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36.2: Enhanced Local Pixel Compensation with Clipping Suppression and Global Luminance Preservation
Author(s) -
Schäfer Daniel,
Jung Tobias,
Xu Chihao
Publication year - 2012
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2012.tb05820.x
Subject(s) - clipping (morphology) , luminance , brightness , flicker , compensation (psychology) , pixel , computer science , computer vision , transmission (telecommunications) , artificial intelligence , optics , telecommunications , physics , computer graphics (images) , psychology , philosophy , linguistics , psychoanalysis
Clipping caused by temporal LED filter suppressing LED flicker or by high power saving is one of the most annoying effects in locally dimmed BL systems. In standard Pixel Compensation (PC) algorithms the lower BL luminance is compensated by increasing the TFT transmission by a reciprocal factor. In our new approach the compensation factor is moreover a function of the achieved BL luminance and the clipping density of a local area. This strategy leads to a reduction of clipping below a perceptual threshold while the global image brightness is mostly preserved. Thus, our SSC local dimming system amended by this new approach delivers high power saving rates and high image quality ‐ without annoying clipping artifacts.