Method for recombining incomplete JPEG file fragmentation

A file fragmentation and file technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as discontinuity and difficult file recovery

Active Publication Date: 2012-09-19
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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  • Abstract
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Problems solved by technology

These evidences include web logs, texts, videos, images, etc. However, these electronic evidences are very easy to form fragmented files (current files are divided into multiple parts with discontinuous data, that is, files that are not stored continuously or with incomplete data, Such files are called fragmented files), and it is very difficult to recover these files without file system information

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  • Method for recombining incomplete JPEG file fragmentation
  • Method for recombining incomplete JPEG file fragmentation
  • Method for recombining incomplete JPEG file fragmentation

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Embodiment Construction

[0019] A data block refers to the smallest unit of data stored in a file system, such as a sector or an integer multiple of a sector. The specific number is related to the file system. Generally, it is the smallest unit of data allocated by the file system. For example, a data block of NTFS is a cluster. The analysis data mentioned in the present invention are all stored in the form of data blocks.

[0020] figure 1 It is an overall flowchart of the method for JPEG file fragment reorganization of the present invention, as figure 1 As shown, step S101, data preprocessing: preparatory work is required before starting to reassemble JPEG file fragments, and image processing is performed on the storage device to be investigated and analyzed. For the obtained image file, store each sector number in the sector where the data in the image file is located in the analysis database, and establish a sector analysis list.

[0021] Step S102, Fragment Selection: First, for the obtained im...

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Abstract

The invention discloses a method for recombining an incomplete JPEG file fragmentation, comprising the following steps: extracting and determining JPEG file fragmentation data on a memory medium; acquiring JPEG file header information and decoding the JPEG file fragmentation according to the JPEG file header information based on the type of the JPEG file to obtain multiple JPEG file fragmentation data blocks to be analyzed; acquiring the similarity of two data blocks according to a similarity model and connecting the adjacent data blocks according to the similarity to form a JPEG file; and judging whether the data block belongs to the current JPEG file according to the MCU difference of each data block, if not, deleting, and otherwise, maintaining, wherein the maintained multiple data blocks connected together form a complete JEPG file. By using the method, the file fragmentation can be accurately recombined into a complete JPEG file.

Description

technical field [0001] The invention relates to a method for recombining disk fragment data of a computer hard disk or other removable storage media, in particular to a method for recombining undamaged JPEG file fragments. Background technique [0002] With the continuous development of information technology, computers are more and more involved in people's daily work and life, accompanied by computer-related court cases are also constantly occurring. Therefore, this new electronic data that exists in computers, digital products, and network equipment has become one of the legal forms of evidence in litigation. These evidences include web logs, texts, videos, images, etc. However, these electronic evidences are very easy to form fragmented files (current files are divided into multiple parts with discontinuous data, that is, files that are not stored continuously or with incomplete data, Such files are called fragmented files), and it is very difficult to recover these fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 肖腾杨泽明刘宝旭
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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