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Definition of "gain compensation" |
this deals with the assumption in motion estimation in interframe coding that illumination is spatially and temporally uniform. Under these assumptions, the monochrome intensities b(zt) and b(zt −τ) of two consecutive frames are related by b(zt) and b(z − D, t − τ )where τ is the time between two frames, D is the two dimensional translation vector. Often this assumption about uniform illumination is not correct. In some situations, a multiplicative factor called gain is used to change the intensity. This is called gain compensation. This results in estimating D using gradient-type algorithms to minimize the square of the prediction error. |
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