How to use the edge function to extract a curve from the photo, and then draw this curve on the coordinate system, and finally smooth the curve.

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Wesley 2020-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/651818-how-to-use-the-edge-function-to-extract-a-curve-from-the-photo-and-then-draw-this-curve-on-the-coor

评论： Wesley 2020-11-19

image.jpeg

How to use the edge function to extract a curve from the photo, and then draw this curve on the coordinate system, and finally smooth the curve.I am very grateful to everyone for helping me solve this problem.

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KALYAN ACHARJYA 2020-11-18

Wen's comments (Image) as an answer has been deleted. Same Image in Attached.

Wesley 2020-11-18

Yes, indeed.

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KALYAN ACHARJYA 2020-11-18

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https://ww2.mathworks.cn/matlabcentral/answers/651818-how-to-use-the-edge-function-to-extract-a-curve-from-the-photo-and-then-draw-this-curve-on-the-coor#answer_548248

编辑：KALYAN ACHARJYA 2020-11-18

在 MATLAB Online 中打开

data=imbinarize(imread('image.jpeg'));
result=edge(data);
figure,imshow(result);
[r,c]=find(result==1);
figure,plot(c,r,'.');

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Wesley 2020-11-19

Unfortunately, I haven't solved this problem.

Wesley 2020-11-19

I found the source of the problem. The reason is that the MATLAB software draws the line with the point in the upper left corner as the origin, so we see the image in the opposite direction to the original image.

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