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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