can anyone explain this code? this code is related to my project crowd density estimation

 for a = 1:size(video,4)     
imagesc(video(:,:,:,a));    
 axis image off   
  drawnow;
 end;

[Image Analyst]

Duplicate of https://www.mathworks.com/matlabcentral/answers/332144-can-anyone-explain-this-code-what-is-meant-by-imagesc#answer_260542

[Guillaume]

duplicate of can-anyone-explain-this-code-what-is-meant-by-imagesc

[Jan]

I've closed this question, because there is an accepted answer in the duplicate thread already. This thread will be deleted soon.

Answer 1

[Jan]

This is very basic Matlab code. Please read the Getting Started chapters of the documentation and https://matlabacademy.mathworks.com/ . It would not be efficient to explain the absolute basics in the forum, when there are very good tutorials available already.

So only for a quick start:

You code is a loop over the indices along the 4th dimension of the variable "video". This is a 4D-array and the RGB images can be accessed using video(:, :, :, frameNumber). Then the axes is set to the "image" format (upside down) and mad invisible by the 'off'. Finally drawnow gives Matlab time to perform an update of the screen. Then the "end" closes the loop and the processing proceeds in the for line.