morphological operations in matlab and simulink -

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i got issues concerning simulink morphological block erode. i'm using 3x3 neighborhood operation (strel('square',3) set @ function block parameters ). working fine long found object points aren't located @ image borders. if they're, outcome of block erode still contains border points of image, due erode operation should have been gone. not understanding block or what's basic mistake here? if i'm using matlab function bwmorph() eroding image, gives me desired outcome, i'm expecting.

if can't fixed, i'll have implement operation matlab function block in simulink. if so, can tell me runtime increse or decrease, i'm getting? final algorithm compiled rapid prototyping platform via simulink interface.

best regards!


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