How to find image's background area

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Andre Luis
Andre Luis 2015-3-18
评论： Image Analyst 2015-3-19
Hello!
I am new to image processing in Matlab. I need to find the size of the covered area (or the size of empty space) in the following image.
Is it possible?
Thanks in advance.

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回答（1 个）

Image Analyst
Image Analyst 2015-3-18
The image doesn't seem to exist. Please re-upload it.
In the meantime, see my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
  2 个评论
Andre Luis
Andre Luis 2015-3-19
Sorry, trying to re-upload.
Actually, I think I got what I wanted using im2bw and bwarea commands.
Image Analyst
Image Analyst 2015-3-19
What are you defining as "covered" or "empty"? Can you go simply by how dark it is? Like
emptySpace = grayImage < someThresholdValue;
pixelArea = sum(emptySpace); % Area in pixels.

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