Image cropping on EVM DM6437

I think some clarification of your goal is needed. 

When you say "crop" your composite image back into the original, does that mean you want to display the original image with a smaller window that contains your composite image superimposed over it using the VPBE, OR do you want to actually do this in memory OR am I missing your intent entirely?

When I hear crop in an image context, I think taking a subset of the original image, not combining images.

My input image is a combined image as shown in the attached picture. I would like to extract a subset of the original image i.e. CIF image 1.

Hope this explains! And, thanks for your email.

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Ok, to complete my original question:

Do you want to only display the selected subset through the video output, or do you need to extract it by itself into memory for processing or saving?

I need this subset image in the memory for processing. thanks!

I think you are out of luck on the video driver doing this, at least with anything straightforward.  You could extract an image sub-block using something like the resizer and just keep the resize ratio at 1:1 if that would work.  This assumes your image is in Yuv 4:2:2 format.

If there was ever a use case for the dma, this is it.  With that said, I don't know what the state of the edma lockup problem is.  I have only used the edma for external -> internal memory movement.

The resizer sounds a much better option. Do you know how to configure the resizer to work on subset of the input image?

Thanks!

I haven't used the TI resizer driver, I rolled my own so that I could use it "on the fly" with input from the CCDC, which the TI driver does not support.  I assume that TI has some documentation for their resizer driver somewhere or another.