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Audio/Video compression Recent progress

Audio/Video compression Recent progress. Alain Bouffioux December, 20, 2006. Agenda. Digital cinema 3D-television High-definition television and DVD. Agenda. Digital cinema 3D-television High-definition television and DVD. Introduction.

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Audio/Video compression Recent progress

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  1. Audio/Video compressionRecent progress Alain Bouffioux December, 20, 2006

  2. Agenda • Digital cinema • 3D-television • High-definition television and DVD AV Compression / Alain Bouffioux

  3. Agenda • Digital cinema • 3D-television • High-definition television and DVD AV Compression / Alain Bouffioux

  4. Introduction • 2002 – Digital cinema initiative created by 7 studios • 2006 – First standardized (non-proprietary) trial • Advantages of digital cinema • Higher quality image • No deterioration with time (scratches, dirt…) • Possibility of 3-D offering (need to carry glasses with polarized lenses) • Passive: one lens polarized in one direction, the other one in the other one(cheap lenses but special screen for keeping polarization of reflected light) • Active: lenses are switched on/off by an infrared signal(normal screen but need to collect and wash the lenses at the end of the projection) • Ease of copy and distribution (satellite or hard-disk drive via truck) • Possibility of new applications: football match or concert in real-time 3D rendering AV Compression / Alain Bouffioux

  5. About the digital cinema standard • Some numbers; • Film still shot on 35-mm film • After capture and digitization: about 5000 Terabytes • Final uncompressed movie: some terabytes • After compression: about 300 Gigabytes • The standard • Resolution: equivalent to 35 mm filmMinimum resolution: 2048 * 1080 (called 2K)Other resolution: 4096 * 2160 (called 4K) • 16 bits per color/48 bits per pixels • Video compression: Not MPEG-2 to avoid motion artifact JPEG2000 – each frame encoded individually (no removal of intra-frame redundancy, wavelet transform) • Audio compression: “uncompressed” CD-quality AV Compression / Alain Bouffioux

  6. System workflow(From Digital Cinema System specification v1.0, www.dcimovies.com) AV Compression / Alain Bouffioux

  7. Agenda • Digital cinema • 3D-television • High-definition television and DVD AV Compression / Alain Bouffioux

  8. 3D-television (1/2) • 3D-television without wearing glasses is possible. • The television screen is covered with small lenses. Each eye sees other parts of the television screen and perceives other images. When the two images are stereoscopic views of the same scene, a 3D-experience is provided. • 3D content is needed • 3D content may be provided from traditional film after processing.Depth information may be computed when the camera is moving. Depth information encoding within MPEG stream currently under definition. AV Compression / Alain Bouffioux

  9. 3D-television (2/2) • 2D-to-3D conversion may occur in real-time. 3-D television possible with 2D-content and processing within television set.But, problem when hidden surface becoming visible (no depth information) • 2D-to-3D conversion off-lineFilm may be processed in both directions (begin-to-end and end-to-begin) to solve the problem of hidden surface becoming visible. Depth information is then stored in MPEG stream. AV Compression / Alain Bouffioux

  10. Agenda • Digital cinema • 3D-television • High-definition television and DVD AV Compression / Alain Bouffioux

  11. Blue-ray versus HD-DVD • Two competing format:Blue-ray and HD-DVD format • Some readers equipped with both formats • Blue-laser for both but different wavelength • Blue-Ray (25Mbps) versus HD-DVD (15 Mbps) AV Compression / Alain Bouffioux

  12. AV Compression / Alain Bouffioux

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