7*7 average

How can we find average of matrix, considering a 7 by 7 matrix in an image????

[Guillaume]

You'll have to be clearer about what you want. Providing an example of input and desired output really helps. What does considering a 7 by 7 matrix in an image mean?

Doesn't the mean function or the mean2 (requires image processing toolbox) function work for what you want? They work on any size matrix, including 7x7 ones.

Answer 1

[Matt J]

If you want a 7x7 sliding window, you would use convolution

out=conv2(yourImage,ones(7)/49,'valid');

If instead you want to decompose your image into non-overlapping 7x7 tiles, then I would recommend sepblockfun (Download).

out=sepblockfun(yourImage,[7,7],'mean');

[Walter Roberson]

filter2 can be used instead of conv2. There are some differences in internal optimization in some cases. conv2 flips the mask compared to filter2 .

[viswanath reddy]

i want to calculate mean for every pixel by moving the mask throughout the image starting as shown

[Matt J]

OK. But your question has already been answered (so please Accept-click).

[Guillaume]

As Matt wrote, "If you want a 7x7 sliding window, you would use convolution" and he gave you the code.