Top "Feature-detection" questions

Feature detection is a process in computer vision that aims to find visual features within the image with particular desirable properties.

opencv 3, blobdetection, The function/feature is not implemented () in detectAndCompute

I have a problem with opencv 3: I want to use a feature detector, SimpleBlobDetector, about to use filters by convexity …

c++ opencv blob feature-detection
How to get pixel coordinates from Feature Matching in OpenCV Python

I need to get the list of the x and y coordinates of the pixels that the feature matcher selects …

python opencv image-processing matching feature-detection
Detect touching/overlapping circles/ellipses with OpenCV and Python

i want to measure the circularity of circles (difference of the "circles" height and width or ellipse parameters). The circles …

python opencv image-processing feature-detection hough-transform
The pro and con of BRIEF and ORB compared to SIFT

I am doing some research in Local Feature representation, so SIFT, SURF and such. Now, has anybody here ever tried …

computer-vision sift feature-detection
OpenCV - SURF Hessian minimum threshold

I'm working on a OpenCV project using surf to detect feature from images. The detector is initialized in this way …

c++ opencv feature-detection surf hessian-matrix
OpenCV 3.0.0 SurfFeatureDetector and SurfDescriptorExtractor Errors

I am attempting to implement the OpenCV 3.0.0 SURF Feature Description and Detection but after running the sample code on the …

c++ opencv feature-detection feature-extraction surf
What does size and response exactly represent in a SURF keypoint?

I'm using OpenCV 2.3 for keypoints detection and matching. But I am a bit confused with the size and response parameters …

opencv feature-detection surf template-matching video-tracking
What does the distance attribute in DMatches mean?

I have a short question: When I do feature-matching in OpenCV, what does the distance attribute mean of DMatches in …

opencv feature-detection feature-extraction
How to find the corners of a Rect object in openCV?

I am using openCV library on the android platform. I have successfully detected the largest rectangle from the image but …

android algorithm opencv image-processing feature-detection
DLIB : Training Shape_predictor for 194 landmarks (helen dataset)

I am training DLIB's shape_predictor for 194 face landmarks using helen dataset which is used to detect face landmarks through …

c++ feature-detection training-data dlib