GB/T 38892-2020On-board driving video recording system (English PDF)

3.11 Ghost

Ghost refers to the additional image eventually formed on the image due to the existence of a high-brightness target source in the service environment of the product, which is quickly reflected inside the lens.

3.12 Distortion

Distortion refers to the geometric distortion of the shooting frames relative to the patterns being photographed.

NOTE: if the captured image is larger than the pattern being photographed, it is pincushion distortion, otherwise, it is barrel distortion.

5.3.1.2 Error alarm

In accordance with 6.5.1.2, conduct the test. During the system operation, if a malfunction occurs, it shall be prompted acoustically or optically.

5.3.1.3 Type of malfunction prompts

The type of system malfunction prompts shall at least include:

a) Malfunction of the video acquisition unit;

b) Malfunction of the built-in memory.

The type of prompts and the prompting mode of malfunction alarm signals shall be explained in the product’s instruction manual.

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:

a) In the video stream, date and time information shall be overlaid in the format:

yyyy (year) mm (month) dd (date) hh (hour) mm (minute) ss (second), or yyyy- mm-dd hh:mm:ss;

b) In the video stream, vehicle’s vehicle identification number (VIN) shall be overlaid;

c) The overlaid information shall not affect the watching of the video stream main screen.

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:

5.4.9 Automatic gain control time

In accordance with 6.6.9, conduct the test. After switching between different light sources, the response time of automatic gain control shall be not more than 1 s.

5.4.10 White balance

In accordance with 6.6.10, conduct the test. The neutral color block of the Macbeth 24- color color test chart does not have obvious color difference; the image cannot generate color cast. The color saturation (S) value in the #21 and #22 blocks (the middle two blocks) grayscale card HSV of the 24-color test chart shall be less than

15%.

5.4.11 Color rendition

Color rendition is based on the hue angle of the CIE 1976 chromaticity space. In accordance with 6.6.11, conduct the test. The Euclidean distance of the actually measured chromaticity error between each color block and the white block shall be not less than 0.02.

The hue angle shall satisfy the following requirements:

a) The coordinate of the red color block shall be within the range of (0°, 44.8°) or (332.2°, 360°);

b) The coordinate of the green color block shall be within the range of (96.6°,

179.9°);

c) The coordinate of the blue color block shall be within the range of (209.9°,

302.2°);

d) The coordinate of the yellow color block shall be within the range of (44.8°,

96.6°).

5.4.12 Glare

In accordance with 6.6.12, conduct the test. When the lens is exposed to extreme bright light, the area of the generated spot shall be not greater than 25% of the displayed area.

5.4.13 Ghost

In accordance with 6.6.13, conduct the test. The area ratio of ghost image to the field of view shall satisfy the following requirements:

a) If the peak brightness ratio of the ghost image to the original image is greater than 50%, then, the area ratio of ghost image to the field of view shall be less than 1%;

In accordance with 6.7.1.3, conduct the test. During the test and after the test, the functional status shall reach Level-A.

5.5.2.4 Slow voltage drop and rise

In accordance with 6.7.1.4, conduct the test. During the test and after the test, when the voltage is within the range of USmin ~ USmax , the functional status shall reach Level-

A.

5.5.2.5 Slow voltage drop and quick voltage rise

In accordance with 6.7.1.5, conduct the test. During the test and after the test, when the voltage is within the range of USmin ~ USmax , the functional status shall reach Level-

A.

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.

5.5.2.6.2 Reset performance of voltage sag

In accordance with 6.7.1.6.2, conduct the test. During the test, when the voltage restores to USmin, and after the test, the functional status shall reach Level-A.

5.5.2.6.3 Startup characteristic

In accordance with 6.7.1.6.3, conduct the test. The functional status shall be not lower than Level-C.

5.5.2.7 Reverse voltage

In accordance with 6.7.1.7, conduct the test. After the test, the functional status shall reach Level-A.

5.5.2.8 Short-term power interruption

In accordance with 6.7.1.8, conduct the test. During the test, when the power supply interruption time does not exceed 100 µs, the functional status shall reach Level-A.

When the power supply interruption time exceeds 100 µs, and does not exceed 10 s, the functional status shall be not lower than Level-C. After the test, the functional status shall reach Level-A.

5.5.2.9 Open circuit

5.5.2.9.1 Single-line disconnection

5.5.4.2 Mechanical impact

In accordance with 6.7.3.2, conduct the test. During the test and after the test, no damage is allowed; the functional status shall reach Level-A. After the test, the MTF value shall comply with the stipulations of Table 1.

5.5.4.3 Free fall

In accordance with 6.7.3.3, conduct the test. After the test, no invisible damage is allowed; the functional status shall reach Level-A. The MTF value shall comply with the stipulations of Table 1.

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.

5.5.6.3.2 High-temperature operation

In accordance with 6.7.5.2.2, conduct the test. The functional status shall be not lower than Level-B.

5.5.6.4 Temperature gradient

In accordance with 6.7.5.3, conduct the test. The functional status shall be not lower than Level-B.

