The Digital Fact Book - Quantel

Progressive (scan)Method of scanning lines down a screen where all the lines of a picture are displayedin one continuous vertical scan (progression). There are no fields or half pictures as withinterlace scans. Progressive scanning is becoming far more common as it is used withcomputer displays and all panel displays – LCD and Plasmas, and is now starting to be usedfor some DTV formats, e.g. – 1080/24P, 720/60P. The ‘P’ denotes progressive.A high picture refresh rate is required to give good movement portrayal, such as for fast actionand camera pans. For television applications using progressive scanning, this implies a highbandwidth or data rate and high scanning rates on CRT displays. Progressive scanning doesnot show the dither of detail associated with interlaced scans.There are now 50 and 60 Hz progressive 1080-line standards. These ‘super’ HD formatsare gaining ground and new infrastructure with up to 3 Gb/s capability is being installedto accommodate it in production... but this is not a transmission standard yet!See also: 24P, Interlace, Interlace FactorPProjectors (digital)Digital projectors input digital images and project them onto cinema-sized screens.Huge advances in this technology in recent years have been one of the driving forces behinddigital cinema. For post production or DI, many houses offer big screens for customersto see what the final cinema experience will look like.Among the prominent projection technologies in the large projector area are D-ILA from JVC,SXRD from Sony and DLP from Texas Instruments. These projectors work by shining theprojector light at reflective chips that display the image, so modulating the light that isreflected towards the projector’s lens. With resolutions up to 4K, the viewing public is veryimpressed with the results as, without film’s scratches, dirt and weave, they are treated toconsistent high quality results. Combined with suitable digital cinema players some projectorscan sequentially display the left and right-eye images of stereo movies fora 3D film experience.See also: Color management, Digital Cinema, DLP, D-ILA, SXRDPseudoscopic (Stereoscopic)If a stereoscopic signal is reversed (e.g. each eye is being fed the opposite eye signal) a strange‘punched in’ effect appears. This is also referred to as inverted stereo or reversed stereo.PublishingSee DeliverablesPulfrich effect (Stereoscopic)Horizontal motion that can be interpreted as binocular depth. A stereo effect which isproduced when 2D images moving laterally on a single plane are viewed at slightly differenttimes by each eye.142