How to know the great god of standard definition and high definition? Help!

1. Digital standard definition TV is abbreviated as Digital Standard Definition TV, and the English abbreviation is SDTV. The resolution of SDTV is 720*480i(NTSC, interlaced scanning) and 720*576i(PAL, interlaced scanning). The image effect of standard definition digital TV is similar to that of DVD, and standard definition digital TV is used in domestic digital TV pilot broadcast. 2.HDTV is a new product under the TV business. The original ITU-R definition of HDTV is: "HDTV should be a transparent system, and the image quality seen by the audience with normal vision at a distance of 3 times the height of the system display screen should have the impression obtained when watching the original scene or performance." 3. SD: below 480P (480 TV line, progressive scanning), such as VCD player, old DVD player and domestic digital TV. Hd: 720P or 1080 I(720 TV lines are scanned line by line, and 1080 TV lines are interlaced), but the national standard in China is 720P for HD, such as: HD DVD player, HD digital streaming media player, American and Japanese digital TV (under implementation). Full HD: 1080 p( 1080 TV line by line scanning) is the highest standard in the industry at present, such as: HD DVD player, HD digital streaming player, satellite TV, Blu-ray DVD player and HD-DVD player. It is enough to watch China's popular China digital TV 720P, and it is enough to watch the CRT of cable TV. There is no advantage in watching cable with high-definition or full-high-definition LCD, but the image effect may be poor because of high-definition. D is the abbreviation of three-dimensional, which is a three-dimensional figure. Displaying 3d graphics in a computer means displaying 3D graphics in a plane. Different from the real world, the real three-dimensional space has a real distance space. The computer just looks like the real world, so the 3d graphics displayed on the computer are just like the real world. One of the characteristics of the human eye is that when the distance is combined, it will form a three-dimensional sense. The computer screen is flat and two-dimensional. The reason why we can enjoy the real three-dimensional image is that the difference in color and gray level when displaying on the computer screen makes the human eye have a visual illusion and perceive the two-dimensional computer screen as a three-dimensional image. Based on the knowledge of chromatics, the protruding part of the edge of a three-dimensional object generally presents a high-brightness color, while the concave part presents a dark color because it is blocked by light. This understanding is widely used to draw buttons and 3d lines in web pages or other applications. For example, the 3d text to be drawn, that is, the high-brightness color is displayed in the original position, and the outline is outlined in the lower left or upper right position with low-brightness color, which will visually produce the effect of 3d text. In the concrete implementation, two 2d characters with different colors can be drawn in different positions with exactly the same font. As long as the coordinates of two characters are appropriate, 3d characters with different effects can be produced visually. 5.MAX movie I MAX comes from English "Image Maxium" and is the best imaging system in the world at present. It combines the achievements of film technology, with the largest screen, the clearest image, the highest precision, the most powerful projection equipment and the most advanced six-channel multi-speaker sound system. IMAX is known as "the ultimate experience of movies", because when you watch IMAX movies, you are not only looking with your eyes, but conniving at your whole body's senses to deceive yourself-a super-large screen with a height of seven stories and a width of 20 meters, a crystal clear picture, an extremely realistic six-channel and a subwoofer, and you will suddenly feel like a big beetle in Metamorphosis, and the boundary between reality and illusion is blurred: you are with all kinds of huge cells. You are standing on the top of the snow-covered Antarctica, blowing the cold wind with penguins. You just dive into the deep blue sea, and a dolphin swims past your hand; You walked in the Cretaceous virgin forest, and the dinosaur's claws almost licked your face ... If you stop here, IMAX movies are probably no different from the dynamic movies in the casino or the ball screen movies in the planetarium. At most, it is just a pastime for tourists to satisfy their curiosity, and it is impossible to arouse people's long-term interest. The genius of IMAX lies in the digital deepening processing technology (DMR) developed by IMAX, which can convert ordinary 35mm film into IMAX version of 70mm film, so that Hollywood blockbusters can be moved to an unparalleled super-large screen without damaging their "crystal-like" image quality. Although this technology is just mature, only a few movies have been transformed, such as prequel trilogy, The Matrix, Spider-Man II and Harry Potter 3. And the conversion price is as high as $2 million, but it shows great development potential, making IMAX films shown in museums, science and technology museums, planetariums, aquariums, theme parks and other popular science education institutions for more than 30 years. James Cameron, the great director who is famous all over the world for filming Titanic, even issued a prosperous warning that "IMAX cinemas will gradually replace traditional cinemas in the next five or six years". However, for most Hollywood filmmakers, the words of Sony Vice Chairman Blake may be more in line with their positioning of IMAX. "When you have a movie like Spider-Man II, it is an amazing waste if you don't convert it into this unparalleled IMAX format for the audience to enjoy." Nowadays, Hollywood has invested hundreds of millions of dollars to shoot blockbusters such as The Matrix and Harry Potter, and the conversion fee of 2 million dollars is not high by comparison. Moreover, due to the addition of blockbusters, IMAX cinemas are showing amazing box office potential. The three-dimensional animated blockbuster Polar Express, which was released some time ago, lost to Superman Family in the competition of ordinary cinemas, but it created a box office miracle of IMAX cinemas, and created a box office success of $3 million in 59 IMAX cinemas within one week. Inspired by the box office of Polar Express, Fox's next animated blockbuster Robot will also be shown in IMAX theaters. Stereo filmmakers look at the same object with their left and right eyes, and the images formed on the retina are not exactly the same. After the two images are synthesized by the brain, they can distinguish the front and back, the distance and the distance of the object, thus producing stereoscopic vision. The principle of stereoscopic film is that two cameras imitate the visual angle of human eyes and shoot at the same time, and two projectors project on the same screen at the same time for left and right eyes to watch, thus producing stereoscopic effect. When shooting three-dimensional movies, it is necessary to put two camera brackets on a special tripod head with adjustable angle and shoot at a specific included angle. The synchronization of the two cameras is very important, because even a few tenths of a second error will make the left and right eyes feel uncoordinated; So be sure to hit the board when shooting, so that you can find the synchronization point when editing. When showing a three-dimensional movie, two projectors are placed in a certain way, and two pictures are projected on the same screen point-to-point in a completely consistent and synchronous way. A polarizer should be added in front of the lens of each projector, one is a horizontal polarizer and the other is a vertical polarizer (or diagonally crossed), so that the screen will reflect different polarized light into the eyes of the audience. Viewers should also wear polarizers when watching movies, and the polarization direction of the left and right lenses must match the projector, so that the left and right eyes can filter out the unpolarized images and only see the corresponding polarized images, that is, the left eye can only see the images projected by the left machine and the right eye can only see the images projected by the right machine. After these pictures are synthesized by the brain, stereoscopic vision is produced.