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- W2144763316 abstract "Lagrange multiplier selection that is widely used in mode decision has a significant effect on the quality performance of video encoding. It has been shown in the literature that the Lagrange multiplier is closely related to the quantization factor. However, changing the Lagrange multiplier based on quantization, as it has been the case in several researches, may not be totally accurate. In this paper, it has been discussed from both analytical and experimental points of view that there is always a constant Lagrange multiplier which provides a better PSNR quality compared to the conventional adaptive Lagrange multiplier. This finding is very useful in applications such as constant bitrate coding or video coding with region of interest. When coding a video with constant bitrate, there is always a constant Lambda value that provides a PSNR quality better than a video encoded at the same bitrate but with an adaptive Lagrange multiplier. The proposed method has also been tested for very low bitrate applications where region of interest coding is used. Simulation results indicate that this approach improves quality by 0.67 dB in average." @default.
- W2144763316 created "2016-06-24" @default.
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- W2144763316 date "2011-05-01" @default.
- W2144763316 modified "2023-09-27" @default.
- W2144763316 title "Lagrange multiplier selection for video coding with varying quantization" @default.
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- W2144763316 doi "https://doi.org/10.1109/ccece.2011.6030576" @default.
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