how to encode a low pass filter to an image

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

[KSSV]

Show us the full code...

[hasan alhussaini]

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.]

Use the filter2() or the conv2() command to apply the filter.

The mathematical operation that applies a filter is convolution, not matrix/vector multiplication.

Answer 1

[KSSV]

You can do this using blocproc. Read about blocproc.