What it is?
Format High Definition Video(abbreviated as HD) is new standard video that offers the user higher quality (that is, clarity) of the image by increasing the resolution (number of pixels) on the video image of the playback device (TV, monitor, plasma or LCD panel). Therefore, its more common name is "high definition format" or "high resolution".
What is High Definition Video?
In principle, any video content with a resolution greater than 1280x720 pixels can already be classified as high-definition video. At the same time, this format has its own:
What forms of HD are there?
The HD format is developing in two directions: HDV (High Definition Video), intended for playback from various media, and HDTV- intended for broadcasting on cable, satellite and terrestrial television channels, it is also called HDTV High Definition Television.
What is the resolution?
Today the main ones are: HD1080 (1920x1080) And HD720 (1280x720).
Both of them have a frame (screen) width to height ratio of 16:9.
Also, video with a resolution of 1920x1080 pixels can have progressive scan or interlace alternation of frame fields. And Video with a resolution of 1280x720 only line-by-line interleaving (scanning).
Video formats are also designated accordingly, for example HD1080i - where the letter " i" indicates interlaced alternation of fields, or 720p - where " R"line-by-line alternation.
How many frames per second should there be in HD?
In this regard, high-definition video does not have many differences from DVD video: with line-by-line interleaving of fields in the Pal- 25
frames/second, in NTSC- 30 (29,97)
frames/second; with interlaced alternation of fields in the Pal system 50
half-frames/second, in NTSC- 60
half frames/second.
But in the IVTC Film system everything 24(23.976)
frames, which is a standard for film, thanks to which it is possible to keep the film speed at the original.
What are the advantages of HD video over standard video (SD)?
The HD picture looks more advantageous compared to SD video, plus HD video has a significantly clearer picture on large screens.
The pictures below show a comparison of frames of different formats.
How to play High Definition Video?
You can view HD video in all its glory only on playback devices (Monitors, TV panels, projectors...) that support a screen resolution of at least 1280x720 points.From what media can I watch high-definition video?
The main carriers of HD content are high data density disks, such as Blu-ray. Or view via TV receiver that receives and reproduces TV programs in a HDTV signal.What codec is the HD video signal encoded with?
HD video is encoded in various codecs: MPEG-2 HD- MPEG-2 to DVD receiver. It provides fairly high image quality, but its compression algorithm is very outdated and does not provide a sufficient level of compression. Nevertheless, this format was chosen as the main one for high-definition consumer video systems. And it is no coincidence: it is well known and mastered; complex decoders are not needed to implement the path.
H.264 AVC (MPEG-4 v.10)- a young and promising codec based on the new generation MPEG-4 H.264 codec standard. AVC stands for Advanced Video Coding.
Unlike its older brothers of the h.263 standard (divx, XviD), it demonstrates significantly best quality images with greater path compression, which is associated with the use of significantly improved video data compression technologies. But encoding and decoding a video stream requires significant processor processing power. To ease the load on the processor, renowned video card manufacturers have recently included support for hardware HD video decoding in their new models.
VC-1- developed by MicroSoft and is used to encode HD stream into HD-DVD. It is based on the MPEG-4 algorithm.
DiVX HD And WMV-HD- slightly modified versions of the codecs of their older MPEG4 brothers.
What is Full-HD?
Typically, the Full-HD label indicates that a TV supports full resolution of 1920x1080 pixels.What is HD-Ready?
The HD-Ready label indicates that the TV supports a resolution of less than 1920x1080 pixels, for example, if the TV has a resolution of 1024x768 pixels, then it will be able to show the incoming HD signal, but at the same time it will convert (compress) the image to 1024x768, thereby reducing the clarity of the incoming signal.
The quality of the image on your phone screen depends not only on screen resolution and pixel density
The 2K screen resolution of a smartphone sounds attractive. This is 2560 x 1440 pixels. But is it necessary? Ever since Apple started equipping its devices with Retina Displays and touting image density, many people began to attach great importance to “ppi” (pixels per inch). The higher the pixel density, the sharper the image. But this indicator is far from the only one that affects the quality of the screen. It also happens that the picture on a qVGA display (960 x 540 pixels) looks better than on an HD screen (1280 x 720). And some HD displays are higher quality than others FullHD (1920 x 1080). Why is this happening?
Screen resolution is an important, but not the only factor influencing the quality of a device’s display.
The display parameters affecting image quality were discussed in Vijay Srivastava’s article “HD or FullHD?” published by The Indian Express. Coming To A Resolution On Mobile Screens (Good displays aren’t only about pixels…).” Good display- it's not just pixels!
Display quality mobile phone depends on various factors, not just pixel density. The type of panel used matters. You've seen it more than once - AMOLED, LCD and IPS. The image processor also plays a role, an example of which is the Sony Mobile Bravia Engine. Even the type of scratch-resistant glass also has an effect on the quality of the display. It is this combination of several factors that determines how good an image will look on screen.
