This section is related to Convolutional Neural Networks CNN. These filters are also known as a kernel - a function that can change the original image.
Image processing - blurring filter: for each pixel, take a weighted pixel average of the pixels around it.
Image processing - edge detection, contrast: take differences of the pixels, detect horizontal lines or vertical lines by taking differences using positive and negative numbers.
There are other kernels that take variation of averages pixels.
One famous filter is called Sobel Filter
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