Generally, the rate distortion model is employed to compute quantization parameter for the controlling bit rate. 通常码率控制算法使用一定的率失真模型来决策量化参数(QP)从而控制码率。
Quantization Parameter(QP) ( QP ) is an important parameter for the encoding process; this parameter setting determines the image coding quality. 量化参数(QP)(QP)是编码过程的一个重要参数,这个参数的设定决定了图像的编码质量。
In the designed method, the influence of image complexity on quantization parameter determination is taken into account, and an image complexity metric based on Sobel operator is presented. Furthermore, the relationship between the model parameter and the image complexity is studied. 在该方案中,考虑了图像复杂度对确定编码参数的影响,研究了一种利用Sobel算子衡量图像复杂度的方法,并进一步研究确定了该方案模型参数与图像复杂度之间的关系。
So, this paper analyzes the impact of scene changing to the video quality and the bit rate, and combined with the new initial quantization parameter algorithm this paper brings a new rate control algorithm applied to scene change forward. 为此,本文首先分析了场景切换对视频质量和码率造成的影响,并结合初始量化参数(QP)的改进算法,提出了一种应用于场景切换的码率控制算法。
This paper presents the following improvements for these deficiencies : Put forward a selection algorithm of initial quantization parameter based on bpp and the complexity of I-frame. 对此,本文作了如下改进:提出了基于bpp和I帧复杂的初始量化参数(QP)的选取算法。