Find surrounding and outer pixels

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Ciara 2014년 4월 4일

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https://kr.mathworks.com/matlabcentral/answers/124489-find-surrounding-and-outer-pixels

댓글: sensation 2017년 2월 7일

Hi,

I have used a 16x16 window to scan an entire image in matlab. The value of the largest pixel is stored as well as its position on the image.

I need to find the pixels surrounding the largest pixels and check if they are as bright as it. I also need to find the outer pixels and check if they are darker than the largest pixel.

Could anyone tell me how to find the surrounding pixels and the outer pixels?

Thanks.

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Image Analyst 2014년 4월 4일

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https://kr.mathworks.com/matlabcentral/answers/124489-find-surrounding-and-outer-pixels#answer_132199

What do you mean by largest pixel? All pixels are the same size, aren't they? Do you mean brightest? You can find the brightest pixel in a neighborhood in two ways, depending on exactly how you define brightest: imregionalmax() and imdilate(). You can cast that image to double and subtract it from the original image to see how a pixel differs from the neighborhood.

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Image Analyst 2014년 4월 7일

Did this answer your question Ciara?

sensation 2017년 2월 7일

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Hi,

I thanks for this info. I was using part of your code to find the 3x3 neireast matrix.

And now I am tryying to find the neareast number and its id betweeen two different size arrays?

for instance, I have an array: A: 540x1 values; and another array B, 540 X 4860 consisted of 540 blocks (each one represented by 3x3 matrix-so 9X540=4860).

What I want to do is to search through each of these 9 area block numbers, compare it with single number from B and retrieve that area.

A: 45 etc X 540

B: 5 6 9

4 15 16

21 55 2

etc X 540 blocks like this;

result: would be 55 and id=8 since the counting in my code goes like:

234

516

789

for instance if I give some fix row and col: eg row=15 and col=12 I get a good result with:

[value,index]=min(abs(neighbors_area(:)-100));