Brief Introduction
Reversing has always been a headache for the majority of drivers, and even experienced drivers have had scratching experiences. Therefore, from the original ultrasonic probe to the popular visual reversing radar, reversing radar products have become one of the necessary safety equipment for automobiles. But at the same time, the visual reversing radar based on a single rear-view camera can only see the body directly behind, and cannot see the surroundings of the body at the same time. There is a blind spot, so there is a need for 360-degree panoramic image reversing around the body, that is, panoramic parking assistance system. This system can be more intuitive and safe and reliable to assist the reverse, so it must become the trend of the parking system. At present, only a very small number of luxury models such as the BMW X6 and Infiniti EX35 have introduced the panoramic parking system.
The panoramic parking system is equipped with 4 to 8 wide-angle cameras around the vehicle that can cover all the fields of view around the vehicle. The multi-channel video images collected at the same time are processed into a 360-degree top view of the vehicle body around the vehicle, and finally in the center console The display on the screen allows the driver to clearly see if there are obstacles around the vehicle and to understand the relative orientation and distance of the obstacles, helping the driver to park the vehicle easily.
Main chip introduction
The main chip adopts NXP's PNX953X series, the core is a high-performance 32-bit Trimedia TM3282 core with a very long instruction word (VLIW), executes 8 instructions in parallel in a single cycle, and supports IEEE standard single-precision floating-point operations at speeds up to 450MHz. The block diagram of PNX953X is as follows:
For panoramic parking applications, the recommended model is PNX9530, the main frequency is 351MHz, the characteristics are as follows:
High-performance DSP core. Trimedia TM3282, VLIW structure, support IEEE standard single precision floating point operation
Support up to 8 PAL / NTSC camera inputs (ITU656 interface)
32-bit DDR1 / DDR2 memory interface, frequency up to 266MHz (data rate up to 533MHz)
Support up to 2 digital LCD screen outputs, or 2 PAL / NTSC ITU656 outputs
Support image zoom, de-interlace, OSD and other functions, can achieve image split-screen display, dynamic overlay reversing track and other effects
In addition to the above features for panoramic parking applications, the PNX9530 also has powerful multimedia processing capabilities to meet the requirements of in-vehicle entertainment:
Support up to 3 displays (can display 2 different screens)
High-performance video decoder that supports H.264, MPEG-4, MPEG-2, RMVB, VC-1 and other formats. H.264 supports 720p or dual D1
High-performance audio decoder supporting Dolby, DTS, MP3, WMA, AAC, etc.
With DVD controller, IDE hard disk interface, USB OTG, SD card, and many other multimedia application peripherals
Option 1: Panorama parking assist system
The system installs wide-angle cameras in the four directions of the front, rear, left and right of the vehicle body (as shown in the figure), and corrects the distortion of the four wide-angle cameras for bird's eye view transformation (perspective transformation), and then performs image stitching to synthesize Aerial view around the car body.
Solution advantages
high performance. The PNX9530 has a main frequency of up to 351MHz, can execute 8 instructions per instruction cycle, and supports IEEE standard floating-point operations. DDR2 data rate reaches 533MHz / 32 bit, can provide enough memory bandwidth to handle large amounts of video data
low cost. Competitor products that can support simultaneous 4-channel video input, and can perform distortion correction and bird's-eye view conversion on video images are much more expensive than PNX9530
Support up to 8 camera inputs, with high flexibility and scalability
OSD overlay, reversing track overlay, image split screen display, de-interlacing, etc. can be realized by DSP, without the need for additional dedicated chips, to minimize system complexity and save the cost of the whole machine
Support 2 digital LCD screen output
Automotive-grade chips have passed AEC-Q100 certification, eliminating stability concerns
Solution 2: High-performance multimedia platform + panoramic parking assist system
PNX953X has powerful multimedia processing capabilities. In addition to the panoramic parking imaging, it can also make full use of the multimedia functions of the PNX9530 processor to realize DVD playback, high-definition video playback, digital TV viewing, Bluetooth communication, high-performance audio input and output, USB device connection and SD card connection. To present you with more pure entertainment and more advanced enjoyment. These multimedia and panoramic parking functions can be implemented in a PNX9530.
Solution advantages:
A high-performance and low-cost platform can simultaneously implement a multimedia entertainment system and a bird's-eye parking system
Support up to 3 displays (can display 2 different screens)
High-performance video decoder that supports H.264, MPEG-4, MPEG-2, RMVB, VC-1 and other formats. H.264 supports 720p or dual D1
High-performance audio decoder that supports Dolby (Dolby), DTS, MP3, WMA, AAC, etc., and through the high-performance PNX9530 processor with floating-point computing capabilities, can achieve professional-grade high-quality car audio effects
With DVD controller, IDE hard disk interface, USB OTG, SD card, and many other multimedia application peripherals
Physical picture
The picture below is the physical picture of PNX9530 DEMO.
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