GB/T 38892-2020 PDF English
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GB/T 38892-2020: On-board Driving Video Recording System---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38892-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
On-board Driving Video Recording System
Issued on. JUNE 2, 2020
Implemented on. DECEMBER 1, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 5
4 Abbreviations and Symbols... 7
5 Requirements... 8
6 Test Methods... 23
Appendix A (informative) Durability Test... 38
Appendix B (informative) Durability Test Calculation Model... 40
Appendix C (informative) Dynamic Image Quality Evaluation... 45
1 Scope
This Standard stipulates the requirements and test methods for on-board driving video
recording system.
This Standard is applicable to on-board driving video recording system (hereinafter
referred to as the system) for Type-M1 vehicles. The systems for other types of vehicles
may take this Standard as a reference.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 1865-2009 Paints and Varnishes - Artificial Weathering and Exposure to Artificial
Radiation - Exposure to Filtered Xenon-arc Radiation
GB/T 18655-2018 Vehicles, Boats and Internal Combustion Engines - Radio
Disturbance Characteristics - Limits and Methods of Measurement for the Protection
of On-board Receivers
GB/T 19951-2019 Road Vehicles - Disturbances Test Methods for Electrical /
Electronic Component from Electrostatic Discharge
GB/T 21437.2-2008 Road Vehicles - Electrical Disturbances from Conduction and
Coupling - Part 2.Electrical Transient Conduction along Supply Lines Only
GB/T 21437.3-2012 Road Vehicles - Electrical Disturbances from Conduction and
Coupling - Part 3.Electrical Transient Transmission by Capacitive and Inductive
Coupling via Lines Other Than Supply Lines
GB/T 28046.2-2019 Road Vehicles - Environmental Conditions and Testing for
Electrical and Electronic Equipment - Part 2.Electrical Loads
GB/T 28046.3-2011 Road Vehicles - Environmental Conditions and Testing for
Electrical and Electronic Equipment - Part 3.Mechanical Loads
GB/T 28046.4-2011 Road Vehicles - Environmental Conditions and Testing for
Electrical and Electronic Equipment - Part 4.Climatic Loads
GB/T 28046.5-2013 Road Vehicles - Environmental Conditions and Testing for
Electrical and Electronic Equipment - Part 5.Chemical Loads
GB/T 30038-2013 Road Vehicles - Degrees of Electrical Equipment Protection (IP-
Code)
GB 34660-2017 Road Vehicles - Requirements and Test Methods of Electromagnetic
Compatibility
QC/T 1128-2019 Automotive Camera
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 On-board Driving Video Recording System; DVR
On-board driving video recording system refers to a system, which is installed on a
vehicle to display, record and store the vehicle’s forward driving images in the mode of
video stream, and the recorded and stored video data can be read.
3.2 Frame Rate
Frame rate refers to the number of frames that generate a complete image per unit of time.
3.3 Effective Pixel
Effective pixel refers to pixel in an electronic image sensor that can perform effective
photoelectric conversion and output image signals.
3.4 Field Viewing Angle
Field viewing angle refers to the angle formed by the two edges of the maximum range
of the lens of the object being tested, through the lens center of the video recording
equipment as the apex, in the video recording equipment.
3.5 Signal Noise Ratio
Signal noise ratio refers to the ratio of the size of video signal to the size of noise signal
(useless signal).
3.6 Dynamic Range
Dynamic range refers to the maximum tone range that can be recorded by the video
recording equipment from the darkest to the whitest.
4 Abbreviations and Symbols
The following abbreviations and symbols are applicable to this document.
DUT. Device Under Test
HFOV. Horizontal Field of View
LW/PH. Line Widths per Picture Height
MTF. Modulation Transfer Function
PHD. Picture Height Distortion
SNR. Signal Noise Ratio
Tmax. Maximum Operating Temperature
Tmin. Minimum Operating Temperature
USmin. Supply Voltage Minimum
VFOV. Vertical Field of View
5 Requirements
5.1 General Requirements
5.2 Field of view
5.2.1 Vertical field of view
As it is shown in Figure 1, conduct the test in accordance with 6.4.1.The system’s
vertical field of view shall satisfy the following stipulations.
