Saturday, January 21, 2017

Examples of linear convolutional filters

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Mean filter

The sharpening filter perhaps needs a bit explanation. Suppose the pixel under the center of the filter has value , while all the pixels around have value , then after filtering:

Obviously, when the difference between the pixel and its environment is zero, the filter will not have any effect, but when there is a difference, it’s amplified by a factor of . Therefore this is called a sharpening filter.


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