WO2007041839B1 - Image display methods and systems with sub-frame intensity compensation - Google Patents

Image display methods and systems with sub-frame intensity compensation

Info

Publication number
WO2007041839B1
WO2007041839B1 PCT/CA2006/001659 CA2006001659W WO2007041839B1 WO 2007041839 B1 WO2007041839 B1 WO 2007041839B1 CA 2006001659 W CA2006001659 W CA 2006001659W WO 2007041839 B1 WO2007041839 B1 WO 2007041839B1
Authority
WO
WIPO (PCT)
Prior art keywords
sub
still image
frames
image
areas
Prior art date
Application number
PCT/CA2006/001659
Other languages
French (fr)
Other versions
WO2007041839A1 (en
Inventor
Vincent So
Original Assignee
Vincent So
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vincent So filed Critical Vincent So
Publication of WO2007041839A1 publication Critical patent/WO2007041839A1/en
Publication of WO2007041839B1 publication Critical patent/WO2007041839B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T1/00—General purpose image data processing
    • G06T1/0021—Image watermarking
    • G06T1/0085—Time domain based watermarking, e.g. watermarks spread over several images
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • H04N19/467—Embedding additional information in the video signal during the compression process characterised by the embedded information being invisible, e.g. watermarking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • H04N21/23892—Multiplex stream processing, e.g. multiplex stream encrypting involving embedding information at multiplex stream level, e.g. embedding a watermark at packet level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/835—Generation of protective data, e.g. certificates
    • H04N21/8358—Generation of protective data, e.g. certificates involving watermark
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3117—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing two or more colours simultaneously, e.g. by creating scrolling colour bands
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91392—Television signal processing therefor for scrambling ; for copy protection using means for preventing making copies of projected video images

Abstract

Image display methods and systems are provided wherein only portions of a still image of a motion picture, generated for display during an image time interval, are displayed during respective sub-intervals of the image time interval. A still image is thereby separated into portions and displayed separately during corresponding sub-intervals. Preferably, no single portion of the image includes all of the content of the entire image. However, the sum of all of the portions preferably includes all of the content of the image, and all of the portions are displayed within the image time interval. Although an image displayed in this manner can be correctly perceived by a viewer, recording of such an image may capture fewer than all of the portions of the image to thereby degrade the quality of recorded copies of the image and thus the motion picture. Intensity compensation is performed such that a consistent brightness is perceived by a user notwithstanding the fact that some portions are displayed for less time.

