目的嵌入式数字视频录像机(digital video recorder,DVR)系统中的多媒体(视频/音频)数据往往是电子数据司法鉴定领域的重要证据,然而在司法鉴定实践中,DVR被意外删除、恶意删除或遭受损坏导致DVR中数据无法访问的现象屡见不鲜,这无疑使...目的嵌入式数字视频录像机(digital video recorder,DVR)系统中的多媒体(视频/音频)数据往往是电子数据司法鉴定领域的重要证据,然而在司法鉴定实践中,DVR被意外删除、恶意删除或遭受损坏导致DVR中数据无法访问的现象屡见不鲜,这无疑使得电子数据鉴定过程变得更加困难。方法结合司法鉴定工作实务,主要以存储于Micro SD卡中无法访问的DVR视频文件为例,开展了基于文件分配表(file allocation table,FAT)32文件系统和H.264相关文件格式的DVR数据恢复研究。结果通过探讨的两种方法恢复的视频文件可以正常访问,同时还可通过运行脚本文件实现DBR的自动重建。结论探讨的两种方法可有效恢复FAT32文件系统的DVR数据和H.264格式的DVR数据。此外,通过运行脚本文件自动重构DBR,可有效提高司法鉴定效率。相关鉴定技术的研究对嵌入式DVR视频的鉴定技术研究具有重要的理论研究意义和实践应用价值。展开更多
In this hard disk record system, the IDE hard disk is controlled by FPGA(Field Programmable Gate Array), and the image is recorded to file format directly. In the same time, the recorded image is real-time and lossles...In this hard disk record system, the IDE hard disk is controlled by FPGA(Field Programmable Gate Array), and the image is recorded to file format directly. In the same time, the recorded image is real-time and lossless. All of this is convenient for subsequent processing.展开更多
To overcome the traditional disadvantages, an improved FPGA-core based real-time video image acqui- sition and storage system is designed. The modular designed by Verilog programming is used for video decoding of A/D ...To overcome the traditional disadvantages, an improved FPGA-core based real-time video image acqui- sition and storage system is designed. The modular designed by Verilog programming is used for video decoding of A/D configuration, video image capturing logic control and image storage logic control modules. And IDE in- terface bard disk as storage medium and FAT32 file system as record form are used for real-time image storage. Experimental results show that the system has the advantages of strong real-time capability, high integration, powerful storage, easy expansibility and so on.展开更多
文摘In this hard disk record system, the IDE hard disk is controlled by FPGA(Field Programmable Gate Array), and the image is recorded to file format directly. In the same time, the recorded image is real-time and lossless. All of this is convenient for subsequent processing.
基金Supported by the Research Fund of Shaanxi University of Technology(SLG0619)~~
文摘To overcome the traditional disadvantages, an improved FPGA-core based real-time video image acqui- sition and storage system is designed. The modular designed by Verilog programming is used for video decoding of A/D configuration, video image capturing logic control and image storage logic control modules. And IDE in- terface bard disk as storage medium and FAT32 file system as record form are used for real-time image storage. Experimental results show that the system has the advantages of strong real-time capability, high integration, powerful storage, easy expansibility and so on.