Why is there so much talk about pixels?
The reason is simple - there is a dry number and the ability to say: “The more, the better.” The simplest explanation is always the most understandable, but not always accurate enough. To the same extent, in relation to cameras they often talk about the resolution of their matrices (“megapixels”), and not about any other parameters. For this reason, many users mistakenly believe that the higher the “megapixel”, the better camera. Meanwhile .
Similarly, when it comes to displays, the most common rating is based on pixel density, which does not reflect all aspects of screen quality. This explanation is the easiest to understand and for this reason the most popular.
Reality testing
It often happens that it is very difficult to distinguish an HD screen from a FullHD screen if we are talking about a display with a diagonal of approximately 5 inches. To notice the differences, you will have to carefully study the screen. Most people hold their phone at the level of their elbows, maybe a little closer. From this distance, the difference between HD and FullHD screens is not easy to notice. If you look closely, these differences can be found, but in the process everyday use devices they will not play a significant role.
Vijay Srivastava bases his opinion on testing eight 5-inch and one 5.2-inch phones and comparing them with each other. Some of these phones had HD, others FullHD screens. He compared them at the same games and e-books and came to the conclusion that most people are simply unable to see the differences. Game performance largely depends on .
He repeated this test with a 5.2-inch HD screen Samsung Galaxy Grand 2 and compared it with the Micromax Canvas Turbo 5-inch FullHD display. Vijay Srivastava asked people's opinion about which phone has best screen. Of the 13 people who were shown both phones, 12 thought the Grand 2's display was better. The reasons given were that he had "better colors" and "looks brighter." It turned out that the screen with a lower resolution was considered better by the majority of those who had the opportunity to compare.
What does this mean for the user?
Thus, screen resolution and pixel density alone are not determining indicators of screen quality. In some cases, when the difference is significant, if, for example, you compare a WVGA (800 x 480 pixels) with an HD screen. But if we talk about the mainstream 5-inch screen modern smartphone, then distinguishing an HD screen from a FullHD display will not be easy. If the screen size is larger (6-inch), then the difference in FullHD quality will probably be more noticeable.
Pixel density and screen resolution are not the only factors affecting image quality
Therefore, when purchasing your next phone with a screen of about 5 inches, the user will most likely need an HD screen with a resolution of 1280 x 720 pixels and it is advisable to pay attention to other characteristics of the device - its processor and RAM. Although Sharp is so high resolution Maybe .
How many users, without knowing the exact characteristics of the device, will be able to immediately determine the resolution of a 5-inch smartphone screen (HD or FullHD)?
Every TV or set-top box you buy today will support high-definition (HD) video. But even so, there are a lot of terms. In particular, you need to know the difference between HD Ready, Full HD, Ultra HD and Full Ultra HD?
In the most basic terms, HD Ready TVs and set-top boxes can display 720p images at a resolution of 1280×720 pixels. Full HD TVs and set-top boxes display 1080p images with a resolution of 1920×1080 pixels. Ultra HD, or "Full Ultra HD", can go up to 4320p video with a resolution of 7620 x 4320 pixels.
The higher the resolution, the sharper the images look.
But if it were that simple...
HD Ready vs HD Ready vs Full HD
Wait, why does it say HD Ready twice? Depending on where you live, the definition of HD Ready is slightly different. In particular, the US and Europe define this differently.
IN THE USA HD Ready TV means the TV can output 720p images and has a built-in digital tuner. However, the same HD Ready logo is also printed on several projectors, computer monitors, and other devices that do not have a tuner. Television is an exception.
In Europe A digital tuner is not required to receive the HD Ready logo. The output must be 720p to receive the HD Ready logo. On some older TVs you may see the HD Ready 1080p logo. This is the same as the Full HD logo.
Worldwide gold logo Full HD 1080p is a standard which means the display can display 1080p images.
720 vs 1080
Logo aside, you need to know the actual difference in quality. Your TV displays video as a series of lines, both horizontal and vertical. How many horizontal lines can your TV display at one time? This is the magic number: 720 or 1080.
WITH big amount lines you get more pixels and therefore better video quality. That's why 4K and Ultra HD are even clearer.
Why myHDReady 720pTVShow is labeled 1080i? (Progressive and Interlace)
Things get confusing when you look at the HD Ready 720p TV specifications. There is another line that says it displays "1080i" videos. But 1080i doesn't mean it's Full HD. In fact, the seller may try to use this as one of their tricks to trick you, but don't fall for it.
"P" and "i" stand for progressive and interlace respectively. Progressive and interlace are how the TV displays each frame of video. As you know, most videos are around 25 frames per second.
With progressive scan or 1080p, the TV shows all 1080 horizontal lines simultaneously.
