DIGITAL VIDEO SIGNAL PROCESSOR APPARATUS WITH PREPROCESSOR FOR GENERATING NON-INTERLACE-SCAN VIDEO SIGNALS FROM INTERLACE-SCAN VIDEO SIGNALS

摘要

A preprocessor for conditioning interlace-scan videosignals for frame based compression, includes apparatus (40) toaccept fields of interlace-scanned video and provide fields ofinterlace-scanned luminance and chrominance component signals.The fields of interlace-scanned luminance component arecombined (45) into respective frames of luminance signal andapplied to compressor apparatus for further processing. Thefields of interlace scanned chrominance components areindependently processed (41,42) at the field level to generatelines of chrominance values which are interstitial to the lines ofthe original chrominance values and at a lesser pixel and linedensity. The independently processed fields of interlace-scannedchrominance signals are combined (43,44) into respective framesof chrominance component signals and applied to compressorcircuitry (46) for further processing. Performing the chrominancesignal interpolation and subsampling (41,42) at the field leveltends to eliminate a majority of color distortions around movingimages. Receiver apparatus (50) is configured to perform postdecompression processing to generate frame data having theoriginal pixel and line density.