EP1593268A1 - Methode et appareil de transmission securisee d'images code jpeg - Google Patents
Methode et appareil de transmission securisee d'images code jpegInfo
- Publication number
- EP1593268A1 EP1593268A1 EP03810005A EP03810005A EP1593268A1 EP 1593268 A1 EP1593268 A1 EP 1593268A1 EP 03810005 A EP03810005 A EP 03810005A EP 03810005 A EP03810005 A EP 03810005A EP 1593268 A1 EP1593268 A1 EP 1593268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- equipment
- modified
- content
- coefficients
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
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Classifications
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- 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
- H04N19/85—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
- H04N19/88—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving rearrangement of data among different coding units, e.g. shuffling, interleaving, scrambling or permutation of pixel data or permutation of transform coefficient data among different blocks
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- 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
Definitions
- the present invention relates to the processing, broadcasting, recording and secure visualization of digital still images, or more generally any file using a nominal format of JPEG type, by authorized users and proposes a secure system for the processing, broadcasting, delivery, recording, private copying and viewing of visual content.
- the general problem is to provide a device capable of securely transmitting a set of high quality still images to a live JPEG format to a display device and / or to be recorded on the hard disk. a box connecting the remote transmission network to the display device, while preserving the visual quality but avoiding any fraudulent use such as the possibility of making pirated copies of still images recorded on the hard disk of the set-top box.
- the invention also allows full control over the use of copies and the rights of the works broadcast.
- the European patent application EP0920209 relates to a method of video scrambling in the MPEG-2 format, the video data being composed of at least one block of at least one image coded in Intra (I) mode and comprising data (AC, DC) determined by a discrete cosine transformation (DCT) and comprising for each block, a first DC coefficient representing the average intensity of the pixels of the block and AC coefficients representing the intensity variations between the pixels of the block.
- the video scrambling is performed by an internal permutation step in at least one block, according to a permutation row (R), AC coefficients representing the intensity variations between the pixels of the block. .
- This application of the existing art can be applied to JPEG type images whose structure is similar to that of Intra mode images of a PEG-2 stream.
- This document of the prior art concerns the AC coefficients and the R-rank permutation function applied to them and also the DC coefficients recalculated using a command C.
- this prior art represents a conventional encryption solution.
- this known invention only allows the scrambling and descrambling of an MPEG-2 stream without a method of securing the dissemination of its data for the reconstitution of the original stream.
- Document EP1011269 also discloses a system for processing an information signal, comprising a scrambling system of the information signal and at least one scrambling information signal descrambling system.
- the scrambling system comprises means for analyzing the entropic distribution of the information signal, means for scrambling the information signal according to its entropy distribution to form a scrambled information signal having the same entropy distribution as the clear information signal and means for compressing the scrambled information signal.
- the descrambling system comprises means for decompressing the scrambled signal and means for descrambling the scrambled signal to form the clear information signal.
- This document of the prior art describes a secure distribution system of a signal in which the descrambling of the stream requires the scrambled flow and additional information to descramble the flow.
- said additional information is stored encrypted on the hard disk of the user wishing to use the signal.
- a malicious user and having appropriate computer means can decrypt said additional information and use the clear information signal without the agreement of the owner of this signal.
- this known system relies solely on the entropy distribution of the signal to scramble it and the scrambling is performed prior to compression and quantification. Equalization is applied to minimize losses, this prior art describes how to limit the degradation provided by this process, however without guaranteeing the absence of damage; this process is not without losses.
- the method finally represents a conventional encryption and scrambling solution, all the initial information is present in the protected stream. Therefore, the goal of preserving the high visual quality of a lossless process and ensuring high security of the visual content and data for their reconstruction is not achieved by this prior art.