5.2.2 Horizontal field of view
As it is shown in Figure 2, conduct the test in accordance with 6.4.2.The system image
shall be able to completely cover the pavement at the boundary line on the left and the
right sides at a distance L2 of 4 m in front of the video acquisition unit. For systems with
the function of adjusting the field of view, any position within the adjustable range shall
satisfy the above-mentioned requirements.
5.2.3 Stationary reference
As it is shown in Figure 3, conduct the test in accordance with 6.4.3, the height I of the
stationary reference object of the vehicle body shall be greater than 0.For systems
with the function of adjusting the field of view, any position within the adjustable range
shall satisfy the above-mentioned requirements.
5.3 Functions
5.3.1 System indicator
5.3.2 Information overlay
In accordance with 6.5.2, conduct the test. In the video stream data recorded by the
system, at least the following information shall be overlaid.
5.3.3 Continuous video recording
In accordance with 6.5.3, conduct the test. After the system continuously records video
for 4 h, the 4 h video stream data stored in the built-in memory shall be continuous,
and the video stream data image shall manifest no abnormality.
5.3.4 Storage management
5.3.4.1 Built-in memory
The system shall have a built-in memory. In accordance with 6.5.4, conduct the test; it
shall comply with the following requirements.
5.3.6 Encoding format
In accordance with 6.5.6, conduct the test. The video stream data of the system may
adopt H.264 or other formats of encoding; be stored in MP4 format.
5.3.7 Power-off protection
In accordance with 6.5.7, conduct the test. The system shall have the function of data
protection in case of power failure. When the external power supply is off, it shall save
the data and avoid data loss.
5.4 Image Performance
5.4.1 Frame rate
In accordance with 6.6.1, conduct the test. The system’s frame rate shall be not less
than 25 frames/s.
5.4.3 Field viewing angle
In accordance with 6.6.3, conduct the test. In addition, record the field viewing angle in the test report.
5.4.4 MTF value
In accordance with 6.6.4, conduct the test. The system’s MTF value shall comply with
the stipulations of Table 1.
5.4.5 Signal noise ratio
In accordance with 6.6.5, conduct the test. The system’s SNR shall be not less than
30 dB.
5.4.6 Dynamic range
In accordance with 6.6.6, conduct the test. The system’s dynamic range shall be not less than 85 dB.
5.4.7 Maximum illumination
In accordance with 6.6.7, conduct the test. The image shall be normally displayed,
without phenomena of screen scrolling, blurred screen, water ripple, color cast and
frame whitening, etc.
5.4.14 Distortion
In accordance with 6.6.14, conduct the test. The system’s distortion shall be not greater than 30%.
5.5 Environmental Assessment
5.5.1 Functional status classification
The system’s functional status classification is shown in Table 2.
5.5.2 Electrical performance
5.5.2.1 DC supply voltage
In accordance with 6.7.1.1, conduct the test. The system’s DC supply voltage range
shall comply with the stipulations of Table 3.During the test and after the test, when
the voltage is within the range of USmin ~ USmax, the functional status shall reach Level-
A; when it operates at USmin and USmax, the MTF value shall comply with the stipulations
of Table 1.
5.5.2.2 Overvoltage
5.5.2.6 Transient voltage change
5.5.2.6.1 Transient voltage drop
In accordance with 6.7.1.6.1, conduct the test. The functional status shall be not lower than Level-B.
5.5.2.9 Open circuit
5.5.2.11 Insulation resistance
In accordance with 6.7.1.11, conduct the test. The system’s insulation resistance shall
be greater than 10 M. After the test, the functional status shall reach Level-A.
5.5.2.12 Reference grounding and power offset
In accordance with 6.7.1.12, conduct the test. The functional status shall be not lower than Level-B.
5.5.3 Electromagnetic compatibility performance
5.5.3.1 Immunity to electrical disturbance from electrostatic discharge
5.5.4.4 Debris impact
In terms of the video acquisition unit or the system containing the video acquisition unit
installed outside the vehicle, in accordance with 6.7.3.4, conduct the test. After the test,
the lens shall not be broken (the surface coating layer is allowed to have slight damage
that does not affect the image quality); the MTF value shall comply with the stipulations
of Table 1; the functional status shall reach Level-A.
