how to get the values of blue channel minus green channel of an rgb image?

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charuleelaa vanilavarasu
评论： Walter Roberson 2016-2-3
that is m=G-B this is done because soil and vegetation both have high hue as well, but these objects tend to have relative high value of green and red, respectively. So m is employed to distinguish between these objects and real shadows areas. i can get the blue channels and green channels separately.

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回答（1 个）

Image Analyst
Image Analyst 2016-2-3
" soil and vegetation both have high hue" <== Not true. A high hue value is purple. I've not seen purple soil and only occasionally purple vegetation. Vegetation will have high saturation (chroma), and soil may (red, brown) or may not (black dirt) have high saturation.
I rarely do color segmentation in RGB color space. I have several color segmentation demos in my File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 Using a different color space may make it easier.
Try the Color Thresholder App on the Apps tab of the tool ribbon.
To answer your question
m = double(greenChannel) - double(blueChannel);
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Walter Roberson
Walter Roberson 2016-2-3
By the way, purple potatoes are yummy. :-) So is purple cabbage; and purple corn makes a nice change. But Eggplant -- well, keep in mind that Eggplant is a member of the deadly Nightshade family ;-(

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