5.5.6.5 Temperature cycle

5.5.6.5.1 Temperature cycle with specific rate of change

In accordance with 6.7.5.4.1, conduct the test. The functional status shall be not lower than Level-B.

5.5.6.5.2 Rapid temperature change with specified conversion time

In accordance with 6.7.5.4.2, conduct the test. After the test, the functional status shall reach Level-A.

5.5.6.6 Damp heat test

5.5.6.6.1 Damp heat cycle

In terms of system or unit installed in the passenger compartment, in accordance with

6.7.5.5.1, conduct the test. The functional status shall be not lower than Level-B.

In terms of system or unit installed outside the vehicle, there is no requirement.

5.5.6.6.2 Combined temperature / humidity cycle

In terms of system or unit installed outside the vehicle, in accordance with 6.7.5.5.2, conduct the test. The functional status shall be not lower than Level-B.

In terms of system or unit installed in the passenger compartment, there is no requirement.

5.5.6.6.3 Steady-state damp heat

In accordance with 6.7.5.5.3, conduct the test. During the test and after the test, the functional status shall reach Level-A.

5.5.6.7 Ice water impact

In terms of system or unit installed outside the vehicle, in accordance with 6.7.5.6, conduct the test. During the test and after the test, the functional status shall reach

Level-A.

Working mode B1: test sample is normally electrically connected; all functions are normally operating; an external display equipment is required.

Working mode B2: test sample is normally electrically connected; all functions are normally operating, but no external display equipment is required.

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

6.4.1 Vertical field of view

Under the environmental conditions specified in 6.1.1, conduct the complete-vehicle test. The test site shall be arranged in accordance with Figure 1, so that the system is in the working state (if necessary, supplemented by activation measures). See the test procedures below:

a) At a distance of L and a height of H on the front axis of the video acquisition unit, place a test chart. Record a video; use a video player to watch it;

b) At a distance of L1 and a height of H1 on the front axis of the video acquisition unit, hang a test chart. Record a video; use a video player to watch it.

6.4.2 Horizontal field of view

Under the environmental conditions specified in 6.1.1, conduct the complete-vehicle test. The test site shall be arranged in accordance with Figure 2, so that the system is in the working state (if necessary, supplemented by activation measures). Record a video; use a video player to watch it.

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.

6.6.2 Effective pixel

Put DUT under working mode B1. In accordance with the method in 6.3.2.2 in QC/T

1128-2019, conduct the test.

6.6.3 Field viewing angle

Put DUT under working mode B1. In accordance with the method in 6.3.2.3 in QC/T

1128-2019, conduct the test.

6.6.4 MTF value

Put DUT under working mode B1. In accordance with the method in 6.3.2.4 in QC/T

1128-2019, conduct the test.

6.6.5 Signal noise ratio

Put DUT under working mode B1. In accordance with the method in 6.3.2.5 in QC/T

1128-2019, conduct the test.

6.6.6 Dynamic range

Put DUT under working mode B1. In accordance with the method in 6.3.2.6 in QC/T

1128-2019, conduct the test.

6.6.7 Maximum illumination

Put DUT under working mode B1. In accordance with the method in 6.3.2.7 in QC/T

1128-2019, conduct the test.

6.6.8 Minimum illumination

Put DUT under working mode B1. In accordance with the method in 6.3.2.8 in QC/T

1128-2019, conduct the test.

6.7.1.4 Slow voltage drop and rise

Put DUT under working mode B1. In accordance with the method in 4.5.2 in GB/T

28046.2-2019, conduct the test.

6.7.1.5 Slow voltage drop and quick voltage rise

Put DUT under working mode B1, conduct the test.

The test procedures are as follows:

a) Stage of dropping: at the rate of (0.5 ± 0.1) V/min, drop from USmax to 0 V;

b) Stage of rising: in less than 0.5 s, the voltage quickly rises from 0 V to USmax .

6.7.1.6 Transient voltage change

6.7.1.6.1 Transient voltage drop

Put DUT under working mode B1. In accordance with the method that UN is 12 V in

4.6.1.2

in GB/T 28046.2-2019, conduct the test.

6.7.1.6.2 Reset performance of voltage sag

Put DUT under working mode B1. In accordance with the method in 4.6.2.2 in GB/T

28046.2-2019, conduct the test.

6.7.1.6.3 Startup characteristic

Put DUT under working mode B1. In accordance with the method in 4.6.3.2 (Level-II in Table 3) in GB/T 28046.2-2019, conduct the test.

6.7.1.7 Reverse voltage

Put DUT under working mode A2. In accordance with the method in 4.7.2.3 in GB/T

28046.2-2019, conduct the test. After the test, test under working mode B1.

6.7.1.8 Short-term power interruption

Put DUT under working mode B1. In accordance with the method in Table 9 and the waveform in Figure 7, conduct the test.

Put DUT under working mode B1. Its data interface shall be tested in accordance with the method in 4.10.2.1 in GB/T 28046.2-2019.

