GA/T 2000.248-2019 in English

VALID

Information codes for public security industry—Part 248:Coding rules for basic object identity for video and image information

Issued on:2019-08-28
Implemented on:2019-10-01
File Format:PDF
Delivery:Via email within 1~3 business days

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Standard No:	GA/T 2000.248-2019
Document status:	VALID
Title in English:	Information codes for public security industry—Part 248:Coding rules for basic object identity for video and image information
Title in Chinese:	公安信息代码第248部分：视频图像信息基本对象标识编码规则
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2019-08-28
Implemented on:	2019-10-01
ICS Classification:	35.040-Character sets and information coding
Chinese Classification:	A90-Social and public safety in general
Professional Classification:	GA-Security
Related Keywords:	21-22 bits object type coding rules public security industry part basic object identity image information introduction analysis
Related Topics:	video encoding information image object image information Public security information code Public Security Information Code Part 32 Public security information code Public Security Information Code Part 22 image information Public security information code 45 Public Security Information 28 Industry standard public security information code Public security information ga/t1012-2019 ga/t49-2019

本部分规定了视频图像信息基本对象标识的编码规则。
本部分适用于公安信息化建设以及信息的处理与管理。

Introduction

Analysis of standard technical framework

As the 248th part of GA/T 2000 series, this standard constructs a composite coding system consisting of 4 layers and 41 bits:

Layer	Number of bits	Coded content	Specification basis
Layer 1	1-20 bits	Device code	Appendix D of GB/T 28181-2016
Layer 2	21-22 bits	Object type (01 video/02 image/03 file)	Clause 3.b of this standard
Layer 3	23-36 bits	Timestamp (YYYYMMDDhhmmss)	Clause 3.c of this standard
Layer 4	37-41 bits	Serial number (starting from 00001)	Clause 3.d of this standard

Key technology implementation

1. Equipment coding compatibility design

The first layer of coding directly quotes the equipment coding rules of GB/T 28181 standard to ensure seamless connection with existing video surveillance systems. Typical application scenarios include:

Unique identification of devices when cross-regional video surveillance is connected to the Internet
Unified management of multi-vendor devices in the Xueliang Project

2. Time coding accuracy optimization

14-bit timestamp is accurate to the second level, supporting:

Hikvision's video analysis platform can achieve millisecond-level time alignment through this encoding when processing more than 100,000 concurrent video streams.

Implementation Suggestions

Transition between old and new systems: It is recommended to use encoding conversion middleware to achieve historical data migration
Database design: The 41-bit code should be disassembled and stored to improve indexing efficiency
Verification mechanism: The second-level type code legitimacy verification (01-03,99) needs to be added