MATLAB: Transform boundary image to 2d plan coordinates

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Hi, I need to transform some images (that represent different objects boundary line) to a curve on matlab. The images are like this

what I need to do is to "place" this curve and the area inside it in a 2d space in order to make an if cicle: if I am inside this area I have some requirements, if I am outside I have different requirements (an example would be a gps use: if I am inside an area defined by this curve and so inside some longitude and latitude limits I have three restaurants, if I am outside I have no restaurant). Can somebody help?

Best Answer

What is an "if cicle"? If you have the x,y coordinates of the boundary/perimeter/curve, then you can use inpolygon() to determine if a point is inside or not. I don't know what else to say since I don't know what it means "to place this curve and the area inside it in a 2D space" nor do I know what an "if cicle" is. Isn't the curve ALREADY in a 2D space? It's in a plane isn't it?

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MATLAB: Gridded An Irregular Area With Matlab

Please plot your original image of the irregular regions, without the spots and axes, so we can try some things.

In the meantime, see the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F

If you simply want gridlines overlaid on the image, you can do

grid on;

What do you want to do when you're near the edge of an irregular region and the 8 by 8 window would go outside the region? Do you just want a list of those pixels that do lie inside the region?

MATLAB: Centroid of convex hull

You need to get a binary image first. If you just have x,y coordinates, like you used convhull, then you need to call poly2mask(). If you have an image of non-convex objects, then you need to call bwconvhull() and it will give you an image of all objects' convex hulls. Then simply call regionprops asking for the centroid.

measurements = regionprops(binaryImage, 'Centroid');

It's a structure array. Each element of measurements is a structure with fields that represent the measurements you asked it to make, like Centroid, area, whatever.

Best Answer

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