Compact image transmission system and image reproducing device capable of reproducing a DCT-based code at a high speed without deterioration of picture quality
US6094456A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 1998 |
| Grant date | Jul 25, 2000 |
| Priority date | — |
| Expiry date | Aug 7, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/91
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Processing is carried out assuming that a picture structure is fixed to I picture and P picture and that motion compensation value is fixed. header analyzing section 11 identifies the type of picture of input video code. In case of P picture, IDCT section 14 carries out IDCT to calculate a differential value of each block. An adder 15 adds the differential value and a motion compensated block obtained by motion compensating, by forward prediction section 18, a video code of preceding frame stored in a preceding frame section 16. Thus, an image is expanded and reproduced. By fixing the picture structure to I picture and P picture, it is possible to dispense with judgement whether or not the picture is B picture and backward prediction or bidirectional prediction in processing of the B picture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.