- the invention relates, in its most general sense, to a method for distributing fixed digital images in a nominal format, each image being decomposed into blocks and macroblocks that depend on each other by coefficients of correlation, and where, prior to transmission to the client equipment, a content analysis is carried out to generate a main content in nominal format corresponding to the fixed image modified by the substitution of certain correlation coefficients by coefficients of same nature but random, and a complementary digital information of any format, including substituted correlation coefficients and digital information able to allow the reconstruction of said modified image, then to transmit separately, the main content modified in real time or in deferred time and additional digital information in real time el at the time of visualization from the server to the destination equipment, and in that the destination equipment is computed with a summary of a content at the destination nominal format according to said modified main content and said additional information.
- the nominal format is defined by the JPEG standard.
- said synthesis produces an image strictly identical to the original image, that is to say that the process is lossless.
- said analysis determines the correlation coefficients to be modified to obtain said main content modified by inversion of two correlation coefficients, or replacement of the correlation coefficients of a fixed image by random values.
- said synthesis is authorized for consultation of a private copy requested by the client.
- the transmission of said modified main content is performed through a physically distributed hardware medium such as a CD-ROM, a DVD, a hard disk or a flash memory type memory card for example.
- the transmission of said modified main content is performed through a broadband network (cable, satellite, optical fiber, radio, DSL, DAB).
- a broadband network (cable, satellite, optical fiber, radio, DSL, DAB).
- the transmission of said complementary information is carried out through a wired network, through a switched telephone network (analog or digital RTC), through a mobile telephone network using the GSM, GPRS or UMTS standards. , through a BLR network (radio local loop) or through a DSL type network.
- the transmission of said complementary information is carried out through a broadband network of the same type as the network used by said main content, or even through the same network.
- the transmission of said complementary information is carried out by means of a flash memory type memory card or by means of a smart card.
- the two generated parts can be intended for a single equipment, a group of equipment or all equipment.
- Reconstruction may also be allowed for viewing a private copy of the still image requested by the client.
- the fact that the reconstruction is conditioned to the authorization of the portal allows any operator of the service to manage all rights attached to still images and visual works.
- the invention also relates to an equipment for the manufacture of a visual content for the implementation of the method described above, comprising at least one media server containing the original images and characterized in that it comprises an analysis device of the image from said server to generate the two parts.
- this equipment includes a memory for the recording of a "private copy" marker indicating for each still image the rights of each user: private copy can be viewed a number unlimited times, private copying that can be viewed a limited number of times and which number, private copy prohibited.
- the invention relates to equipment for operating a visual content for the implementation of the method described above, comprising a standard content decoder, at least one recording interface.
- said means is a software application installed on the equipment.
- said means is a fixed electronic device.
- said means is a portable (mobile) electronic device with its built-in screen.
- said means uses a resource specific to the product (card) to avoid copying the temporary information of said complementary information on a permanent support.
- said recording interface also stores a "private copy" marker in relation to said modified main content indicating for this image the rights of the user: private copy can be viewed an unlimited number of times, private copy can be viewed one limited number of times and which number, private copy prohibited.
- the equipment comprises a smart card reader for identifying the user.
- the equipment comprises a smart card reader, the smart card containing the software applications.
- the equipment comprises a smart card reader, the smart card containing the data of said complementary information for a given content.
- the invention relates to a system for transmitting a digital image comprising a digital image production equipment, at least one digital image operating equipment and at least one communication network between the equipment. production equipment and equipment (s).
- FIG. 1 describes the overall architecture of a system for implementing the method according to the invention
- FIG. 2 represents a particular embodiment of the JPEG content analysis and synthesis system according to the invention
- FIG. 3 represents a particular embodiment of the content synthesis system according to FIG.
- the invention relates to a set of data of a nominal format, including but not limited to a JPEG file.
- the file format used must have the following characteristics: The image corresponding to the file is broken down into macroblocks of a given size, said macroblocks breaking down themselves into blocks of a given size;
- the image contains correlation coefficients between the different blocks and / or macroblocks.
- the general principle of a method of securing the transmission of still images is explained below.
