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Why does the car camera choose CMOS technology?
Jun 08, 2018

Since car cameras are so important, what are their requirements for technology and technology? For automotive applications, car cameras, like mobile phone cameras, use CMOS instead of CCD as optical sensors. The main reasons are:

First of all, the primary characteristics of sensors used in active driving assistance systems are: speed. Especially in high-speed driving situations, the system must be able to record critical driving conditions, assess such conditions and initiate relevant measures in real time. In essence, CMOS is a faster image acquisition technology—the cells in a CMOS sensor are usually actively controlled and read by three transistors, which significantly accelerates the image acquisition process. Currently, high-performance CMOS-based cameras can reach a level of about 5,000 frames per second.

Second, CMOS sensors also have the advantage of digital image processing. CCD sensors usually provide analog TSC/PAL signals, which may have to be converted using an additional AD converter, or the CCD sensor works with a progressive scan method with digital image output. Either way, the use of CCD cameras to provide digital image signals significantly increases system complexity; CMOS sensors can directly provide LVDS or digital output signals, and components in active driving assistance systems can be directly and without delays. Deal with these signals.

Moreover, in order to achieve this goal, vehicle camera manufacturers must consider the use of lower cost CMOS sensors. In addition, the CMOS sensor does not generate Smear noise that occurs when using a CCD when there is a strong light incident. This will reduce the adjustment time caused by operational errors.

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