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I帧QP设置算法及其在场景变换中的应用

DOI: 10.13190/jbupt.200806.99.wanghy, PP. 99-103

Keywords: 码率控制,梯度,场景变换

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Abstract:

针对H.264标准,提出一种改进的I帧QP设置算法,以梯度算子来衡量I帧编码复杂度,并由此得到I帧的码率-量化(R-QP)模型.仿真结果表明,改进算法在峰值信噪比(PSNR)性能和码率控制的准确度上均有所提高,能获得更为平滑的PSNR曲线图和视觉质量.将此算法应用于场景变换时,跳帧数目大幅度减少,视频质量得到进一步提高.

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