CODEWITHSUNDEEP
matlabsimulink
Pyro
Pyro

Reputation: 17

Extraction of RoI in a Video

I am working on Simulink to develop my algorithm. I have a video stream with dimensions 640x360. I am trying to extract region of interest (ROI) from each frame. However, my video turns into grayscale when I use the following code:

MATLAB Function Block which I am using for the ROI extraction:

function y = fcn(u)

%some more code

width = 639;
height = 210;
top = 150;
left = 1;
y = u(top:top+height, left:left+width);

Upvotes: 0

Views: 411

Answers (1)

ibezito
ibezito

Reputation: 5822

Solution

Change the last line as follows:

y = u(top:top+height, left:left+width,:);

Explanation

The dimensions of an RGB image are actually mxnx3. The m and n are the image height and width, and there are 3 channels: red, green and blue.

when you perform a cropping of an RGB image, it should be performed on each channel separately. You can achieve that by using my code example above.

Upvotes: 1

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