Back-illuminated CMOS sensor performance and development of IP Camera

Back-illuminated CMOS sensor performance and development of IP Camera
Current digital technology , the rapid development of semiconductor manufacturing technology and networks , market digital products and then grow at an alarming rate , the composition of the video , audio-visual products, key components of the image sensor (Sensor) has become the object of the current and future industry focus . There CCD image sensors and CMOS two chips , but in our current HD security surveillance , both chips have applied technology .
Development and application of image sensor
The eyes are the source of the human visual image , and the image sensor is a video capture device image receiving device . The image sensor according to morphological classification in general there are two types : linear image sensor , image sensor surface . Linear image sensor is used in scanners, copiers , fax machines and other devices. The face image sensor is widely used in our well-known security monitoring network camera , cell phone camera , car reversing video cameras, tablet PCs and other products.
We just said, a CCD image sensor chip with two CMOS. Early on, we usually think of excellent image quality CCD sensor devices are used , and low-cost products use CMOS sensors. However, the new CMOS chip technology has overcome the technical weaknesses early CMOS sensor , compared to the old products designed to enhance the low light performance of the sensor , the exposure mode. Take the popular back-illuminated CMOS sensor , in the conventional CMOS image sensor, located behind the light-sensitive diode circuit transistor , the light will pass between the microlens and photodiode circuits and transistors, it will be due to the amount of light blocked and affected.
Back-illuminated CMOS sensor on the internal structure of the original image sensor optimized , the original will photosensitive layer reverses direction , so that direct light from the back to increase the amount of light into the chip, so back-illuminated CMOS image sensors than conventional CMOS the sensitivity of the sensor on the photosensitive qualitative leap in low-light environments , the use of back-illuminated CMOS sensor HD IP Camera has been a great performance in the ability to focus , image quality performance , image noise control and other aspects .
Back-illuminated CMOS image sensors , etc. In addition to excellent low-light performance , but also has high sensitivity and better noise control performance. That after the ISO increased much less noise than CCD . This is a great advantage in low light image capture environment, high frame rates and better performance .
Back-illuminated CMOS sensor chips are often high-speed , large -chip support full HD quality frame rate of 60 frames per second or higher image output , and in this regard CCD sensor more difficult. Now the mainstream adoption of back-illuminated CMOS sensor network camera mostly support 1080P @ 30fps full HD video or 720P @ 60fps. And our common CCD sensor camera can only 720p @ 25fps, support 1080P format CCD sensor is too costly . Back-illuminated CMOS sensor pixel can be higher.
Although both the back-illuminated CMOS or CCD, can increase the effective pixels. However, back-illuminated CMOS sensor structure determines the area under the same circumstances , you can further enhance effective pixels , the picture quality can be maintained quite well . In contrast to blindly increase the pixel CCD , it will be poor quality , and with improved pixel , the chip size is also larger cause costs to rise geometrically .
CCD sensor manufacturing process is more complex, with CCD sensor camera prices are relatively high. In fact, after transformation , the current gap between CCD and CMOS practical effect has been reduced a lot. And CMOS chip manufacturing cost and power consumption must be much lower than the CCD, so a lot of network cameramanufacturers use CMOS image sensors. Imaging : In the same pixel CCD imaging permeability, very good sharpness , color reproduction , exposure can guarantee basic accuracy .
The permeability of CMOS products are currently the general picture of the kind of color reproduction capability is weak, exposure mode using the Rolling Shutter mode due mostly caused by the presence of fast moving objects sensor distortion problem when capturing , CMOS and CCD imaging sensor in the picture quality more stringent quality requirements of the scene or a certain distance. However, due to low prices and high level of integration , so the increasingly rapid development of high-definition camcorder market is still widely used.
The latest research results of the image sensor
2012 CMOS image sensors favored by the market over the last important reason is that the problem is much lower than the sensitivity of the CCD sensor due to the use of new technologies, such as back-illuminated CMOS, gradually resolved. Compared to the CCD sensor , CMOS sensor has a better mass productivity , and easy to implement other logic circuit comprising including SoC (System on Chip) products, which is difficult to achieve in the CCD chip.
In particular, unlike the CCD chip is a CMOS sensor that requires special manufacturing process, and therefore can be used directly for DRAM and other high-volume production equipment. As a result , CMOS image sensors is likely to form a completely different cost structure of the CCD image sensor , but also for highly integrated CMOS sensor has opened up a new direction . The early market once launched CMOS sensor comes ISP processor , containing 2A (AE, AWB) control algorithm. The development so far , such a product very welcomed and favored by the market .
Many do not have the ISP image processor / ISP algorithm research and development capabilities of small businesses can use the built- 2A processing CMOS sensor to produce high-definition video camera. The traditional definition cameras architecture, front to back is generally divided into several components : an image sensor SENSOR, ISP image sensor , compression / signal conversion process ; ISP if using the integrated CMOS sensor , the middle part of the realization of the use FPGA chip ISP unit can be eliminated , so that not only effectively reduce the overall BOM cost devices , and bypass the ISP algorithm development threshold. Currently on the market price relatively cheap 720P HD IP Camera mostly use such programs .
Manufacturers have recently introduced a wide dynamic integrated Real WDR HD frame-level back-illuminated CMOS sensor , and before the integration of CMOS SENSOR 2A different functions , this product uses a frame-level sensor manufacturers skilful wide dynamic technology. We know, for high-definition video camera image processing , especially ISP relies in part on more than just research and development, but also rely on image processing for debugging rich accumulated experience. Then comes a frame-level features wide dynamic back-illuminated CMOS sensor products will not only enhance the dynamic range of the sensor to 120dB or more, but also for the camera manufacturers save R & D investment .
This ISP in addition to the integration of image processing of the image sensor , an integrated compression future market is one of the direction of the image sensor . The core components of the camera is a highly integrated future trends , which have benefited from the CMOS sensor has better production , but also easy to implement architectural features include other logic circuits.

From: http://www.vstarcam.com/channel/Back-illuminated-CMOS-sensor-performance-and-development-of-IP-Camera-403.html
Smart Home Plug Play IP Camera IP Network Camera P2P IP Camera HD IP Camera IP Camera Network Camera IP Network Camera Eye4 Baby Eye4 IP Camera Baby Monitor Camera Baby Monitor Baby Monitor IP Camera Eye4 Smart Cloud Wireless IP Camera Wired IP Camera HD IP Camera Outdoor IP Camera Indoor IP Camera