"Troika" to promote the development of millions of HD IP Camera

"Troika" to promote the development of millions of HD IP Camera
Millions of HD IP Camera technology development mainly depends on three components: megapixels lens, megapixel sensor, and compression processing chip. "Ordinary network cameras or megapixels camera products, really basic, core sensor technology breakthroughs and codec technology innovation, image effects, and appropriate light is the eternal theme," into megapixels level, The only lens, sensors and chips are a good match, and with the constant evolution of the transmission technology and bandwidth, users can get a crisp and clear image effect, the practical value.
Megapixel lens
Era in video surveillance megapixels, megapixels of camera inevitable with the need megapixels level light, which is bound to the birth of matching megapixels lens. Millions of pixels corresponding lens can better match megapixels sensor for a sharper image of the focal length of TAMRON, Computar, FUJINON, Xiamen leadingoptics, Fujian Fu Guang manufacturers have different specifications of megapixels lens launched. Tamron developed in 2007 three different focal length corresponding megapixels manual zoom lens, fixed installation needs the KOWA for 300 million -500 million pixel camera, 3.5-10mm ,10-20 lens megapixels launch the corresponding lens. Megapixels lens design, assembly process, and processing accuracy higher technical requirements, which, compared to the network camera manufacturers, lens technology rather slow.
CCD and CMOS dispute
Photosensitive device is the most central part of the camera, analog cameras as well as standard definition IP Camera, the most widely used is the CCD, but with the emergence of millions of HD IP Camera, high-resolution progressive scan, progressive scan CMOS sensor the interlaced CCD chip advantage, it sequentially scanning each television line, instead of the television lines are divided into even and odd lines and then superimposed into a pair of complete image. Interlaced, fast-moving objects in the odd field scans and even field scanning position there is a big difference, resulting in blurred images, transportation and other areas, a greater need for clear and non-serrated moving vehicle image The CMOS pixel density to make it stable, according to a place. Currently, 1.3 million network camera followed the analog advantage, more use of the CCD, 200 million or more network cameras are more inclined to CMOS. CCD is characterized by high sensitivity, response speed, CMOS In addition to the advantage of pixel intensity, cost and power consumption advantages more manufacturers of all ages, its shortcomings is that more noise in low light or dark environment, If you do not fill light measures can not achieve the desired effect at night.
CMOS in the case of higher pixel cost is lower than CCD, but the image quality point of view, the CCD will be better than the CMOS image quality, depending on whether the manufacturers prioritizing image, Panasonic's 300-megapixel network camera with is a CCD sensor. this, "CCD and CMOS is more around a cost-competitive, and the balance between the image quality is necessary to ensure a relatively good image quality, while a relatively low price, Zhejiang Dahua Co., Ltd. Product Manager the Wang Xiongjun says. It is understood that the current market is committed to the CMOS research vendor has developed a dedicated 720P and 1080P CMOS devices, its the sensitivity performance has been close to the CCD. CCD and CMOS in different application scenarios, have their own advantages, but with the CMOS process and the technology continues to improve, as well as the continuous decline in prices of high-end CMOS, CMOS future will be digital IP cameras (IPC), the main light-sensitive components will inevitably replace the CCD. "
Compression processing chip technology
Megapixel IP camera video data is very large, and require a higher compression chip and CPU processing power. To obtain a clear image, in addition to the lens and the sensor, including image compression resolution and frame rate. The chip compression processing ability to directly determine the transmission network, the video storage and the requirements of the back-end processing is also significantly influenced the quality of the image. The higher the sharpness of the image, the greater the bandwidth usage. Currently, the processing power of the chip is mainly reflected in the resolution, low bandwidth stream applications.
ACTi, Axis, Panasonic, Sony and other manufacturers have a strong R & D capabilities, the chips are based on the practical application of independent development. Panasonic focus on high quality, independent research and development of video processing chip plasma TVs and other digital products will be used in the technical and cost advantage, function and performance can be guaranteed, and can be formed with other manufacturers difference competition. "talk about autonomy chip R & D, Panasonic Zheng Qiang think so. Hass, TI, and liters step chip chip manufacturers have launched to meet the needs of millions of HD IP Camera chip. Hisilicon million HD Network Camera developed third-generation monitoring solution - Hi3515 Hi3520, TI's DSP DaVinci Hikvision, Dahua and other manufacturers using existing liter step GM8120 and GM8161 million HD IP Camera program, a new generation of built-in image processing chip is expected to be available next year.
To achieve good image quality, in addition to the front end of the lens, sensor processing, image processing part of the light part of the millions of HD Network Camera can not be ignored. Typically, the sensor portion embedded image processing chip to handle some of the more simple function, auto exposure, auto white balance proofreading and automated features such as focus must be processed by the back-end ISP chip to get a good image. Chip process of many years of development, we find millions of HD IP Camera front-end sensor to collect more light information, how to deal with and take advantage of this information, to restore low light or complex light source images, improved dynamic range and color performance, smart computing, For complex SOC chip and powerful technology and experience, and ultimately to produce good image quality. "
Megapixel IP camera is widely used in image compression technology have M-JPEG/MPEG-4/H.264 three ways, each compression have different characteristics, M-JPEG to FRAME highest quality , but lower compression efficiency, maximum occupied bandwidth; H.264 can get the highest compression ratio, processing platform for the highest demands of the camera itself. In order to obtain a higher resolution and to achieve full real-time transmission, mainstream manufacturers are using H.264 compression algorithm to achieve low bandwidth. 720P picture quality is not the only goal to be pursued to achieve a smooth high-definition picture in low bit stream, to be able to meet the basic needs of various industries for high-definition video, ACTi Chen Dong. It is understood that the mainstream manufacturers chip compression, the compression ratio can be achieved 720P @ 2 ~ 4Mbps25 frame full real-time transmission status 2Mbps the bit rate, there is another meaning, D1 (720x480) quality DVR storage stream 2Mbps-based, which means that the user can choose case without a substantial increase in network and storage costs 720P network camera.
Megapixels network camera must be implemented in practical applications, multi-stream applications, network cameras outside the local monitoring of the demand for remote management megapixels local high-definition transmission, the need to a low stream of data, to remote backup key images, key frames, the key video data. At present, the high-end market megapixels network cameras are equipped with a powerful M-JPEG/MPEG-4/H.264 encoding engine, with a flexible dual-stream design appropriate solutions according to the needs of users . 720P full real-time transmission according to the actual situation, under normal circumstances, only the ordinary resolution to transmit real-time images (D1), a high-resolution JPEG transmitted in the form of high-resolution images in the alarm condition occurs, order afterwards to enlarge, which is usually smaller transmission occupied bandwidth real-time image transmission at a critical time image quality is good, but take up a large network bandwidth high-definition images for clear details.
From:http://www.vstarcam.com/channel/-Troika-to-promote-the-development-of-millions-of-HD-IP-Camera-110.html