Surface area of a 3D-plot from a matrix.

Question

Gabriel 2014-2-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118824-surface-area-of-a-3d-plot-from-a-matrix

编辑： Walter Roberson 2014-2-24

在 MATLAB Online 中打开

Hi guys. I'm trying to calculate the area of a surface. My problem is something like this:

I have some images in 8bits ... something like this one:

https://imageshack.com/i/mwq4zvp

I made a Java program so I can turn those images into a matrix and open it with MatLab.

When I run my program for this image it returns me something like this:

 matrix = [255,255,255,255,255;
          255,195,195,195,255;
          255,195,0,195,255;
          255,195,195,195,255;
          255,255,255,255,255];

Then I can put this matrix in matlab and use the function surf. So I get something like this:

https://imageshack.com/i/g128ybj

https://imageshack.com/i/g4x7mnj

Now comes my problem. Is there any way to calculate the surface area of this 3d-plot? Can be anything that returns me a quantitative value for this surface area.

Thanks.

ps: sorry for my english, im from Brazil.

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Answer 1

Thomas 2014-2-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/118824-surface-area-of-a-3d-plot-from-a-matrix#answer_125887

I do not think MALTAB has a built-in function. (I might be wrong though) However a similar question has been answered here http://www.mathworks.com/matlabcentral/answers/35501-surface-area-from-a-z-matrix