In the past few years, with the promotion of the consumer electronics market and the shift of CRT TVs to liquid crystal and plasma TV screens, HDTV has achieved great success. With the video surveillance field now also using HDTV, the definition of SD, HD and Full HD in the surveillance basically follows some of the names of HDTV. Compared with analog CCTV systems, high definition means excellent image quality. At present, everyone is speculating on the concept of high-definition. Before, we usually called D1 (704 * 576) or more resolutions in high resolution. In fact, D1 is only the resolution of standard definition. Let's take a look at what is SD, HD and Full HD. Believe that through the efforts of AipStar and many high-definition video surveillance vendors, in the near future, high-definition will popularize the entire security monitoring market.
SD
The so-called standard definition is a video format with a physical resolution below 720p (1280*720). 720p refers to the video's vertical resolution of 720 lines of progressive scanning. Specifically, it refers to standard-definition video formats such as VCD, DVD, and TV programs with a resolution of about 400 lines. The physical resolution of more than 720p is called HD, (English expression HighDefinition) referred to as HD. With respect to HD standards, there are two internationally recognized standards: video vertical resolution exceeds 720p or 1080i; video aspect ratio is 16:9.
HD
The division of "HD" and "SD" first comes from the video effects that can be seen. Due to the difference in image quality and the bandwidth occupied by channel transmission, digital television signals are classified into HDTV (High Definition Television), SDTV (Standard Definition Television), and LDTV (Ordinary Definition Television). From the visual effects, HDTV has the highest specification, and its image quality can reach or approach the level of a 35mm widescreen movie. It requires the horizontal resolution of video content and display equipment to reach over 1000 lines with a resolution of up to 1920×1080. Judging from the picture quality, because the definition of high-definition is basically equivalent to 4 times that of the traditional analog TV, the picture definition and color reproduction degree are far better than the traditional TV. The 16:9 widescreen display also brings wider visual enjoyment. From the perspective of audio effects, high-definition television programs will support Dolby 5.1-channel surround sound, and high-definition movie programs will support the Dolby 5.1 TrueHD specification, which will give us a super shocking enjoyment of hearing.
Due to cost constraints, HD has not been effectively applied in the video surveillance industry. With the development of chip technology and compression algorithms, high-definition video surveillance products are gradually emerging. The D1 standard-definition video compression format has now been officially written into the National Digital Video Recording System (DVR) national standard. From the point of view of the entire video surveillance industry, there are commercial H.264-based HD IP Cameras and video server products currently on the market, and the resolution can usually reach 720P. However, the frame rate is usually only 15 FPS or less and cannot achieve real-time video. The purpose of monitoring. AipStar has a 720P HD megapixel network camera, based on the standard H.264 MainProfile compression algorithm, which enables a clearer picture at a lower code rate. It supports 30FPS 720P real-time dual-stream video encoding, high-definition, real-time, dual stream, with SD card and USB video recording capabilities, support Wifi wireless, more support YPbPr high-definition video analog output, with a higher price.
FULLHD Full HD
The so-called full HD (FULLHD), refers to the physical resolution up to 1920 × 1080 display (including 1080i and 1080P), where i (interlace) refers to interlaced scanning; P (Progressive) represents progressive scan, both in the fine picture There is a big difference in the degree, 1080P picture quality is better than 1080i.
Correspondingly, 720 is called standard HD. Obviously, because the data information is more abundant in the process of transmission, 1080 has more advantages in resolution, especially in the large-screen TV, 1080 can ensure a clearer picture quality. Due to cost and other reasons, FullHD products are still rarely used in surveillance systems, usually only in some high-end applications.
HDTV resolution up to 5 times the standard analog TV resolution. HDTV also has better color fidelity and 16:9 format. The two most important HDTV standards defined by SMPTE (Society of Motion Picture and Television Engineers) are SMPTE296M and SMPTE274M.
SMPTE296M (HDTV720P) defines resolution of 1280x720 pixels, high-fidelity color in 16:9 format, 25/30 Hertz (Hz) sequential scanning frequency, ie 25-30 frames per second, depending on country, also supports 50/60Hz Scan frequency (50/60 frames per second).
The SMPTE274M (HDTV1080) defines a resolution of 1920x1080 pixels, high-fidelity color in 16:9 format, using 25/30 Hertz (Hz) and 50/60 Hz interleaved or sequential scan frequencies.
