The prospects of key components of digital surveillance

When the client side and the downstream product market there are always new demands have been proposed, the most critical component upstream will set off a new wave of technologies and applications change. Let us begin by sensitive components (Image Sensor), digital signal processor (DSP / ISP) and the compression chip (Codec) to save part of each study and other components. Current security surveillance industry chain mainly Sensor sensing assembly, DSP / ISP image processing, optical lens-based, and most manufacturers are lacking related components or technology, rely on imports from Japan and South Korea, currently consists of Japanese manufacturers such as SONY,Sharp and Panasonic, Nextchip possession; currently the world’s most manufacturers more focused on the middle reaches, ie high-definition network cameras, surveillance recorders and network storage manufacturing, production and assembly. Stage major security vendors in China fortune in the middle, and gradually grow into with independent research and development capabilities of the brand; most security vendors downstream sales channel of dealers or agents, but SI, engineering companies are the major security vendors sales channels.
In 2012 as a high-definition monitor outbreak years, “HD” and “IP” a well-deserved popular vocabulary. More and more manufacturers to join the field, digital high-definition network camera gradually recognized by customers. Digital security products, intelligent, high-definition and network become an irreversible trend, high-definition surveillance products on the market like bamboo shoots after rain as demonstrated in front of the user. Currently HD IP solutions on the market after another, including Hass, TI, NXP, Nextchip, Intersil, Zhiyuan other chip makers have raised unique HD IP solutions, how to choose a suitable own IP HD component solution become a very concerns, high-definition network camera program has two basic components of architecture. First Image Sensor image sensor chip assembly CCD / CMOS SENSOR as an image capture device, supporting the provision of ISP’s SoC chip, such programs have significant cost advantages, depending on imaging components integrated chip manufacturers ISP (such as 3A , wide dynamic, etc.) effects; using this program a clear advantage is more flexible and can be customized according to program features, such as image capture, low number of sheets control; second is the use of front-end camera sensor chip module ( If PIXIM or Hitachi and SONY’s movement module) as an image capture device, and then supporting ASIC or DSP for encoding and transmission, the relatively high cost of such programs, the use of professional imaging module, the original image is good, so the entire IPC products effect depends on the supporting compression and transmission module is for compressed image clarity and timeliness.
In addition to these two kinds of sensors with the way the framework, for security manufacturers, according to different market requirements and product positioning to choose its own product line with the direction of development solutions, equipment manufacturers to choose programs will consider the following points. Storage and bandwidth Level: image resolution enhancement is bound to consume more bandwidth and storage space. To 1920 × 1080 @ 30fps, for example, the use of the H.264 coding algorithm, in order to ensure clarity, stream around 6Mbps need to control, so the storage space needs hour 2.7GB. In normal LAN environment, 100M transmission bandwidth is only about 10 channels encoded image, even if the 1T hard drive can only store 400 hours. How to balance the storage memory and bandwidth is a problem; lens HD Performance: image resolution enhancement, the lens sophistication put forward new requirements, more than two megapixels ip camera has a resolution of NTSC / PAL standard image ten times even more, while the average high-definition digital camcorder camera DV DC or the technology used on the high cost of high-definition network camera is not conducive to apply. Therefore, how to reduce the threshold of the imaging system, is the development of network and HD camera key component of one of the factors; 3A control technology: In general analog camcorder, the manufacturers of the AF AFC, white balance AWB, AES, etc. 3A automatic exposure control techniques do more perfect, but these technologies in the digital high-definition camcorder HD or IP application is relatively weak, 3A control for high-definition image quality is very important. The component, how to ensure the rapid completion time control algorithm is very important.
In the Sensor’s manufacturing process, the current CMOS obvious advantages, because the same level, the size of the light-sensitive chip, CMOS pixel can be placed in more contrast CCD, is more suitable to be used to develop high-resolution products. And because the CMOS to the pixel distribution in the same plane with the circuit, the circuit to take up most of the space, the real effective photosensitive area of ??less than 50%. So some people are committed to narrowing the development process, so that the line size becomes smaller, the relative enhance effective photosensitive area. That same light-sensitive component performance, CMOS chips using a smaller size can do. CMOS in the cost of materials is also advantageous because CMOS itself can transmit digital signals, you can save the cost of ADC chip, but also to avoid the distortion caused by signal conversion, depletion. There are currently integrated into the CMOS chip digital processing operations (DSP / ISP), graphical interfaces (UI) of some functions such as controller, but also save a lot of material procurement costs. So even single CCD and CMOS same price, but arrived in a multi-chip CMOS energy, cost is relatively higher.

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