Design of image-adaptive quantization tables for JPEG
Design of image-adaptive quantization tables for JPEG
复制标题
JPEG 图像自适应量化表的设计
DOI：
10.1117/12.199459
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
K. Parker
中科院分区：
文献类型：
--
作者：
H. T. Fung;K. Parker
ISO/JPEG中基于离散余弦变换的编码方案中的率失真权衡由量化表决定。为了允许用户选择不同的质量，通常的做法是缩放已经从心理视觉实验中经验地确定的标准量化表。本文提出了一种生成量化表的算法，该表对给定的图像和给定的失真进行优化。与其他技术相比，该算法的计算复杂度有所降低。优化的图像自适应量化表
与使用标准的定标量化表相比，通常在比特率上产生15%到20%的改进。一旦为特定图像生成了优化量化表，
该算法在码率牺牲较小的情况下，也可以应用于其他内容相似的图像。
The rate-distortion trade-off in the discrete cosine transform- based coding scheme in ISO/JPEG is determined by the quantization table. To permit a different quality to be selected by a user, a common practice is to scale the standard quantization tables that have been empirically determined from psychovisual experiments. In this paper, an algorithm is presented to generate a quantization table that is optimized for a given image and for a given distortion. The computationalcomplexity of this algorithm is reduced compared to other techniques. The optimized, image-adaptive quantization table
typically yields an improvement of 15% to 20% in bit rate compared to the use of standard, scaled quantization tables. Once an optimized quantization table has been generated for a specific image,
it can also be applied to other images with similar content with a small sacrifice in bit rate.