I want to calculate the white area of contour

2 次查看（过去 30 天）

Jeong 2012-7-23

"How can I calculate the white area of this contour?"

In my opinion, the number of white pixels corresponds to the white area I think.

If it is right, could you explain that how to count the number of white pixels.

Or do you have any other idea to calculate the area, please let me know.

thank you.

Here is m-file that creates contour.

clear;

clf;

clc;

filename = 'project.txt';

datatable = load(filename);

data = datatable(2:end,2:end);

length = datatable(1,2:end);

time = datatable(2:end,1).';

datasize=size(data);

row=datasize(1,1);

column=datasize(1,2);

row=1:row;

[c,h]=contourf(length,row',data,[20 2 30]);

colormap gray

grid on

hold on

Image Analyst 2012-7-23

I don't have your data file so I can't run your code. But it looks like a gray image with the white being 255 so the usual code for that is

whitePixels = grayImage == 255; % A logical (binary) image
numberOfWhitePixels = sum(whitePixels(:));

Image Analyst 2012-7-24

You can try export_fig - see the first page of the File Exchange. It's always the top download.

Jeong 2012-7-24

Thanks a lot!

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