Bounding Box with constraints

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Prabs 2014-3-4

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评论： Walter Roberson 2014-3-9

Need some urgent help!

I've drawn a BoundingBox over a binary image. Now, I want to draw separate BoundingBoxes for the white pixeled regions above and below a blue horizontal line, which I've plotted on the image. If not BoundingBox, please advise on other options.

Thanks

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Walter Roberson 2014-3-9

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency

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Answer 1

Image Analyst 2014-3-4

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Not sure where the confusion lies - seems really straightforward. I assume you have 2 x columns: x1 and x2. And you have 3 y rows: y1 (top), y2 (middle) and y3 (bottom). So the total bounding box is

% Upper Bounding box
bb1x = [x1 x2 x2 x1 x1];
bb1y = [y1 y1 y2 y2 y1];
% Lower bounding box
bb2x = bb1x;
bb2y = [y2 y2 y3 y3 y2];
% Outer, overall bounding box
bb3x = bb1x;
bb3y = [y1 y1 y3 y3 y1];

Now you can plot any of them

plot(bb1x, bb1y, 'r-', 'LineWidth', 3);
% or
plot(bb2x, bb2y, 'b-', 'LineWidth', 3);
% or
plot(bb3x, bb3y, 'g-', 'LineWidth', 3);

Isn't this what you were thinking of? If not, why not? Maybe I oversimplified what you were after.

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Prabs 2014-3-4

Yeh, the nagging feeling you're getting is valid. From what you've suggested, that code plots a rectangle around the whole image image above the blue line, and not just around the white border. In the end, I'm attempting to 'bound' the white pixels into a number of 'boxes' So, ideally I want the next 2 boxes to bound around only the white pixelated part. One above and one below the blue line, and so on and so forth until I can't split the boxes further. Hope that helps you understand my question.

Image Analyst 2014-3-4

Uh, not really. Except that you don't want just 2 or 3 boxes but lots and lots of them. Of course there are numerous ways to divide the whole thing up into a variety of sub-boxes. But maybe someone else will explain it also.

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