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Design for Embedded Image Processing on FPGAs, 2nd Edition
book

Design for Embedded Image Processing on FPGAs, 2nd Edition

by Donald G. Bailey
August 2023
Intermediate to advanced content levelIntermediate to advanced
496 pages
23h 47m
English
Wiley
Content preview from Design for Embedded Image Processing on FPGAs, 2nd Edition

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 bold upper W is the window or local neighbourhood centred on upper I left-bracket x comma y right-bracket, as illustrated in Figure 9.1. The window can be of any shape or size, but is usually square, upper W times upper W pixels in size, with upper W 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, f left-parenthesis dot right-parenthesis, 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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Publisher Resources

ISBN: 9781119819790Purchase Link