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how to encode a low pass filter to an image

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hasan alhussaini
hasan alhussaini 2017-10-17
编辑： Christoph F. 2017-10-17
Hi, I'm quite new to Matlab. im trying to write an encoded code to filter an image. i'm using the following filter code. filter = 1/9 * [1 1 1; 1 1 1; 1 1 1];
i get the message "matrix dimensions must agree", how would you go about filtering a whole image? do i have to loop it somehow? thanks
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hasan alhussaini
hasan alhussaini 2017-10-17
编辑：KSSV 2017-10-17
image=checkerboard(100);
filter = 1/9 * [1 1 1; 1 1 1; 1 1 1];
filteredboard= image*filter
(my question is, how would you go about using the above filter on a image. in other words, would i have to loop it or somesort?)
Christoph F.
Christoph F. 2017-10-17
编辑：Christoph F. 2017-10-17
Use the filter2() or the conv2() command to apply the filter.
The mathematical operation that applies a filter is convolution, not matrix/vector multiplication.

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KSSV
KSSV 2017-10-17
You can do this using blocproc. Read about blocproc.

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