Multiple non-directional scanning

• US 6,650,442 B1
• Filed: 07/17/2000
• Issued: 11/18/2003
• Est. Priority Date: 03/06/2000
• Status: Expired

• Current Assignee: Transpacific Systems LLC (Intellectual Ventures LLC)
• Original Assignee: Umax Data Systems Incorporated
• Inventors: Chiu, Hui-Hsien
• Primary Examiner(s): Coles, Edward
• Assistant Examiner(s): Sherrill, Jason
• Application Number:
  US09/618,598
• Time in Patent Office: 1,219 Days
• Field of Search: 358/424, 358/497, 358/486, 358/483, 358/425, 358/445, 250/208.1, 250/234, 382/284, 382/282, 382/294, 382/276, 382/194
• US Class Current: 358/474
• CPC Class Codes: H04N 1/00795 Reading arrangements details of scanning heads H04N1/024; scanning arrangements therefor H04N1/04
• CPC Class Codes: H04N 1/00819 Self-calibrating reading means
• CPC Class Codes: H04N 1/04 Scanning arrangements , i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versaH04N1/387 takes precedence
• CPC Class Codes: H04N 1/1013 with sub-scanning by translatory movement of at least a part of the main-scanning components H04N1/107 takes precedence
• CPC Class Codes: H04N 1/193 using electrically scanned linear arrays , e.g. linear CCD arrays
• CPC Class Codes: H04N 2201/0081 Image reader H04N2201/0091 - H04N2201/0094 take precedence
• CPC Class Codes: H04N 2201/0416 Performing a pre-scan
• CPC Class Codes: H04N 2201/044 Moving a scanning element into cooperation with a calibration element, e.g. a grey-wedge mounted on the document support, or vice versa

Abstract

A multiple non-directional scanning method. A document preview scanning is carried out from one end of the document to the other. The preview image is next analyzed to provide a set of scan parameters. After setting the scan parameters, the scanner performs a backward scanning operation from the other end of the document back to the original start-up position to obtain a final scan image.

Claims

1. A multiple non-directional scanning method for a scanner, comprising the steps of:

capturing a first portion image from a document as the chassis moves forward;

capturing a second portion image from the document as the chassis moves backward, wherein the first portion image and the second portion image has no overlapping sections; and

combining the first and the second image to form a final scan image.

2. The method of claim 1, wherein the step of capturing the first portion image includes sampling alternative pixel points from the document as image data.

3. The method of claim 1, wherein the step of capturing the first and the second portion image includes sampling the odd pixel points and the even pixel points respectively.

4. The method of claim 1, wherein the step of capturing the first and the second portion image includes sampling the even pixel points and the odd pixel points respectively.

5. The method of claim 1, wherein the step of capturing the first portion image includes sampling alternative pixel lines from the document as image data.

6. The method of claim 5, wherein the step of capturing the first and the second portion image includes sampling the odd pixel lines and the even pixel lines respectively.

7. The method of claim 5, wherein the step of capturing the first and the second portion image includes sampling the even pixel lines and the odd pixel lines respectively.

8. A multiple non-directional scanning method for a scanner suitable for the scanning of a portion of each document consecutively, comprising the steps of:

scanning a portion of a document;

deciding if there is anymore scanning operation; and

deciding if the next scanning of document is in the forward or the backward direction when more scanning is needed,

wherein when scanning a portion of the document, scanning steps comprises;

capturing a first portion image from a document as the chassis moves forward;

capturing a second portion image from the document as the chassis moves backward, wherein the first portion image and the second portion image has no overlapping sections; and

combining the first and the second image to form a final scan image.

9. The method of claim 8, wherein the step of deciding if more scanning is required is based on the scanning state of at least one of the documents.