EP0538013A2
Expired / Lapsed
EP
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Still image transmission system
Assignee: Sony Corp
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Filing: 1992-10-14
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Granted: —
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Expires: 2012-10-14
Abstract
Abstract Image data of four frames in total are stored in four memories and the image data from the four memories are sequentially transmitted, whereby still picture image data having a resolution twice the resolution of a CIF (common intermediate format) image based on a video CODEC recommendation H.261 can be transmitted. In the still picture transmission conforming to the video recommendation H.261, frames four times the transmission frame are prepared and first to fourth frames are stored in first to fourth frame memories (27a to 27d), thereby obtaining a still picture having pixels the number of which is four times the number of pixels of a CIF still picture based on the video CODEC recommendation H.261.
Inventors
- 👤 Katsumi c/o Sony Corporation Tahara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 16:22
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/14; H04N7/141; H04N7/147; H04N5/00; H04N5/44; G; G06; G06T; G06T3/00; G06T3/40; H04N19/00; H04N19/10; H04N19/102; H04N19/103; H04N19/105; H04N19/124; H04N19/134; H04N19/136; H04N19/137; H04N19/146; H04N19/152; H04N19/169; H04N19/17; H04N19/172; H04N19/176; H04N19/189; H04N19/196; H04N19/198; H04N19/42; H04N19/423; H04N19/60; H04N19/61; H04N19/80; H04N19/82; H04N21/00; H04N21/20; H04N21/23; H04N21/238; H04N21/2383; H04N21/40; H04N21/43; H04N21/438; H04N21/4382; H04N19/107
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
An apparatus for transmitting a digital image signal having a motion picture and a still picture in a manner of compressed digital data so that the digital image signal can be transmitted through a transmission channel having a predetermined transmission capacity comprising: (a) means for compressing the digital image signal so that said digital image signal can be transmitted by said transmission channel; (b) means for selecting a transmission mode so that motion picture mode or still picture mode can be selected; and (c) means for storing said digital image signal, said storing means being employed when the still picture mode is selected, said storing means including a plurality of frame memories each of which stores said digital image signal by a different phase, and an output signal of each of said frame memories being applied to said compressing means.
Claim 2
Dependent Claim
12 words
The apparatus according to claim 1, further comprising an analog-to-digital converter (26).
Claim 3
Dependent Claim
32 words
The apparatus according to claim 2, wherein said analog-to-digital converter (26) generates image signals of a plurality of frames by effecting a sampling by a plurality of sampling clocks having different phases.
Claim 4
Dependent Claim
25 words
The apparatus according to claim 3, wherein said image signals of respectively frames generated in response to said sampling clocks are added with identifiers (IDs).
Claim 5
Dependent Claim
37 words
The apparatus according to claim 1, 2, 3, or 4, further comprising local decoders (35, 36, 37, 38, 39), a motion detection and correction circuit (31) and a differential device in order to obtain a difference signal.
Claim 6
Dependent Claim
59 words
The apparatus according to claim 1, 2, 3, 4 or 5, further comprising an orthogonal transform circuit (28) for orthogonally transforming an intra-mode signal, an orthogonal transform circuit (33) for orthogonally transforming an inter-mode signal (output of said differential device (32)) and a selecting and extracting device (judging circuit (30)) for electing said orthogonal transform circuits (28) and (33).
Claim 7
Independent Claim
103 words
An apparatus for receiving a digital image signal having a motion picture and a still picture in a manner of compressed digital data so that the digital image signal can be received through a reception channel having a predetermined reception capacity comprising: (a) means for expanding the digital image signal so that said digital image signal can be received by said reception channel; (b) means for receiving a reception mode so that motion picture mode or still picture mode can be selected; and (c) means for storing said digital image signal, said storing means being employed when the still picture mode is selected.
Claim 8
Dependent Claim
32 words
The apparatus according to claim 7, wherein said storing means includes a plurality of frame memories (53a, 53b, 53c, 53d) each of which stores said digital image signal by a different phase.
Claim 9
Dependent Claim
35 words
The apparatus according to claim 7, further comprising a selector (51) for allowing said digital image signal to be stored in said frame memories (53a, 53b, 53c, 53d) when the still picture mode is selected.
Claim 10
Independent Claim
134 words
A method of transmitting a digital image signal having a motion picture and a still picture in a manner of compressed digital data so that the digital image signal can be transmitted through a transmission channel having a predetermined transmission capacity comprising the steps of: compressing the digital image signal so that said digital image signal can be transmitted by said transmission channel; selecting a transmission mode so that motion picture mode or still picture mode can be selected; and storing said digital image signal, said storing step being employed when the still picture mode is selected, said storing step including a plurality of frame memories each of which stores said digital image signal by a different phase, and an output signal of each of said frame memories being applied to said compressing means.
Claim 11
Independent Claim
97 words
A method of receiving a digital image signal having a motion picture and a still picture in a manner of compressed digital data so that the digital image signal can be received through a reception channel having a predetermined reception capacity comprising the steps of: expanding the digital image signal so that said digital image signal can be received by said reception channel; receiving a reception mode so that motion picture mode or still picture mode can be selected; and storing said digital image signal, said storing step being employed when the still picture mode is selected.
References Cited (Backward Citations)
No citation records indexed.
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