WO2006129222A2 - Visualisation de donnees video dans un mode normal et dans un mode d'aguiche - Google Patents

Visualisation de donnees video dans un mode normal et dans un mode d'aguiche Download PDF

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Publication number
WO2006129222A2
WO2006129222A2 PCT/IB2006/051605 IB2006051605W WO2006129222A2 WO 2006129222 A2 WO2006129222 A2 WO 2006129222A2 IB 2006051605 W IB2006051605 W IB 2006051605W WO 2006129222 A2 WO2006129222 A2 WO 2006129222A2
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WO
WIPO (PCT)
Prior art keywords
data
image
enhancement
base
key
Prior art date
Application number
PCT/IB2006/051605
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English (en)
Other versions
WO2006129222A3 (fr
Inventor
Stephan O. Mietens
Mauro Barbieri
Wilhelmus H. A. Bruls
Hong R. Li
Johannes Weda
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006129222A2 publication Critical patent/WO2006129222A2/fr
Publication of WO2006129222A3 publication Critical patent/WO2006129222A3/fr

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Classifications

    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption
    • H04N21/44055—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving video stream decryption by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
    • 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
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234327—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by decomposing into layers, e.g. base layer and one or more enhancement layers
    • 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
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption
    • H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4621—Controlling the complexity of the content stream or additional data, e.g. lowering the resolution or bit-rate of the video stream for a mobile client with a small screen
    • 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]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/47—End-user applications
    • H04N21/472—End-user interface for requesting content, additional data or services; End-user interface for interacting with content, e.g. for content reservation or setting reminders, for requesting event notification, for manipulating displayed content
    • 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]
    • H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63—Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/631—Multimode Transmission, e.g. transmitting basic layers and enhancement layers of the content over different transmission paths or transmitting with different error corrections, different keys or with different transmission protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence

