Is camera response needed for HDR based upon multiple exposures ?

Hello,
In many papers it is suggested to recover first the non linear
responese f(E) of the camera prior to the blending of images with
different exposures. Given f, the inverse of f is estimated and the
mixing of the images is carried out in that domain. On the other
hand, many procedures to improve the dynamic range are based on
simple rules working on the original images without any estimtion of
f. Could somebody clarify that point ??
Haim

.

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