Cameras that comply with the SMPTE standard are said to comply with HDTV quality and should provide all HDTV resolution, color fidelity, and frame rate advantages. HDTVs are based on square pixels and are similar to computer screens, so HDTV video from network video products can be displayed on either an HDTV screen or a standard computer monitor. With sequential scanning of HDTV video, no conversion or de-interlacing techniques are applied when the video will be processed by a computer or displayed on a computer screen.
SD
The so-called standard definition is a video format with a physical resolution below 720p (1280*720). 720p refers to the video's vertical resolution of 720 lines of progressive scanning. Specifically, it refers to standard-definition video formats such as VCD, DVD, and TV programs with a resolution of about 400 lines. The physical resolution of more than 720p is called HD, (English expression HighDefinition) referred to as HD. With respect to HD standards, there are two internationally recognized standards: video vertical resolution exceeds 720p or 1080i; video aspect ratio is 16:9.
HD
The division of "HD" and "SD" first comes from the video effects that can be seen. Due to the difference in image quality and the bandwidth occupied by channel transmission, digital television signals are classified into HDTV (High Definition Television), SDTV (Standard Definition Television), and LDTV (Ordinary Definition Television). From the visual effects, HDTV has the highest specification, and its image quality can reach or approach the level of a 35mm widescreen movie. It requires the horizontal resolution of video content and display equipment to reach over 1000 lines with a resolution of up to 1920×1080. Judging from the picture quality, because the definition of high-definition is basically equivalent to 4 times that of the traditional analog TV, the picture definition and color reproduction degree are far better than the traditional TV. The 16:9 widescreen display also brings wider visual enjoyment. From the perspective of audio effects, high-definition television programs will support Dolby 5.1-channel surround sound, and high-definition movie programs will support the Dolby 5.1 TrueHD specification, which will give us a super shocking enjoyment of hearing.
Due to cost constraints, HD has not been effectively applied in the video surveillance industry. With the development of chip technology and compression algorithms, high-definition video surveillance products are gradually emerging. The D1 standard-definition video compression format has now been officially written into the National Digital Video Recording System (DVR) national standard. From the point of view of the entire video surveillance industry, there are commercial H.264-based HD IP Cameras and video server products currently on the market, and the resolution can usually reach 720P. However, the frame rate is usually only 15 FPS or less and cannot achieve real-time video. The purpose of monitoring. AipStar has a 720P HD megapixel network camera, based on the standard H.264 MainProfile compression algorithm, which enables a clearer picture at a lower code rate. It supports 30FPS 720P real-time dual-stream video encoding, high-definition, real-time, dual stream, with SD card and USB video recording capabilities, support Wifi wireless, more support YPbPr high-definition video analog output, with a higher price.
FULLHD Full HD
The so-called full HD (FULLHD), refers to the physical resolution up to 1920 × 1080 display (including 1080i and 1080P), where i (interlace) refers to interlaced scanning; P (Progressive) represents progressive scan, both in the fine picture There is a big difference in the degree, 1080P picture quality is better than 1080i.
Correspondingly, 720 is called standard HD. Obviously, because the data information is more abundant in the process of transmission, 1080 has more advantages in resolution, especially in the large-screen TV, 1080 can ensure a clearer picture quality. Due to cost and other reasons, FullHD products are still rarely used in surveillance systems, usually only in some high-end applications.
HDTV resolution up to 5 times the standard analog TV resolution. HDTV also has better color fidelity and 16:9 format. The two most important HDTV standards defined by SMPTE (Society of Motion Picture and Television Engineers) are SMPTE296M and SMPTE274M.
SMPTE296M (HDTV720P) defines resolution of 1280x720 pixels, high-fidelity color in 16:9 format, 25/30 Hertz (Hz) sequential scanning frequency, ie 25-30 frames per second, depending on country, also supports 50/60Hz Scan frequency (50/60 frames per second).
The SMPTE274M (HDTV1080) defines a resolution of 1920x1080 pixels, high-fidelity color in 16:9 format, using 25/30 Hertz (Hz) and 50/60 Hz interleaved or sequential scan frequencies.
Cameras that comply with the SMPTE standard are said to comply with HDTV quality and should provide all HDTV resolution, color fidelity, and frame rate advantages. HDTVs are based on square pixels and are similar to computer screens, so HDTV video from network video products can be displayed on either an HDTV screen or a standard computer monitor. With sequential scanning of HDTV video, no conversion or de-interlacing techniques are applied when the video will be processed by a computer or displayed on a computer screen.
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