I understand you want to first select the Region of Interest(ROI) from a video and then extract RGB values from the selected ROI.
The first step would be to split the videos into frames and then select the region of interest using the “drawrectangle” function in each of the frames.
You can refer to following MATLAB documentation link for more details about “drawrectangle” function-
As the second step, you can use the “imcrop” function to crop the selected ROI from the frames.
You can refer to following MATLAB documentation link for more details about “imcrop” function-
To extract the RGB values from the selected ROI, the steps are as follows-
The imread function will read any image :
A = imread('myimage.jpg');
Then for the RGB values you can use the sample code below:
R = A(:,:,1);
G = A(:,:,2);
B = A(:,:,3);
The red layer R is the first slice, blue B is the second slice, and green G is the third slice.
