Panasonic HVX200A Functions Guide - Page 61

Aspect ratio: DVCPRO HD: The horizontal-to-vertical ratio of the image size. SDTV 4:3 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. Standard 1.38:1 An HD component digital format and codec. HDTV The DVCPRO HD codec applies the DCT 16:9 (1.78:1) (discrete cosine transformation) compression Vista Size 1.85:1 algorithm to HD component signals to achieve Cinemascope digital compression with superb image quality. 2.35:1 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. [P.4] HDCAM: HDV: 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, Limited (JVC). 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. Frame rate: The number of images that can be recorded or played per second. VariCam: 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. DVCPRO 50: 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. DVCPRO: 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 HD-D5: 58