MATLAB VIDEO AND IMAGE PROCESSING BLOCKSET 3 Guide de l'utilisateur Page 200

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7 Analysis and Enhancement
radians per sample. The coefficients were created using the Filter Design
and Analysis Tool (FDATool) and the
ftrans2 function.
11 Use the 2-D FIR Filter block to model a band-reject filter capable of
removing the periodic noise from the video. Set the block parameters as
follows:
Coefficients =
h
Output size = Same as input port I
Padding options = Circular
Choose a type of padding that minimizes the effect of the pixels outside the
image on the processing of the image. In this example, circular padding
produces the best results because it is most effective at replicating the
sinusoidal noise outside the image.
7-44
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