JPEG2000无线标准JPWL性能分析及应用研究

Performance Analysis of JPEG2000 Wireless Standard and Research of its Application

对JPEG2000标准第11部分即JPEG2000无线传输(JPWL)进行了系统描述和性能分析,结合实例提出了具体的应用方法:根据错误敏感度描述符提供的码流错误敏感度,利用错误保护块对码流执行头保护的基础上进行不等错误保护;在解码时利用残余错误描述符提供的码流残余错误信息进行错误隐藏。仿真结果表明,和常用方法相比,该方法能够保持码流中的重要信息,有效地纠正传输误码,显著地提高了解码能力和恢复图像的质量。

The way of application of JPEG2000 Part 11, namely JPEG2000 Wireless （JPWL）, is proposed after introducing JPEG2000 Wireless and evaluating its performance. According to the error sensitivity information provided by Error Sensitivity Descriptor （ESD）,the Error Protection Block （EPB） is applied to perform header protection and then to perform Unequal Error Protection （UEP） for the bit stream. In the process of decoding,the error concealment method is used based on the residual error information provided by Residual Error Descriptor （RED）. Experimental results show that,compared with the traditional method,the proposed method gives more protections to the important parts of the bit stream. It can not only correct transmission errors effectively,but also improve the ability of decoding and the quality of the decoded images significantly.