How to assign zero pixel location of one image to other

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Jim 2011-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/16475-how-to-assign-zero-pixel-location-of-one-image-to-other

Hi,

I need to assign zero pixel location of one image to the zero pixel location of other

Can anybody suggest something about this

Thanks in advance

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David Young 2011-9-22

Your question is not clear: please can you explain what you mean, perhaps with a small example of the images before and after assignment.

Jim 2011-9-22

Hi,

thank you for ur reply

I am giving a example here for clear understanding

suppose image1 having pixels like this

[1 2 0;3 0 1;0 7 5] and

image2 having pixels like this

[2 2 3;5 5 1;7 7 5]

I need to replace the pixel values with zero in image1 with the values of the same pixel location in image2

that is in row 1 of image1 0 must be replaced by 3 which is in the same pixel location in image 2

i,e after replacing image1 must become like [1 2 3;3 5 1;7 7 5]

But i have two images with size 256*256

I stored all the locations of image1 with pixel value 0 in an array

and now I need to replace the pixel values with zero in image1 with the values of the same pixel location in image2

Thanks in advance

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Answer 1

Image Analyst 2011-9-22

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https://ww2.mathworks.cn/matlabcentral/answers/16475-how-to-assign-zero-pixel-location-of-one-image-to-other#answer_22287

在 MATLAB Online 中打开

Do you mean like you want image2 to be zero in the same places that image1 is? Like this(untested):

image2(image1==0) = 0;

Please clarify.

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Jim 2011-9-22

Hi,

thank you for ur reply

I am giving a example here for clear understanding

suppose image1 having pixels like this

[1 2 0;3 0 1;0 7 5] and

image2 having pixels like this

[2 2 3;5 5 1;7 7 5]

I need to replace the pixel values with zero in image1 with the values of the same pixel location in image2

that is in row 1 of image1 0 must be replaced by 3 which is in the same pixel location in image 2

i,e after replacing image1 must become like [1 2 3;3 5 1;7 7 5]

But i have two images with size 256*256

I stored all the locations of image1 with pixel value 0 in an array

and now I need to replace the pixel values with zero in image1 with the values of the same pixel location in image2

Thanks in advance

Walter Roberson 2011-9-22

z = image1 == 0;

image1(z) = image2(z);

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Answer 2

Image Analyst 2011-9-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/16475-how-to-assign-zero-pixel-location-of-one-image-to-other#answer_22309

在 MATLAB Online 中打开

Try this:

image1 = [1 2 0;3 0 1;0 7 5]
image2 = [2 2 3;5 5 1;7 7 5] 
pixelsToReplace = image1 == 0
image1(pixelsToReplace) = image2(pixelsToReplace)

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Image Analyst 2011-9-22

You should note that I already showed you this concept in your nearly identical question: http://www.mathworks.com/matlabcentral/answers/16350-how-to-remove-pixels-in-an-image

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