Camera object detection on arduino?

Using Arduino Project Guidance
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I have wired an OV7670 camera module to an arduino UNO with this code and wiring. I can see the images in the provided java app on my pc, it works as expected. How could I get pixel coordinates and their RGB color in an array so that I can scan for a simple colored object in the image? Prefferably I would like to do this without being connected to the PC. When I save the 320x240 rgb PNG image files to my computer through the Java program they are about 30-40kB. I was thinking maybe to process it in pieces because the arduino doesn't have a lot of memory? Such as dividing the image in a grid and scanning one square at a time for the object. Could that work? Any help appreciated.

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Letters recognition Using Arduino and OV7670 - Using Arduino / Project Guidance - Arduino Forum

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