customized focal mean

Hello list,

I want to customized focal mean in which my concern is to replace mean value
with the matrix such as:

*2 2 2* 2
*2 1 2* 1
*1 2 4* 2
2 1 2 2

first generate the mean of 3*3 matrix and then replace with entire matrix
and it will work throughout the raster data. 
first matrix mean is 2 and  it will replace and continue.....

 2 *2 2 2*
 2 *2 2 1* 
 2 *2 2 2*

 
Please help me i will appreciate for your time and concern

Hariom singh
Research scholar IIT Roorkee




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