Source: http://www.google.de/patents/US4953196
Timestamp: 2013-06-20 05:06:01
Document Index: 511075388

Matched Legal Cases: ['art 13', 'arts 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 14', 'art 13', 'art 13', 'art 13', 'art 13', 'art 13', 'art 55']

Patent US4953196 - Image transmission system - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Webprotokoll | Anmelden Erweiterte Patentsuche PatenteA video phone comprising an input device for entering input image data to be transmitted, a circuit for digitizing the input image data into digital image data, a memory for storing the digital image data, a first circuit for producing an output image signal based on the digital image data from the memory,...http://www.google.de/patents/US4953196?utm_source=gb-gplus-sharePatent US4953196 - Image transmission system Ver�ffentlichungsnummerUS4953196 APublikationstypErteilung Anmeldenummer07/192,648 Ver�ffentlichungsdatum28. Aug. 1990Eingetragen11. Mai 1988 Priorit�tsdatum13. Mai 1987Auch ver�ffentlicht unterDE3816428A1, DE3816428C2, US5038202 Ver�ffentlichungsnummer07192648, 192648, US 4953196 A, US 4953196A, US-A-4953196, US4953196 A, US4953196A ErfinderMasaaki Ishikawa, Yasunori Ishikawa, Koji Kuwata, Noboru Murayama, Hiroshi Shimura, Koichi SuzukiUrspr�nglich Bevollm�chtigterRicoh Company, Ltd.Patentzitate (19), Nichtpatentzitate (4), Referenziert von (64), Klassifizierungen (6) Externe Links: USPTO, USPTO-Zuordnung, EspacenetImage transmission systemUS 4953196 A Zusammenfassung A video phone comprising an input device for entering input image data to be transmitted, a circuit for digitizing the input image data into digital image data, a memory for storing the digital image data, a first circuit for producing an output image signal based on the digital image data from the memory, a display device for displaying an image of the output image signal, a second circuit for compressing the digital image data from the memory into compressed image data, a telephone part having telephone functions, a line control circuit coupled to a public analog telephone line for selectively coupling the second circuit and the telephone part to the public analog telephone line, and a control device. The control device controls at least the memory and the second circuit so that the compressed image data related to the input image data is read out from the memory and supplied simultaneously to the first and second circuits in an image transmitting mode and the compressed image data related to a voice frequency signal received through the public analog telephone line is stored in the memory and read out therefrom to be supplied to the first circuit in an image receiving mode.
On the other hand, the delta modulation approximates a signal waveform by a staircase wave having an amplitude which varies by .+-.Δ, and obtains one step of the staircase wave as a binary code. Hence, the delta modulation essentially quantizes the difference signal in the DPCM into one bit. According to the delta modulation, the quantization step size (width) is constant with respect to a change in the data.
In the present embodiment, the image to be transmitted is a portrait and the like, and the accuracy required of the image is not extremely high. For example, it is sufficient that the digital RGB signals describe the image in 96 the gradation in four bits (that is, sixteen gradation levels).
In the present embodiment, the output composite color video signal of the video signal output circuit 14 is supplied to the LCD panel 15 for displaying the color still picture. The LCD panel 15 is built into the video phone. The LCD panel 15 is thin and light and has a low power consumption, making it most suited for use in the personal video phone. Taking into consideration the purpose of the present embodiment, it is sufficient that the digital RGB signals read out from the video memory 13 describe the image in a maximum of 256 of the RGB signals describe the gradation in four bits (that is, sixteen gradation levels).
By taking into account the fact that the image to be transmitted is a still picture, the DPCM is used to compress and encode the Y signal. The differential pulse code modulator 26 subjects the Y signal to the DPCM within each frame. On the other hand, by taking into account the visual characteristic of the color difference signals, it is possible to reduce the information quantity of the I and Q signals. For example, as shown in FIG. 4, each of the I and Q signals related to a picture element are selected once in every four picture elements, where "00" through "33" denote picture elements. In other words, when transmitting the Y signal amounting to 96 circuit 27 thins out the I and Q signals so that the I and Q signals amounting to only 48 respective advanced adaptive delta modulators 28 and 29. The advanced adaptive delta modulators 28 and 29 subject the I and Q signals to an advanced adaptive delta modulation which will be described later in the specification.