6.7.1.11 Insulation resistance

Put DUT under working mode B1. In accordance with the method in 4.12.2 in GB/T

28046.2-2019, conduct the test. After the test, test under working mode B1.

6.7.1.12 Reference grounding and power offset

Put DUT under working mode B1. In accordance with the method in 4.8.2 in GB/T

28046.2-2019, conduct the test.

6.7.2 Electromagnetic compatibility test

6.7.2.1 Immunity to electrical disturbance from electrostatic discharge

6.7.2.1.1 Electronic module, not powered on

Put DUT under working mode A1. In accordance with the category 1 test severity level not lower than L 3 test voltage requirements in Table C.1 and Table C.2 in Appendix C, and the methods in Chapter 9 in GB/T 19951-2019, conduct the test. After the test, test under working mode B1.

6.7.2.1.2 Electronic module, powered on

Put DUT under working mode B1. In accordance with the category 1 test severity level not lower than L 3 test voltage requirements in Table C.1, C.2 and C.3 in Appendix C, and the methods in Chapter 8 in GB/T 19951-2019, conduct the test.

6.7.2.2 Immunity to electrical disturbance caused by conduction and coupling

6.7.2.2.1 Immunity to electrical transient conduction along supply lines

Put DUT under working mode B1. In accordance with the immunity test level in Table

4, and the method of pulse 1, 2a, 2b, 3a, 3b, 4, 5b in GB/T 21437.2-2008, conduct the test.

6.7.2.2.2 Immunity to electrical transient conduction by capacitive coupling other than supply lines

Put DUT under working mode B1. In accordance with CCC mode and the requirements of Level-III in Table B.1, and the method in 3.4.2 in GB/T 21437.3-2012, conduct the test.

6.7.2.3 Immunity to electromagnetic radiation

Put DUT under working mode B1. In accordance with the immunity test intensity of

6.7.3.5 Lens wear-resistance

Put DUT under working mode A1. In accordance with the method stipulated in 6.6.5 in

QC/T 1128-2019, conduct the test. After the test, test under working mode B1; in accordance with 6.6.4, test the MTF value.

6.7.3.6 Harness pull-off force

Put DUT under working mode A1. In accordance with the method stipulated in 6.6.6 in

QC/T 1128-2019, conduct the test. After the test, test under working mode B1.

6.7.4 Dustproof and waterproof test

6.7.4.1 Dustproof

Put DUT under working mode A2. In accordance with the method stipulated in 8.3.3.2 in GB/T 30038-2013, conduct the test. After the test, test under working mode B1; in accordance with 6.6.4, test the MTF value.

6.7.4.2 Waterproof

Put DUT under working mode A2. In accordance with the method stipulated in 8.4.3 in

GB/T 30038-2013, conduct the test. After the test, test under working mode B1; in accordance with 6.6.4, test the MTF value.

NOTE: in terms of the image acquisition unit installed in the passenger compartment, only the lens surface shall be tested.

6.7.5 Environmental weather resistance test

6.7.5.1 Low-temperature test

6.7.5.1.1 Low-temperature storage

Put DUT under the lower limit of storage temperature in Table 6 and working mode A1;

in accordance with the method in 5.1.1.1.2 in GB/T 28046.4-2011, conduct the test.

After the test, let it rest for 2 h to return to normal temperature, then, under working mode B1, conduct the test.

6.7.5.1.2 Low-temperature operation

Put DUT under Tmin and working mode B1. In accordance with the method in 5.1.1.2.2 in GB/T 28046.4-2011, conduct the test. After the test, let it rest for 2 h to return to normal temperature, then, under working mode B1, conduct the test.

6.7.5.2 High-temperature test

6.7.5.2.1 High-temperature storage

6.7.5.5.3 Steady-state damp heat

Put DUT under working mode B2. In accordance with the method in 5.7.2 in GB/T

28046.4-2011, conduct the test. In the last hour of the test, switch to B1 mode for testing. After the test, let it rest for 2 h to return to normal temperature, then, under working mode B1, conduct the test.

6.7.5.6 Ice water impact

Put DUT under working mode A2. In accordance with the method in 5.4.2.1 in GB/T

28046.4-2011, conduct the test. During the test and after the test, under working mode

B1, conduct the test.

6.7.5.7 Salt spray corrosion

Put DUT under working mode A2. In accordance with the method in 5.5.1.2 in GB/T

28046.4-2011, conduct the test. After the test, under working mode B1, conduct the test.

6.7.5.8 Solar radiation

In terms of system or unit installed outside the vehicle, put DUT under working mode

A1. In accordance with Method 1 and the stipulations of Cycle A in Table 3 in GB/T

1865-2009, conduct 600 h test.

In terms of system or unit installed in the passenger compartment with direct sunlight, put DUT under working mode A1. In accordance with Method 2 and the stipulations of

Cycle C in Table 3 in GB/T 1865-2009, conduct 600 h 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.

In terms of system or unit installed in the passenger compartment, put DUT under working mode A1. In accordance with the installation location code [B] 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.