Region of interest in simulink

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Beenish Mazhar
Beenish Mazhar 2012-8-30
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.

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Mariano Lizarraga
Mariano Lizarraga 2012-8-30
编辑：Mariano Lizarraga 2012-8-30
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)
%#codegen
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: http://skit.ch/nwed
%
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Beenish Mazhar
Beenish Mazhar 2012-9-3
编辑：Beenish Mazhar 2012-9-3
Can you kindly explain the purpose of the blocks which you have used in your model in the start (like counter limited,constant,constant1);why they are used.Can you be more explicit.
Mariano Lizarraga
Mariano Lizarraga 2012-9-3
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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