I am implementing a Harris corner detector for educational purposes but I'm stuck at the harris response part. Basically, what I am doing, is: Compute image intensity gradients in x- and y-direct...

Background The JavaScript ES6 specification supports module imports aka ES6 modules. The static imports are quite obvious to use and do already have quite a good browser support, but dynamic impo...

As part of my Bachelor-Thesis, I'm trying to implement a corner detector with the Harris and Stephens algorithm: A combined Corner and Edge Detector I do calculate: The x- and y- deviations with...

i'm trying to find a good way to detect if a feature exists before P/Invoking. For example calling the native StrCmpLogicalW function: [SuppressUnmanagedCodeSecurity] internal static class SafeNat...

My div that uses vh is not working in some browsers, so I want to check if it is supported. I found this article by Lea Verou on the subject, but I'm really not sure how to use it with a CSS value:...

According to this Wikipedia article Feature Extraction examples for Low-Level algorithms are Edge Detection, Corner Detection etc. But what are High-Level algorithms? I only found this quote from...

I am currently testing Flann feature matching with OpenCV in python, and do not fully understand what some of the parameters actually do. Here is a snippet of code copied from the OpenCV docs. The ...

I get often confused with the meaning of the term descriptor in the context of image features. Is a descriptor the description of the local neighborhood of a point (e.g. a float vector), or is a de...

I am detecting and matching features of a pair of images, using a typical detector-descriptor-matcher combination and then findHomography to produce a transformation matrix. After this, I want the...

I am trying to match SIFT features between two images which I have detected using OpenCV: sift = cv2.xfeatures2d.SIFT_create() kp, desc = sift.detectAndCompute(img, None) The images both seem to c...

I would like to include xfeatures2D from opencv_contrib into opencv.js. I follow this documentation Build OpenCV.js. Everything is ok. I got a brand new opencv.js that I'm able to use in my html pa...

What is the most efficient way to find the bounding box of the largest blob in a binary image using OpenCV? Unfortunately, OpenCV does not have specific functionality for blob detection. Should I j...

Polyfill services like polyfill.io seem to be delivering only small feature detects to the browser and then lazy-load only the polyfills that are actually needed. As I understand the babel documen...

I created a Webauthn authentication for my website. Now I'm trying to create a good interface for the best user experience. My users are not techies. I'm interested in the fingerprint authentica...

I have the following code cv::initModule_nonfree(); std::vector<cv::KeyPoint> keypoints_1; cv::Ptr<cv::FeatureDetector> detector = cv::FeatureDetector::create("SURF"); cv::Mat image = ...

I'm working on a project to automatically rotate microscope image stacks of a fluid experiment so that they are lined up with images of the CAD template for the microfluidic chip. I am using the Op...

Problem So I am fairly new to Computer Vision in general. I am currently trying to calculate a homography by analyzing 2 images. I want to use the homography to correct the perspective of 1 image ...

I use the HOGDescriptor of the OpenCV C++ Lib to compute the feature vectors of an images. I would like to visualize the features in the source image. Can anyone help me?

IE10+ no longer supports browser detection tags to identify a browser. For detecting IE10 I am using JavaScript and a capability-testing technique to detect certain ms prefixed styles are defined s...

i want to measure the circularity of circles (difference of the "circles" height and width or ellipse parameters). The circles are given in pictures as shown here: After doing usual stuff like ...

I'm trying to use the ORB keypoint detector and it seems to be returning much fewer points than the SIFT detector and the FAST detector. This image shows the keypoints found by the ORB detector: ...

I'm trying to follow this tutorial with my own images.However, the results I get are not exeacty what I'd exepct. Am I missing something here, or is SIFT just not a good enough solution in this cas...

I understand that you can detect features in javascript with something like this if(xmlhttprequest){ console.log("this browser is ajax compatible"); } I also understand that ES6 imports are nati...

I am using the ORB feature detector to find matches between two images using this code: FeatureDetector detector = FeatureDetector.create(FeatureDetector.ORB); DescriptorExtractor descriptor = D...

I would like to create a tensorflow function, that replicates the euclidean distance transform of scipy for each 2-dimensional matrix in my 3-dimensional tensor. I have a 3-dimensional tensor, whe...