【摘要】 在视频编码中,码率控制的目的是:在满足带宽约束的条件下,提高编码图像的质量。获得符合人眼视觉特性的均匀图像质量是码率控制的一个期望目标。根据信源的线性模型,考虑图像宏块的复杂度提出一种码率控制算法,此方法对宏块的量化参数具有平滑作用,可以使宏块量化参数和失真度分布更加集中,从而具有更加均匀一致的图像质量。仿真表明,该方法可以改善图像的峰值信噪声比,获得更好的主客观视觉质量。更多还原

【Abstract】 In video coding,the purpose of rate control is to improve picture quality while subject to the bandwidth constraint.The consistent visual quality is complied with HVS,thus it is a desired goal of rate control.A new rate control scheme using linear source model as content complexity measure was proposed.This method smoothed the quantized parameter intrinsically,which made the distribution of quantized parameters and mean-squared errors more concentrated among macro blocks,so more consistent visual quality could be got.Simulation results show that the proposed method can improve PSNR as well as subjective visual quality.更多还原