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  • SD, HD and Full HD in security monitoring


        Over the past few years, to promote the consumer electronics market, coupled with the CRT TV is LCD and plasma TV screens change, HDTV has achieved great success. As the field of video surveillance is now also began to adopt HDTV, monitoring of SD, HD and full HD concept is basic to follow some of the high-definition television called. Compared to analog CCTV systems, high definition means that the excellent image quality. We all hype the concept of HD, we usually more than D1 (704 * 576) resolution called HD, is not true, D1 is only standard-definition resolution. We now look at what is SD, HD and Full HD. Monitor the efforts of the manufacturers believe that through the the Aip Star and a number of high-definition video in the near future, HD will be spread throughout the security monitoring market.
        SD
        The so-called standard definition, is the physical resolution less than 720p (1280 * 720), a video format. 720p refers to the video´s vertical resolution of 720 lines progressive scan. Specifically, refers to the resolution of about 400 lines, VCD, DVD, TV programs and other "standard definition video formats, that is the standard definition. The physical resolution above 720p claimed as high-definition (English expression HighDefinition) for short of HD. HD standard, internationally recognized, there are two: video vertical resolution than 720p or 1080i; video side of leniency than a 16:9.
        HD
        First of all from the division of "HD" and "SD" can see the video effect. Bandwidth occupied by the transmission of image quality and channel, digital TV signal is divided into the HDTV (high definition television) and SDTV (standard definition television) and LDTV (standard definition TV). HDTV specifications from the visual point of view, its image quality can be at or near the level of the 35mm wide-screen film, which requires that the video content and display device horizontal resolution of more than 1000 lines resolution up to 1920 × 1080. From a quality point of view, due to the high-definition resolution is basically the equivalent of four times that of traditional analog TV picture clarity, color reproduction, should be far better than traditional TV. 16:9 widescreen display can also bring a broader visual enjoyment. From audio effects to see high-definition TV programs will support Dolby 5.1 surround sound, high-definition video programs support Dolby 5.1TrueHD specifications, this will bring us to the listening enjoyment of super shocking.
        Due to cost constraints, high-definition video surveillance industry has not been effectively applied. And now the development of chip technology and compression algorithms, high-definition video surveillance products gradually on the rise. D1 standard definition video compression format has been formally written into the national standards of the Digital Video Recorder System (DVR). View the video surveillance industry, the market has been commercially available standards-based H.264 HD network camera (HD IP Camera) and video server products, clarity can often be 720P but the frame rate is usually only 15FPS and can not achieve real-time video monitoring purposes. AipStar company has a 720P HD one megapixel IP camera based the standard H.264MainProfile compression algorithm, clearer images can be shed in the lower yards. It supports 30FPS 720P real-time dual-stream video coding, high-definition, real-time, dual-stream, with the SD card and USB recording function, support Wifi wireless support YPbPr HD video analog output, has a higher cost.
        FULLHD Full HD
        Full HD (FULL HD) refers to the physical resolution up to 1920 × 1080 (1080i and 1080P), where i (interlacing) refers to interlaced scanning; P (Progressive) on behalf of the progressive scan, both on the screen a great difference in the fineness 1080P picture quality is better than 1080i.
        Corresponding to 720 known as standard definition. Obviously, richer data in the transmission process, so the resolution on the 1080 in an advantage, especially on the big screen television, 1080 to ensure a clearer picture quality. Cost and other reasons FullHD products are now rarely used in the monitoring system, usually only in some high-end applications.
        Five times the resolution of HDTV resolution up to standard analog TV. HDTV also has better color fidelity and 16:9 format. SMPTE (American Film and Television Engineers) defined the two most important HDTV standard SMPTE 296M and SMPTE 274M.
        SMPTE 296M (HDTV 720P) defined resolution of 1280x720 pixels, 16:9 format, color fidelity, 25/30Hertz (Hz) sequential scan frequency, that is 25-30 frames per second, based on country-specific, and also supports 50 / 60Hz scanning frequency (50/60) per second.
        SMPTE 274M (HDTV 1080) defined the resolution of 1920x1080 pixels, 16:9 format, color fidelity, the use of 25/30Hertz (Hz) and 50/60Hz interlaced or sequential scan frequency.
        SMPTE-compliant IP camera to comply with HDTV quality, and should provide all the HDTV resolution, color fidelity and frame rate advantages. HDTV based on square pixels, similar to the computer screen, HDTV video from network video products can either be displayed on HDTV screens can also be displayed on a standard computer monitor. Sequential scan HDTV video when the video will be computer processed or displayed on a computer screen, does not require application of the conversion or de-interlacing technology.

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