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How to use the Histogram function in OpenCV to track only the horizontal center line for a grayscale livefeed from a camera. I am coding

How to use the Histogram function in OpenCV to track only the horizontal center line for a grayscale livefeed from a camera.

I am coding in C++ for a project, and I need to understand how to have a Histogram function be used, just across the line from the point (0,240) to the point (640, 240), to measure the intensity value of a grayscale live feed.

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