1 / 19

Digital Cinema

Digital Cinema. From Motion JPEG to Film projection A presentation by: Maxime Cassan Florent Rioult Neil Sinclair December 2008. Introduction. Very recent technology Bits and bytes Use of digital technology for:. Production. Distribution. Projection.

nuncio
Download Presentation

Digital Cinema

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Digital Cinema From Motion JPEG to Film projection A presentation by: Maxime Cassan Florent Rioult Neil Sinclair December 2008

  2. Introduction • Very recent technology • Bits and bytes • Use of digital technology for: Production Distribution Projection

  3. Brief History of Digital Cinema • 1999: First public demonstrations of modern day digital cinema • 2002: Introducing security (Star Wars II) • 2002: Creation of DCI • 2005: Release of DCI specifications v1.0 • 2007: 6000 digital cinemas over the world (<2% of the total number of movie theaters)

  4. Distribution of digital films • Digital films: bigcomputer files • In the past: • Numeric tapes • DVDs • Nowadays: • HDDsonly • Immaterial distribution

  5. Costs of Digital Cinema • Single film print: $1200 • 300GB HDD: $70 • Reduced costs while shooting and editing • Downsides: • Up to $150000 per screen • Digital playback system can cost 4 times as much as a film projector

  6. Compression • Compression Requirements: • Scalability • Camera Compression • Archive Compression • Compression Efficiency • Cost

  7. What is Motion JPEG2000 • Motion JPEG2000 is used in applications that require scalability, high quality, lossless coding and error resilience. • Created as an advancement to JPEG and JPEG2000. • Does not involve inter-frame encoding, only intra-frame encoding as each frame is encoded separately.

  8. Scalability • Resolution Example of resolution progressive bit streaming – [1] • Quality Example of layer progressive bit stream ordering – [2] The left is 0.125 bpp and the right is 0.5 bpp.

  9. Intra-frame Encoding • Each frame is independent • Each image in the sequence is an exact representation of the data at every point in time due to the lossless coding • Higher compression efficiency

  10. Review of compression • Flexible file format • Scalability • High compression • High quality • Lossless and near lossless compression • Ideal for Digital Cinema

  11. Liquid Cristal Display • 3 LCD Technology. • White Light is separated in 3 beams: Red, Green, Blue. • Each beam is masked by a LCD panel then the beams are recombined. • Not used in Digital Cinema. Image from http://www.projectorpoint.co.uk/

  12. Digital Micromirror Device • The DLP is based on the Digital Micromirror Device (DMD) technology • Each pixel is a tiny mirror which can be tilt: • In direction of the lens: the pixel is ON and white. • Away from the lens: the pixel is OFF and black • DMD is used to modulate light intensity to obtain different shades of gray (1024). • This is possible by tilting ON and OFF the mirror at a very high speed. Image from http://www.dlp.com

  13. Digital Light Processing (One chip) • The One chip DLP projector uses a chromatic wheel to filter the light to have successive Red, Green and Blue beams. • The DMD is used to modulate light intensity of each pixel for each color beam. • The HVS then merge the successive monochromatic images to form one full spectrum color image. • The issue with the one chip system is the rainbow effect Image from http://www.dlp.com

  14. One Chip DLP Rainbow Effect Photo taken of a hand moving quickly past a DLP projection, demonstrating the rainbow effect of a DLP projector's colour wheel. Author: Damien Donnelly From www.wikipedia.org License: Creative Commons

  15. Digital Light Processing (Three chips) • The Three chip DLP projector uses a prism to create simultaneous Red, Green and Blue beams. • Each one of those beam is reflected on a dedicated DMD • On the way back from the DMD the three beam go through the prism one again to be merge into one single beam • The is no rainbow effect with this system Image from http://www.dlp.com

  16. Liquid Crystal on Silicon • It is very similar to DLP as it is a reflective technology. • Instead of using micromirror it uses liquid crystal. Images from http://electronics.howstuffworks.com/

  17. Technology Comparison Own image from data on www.jvc.com

  18. Conclusion • Is digital really better than film? • Clarity • Detail • Immune to: • Scratches • Fading • Jitter • Total fidelity at every screening

  19. Questions?

More Related