Image compression apparatus
US7184589B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 2003 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Aug 16, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/642
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image compression apparatus has a connected pixel extraction unit for extracting drawn connected pixels contained in the color document image, a foreground/background image classification unit for classifying connected pixel groups extracted by the compressed connected pixel extraction unit as a foreground image or a background image, a color-by-color-based binary image generation unit for generating binary image data for each color from information on the color of the connected pixel groups classified as a foreground image, a foreground image compression unit for compressing the color binary image data generated by the compressed color-by-color-based binary image generation unit, a background image generation unit for generating a background image, a background image compression unit for compressing the background image generated by the compressed background image generation unit, and a compressed image data generation unit for combining the foreground image data compressed by the foreground image compression unit with the background image data compressed by the background image compression unit into a single piece of compression image data.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.