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  • HD surveillance cameras installation and control skills

        General security monitoring system installed on HD surveillance cameras and camera installation and commissioning method is basically the same, but will need to pay attention to the matching of a good lens, the quality of the lens or matching is not good, will largely affect picture clarity, such as infrared night vision camera the best selection of infrared lens, 1/3 inch CCD generally equipped with 1/3 inch lens, 1/2 inch CCD is generally equipped with 1/2 inch lens. Install debugging lens focus debugging requirements must be fine, especially the alignment of the camera focal plane, a lot of time focusing of the lens is unclear will cause the image of a trance, reach clear.

        The protective cover of another camera can not be ignored, the front end of the gun shield glass can not be generally flat glass, and necessary to the adoption of better optical glass, generally flat glass image resolution of a very powerful weaken the role of selection The ball casing should be more aware, spherical curvature necessary for the transition smooth, and best not to put the lens on the edge of the spherical shell, here light refraction, even the severe impact of the image is clear. It is important to Either the casing, the best light as low as possible within the casing, the lens to the casing of the interval as short as possible, so that the front of the camera light pollution reduced to a minimum, progress images of clarity.

        HD surveillance cameras necessary for high-definition

        High clear camera in addition to the front-end installation and selection is necessary to pay attention to the outside, but also required transmission systems, intermediate systems and end-system used in conjunction in order to achieve clarity, the actual effect.

        Transmission of video images for high-definition surveillance camera systems, will generally choose the way of the coaxial cable, twisted pair, UTP cable (network transmission), wireless transmission, cable transmission, either way transmission necessary to make the image from really the entire system bandwidth of each ring then the front end transmission to> 6M, so as to ensure that the image to achieve the requirements of clarity and in line with the requirements of engineering and technical and anti-detection.

        Coaxial cable over 150 meters or 200 meters under normal circumstances, the image quality will be significantly decreased, which is caused by the characteristics of the coaxial cable itself, it is necessary to take various measures to ensure their end bandwidth is not less than 6M, if necessary, to given to add video compensation amplifiers to resolve the role of the video amplifier. Indicators of their compensation should ensure that high-frequency compensation amount, amplitude-frequency characteristics, clenching the signal-to-noise ratio, common mode, differential phase distortion and chroma-luma delay and width of the chroma gain and so achieve the relevant cable loss or attenuation caused defects to be compensated for, thus ensuring the high clarity of the image into the system.

        Currently, copper prices are rising, the capital of the video image using fiber optic cable transmission is declining, the use of optical fiber transmission may well be fully staffed programs are widely used in the transmission of a longer interval or more images. Because of the large bandwidth of fiber optic cable, attenuation, high noise immunity, small size,confidentiality, and other characteristics can better ensure the indicators of the image transfer. When other means of transmission images, you must also ensure that the bandwidth of the channel.

        The high clarity of the image is also necessary to rely on good device performance in front of the human visual terminal display, it is the best choice for progressive scan supervisor. Interlaced image of the supervisor in the actual use of flashing grim, easily gives rise to visual fatigue. If the supervisor of clarity is also less than the overall clarity of the requirements. Due to the clarity of the supervisor by the supervisor, the bandwidth of the video channel and the CRT dot pitch away from the decision.

        According to statistics, the channel bandwidth and clarity between the translated theory ceiling 1M/80 line about, if we consider the video signal amplitude decline in clarity when to display 400 lines of video images, the supervisor is clearly degree index of thumb should be using the machine more than 600 lines. Order to make the HD camera system can be used normally, the middle of processing equipment, including matrix, DVR, video server, a variety of video encoders, etc. must be content with the bandwidth and image compression in order to make the high clear camera into full play its inherent role. Alone to the neglect of other supporting equipment used is less than the real purpose of high clarity camera.

        Followed by the rapid development of the industry, the needs of users, high-definition infrared camera function and parameters will be increasingly high, and the requirements of the monitoring system will be more stringent.

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