Decoding apparatus

Claim 2

A decoding apparatus for decoding data transmitted from coding apparatus comprising: means for generating adjacent sample data of a sample datum to be decoded; comparator means for comparing the datum corresponding to the datum to be decoded and the data corresponding to said adjacent sample data; correcting data generating means supplied with the output of said comparator means and for generating a correcting datum; and decoding means for decoding an original datum from said sample datum to be decoded and said correcting datum.

Claim 3

A decoding apparatus according to claim 1, wherein said coding apparatus coding the original datum with the less number of bits than that of said original datum.

Claim 4

A decoding apparatus according to claim 1, wherein said data includes digitized video data and said adjacent sample data generating means includes line delay means for delaying a datum for one line period and sample delay means for delaying a datum for one sample period.

Claim 5

A decoding apparatus according to claim 2, wherein said coding apparatus encodes digital video data in a block format allowing compression of the block data representing a group of picture elements and includes first detecting means for detecting a maximum value of the digital video data of said picture elements in each block, second detecting means for detecting a minimum value of digital video data of said picture elements in said block, means for generating dynamic range information of the block from said maximum and minimum values, means for generating modified digital video data for each of said block as a difference between each of said digital video data and one of said maximum and minimum values for respective blocks, encoding means for encoding said modified digital video data using the number of bits less than the number of bits in the original datum, and transmitting means for transmitting the encoded data and an additional code for each of said respective blocks, said additional code being formed of at least two of said maximum value, minimum value, and a signal corresponding said dynamic range information.

Claim 6

A decoding apparatus according to claim 4, wherein said adjacent sample data generating means generates adjacent sample data in a same block to which said sample datum to be decoded belongs and said decoding means includes adder means for adding said correcting datum and said sample datum to be decoded, a decoder for decoding the output of said adder means adaptive to said dynamic range information, and mixing means for mixing the output of said decoder and one of said maximum and minimum values.

Claim 7

A decoding apparatus according to claim 4, further comprising a dynamic range adaptive decoder for decoding transmitted data to be adaptive to said dynamic range information, and block separation means.

Claim 8

A decoding apparatus according to claim 6, wherein said adjacent sample data generating means is supplied with the output of said block separation means, and said decoding means includes an adder for adding the output of said block separation means and said correcting datum.

Claim 9

A decoding apparatus according to claim 7, wherein said comparator means compares added data of the decoded sample datum and a half of a quantized step and the decoded output of said adjacent sample data.

Claim 10

A decoding apparatus according to claim 2, wherein said coding apparatus encodes the original sample datum with first bit number and second bit number in a alternate and cyclical fashion.