I have a raspberry pi pico and OV7670 cam. I want to connect them and get a camera output as a video, So I can use image recognition to identify objects (tennis balls) to collect them using a setup with motor drive+motor setup. Please help with your ideas and reference links. Thanks in advance.
You can use the RPI pico C sdk to write firmware code for reading image data pins of off ov7670. This explains how to setup the PCIO C SDK https://datasheets.raspberrypi.com/pico/getting-started-with-pico.pdf
Look at the ov7670 schematic here to figure out the ov7670 hookup/wiring to PICO http://web.mit.edu/6.111/www/f2016/tools/OV7670_2006.pdf
You'd realize that PICO's GPIO sampling rate is slower than ov7670 data rate. You might be able to do something to compensate for the data rate mismatch, maybe only read a few selective lines every frame. Might not work for video, but maybe stills, or video in grayscale on a lower resolution might work.
Let me know if you need more help!
Wiring tutorial in this link that shows how to wire the camera module to a pi pico and it provides a python code example for several camera models including ov7670:
Two (untested) c++ repositories that can be used as drivers/code samples:
You will have to dig into the code of whichever repository you choose in order to figure out or modify the pin connections and have it match the actual wiring.