How to find the maximum pixel intensity values for given colour image ,,,please give the code???,,

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ameena begam
ameena begam 2015-6-10
评论： swetha Derangula 2017-8-8
please help me

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回答（3 个）

Image Analyst
Image Analyst 2015-6-10
A color image has three color channels: red, green, and blue. How are you defining the intensity? Of a grayscale (weighted average) version of them? Or of each by itself.
What does "find" mean to you? Do you want a list of the rows and columns where the max value lives? Or do you want a binary image where it's white/1/true at the max and black/0/false elsewhere? Or something else?
fizzah khalid
fizzah khalid 2016-6-20
plz tell the code to find the intensity at which maximum pixel count lies in histogram or channels of three colors rgbimage
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Image Analyst
Image Analyst 2016-6-26
If you have your histogram counts in an array "counts", which is for a gray image or a single color channel of a color/multispectral image, then just use find():
[counts, grayLevels] = imhist(yourImage);
lastIndex = find(counts > 0, 1, 'last')
highestGrayLevel = grayLevels(lastIndex)

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swetha Derangula
swetha Derangula 2017-8-5
how can I identify the different wavelenghts image intensity,i shared sample picture ,please give me suggestions .
  2 个评论
Walter Roberson
Walter Roberson 2017-8-5
It is not possible to measure the different wavelengths image intensity from a RGB image.
RGB cameras have three color sensors per pixel that operate most efficiently at different frequencies. However, there is a lot of overlap between the operation ranges. The individual color sensors do not record frequency directly: they record total energy received over a range that happens to peak at a particular frequency. Because of this, the sensors are completely unable to tell the difference between a particular intensity at one frequency compared to twice the intensity at a different frequency that is converted half as efficiently. The readings are always ambiguous.
There are some circumstances under which a meaningful measurement can be taken; they involve knowing several different parameters including the "color temperature" of the illuminating light.

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