How to calculate the various intensity value of different color channel of a color image? i need full code in matlab.

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Md. Motiur Rahman
Md. Motiur Rahman 2018-4-25
评论： Guillaume 2018-5-18
Dear I need to extract the following features of attached image. Please give me a solution to find out those features using matlab.
  1. highest intensity value of red channel
  2. lowest intensity value of red channel
  3. mean intensity value of red channel
  4. median intensity value of red channel.
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Guillaume
Guillaume 2018-5-18
Considering that any of these is trivial to do if you've bothered to learn the slightest bit of image processing, why can't you write the 4 lines required to achieve what you want?

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Florian Morsch
Florian Morsch 2018-4-25
编辑：Florian Morsch 2018-4-25
You can use 'imhist()' and select the color you want by choosing the correct channel, red is channel 1. You will get a value of each pixel and how often its included in the image. After that you just extract the max. value, min. value (with 'find()' ) and calculate the mean (with 'mean()' ) and median (with 'median()' ).
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Florian Morsch
Florian Morsch 2018-5-18
If you want to find the first red value here, you would have to use find like this:
firstValue = find(redhist, 1);
[row, col] = find(redhist, 1);
This will give you the first value, the row and column. For the other values you want just change the find() to your needs.

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