逐帧读取视频，并使用Matlab逐帧显示图片

Question

I am newly working with Matlab. Now, I'm doing a small project about image processing. I want to read a video frame by frame and find intensity of each frame. Help me,please

Read video code : 

** It can't use hasFrames ** error : Undefined function 'hasFrame' for input arguments of type 'VideoReader'.

Thank you very much.

Answer 1

There is no such thing as hasFrames in MATLAB for the VideoReader class.

There is a function called hasFrame in MATLAB: http://www.mathworks.com/help/matlab/ref/videoreader.hasframe.html , but it only exists as of R2014b . The documentation for R2014b was just released last week, and I prematurely said that there wasn't a function called hasFrame because I have never seen it with the VideoReader class that I am used to. I currently use R2013a . Check out this thread from MathWorks for more details: http://www.mathworks.com/matlabcentral/answers/157477-unable-to-read-and-playback-movie-file

This error is probably happening because you don't have the latest version of MATLAB. If you want to read a frame from the video file using the VideoReader class, use the readFrame function after you read in the video from file: http://www.mathworks.com/help/matlab/ref/videoreader.readframe.html . Don't use hasFrame . You can always check to see if the matrix that is returned from readFrame is empty which could symbolize whether your video has a frame available or not.

Calling readFrame will provide you a video frame where you can do your analysis. You call it each time to grab the next frame in the video.

Good luck!