Recovering the camera response
Method 1
•Carefully model every step in the pipeline
–measure aperture, model film, digitizer, etc.
–this is *really* hard to get right
Method 2
•Calibrate (estimate) the response function
–Image several objects with known radiance
–Measure the pixel values
–Fit a function
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–Find the inverse:           maps pixel intensity to radiance
radiance
pixel intensity
=               
response curve