Backwards-compatible delivery of digital cinema content with extended dynamic range

摘要

A digital cinema signal is encoded to produce a resulting coded digital cinema bitstream. Decoding the resulting coded digital cinema bitstream allows backwards-compatible delivery of digital cinema content. A digital image or video signal is preprocessed to produce two normalized digital image or video signals of differing quality levels and forward and inverse mapping parameters, which relate the normalized digital image or video signals. The preprocessing can be used prior to the encoding of a digital cinema signal to enable backwards-compatible delivery of digital cinema content.

主权项

1. A method of decoding a coded digital bitstream (255), wherein the coded digital bitstream (255) comprises a coded digital image (105A, 105B) and mapping metadata (125A, 125B), the method comprising:
decoding the coded digital bitstream with a decoder (110A, 110B) to generate a first normalized digital image (115A, 115B) with a first dynamic range; and applying (120) the mapping metadata to the first normalized digital image to generate a second normalized digital cinema image (130A, 130B) with a second dynamic range, wherein the mapping metadata comprise an invertible mapping between the first and the second normalized digital images, wherein the invertible mapping comprises an invertible nonlinear transformation and an invertible matrix transformation.