What is SD, HD, and full HD in monitoring?

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In the past few years, HDTV has achieved great success thanks to the promotion of the consumer electronics market and the positive transformation of CRT TVs into LCD and plasma TV screens. With the use of HDTV in the video surveillance field, the definition of SD, HD, and full HD in monitoring basically follows the definition of HDTV. Compared with analog CCTV systems, HD means superior image quality. At present, everyone is hyping on the concept of HD. Previously, we usually called the resolution above D1 (704*576) As hd. In fact, it is not the case that D1 is only a standard resolution. Now let's take a look at what is SD, HD, and full HD. I believe that through the efforts of aipstar and many high-definition video surveillance manufacturers, in the near future, HD will popularize the entire security monitoring market.

SD

SD is a video format with a physical resolution of less than 720 p (1280*720. 720 p indicates that the video's vertical resolution is lines by line scanning. Specifically, it refers to the "SD" video formats, such as VCD, DVDs, and TV programs with a resolution rate of about 400 lines, that is, standard definition. When the physical resolution reaches P or more, it is called HD, or HD for short. There are two internationally recognized high-definition standards: the vertical resolution of videos exceeds P or I, and the ratio of video width to height is 16: 9.

HD

The division of "HD" and "SD" comes first from the video effects that can be seen. Due to the different bandwidth occupied by image quality and channel transmission, digital video numbers are divided into HDTV (High Definition TV), sdtv (standard definition TV), and ldtv (normal definition TV ). From the perspective of visual effects, HDTV has the highest specifications, and its image quality can reach or close to 35mm wide screen movies. It requires that the horizontal resolution of video content and display devices reach more than 1000 lines, resolution up to 1920x1080. In terms of image quality, since the resolution of high definition is basically four times that of traditional analog TVs, the image definition and color restoration are far better than those of traditional TVs. At, the wide screen display also gives you a wider visual experience. From the audio effect, hd TV programs will support Dolby 5.1 sound loop, while HD video programs will support Dolby 5.1truehd, which will bring us an amazing sense of hearing.

Due to cost restrictions, HD has never been effectively applied in the video surveillance industry. Nowadays, with the development of chip technology and compression algorithms, HD video surveillance products are gradually emerging. Currently, the D1 SD video compression format has been officially written into the Digital Hard Disk Video Recording System (DVR) national standard. From the perspective of the video surveillance industry as a whole, there are now commercial standards based on H. 264 HD Network Camera (hdipcamera) and Video Server products, the definition can usually reach P, but the frame rate is usually less than 15 FPS, cannot achieve the purpose of real-time video monitoring. Aipstar has a p high-definition megapixel Network Camera. Based on the standard h.20.mainprofile compression algorithm, it can achieve clearer image effects under lower code streams. It supports 30fps P real-time dual-stream video encoding, HD, real-time, dual-stream, SD card and USB video recording, WiFi wireless, and ypbpr HD video analog output, high cost effectiveness.

Llhd Full HD

Full HD (fullhd) refers to the physical resolution up to 1920 × 1080 display (including 1080i and 1080 p), where I (interlace) refers to the line scan; P (progressive) this is a line-by-line scan. The two have a big difference in the fineness of the screen. The quality of P is better than that of I. Correspondingly, 720 is called standard high definition. Obviously, because the data information in the transmission process is more abundant, 1080 has more advantages in resolution, especially in the aspect of Large Screen TV, 1080 can ensure a clearer picture quality. Due to cost and other reasons, fullhd is currently rarely used in the monitoring system, usually only in some high-end applications.

The resolution of HDTV is up to 5 times that of the standard analog TV. HDTV also has better color fidelity and 16-9 format. The two most important HDTV standards defined by SMPTE are smpte296m and smpte274m.

The resolution defined by smpte296m (hdtv720p) is 1280x720 pixels, a high fidelity color in the 16:9 format, and a 25/30 hertz (HZ) Sequential Scan Frequency, that is, 25-30 frames per second, depending on the country, it also supports 50/60Hz scan frequency (50/60 frames per second ).

Smpte274m (hdtv1080) defines a resolution of 1920x1080 pixels, a high fidelity color in the 16:9 format, with a 25/30 hertz (HZ) and 50/60Hz staggered or Sequential Scan Frequency.

A camera that complies with the SMPTE standard indicates that it complies with the HDTV quality and shall provide all resolution, color fidelity, and frame rate advantages of HDTV. HDTV is based on square pixels and is similar to a computer screen. Therefore, HDTV videos from network video products can be displayed on both the HDTV screen and the standard computer monitor. HDTV videos are scanned sequentially. When a video is processed by a computer or displayed on a computer screen, no conversion or anti-crossover technology is required.