- the goal is to allow on-demand and on-demand still image viewing services across all broadcast networks and local recording in the user's digital set-top box.
- the solution consists in permanently keeping outside the user's home, in fact in the broadcasting and transmission network, part of the recorded visual content, this part being essential for viewing said content on a device of the user. display as a monitor or a television screen, but being of a very small volume compared to the total volume of the digital visual content recorded in the user.
- the missing part will be transmitted via the transmission broadcast network at the time of viewing of said digital visual content prerecorded at the user.
- FIG. 1 is a block diagram of a dispensing system according to the present invention.
- FIG. 2 represents a particular embodiment of the content analysis and synthesis system according to the invention.
- FIG. 3 represents a particular embodiment of the content synthesis system according to the invention.
- the interfacing arrangement (8) is adapted to connect at least one display device, for example a monitor, a video projector or a television screen device (6), to at least one broadband broadcast and transmission network interface (4) and at least one telecommunication network interface (10).
- this arrangement is composed of a module (8) mainly comprising, on the one hand, a processing unit adapted to process, in particular decode and descramble any JPEG-type image according to a software program for decoding and descrambling preloaded so as to display, store, store and / or send on a telecommunication network and, on the other hand, at least one screen interface (7) and an interface of connection to a local or wide area network (5) and / or (9).
- the broadband transmission and broadcasting network (4) and the telecommunications network (10) can be merged into a single network.
- the hard disk of the module (8) can be used as a buffer to temporarily store at least a portion of the visual content to be displayed, in case of delayed viewing or limitation in the bandwidth of the network of transmission.
- the display may be delayed or delayed at the request of the user or the portal (12).
- connection interface As shown in Figure 1, the connection interface
- a broadband broadcast and transmission network (4) such as a modem, a satellite modem, a cable modem, a fiber optic line interface or a radio or infrared interface for wireless communication.
- a JPEG image is thus modified while retaining the complementary information enabling the image to be reconstructed in the portal (12).
- This additional information is determined by the coding of the image.
- the first operation of a JPEG type encoding is the division of the image into blocks, of 8 pixels by 8 pixels for JPEG. Each block thus constitutes a set of integer values, each value being encoded on a certain number of bits. In the case of a grayscale JPEG image, there are 64 values each coded on 8 bits, ie 256 possible values, for each block. Values range from 0 (black) to 255 (white).
- the second step of JPEG compression is the transition to the frequency domain.
- the block composed of luminous intensity values is transformed into a block of the same size containing the spatial frequencies attached to these intensities.
- the intensities are previously shifted to be centered around 0.
- the new scale of intensities thus goes from -128 to +127.
- the transformation performed is a discrete cosine transform ("DCT"), which organizes the frequencies in the block so that the low frequency components are located at the top left of the block.
- the first component at the top left is the DC component of the block ("DC coefficient").
- the difference between the coefficient DC of the processed block and the last coefficient DC of the same type encoded is coded in order to reduce the size taken by the code stream.
- the third step is the quantization of the frequency values obtained by transformation in order to reduce the information necessary to transmit.
- This quantification is adapted to the human visual system. For this, we define a quantization matrix of the same size as the frequency block. Each coefficient of the latter is quantized according to the corresponding value in the quantization matrix. Thus, if the value of the coefficient is 200 and the corresponding quantization step is 50, the quantized value will be 4 (ie 200 divided by 50). Since the human eye is less sensitive to information loss in high frequencies, quantization steps are increasing with frequency. This implies in particular that if the not is important for high frequencies, many of the quantized coefficients located will be 0.
- This property is used for coding the quantized coefficients of each block, by encoding a block as a succession of zigzag ordered coefficients from the upper left corner.
- the end of the sequence for this block will thus include many consecutive zeros, which makes it possible to optimize the coding.
