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.

ORB is not detecting keyPoints in opencv 2.4.9

I'm trying to detect keypoints with ORB everything is fine until I switched to Opencv 2.4.9. Firts, it seems that the …

c++ opencv feature-detection orb
Android - Face feature detection

Currently I'm working on an app for Android phones. We want to detect features of a face. The programm should …

android opencv computer-vision face-detection feature-detection
OpenCV: Detect blinking lights in a video feed

I have a video feed. This video feed contains several lights blinking at different rates. All lights are the same …

opencv computer-vision feature-detection
how to improve orb feature matching?

I am trying to register two binary images. I used opencv orb detector and matcher to generate and match feature …

c++ opencv feature-detection surf orb
What is `query` and `train` in openCV features2D

Everywhere in features2D classes I see terms query and train. For example matches have trainIdx and queryIdx, and Matchers …

c++ opencv feature-detection
Peak Detection in Python: How does the scipy.signal.find_peaks_cwt function work?

I'm looking to identify some peaks in some spectrograph data, and was trying to use the scipy.signal.find_peaks_…

python numpy scipy signal-processing feature-detection
How to train a Support Vector Machine(svm) classifier with openCV with facial features?

I want to use the svm classifier for facial expression detection. I know opencv has a svm api, but I …

c opencv svm face-detection feature-detection
Feature detection with patent-free descriptors

I need the feature detection algorithm. I'm fed up surfing on the web finding nothing but SURF example and hints …

algorithm opencv image-recognition feature-detection opencv3.0
Difference between cv2.NORM_L2 and cv2.NORM_L1 in opencv python

I am using sift algorithm from python extra modules for some feature matching. Although one thing I did not understand …

python opencv feature-detection
Nesting CSS @supports and @media queries

I have been trying to figure out whether it's possible to nest CSS feature queries (also known as “CSS @supports”) …

css media-queries feature-detection