Identification of logos from document images
US6327388A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 1998 |
| Grant date | Dec 4, 2001 |
| Priority date | — |
| Expiry date | Aug 14, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F16/5854
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The method and apparatus enables any user to search for logos in document images stored in a bitmap format. The search efficiently compares bitmap or image data by extracting a series of connected components. These connected components are grouped according to region where each region may be a potential logo. Shape and density parameters of a region are determined and compared to the parameters of the stored logo image. If a region is successfully matched then that region is aligned and scaled to the corresponding stored logo image. Thereafter, a bitwise comparison is then performed between the scaled and aligned region and the logo image. A match score is assigned to each region along with other pertinent information about the region, and is stored in a ranked logo list database. The ranked logo list database represents a list of logos found in the document image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.