- variable length coding is a statistical coding technique that assigns code words to the values to be encoded. Short codewords are assigned to high occurrence frequency values, and long codewords to infrequent occurrence ones. On average, more frequent short codewords are in the majority, so the coded string is shorter than the original data. This type of coding is also called “entropy coding” or “Huffman coding”.
- the color representation of each pixel comprises three components: a luminance component Y and two chrominance components, Cb and Cr.
- the human visual system Since the human visual system (HVS) is the most sensitive to the resolution of the luminance component of an image, the Y pixel values are encoded at full resolution. The human visual system is less sensitive to chrominance information. Downsampling eliminates pixel values that are systematically based on position, which reduces the amount of information to be compressed by other techniques.
- the standard maintains a set of chrominance pixels for each 2x2 neighborhood of luminance pixels. As a result, for a color image, the basic encoding unit of an image is the macroblock.
- the macroblocks of the still image are coded successively, from left to right, and from top to bottom.
- Each macroblock is composed of 6 8x8 blocks: four Y luminance blocks, one Cb chrominance block and one Cr chrominance block. It should be noted that the four luminance blocks cover the same area of the image as each of the chrominance blocks, due to the downsampling of the chrominance information, made to adapt the coding to the sensitivity of the human visual system.
- the invention consists in using the correlation between the DC coefficients in an image, in order to be able to manipulate the appearance of the image in question.
- the possibility of obtaining significant degradations of a JPEG-type still image without performing complicated manipulations is offered by the correlation between the DC coefficients in this image.
- modifying the first coefficient implies modifications on all the values of the coefficients DC which depend on it.
- the image is deeply modified. If we take the case of a color image, each macroblock of an image contains six blocks, each of which begins with a DC coefficient.
- This method is optimal for the visual degradation of the JPEG image using the DC coefficients of the blocks, but it can also be applied to the AC coefficients. It is thus possible to modify some of these coefficients AC in a random manner, to transmit in said complementary information which coefficients have been modified and what is their true value and to reconstitute the original image with this information.
- the sequence is developed using the DC coefficients, but it is agreed that all the following is applicable to the AC coefficients.
- a conventional JPEG decoder When reading the bit stream of a still image, a conventional JPEG decoder identifies the beginning of the encoded image. To avoid confusion between a standard set-top box often called “Set Top Box or STB", the standard JPEG decoder will be called “Player” ("Player” or “Life er”) in the rest of the document. This reader can be made of hardware and / or software. The JPEG reader successively decodes each macroblock of the image. The image is rebuilt when all its macroblocks have been processed.
- the features according to the invention are the correlation coefficients DC contained in the image.
- the device according to the invention will intercalate false DC coefficients of the same nature as the DC coefficients removed and stored in the gate (12) so that the reader
- the JPEG standard of the module (8) will not be disturbed by these modifications that it will ignore and will output a JPEG output image that will be visually incorrect for a human being but correctly JPEG format.
- the JPEG Player on the Enclosure (8) is a Standard JPEG Player and is not in any way modified or affected by changes to the processed image.
- the connection interface (9) is connected to an extended telecommunication network (10), directly or via a local network serving as an access network and consists, for example, of a line interface Subscriber (analog or digital telephone network, DSL, BLR, GSM, GPRS, UMTS, etc.).
- a line interface Subscriber analog or digital telephone network, DSL, BLR, GSM, GPRS, UMTS, etc.
- the visual content is transmitted in a conventional manner via the broadband transmission network (4) of wireless type, cable, satellite, digital terrestrial, DSL, etc. from the server (1) directly via the link (3bis) or via the gate (12) via the link (2) and (3) to the decoder module (8) through the link (5).
- Each visual content thus broadcast can be encrypted or not, and in accordance with the present invention, the JPEG-type image includes modifications as described above. Depending on the parameters chosen by the user or information transmitted by the broadcast server, some visual content thus modified and incomplete are recorded in the hard disk of the housing (8).