5.5.4.5 Lens wear-resistance
In terms of the video acquisition unit or the system containing the video acquisition unit
installed outside the vehicle, in accordance with 6.7.3.5, conduct the test. After the test,
the lens coating film is not allowed to fall off; the MTF value shall comply with the
stipulations of Table 1; the functional status shall reach Level-A.
5.5.4.6 Harness pull-off force
In terms of systems with harness, in accordance with 6.7.3.6, conduct the test. After
the test, there shall be no phenomena of damage, harness breakage and terminal
dropout, etc.; the functional status shall reach Level-A.
5.5.5 Dustproof and waterproof performance
The dustproof and waterproof performance rating of the system’s shell shall be
determined in accordance with different areas installed on the vehicle. The dustproof
and waterproof rating of the sub-areas is shown in Table 5.In accordance with 6.7.4,
conduct the test. After the test, the MTF value shall comply with the stipulations of
Table 1; the functional status shall reach Level-A.
5.5.6 Environmental resistance
6 Test Methods
6.1 Test Conditions
6.1.1 Complete-vehicle test environmental conditions
Except for special regulations, the requirements for the test environment of complete-
vehicle test are as follows.
6.1.2 Test conditions of laboratory
6.1.2.1 Test environmental conditions
If there are no other regulations, the test environmental conditions shall comply with
the stipulations of Table 7.
6.1.2.2 Test voltage conditions
If there are no other regulations, the test voltage conditions shall comply with the
stipulations of Table 8.
6.1.2.3 Light source conditions of laboratory
If there are no other regulations, the light source conditions of laboratory shall comply
with the stipulations of 6.1.1.3 in QC/T 1128-2019.
6.1.3 Test working mode
6.1.4 Test object
When conducting the tests in 6.2, 6.3, 6.4, 6.5.1 and 6.5.2, test object shall be
complete-vehicle. When conducting other tests, test object shall be the system (the
system shall at least include built-in memory and video acquisition unit, excluding
external memory and display unit).
The video stream and image used for the tests shall all be data exported from the built-
in memory.
6.2 System and Installation Inspection
The tester inspects the system status through visual inspection or touching.
6.3 Dynamic Image Quality Test
Drive on a road with environmental conditions, such as. other driving vehicles, traffic
signs and pedestrians; record a video. Use a video player to watch the video images.
See Appendix C for dynamic image quality evaluation and test methods.
6.4 Field of View Test
6.5 Functional Tests
6.5.1 System indicator
6.5.2 Information overlay
Under the environmental conditions specified in 6.1.1, conduct the complete-vehicle
test. After the system operates, record a video; use a video player to watch it.
6.5.3 Continuous video recording
Put DUT under working mode B2; continuously record video for 4 h; use a video player to watch it.
6.5.4 Storage management
Put DUT under working mode B2; continuously record video for 4 h. Through an
external memory card (TF card), export the video stream data in the built-in memory;
use a video player to watch it.
6.5.5 Maximum segment-record interval time
Put DUT under working mode B2.Record the display on the frame rate tester. Use a
video player to perform single-frame playback of the video stream data recorded in the
built-in memory; check the maximum value of the time interval between the end and
the start frames of every two adjacent files in 10 consecutive segments.
6.5.6 Encoding format
Put DUT under working mode B2.Record a video of not less than 1 min. Use a video
player to check the video stream data in the built-in memory.
6.5.7 Power-off protection
Put DUT under working mode B2.Record a video of more than 10 min. Turn off the
power; record the time t1 when the power is turned off. After the system is completely
shut down, use a video player to check and record the last recording time t2 in the built-
in memory; t2 - t1 shall be greater than 0 s.
6.6 Image Performance Test
6.6.1 Frame rate
Put DUT under working mode B1.In accordance with the method in 6.3.2.1 in QC/T
1128-2019, conduct the test.
6.7 Environmental Assessment Test
6.7.1 Electrical performance test
6.7.6 Chemical load test
In terms of system or unit installed outside the vehicle, put DUT under working mode
A1.In accordance with the installation location code [D] selection of reagents and
exposure conditions in Table 1, and the wetting method in Table 2 and the procedures
in 4.8 in GB/T 28046.5-2013, conduct the test. After the test, under working mode B1,
conduct the test.
6.8 Durability Test
Durability test is shown in Appendix A. Durability calculation model is shown in Appendix B.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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