Definitions

  • the invention relates to conditional access video signal distribution and more particularly to video signal receivers, video signal distribution systems, methods of distributing and receiving video signals and to video signals.
  • US patent application No. 2004/252900 describes distribution of compressed video signal information in the form of a base quality signal and an enhancement signal that can be used to upgrade the base quality signal to a higher quality video signal, where base signal and enhancement signals may be coded using different coding standards and are independently decodable.
  • WO 03/036978 describes similar distribution techniques.
  • the higher quality video signal may provide for images with greater spatial resolution than the base quality signal for example.
  • the base quality signal is compatible with pre-existing transmission standards and corresponding television receivers or set-top boxes and the enhancement signal is provided for improved television receivers or set-top boxes that are capable of combining the base quality signal and the enhancement signal to realize better quality images.
  • US patent application No. 20040028227 describes encryption of video signals that comprise a base quality video signal and an enhancement signal. This patent application proposes to partition the image data and to use encryption to make access a part of image data that provides higher quality video signal conditional on the availability of a decryption key, which is typically provided only in return for a subscription fee.
  • the enhancement signal is encrypted so that for its decryption a decryption key is needed that is not needed for the base quality signal.
  • the base quality signal is encrypted for decryption with a different key, which can be obtained for a lower subscription fee, or the base quality signal is not encrypted at all.
  • US patent application No. 20040028227 and EP-1487147 A2 also briefly mention an embodiment wherein the base quality signal is encrypted but the enhancement signal is not encrypted. This is done when it is desirable to provide the same degree of encryption for all viewers. Not encrypting the enhancement signal saves processing power in this case. However the enhancement layer has no "visual meaning", if decoded without the base layer, it cannot be used as teaser.
  • a method of distributing video data is set forth in claim 1.
  • base data and enhancement data are encoded so that they are separately amenable in the same way to decoding into an image stream for controlling a display image, the enhancement data being distributed in a form that does not require decryption with a key that is needed for decrypting the base data.
  • a teasing mode of viewing is made possible, wherein only the enhancement data and not the base data is used to produce an image. This requires no additional bandwidth compared with the bandwidth needed for enhancing the base image for viewing during decryption mode wherein the base data is decrypted and modified according to the enhancement data.
  • the enhancement data is produced in the form of images that are obtained by modifying a default image according to the modifications that are needed to modify base images to obtain enhanced images.
  • the enhancement data can be used to control image generation without further measures.
  • a system for distributing video data that applies a method of this type is claimed in claim 5.
  • a receiving apparatus is claimed in claim 10. This apparatus is arranged to switch to different modes dependent on whether a key is available to decrypt base video data when a combination of base video data and enhancement data is available.
  • the enhancement data is used to modify images defined by the base video data.
  • the enhancement data is used to control image formation by itself, for example by modifying a default image.
  • the receiving apparatus has a user interface to select between teasing mode viewing and a passive mode wherein no enhancement information is displayed if no key is available.
  • a user that is interested in teasing information can switch to viewing of the teasing information.
  • Figure 1 shows a video signal generator
  • Figure 2 shows a video signal receiver
  • Figure 3 shows an encoder/encryption apparatus
  • Figure 4 shows a decryption/decoder apparatus.
  • Figure 1 shows a video signal generator, comprising an encoding/encryption apparatus 10 and a channel encoder 14.
  • Encoding/encryption apparatus 10 has an input 11 for receiving a source image stream and outputs 12a,b for outputting a first and second encoded image stream, which form base data and enhancement data that represent the source image stream.
  • Channel encoder 14 has inputs coupled to outputs 12a,b and an output 16 for a signal that contains both the first and second encoded image stream. This output may be coupled to a medium such as a cable TV system for or a wireless medium via a wireless broadcast transmitter for terrestrial or satellite transmission for example.
  • Encoding/encryption apparatus 10 comprises a sub-sampling unit 100, a first encoder 102, a decoder 104, an up-sampling unit 106, a subtracter 107, a second encoder 108 and an encryption unit 109.
  • Input 11 is coupled to an input of sub-sampling unit 100, which has an output coupled to first encoder 102.
  • First encoder 102 has an output coupled to encryption unit 109, which has an output coupled to first output 12a of encoding/encryption apparatus 10.
  • the output of first encoder 102 is also coupled to an input of decoder 104, which has an output coupled to up-sampling unit 106.
  • Subtracter 107 has inputs coupled to input 11 and an output of up-sampling unit 106. Subtracter 107 has an output coupled to an input of second encoder 108, which has an output coupled to second output 12a of encoding/encryption apparatus 10.
  • Figure 2 shows a video signal receiver.
  • the receiver comprises a channel decoder 20, a decryption/decoding apparatus 22, a display device 24 and a key source 26.
  • Channel decoder 20 has an input 21 and a first and second stream output 23a,b.
  • Input 21 is coupled to a medium such as a cable TV system, or a wireless medium via an antenna for receiving wireless transmission for example.
  • Decryption/decoding apparatus 22 has inputs coupled to first and second stream output 23a,b and an output coupled to display device 24.
  • the video signal receiver may be implemented for example as a set-top box, to feed a separate television receiver, or as part of a television receiver.
