PNG图像编解码器低码率传输差错控制系统设计

Design of Low Bit Rate Transmission Error Control System for PNG Image Codec

摘要:

色域水平过于集中会导致主机元件错误取样图像信息,从而造成图像信息的错误传输问题。为避免上述情况的发生,设计PNG图像编解码器低码率传输差错控制系统。对PNG图像传输差错控制系统的硬件模块进行设计,并考虑到在低带宽或高传输时延的网络环境下,源图像的码率可能不适合被传输模块处理和传输。因此在编解码器架构体系中,利用已生成图像信息编解码训练集中的数据参量,定义码率重构函数,实现对图像编解码器的码率重构处理。并在此基础上,通过PNG图像块拼接以及图像信息的平均绝对误差损失计算,确定传输差错控制参量的取值范围,由此完成PNG图像编解码器低码率传输差错控制系统的设计。实验结果表明,本文所设计系统可使PNG图像的色域分散程度最大值达到95.5%,不会因色域水平过于集中而导致主机元件错误取样图像信息的问题,能够实现对图像信息传输差错的有效控制。

Abstract:

Excessive concentration of color gamut levels can lead to incorrect sampling of image information by host components, resulting in incorrect transmission of image information. To avoid the occurrence of the above situation, a low bit rate transmission error control system for PNG image codecs is designed. Design the hardware module of the PNG image transmission error control system, taking into account that in low bandwidth or high transmission delay network environments, the bit rate of the source image may not be suitable for processing and transmission by the transmission module. Therefore, in the encoder decoder architecture system, the data parameters in the generated image information encoder decoder training set are used to define a rate reconstruction function and achieve rate reconstruction processing of the image encoder decoder. On this basis, the range of transmission error control parameters is determined by combining PNG image blocks and calculating the average absolute error loss of image information, thereby completing the design of a low bit rate transmission error control system for PNG image codecs. The experimental results show that the system designed in this article can achieve a maximum color gamut dispersion of 95.5% in PNG images, without the problem of incorrect sampling of image information by host components due to excessive concentration of color gamut levels. It can effectively control image information transmission errors.