Jugurtha
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How do you formulate the linear least-squares method for radiometric calibration?
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This is a Penalized Least Squares problem, with penalty on the second derivative of $g()$ (so we are not saying that the function is linear). In practice you have one unknown parameter for each pixel ...

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efficient mean of solving constrained OLS problems?
1 votes

You can do it by Restricted Least Squares. If your constraints on $k$ are linear you should even have a closed form solution for $\hat{k}$.

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