How can I obtain an array of the xy coordinates for a curve in a picture?

Question

Grigorios Chatziandreou 2022-4-26

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https://ww2.mathworks.cn/matlabcentral/answers/1705120-how-can-i-obtain-an-array-of-the-xy-coordinates-for-a-curve-in-a-picture

回答： Precise Simulation 2022-8-30

hello, I have a picture and would like to extract information. Specifically, I want to use the Finite Element Analysis Tool (app extension) to model flow around a car. On my ipad, I have drawn a simple 2D side layout (a closed curve) and would like to gain somehow the coordinates for each point (with a small spacestep). Could you please help?

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Answer 1

Jason Shrand 2022-4-26

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If you have a picture, you can load it as a [width X height X 3] RGB image that you can then manipulate, using the "imread" function.

From there you could use the Computer Vision Toolbox to do feature detection. Specifically, I think imcontour might be useful.

https://www.mathworks.com/help/images/ref/imcontour.html

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Answer 2

Precise Simulation 2022-8-30

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When using FEATool version 1.15.1 and later your can import a bitmap image (jpeg, bmp, or png) and convert it to a two dimensional geometry (which you later can mesh and perform CFD simulations on). For example see the link below:

https://www.featool.com/doc/geom#geom_import_img