How to know a square object's orientation?

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Ingrid Lopes 2020-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/518904-how-to-know-a-square-object-s-orientation

评论： Ingrid Lopes 2020-4-18

Hello, I have to scan several images of rectangles and rotate 45º only the ones that already have a 45º rotation. I tried to find the orientation using regionprops with Orientation, but it doesn't work, for the rectangles that were diagonaly placed I found all diferent types of values like 3.5 or -4.7 to -68. Anyone know how to discover the orientation of rectangles?

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Answer 1

Image Analyst 2020-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/518904-how-to-know-a-square-object-s-orientation#answer_426786

在 MATLAB Online 中打开

Try getting the perimeter using bwboundaries() then using fitPolynomialRansac() (in the Computer Vision Toolbox) to get the equation of one of the sides.

boundaries = bwboundaries(binaryImage);

Then use regionprops() to find the centroid and bounding box

props = regionprops(binaryImage, 'BoundingBox', 'Centroid');

and crop it out and rotate it and paste it back in. I'm attaching copy and pasting image demos.

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Ingrid Lopes 2020-4-18

Hi thanks for the answer. I got it a while ago.

I used two filter, one to find lines at a 45º and the other for lines at -45º. with those i found the boundaries from the rectangles that were rotated and with an if I rotated the objets that the mask from the two filters had nnz higher than 50. It worked thank god xD

But thanks for answering me anyway =)

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