how can i find value of hue component of a pixel of image in matlab.

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sweta arya
sweta arya 2015-6-1
评论： Image Analyst 2015-6-1
how can i find value of hue component of a pixel of image in matlab.i want to find average pixel intensity in hsv plane to calculate exposure of lightness of image using function given in attachment

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回答（2 个）

Walter Roberson
Walter Roberson 2015-6-1
rgb2hsv() . But if you are looking for intensity that is more commonly calculated by rgb2gray(), or perhaps hsl coordinates would make more sense for intensity than hsv would.
Image Analyst
Image Analyst 2015-6-1
Try rgb2hsv(). See my File Exchange for a demo. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
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Image Analyst
Image Analyst 2015-6-1
"Lightness" is the L in LAB color space. It's a somewhat complicated function that you can find here. The gray in rgb2gray() is a similar weighted sum of the R, G, and B. The "v" in hsv is the value and is like L and gray, but it doesn't really depend on ALL the color channels, just the maximum one: http://www.easyrgb.com/index.php?X=MATH&H=20#text20
You say that you want the "hue component of a pixel of image in matlab...to find average pixel intensity". This doesn't make sense. Intensity is a loosely defined, non-specific term that in layman's usage doesn't line up well with the optical sciences terms. There are lots of "intensity" terms in optics that are all sort of related but different. For example the "intensity" of an image is really like a luminous energy, not intensity , and has units of energy, not intensity. For a dizzying ride down the path of optical units, see http://en.wikipedia.org/wiki/Luminous_intensity - don't worry if you get confused, even people in the optics field get confused because there are so many similar, related, but different concepts.

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