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 .
how to obtain image boundary of an image?
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Image Analyst
2013-2-5
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
I want to perform a boundary operation by which to obtain image boundary on a gray image.
Image Analyst
2013-2-5
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
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
Yes, just string them together:
oneBoundary = [yourImage(:,1), yourImage(:,end), yourImage(1,:), yourImage(end,1)];
Cesar
2013-2-5
I got an error using the string: Error using horzcat CAT arguments dimensions are not consistent.
Image Analyst
2013-2-5
编辑：Image Analyst
2013-2-5
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
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
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
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
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.
Image Analyst
2013-2-6
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
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
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.
Image Analyst
2013-2-6
And exactly how am I supposed to find your images? tinypic.com is a big web site.
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