{"id":75530,"date":"2025-11-04T11:49:10","date_gmt":"2025-11-04T03:49:10","guid":{"rendered":"https:\/\/hongtronics.com\/?p=75530"},"modified":"2025-11-04T12:59:05","modified_gmt":"2025-11-04T04:59:05","slug":"proframe-multi-camera-time-synchronization","status":"publish","type":"post","link":"https:\/\/hongtronics.com\/en\/proframe-multi-camera-time-synchronization\/","title":{"rendered":"Honghong\uff5cproFRAME Multi-Camera Image Acquisition and Injection Board: High-precision Time Synchronization Solution for Intelligent Driving, Realizing Microsecond Image Calibration"},"content":{"rendered":"
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preamble<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Intelligent driving and autonomous driving technologies are gradually developing and maturing.Vehicle-mounted multi-phase machine sensing system<\/strong><\/span>It has become a central key to vehicle safety and environmental recognition.<\/span>
Multiple in-vehicle cameras capture video data from different angles, enabling the vehicle to obtain more complete environmental information to help complete theLane Detection, Object Recognition, Pedestrian Alert, Traffic Sign Recognition<\/strong><\/span>It provides a key visual foundation for self-driving and ADAS systems.<\/span><\/p>

However, if multiple camerasLarge Time Synchronization Offset will cause the image data to be misaligned on the time axis, which will seriously affect the accuracy of the image fusion and decision-making algorithms.<\/strong>\u3002<\/span><\/span>
In response to this challenge, Honghong has teamed up with Solectrix of Germany to launch a new product, \"The Newest and Most Innovative Products in the World\". proFRAME Modular Image Acquisition and Injection Boards<\/strong><\/span>Provide DodaFive microsecond synchronization schemes<\/strong><\/span>It helps the in-vehicle imaging system to achieve high-precision time alignment during the R&D and testing phases to ensure the stability and safety of intelligent driving.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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I. Technical Background<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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In the age of smart cars and autonomous driving.Multi-Camera System (Multi-Camera System)<\/strong> <\/span>It is the basis for realizing environmental awareness.<\/span>Multiple in-vehicle cameras are required to simultaneously capture environmental images and performImage Fusion and Time Synchronization<\/strong><\/span>This is to ensure that ADAS or self-driving algorithms can read the scene at the right time.<\/span><\/p>

Since each camera has different sensors, image processing processes and transmission delays, failure to achieve precise synchronization may result in misalignment of visual perception, fusion errors and delays in judgment, and ultimately, in the end.Impacts on Vehicle Decision Making and Driving Safety<\/span><\/strong>\u3002<\/span><\/p>

proFRAME Modular Image Acquisition and Injection Boards<\/strong><\/span>It is designed to solve this problem by supporting multiple clock source synchronization methods to achieveMicrosecond time calibration<\/strong><\/span>It meets the needs of applications such as in-vehicle imaging systems, ADAS, domain controllers and HiL (Hardware-in-the-Loop) test platforms.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Second, proFRAME high-precision time synchronization five solutions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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1. Baseboard FPGA Clock Signal Trigger Synchronization<\/span><\/h4>

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FPGA generation for proFRAME boards 40 MHz clock signal (25ns interval)<\/strong>The image is captured and injected into the image, and each frame can be labeled with theNanosecond time stamp (Timestamp)<\/strong>\u3002<\/span>
All connected cameras are triggered with this unified clock signal to realizeMicrosecond multi-phase machine synchronization<\/strong>This ensures consistent image timing and provides an accurate basis for subsequent image fusion and perceptual algorithms.<\/span><\/p>

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2. Synchronization of phase pulse signal triggering<\/span><\/h4>

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Some cameras support a built-in Trigger Pulse output, which can be used as a clock source for multiphase synchronization.<\/span>When the main camera outputs a pulse signal, it is transmitted to the proFRAME FPGA via a coaxial cable, and then the FPGA distributes it to the other cameras, so that all the camerasActivate video capture at the same moment.<\/strong>It is also effective in minimizing time deviation.<\/span><\/p>

3. External Trigger Synchronization<\/span><\/h4>

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The proFRAME boards also support the use of other sensors (e.g., LiDAR, millimeter wave radar, IMU, GNSS, etc.).Cross-module time synchronization<\/strong>\u3002<\/span>Trigger signals from external devices can be distributed to multiple cameras through the board to realizeUniform time reference across sensors<\/strong>This ensures that heterogeneous perceptual data remains highly consistent when fused.<\/span><\/p>

4. ECU bypass trigger synchronization<\/span><\/h4>

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proFRAME SupportReal-time collection and bypass output mode (Bypass Mode)<\/strong>The video data can be output to both the host and ECU\/Domain Controller at the same time.<\/span>
The ECU can also send back the triggered clock signal through the reverse control channel to realize two-way time synchronization between the ECU and the camera, ensuring that the data stream (Video Stream) and control signals (I2C, GPIO) are fully aligned.<\/span><\/p>

5. Time synchronization between multiple boards<\/span><\/h4>

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When more than 8 cameras are required for a video system, proFRAME supports multi-card linkage.<\/span>Board-to-Board Internal\/External Trigger Interface<\/strong> Shared FPGA clock signals to enableMulti-card synchronized triggering<\/strong>This ensures that the time error between all cameras is maintained at the microsecond level.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Program testing and validation<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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1. Three-camera time synchronization and image acquisition test<\/span><\/strong><\/p>

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The proFRAME board connects to three Senyun cameras, model SG5-IMX490C-5300-GMSL2 (resolution 2880\u00d71860, sample rate 30fps).<\/span>The system is triggered by the FPGA clock signal built into the card to synchronize the exposure and image acquisition process of the three cameras.<\/span><\/p>