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

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mangood UK
mangood UK 2013 年 4 月 23 日
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 2013 年 4 月 24 日
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.
  11 件のコメント
Image Analyst
Image Analyst 2013 年 5 月 24 日
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
mangood UK 2013 年 5 月 24 日
thank

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mangood UK
mangood UK 2013 年 5 月 23 日
thank you
alot
a lot
a lot
best regards

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