I want to load a video and extract frames from it, save them and then use rgb2gray, edge detection and matching on specific frames...what will be the MATLAB commands for it??

VideoReader

Answer 1

[Florian Morsch]

To load a video: videoFileReader = vision.VideoFileReader('Video.avi');

Take a frame from the video: videoFrame = step(videoFileReader);

RGB to gray: videoFrameGray = rgb2gray(videoFrame);

Edge detection (canny or sobel): sobelEdge = edge(image,'sobel'); cannyEdge = edge(image,'canny');

For matching you have to set the features yourself and then check the frames you want for the features.

[SURILA GUGLANI]

Is this only for one frame?? Or will it work for Different frames altogether?

[Florian Morsch]

If you use

videoFrame = step(videoFileReader);

thats only for one frame. If you want it for multiple frames you can use a while-loop with a condition. For example you can create a while-loop which runs as long as you video is playing. When the video is finished, the loop ends, like this:

while ~isDone(videoFileReader)
% Do something
end

Also dont forget to release the file reader and if you display it, also the video player.

Answer 2

[Image Analyst]

See my attached demo.

Answer 3

[SURILA GUGLANI]

Thank you.