Dr. Doina Petrescu Profile

Dr. Doina Petrescu

Principal Staff Engineer at Motorola Mobility LLC

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Proceedings Article | 18 February 2011 Paper

Quality and noise measurements in mobile phone video capture

Doina Petrescu, John Pincenti

Proceedings Volume 7881, 788105 (2011) https://doi.org/10.1117/12.876745

KEYWORDS: Computer programming, Video, Video compression, Image quality, Sensors, Image processing, Video processing, Cell phones, Image sensors, Interference (communication)

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The quality of videos captured with mobile phones has become increasingly important particularly since resolutions and formats have reached a level that rivals the capabilities available in the digital camcorder market, and since many mobile phones now allow direct playback on large HDTVs. The video quality is determined by the combined quality of the individual parts of the imaging system including the image sensor, the digital color processing, and the video compression, each of which has been studied independently. In this work, we study the combined effect of these elements on the overall video quality. We do this by evaluating the capture under various lighting, color processing, and video compression conditions. First, we measure full reference quality metrics between encoder input and the reconstructed sequence, where the encoder input changes with light and color processing modifications. Second, we introduce a system model which includes all elements that affect video quality, including a low light additive noise model, ISP color processing, as well as the video encoder. Our experiments show that in low light conditions and for certain choices of color processing the system level visual quality may not improve when the encoder becomes more capable or the compression ratio is reduced.

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