Problem on 'bitand' method

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nayomi ranamuka
nayomi ranamuka 2011-4-7
Hi friends,
I have problem on 'bitand' method when create marker image using mask.
I2 = im2bw(I1,0.8); %%Thresholding image(Create a mask)
I2Cmp = ~ I2; %%Invert the mask
marker=bitand(1,I2Cmp); %%Create marker image
There is an error when creating marker.
??? Error using ==> bitand Inputs must be non-negative integers.
How would I apply bitand for creating a maker ????
  2 个评论
David Young
David Young 2011-4-7
Could you explain what the marker image should be? It's not clear why you would want to use bitand at all in this context, and I wonder if you need something completely different. I2 and I2Cmp are logical arrays, so there is only one bit of information per pixel anyway.
nayomi ranamuka
nayomi ranamuka 2011-4-7
Marker image is the result when apply bitand method for I1 and I2Cmp images. I want to ovelay the inverted image of I2 on I1 .
How would I apply bitand method ?

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采纳的回答

Laura Proctor
Laura Proctor 2011-4-7
I don't think that you actually need to use BITAND. I think what you would like to do is create marker that consists of all ones and zeros. To do this, just use the following code to create a logical array:
marker = I2Cmp > 0;
Then, to overlay this on I1, simply use element-wise multiplication:
Iresult = I1.*marker;
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Steve Eddins
Steve Eddins 2011-4-7
I2Cmp is already logical, so the first line of code in this answer is not necessary.

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更多回答（3 个）

Steve Eddins
Steve Eddins 2011-4-7
The general answer is to use the elementwise logical operators &, |, and ~ instead of bitand and bitor to do this sort of manipulation with binary images.
To "overlay the inverted image of I2 on I1," as you say, you would do this:
marker = I1 | ~I2;
  2 个评论
David Young
David Young 2011-4-7
Steve, I don't think I1 is logical.
Steve Eddins
Steve Eddins 2011-4-7
David, you're right, sorry.

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nayomi ranamuka
nayomi ranamuka 2011-4-7
This is my solution. marker=bitand(im2uint8(I1),im2uint8(I2Cmp));
Thanx for your answers.
Steve Eddins
Steve Eddins 2011-4-7
Here's a different kind of overlay:
Iresult = I1;
Iresult(ICmp) = 255; % assuming I1 is uint8
This version turns all the marker pixels white and leaves the others alone.

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