Claims

44AMENDED CLAIMS received by the International Bureau on 26 March 2007 (26. 03. 2007)We Claim:
1 . A method comprising :
for each of a plurality of still images of a motion picture:
rendering a respective sequence of sub-frames such that each sub-frame comprises the still image with one or more areas omitted, with every area of the still image being included in at least one sub-frame;
applying intensity compensation such that when the sequence of sub-frames is displayed, an image substantially equivalent to the still image is perceptable.
2. The method of claim 1 further comprising:
processing each still image to determine areas that have a low intensity;
wherein the areas that are omitted in rendering the sequence of sub-frames are selected from the areas determined to have low intensity.
3'. The method of claim 2 wherein processing each still image to determine areas that have a low intensity comprises:
determining areas that have an intensity less than or equal to l/N times a maximum intensity, where N is the number of sub-frames in the sequence of sub-frames.
4. The method of claim 1 wherein applying intensity compensation such that when the sequence of sub-frames is displayed, an image substantially equivalent to the still image is perceptable comprises: 45 rendering a film with one still image per processed still image in which areas that are to be omitted are brighter on the film;
storing information identifying the areas of the film that are brighter;
during projection, applying sub-framing using the stored information.
5. The method of claim 1 wherein rendering and applying intensity compensation comprises:
storing one digital image per sub-frame;
increasing intensity of stored pixels that are omitted in at least one sub-frame.
6. The method of claim 1 wherein applying intensity compensation and rendering comprises:
storing one digital image per still image in which pixels of the areas to be omitted have increased intensity, and storing information identifying the areas that have increased intensity;
during projection, applying sub-framing using the stored information.
7. The method of claim 1 wherein processing the image to determine areas, that are less bright comprises: determining a maximum brightness of each of a set of possible areas to be omitted;
selecting areas having a maximum brightness less than a threshold. 46
8. The method of claim 7 wherein determining a maximum brightness of each of a set of possible areas to be omitted comprises :
determining a maximum Y value for each of the possible areas to be omitted.
9. The method of claim 8 further comprising computing a Y value for each pixel from RGB coding .
10. The method of claim 1 wherein:
rendering the sub-frames comprises displaying the sub-frames.
11. The method of claim 1 wherein rendering comprises recording.
12. The method of claim 5, wherein the plurality of sub-frames of the still image comprises N sub-frames, wherein N is a positive integer greater than 1, and wherein each sub-frame is displayed for sub-intervals that is approximately a fraction l/Nth of an image time interval, and wherein areas that are omitted in all but one sub-frame have their intensity increased by a factor of N1^, where γ is a power relationship between an encoded luminance (Y) of the area and an actual desired image brightness (I) by
I = Yγ
13. The method of claim 1, further comprising generating each still image in a motion picture projector for projection onto a screen; wherein rendering comprises filtering the generated still image to allow the plurality of areas of the generated still image to pass to the screen during respective sub-intervals .
14. The method of claim 1, further comprising:
projecting each still image onto a mirror;
wherein rendering comprises reflecting the plurality of areas of the still image from the mirror to a screen during respective sub-intervals .
15. The method of claim 1, wherein rendering comprises illuminating a mirror in a digital motion picture projector.
16. The method of claim 15, wherein displaying comprises :
providing an LCD (liquid crystal display) covering at least a area of the mirror; and
controlling the liquid crystal display to position liquid crystals of the LCD to allow the areas of the generated still image to pass through the LCD during respective sub-intervals .
17. The method of claim 1, wherein rendering comprises filtering each still image to display the plurality of areas of the still image during the respective sub-intervals.
18. A projection system adapted to implement the method of claim 1.
19. A motion picture medium production system adapted to implement the method of claim 1.
20. A system comprising: 48 an image generator configured to generate a plurality of still images of a motion picture for display during respective image time intervals; and
a display controller configured to display, for each of a plurality of still images of a motion picture, a respective sequence of sub-frames such that each sub-frame comprises a respective area of the still image and such that all areas of the still image are included in at least one sub-frame;
wherein there is intensity compensation such that each area of the still image that is not included in all sub-frames is perceptable to have a brightness substantially equivalent to what would have been the case had the area been included in all sub-frames.
21. The system of claim 20, wherein the plurality of sub-frames of each generated still image comprises n sub- frames, and wherein each of the sub-frames is displayed for approximately a fraction 1/rzth of the image time interval.
22. The system of claim 20, wherein the image generator comprises a motion picture projector.
23. An intensity compensated sub-framed motion picture medium comprising:
for each of a plurality of still images, a respective sequence of sub-frames such that each sub-frame comprises a respective area of the still image and such that all areas of the still image are included in at least one sub-frame;
wherein intensity compensation is applied to the sub-frames such that each area of the still image that is 49 not included in all sub-frames is perceptable to have a brightness substantially equivalent to what would have been the case had the area been included in all sub-frames.
24. An intensity compensated sub-framed motion picture medium comprising:
a plurality of still images in which intensity compensation has been performed such that when subsequently a respective sequence of sub-frames is produced and displayed from each still image such that each sub-frame comprises a respective area of the still image and such that all areas of the still image are included in at least one sub-frame, each area of the still image that is not included in all sub-frames is perceptable to have a brightness substantially equivalent to what would have been the case had the area been included in all sub-frames;
a computer readable medium containing information on how sub-framing is to be performed consistently with how intensity compensation was performed.
25. The motion picture medium of claim 24 wherein the plurality of still images comprise a film.
26. The motion picture medium of claim 24 wherein the plurality of still images comprise digital images stored together with the information on how sub-framing is to be performed.
27. An intensity compensated sub-framed motion picture medium comprising:
for each of a plurality of still images, a respective sequence of sub-frames such that each sub-frame comprises a respective area of the still image and such that 50 all areas of the still image are included in at least one sub-frame;
a computer readable medium containing information identifying where intensity compensation needs to be performed within the sub-frames such that each area of the still image that is not included in all sub-frames is perceptable to have a brightness substantially equivalent to what would have been the case had the area been included in all sub-frames.
28. The motion picture medium of claim 27 wherein the still images are digital images stored together with the information.
PCT/CA2006/001659 2005-10-13 2006-10-11 Image display methods and systems with sub-frame intensity compensation WO2007041839A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/248,420 US7693330B2 (en) 2004-03-15 2005-10-13 Anti-piracy image display methods and systems with sub-frame intensity compensation
US11/248,420 2005-10-13

Publications (2)

Publication Number Publication Date
WO2007041839A1 WO2007041839A1 (en) 2007-04-19
WO2007041839B1 true WO2007041839B1 (en) 2007-06-07

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US20100142912A1 (en) 2010-06-10
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US20060029252A1 (en) 2006-02-09
US7693330B2 (en) 2010-04-06

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