What is Aspect Ratio?

The aspect ratio, which is the ratio of the width of an image divided by its height, is usually expressed as " x : y " or " x × y ", where the colon and cross sign mean "ratio" in Chinese. Currently, the most commonly used in the film industry is the anamorphic ratio (ie 2.39: 1 ) [1]. The traditional 4: 3 (1.33: 1) is still used on many TV screens today, and its successor succession of 16: 9 (1.78: 1) is used on HDTVs and digital TVs in Europe. These three ratios are the three standard ratios specified by the MPEG-2 (DVD) digital compression format, while 16: 9 is also used by Blu-ray Discs and HD DVDs, and is also between two commonly used 35mm motion picture films. Eclectic (1.66: 1 in Europe and 1.85: 1 in the US and UK).

The surface dimensions of surface ships include maximum length, maximum width, design waterline length, and design waterline width. Ship design uses the design waterline aspect ratio (L / B) as a parameter of the ship type to express the thin length of the ship. For high-speed ships, adopting a larger aspect ratio can reduce the resistance of the ship at the design speed to increase the speed or reduce the power requirements of the main engine, which is beneficial to the speed of the ship. If the captain is too long for this purpose, the longitudinal structure design of the hull is bound to be stronger and the ship's own weight will increase. If the width of the ship is reduced for this purpose, the stability of the ship may be reduced. In the past, the design of ships began by selecting ship type parameters such as the aspect ratio to solve the ship's main dimensions. Since the second half of the 20th century, the total volume of arrangable cabins provided by the main hull has become an important factor in ship design considerations, and excessively thin and long hulls often cannot meet the requirements of total arrangable cabin capacity. Therefore, the selection of the main dimensions such as the length, width, and depth of the ship, and the selection of the ship's shape parameters such as the aspect ratio are the results of systematic consideration of multiple factors. The destroyer designed in the 1960s had an aspect ratio of more than ten. The aspect ratio of modern destroyers and frigates has gradually decreased. For example, the DD963 type designed by the United States in the 1970s "

4: 3 is the oldest ratio.

16: 9 is the international standard for high-definition television, used in Australia, Japan, Canada, and the United States, as well as European satellite television and some non-HD widescreen TVs (

Originally originated from the United Kingdom, and has been used in Britain, Ireland, France and other countries. As a local analog TV transmission format, most of them have been eliminated.

Aspect ratio Original aspect ratio

Original Aspect Ratio (OAR) is a term used in home theater to refer to the aspect ratio of a movie or video when it was originally producedas the author envisioned.
For example, when the ghost warrior first screened in a movie theater, a 2.39: 1 ratio was used.
It was originally shot on Super 35mm film, and it was not shown in cinemas and on TV, but it was also not matte-processed to accommodate 1.33: 1 footage. Due to the various methods used to shoot movies, "expected aspect ratio" is a more accurate term, but it is rarely used. ^[2]

Aspect ratio adapted to aspect ratio

Modified Aspect Ratio (MAR) is a term used in home theaters to refer to the original aspect ratio of a video that is changed by stretching, cropping, or matte to fit a particular display.
The adaptive aspect ratio is usually 1.33: 1 or 1.78: 1. The adaptive aspect ratio of 1.33: 1 has historically been used in the VHS format.
The matte method refers to, for example, some parts that are lost when stretching from 1.78 to 1.33. Since the subject of the picture is not necessarily in the center, it must be used to maintain the subject of the picture.