EP0186444A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Highly efficient coding apparatus for digital video signal
Assignee: Sony Corp
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Filing: 1985-12-19
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Granted: —
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Expires: 2005-12-19
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 23:44
CPC Classifications
H; H04; H04N; H04N19/00; H04N19/90; H04N19/98
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
Apparatus for coding digital video images in a block format allowing compression of the 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 the dynamic range information of the block from said maximum and minimum values; means for subtracting said minimum value from each of the digital video data to generate modified digital video data; means for encoding said modified digital data with the digitized bit number determined by said dynamic range information; and transmitting means for transmitting the output of said encoding means and an additional code per 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
147 words
Apparatus for coding digital video images in a block format allowing compression of the 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 the dynamic range information of the block from said maximum and minimum values; means for subtracting said minimum value from each of the digital video data to generate modified digital video data; means for encoding said modified digital data with the digitized bit number determined by said dynamic range information; and transmitting means for transmitting the output of said encoding means and an additional code per 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
74 words
Apparatus according to claim 1, wherein said encoding means includes a priority encoder supplied with said dynamic range information and for generating 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, the predetermined number being decided by the output of said priority encoder.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 2, wherein said priority encoder generates the encoded data representing the most significant bit position containing a "1" in said dynamic range information.
Claim 5
Dependent Claim
68 words
Apparatus according to claim 2, wherein said encoding means further includes a ROM with a data table having a representative data of an equally divided range of said dynamic range information, a comparator for comparing the output of said priority encoder with a reference value, and a selector for selecting one of the outputs of said bit selector and said ROM according to the output of said comparator.
Claim 6
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 7
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 8
Dependent Claim
21 words
Apparatus according to claim 1, wherein said digital video data in a block represents a one dimensional group of picture elements.
Claim 9
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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