Coding apparatus that temporally interpolates block data and selects transmission mode

• US 5,068,726 A
• Filed: 11/26/1990
• Issued: 11/26/1991
• Est. Priority Date: 11/28/1989
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Takahashi, Kenji, Kondo, Tetsujiro
• Primary Examiner(s): Kostak, Victor R.
• Application Number:
  US07/617,806
• Time in Patent Office: 365 Days
• Field of Search: 358/135, 358/136, 358/138, 358/133
• US Class Current: 375/240.14
• CPC Class Codes: H04N 19/98 Adaptive-dynamic-range coding [ADRC]

Abstract

A highly efficient coding apparatus comprises a, circuit (2) for block-segmenting picture element data in areas belonging to each of continuous n (n≧2) frames of digital picture signals, switching circuit (9) for switching in a block unit, a first mode where all picture element data in the n frames of each block is transmitted and a second mode where picture element data in m frames of the n frames is transmitted, a circuit (12, 13 and 14) for detecting, in the second mode, a difference between an interpolation value which interpolates non-transmission data of an objective block from at least picture element data of the objective block to be transmitted and a real value of the non-transmission data, a control signal generating circuit (17) for generating a control signal for the switching circuit (9) on the objective block based on an output of the detecting circuit (12, 13 and a 14), and circuit (10) for transmitting transmission data of an output of the switching circuit (17) and the control signal SJ.

Claims

1. A highly efficient 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 belonging to a plurality of fields and allowing compression of the video data,

interpolating means for interpolating digital video data in one of said plurality of fields of one block from digital video data in another of said plurality of fields of said block and for generating interpolated digital video data,

detecting means for detecting a difference between said interpolated digital video data and real digital video data,

control signal generating means for generating a control signal for said block in response to the output of said detecting means,

encoding means for encoding digital video data in said block belonging to all of said plurality of fields in a first mode and for encoding digital video data in said block belonging to the other of said plurality of fields in a second mode,

selecting means for selecting one of said first and second modes in response to said control signal, and

transmitting means for transmitting the output of said encoding means and said control signal for each said block.

2. A highly efficient coding apparatus according to claim 1, wherein said interpolating means interpolates digital video data from digital video data of said block and digital video data of a block spatially corresponding to said block and temporarily preceding or succeeding said block.

3. A highly efficient coding apparatus according to claim 1, wherein said control signal generating means includes means for accumulating the output of said detecting means for said block and comparator means for comparing the output of said accumulating means with a reference signal.

4. A highly efficient coding apparatus according to claim 1, further comprising sub-sampling means for sub-sampling picture elements in predetermined position in each of said blocks of digital video data to reduce the number of picture elements in each of said block to 1/n of the original number of the picture elements in each of said blocks,

calculating means for calculating the difference between the thinned out data and interpolated data according to a plurality of interpolating methods using transmitted digital video data of picture elements spatially and temporally adjacent to the picture element corresponding to said thinned out data, and

selecting means for selecting one of said plurality of interpolating methods in response to the output of said calculating means and for generating flag data for each block, said flag data being transmitted by said transmitting means.