CCD
The sharpness index used to describe the CCD sensor is the effective pixel in the horizontal direction of the CCD sensor. The effective pixels of the two mainstream SD CCDs currently on the market are 510H and 760H, respectively, corresponding to the definition of CIF and D1. Although the horizontal resolution of the camera can be increased from 540 TVL to 560 TVL through ISP optimization, it is still limited to the number of effective pixels of the CCD itself, and still does not reach the 650 TVL required for analog HD. Therefore, to achieve analog HD, the CCD sensor must be used. 960H.
Compared with the 760H, the 960H is increased by 30% on the effective pixels, which is reflected on the video image. Since the horizontal pixels are increased by 570,000 from 440,000, the image details are increased and the image is clearer.
ISP
The main functions of ISP include demosaicing (image interpolation), 3A, gamma correction, image denoising, and wide dynamics. To support analog HD, the ISP must support the 960H CCD to achieve horizontal resolution above 650 TVL.
In addition, in order to adapt to more
Applications, the analog HD ISP has greatly improved the functions of image drying, wide dynamics and so on. The analog high-definition ISP adopts 3D noise reduction technology, and on the basis of the original frame denoising, the function of inter-frame noise reduction is added, and the noise reduction effect is more obvious.
In terms of wide dynamic processing, the analog high-definition ISP also implements the inter-frame wide dynamic technology and increases the wide dynamic range to 120dB (more than 6000 times), which greatly exceeds the original 160-fold wide dynamic effect.
Lens
The camera lens is the most critical device of the video surveillance system, and its quality (indicator) directly affects the camera's overall indicators. In order to meet the definition requirements, analog HD cameras should use megapixel lenses for better results.
Analog HD camera application
From the above technical analysis, we can summarize the characteristics of the analog HD camera as follows:
·Because it is also the output standard CVBS signal, it is fully compatible with the original analog standard definition system. The transmission medium, transmission distance, engineering construction, etc. have not changed. It only needs to replace the analog camera to improve the clarity. If it is equipped with Dahua 960H DVR, not only the sharpness can be increased by 30%, but also has better wide dynamic and low noise effect;
· For the engineering company, the construction method does not need to be changed, no additional training is required, and the original work habits are met;
Page 2: Analog HD camera application
· The analog signals are fully compatible, and it is easy to locate and eliminate in the event of a fault. The network HD system needs to solve the device compatibility problem. In the event of a fault, it is necessary to eliminate complex network problems first;
· The analog HD camera continues the advantages of the simulator system, no coding, no delay, and the image restoration effect is more realistic;
· Cost-effective, Dahua has launched a complete solution of analog HD camera +960H DVR. The code stream is controlled at 2.5M, which is 25% more than D1. For the whole system, with 30% increase in resolution, The analog HD system is less than 20% higher than the D1 standard definition system. With the increasing popularity of analog HD, the cost increase will be reduced to 10%.
Based on the above characteristics of the analog HD camera, the bank business hall monitoring is selected below to illustrate the application of the analog HD camera.
The bank business hall is an important place for financial transfer between banks and customers. The security level is relatively high, and basically all analog video surveillance systems have been installed. In response to the ever-changing external environment, the means and forms of crime, the existing video surveillance has higher requirements, realizes the high-definition and intelligence of video surveillance, and enhances the security capability of the video surveillance system. The monitoring of the banking hall is also a typical wide dynamic and low noise scene, so the requirements for the camera are higher.
The specific monitoring points are deployed as follows:
Outside the business hall: deploy a 700-line analog high-definition infrared camera to achieve day and night monitoring of the external environment of the business hall;
Business hall: deploy 700 line analog high-definition wide dynamic camera or network high-definition camera to achieve clear monitoring of the face of the hall staff, providing powerful image support for real-time monitoring and post-mortem certification;
Business counter: Each window deploys a 700-line analog HD wide dynamic camera to monitor the daily situation of the tellers, standardize operations, and provide service quality;
Internal office area: 700-line infrared dome camera is deployed inside each relatively closed office space to monitor the internal conditions of the office, standardize work, and prevent internal property loss.
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