are there any index in image processing toolbox of matlab that would represent intensity of an image?

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satish thapaliya
satish thapaliya 2012-12-25
I want to know wheter there is some functions in matlab which would describe the intensity of an image. I want to study different intensity image with some parameters like g channel and to see how the intensity result differs with different values of parameters obtained.

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回答（2 个）

Image Analyst
Image Analyst 2012-12-25
The value of the image matrix is its intensity. A color image has three color channels (usually) and each color channel has its own intensity. You can get the intensity of a single pixel, some group of pixels, or of the entire image. I'm not really sure how to answer your question because I don't know what you want to measure. There is no function that "describes" the intensity unless you mean imhist(), or mean2(), or max() or min() - that sort of thing. But I'm sure you already know about those functions.
Walter Roberson
Walter Roberson 2012-12-25
If you mean brightness, then rgb2gray()
Note: The rgb2gray() calculations are linear in each of the channels (with different coefficients for each channel), so you could use theory rather than experiments.

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