基于H.264跳过宏块特征的图像缩放方法

A image scaling method for H.264 sequence base on skip macro-block characteristic

智能设备的多样化,使不同设备的播放器在播放同一H.264/AVC视频时,需要针对显示器的分辨力先将解码图像进行缩放,再输出到显示器。而放大算法的复杂度往往会影响智能设备播放视频的实时性。针对这一问题,提出一种新的基于H.264/AVC视频解码图像的快速缩放方法。该方法的创新性在于将图像缩放操作和解码过程联系起来,并使缩放处理单位分解到宏块级,从而省去对特定的跳过模式宏块的缩放处理。实验表明,与传统方法相比,该方法在图像质量高度保真的情况下,对放大速度的提升可高达150%。

The diversity of smart device makes it necessary for video players to run on different device to scaling image after decoding a H. 264/AVC video, to adapt different display resolution. As the image scaling algorithm is complex, the smart device seldom can play a video stream in real time. Aim at this problem, this paper proposed a new method for scaling image of H. 264/AVC video sequence fast, by linking scaling operation with decode information, can omit scaling operation of much special skip and perform scaling in macroblock unit, there upon it mode macroblock. The experiment data show the proposed method can raise the scaling speed up to 150 percent, meanwhile, output image keeps high fidelity with which output from the traditional method.