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We can see that the filtering removed salt and pepper noise from
the original image without any blurring.
if averaging filter is applied then salt and pepper noise will
not be removed, rather a blurring effect will be
present, which is
not there. So, obivously it is not averaging filter.
Due to similar reasons, it is also not ideal low pass
filter.
Guassian low pass filter induces less blurring effect but is not
very effective at removing salt and pepper
noise.
median filter is best for removing salt and pepper noise. So, in
thhis case a median filter was used. (a)
The larger the size of the mask, the more number of pixels are
compared and median value chosen from
them to be set the pixel
value of concerned pixel. So, as the mask for a pixels grows, the
local nature of the
pixel is removed hence salt and pepper noise
will be removed more effectively. Hence it can be concluded,
if the
mask size is trippled then the image will be more smooth.
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Q: In the figure below, when the image on the left was filtered using a smoothing filter, the result was image on the
right. The filter used was one of these: 1. averaging filter; 2. Ideal lowpass filter; 3.Gaussian lowpass filter; 4. median
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Q: In the figure below, when the image on the left was filtered using a smoothing filter, the result was the image on the
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