Image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface and a method for executing the same
US6014470A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 25, 1997 |
| Grant date | Jan 11, 2000 |
| Priority date | — |
| Expiry date | Jun 25, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04794
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An image reading apparatus having a function for rectifying an image distortion caused by a curvature of a document surface, wherein the image distortion is rectified by duplicating image data that is a line of pixels in accordance with a varied amount of heights of a document surface, and a data conversion that is a image processing procedure in which the number of bits for pixels is reduced, is executed for the rectified image data. Data conversion elements whose number is the same as the maximum duplicated number "N", are arranged in a data conversion device, and the image data of a line to be duplicated arc input to the data conversion elements whose number is the same as duplicated number "n" of the line (n.ltoreq.N), and then, n-line image data which is processed in n data conversion elements, are stored in a memory. Thereby, reducing a memory capacity needed for the distortion rectification can be achieved without lowering picture quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.