  • Decryption/decoding apparatus 22 comprises a decryption unit 220, a first decoder 222, an up-sampling unit 223, a second decoder 224, a selector 226, an adder 228, a deiault signal source 229 and an optional output circuit 227.
  • Decryption unit 220 has an input coupled to first stream output 23a and an output coupled to first decoder 222, which in turn has an output coupled to up-sampling unit 223.
  • Selector 226 has an external control input 28, signal inputs coupled to outputs of up-sampling unit 223 and default signal source 229.
  • Second decoder 224 has an input coupled to second stream output 23a.
  • Adder 228 has inputs coupled to outputs of selector 226 and second decoder 224 and an output coupled to display device 24, optionally via output circuit 227.
  • the function of all or part of the units could be performed by a suitably programmed computer circuit, or suitably programmed computer circuits. Alternatively part of the functions may be performed by circuits that are specifically designed for the purpose. Furthermore, it should be appreciated that the same, or effectively similar encoding and decoding result can be realized by applying the various functions in different sequence. Many variations are possible.
  • the video signal generator generates a signal that contains a first and second encoded image stream, which form base data and enhancement data that represent the source image stream.
  • the first encoded image stream is generated by encoding and encrypting a sub-sampled version of the source image stream from input 11.
  • Sub-sampling unit 100 sub-samples its input signal, for example by producing a sample value only for every second pixel position in each image (optionally after anti-alias filtering). Other forms of sub-sampling may be used.
  • First encoder 102 encodes the sub-sampled data, for example according to the MPEG standard, which is known per se, or using any other encoding standard.
  • Encryption unit 109 encrypts the encoded data according to any suitable standard. Encryption unit 109 outputs the first encoded image stream.
  • Decoder 104 decodes the encoded output signal of first encoder 102.
  • the input signal of first encoder 102 is substantially reconstructed.
  • differences may be present when a form of lossy encoding (e.g. MPEG) encoding is used in first encoder 102.
  • Up-sampling unit 106 restores the stream to its original sample rate, using any convenient form of up-sampling, for example repetition of decoded sample values.
  • Subtracter 107 determines the difference between the images of the restored stream and the source image stream.
  • Second encoder 108 encodes the differences using substantially the same encoding technique as first encoder 102, so that the output signals of both encoders are amenable to decoding by the same decoder.
  • Second encoder 108 outputs the second encoded image stream to channel encoder 14.
  • Channel encoder 14 encodes signal combines the first and second encoded image stream into a signal from which both image stream can be decoded separately.
  • the video signal receiver receives the signal that has been generated by the video signal generator.
  • Channel decoder 20 retrieves the first and second image stream and feeds them to decryption/decoding apparatus 22.
  • decryption/decoding apparatus 22 decrypts and decodes the streams and feeds them to display device 24.
  • Decryption unit 220 receives a decryption key from key source 26, which is for example a smart card that has been provided by the provider of a video service to one of its subscribers. Decryption unit 220 uses this key to decrypt the first image stream. Any decryption technique that is the inverse of the encryption technique of encryption unit 109 may be used.
  • First decoder 222 decodes the decrypted stream. The same decoding is used as in the decoder 104 of the signal generator apparatus.
  • Up-sampling unit 223 applies the same up-sampling technique as up-sampling unit 106 of the signal generator apparatus.
  • Second decoder 224 decodes the second image stream. The inverse of the encoding technique of second encoder 108 of the signal generator apparatus is used.
  • selector 226 passes the decrypted, decoded and up- sampled signal from up-sampling unit 223 to adder 228.
  • Adder 228 adds this signal to the decoded signal from second decoder 224.
  • Adder 228 substantially reverses the subtraction performed by subtracter 107 to reconstruct the source image signal, save for any loss produced by second encoder 108 of the video signal generator.
  • Adder 228 supplies the reconstructed signal to display device 24, where the signal controls the generation of an image on a display screen.
  • Selector 226 is arranged to support switching the receiver to a "teasing mode" when no suitable keys are supplied by key source 26 (e.g.
  • selector 226 supplies a default image stream from default signal source 229 to adder 228.
  • the default stream successively contains identical images each with a same default pixel value for every pixel location.
  • the output signal of adder 228 represents "teasing images" to which modifications have been applied that would be needed to reconstruct the source stream from images that follow from the first encoded image stream.
  • these modifications are applied to a deiault image and not to images that follow from the first encoded image stream. In this way teasing image are obtained that give some impression of the source stream, without requiring transmission of more information than needed for reconstruction of the source stream.
  • Selector 226 may comprise a control unit (symbolically indicated as a component of selector 226 delimited by a dashed line) for example, the control unit being coupled to an external control input 28 for receiving remote control signal for controlling switching to the teasing mode.
  • a separate control unit and/or any other type of input such as a switch on the receiver may be used.
  • the receiver may be arranged to switch between the decryption mode and the teasing mode automatically, dependent on whether or not valid decryption keys are supplied for a selected input signal. In the embodiment shown the receiver switches to a passive mode when no keys are supplied by key source 26 for this purpose.
  • the passive mode output circuit 227 is controlled to output a signal that represents a blank images or message images containing a message that no decryption of the first image signal is possible.
