EP0185533A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
High efficiency technique for coding a digital video signal
Assignee: Sony Corp
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Filing: 1985-12-16
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Granted: —
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Expires: 2005-12-16
Abstract
Abstract Coding apparatus for coding digital video data in the form of a block data to a compressed video data, comprises first detecting means for detecting a maximum value of the digital video data of plural picture elements in said block, second detecting means for detecting a minimum value of the digital video data of plural picture elements in said block, means for generating a dynamic range information of the block from said maximum and minimum values, means for subtracting said minimum value from each of the digital data to generate modified digital video data, means for encoding said modified digital video data with the fixed digitized bit number less than that of original digital video data, and transmitting means for transmitting the output of said encoding means and an additional code per one block formed of at least two of said maximum value, minimum value, and a signal according to said dynamic range information.
Inventors
- 👤 Tetsujiro Kondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 13:29
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/98
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
154 words
Coding apparatus for coding digital video data in the form of a block data to a compressed video data, comprising: first detecting means for detecting a maximum value of the digital video data of plural picture elements in said block, second detecting means for detecting a minimum value of the digital video data of plural picture elements in said block, means for generating a dynamic range information of the block from said maximum and minimum values, means for subtracting said minimum value from each of the digital data to generate modified digital video data, means for encoding said modified digital video data with the fixed digitized bit number less than that of original digital video data, and transmitting means for transmitting the output of said encoding means and an additional code per one block formed of at least two of said maximum value, minimum value, and a signal according to said dynamic range information.
Claim 2
Dependent Claim
154 words
Coding apparatus for coding digital video data in the form of a block data to a compressed video data, comprising: first detecting means for detecting a maximum value of the digital video data of plural picture elements in said block, second detecting means for detecting a minimum value of the digital video data of plural picture elements in said block, means for generating a dynamic range information of the block from said maximum and minimum values, means for subtracting said minimum value from each of the digital data to generate modified digital video data, means for encoding said modified digital video data with the fixed digitized bit number less than that of original digital video data, and transmitting means for transmitting the output of said encoding means and an additional code per one block formed of at least two of said maximum value, minimum value, and a signal according to said dynamic range information.
Claim 3
Dependent Claim
4 words
Apparatus according to claim
Claim 4
Dependent Claim
57 words
1, wherein said encoding means includes a reference level signal generator supplied with said dynamic range information for generating reference level signal comparator means for comparing said modified digital video data and said reference level signal and priority encoding means supplied with the output of said comparator means and for generating the output of said encoding means.
Claim 5
Dependent Claim
57 words
1, wherein said encoding means includes a reference level signal generator supplied with said dynamic range information for generating reference level signal comparator means for comparing said modified digital video data and said reference level signal and priority encoding means supplied with the output of said comparator means and for generating the output of said encoding means.
Claim 6
Dependent Claim
68 words
Apparatus according to claim 1, wherein said encoding means includes level dividing means supplied with said dynamic range information for level dividing said dynamic range information by the number according to said fixed digitized bit number, and a digital divider for dividing said modified digital video data by the output of said level dividing means, the output of said digital divider being the output of said encoding means.
Claim 7
Dependent Claim
85 words
Apparatus according to claim 1, wherein said encoding means includes a priority encoding means supplied with sa.id dynamic range information and for generating an encoded data with a smaller number of bits than that of said dynamic range information, and a bit selector supplied with said modified digital video data and for selecting the predetermined number of bits of said modified digital video data, said predetermined number being equal to said fixed digitized bit number and said bit selector being controlled by said encoded data.
Claim 8
Dependent Claim
25 words
Apparatus according to claim 4, wherein said priority encoder generates the encoded data representing the most significant bit position containing "1" said dynamic range information.
Claim 9
Dependent Claim
24 words
Apparatus according to claim 1, wherein said transmitting means includes a parity adding circuit for adding parity data at least to said additional code.
Claim 10
Dependent Claim
21 words
Apparatus according to claim 1, wherein said digital video data in each block represents a two dimensional group of picture elements.
Claim 11
Dependent Claim
21 words
Apparatus according to claim 1, wherein said digital video data in each block represents a one dimensional group of picture elements.
Claim 12
Dependent Claim
23 words
Decoding apparatus comprising means for decoding digital video data which has been encoded using the apparatus of any one of the preceding claims.
References Cited (Backward Citations)
No citation records indexed.
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