The horizontal-to-vertical ratio of the image size.
Conventional TVs have a 4:3 ratio, and HDTVs
have a 16:9 ratio. Aspect ratios for movies
include the standard size of 1.38:1 and "vista"
sizes of 1.66:1 or 1.75:1. The aspect ratio has a
major effect on the dramatic elements and
mood of the images and scenes displayed.
An HD component digital format and codec.
The DVCPRO HD codec applies the DCT
(discrete cosine transformation) compression
algorithm to HD component signals to achieve
digital compression with superb image quality.
Because it uses the same DCT process of
intraframe compression as the other DVCPRO formats, it is able to handle data at a fast
100 Mbps, but its low compression ratio of 1/6.7 maintains high image quality. Its
superior codec characteristics also allow it to preserve HD image quality and perform
highly efficient data processing in nonlinear editing systems.
Sony's HD component digital format. It uses 8-bit sampling of the HD component
signal, with a Y:Pb:Pr = 3:1:1 sampling rate, for a compression ratio of about 1/7.
*HDCAM is a registered trademark of Sony Corporation.
A format that records HDTV video signals (1080i) at about 25 Mbps (approximately the
same as the DV format) onto DV cassette tape. In contrast with the DV format, it uses
interframe MPEG2 video compression, resulting in a high level of compression.
(MPEG2 MP@H-14: Main profile and high 1440 level)
*HDV and HDV logo are trademarks of Sony Corporation and Victor Company of Japan,
A full-specification HD component digital format developed by Panasonic. It uses 10-bit
sampling of the HD component signal, with a Y:Pb:Pr = 4:2:2 sampling rate. It is able to
preserve high image quality by covering the entire HD signal frequency range.
The number of images that can be recorded or played per second.
A professional video camera that uses the DVCPRO HD 720p format. Featuring special
gamma curves and the Variable Frame Rate function, VariCam is widely used in
producing movies for cinema screening.
Variable frame rate: The ability to vary the number of images that can be recorded per second. By
shooting at 60 fps (frames per second) and playing it back at the 24-fps speed, a 2.5x
slow-motion effect can be achieved.
A 4:2:2 component digital format and codec. Compared with DVCPRO (25M), the color
signal (Pb:Pr) range is wider, so the image quality is higher. By using the Y:Pb:Pr = 4:2:2
sampling rate and DCT compression for an SD component video signal, the data can be
compressed to about 1/3.3 that of the original signal. The name DVCPRO 50 is derived
from its data transfer speed of 50 Mbps.
A 4:1:1 component digital format and codec. This broadcasting and professional digital
video format and codec applies the image-enhancing DV video codec (with DCT
compression). The 4:1:1 component digital format was originally developed for
recording digital signals onto 1/4-inch tape, but its compression process was also highly
effective for codec use. By sampling an SD component video signal (Y:Pb:Pr) with the
4:1:1 sampling rate and applying the intraframe compression of the DCT algorithm, it
allows the data to be compressed to about 1/5 that of the original signal while