EP0413570A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Picture data compression
Assignee: Sony Corp
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Filing: 1990-08-15
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Granted: —
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Expires: 2010-08-15
Abstract
Abstract A highly efficient coding apparatus for picture data for splitting an input digital picture signal into component data of plural frequency bands and compressing and encoding the data of the each band, includes an encoder supplied with one or more data containing at least the component data of the band on the lowest frequency side among data of the plural bands and adaptive to dynamic range. The encoder comprises a block segmentation circuit for converting input data into data of a block structure, a detection circuit for detecting a maximum value MAX, a minimum value MIN and a dynamic range DR of the blocks, a subtraction circuit for subtracting the maximum value MAX or the minimum value MIN from the input data, and a quantisation circuit for encoding an output signal of the subtraction circuit to be adaptive to the dynamic range DR.
Inventors
- 👤 Koji Kageyama
- 👤 Hugo Gaggioni
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 15:36
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/60; H04N19/63; H04N19/10; H04N19/102; H04N19/124; H04N19/90; H04N19/98
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
275 words
A highly efficient coding apparatus for coding digital picture data to provide compressed picture data, comprising: filter bank means arranged to be supplied with said digital picture data and for splitting the same into a plurality of component data in different frequency bands; a plurality of encoding means each of which is arranged to be supplied with respective component data from the filter bank means and for encoding the component data to generate compressed component data; and combining means for combining the compressed component data from said plurality of encoding means to provide said compressed picture data, wherein at least one of said plurality of encoding means for encoding the component data having the lowest frequency band incudes block segmentation means for forming blocks of component data representing plural picture elements, first and second detecting means for detecting maximum and minimum values, respectively, of the component data representing the plural picture elements in each of said blocks, means for generating dynamic range information for each said block from said maximum and minimum values for the respective block, means for generating modified component data for each said block as the difference between each of the digital picture data and one of said maximum and minimum values for said respective block, means for encoding said modified component data with a digitised bit number less than the number of bits in said component data so as to provide the compressed component data, and output means for outputting the compressed data and an additional code for each said respective block formed of at least two of said maximum and minimum values and-a signal corresponding to said dynamic range information.
Claim 2
Dependent Claim
275 words
A highly efficient coding apparatus for coding digital picture data to provide compressed picture data, comprising: filter bank means arranged to be supplied with said digital picture data and for splitting the same into a plurality of component data in different frequency bands; a plurality of encoding means each of which is arranged to be supplied with respective component data from the filter bank means and for encoding the component data to generate compressed component data; and combining means for combining the compressed component data from said plurality of encoding means to provide said compressed picture data, wherein at least one of said plurality of encoding means for encoding the component data having the lowest frequency band incudes block segmentation means for forming blocks of component data representing plural picture elements, first and second detecting means for detecting maximum and minimum values, respectively, of the component data representing the plural picture elements in each of said blocks, means for generating dynamic range information for each said block from said maximum and minimum values for the respective block, means for generating modified component data for each said block as the difference between each of the digital picture data and one of said maximum and minimum values for said respective block, means for encoding said modified component data with a digitised bit number less than the number of bits in said component data so as to provide the compressed component data, and output means for outputting the compressed data and an additional code for each said respective block formed of at least two of said maximum and minimum values and-a signal corresponding to said dynamic range information.
Claim 3
Dependent Claim
22 words
A highly efficient coding apparatus according to claim 1, wherein said filter bank means includes horizontal filter means and vertical filter means.
Claim 4
Dependent Claim
93 words
A highly efficient coding apparatus according to claim 2, wherein said filter bank means includes horizontal low-pass filter means and horizontal high-pass filter means each being supplied with said digital picture data, first vertical low-pass filter means and first vertical high-pass filter means, each being connected to said horizontal low-pass filter means , and second vertical low-pass filer means and second vertical high-pass filter means, each being connected to said horizontal high-pass filter means, and said component data having the lowest frequency band is the output of said first vertical low-pass filter means.
Claim 5
Dependent Claim
34 words
A highly efficient coding apparatus according to any one of claims 1 to 3, wherein at least one other one of said encoding means includes a re-quantising means and a variable length coding means.
Claim 6
Dependent Claim
28 words
A highly efficient coding apparatus according any one of the preceding claims, wherein said filter bank means includes means for reducing the sampling frequency of said component data.
Claim 7
Dependent Claim
62 words
A decoding apparatus for decoding a signal compressed by the apparatus of any one of claims 1 to 5 and including respective means for decoding the data encoded by the encoding means, including means responsive to said additional code to decode the modified component data and means for combining the data from the respective decoding means, thereby to decompress the picture signal.
References Cited (Backward Citations)
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