In recent years, the automotive image sensor field has been explosive growth, which is mainly driven by the government's implementation and implementation of the car safety decree, and the consumer driving experience and automatic driving trend.
Car image sensor main application field
Multiple different cameras can be installed as different functions, including for visual applications such as reversing images, front view, topowing, topowing, top view, a panoramic parking image, mirror replacement, for the cabin such as passenger monitoring, Fatigue driving monitoring, instrument panel control, driving recorder (DVR), airbag, for ADAS, such as forward collision warning, lane deviation warning, automatic high beam control, traffic signal identification, pedestrian testing, adaptive cruise control, blind spot detection , Night vision, etc.
Key performance of car image sensors
1. Micro-light performance is chip
Micro-light performance is quite important to the automotive imaging system, and excellent micro-light performance can improve driving safety at night and other light. Image sensor manufacturers are targets with "see" in the dark ".
2. High dynamic range (HDR)
HDR is another important feature of the automotive imaging system application, ensuring that the camera can clearly present the scene detail in a wide range of light, dark and high-light comparison, and improve the accuracy of image information to improve safety.
3. Wide angle fish eye distortion correction (DEWARP)
Wide angioplastic lens is used to have a wide view of the vehicle image, but the acquired image information produces a certain degree of distortion, using Dewarp technology to real-time correction of video image generated by wide-angle fish eye lens, and recover the image flat.
4. Image overlay
The image superimposed index is used by the image sensor and the image processing auxiliary chip to achieve extension, zoom, right view, two plates left / right, triple screen, and reversing dynamic aid line. Image superposition functions can better assist the driver to see the surrounding environment and reduce the accident rate.
Anshen American Semiconductor's car image sensor solution
Since the launch of the world's first car CMOS image sensor in 2004, Messemei semiconductor provides a special imaging program for the automotive industry has more than 10 years of experience. It has become the leader of the global automobile application image sensor, and the city accounts for 44 of the entire automotive sensor market. %, The image sensor market for ADAS is 70%, in the rear view image and the ADAS field are the first; in terms of quality and performance, the Anshen American car image sensor is fully compliant with AEC-Q100, And provide superior micro-light performance, single-chip multi-exposure high dynamic range (HDR, >120 dB), and automotive-level applications such as fishey distortion correction and image overlapping, and launch the world's first support for Asil in 2015 ( Automotive Safety Integrity Level) Image Sensor.
For certain applications, Messemo semiconductors also offer global shutter image sensors with excellent performance, such as near-infrared (NIR) programs that are about to be launched for vehicle cabin fatigue detection applications. In order to cooperate with the market towards the high-definition trend, Ann Moshi semiconductor launched a large number of 1 million pixel programs, and more 1080P sensors will be developed in the future.
Figure 1: Automotive image sensor application and Ansian semiconductor market status
ASX344 / 340 / 350AT is a system-level chip (SOC) for reverse image, integrated image signal processor on a single chip, enhanced pixel performance provides higher visibility under micro-light conditions, support up to 4 layers of image stacks To provide more reversing information to the display system, support digital scaling and translation, and additional optical center point correction function, which provides customers with camera package production post-lens center point correction function, thereby saving costs.
These three image sensors are fully certified by AEC-Q100 and have a wide operating temperature range of -40 ° C to 105 ° C, and their difference is:
ASX344AT also integrates fish eye distortion correction and providing UART control interfaces, positioning as "high performance";
The optical format of the ASX350AT is 1/5 inches, different from the 1/4 inches of ASX344 / 340AT, positioned as "high cost" option;
The ASX340AT is positioned as "mainstream" scheme.
Designers can choose targeted solutions based on the specific needs of the target customer.
Table 1: ASX344 / 340 / 350AT specific specifications
Table 2: ASX344 / 340 / 350AT configuration selection
ASX344AT fish eye distortion correction features provide 180o wider scene coverage, sensor dynamic range reflects good W / DR-PIX pixel technology, no matter whether they are more secure, no nights, no more favorable, without fishe eye. As shown in FIG. 1, the lens without fish eye is not captured to the small yellow people's image information, and after the fisheye correction, the driver can see the two small yellow people behind the car from the display, thereby avoiding reversing Safety hidden dangers.
