Region of interest in simulink

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Hi everyone! I am working on extracting road lanes from a video in simulink. Can anyone guide me how can I define my ROI in each and every frame as the location of lanes will vary in every frame.

Accepted Answer

Mariano Lizarraga
Mariano Lizarraga on 30 Aug 2012
Edited: Mariano Lizarraga on 30 Aug 2012
Assuming you already know where your ROI is, you could write an embedded MATLAB function to extract the ROI as such:
function roi = variableRoi(top, left, image)
width = 4;
height = 4;
roi = image(top:top+height, left:left+width);
The only limitation would be that the output should always be the same dimension to make the block that uses your ROI a bit easier to implement. Here is a screenshot of how I tested the above embedded MATLAB:
Mariano Lizarraga
Mariano Lizarraga on 3 Sep 2012
Sure, sorry about that. The counter is just increasing from 0 to 5 (and I add 1 to start at 1 and end at 6) and this is just to synthetically generate some moving coordinates for the ROI. Thus the top left corner of the ROI starts at (1,1) then in the next sample is at (2,2), then at (3,3) and so on. The ROI has the height and width as defined in the embedded MATLAB function. The constant contains a random matrix as a synthetic image.
Hope this helps.

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