This paper first explores the technical features of AVT (Advanced Video Transfer) technology in coaxial high-definition digitalization, then presents related system solutions and practical implementations, and finally discusses its potential to enhance the security of vehicle vision applications. Car video surveillance has become a key area for digital video technology, with strict requirements on stability, reliability, and real-time transmission due to safety concerns. As the industry moves toward digitalization, AVT has emerged as a leading solution, offering lossless and real-time HD video transmission that supports advanced driver assistance systems (ADAS) and other critical applications.
The concept of car vision is becoming a reality. Initially, video surveillance was used primarily for road monitoring, but it soon expanded into in-vehicle systems. Early systems were simple video recorders, typically installed at the front of the vehicle, capturing and storing video with minimal delay. Later, rear-facing cameras were added to increase coverage, allowing for multi-channel processing or synthesis at the front-end processor. At that time, there were no specific requirements for signal transmission quality or method.
With the rise of intelligent video processing, in-car cameras could now analyze and process video in real time, providing early warnings for potential driving hazards. This enabled vehicles to have basic visual functions, contributing to assisted driving. Car video systems can be broadly categorized into 360° panoramic systems and rear-view monitoring systems. The components and transmission methods involved are discussed below.
As shown in Figure 1, a 360° panoramic driving system consists of front and rear cameras equipped with wide-angle lenses, which send images to a host for stitching, trimming, and display. While most current products use standard definition, the growing performance of host chips is enabling higher resolution support. With the increasing adoption of 720P HD displays, the demand for HD monitoring in vehicles is rising rapidly. Reliable, high-capacity digital HD transmission is essential for transmitting clear video signals from each camera to the host.
Figure 1: 360° Panoramic Driving System
The rear-view monitoring system has also seen significant growth. It evolved from basic recording devices to more advanced systems capable of switching to a rear camera when reversing. These systems are cost-effective and easy to install, making them popular in the market. As HD screens become more common, consumers are demanding higher-resolution cameras, creating new opportunities for digital HD in automotive rear-view applications.
Several chip manufacturers are now competing in this space, including Quanzhi, MediaTek, Mercedes, Rockchip, Intel, and Qualcomm. Their products offer various solutions tailored for both front and rear installations.
Innovative video transmission methods are essential for improving the performance of car video systems. Digital HD transmission not only enhances image clarity but also ensures lossless and real-time data transfer. In vehicles, where wiring is complex and reliability is crucial, coaxial cables or Ethernet are preferred over traditional AV cables. While analog solutions like HD-TVI, HD-CVI, and AHD are still used, they face limitations in terms of image quality and consistency, especially under varying environmental conditions.
AVT, a digital coaxial transmission technology, addresses these challenges by using an all-digital architecture and efficient compression algorithms. It achieves near-zero latency—less than 3 milliseconds—and maintains image quality without degradation over distance or environmental changes. Unlike analog systems, which suffer from signal loss and jitter, AVT provides consistent, high-quality video suitable for machine vision applications such as ADAS.
AVT also supports adaptive transmission, adjusting compression based on distance and signal strength. It enables bidirectional data transfer and supports multiple interfaces, including UART, IR, I2C, SPDIF, I2S, and Ethernet. This makes it ideal for in-vehicle systems requiring multi-functionality and scalability.
When integrated with a 360° panoramic system, AVT improves the overall performance of the system. The NS2520 transmitter and NS2521 receiver work together to encode and decode video signals efficiently, supporting formats like BT656/1120, CEA-861, DVP, and more. This ensures seamless integration and high-quality output.
Figure 2: Block Diagram of AVT in the Panoramic Parking System
Looking ahead, the future of assisted driving is promising. As ADAS becomes more widespread, the need for high-definition, real-time video transmission will grow. AVT offers a reliable and efficient solution, enabling accurate video capture and transmission for applications such as lane keeping, collision warning, and autonomous driving. With ongoing advancements, AVT is set to play a key role in shaping the next generation of automotive vision systems.
As shown in Figure 3, AVT HD cameras are used in ADAS systems. The CMOS sensor and ISP unit are tightly coupled with the AVT transmitter, ensuring low-latency, high-quality video output via Ethernet. The receiving unit decodes the signal, restoring it to a visually lossless format for real-time processing and display. Multiple AVT cameras can share a single receiver, making the system scalable and flexible.
Figure 3: Application of AVT HD Camera in ADAS System
The automotive video market is expanding rapidly, driven by smart rearview mirrors and driving recorders. The transition from SD to HD, and from analog to digital, is accelerating, with digital HD video transmission playing a central role. As ADAS becomes more prevalent, the demand for reliable, high-performance video solutions will continue to grow.
This year marks the beginning of China’s smart driving assistance market, with ADAS expected to see rapid growth over the next decade. Regulatory requirements and consumer interest are driving adoption, with many countries mandating safety features like automatic emergency braking and forward collision warning. As processors and sensors become more powerful, semiconductor companies are focusing on developing complete system solutions that meet both post-installation and pre-installation needs.
AVT series chips are designed to meet stringent automotive standards, with upcoming 4K & 2K support to address ultra-HD ADAS requirements. As the industry evolves, AVT is well-positioned to lead the way in enhancing vehicle vision security and performance.
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