Method for compressing dynamic image information and system and device therefor
US6084913A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 31, 1997 |
| Grant date | Jul 4, 2000 |
| Priority date | — |
| Expiry date | Oct 31, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/176
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and system for compressing dynamic image information includes a divider which divides each frame of dynamic image data of 16 frames into 4.times.4 pixel blocks that are non-overlapping. A first zigzag scanner arranges each of the blocks in the order of the frames to form a 16.times.16 block. A two-dimensional orthogonal transformer subjects the 16.times.16 block to a two-dimensional DCT to encode the units of the block in a frequency band. A quantizer multiplies the 16.times.16 data by quantization coefficients to approximate the value of the data at discrete levels. A second scanner stores the quantized DCT data as a one-dimensional array from low to high frequency components. A variable length encoder then encodes the scanned data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.