Top "Vision" questions

What is the mAP metric and how is it calculated?

In computer vision and object detection, the common evaluation method is mAP. What is it and how is it calculated?

machine-learning computer-vision detection metrics vision

Estimate Brightness of an image Opencv

I have been trying to obtain the image brightness in Opencv, and so far I have used calcHist and considered …

image-processing opencv computer-vision vision

Retrieving the current frame number in OpenCV

How can I retrieve the current frame number of a video using OpenCV? Does OpenCV have any built-in function for …

c++ opencv frame vision

Is it possible to run opencv (python binding) from a virtualenv?

I would like to keep everything contained within the virtualenv. Is this possible with OpenCV? I'm fine with building from …

python opencv virtualenv vision

Opencv cv2.absdiff(img1, img2).sum() without temporary img

Is it possible to calculate cv2.absdiff(img1, img2).sum() without temporary img ? I have a video stream and I …

python opencv vision

Calculate distance (disparity) OpenCV

-- Update 2 -- The following article is really useful (although it is using Python instead of C++) if you are …

opencv distance vision stereoscopy disparity-mapping

OpenCV with stereo 3D reconstruction

Say I plan to use OpenCV for 3D reconstruction using a stereo approach...and I do not have any special …

opencv 3d vision 3d-reconstruction

Is number recognition on iPhone possible in real-time?

I need to recognise numbers from the camera image on iPhone, in real-time. I know there will be no more …

iphone ocr tesseract vision

Detect table with OpenCV

I often work with scanned papers. The papers contain tables (similar to Excel tables) which I need to type into …

opencv computer-vision vision

Bilateral filter

How do I implement a bilateral filter, given a gaussian filter?

algorithm vision