Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
218 words
A high efficiency coding apparatus for coding digital video data in a block format allowing video data compression, characterised by first (32) and second (33) detecting means for detecting respective extreme values of the digital video data of plural picture elements in said block; the extreme value detected by the first detecting means being the maximum of said values, and that detected by the second detecting means being the minimum; means for generating dynamic range information (4) of the block from said maximum and minimum values: means (45) for forming the difference between one of said extreme values from each of the digital video data to generate modified digital video data: means for generating a distribution table (5) of said dynamic range information during a predetermined period; means for determining an encoding bit number for each block during said predetermined period from said distribution table and a capacity of data transmission means; encoding means (7) for encoding said modified digital video data with the bit number determined by said determining means; and transmitting means for transmitting an output of said encoding means, a first additional code per block formed of at least two of said maximum value, minimum value and a signal based on said dynamic range information, and a second additional code for each said predetermined period.
Claim 2
Dependent Claim
218 words
A high efficiency coding apparatus for coding digital video data in a block format allowing video data compression, characterised by first (32) and second (33) detecting means for detecting respective extreme values of the digital video data of plural picture elements in said block; the extreme value detected by the first detecting means being the maximum of said values, and that detected by the second detecting means being the minimum; means for generating dynamic range information (4) of the block from said maximum and minimum values: means (45) for forming the difference between one of said extreme values from each of the digital video data to generate modified digital video data: means for generating a distribution table (5) of said dynamic range information during a predetermined period; means for determining an encoding bit number for each block during said predetermined period from said distribution table and a capacity of data transmission means; encoding means (7) for encoding said modified digital video data with the bit number determined by said determining means; and transmitting means for transmitting an output of said encoding means, a first additional code per block formed of at least two of said maximum value, minimum value and a signal based on said dynamic range information, and a second additional code for each said predetermined period.
Claim 3
Dependent Claim
31 words
Apparatus according to claim 1, characterised in that the one of the two extreme values used to form saidmodified digital data is the minimum detected value of the video digital data.
Claim 4
Dependent Claim
53 words
A high efficiency coding apparatus as claimed in claim 1 or 2, wherein said determining means includes calculating means for calculating the total bit number during said predetermined period on the basis of said distribution table and comparator means for comparing the total bit number with said capacity of said data transmission means.
Claim 5
Dependent Claim
50 words
A high efficiency coding apparatus as claimed in claim 1, 2 or 3 wherein said generating means includes first generating means for generating a first distribution table of said dynamic range information and second generating means for generating a second distribution table of integrating type from said first distribution table.
Claim 6
Dependent Claim
38 words
A high efficiency coding apparatus as claimed in any one of claims 1-4 wherein said calculating means includes setting means for setting a threshold value of the dynamic range information for determining the boundary of plural bit numbers.
Claim 7
Dependent Claim
37 words
A high efficiency coding apparatus as claimed in any one of the preceding claims wherein said determining means includes means responsive to said comparator means for controlling said setting means so that said threshold value is changed.
Claim 8
Dependent Claim
42 words
A high efficiency coding apparatus as claimed in any one of the preceding claims wherein said generating means includes a random access memory addressed by said dynamic range information and an address controller for controlling an address of said random access memory.