When scanning interlace or 1080i, the TV displays half the lines of one frame, and then half the lines of the next frame. The idea is to trick the eye into thinking it is one image, but the human eye ends up seeing the lack of quality.
Ignore "1080i" or anything with an "i" after it. Interlaced video doesn't look very good.
Where will you see these logos?
While you will always see HD Ready or Full HD logos on TVs, they appear on some other similar devices such as projectors and monitors. The most important thing for your TV is the set-top box.
The basic rule is that the video is played at the resolution supported by the device with the lowest speed. In other words, if your TV is Full HD 1080p, but your set-top box is HD Ready 720p, your TV will display a 720p picture. Some TVs will try to upscale the video, but this does not result in a better picture.
Likewise, a 720p TV with a 1080p video connector (through your set-top box or game console) will only show 720p video. Thus, high quality video will only be available when the input matches the resolution of the output signal.
Don't Worry About "HD Ready" in TVs and Other Displays
There's no point in worrying about the "HD Ready" tag on most devices these days. 720p resolution has become minimum value default for each display device. So if you buy a TV, monitor, projector or anything like that, it will support at least 720p video.
The Full HD tag can help you determine whether it supports 1080p video or not.
HD Ready vs Full HD vs 4K vs Ultra HD
In the last few years, as technology has advanced, you now need to consider two other logos. Ultra HD logo and 4K logo.
4K is a subset of Ultra HD and refers to 2160p video with a resolution of 4096×2160 pixels.
Ultra HD, or "Full Ultra HD", can go up to 4320p video with a resolution of 7620 x 4320 pixels.
Full Ultra HD is not currently available on most TVs.
And again, we're not just talking about TVs. Even to play videos at the same resolution, you'll need an Ultra HD Blu-ray player.
Permission vs. Quality
Unfortunately, marketers have turned image resolution into a measure of image quality. But this is not true at all. There are several factors that determine how video looks on your TV, and you shouldn't buy anything based on resolution alone.
The TV panel, processor, backlight technology and other details are also important.
Full HD is a video with high resolution. It is used for broadcasts with HDTV resolution.
The resolution of Full HD video systems is 1280x720 and 1920x1080 pixels, the sides have a 16:9 aspect ratio. In standard definition (SD) video, the aspect ratio is 4:3. High clarity is achieved by increasing picture detail by five times. Standard image clarity - individual pixels 720x576=414720. The number of pixels for the HD720 format increases to 1280x720=921600, and for HD1080 - 1920x1080=2073600, or two megapixels. This is n times more than standard definition. Most manufacturers are not very competent in the question of what Full HD is. They're talking about 6 megapixels on TVs. This is not entirely correct; it is more accurate to say that there are 6 million subpixels. After all, each color pixel has three subpixels with basic colors, such as:
Red;
Green;
Interlace supports frame rates at the following rates: 25, 29.97, 30 per second.
Progressive scan controls frames 50, 59.94, 60.
Thus, HD movies are 24 frames per second.
The designation HD720/24p stands for a frame with a resolution of 1280x720 pixels, due to progressive scanning of 24 frames per second. HD 1080/29.97i - a frame of 1920x1080, thanks to interlaced scanning - 29.97 frames.
Just don't confuse the frame rate with the 100 Hz scan rate on TVs. IN higher frequencies scans, identical frames are shown several times. In cinema, to reduce flicker, each frame is shown twice (48 Hz), and 24 different frames are shown in just a second.
Statistics are statistics, but you need to see from your own experience what Full HD is.
On panels with Full HD support, with a high-quality signal source, high video clarity is very obvious.
How is it achieved?
1. Picture detail has been improved five times. It is provided by a large number of points that make up the image.
2. The frame contains more information. Small details do not merge into a solid background.
3. The texture of the materials is better developed. Grass, fur, frost patterns became clearer. The final image is more realistic. Now you know what Full HD is. High definition video of all formats, up to the maximum - 1920x1080. If the matrix that is part of the TV or panel comes with a resolution of 1280, 1336, 1440, then there can be no talk of Full HD. Such matrices allow maximum display of HD720 - this is HD-Ready.
The differences between HD-Ready and Full HD are as follows:
1. There is no guarantee that a TV without markings with a matrix of 1280 pixels or more in width will display clearly. Such a device rather displays SD signals. It interpolates the standard sharp signal "up", increasing the base SD resolution to the physical resolution of the sensor.
2. HD-Ready label allows you to view standard and high definition videos.
3. Full-HD allows you to display SD, HD, HD 1080. Typically, such TVs are equipped with more powerful video processors, which allows you to watch HD movies in high quality directly at home. Manufacturers try to equip Full matrices, so they have the highest price range.
Based on all of the above, we can answer the question of what Full HD is. It's really high quality image, which is always a pleasure to watch!