- the user When the user wishes to view an image thus recorded in the hard disk of its housing (8) it makes the request in a conventional manner by means of a remote control connected to its housing (8) which then automatically connects to the gate (12). ) via the link (9) type LAN or direct access and through the telecommunications network (10) itself connected to the portal (12) via the link (11).
- the links (9) and (11) remain established and allow the housing (8) to receive the functions and the reordering parameters of the modified DC coefficients of the image.
- the modified DC coefficients of the image thus transmitted are never recorded in the memory of the housing (8) because the reconstituted image is directly displayed on the display screen (6) via the link (7) after having been processed by the case reader (8) from its volatile local memory.
- the modified and / or missing DC coefficients of the image just transmitted by the gate (12) are erased from the local volatile memory of the housing (8).
- the housing (8) comprises a smart card reader that will allow the gate (12) to authenticate the user owning the housing (8).
- the smart card contains said complementary information which has been memorized by the portal (12).
- the smart card also allows the user to make private copies of the visual contents recorded on the hard disk of its set-top box (8).
- the user wants to make a private copy of a visual content, he will do so in a conventional manner on a storage device via the link (7) which connects the box (8) to the display screen (6). ).
- the link (7) which connects the box (8) to the display screen (6).
- he wants to keep a private copy in the hard disk of his case he will indicate it to his case
- the housing (8) which will record the "private copy” information as well as the details of the user on the smart card, in a particular field (84) of this video content recorded on the hard disk (85) of the set-top box (8). Then, whenever the user wants to view this private copy, the housing (8) will automatically connect to the portal (12) and indicate to the latter that the user wants to read his private copy; in return, if the reading of the private copy is possible for this user who has this smart card connected to this housing (8), the set-top box (8) will then receive the DC coefficients modified and / or missing the image and all other information for viewing the still image constituting the private copy.
- the so-called private copy may allow the user to view the same visual content in an unlimited manner or a number of times determined in advance by the service provider who authorized this private copy.
- the present invention also relates to the physical box (8) used by the consumer to access the data. This physical box is located at the user's home. It provides a set of features that manage the appropriate information to be presented according to audience selection and manages the connection and communication with the remote server.
- the physical box corresponding to the interfacing arrangement (8) is designed as a fixed autonomous device with a local memory device, such as an integrated hard disk.
- the physical box corresponding to the interfacing arrangement (8) is designed as a portable (mobile) autonomous device with integrated hard disk and / or disk player (CD, DVD, etc.).
- the autonomous physical box (8) comprises a smart card reader.
- the interfacing arrangement (8) is implemented as an additional card which will be installed in a PC-type computer and will be connected to at least one broadband transmission and broadcast network interface (4). ) and at least one telecommunication network interface (10).
- This card will use the hard disk of the PC computer to record the main content, but will have its own computer and its own volatile memory so as not to leave the malicious PC user the means to access additional information as the modified DC coefficients of still images.
- the multimedia servers (1) and / or (12) comprise means for encoding, transcoding and scrambling visual data, in particular means for adding cryptographic and security information to the visual contents.
- the invention degrades the JPEG image from the visual point of view until it no longer allows the recognition of the objects represented and displayed without having access to the data and additional characteristics, but completely reconstitutes the JPEG image in the image. interfacing arrangement (8) without any loss.
- the present invention will be better understood from the following description presenting the physical basis of the present invention and with reference to FIG. 2 of the appended drawing showing a preferred embodiment of the latter as a nonlimiting example of embodiment particularly well. suitable for cable and satellite networks.
- the complete JPEG image (101) is analyzed by the analysis device (121) of the portal (12) and will thus be separated into two parts.
- a first part (“main content”) is a JPEG image, but whose missing DC coefficients have been processed and which will be sent via the output (122) of the portal to the broadcast broadband transmission network (4).
- the other part of the modified JPEG content (“additional information") will be stored in the buffer (123) of the portal (12).
