Duplex scan method of detecting document size

• US 20050259298A1
• Filed: 05/16/2005
• Published: 11/24/2005
• Est. Priority Date: 05/18/2004
• Status: Abandoned Application

• Current Assignee: Avision, Inc.
• Original Assignee: Avision, Inc.
• Inventors: Lien, Szu Hui, Wang, Bo-Hsiang
• Application Number:
  US11/129,372
• Publication Number:
  US 20050259298A1
• Time in Patent Office: Days
• US Class Current: 358/496
• CPC Class Codes: H04N 1/00681 Detecting the presence, position or size of a sheet or correcting its position before scanning H04N1/047 takes precedence; mode signalling H04N1/333; skew detection or correction in image signals H04N1/3878
• CPC Class Codes: H04N 1/0071 Width
• CPC Class Codes: H04N 1/00713 Length
• CPC Class Codes: H04N 1/00718 Skew
• CPC Class Codes: H04N 1/00721 Orientation
• CPC Class Codes: H04N 1/207 Simultaneous scanning of the original picture and the reproduced picture with a common scanning device

Abstract

A duplex scan method of detecting document size includes the steps of: (a) detecting size of a document and generating a size signal while moving the document from a sheet input tray to a reverse region; (b) moving the document across a scan region from the reverse region to the reverse region and scanning a back side of the document at the scan region according to the size signal; and (c) moving the document across the scan region from the reverse region to a sheet output tray and scanning a front side of the document at the scan region according to the size signal.

Claims

1. A duplex scan method of detecting document size comprising the steps of:

(a) detecting size of a document and generating a size signal while moving the document from a sheet input tray to a reverse region;

(b) moving the document across a scan region from the reverse region to the reverse region and scanning a back side of the document at the scan region; and

(c) moving the document across the scan region from the reverse region to a sheet output tray and scanning a front side of the document at the scan region.

2. The method according to claim 1, wherein the size of the document comprises at least one of a length and a width.

3. The method according to claim 1, further comprising the steps of:

processing a back side image obtained after scanning the back side of the document into a back side printing signal and outputting the back side printing signal to a printing device for printing; and

processing a front side image obtained after scanning the front side of the document into a front side printing signal and outputting the front side printing signal to the printing device for printing.

4. The method according to claim 3, further comprising the steps of:

outputting the size signal to the printing device such that the printing device automatically selects a size of a printing medium.

5. The method according to claim 1, further comprising the steps of:

processing a back side image obtained after scanning the back side of the document into a processed back side image and printing the processed back side image on a back side of a sheet; and

processing a front side image obtained after scanning the front side of the document into a processed front side image and printing the processed front side image on a front side of the sheet.

6. The method according to claim 1, further comprising the steps of:

determining a size of a printing medium according to the size signal;

processing a back side image obtained after scanning the back side of the document into a processed back side image and printing the processed back side image on a back side of the printing medium; and

processing a front side image obtained after scanning the front side of the document into a processed front side image and printing the processed front side image on a front side of the printing medium.

7. The method according to claim 1, wherein the back side of the document is scanned according to the size signal.

8. The method according to claim 1, wherein the front side of the document is scanned according to the size signal.