Encoding system for data transmission

Claim 2

A high efficiency coding apparatus for coding digital video data in a format composed of blocks of digital video data representing a three-dimensional group of picture elements and for allowing compression of the video data, characterised in that it comprises: movement discriminating means (3) for discriminating the presence of a movement in each block to generate a discriminating code (SJ); sub-sampling means (5,6) for sub-sampling each of said blocks of the digital video data to reduce the number of picture elements in each said block to 1/n of the original number of the picture elements, the phases of sub-sampling of n time-sequential blocks by said sub-sampling means being shifted sequentially; and transmitting means (12-19) for transmitting an output of said sub-sampling means (5,6) and said discriminating code (SJ).

Claim 3

Apparatus as claimed in claim 1, wherein said transmitting means(12-19) includes compression encoding means (13,14) for encoding output data of said sub-sampling means (5,6) into compressed data.

Claim 4

Apparatus as claimed in claim 2, wherein said sub-­sampling means (6) includes averaging means (5,6) for averaging digital data of plural video fields and means (4) for sub-sampling an output of said averaging means (4) when said discriminating code (SJ) indicates that no movement exists among said plural video fields.

Claim 5

Apparatus as claimed in claim 3, wherein said compression encoding means (13,14) includes first (13) and second (14) encoding means for two-dimensional and three-­ dimensional blocks, respectively, output data of said sub-­sampling means (5,6) being supplied to said first (13) and second (14) encoding means selectively and controlled by said discriminating code (SJ).

Claim 6

Apparatus as claimed in any one of the preceding claims, wherein said movement discriminating means (3) includes: a first comparator (51)for comparing digital data of a picture element in a first video field and digital data of a corresponding picture element in a second video field; absolute value generating means (52) supplied with an output of said first comparator (51), a second comparator (54a) for comparing an output of said absolute value generating means (52) to generate an absolute value generating means with a reference value; and discriminating means (55) for discriminating an output of said second comparator (54a).

Claim 7

A decoding apparatus for decoding data transmitted by a coding apparatus for coding digital video data in a format composed of blocks of digital video data representing a three-dimensional group of picture elements and for allowing compression of the video data, said coding apparatus having movement discriminating means for discriminating the presence of a movement in each block and generating a discriminating code; sub-sampling means for sub-sampling each said block of digital video data so as to reduce the number of picture elements to 1/n of the original number of the picture elements, the phases of sub-sampling of n time-sequential blocks by said sub-sampling means being shifted sequentially; and transmitting means for transmitting an output of said sub-sampling means and said discriminating code, said decoding apparatus being characterised in that it comprises: discriminating code separating means (22) for separating said discriminating code (SJ) from said sub-sampled data, and adaptive interpolation means (31) for interpolating thinned-out data from actually transmitted data, operation of said interpolation means (31) being controlled by said discriminating code (SJ).

Claim 8

A decoding apparatus for decoding data transmitted by a coding apparatus for coding digital video data in a format composed of blocks of digital video data representing a three-dimensional group of picture elements and for allowing compression of the video data, said coding apparatus having movement discriminating means for discriminating the presence of a movement in each block and generating a discriminating code; sub-sampling means for sub-sampling each said block of digital video data so as to reduce the number of picture elements to 1/n of the original number of the picture elements, the phases of sub-sampling of n time-sequential blocks by said sub-sampling means being shifted sequentially; and transmitting means for transmitting an output of said sub-sampling means and said discriminating code, said decoding apparatus being characterised in that it comprises: discriminating code separating means (22) for separating said discriminating code (SJ) from said sub-sampled data, and adaptive interpolation means (31) for interpolating thinned-out data from actually transmitted data, operation of said interpolation means (31) being controlled by said discriminating code (SJ).

Claim 9

A decoding apparatus as claimed in claim 6, wherein the operation of said interpolation means is controlled by an output of decoding means (34) for decoding n discriminating codes of the n time-sequential blocks.

Claim 10

A decoding apparatus as claimed in claim 7, wherein said interpolation means (31) is arranged to interpolate thinned-­out data by combining data of said n blocks when all discriminating codes indicate that no movement exists in said blocks and said interpolation means interpolates thinned-out data from data in the same video field that said thinned-out data belongs to when the discriminating code of a current block indicates that the movement exists in said current block.

Claim 11

A high efficiency coding apparatus for coding digital video data in a format composed of blocks of digital data representing plural picture elements and for allowing compression of the video data, characterised in that it comprises; sub-sampling means (4,5,6) for sub-sampling said digital video data so as to reduce the number of picture elements to 1/n of the original number of the picture elements; first and second detecting means (fig 15) for detecting maximum and minimum values, respectively, of sub-sampled digital data representing 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 respective blocks; means for generating modified digital video data for each of said blocks as a difference between each of the sub-­sampled digital video data and one of said maximum and minimum values for said respective blocks; means (13,14) for encoding said modified digital video data with a digitized bit number less than the number of bits in the original digital video data so as to provide coded data of a reduced bit length; and transmitting means (15-19) for transmitting the coded data of reduced bit length and an additional code for each of said respective blocks formed of at least two of said maximum and minimum values and a signal corresponding to said dynamic range information.

Claim 12

A high efficiency coding apparatus for coding digital video data in a format composed of blocks of digital data representing plural picture elements and for allowing compression of the video data, characterised in that it comprises; sub-sampling means (4,5,6) for sub-sampling said digital video data so as to reduce the number of picture elements to 1/n of the original number of the picture elements; first and second detecting means (fig 15) for detecting maximum and minimum values, respectively, of sub-sampled digital data representing 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 respective blocks; means for generating modified digital video data for each of said blocks as a difference between each of the sub-­sampled digital video data and one of said maximum and minimum values for said respective blocks; means (13,14) for encoding said modified digital video data with a digitized bit number less than the number of bits in the original digital video data so as to provide coded data of a reduced bit length; and transmitting means (15-19) for transmitting the coded data of reduced bit length and an additional code for each of said respective blocks formed of at least two of said maximum and minimum values and a signal corresponding to said dynamic range information.