Ordering and formatting coded image data and reconstructing partial images from the data
US5339108A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1992 |
| Grant date | Aug 16, 1994 |
| Priority date | — |
| Expiry date | Jun 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/60
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Editing of information recovered from a relatively high speed communications medium such as a communications channel or magnetic tape often times allows only a portion of the information to be recovered. Storing information in complete segments from which portions of an image, called "snatches," may be recovered helps. An image signal is compressed in such a way that a snatch can be used during decompression to reconstruct a recognizable image from less than all the information that defines the image-thereby giving rise to the notion of a partially reconstructed image. The image information comprises several pixel data blocks with each block including sufficient pixel image data to reconstruct a portion of the image. The pixel data blocks are discrete cosine transformed ("dct") to generate a set of dct coefficient blocks. The dct coefficients for a group of dct coefficient blocks are rank ordered from highest visibility coefficient (corresponding to lowest dct frequency coefficient) to lowest visibility coefficient (corresponding to highest dct frequency coefficient), and then are quantized, entropy encoded, and formatted together with synchronization information and parity checks …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.