Can I extract brown lines from one image?

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Kwanghun Choi 2017-10-18

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回答： Image Analyst 2017-10-19

采纳的回答： Image Analyst

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 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 2017-10-19

I want a binary mask indicating the position.

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Image Analyst 2017-10-19

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https://ww2.mathworks.cn/matlabcentral/answers/361890-can-i-extract-brown-lines-from-one-image#answer_286539

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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;