When a 9600 bps digital modem of the V.29 standard set by the Comite Consultatif International Telegraphique et Telephonique (CCITT) recommendations is used for the modem 36 of the modem line control circuit 18, it is possible to transmit an image made up of 96 elements and described by RGB signals each comprising four bits in approximately 2.9 seconds (=96 image data can essentially be compressed to three bits per picture element by using the information compression procedure described before. The information compression procedure includes the conversion into the Y, I and Q signals, the DPCM within each frame, and the thinning out of the I and Q signals. The present embodiment is thus applicable to the personal video phone because a color still picture of a satisfactory picture quality can be transmitted within a short time.
In the present embodiment, a video memory 13A comprises a first RGB part 13.sub.1 for storing input RGB signals, first and second YIQ parts 13.sub.2 and 13.sub.2 for respectively storing input and output YIQ signals, and a second RGB part 13.sub.4 for storing output RGB signals. For example, the video memory 13A has a memory capacity for storing RGB signals amounting to 256 color signal describing one picture element by six bits. An RGB-to-YIQ signal conversion table (hereinafter simply referred to as RGB-YIQ table) 48 and a YIQ-to-RGB conversion table (hereinafter simply referred to as YIQ-RGB table) 49 are additionally coupled to the system bus 16. The RGB-YIQ table 48 is used to convert RGB signals into the Y, I and Q signals (hereinafter also referred to as YIQ signals). On the other hand, the YIQ-RGB table 49 is used to convert the YIQ signals into the RGB signals.
The image picked up by the video camera 11 is converted into the RGB signals in the video signal input circuit 12, and the RGB signals are once stored in the first RGB part 13.sub.1 of the video memory 13A. The RGB-YIQ table 48 reads out the RGB signals stored in the first RGB part 13.sub.1 and converts the RGB signals into the YIQ signals under the control of the system controller 22, and the YIQ signals are stored in the first YIQ part 13.sub.2 of the video memory 13A.
When carrying out a simulation to display the image which is to be transmitted exactly as it would be received and monitored on the receiving end, the YIQ signals stored in the first YIQ part 13.sub.2 of the video memory 13A are read out and supplied to the video compression and expansion circuit 17 wherein the YIQ signals are compressed and encoded. The compressed image data obtained in the video compression and expansion circuit 17 is then expanded and decoded therein to reproduce the YIQ signals. The reproduced YIQ signals from the video compression and expansion circuit 17 are stored in the second YIQ part 13.sub.3 of the video memory 13A. The YIQ-RGB table 49 then reads out the reproduced YIQ signals stored in the second YIQ part 13.sub.3 and converts the reproduced YIQ signals into RGB signals. The output RGB signals of the YIQ-RGB table 49 are stored in the second RGB part 13.sub.4 of the video memory 13A. The RGB signals stored in the second RGB part 13.sub.4 are read out to the video signal output part 14 and displayed on the LCD panel 15. The still picture displayed on the LCD panel 15 is the image exactly as it would be seen on the receiving end. Therefore, the user (caller) can actually check and see how the receiver will see the image which is transmitted.
On the other hand, when actually starting the image transmission, the YIQ signals stored in the first YIQ part 13.sub.2 are read out and supplied to the video compression and expansion circuit 17 wherein the YIQ signals are compressed and encoded into the compressed image data. The compressed image data is converted into the voice frequency signal in the modem line control circuit 18 and transmitted to the public analog telephone line PL.
When receiving the image data transmitted from the caller, the voice frequency signal on the public analog telephone line PL is received and demodulated into the compressed image data in the modem line control circuit 18. The compressed image data is expanded and decoded into the YIQ signals in the video compression and expansion circuit 17, and the YIQ signals are stored in the second YIQ part 13.sub.3 of the video memory 13A. The YIQ signals stored in the second YIQ part 13.sub.3 are read out and converted into the RGB signals in the YIQ-RGB table 49, and the RGB signals are stored in the second RGB part 13.sub.4. The video signal output circuit 14 reads out the stored RGB signals from the second RGB part 13.sub.4, and the received image is displayed on the LCD panel 15.
Accordingly, the Y signal having five bits/pel can be compressed in average to 2.4 bits/pel with respect to a portrait described by 128 picture elements (pel).
