MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guia do Utilizador descarregar pdf (Página 191)

Image Enhancement

In this exampl e, you used the Color S pa ce Conve rsion and 2-D FIR Filter

blocks to sharpen and blur an image. For m o re information on these blocks,

see the Color Space Conversion and 2-D FIR Filter block reference pages in

the Video a nd Image Processing Blockset Reference. For more information on

the

fspecial function, see the Image Proce ssing Toolbox documentation.

Removing Salt and Pepper Noise from Images

Median filtering is a common image enhancement technique for removing

salt and pepper noise. Because this filtering is less sensitive than linear

techniques to extreme changes in pixel v alues, it can remove salt and pepper

noise without significantly reducing the sharpness of an image. In this topic,

you use the Median Filter b lock to re move salt and pepper noise from an

intensity image:

1 Define an intensity image in the MATLAB workspace and add noise to it by

typing the following at the MATLAB command prompt:

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MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guia do Utilizador Página 191