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

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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
Image Analyst on 24 Apr 2013
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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mangood UK
mangood UK on 24 May 2013
dear Image Analyst:
you replay is always perfect yes it perfect
for Optical distortion i think also affect on the center of the object or center of mass of object is this right!!!!
for the imtransform() do you any know any good tutorial i mean with som figure for what you say and for the solving this problem
best regards
Image Analyst
Image Analyst on 24 May 2013
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.

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mangood UK
mangood UK on 23 May 2013
thank you
alot
a lot
a lot
best regards

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