EP0674448A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Video image reproduction with high speed
Assignee: NEC Corp
•
Filing: 1995-03-27
•
Granted: —
•
Expires: 2015-03-27
Abstract
Abstract Processing is carried out in the encoder of a sequence of video image data to add information into the digital data stream in order to facilitate the decision in the decoder, if and how to decode the single frames of the complete stream. The decoder analyses the headers of the frames in case its processing power doesn't permit the decoding of the complete data, in order to extract such frames only, which are indispensable or easy to be decoded. Possible indicators are those for 'B' frames, those for frames with no motion, those with a difference to the previous ones below a certain threshold, those with irrelevant high frequency coefficients and those with a code easily decoded (fixed length).
Inventors
- 👤 Hiroaki C/O Nec Corp. Ueda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 09:33
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N19/00; H04N19/10; H04N19/169; H04N19/17; H04N19/174; H04N19/42; H04N19/423; H04N19/50; H04N19/503; H04N19/51; H04N19/577; H04N19/60; H04N19/61; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/783; H04N19/102; H04N19/13; H04N19/30; H04N19/70; H04N19/90; H04N19/91; H04N5/84; H04N5/85; H04N9/8045; H04N9/8047
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
254 words
An image transmission system comprising: preparing means (11, 12, 13, 14, 15, 16, 17, 18, 19, 20) for preparing an intraframe encoded image by segmenting an image into a plurality of blocks and by compressing and encoding each block by the use of discrete cosine transform; preparing means (11, 12, 13, 14, 15, 16, 17, 18, 19, 20) for preparing an interframe encoded image by searching for a particular block at which a difference is smallest between a current frame and either a preceding frame or both preceding and succeeding frames in a time sequential order, by carrying out motion compensation on said each block, and by compressing and encoding a differential value between each block of said current frame and a motion compensated block by the use of discrete cosine transform; and multiplexing and transmitting means (11, 12, 13, 14, 15, 16, 17, 18, 19, 20) for multiplexing and transmitting said intraframe encoded image and said interframe encoded image together with a header, characterized in that: said image transmission system has transmitting means (21, 22) for transmitting an identifier for identifying at least one of fixed parameters including a type of said interframe encoded image to be transmitted with said intraframe encoded image and a motion compensation value fixed as said fixed parameters which are transmitted to a reproducing side together with said header; and expansion processing means (21, 22) for carrying out expansion processing after detecting said identifier in said header to thereby identify said fixed parameter of an input video code.
Claim 2
Dependent Claim
298 words
An image reproducing device comprising: expanding and reproducing means (11, 12, 13, 14, 15, 16, 17, 18, 19, 20) for expanding and reproducing a video code comprising an intraframe encoded image and an interframe encoded image which are multiplexed together with a header having a fixed parameter identifier, said intraframe encoded image being prepared by segmenting an image into a plurality of blocks and by compressing and encoding each block by the use of discrete cosine transform, said interframe encoded image being prepared by searching for a particular block at which a difference is smallest between a current frame and a preceding frame in a time sequential order, by carrying out motion compensation on said each block, and by compressing and encoding a differential value between each block of said current frame and a motion compensated block by the use of discrete cosine transform, characterized in that: said image reproducing device has header analyzing means (11, 21, 22) for judging, with reference to said header contained in said video code supplied as an input video code, whether or not said input video code exclusively comprises said intraframe encoded image and said interframe encoded image with a type of said interframe encoded image fixed; and expansion processing means (21, 22) for detecting whether or not said input video code is said intraframe encoded image when said header analyzing means judges that said input video code is such a code that the type of said interframe encoded image is fixed, for carrying out expansion processing of said intraframe encoded image when it is detected that said input video code is said intraframe encoded image, and for carrying out expansion processing of said interframe encoded image when it is detected that said input video code is not said intraframe encoded image.
Claim 3
Dependent Claim
55 words
An image reproducing device as claimed in Claim 2 (Fig. 7), characterized in that said input video code has a structure in which a transmission interval between said intraframe encoded image and a next intraframe encoded image is constant, said interframe encoded image being transmitted within said transmission interval (step 61, 62, 63, 64, 65).
