Is there any way to do an operator on a specific region

Question

sara 2014-9-30

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回答： Iain 2014-9-30

Is there any way to do an operator on a specific region ?? for example I want to do imfill just on the Lower left quadrant of the page... I search and find blockproce but I could not do this for Lower left quadrant of the page??? thanks

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Answer 1

Mohammad Abouali 2014-9-30

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Something like this would work.

[r,c]=size(BWImage);
rHalf=round(r/2);
cHalf=round(c/2);
lowerLeftQuadrant=BWImage(rHalf:r,1:cHalf);
lowerLeftQuadrant=imfill(lowerLeftQuadrant);
BWImage(rHalf:r,1:cHalf)= lowerLeftQuadrant;

Note that You can make the code shorter by replacing the last three lines of code as follow:

BWImage(rHalf:r,1:cHalf)= imfill( BWImage(rHalf:r,1:cHalf) );

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Answer 2

Anand 2014-9-30

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What you're looking for is the roifilt2 function.

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Answer 3

Iain 2014-9-30

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A simple way is to simply chop it off:

 % (Tune the numbers for what you need)
 LowerLeftquad = my_image(74:end,1:30); % assuming a single frame of black & white.
 LowerLeftquad = my_image(74:end,1:30,:); % assuming a single colour frame or many black & white.

Do what you want:

LowerLeftquad = imfill(LowerLeftquad);

And stick it back:

my_image(74:end,1:30) = LowerLeftquad;