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引用次数: 27
摘要
提出了一种适用于新出现的高效视频编码(High Efficiency Video Coding, HEVC)标准的帧级自适应速率控制方案，该方案提供了速率模型和失真模型。在速率建模方面，提出了一种基于先前编码帧的加权复杂度估计的速率模型。对于失真建模，将失真建模为绝对变换差(SATD)和当前帧的量化参数之和的指数函数。此外，提出了一种基于失真模型的质量平滑方法来减小质量波动。提出的速率控制算法在HM5.0中实现。与现有的编码技术相比，该方案的编码增益分别为0.64dB、0.33dB、0.31dB、0.42dB、0.44dB，其中LB HE和LB LC的编码增益分别为0.33dB、0.31dB、0.42dB和0.44dB。
Adaptive rate control for High Efficiency Video Coding
A frame level adaptive rate control scheme for the emerging High Efficiency Video Coding (HEVC) standard is proposed in this paper, where both rate model and distortion model are provided. For rate modeling, a new rate model is proposed based on the weighted complexity estimation of the previously encoded frames. For distortion modeling, the distortion is modeled as an exponential function of the sum of absolute transformed difference (SATD) and the quantization parameter of the current frame. Moreover, a quality smoothing method based on the distortion model is proposed to reduce the quality fluctuation. The proposed rate control algorithm is implemented into HM5.0. The proposed scheme can control the bitrate accurately with smoothing quality, and the coding gain compared with state-of-the-art technique is up to 0.64dB for LB HE & LB LC, 0.33dB, 0.31dB, 0.42dB, 0.44dB for LP HE, LP LC, RA HE and RA LC respectively.
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