- the portal (12) will keep in a buffer (123) the changes that have been made to this JPEG content by the analyzer (121) portal (12).
- the processing of the content may be different for each user (8) and / or for each user group (8).
- the buffer (123) of the portal (12) comprises a different memory area for each user.
- a JPEG-type image is modified; in the second example, the device (8) is portable (mobile).
- the portal (121) has chosen the JPEG content (101) that it will have to send to the user (8) to be viewed on its viewing screen (6).
- This user is connected to a digital broadcast cable network (4) and to an ADSL telecommunications network (10).
- the analysis system (121) of the portal (12) will therefore read the incoming JPEG (101) content, in this case an image and it breaks it down into macroblocks (also into slices), then into blocks. This analysis allows him to recognize in the code the DC coefficients, and to substitute some of them by random values, in order to make the image illegible from the human visual point of view.
- the true values of the DC coefficients are stored in the output buffer (123), which will later allow the reconstitution of the starting image in the housing (8), following the inverse scheme.
- one out of two macroblocks has a block (DC coefficient) modified, while respecting the equality of the modification frequencies for the six blocks of a macroblock.
- the new modified JPEG content is then stored in the output buffer (122) for broadcast on the broadcast network (4) through the link (3).
- the DC coefficients substituted for the JPEG image are stored in the buffer (123) of the gate (12).
- the modified JPEG output from the output buffer (122) of the portal (12) is broadcast over the broadband network (4) to one or more users (8).
- Each authorized set-top box (8) which wishes to record this JPEG content thus modified can then read this JPEG content and save it in its local memory (85) such as for example its hard disk.
- This recording initiative is left to the decoder (8) under the control of the portal (12).
- the analysis system (121) had included in the JPEG content, additional data information that specified the recipients of the modified JPEG content.
- the recipients can thus be a particular recipient (8) and only one, a group of recipients (8) or all the decoders (8) connected to the network (4).
- the phase described above corresponds to the first phase of preparation of the JPEG content by the portal (12), its transmission via the broadband network (4) and its registration in a decoder (8).
- This decoder can then display this JPEG content stored in its memory or hard disk (85).
- the synthesis system (87) of the decoder (8) will read the JPEG file from its memory (85) and will send it to a classic JPEG reader (81). If no additional data is received by the synthesis system (87), then the JPEG content that reaches the reader (81) is processed and displayed as it is, which causes significant distortion of the display of the image on the viewing screen (6).
- the modified image that is processed by the synthesis system (87) does not correspond to the original image, since some DC correlation coefficients have been substituted by random coefficients.
- the recorded content is a JPEG content
- the player (81) makes no difference and displays the information on the output screen.
- the synthesis system (87) then establishes a link with the gate (12) via the telecommunications network (10) which is in our example a DSL link. Once this link is established, the synthesis system (87) sends the buffer (123) of the server (12) the substituted correlation coefficients and the data corresponding to the modified image of the content. stored in the memory (85). These correlation coefficients and position data arrive at the synthesis system (87) via the input buffer (86) and are temporarily stored in the volatile memory (88) of the synthesis system (87).
- the synthesis system (87) reconstructs inverse to the analysis process described above, the image modified by the real image and sends the new JPEG image thus reconstituted to the reader (81) to be displayed correctly on the screen (6).
- the correlation coefficients to be substituted and the data associated with this image are used to calculate the image to be displayed on the screen (6). Once this data has been used and the image is displayed on the screen (6), it is erased from the volatile memory (88).
- the gate (12) has verified that the user of the box (8) was allowed to do it. For this, the portal (12) reads the information contained on the smart card (82) of the housing (8) and verifies that this user is authorized to view this visual content. It is only after this verification that the correlation coefficients and the associated data are sent from the buffer (123) to the box (8) corresponding to this user via the network (10). In the example made, the user has also made a private copy of his visual content. The synthesis system (87) has therefore written in part (84) of the memory (85) of the complementary data as well as the number of the smart card (82) and the "private copy" information as data associated with this visual content.
