Area determination method, image compression method, image compression apparatus, and recording medium
US8311333B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2009 |
| Grant date | Nov 13, 2012 |
| Priority date | — |
| Expiry date | Sep 7, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/642
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
First, a binary image is generated by binarizing an image. Next, a binary pixel ratio, that is a ratio of a binary pixel quantity that is a quantity of dotted pixels included in a specific area of the binary image to a total quantity of pixels included in the specific area of the binary image, is found. Then, a thin-line image is generated by performing a line-thinning process on the specific area. After that, a thin-line pixel ratio that is a ratio of the quantity of dotted pixels included in the generated thin-line image to the binary pixel quantity is found, and the specific area is determined to be a map area or a photograph area based on the calculated binary pixel ratio and the calculated thin-line pixel ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.