The so-called standard definition is a video format with a physical resolution below 720p. 720p refers to the vertical resolution of the video is 720 line progressive scan. Specifically, it refers to a "standard definition" video format such as VCD, DVD, and TV programs with a resolution of about 400 lines, that is, standard definition. The physical resolution of 720p or more is called HD, (High Definition of English) is referred to as HD. Regarding the standard of high definition, there are two internationally recognized: the vertical resolution of the video exceeds 720p or 1080i; the aspect ratio of the video is 16:9.
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The division of "HD" and "SD" comes first from the video effects that can be seen. Due to the difference in image quality and bandwidth occupied by channel transmission, digital television signals are classified into HDTV (High Definition Television), SDTV (Standard Definition Television), and LDTV (Normal Definition Television). From the visual point of view, HDTV has the highest specification, and its image quality can reach or approach the level of 35mm wide screen movie. It requires video content and display equipment with a horizontal resolution of more than 1000 lines and a resolution of up to 1920×1080. From the picture quality point of view, because the resolution of HD is basically four times that of traditional analog TV, the picture clarity and color reproduction are far better than traditional TV. The 16:9 widescreen display also brings a wider visual enjoyment. In terms of audio effects, HDTV programs will support Dolby 5.1 surround sound, while HD movie programs will support the Dolby 5.1 True HD specification, which will give us a superb listening experience.
In fact, "HD" and "SD" cannot be simply compared. They are just two different video formats. They can all load video signals of different quality, so the actual quality has a lot to do with the quality of the loaded video signal. This is equivalent to water tanks and tea cups. The tank can hold a large tank of water or just a glass of water. When you only have a glass of water, you can't say that it has more water than a cup of water in the cup.
The so-called Full HD (FULL HD) refers to physical resolution up to 1920 × 1080 display (including 1080i and 1080P), where i (interlace) refers to interlaced scanning; P (Progressive) represents progressive scanning, both in the picture There is a big difference in fineness, and the 1080P quality is better than 1080i. Correspondingly, 720 is called standard high definition. Obviously, 1080 has more advantages in resolution due to the richer data information during the transmission process, especially in the large-screen TV, 1080 can ensure a clearer picture quality.
UHDTV is the abbreviation of (Ultra High Definition Television), which stands for "Ultra HDTV" and is the next generation technology of HDTV. In May of this year, the International Telecommunications Union (ITU) issued a proposal for the "Ultra HDTV" (or "Ultra HDTV") standard, which is called TV with a physical resolution of 3840×2160 (4K×2K) and above. For ultra high definition TV. This technology has higher resolution than HDTV (High Definition Television), a larger viewing angle, and a stronger visual impact, which solves the problem that the large-screen TV details are lost and cannot be truly restored.
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