August 2023
Intermediate to advanced
496 pages
23h 47m
English
Content preview from Design for Embedded Image Processing on FPGAs, 2nd Edition
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9Local Filters
Local filters extend point operations by having the output be some function of the pixel values within a local neighbourhood or window:
where 
is the window or local neighbourhood centred on 
, as illustrated in Figure 9.1. The window can be of any shape or size, but is usually square, 
pixels in size, with 
odd, so that the window centre is well defined. As the window is scanned through the input image, each possible position generates an output pixel according to Eq. (9.1). The filter function, 
, determines the type of filter. Since the output depends not only on the input pixel but also its local context, filters can be used for noise removal or reduction, edge detection, edge enhancement, line detection, and feature detection.
9.1 Window Caching
The software approach to filtering has both the input and output images stored in frame buffers. For each output pixel, ...
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