Figure 2: ASX344AT fish eye distortion correction example (left: day; right: night)
The Asx34xat series is day (typically 100-200 lux bright light) and night (typical situation for car reversing cameras in the night, about 10 lux, using brake lights and reversing lamps) are more than similar competition devices to provide better color saturation And contrast, as shown in the red circle, under the light conditions of day 180 lux, the image collected by the competition device is excessively sharpened, and the color boundary has gray spots; under the nightlight 9.5 LUX light conditions, competition devices The image collected excessively sharpened and has more noise.
Figure 3: Comparison of the imaging of ASX34X and competition devices
The back-illuminated (BSI) sensor typically provides a higher sensitivity than the aforementioned sensor. ANANM STMO image sensor AR0135AT is a back-illuminated sensor that meets the car standard, providing excellent micro-optical signal-to-noise ratio, visible light sensitivity and near-infrared performance, is supported linear and high dynamic range (120 dBD) mode Single-chip solutions provide similar optimal performance for your car ADAS and view cameras.
When the existing ADAS and visual application are fused, ASIL will be a reference point for the compliance and applicability of the new system, and the ASIL B compliance is the current ADAS designer's goal. Anshen Mei Semiconductor launched the world's first 23 megapixel CMOS image sensor AR0231AT in ASIL B. The device also uses breakthrough techniques for reducing LED flashing (LFM), and establishes a new reference for the ADAS application.
LFM technology eliminates high-frequency LED flashing traffic lights and car LED lighting, making traffic signal reading algorithms to work under all illumination conditions. The AR0231AT has 1 / 2.7 inches (6.82 mm) optical format and 1928 (horizontal) x 1208 (vertical) active pixel array. It uses the latest 3.0 micron back-illuminated pixels and Ansian Semiconductor's DR-PIXTM technology to provide dual conversion gain to improve performance under all illumination conditions. It captures images in linear, HDR, or LFM mode, and provides frames between the mode to the frame.
The AR0231AT provides a 4-re-exposure HDR to capture more than 120 dB dynamic ranges with excellent noise performance, which can synchronize multiple cameras to easily implement multiple sensor nodes in automotive applications, and through a simple double line string. The line interface implements user programmability. It also has multiple data interfaces, including MIPI (mobile industrial processor interface), parallel and Hispi (high speed serial pixel interface). Other key features include optional automation or black level control of user-controlled, support spread spectrum clock input and multi-color filter array selection.
In addition, the Ansian Semiconductors also provide advanced image coprocessors for total system programs, such as the AP0200AT image coprocessor optimized for rear view cameras and provide Ethernet output, integrated support for lens distortion correction and fish eye correction spatial conversion engine (Ste), and precision superimposed graphics engine; AP0201AT image coordinator also provides Ethernet output, targeting a panoramic reversing camera based on Ethernet; AP0202AT image coproat device for digital panoramic reversing, using 24-bit parallel output; AP0102AT image The coprocessor is for 1 million pixel 720p rear view, including STE, and superimposed graphics engines.
These coprocessors provide functional security features that conform to A-class A-class and B-class in accordance with the Automotive Safety Integrity Level (ASIL). The AP020X series can be coordinated with existing image sensors such as 1 million pixels AR0140AT, AR0132AT, and AR0136AT and new 2 megapixel 1080p sensor AR0230AT.
Conclusion
Car installation cameras eliminates traditional mirrors, reducing traffic accidents, and the basis of rapid development of the car network, will gradually be promoted and applied in practice, and even become a car standard. The image sensor is behind the hero.
Ansian Semiconductor is a global automotive image sensor's table, product and program lineups throughout the segment, including visual and ADAS applications, providing high dynamic range, excellent performance, and wide temperature range, while targeting Emerging fields, such as the vehicle cabin, provide excellent performance global shutter programs, fully compliant with the AEC-Q100, combined with market trends and customer needs, continuously promote new product development, increase more interfaces, and meet the direction of Asil. .
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