who to create a ROA ratio of average filter using matlab??????????????????

hi too all the browser,

i need help.............

i now doing project that required me to find the edge of the
endocardia ultrasonic image...

i have test it with canny edge and other edge detect available inside
matlab.

but the result is not satisfied.

after i browse around internet and i found some other method to
analysis the ultrasonic image

such as ratio of average (ROA), ratio of exponential weight
average(ROEWA)... and many ohter methods...

So, the problem now is i already know the mathematical of these
method.. but how am i going to apply it using matlab???????

specification of my problem:

1. what function to use, how to imply the mathematical method that i
form in each pixel of the image? (using fspecial????)

2. now i need to perform the mathematical to each pixel, how to do?

3. how to create a mask that contain my methematical method?
.

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