altering matrices
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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
采纳的回答
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
5 个评论
Sean de Wolski
2011-5-5
or conv2 for this case
ben
2011-5-6
Matt Tearle
2011-5-6
ones (plus appropriate modifications)
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
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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Oleg Komarov
2011-5-5
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