Spatial filtering term is the filtering operations that are performed directly on the pixels of an image. The process consists simply of moving the filter mask from point to point in an image. At each point (x,y) the response of the filter at that point is calculated using a predefined relationship. (reference from Google Doc)
There are two main types of filtering applied to images:
- Spatial domain filtering
- Frequency domain filtering
To give further ideas on how spatial filtering is applied to an image, the following MATLAB code was written by Nova Scheidt:
For you to apply the filter to the MATLAB code above, the following calls are made:
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