MATLAB: How to get the coordinates of the center of gravity of various triangles and rectangles on the image

center of gravityImage Processing Toolbox

I would like to get the center of gravity of various (size / gradient) triangles and rectangles drawn on one image. Is there any useful toolbox or functions to get it in MATLAB? In some triangles are partially out of image, only one or two angles are drawn on the image. I'd installed MATLAB last month and am a beginner, so if possible, could you please let me which toolbox/function I should use, with a sample code?

Best Answer

See my Image Segmentation Tutorial in my File Exchange. It does exactly that.

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MATLAB: Getting all points which are inside of the convexhull

Don't use image as the name of your variable because it's the name of a built-in function.

Don't use convhull(). Use bwconvhull() instead. Then do an XOR with the binary image.

MATLAB: Detect shape in image

You can't do it in one command. The best you can do is a few commands, depending on what you mean by "detect." Basically you have to measure a bunch of things and figure out which of those, in which ranges, uniquely identifies each type of shape you want to "detect." A good starting place is to computer the "circularity" which is:

allAreas = [measurements.Area];
allPerimeters = [measurements.Perimeter];
circularities = allPerimeters.^2 ./ (4*pi*allAreas);

A perfect circle is 1 and other shapes will lie in certain ranges above 1. There may be overlap of the ranges for shapes that are indeterminate, such as a triangle with bulging sides (almost rounded).

See my image segmentation tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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MATLAB: Getting all points which are inside of the convexhull

MATLAB: Detect shape in image

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