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EP0542261A2
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Method of performing high efficiency coding of image signal and system therefor
Assignee: Japan Broadcasting Corp
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Filing: 1992-11-12
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Granted: —
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Expires: 2012-11-12
Abstract
Abstract A system for performing high efficiency coding of an image signal includes a differential signal generating section (51), a processing section (12, 13), a supply section (61), a coefficient train outputting section (14, 24), and a code assigning section (54). The differential signal generating section (51) generates a differential image signal between a current image signal inputted thereto and a prediction image signal inputted thereto for the current image signal with respect to a target block. The processing section (12, 13) executes processing of a one-dimensional orthogonal transform and a quantization for an image signal, input from the supply section (61). The coefficient train outputting section (14, 24) generates a quantization coefficient train from the quantization coefficients. The code assigning section (54) assigns a code to each quantization coefficient of the train to generate a transmission signal.
Inventors
- 👤 Yoshiaki Co Nhk Hoso Gijutsu Kenkyusho Shishikui
- 👤 Yukihiro c/o NHK Hoso Gijutsu Kenkyusho Nishida
- 👤 Eisuke c/o NHK Hoso Gijutsu Kenkyusho Nakasu
- 👤 Yoshimichi Co Nhk Hoso Gijutsu Kenkyusho Ohtsuka
- 👤 Hiroshi c/o NHK Hoso Gijutsu Kenkyusho Nakanishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 13:20
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/10; H04N19/169; H04N19/184; H04N19/102; H04N19/103; H04N19/107; H04N19/12; H04N19/122; H04N19/134; H04N19/136; H04N19/14; H04N19/157; H04N19/159; H04N19/17; H04N19/176; H04N19/60; H04N19/61; H04N19/63; H04N19/115; H04N19/146; H04N19/149; H04N19/15; H04N19/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
115 words
A system for performing high efficiency coding of an image signal comprising: processing means including one-dimensional processing means (12) for executing processing of a one-dimensional orthogonal transform for an inputted objective image signal, with respect to a target block, to generate transform coefficients; supply means for supplying said processing means with said objective image signal with respect to the target block; quantizing means (13, 23) for quantizing the transform coefficients from said processing means to generate quantization coefficients; coefficient train outputting means (14, 24) for generating a quantization coefficient train from the quantization coefficients; and code assigning means (54) for assigning a code to each quantization coefficient of the train to generate a transmission signal.
Claim 2
Dependent Claim
144 words
A system according to claim 1, wherein said supply means further comprises: differential signal generating means (51) for generating a differential image signal between a current image signal inputted thereto and a prediction image signal inputted thereto for said current image signal with respect to the target block, said current image signal and said differential image signal each comprising a plurality of blocks and the target block being one of the plurality of blocks; mode means (52) for comparing said current image signal with said differential image signal and selectively generating a mode signal indicating of one of an intra mode and an inter mode based on the comparison result; and objective image signal supply means responsive to the mode signal for selectively supplying one of said differential image signal and said current image signal as said objective image signal to said processing means.
Claim 3
Dependent Claim
109 words
A system according to claim 1 or 2, wherein said supply means further comprises sub-mode means (72) for selectively generating a sub-mode signal indicative of one of a one-dimensional horizontal sub-mode and a two-dimensional sub-mode based on the characteristic of said objective image signal, and wherein said processing means further comprises: two-dimensional processing means (22) for executing processing of a two-dimensional orthogonal transform for said objective image signal inputted thereto, with respect to the target block, to generate the transform coefficients; and selecting means responsive to the sub-mode signal for selecting one of said one- and two-dimensional processing means to supply said objective image signal to the selected one.
Claim 4
Dependent Claim
29 words
A system according to claim 3, wherein said sub-mode means generates the sub-mode signal based on a correlation between pixels of said objective image signal in the vertical direction.
Claim 5
Dependent Claim
75 words
A system according to claim 3 or 4, wherein said sub-mode means further comprises means for the sub-mode signal indicative of one-dimensional vertical sub-mode and a zero-dimensional sub-mode based on a characteristic of said objective image signal in a horizontal direction in addition to the vertical direction, and said processing means further comprises means responsive to the sub-mode signal indicative of the zero-dimensional sub-mode for directly supplying said objective image signal to said quantizing means.
