头部缺失的JPEG文件碎片恢复

徐明; 黄立; 张海平; 徐建; 郑宁

doi:10.11834/jig.20130103

图像处理和编码 | 浏览量 : 0 下载量: 280 CSCD: 0

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专辑

头部缺失的JPEG文件碎片恢复
Recovery method for JPEG file fragments with missing headers
2013年18卷第1期页码：24-35
纸质出版：2013
DOI： 10.11834/jig.20130103
稿件说明：

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徐明, 黄立, 张海平, 徐建, 郑宁. 头部缺失的JPEG文件碎片恢复[J]. 中国图象图形学报, 2013,18(1):24-35. DOI： 10.11834/jig.20130103.

Xu Ming, Huang Li, Zhang Haiping, Xu Jian, Zheng Ning. Recovery method for JPEG file fragments with missing headers[J]. Journal of Image and Graphics, 2013, 18(1): 24-35. DOI： 10.11834/jig.20130103.

摘要

JPEG碎片恢复和修复一直是数字取证领域中的一个难点和热点问题

特别是在遇到JPEG文件的头部缺失或者损坏而导致其数据无法正常解码和显示时。提出一种头部缺失且无重启标记的JPEG文件碎片解码与显示问题的解决方法。首先提出了基于JPEG碎片数据的各种解码参数(哈夫曼表、图像宽度、量化表和采样因子等)的估算方法;其次对显示时出现的位置错位和颜色偏移问题提出了相应的调整算法。实验结果表明

本文方法能够正确有效地解码并显示没有头部与重启标记的JPEG文件碎片。

Abstract

Recovering the incomplete fragments of a JPEG file is a challenge in the digital forensics field

especially in the case of where JPEG header is lost or damaged. In this paper

we present a method to decode and display JPEG file fragments whose header has been lost or damaged and its data doesn't include any restart marker. First

the decoding parameters (Huffman tables

image width

quantization tables

sampling factor)are estimated based on the fragment content; second

corresponding adjustment algorithms for the display problems about mismatched positions and colors are proposed. Experiments show that the proposed method can correctly decode and display the JPEG file fragments without header and RST marker.