The Digital Fact Book - Quantel

3D (stereo)In television, film or cinema, 3D may refer to material that is shot using a set of ‘stereo’cameras and shown on the screen as a pair of superimposed stereo images (usually‘decoded’ by the viewer with polarized spectacles). Also known as stereo3D andstereoscopic 3D.See also: Stereoscopy3G SDISee: Serial Digital Interface4:1:1This is a set of sampling frequencies in the ratio 4:1:1, used to digitize the luminanceand color difference components (Y, R-Y, B-Y) of a video signal. The 4 represents 13.5 MHz,(74.25 MHz at HD) the sampling frequency of Y, and the 1s each 3.75 MHz (18.5625)for R-Y and B-Y (ie R-Y and B-Y are each sampled once for every four samples of Y).With the color information sampled at half the rate of the 4:2:2 system, this is usedas a more economic form of sampling where video data rates need to be reduced.Both luminance and color difference are still sampled on every line but the latter has halfthe horizontal resolution of 4:2:2 while the vertical resolution of the color informationis maintained. 4:1:1 sampling is used in DVCPRO (625 and 525 formats), DVCAM(525/NTSC) and others.Raster linePixels • • • • • • • • •Y Y Y Y Y Y Y Y YC r C r C rC b C b C bSee also: 4:2:0, 4:2:2, DV (DVCAM and DVCPRO)15