  • the output of the blank images or message images are replaced by the teasing images when this is selected via external control input 28.
  • the image generating device is arranged to add information to the first and/or second image stream to indicate that an associated second or first image stream is available. This may be done in any convenient way, such as in program descriptor blocks for the first and or second stream.
  • an identification of the associated stream is included as well, but this is not needed at least if a predetermined relation is defined between associated streams.
  • control unit when the control unit detects no information that an associated second or first image stream is available, then the control unit switches to a single image stream decryption mode or the passive mode, dependent on whether suitable keys are supplied by key source 26.
  • the control unit effectively disables addition by adder 228, so that only a decrypted and decoded image stream is fed to display device 24.
  • control unit of the receiver is arranged to detect information that an associated second or first image stream is available and to switch to the described decryption mode or teasing mode in response to such detection, dependent on whether suitable keys are supplied by key source 26. In one embodiment this is done automatically, in another embodiment the control unit makes a choice between switching to the passive mode or the teasing mode dependent on a user selection signal received from external control input 28. Thus, a user is enabled to select the teasing mode only if desired. It should be appreciated that in a video distribution system typically at least one image generator and a plurality of receivers are present, interconnected by cable connections or a wireless medium such as electromagnetic wave transmission. Different receivers may be switched to the decryption mode and the teasing mode (and optionally the passive mode) respectively at the same time during signal transmission.
  • signal receiver may be connected to such a system.
  • an apparatus capable of receiving the second image stream, dependent on channel selection may be connected to such a system.
  • such an apparatus is arranged to add default image information to received images when the second image is received. That is, such a receiver needs to contain only second decoder 224, adder 228 and deiault image source 229. In this way a user of such a receiver will be able to realize teasing mode viewing by tuning to the second image stream.
  • FIG. 3 shows an alternative embodiment of the encoding/encryption apparatus 10, wherein the default images are added in the encoding/encryption apparatus 10.
  • a default image source 30 and an adder 32 have been added.
  • the adder is inserted between subtracter 107 and second encoder 108 and has input coupled to outputs of subtracter 107 and default image source 30 and an output coupled to second encoder 108.
  • Figure 4 shows a corresponding embodiment of decryption/decoding apparatus 22.
  • selector 226 has been omitted, the output of up-sampling unit being connected to a first input of adder 228.
  • a further selector 40 and a subtracter 42 have been added.
  • Default image source 229 is coupled to a first input of subtracter 42, which has an output coupled to a second input of adder 228.
  • Further selector 40 has inputs coupled to outputs of adder 228 and second decoder 224 and an output coupled to output circuit 227.
  • the output of second decoder 224 is coupled to a second input of subtracter 42.
  • encoding/encryption apparatus 10 adds default images to the differences obtained from subtracter 107 before generating the second image stream. In this way an easily displayable second image stream is obtained.
  • Decryption/decoding apparatus 22 subtracts the default images from the second image stream in the decryption mode, thereby undoing the effect of addition of the default image in encoding/decryption apparatus 10.
  • further selector 40 passes the images from the second image stream to output circuit 227, including the default image that has been added in encoding/decryption apparatus 10. Thus, no addition of a default image is needed in decryption/decoding apparatus 22 in this mode.
  • addition of a default image in the image generator is preferred, because it enables a predictable form of display when a standard stream decoder decodes the second image stream, it should be appreciated that addition of a default image in the image generator is not indispensable, because some form of teasing image will occur with any decoding even if no default image is added in the image generator.
  • the default pixel values are within a range so that all, or at least a significant part of the modifications that can be encoded by the second image stream, when applied to the default image, lead to valid pixel values that can be displayed by display device 24.
  • valid pixel values have RGB color component values between 0 and 255.
  • the default pixel values are preferably selected so that on average at least more than half the pixel values will be in that range.
  • the default pixel values are selected so that all modified pixel values are in this range. If the range of modifications that can be defined by the second image stream is known, the corresponding range of default pixel values can be determined.
  • a corresponding range of default pixel values that leads to valid pixels values for say 60% of pixels can be determined and one or more default image values from that range may be used.
  • at least one of the default pixel values, and preferably all of the deiault pixel values in an image are non-zero, i.e. correspond to light between minimum and maximum intensity from display device.
  • the generator apparatus is arranged to encrypt both the first and second image stream, the second image stream being encrypted so that a different key is required for decryption than for the first image stream.
  • a decryption unit may be added to the receiver to decrypt the second image stream.
  • encoding/encryption apparatus 10 overlays an additional logo or commercial image over the image that is represented by the enhancement data, so that the additional image can be removed only if a key is available.
  • the logo or commercial image is added to the image that is supplied to first encoder output signal.
  • the logo or commercial image defines image content changes for showing a logo or commercial image overlaid with the original image.
