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1. (WO2017033275) IMAGE READING APPARATUS, IMAGE READING METHOD, AND IMAGE READING PROGRAM

Pub. No.:    WO/2017/033275    International Application No.:    PCT/JP2015/073813
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Wed Aug 26 01:59:59 CEST 2015
IPC: H04N 1/387
Applicants: HITACHI INFORMATION & TELECOMMUNICATION ENGINEERING, LTD.
株式会社日立情報通信エンジニアリング
Inventors: NEGAMI, Toyohiro
根上 豊弘
SUZUKI, Kazumi
鈴木 和美
Title: IMAGE READING APPARATUS, IMAGE READING METHOD, AND IMAGE READING PROGRAM
Abstract:
Provided is a technique for enabling lossless image data to be acquired even when a document is not in a rectangular shape. An image reading apparatus having a reading unit that reads an image of a document comprises: a skew angle calculation unit that calculates, on the basis of image data of the image read by the reading unit, a skew angle to be used for correcting the inclination of the document; a circumscription area detection unit that generates a first skew-corrected image obtained by rotating the image on the basis of the skew angle and scans the first skew-corrected image generated, thereby detecting a circumscribing quadrangle included in the first skew-corrected image and circumscribing the image of the document; and an image cutting-out unit that cuts out, on the basis of the coordinates of the four corner points of the circumscribing quadrangle, a cut-out document image from the image read by the reading unit.