On the other hand, the I and Q signals describe the hue. A high reproducibility is not required of the hue because the visual sensitivity of the human eye is relatively low. Hence, the I and Q signals are thinned out to one picture element for every 2 thin-out circuit 27. The thinned out I and Q signals are subjected to the AADM in the advanced adaptive delta modulators 28 and 29 and encoded. As a result, the I and Q signals are compressed to 0.25 bit/pel.
Therefore, with respect to the portrait described by 128 elements, the RGB signals amounting to a total of twelve (4 bits bits/pel can be compressed in average to 2.9 (2.4+0.25.times.2) bits/pel by use of the AADM. As for the picture quality of the reproduced color still picture, the noise in the Y signal is small and is extremely satisfactory for use in the video phone or the like.
With respect to the input number "9", the input density value DV is "22" and the output buffer value BV of the density buffer 59 is "28". Hence, DV &lt;BV=22-28=-6, and the input of the counter part 55 is "0". Accordingly, this case corresponds to the state F and the predetermined threshold value Ta of "-5" is read out from the Ta-table 58. As a result, the output buffer value BV after the signal transmission/reception is added with "-5" and becomes "23".
Patentzitate Zitiertes PatentEingetragen Ver�ffentlichungsdatum Antragsteller TitelUS3564127 *8. M�rz 196816. Febr. 1971Westinghouse Electric Corp.System of band compression for video signalsUS3842199 *26. Mai 197215. Okt. 1974Rca Corp,UsTelephone image transmission systemUS4057836 *7. Jan. 19778. Nov. 1977Robot Research, Inc.Slow scan television scan converterUS4099202 *2. Mai 19774. Juli 1978Robot Research, Inc.Multiplexed communication of voice signals and slow scan television signals over a common communication channelUS4258387 *17. Okt. 197924. M�rz 1981Grund; ChristianVideo telephoneUS4516151 *28. Mai 19827. Mai 1985Robot Research, Inc.Color slow scan video signal translationUS4560833 *25. Jan. 198424. Dez. 1985Krone GmbhMethod and apparatus for signaling an existing telephone communication between picture telephone apparatusesUS4561020 *6. Juni 198324. Dez. 1985Nec CorporationStill picture transmission apparatusUS4715059 *7. Nov. 198522. Dez. 1987Luma Telecom, Inc.Conversational video phoneUS4802003 *25. Febr. 198731. Jan. 1989Canon Kabushiki KaishaColor picture information transmission systemUS4816901 *27. Apr. 198828. M�rz 1989Universal Video Communications Corp.Method and system for compressing color video dataEP0010813A1 *26. Okt. 197914. Mai 1980Videophone Automatic Systems B.V.A system for transmitting visual information via a low-frequency system, such as a telephone systemGB1568378A * Titel nicht verf�gbarGB2030419A * Titel nicht verf�gbarGB2148653A * Titel nicht verf�gbarGB2158673A * Titel nicht verf�gbarGB2173675A * Titel nicht verf�gbarGB2191907A * Titel nicht verf�gbarGB2206465A * Titel nicht verf�gbar* Vom Pr�fer zitiertNichtpatentzitateReferenz1H. Schonfelder, "To a Concept of a Color Videophone System", Nachrichtentechnische Zeitschrift NTZ, vol. 30, No. 2, pp. 163-168, Feb. 1977.2 *H. Schonfelder, To a Concept of a Color Videophone System , Nachrichtentechnische Zeitschrift NTZ, vol. 30, No. 2, pp. 163 168, Feb. 1977.3NEC, "64 kB TV Telephone", 4/24/89.4 *NEC, 64 kB TV Telephone , 4/24/89.* Vom Pr�fer zitiert Referenziert von Zitiert von PatentEingetragen Ver�ffentlichungsdatum Antragsteller TitelUS5062136 *12. Sept. 199029. Okt. 1991The United States Of America As Represented By The Secretary Of The NavyTelecommunications system and methodUS5130792 *1. Febr. 199014. Juli 1992Usa Video Inc.Store and forward video systemUS5164979 *21. Nov. 199017. Nov. 1992Goldstar Co., Ltd.Security system using telephone lines to transmit video images to remote supervisory locationUS5185655 *2. Okt. 19919. Febr. 1993Tandy CorporationMethod and apparatus for encoding full color video data signals and protocol for encoding sameUS5340978 *21. Apr. 