How to calculate the proportion value of some colors to the all color in an image

Question

lina 2015-9-10

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https://ww2.mathworks.cn/matlabcentral/answers/242145-how-to-calculate-the-proportion-value-of-some-colors-to-the-all-color-in-an-image

回答： Image Analyst 2015-9-10

Dear all,

Let say I have an image as attached. I need to calculate the ratio or proportion between pixel with blue color compare to all part of image (except the background) Could anyone help how to implement it in a matlab code?

Many thanks

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Answer 1

Steven Lord 2015-9-10

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https://ww2.mathworks.cn/matlabcentral/answers/242145-how-to-calculate-the-proportion-value-of-some-colors-to-the-all-color-in-an-image#answer_191909

First, define "blue." This may seem like a simple question, but it may not be; see John D'Errico's "fuzzycolor" submission on the File Exchange.

For example, take a look at the 9 on the side of the car. I say that to me the top of the 9 is yellow, the middle is orange, and the bottom is red. So where does the yellow-ness end and the orange-ness begin? Where is the dividing line between orange and red?