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The SONY car CMOS image sensor 2019-06-19
Usually, drivers are more prone to traffic accidents at night when sight lines are poor, the main reason being that at night natural light source is insufficient which affects the driver's range of vision. 
 
To address this issue, the night vision system in the Advanced Driver Assistance Systems (ADAS) system allows the driver to react earlier to avoid traffic accidents. The high-sensitivity image sensor assists the driver with reference information regarding pedestrians, vehicles and the environment.
 
 
CMOS image sensors are the most commonly used and they usually contain a Color Filter Array (CFA). A CFA is a mosaic layer on top of an image sensor and its purpose is to collect color information of images. 
The color filters filter the light by wavelengths. Each specific color filter only allows light of a specific wavelength to pass. For example, the common Bayer Filter (also known as RGB Filter) obtains information about the density of red, green, and blue light on a pixel level,
and uses Demosaicing Algorithms to calculate the color values of the pixels. 

There are different CFAs on the market for different purposes. Many CFAs for vehicles adopt the Red-Monochrome (RCCC) configuration, which contains three clear (colorless) filters and a red filter.

Compared with Bayer Filters, which discard 2/3 of the light source during processing, RCCC-style CFA signals are more sensitive and their imaging in low-light environments reduces noise better than RGB-style CFAs. The red light intensity is sufficient to determine the headlights (white) and taillights (red) of cars.
 




In addition, the outer edge of this sensor is RCCB, which directly transmits 50% of the light source, while the remaining red and blue filters each account for 25%. 
 
RCCB's weak light sensitivity is slightly worse than RCCC, but it is better able to distinguish colors. The images obtained can be used for both machine analysis and observation by the human eye.
 
This is why SONY introduces two CMOS image sensors: IMX324 (RCCC) and IMX424 (RCCB) for application in high-end driver assistance systems to greatly improve the accuracy of such systems.
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