fspecial (disk)

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Shohreh Kr
Shohreh Kr 2017-5-11
评论： Jan 2017-5-11
Hello everyone,
I have employed fspecial several times for the exercises of image processing course (h=special('disk',5);). But I have no idea how disk filter function works. Maybe sounds silly but I really appreciate if someone at least explains the big picture behind it.
Thanks in advance for your responses!

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回答（1 个）

Jan
Jan 2017-5-11
We can assume, that you have read the documentation already:
doc fspecial
The term "Circular averaging filter (pillbox)" sounds very descritpive: The average over a circular shape is calculated. What exactly is not clear about this?
  2 个评论
Shohreh Kr
Shohreh Kr 2017-5-11
Thanks! but how circular averaging works on an image?
Jan
Jan 2017-5-11
The value of each pixel is replaced by the mean of the values of all pixels inside a circle around this pixel.
What do you want to know exactly? How the circular mask is applied? How averaging RGB values work? If this is performed by 2 loops or vectorized? What the opical effect is?

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