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In general a list of pixels is a list with brightness values (grayvalues or in case of RGB 3 channels with brightness values, each for red, green and blue seperate), for example an image stored in a cv::Mat. This list is typically stored in an order that allows conclusions to a pixel's location.
A list of points doesn't allow direct inferences about a pixel value, but stores the location of a pixel to it's origin. If the points are stored as floats there exists a subpixel accuracy about it's location, for example by calculating the centroid of a local neighbourhood.
