Can I extract brown lines from one image?

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Kwanghun Choi
Kwanghun Choi 2017-10-18
回答： Image Analyst 2017-10-19
Hello! :)
I have to extract brown lines from one image(=topographic map). Line are curved and RGB information is like
Red : 187 Green : 172 Blue : 158 .
How can I input that color value into matlab? And how can I extract the line?
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Cam Salzberger
Cam Salzberger 2017-10-18
What format do you want the line to be "extracted" in? Do you want a binary mask indicating the position of the line? Do you want the indices of the line pixels? Do you want the start and endpoints of the line?
Kwanghun Choi
Kwanghun Choi 2017-10-19
I want a binary mask indicating the position.

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采纳的回答

Image Analyst
Image Analyst 2017-10-19
Try this:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Find brown pixels.
mask = redChannel == 187 & greenChannel == 172 & blueChannel == 158;

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