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how to obtain image boundary of an image?

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Cesar 2013-2-5

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采纳的回答： Image Analyst

how to obtain image boundary of an image?

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Youssef Khmou 2013-2-6

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Hi Cesar, you have to specify your problem, give an example with per example "circuit.tif" so everyone can work on it instead of image taken from web .

Cesar 2013-2-6

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By example consider an image with 4 birds (bird.tif), and I want to add of of those birds to the same image which now has 5 birds. Let me know if that is clear.

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Image Analyst 2013-2-5

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You haven't explained this well enough to answer. The answer could be to use bwperim(), or bwboundaries(), or just to take the first and last row and first and last column. Are you going to explain further what you want?

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Cesar 2013-2-5

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I want to perform a boundary operation by which to obtain image boundary on a gray image.

Image Analyst 2013-2-5

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在 MATLAB Online 中打开

OK, bwboundaries() and bwperim() only work on binary images. So, just do something like this:

leftBoundary = yourImage(:, 1);
rightBoundary = yourImage(:, end);
topBoundary = yourImage(1, :);
bottomBoundary = yourImage(end, :);

Cesar 2013-2-5

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Thanks. The functions do create and display all 4 boundaries of the image. Can that also be done using only 1 function?

Image Analyst 2013-2-5

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Yes, just string them together:

oneBoundary = [yourImage(:,1), yourImage(:,end), yourImage(1,:), yourImage(end,1)];

Cesar 2013-2-5

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I got an error using the string: Error using horzcat CAT arguments dimensions are not consistent.

Image Analyst 2013-2-5

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编辑：Image Analyst 2013-2-5

在 MATLAB Online 中打开

You need to transpose two of them, because two are row vectors and two are column vectors. Use ' to transpose.

oneBoundary = [yourImage(:,1)', yourImage(:,end)', yourImage(1,:), yourImage(end,1)];

Cesar 2013-2-5

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Thanks. Makes sense.

Cesar 2013-2-5

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Another question. Imagine an image with 4 birds (bird.tif by example), how to add additional bird in the image?

Image Analyst 2013-2-5

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Get a mask for the bird, then do

birds5(binaryMask) = singleBirdImage(binaryMask);

to transfer the bird from the singleBirdImage to the birds5 image.

Cesar 2013-2-5

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img = imread('bird.tif'); IMG = imshow(img); IMG1 = imellipse(gca,[55 10 120 120]); BW = createMask(IMG1,IMG); Will that create the mask for the bird?

Image Analyst 2013-2-5

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Why don't you upload your images of the 4 birds? Where does your single bird come from? A separate image, or is it just one of the 4 that you'd like to copy somewhere else in the image? If you upload your images, then we can cut to the chase and not go back and forth lots of times.

Cesar 2013-2-6

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How do I upload the image?

Image Analyst 2013-2-6

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http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers Or try http://snag.gy or http://www.tinypic.com

Cesar 2013-2-6

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Done

Image Analyst 2013-2-6

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Uh, OK.

Cesar 2013-2-6

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Any update?

Image Analyst 2013-2-6

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On what?

Cesar 2013-2-6

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After uploading the image, do you have an answer?

Image Analyst 2013-2-6

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What image? You didn't tell me the location of any image. Please review your postings from my point of view. Does anyone have enough information to help you?

Cesar 2013-2-6

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I did upload an image at http://www.tinypic.com. Do you want me to re-upload it?

Cesar 2013-2-6

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Imagine an image with 4 objects, how to add an additional object in the image? That was my question. I uploaded an image with 4 objects at http://www.tinypic.com.

Cesar 2013-2-6