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Accessing pixel and coordinate of an image using OpenCV

Hello everybody,an image is defined by a number of pixels in row and column direction. Is the center of the image is always (0,0) is OpenCV? Suppose for an image of size 256X256, what is the difference between each pixel in row and column direction. How can I find the difference of a particular pixel from the center of the image? I need to clarify these basic things. Thanks in advance.