transfer function of camera !!!!!!!!!!!!! what is this

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mangood UK 2013-4-23

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采纳的回答： Image Analyst

hi today i here about what is called a transfer function of camera

its matrix with 8 unknown parameter

can any help about what is this!!!???

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Image Analyst 2013-4-24

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You'd have to give more info. Usually I think transfer function refers to the plot of output gray level versus input gray level, often called "gamma" or the opto-electronic conversion function. Basically it's a curve that usually expands (brightens) dark parts of the photo while compressing brighter parts of the photo. See the Gamma FAQ here: http://www.poynton.com/ Poynton also has a color FAQ here: http://www.poynton.com/ColorFAQ.html for those who are interested. But I've never heard of the gamma being a matrix with 8 unknown parameters. I've heard of it as a 256 by 1 lookup table. The index into the table is the input gray level and the value of the table at that element is the gray level the output image will be mapped to. Go here: http://www.image-engineering.de/ for tools for measuring the gamma of cameras.

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Image Analyst 2013-5-24

Since distortion redistributes the light, it could affect the location of the center of mass, and the intensity in the scene. The help has some examples for imtransform, though not for distortion. It wouldn't be too hard to make one for distortion. Give it a try.

mangood UK 2013-5-24