Filtering is a general notion of transforming the image intensities in some
way so as to enhance or deemphasize certain features
Image Spatial Filtering
Filtering in the Domain of Image Space (Spatial
Domain)
The mask is placed over the source image, mask
elements are multiplied by pixel values, and the results
added to form an output pixel.
• The convolution kernel is normally referred to as the ‘filter’, since it
dictates what elements of the input image are allowed to pass
through to the output image.
• By choosing an appropriate filter, we can enhance certain aspects
of the output and attenuate others.