199323. Aug. 1994Lsi Logic CorporationImage-sensing display panels with LCD display panel and photosensitive element arrayUS5363203 *26. Juni 19928. Nov. 1994Sony CorporationStill picture transmitting systemUS5375068 *3. Juni 199220. Dez. 1994Digital Equipment CorporationVideo teleconferencing for networked workstationsUS5432333 *22. Aug. 199411. Juli 1995Lsi Logic CorporationImage-sensing display panels with LCD display panel and photosensor arrayUS5475421 *16. Juli 199212. Dez. 1995Digital Equipment CorporationVideo data scaling for video teleconferencing workstations communicating by digital data networkUS5509009 *20. Mai 199316. Apr. 1996Northern Telecom LimitedVideo and aural communications systemUS5515424 *13. Dez. 19937. Mai 1996At&T Corp.System and method for providing selected video images to local telephone stationsUS5519205 *8. Aug. 199421. Mai 1996Lsi Logic CorporationColor electronic camera including photosensor array having binary diffractive lens elementsUS5529936 *21. Okt. 199425. Juni 1996Lsi Logic CorporationMethod of etching a lens for a semiconductor solid state image sensorUS5546324 *22. Nov. 199413. Aug. 1996Digital Equipment CorporationVideo teleconferencing for networked workstationsUS5563649 *8. M�rz 19958. Okt. 1996Abraham; Charles R.System and method for transmitting video materialUS5568185 *3. Nov. 199422. Okt. 1996Tasco Electronics Co., Ltd.Audio communication band image transceiverUS5594495 *22. Mai 199514. Jan. 1997Digital Equipment CorporationVideo data scaling for video teleconferencing workstations communicating by digital data networkUS5594859 *21. Febr. 199514. Jan. 1997Digital Equipment CorporationGraphical user interface for video teleconferencingUS5608653 *12. Febr. 19964. M�rz 1997Digital Equipment CorporationVideo teleconferencing for networked workstationsUS5610975 *18. Juli 199411. M�rz 1997Canon Kabushiki KaishaVisual telephone apparatusUS5623690 *16. Juli 199222. Apr. 1997Digital Equipment CorporationAudio/video storage and retrieval for multimedia workstations by interleaving audio and video data in data fileUS5696563 *8. M�rz 19959. Dez. 1997Lucent Technologies Inc.Apparatus and methods for performing huffman codingUS5751722 *8. Febr. 199312. Mai 1998Canon Kabushiki KaishaMethod of displaying a frozen image when transmission of image information is suspended in a multimedia systemUS5760834 *8. Aug. 19942. Juni 1998Lsi LogicElectronic camera with binary lens element arrayUS5811320 *24. Okt. 199422. Sept. 1998Rostoker; Michael D.Method of forming image with binary lens element arrayUS5815199 *26. Jan. 199629. Sept. 1998Matsushita Electric Works, Ltd.Interphone with televisionUS5831666 *5. Aug. 19963. Nov. 1998Digital Equipment CorporationVideo data scaling for video teleconferencing workstations communicating by digital data networkUS5850251 *9. Mai 199615. Dez. 1998Canon Kabushiki KaishaVisual telephone apparatusUS5877821 *30. Jan. 19972. M�rz 1999Motorola, Inc.Multimedia input and control apparatus and method for multimedia communicationsUS5977535 *27. Mai 19972. Nov. 1999Lsi Logic CorporationLight sensing device having an array of photosensitive elements coincident with an array of lens formed on an optically transmissive materialUS6157675 *2. Apr. 19985. Dez. 2000Sony CorporationImage transmission device and image transmission methodUS619568312. Febr. 199727. Febr. 2001Compaq Computer CorporationVideo teleconferencing for networked workstationsUS6209985 *17. M�rz 19993. Apr. 2001Brother Kogyo Kabushiki KaishaRecording apparatus and memory mediumUS6226412 *9. Febr. 19981. Mai 2001Barry H. SchwabSecure digital interactive system for unique product identification and salesUS6297843 *30. Sept. 19932. Okt. 2001Intel CorporationSystem providing video compression/encoding for communications across a networkUS632058818. Apr. 199720. Nov. 2001Compaq Computer CorporationAudio/video storage and retrieval for multimedia workstationsUS65773247. Juni 199510. Juni 2003Compaq Information