Claim 6
Independent Claim
65 words
A system according to any one of claims 1 to 5, wherein said processing means comprises: horizontal one-dimensional processing means for performing a horizontal one-dimensional orthogonal transform; vertical one-dimensional processing means for performing a vertical one-dimensional orthogonal transform; and by-pass means for selectively by-passing said horizontal or vertical one-dimensional processing means, and wherein said two-dimensional processing means includes said horizontal and vertical one-dimensional processing means.
Claim 7
Independent Claim
67 words
A system according to any one of claims 2 to 6, further comprising: extracting means for extracting an image signal having a low horizontal frequency component and a high vertical frequency component from a video signal to supply the extracted image signal as said current image signal to said differential signal generating means or the extracted image signal as said objective image signal to said processing means.
Claim 8
Independent Claim
40 words
A system according to any one of claims 1 to 7, wherein said one-dimensional orthogonal transform processing and said two-dimensional orthogonal transform processing are a one-dimensional discrete cosine transform (1D-DCT) processing and a two-dimensional discrete cosine transform (2D-DCT) processing, respectively.
Claim 9
Independent Claim
39 words
A system according to any one of claims 2 to 8, further comprising means for generating the prediction image signal from the current image signal and the quantization coefficients to supply the same to said differential signal generating means.
Claim 10
Independent Claim
134 words
A method of highly efficiently coding image signals comprising the steps of: generating a differential image signal between a current image signal and a prediction image signal for said current image signal with respect to a target block, said current image signal and said differential image signal each comprising a plurality of blocks and the target block being one of the plurality of blocks; selectively performing one-dimensional orthogonal transform processing or quantization processing on said differential image signal as an objective image signal based on a result of comparison between said current image signal and said differential image signal with respect to the target block, to generate quantization coefficients; generating a quantization coefficient string from the quantization coefficients; and assigning a code to each quantization coefficient of the string to generate a transmission signal.
Claim 11
Dependent Claim
92 words
A method according to claim 10, wherein said step of selectively performing processing further comprises the steps of: detecting a correlation between pixels in a vertical direction of said objective image signal; determining whether or not the detected correlation is larger than a predetermined value; and when the detected correlation is determined to be larger than the predetermined value, performing processing of a two-dimensional orthogonal transform and a quantization on said objective image signal, in place of the processing of the one-dimensional orthogonal transform and the quantization, to generate the quantization coefficients.
Claim 12
Dependent Claim
76 words
A method according to claim 10, wherein said step of selectively performing processing comprises the steps of: comparing signal power between said current image signal and said differential image signal with respect to the target block; and when signal power of said differential image signal is determined to be less than signal power of said current image signal, performing processing of one-dimensional orthogonal transform and quantization on said differential image signal to generate the quantization coefficients.
Claim 13
Dependent Claim
52 words
A method according to claim 12, wherein said step of selectively performing processing further comprises the step of: when the signal power of said differential image signal is determined to be not less than the signal power of said current image signal, specifying the current image signal as an objective image signal.
Claim 14
Dependent Claim
89 words
A method according to claim 13, wherein said step of selectively performing processing further comprises the steps of: detecting the correlation between pixels in the vertical direction of said objective image signal; determining whether or not the detected correlation is larger than a predetermined value; and when the detected correlation is determined to be larger than the predetermined value, performing the processing of two-dimensional orthogonal transform and quantization on said objective image signal, in place of the processing of one-dimensional orthogonal transform and quantization, to generate the quantization coefficients.
Claim 15
Dependent Claim
37 words
A method according to claim 10, wherein said current image signal is a signal having a low horizontal frequency component and a high vertical frequency component, and said prediction image signal is a motion compensated prediction signal.
Claim 16
Dependent Claim
16 words
A method according to claim 10, wherein said one-dimensional orthogonal transform is one-dimensional discrete cosine transform.
References Cited (Backward Citations)
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