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

[Lucynerios]

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 (or bar3). 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.

 

[pietro82]

Hope this helps

http://www.mathworks.com/matlabcentral/answers/35501-surface-area-from-a-z-matrix

cheers