Mean filter for smoothing images in Matlab

Question

I need to test some basic image processing techniques in Matlab  I need to test and compare especially two types of filters  mean filter and median filter   To smooth image using median filtering  there is a great function medfilt2 from image processing toolbox  Is there any similar function for mean filter  Or how to use the filter2 function to create the mean filter    One of the most important things for me is to have the possibility of setting radius of the filter  I e  for median filter  if I want the  3 x 3  radius  mask   I just use  imSmoothed   medfilt2 img   3 3      I would like to achieve something similar for mean filter

User · Answer

f imread        h fspecial  average    3 3    g  imfilter f  h   imshow g

User · Answer

I see good answers have already been given  but I thought it might be nice to just give a way to perform mean filtering in MATLAB using no special functions or toolboxes  This is also very good for understanding exactly how the process works as you are required to explicitly set the  convolution kernel  The mean filter kernel is fortunately very easy   I   imread      kernel   ones 3  3    9    3x3 mean kernel J   conv2 I  kernel   same      Convolve keeping size of I   Note that for colour images you would have to apply this to each of the channels in the image

User · Answer

I   imread  peppers png    H   fspecial  average    5 5    I   imfilter I  H   imshow I    Note that filters can be applied to intensity images  2D matrices  using filter2  while on multi-dimensional images  RGB images or 3D matrices  imfilter is used   Also on Intel processors  imfilter can use the Intel Integrated Performance Primitives  IPP  library to accelerate execution

User · Answer

h   fspecial  average   n   filter2 h  img     See doc fspecial  h   fspecial  average   n  returns an averaging filter  n is a 1-by-2 vector specifying the number of rows and columns in h

User · Answer

and the convolution is defined through a multiplication in transform domain   conv2 x y    fftshift ifft2 fft2 x   fft2 y      if one channel is considered    for more channels this has to be done every channel

[matlab] Mean filter for smoothing images in Matlab

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