EP0523618B1
Expired / Lapsed
EP
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Picture codec and teleconference terminal equipment
Assignee: Hitachi Ltd
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Filing: 1992-07-14
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Granted: 1997-10-08
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Expires: 2012-07-14
Abstract
No abstract record available.
Inventors
- 👤 Yoji Shibata
- 👤 Masaaki Takizawa
- 👤 Hitoshi Matsushima
- 👤 Hiroshi Yoshikawa
- 👤 Atsuo Yoshida
- 👤 Toru Ebihara
- 👤 Jun Furuya
- 👤 Yukinobu Maruyama
- 👤 Takehiko Yamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 06:42
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/10; H04N1/1004; G; G06; G06T; G06T1/00; G06T1/20; G06T9/00; H04N1/42; H04N5/00; H04N5/44; H04N5/445; H04N5/45; H04N7/00; H04N7/14; H04N7/141; H04N7/142; H04N7/147; H04N7/148; H04N7/15; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0435; H04Q11/0457; H04Q11/0471; H04Q2213/00; H04Q2213/13034; H04Q2213/13091; H04Q2213/13096; H04Q2213/13106; H04Q2213/13175; H04Q2213/13176; H04Q2213/13179; H04Q2213/13204; H04Q2213/13209; H04Q2213/1332; H04Q2213/13337; H04Q2213/204; H04Q2213/337
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
333 words
A picture codec for a teleconference terminal equipment, to which an analog picture signal as well as coded still picture data and coded motion picture data which have been transferred from the other side of a teleconference are input, and from which coded picture data to be transmitted to the other side of the teleconference and an analog picture signal for displaying a picture are output, comprising: an analog-to-digital converter (200) which converts the input analog picture signal into digital picture data; a still picture coder (202) which codes said digital picture data produced by said analog-to-digital converter, so as to deliver coded still picture data; a video coder (201) which codes said digital picture data produced by said analog-to-digital converter, so as to deliver coded picture data; a selector (212) which selects either of said coded motion picture data delivered from said video coder and said coded still picture data delivered from said still picture coder, and which delivers the selected picture data as the output coded picture data; a still picture decoder (207) which decodes the input coded still picture data into decoded still picture data; a video decoder (206) which decodes the input coded motion picture data into decoded motion picture data; a picture-in-picture processor (205) comprising a still picture frame memory (302) which stores therein said decoded still picture data delivered from said still picture decoder, wherein said picture-in-picture processor generates picture-in-picture frame data on the basis of said decoded still picture data stored in said still picture frame memory, said decoded motion picture data delivered from said video decoder and said digital picture data delivered from said analog-to-digital converter; said picture-in-picture frame data forming a picture-in-picture frame which includes at least two of said decoded still picture data, said decoded motion picture data and said digital picture data; and a digital-to-analog converter (220) which converts said picture-in-picture frame data generated by said picture-in-picture processor into the output analog picture signal, and which delivers said output analog picture signal.
Claim 2
Dependent Claim
21 words
A picture codec IC, comprising the picture codec as defined in claim 1, which is built in as an integrated circuit.
Claim 3
Dependent Claim
106 words
A picture codec as defined in claim 1, wherein said picture-in-picture processor includes: a video frame memory (303) which stores therein said decoded motion picture data delivered from said video decoder; a self-picture frame memory (301) which stores therein said digital picture data delivered from said analog-to-digital converter; fetch control means (308, 309) for fetching the picture data items for said picture-in-picture frame to-be-formed from the corresponding ones of said frame memories in accordance with a display timing of said picture-in-picture frame to-be-formed; and multiplex means (311) for multiplexing said picture data items fetched from said fetch control means and then delivering the multiplexed picture data.
Claim 4
Dependent Claim
130 words
A teleconference terminal equipments comprising: the picture codec as defined in claim 1; a communication control unit (9) which transmits either of said coded still picture data and said coded motion picture data delivered from said picture codec to the other side of the teleconference through a digital communication channel, and which receives said coded still picture data and said coded motion picture data transferred from the other side of a teleconference through said digital communication channel and then delivers the received said coded still picture data and said coded motion picture data to said picture codec; a camera (1) which delivers the analog picture signal to said picture codec; and a display unit (2) which displays a picture indicated by said output analog picture signal of said picture codec.
Claim 5
Dependent Claim
95 words
A picture codec as defined in claim 1, wherein said still picture coder (202) performs the coding in accordance with coding rules which conform to the JPEG algorithm of the ISO Standard, said still picture decoder (207) performs the decoding in accordance with decoding rules which conform to said JPEG algorithm of said ISO Standard, said video coder (201) performs the coding in accordance with coding rules which conform to CCITT Recommendation H. 261, and said video decoder (206) performs the decoding in according with decoding rules which conform to said CCITT recommendation H. 261.
Claim 6
Dependent Claim
96 words
A teleconference terminal equipment as defined in claim 4, wherein said still picture coder (202) performs the coding in accordance with coding rules which conform to the JPEG algorithm of the ISO Standard, said still picture decoder (207) performs the decoding in accordance with decoding rules which conform to said JPEG algorithm of said ISO Standard, said video coder (201) performs the coding in accordance with coding rules which conform to CCITT Recommendation H. 261, and said video decoder (206) performs the decoding in accordance with decoding rules which conform to said CCITT Recommendation H. 261.
References Cited (Backward Citations)
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