altering matrices

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ben
ben 2011-5-5
need some help for matrices ...
Your program should calculate new matrices where each point consists of the average of the surrounding 8 points and itself.
x11 x12 x13
x21 x22 x23
x31 x32 x33
The new value of x22 is the average of x11…x33. For simplicity, you do not need to calculate the average for the pixels on the edge. thanks

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采纳的回答

Matt Tearle
Matt Tearle 2011-5-5
convn(A,B,'same')
where A is your matrix, and B is a mask that determines the weightings of points for averaging.
doc convn
for more details
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Sean de Wolski
Sean de Wolski 2011-5-6
And to point you further in the right direction. What do you need to multiply 9 objects by before summing them to get their mean. Break down the definition of "mean".
Matt Tearle
Matt Tearle 2011-5-6
8, not 9, if you're not including the middle point itself. BTW, think of that as a special case of a weighted average (with no weighting on x22)...

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更多回答（1 个）

Oleg Komarov
Oleg Komarov 2011-5-5
If you have the Image Processing Toolbox use blockproc

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