  • the enhancement data will show a positive of logo or commercial image, that disappears when the base image is combined with the enhancement data.
  • the logo or commercial image will show.
  • the default image may contain a logo, but in this case the receiving apparatus should be provided with information to eliminate the logo when a key is available.
  • the logo or commercial may be added to the enhancement data, but not to the base image.
  • the receiving apparatus is preferably arranged to subtract the logo or commercial image from the image represented by the enhancement data if a key is available, e.g. by subtracting a stored image, or a reconstructed logo or commercial image.
  • the second image stream is generated by means of sub-sampling and up-sampling, so that it provides for increased spatial resolution
  • the invention is not limited to these embodiments.
  • a second image stream with increased spatial resolution can be generated in other ways than the one shown.
  • different quality improvements can be used.
  • the second image stream may provide for image information to increase temporal resolution (e.g. in the form of difference images between images in the first image stream and additional images for time points between the images in the first image stream).
  • the first image stream (base data) is derived mainly from lower frequency components (temporal or spatial) of the source image stream and the second image stream (enhancement data) is derived from higher frequency components.
  • a first image stream may represent black and white images and a second stream may represent additional information to indicate hue and saturation.
  • the first image stream (base data) is derived from to averages (spatially and/or temporally weighted over a local interval in color space) and the second image stream (enhancement data) is derived from differences from the averages.
  • the second image stream may define rim images for use beyond the edges of images of the first image stream, for example to expand that first stream from a 4:3 format to 16:9 format.
  • the receiver may use the second stream to update a default image instead of images of the first image stream when switched to the teasing mode.
  • a first and second image stream are used to represent a low quality image stream and modifications to improve that low quality image stream. That is, the first and second stream are preferably generated so that each can be decoded in the same way (except for optional decryption).
  • This has the advantage that receiving devices that are arranged to receive a single stream only will be able to receive the second stream, permitting some form of teasing mode viewing even if an image receiver is used that handles an image stream that a user selects, be it the first or second image streams, in the same way.
  • the first and second image stream may be encoded in different ways, that is with a first encoder 102 and a second encoder 108 that are mutually different and correspondingly with a first decoder 222 and a second decoder 224 that are mutually different. In this way only receivers with the required combination of decoders will be able to support viewing in the teasing mode and the decryption mode.
  • the default image preferably is an image that has the same pixel values everywhere in the image at every time, it should be appreciated that alternatively time or space dependent default images may be used, for example to reduce the quality of the images in the teasing mode or to add a logo etc.
  • time or space dependent default images may be used, for example to reduce the quality of the images in the teasing mode or to add a logo etc.
  • default images can be added at other points, for example during decoding or encoding.
  • the DC component of image block is encoded separately, so that addition of a constant pixel value can be implemented by changing the encoded DC value.
  • the first and second image stream are distributed together via the same medium, for example a cable TV system or a wireless broadcasting medium.
  • the streams are transmitted concurrently, e.g. by transmitting packets of both streams interlaced with one another in time-slot multiplexing fashion, or simultaneously using frequency division multiplexing.
  • the image streams may be stored on a machine readable disk. It is not even necessary that both streams are distributed via the same medium.
  • the first image stream may be distributed on disk, or via a cable television medium, whereas the second image stream is broadcast via a wireless medium. In this way receivers of wireless transmission will be able to view in the teasing mode, whereas those that have access to another medium will also be able to view in the decryption mode.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Human Computer Interaction (AREA)
  • Computer Security & Cryptography (AREA)
  • Processing Of Color Television Signals (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Selon l'invention, des données vidéo sont distribuées sous la forme de données de base destinées à représenter un flux d'images source et de données d'amélioration destinées à améliorer les données de base. Les données de base et les données d'amélioration sont chacunes distribuées sous le même format, de sorte que chacunes peuvent être utilisées pour générer une image, excepté que les données de base sont cryptées et les données d'amélioration ne sont pas cryptées. Un récepteur peut commuter entre un mode normal, dans lequel les données de base et les données d'amélioration sont combinées et un mode d'aguiche, dans lequel une image dérivée uniquement des données d'amélioration est présentée si aucune clé n'est disponible pour décrypter les données de base.
PCT/IB2006/051605 2005-05-31 2006-05-19 Visualisation de donnees video dans un mode normal et dans un mode d'aguiche WO2006129222A2 (fr)

Applications Claiming Priority (2)

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EP05104650 2005-05-31
EP05104650.6 2005-05-31

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WO2006129222A2 true WO2006129222A2 (fr) 2006-12-07
WO2006129222A3 WO2006129222A3 (fr) 2007-02-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2614785A (en) * 2022-01-12 2023-07-19 V Nova Int Ltd Secure enhancement decoding implementation

Citations (4)

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Publication number Priority date Publication date Assignee Title
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