Technologies Group, L.P.Video and audio multimedia pop-up documentation by performing selected functions on selected topicsUS67380879. M�rz 200218. Mai 2004Oz Vision Ltd.Method and system for transferring live video pictures from a video camera to a remote video displayer via a conventional telephone lineUS673835719. Juni 200018. Mai 2004Btg International Inc.Method and apparatus for multiple media digital communication systemUS6909452 *28. M�rz 200021. Juni 2005Omnivision Technologies, Inc.Remote video telephone systemUS705042522. Juni 200423. Mai 2006Btg International Inc.Apparatus for multiple media digital communicationUS707592419. M�rz 200411. Juli 2006Btg International Inc.Methods for multiple media digital communicationUS754834013. Juli 200416. Juni 2009Ricoh Company, Ltd.Method, program, and apparatus for prohibiting a reproduction of an anti-copy document, and a medium storing the programUS774802124. Febr. 200329. Juni 2010American Calcar, Inc.Positional camera and GPS data interchange deviceUS7917369 *18. Apr. 200729. M�rz 2011Microsoft CorporationQuality improvement techniques in an audio encoderUS793017123. Juli 200719. Apr. 2011Microsoft CorporationMulti-channel audio encoding/decoding with parametric compression/decompression and weight factorsUS7952616 *20. Mai 200331. Mai 2011Eastman Kodak CompanyTransmitting digital images to a plurality of selected receivers over a radio frequency linkUS806905010. Nov. 201029. Nov. 2011Microsoft CorporationMulti-channel audio encoding and decodingUS80690523. Aug. 201029. Nov. 2011Microsoft CorporationQuantization and inverse quantization for audioUS809929211. Nov. 201017. Jan. 2012Microsoft CorporationMulti-channel audio encoding and decodingUS811630110. Juli 200614. Febr. 2012Rpx CorporationMethod and apparatus for multiple media digital communication systemUS819042520. Jan. 200629. Mai 2012Microsoft CorporationComplex cross-correlation parameters for multi-channel audioUS825523014. Dez. 201128. Aug. 2012Microsoft CorporationMulti-channel audio encoding and decodingUS825523418. Okt. 201128. Aug. 2012Microsoft CorporationQuantization and inverse quantization for audioUS838626915. Dez. 201126. Febr. 2013Microsoft CorporationMulti-channel audio encoding and decodingUS840107531. Dez. 200819. M�rz 2013General Instrument CorporationHybrid video encoder including real-time and off-line video encodersUS842894311. M�rz 201123. Apr. 2013Microsoft CorporationQuantization matrices for digital audioUSRE4070428. Mai 200428. Apr. 2009Apple Inc.System for terminating multicast channel and data broadcast when at least two second endpoints do not transmit positive acknowledgement message to first endpointUSRE424427. Dez. 20017. Juni 2011Apple Inc.System for terminating multicast channel and data broadcast when at least two second endpoints do not transmit positive acknowledgement message to first endpointCN1072876C *9. Dez. 199410. Okt. 2001美国电报电话公司System and method for providing selected video images to local telephone stationsEP0658035A2 *30. Nov. 199414. Juni 1995AT&amp;T Corp.System and method for providing selected video images to local telephone stationsWO1995009510A1 *15. Aug. 19946. Apr. 1995Intel CorporationTelecommunications system incorporating integrated camera and video compression/encoding apparatusWO2001067769A1 *9. M�rz 200013. Sept. 2001Shahar BelkinMethod and system for transferring live video pictures from a video camera to a remote video displayer via a conventional telephone lineWO2002009132A1 *17. Juli 200131. Jan. 2002Digital Security Controls Ltd.Key fob with slidable cover* Vom Pr�fer zitiertKlassifizierungen US-Klassifikation348/14.14, 348/E07.82, 348/22Internationale KlassifikationH04N7/14 UnternehmensklassifikationH04N7/148 Europ�ische KlassifikationH04N7/14A4DrehenOriginalbildGoogle-Startseite - Sitemap - USPTO-Bulk-Downloads - Datenschutzerkl�rung - Nutzungsbedingungen - �ber Google Patente - Feedback gebenDaten bereitgestellt von IFI CLAIMS Patent Services.© 2012 Google