2245
viewsScript to recognize similarity between images
Good afternoon Everybody, all right? I am starting my studies in Python together with Opencv, and I want to perform the reading of images and display the degree of similarity between them. Ex: I…
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answers1220
viewsAspect ratio of an image resized with Opencv?
I have a project where I need to identify objects in an image, currently using the Opencv library in C++. I used the function warpPerspective() Opencv on a 605x141 size image to resize your…
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answers35
viewsUnitary test for filter application
I want to create a unitary test for the method: public BufferedImage negativo(BufferedImage image) { int width = image.getWidth(); int height = image.getHeight(); for (int i = 0; i < width; i++)…
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answers263
viewsWatermark in photos
Good person, I’m doing my TCC and now I’m implementing a photo gallery, but I need these photos present a watermark that the user choose previously, I’m using the nanoGallery2 to show the gallery/…
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answer78
viewsHow to know each pixel of a superpixel in Matlab?
I am doing a program in Matlab using the computer vision addon. I used the superpixel function to get the array of Abels. From what I understand this matrix represents which label (superpixel) each…
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answer1033
viewsAdjust Image Range using Python
I’m a beginner in python, but I have experience with other programming languages. I need to do some college work, but I don’t know how to proceed. I would like to know how to adjust the range of an…
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answers113
viewsHow to make a Gradient Map (2 colors) in an Image?
I need a solution to turn the color of an image into black and white. There are 3 ways to do this, using Grayscale that technically plays white to gray, making the saturation stay -100 and through…
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answer177
viewsDraw picture centered vertical line
I am working with Python image processing using the PIL and Matplotlib library and I am not succeeding in the following purpose: I have the image below. I would like to draw on it a vertical and…
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answers91
viewsOpencv - C++ - Raspberry Pi
I want the function to check all the time if there is a fingerprint. If there is, I want you to start the capture scheme in sequence (the for nested), but the function I created is not working that…
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answer72
viewsPoint-to-point operation on image
I am trying to perform a simple sum operation that adds 30 to the intensities on each channel, but the program only hangs without error output (probably some type error). I hit that reply //…
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answers123
viewsCreate samples of various positive Opencv images
I’m creating an Aarscade to find a part of the eye, but I can’t create the image samples. I have a file containing the path for all positive images and one for all negative images, but when it comes…
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answer722
viewsHow to plot graphically with the colors of each pixel of the image?
I am working on the color recognition of images, with this, I am converting the RGB image to Lab, because it is the color space closest to the human view. Once this is done, I take each of the 3…
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answer73
viewsI cannot perform color conversion after image rotation
I’m developing an algorithm that rotates images every 10 degrees. For this, I am identifying the center of my region of interest, not the center of the image, because it has region of interest that…
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answer26
viewsError in GDI+ when selecting active frame
I have a problem when I try to split multi-page TIFF files. As I divide the files, I save each page in a temporary folder and save a JPG from that TIFF to use it as a thumbnail of the image in…
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answers95
viewsImage SVM classifier does not work
Hello, I’m with a program in Python that uses the library Dlib 19.10, the classifier uses an xml file to learn the images and then I run the following code that creates a file. svm for the…
python algorithm opencv image-processing artificial-intelligenceasked 5 years, 8 months ago Marcos Paulo S. Rezende 351 -
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answer100
views"Skeletonize" figures
I wrote code to "skeletonize" figures, that is, to reduce their thicknesses to just one pixel. I had already written the code in Python that worked correctly. However, the same code rewritten to…