Claim 4
Dependent Claim
224 words
An image reproducing device comprising: expanding and reproducing means (11, 12, 13, 14, 15, 16, 17, 18, 19, 20) for expanding and reproducing a video code comprising an intraframe encoded image and an interframe encoded image which are multiplexed together with a header having a fixed parameter identifier, said intraframe encoded image being prepared by segmenting an image into a plurality of blocks and by compressing and encoding each block by the use of discrete cosine transform, said interframe encoded image being prepared by compressing and encoding, for said each block, a differential value between a block of a current frame and a block of either a preceding frame or both preceding and succeeding frames in a time sequential order by the use of discrete cosine transform, characterized in that: said image reproducing device has header analyzing means (11, 21, 22) for judging, with reference to said header contained in said video code supplied as an input video code, whether or not said input video code is a code having said interframe encoded image with a motion compensation value fixed; and expansion processing means (21, 22) for carrying out expansion processing of said input video code with motion compensation processing omitted when said header analyzing means (11, 21, 22) judges that said input video code is a code with a motion compensation value fixed.
Claim 5
Dependent Claim
248 words
An image reproducing device comprising: expanding and reproducing means (11, 12, 13, 14, 15, 16, 17, 18, 19, 20) for expanding and reproducing a video code comprising an intraframe encoded image and an interframe encoded image which are multiplexed together with a header and for displaying a video reproduction on a display section, said intraframe encoded image being prepared by segmenting an image into a plurality of blocks and by compressing and encoding each block by the use of discrete cosine transform, said interframe encoded image being prepared by searching for a particular block at which a difference is smallest between a current frame and either a preceding frame or both preceding and succeeding frames in a time sequential order, by carrying out motion compensation on said each block, and by compressing and encoding a differential value between each block of said current frame and a motion compensated block by the use of discrete cosine transform, characterized in that: said image reproducing device has expansion processing means (21, 22) for expanding and reproducing an input video code; total differential value calculating means (22) for calculating a cumulative value of a total differential value per frame in said interframe encoded image expanded by said expansion processing means; and control means (18, 19, 20, 21) for comparing said cumulative value and a threshold value to inhibit said display section from renewing display of output video data produced by said expansion processing means until said cumulative value exceeds said threshold value.
Claim 6
Dependent Claim
176 words
An image reproducing device comprising: reproducing means (211, 212, 213, 214, 215, 216, 217, 218, 219) for reproducing a moving image compressed and encoded by the use of a high-efficiency encoded intraframe code and a high-efficiency encoded interframe code, said intraframe code being prepared by segmenting said image into small blocks, by carrying out discrete cosine transform on each block, and by quantizing a result of said transform, said interframe code being prepared by segmenting said image into small blocks, by searching for a particular block at which a difference is smallest between a current frame and preceding and succeeding frames, by carrying out motion compensation on each block, by calculating a difference between each block of the current frame and each block of a motion compensated frame, by carrying out discrete cosine transform on a differential block, and by quantizing a result of said transform, characterized in that: said image reproducing device has judging means (211, 224, 225, 226, 227) for judging whether or not a code has a fixed parameter by analyzing said code.
Claim 7
Dependent Claim
25 words
An image reproducing device as claimed in Claim 6, characterized by further comprising means for enlarging an image to be displayed (Figs. 16(A), (B), (C)).
Claim 8
Dependent Claim
38 words
An image reproducing device as claimed in Claim 6 or 7, characterized by further comprising means for carrying out expansion processing on condition that a picture structure is fixed to said intraframe code alone (Figs. 19(A), (B), (C)).
Claim 9
Dependent Claim
36 words
An image reproducing device as claimed in Claim 6 or 7, characterized by further comprising means for carrying out expansion processing on condition that a slice width is fixed to a fixed value (Figs. 20(A), (B)).
Claim 10
Independent Claim
36 words
A device as claimed in any of claims 6 to 9, characterized by further comprising means for calculating inverse discrete cosine transform in the assumption that high frequency components are equal to zero (Figs. 22(A), (B)).
Claim 11
Independent Claim
38 words
A device as claimed in any of claims 6 to 10, characterized by further comprising means for carrying out decoding on condition that a code type is fixed to a fixed length code alone (Figs. 25, 26, 27).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.