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引用次数: 25
摘要
与旧的视频标准相比，H.264/AVC编解码器提供了优越的编码效率和改进的网络适应性。本文给出了对H.264/AVC编码视频进行主客观质量评价的实验结果。采用4个客观指标:峰值信噪比(PSNR)、局部平均最小信噪比(local_PSNR)、视频质量度量(VQM)和结构相似性指数(SSIM)。我们分析了几种CIF序列和比特率的客观和主观指标的结果。此外，我们还比较了H.264/AVC编码序列与MPEG-4 Part 2编解码器编码序列的结果。主观质量评价结果表明，在640 kb/s以下的码率下，H.264/AVC编解码器在客观指标的保证下取得了明显更高的视频质量。在比特率高于640 kb/s的情况下，MPEG-4 Part 2编码序列的主观质量接近H.264/AVC编码视频的质量，仅由SSIM和local_PSNR结果证实。
Subjective and objective quality evaluation of the H.264/AVC coded video
The H.264/AVC codec provides a superior coding efficiency and an improved network adaptation if compared to older video standards. In this paper we present experimental results obtained by the subjective and objective quality evaluation of the H.264/AVC coded video. Four objective metrics are used: peak signal-to-noise ratio (PSNR), minimum of locally averaged PSNR (local_PSNR), video quality metric (VQM) and structural similarity index (SSIM). We have analyzed results of objective and subjective metrics for several CIF sequences and bit rates. Also, we have compared results obtained for H.264/AVC coded sequences with those coded with MPEG-4 Part 2 codec. Results of the subjective quality evaluation show that on the bit rates below 640 kb/s the H.264/AVC codec has achieved an obviously higher video quality, ensured by the objective metrics as well. On the bit rates higher than 640 kb/s the subjective quality of sequences coded by MPEG-4 Part 2 is close to the quality of H.264/AVC coded video, confirmed only by the SSIM and local_PSNR results.
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