- the synthesis system (87) will analyze this associated data and inform the portal (12) that the user of the decoder (8) reads the private copy. If this function is authorized for this user (8) by the portal (12), the correlation coefficients and the associated data will then be sent by the portal (12) to the buffer (86) as described above. Otherwise, the correlation coefficients and the associated data will not be sent and the user of the decoder (8) will not be able to view the reconstituted JPEG content.
- the JPEG content is processed by the analysis system (12) in the same manner as the JPEG content of the first embodiment.
- the modified main JPEG content is written to and recorded on a CD type physical medium (20) from the output buffer of the analysis system (12).
- the additional information is stored in the buffer (123) and is also recorded in addition to a physical medium (lObis) of credit card format, consisting of a smart card and a flash memory.
- This card (10bis) will be read by card reader (82) of the device (8).
- the device (8) is an autonomous, portable and mobile system.
- the device (8) comprises the synthesis system (87), the standard reader JPEG (81), the two buffers (86) and (83) as well as the disk drive (85).
- the device (8) further comprises an integrated screen (6bis) flat screen type that allows the user to view directly its audiovisual programs on its device (8) autonomous.
- the user of the device (8) introduces into his disk drive (85) a disk (20a) of type (20) identical to that recorded by the analysis system (12).
- This disk (20bis) thus contains a JPEG content of main content type, that is to say with the DC coefficients.
- the disk (20bis) is replaced by a memory card and the disk drive (85) is replaced by a reader of said memory card.
- the user of the device (8) can therefore view this JPEG content on its screen (6bis) integrated in its device.
- the JPEG content will not be visually correct.
- the user introduces in the smart card reader (82) the memory card (10bis) containing the complementary information with the DC coefficients.
- the synthesis system then reconstructs the correct JPEG content from the main content from the disk (20bis) and complementary information from the card (10bis) connected to the reader (82).
- the smart card (10bis) also contains the applications and algorithms that will be executed by the synthesis system (87). In another particular arrangement, the smart card (10bis) contains the data and DC coefficients of several images for the reconstruction of several JPEG images.
- the device (8) comprises a cellular link to a GSM network (10).
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Abstract
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Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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FR0216919 | 2002-12-31 | ||
FR0216919A FR2849567B1 (fr) | 2002-12-31 | 2002-12-31 | Dispositif securise pour la diffusion, l'acces, la copie, l'enregistrement, la visualisation a la demande et la gestion des droits des images photographiques de type jpeg |
PCT/FR2003/050194 WO2004062292A1 (fr) | 2002-12-31 | 2003-12-19 | Methode et appareil de transmition securisee d’images code jpeg |
Publications (1)
Publication Number | Publication Date |
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EP1593268A1 true EP1593268A1 (fr) | 2005-11-09 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP03810005A Ceased EP1593268A1 (fr) | 2002-12-31 | 2003-12-19 | Methode et appareil de transmission securisee d'images code jpeg |
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Country | Link |
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US (1) | US7221802B2 (fr) |
EP (1) | EP1593268A1 (fr) |
AU (1) | AU2003302193A1 (fr) |
FR (1) | FR2849567B1 (fr) |
WO (1) | WO2004062292A1 (fr) |
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Publication number | Priority date | Publication date | Assignee | Title |
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- 2003-12-19 AU AU2003302193A patent/AU2003302193A1/en not_active Abandoned
- 2003-12-19 WO PCT/FR2003/050194 patent/WO2004062292A1/fr not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
---|---|
US7221802B2 (en) | 2007-05-22 |
WO2004062292A1 (fr) | 2004-07-22 |
FR2849567B1 (fr) | 2005-04-01 |
AU2003302193A1 (en) | 2004-07-29 |
US20050281471A1 (en) | 2005-12-22 |
FR2849567A1 (fr) | 2004-07-02 |
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