Input matrix must be two dimensional

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med-sweng
med-sweng 2014-11-24
评论： HumanOptics AG 2018-6-19
I'm trying to use the code here .
As you can see, the demo sets the points as follows:
A set of points
x = [1 2 5 7 9 6 3 8;
7 6 8 7 5 7 2 4];
Instead of those points, I wanted to use a 2D image. Thus, I have set
x as follows:
x = imread('xyz.png');
When I try to run the demo, I get the following:
Error using fitellipse>parseinputs (line 321)
Input matrix must be two dimensional
Error in fitellipse (line 81)
[x, params] = parseinputs(x, params, varargin{:});
Error in test_main (line 8)
[z, a, b, alpha] = fitellipse(x, 'linear');
Why is that?
Thanks.

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回答（1 个）

Image Analyst
Image Analyst 2014-11-24
fitellipse probably expects an N rows by 2 column list of x,y coordinates. The badly-named x is probably a grayscale or color image, and from the sounds of the error message I'd bet it's a 3D array - a color image of dimensions rows-by-columns-by-3 color channels. You need to pass it the x,y coordinates of the points you want to fit an ellipse to, not an entire image.
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Image Analyst
Image Analyst 2014-11-24
Yes I do. I have the perfect paper for you: http://www.ecse.rpi.edu/homepages/qji/Papers/ellipse_det_icpr02.pdf. But no, I don't have MATLAB code for it, nor have I studied the algorithm so I can't help you with it. You can try contacting the authors.

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