Multiple non-directional scanning

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.

1. A multiple non-directional scanning  method for a scanner,  comprising the steps of :
 capturing a first portion image from a document as the  a chassis moves forward;  
 capturing a second portion image from the document as the chassis moves backward over at least a portion of the document corresponding to the first portion image, wherein the first portion image and the second portion image has  have no overlapping sections; and  
 combining the first portion image and the second portion 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 portion image 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 portion image 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 portion image 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 portion image 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 at least a portion of a document;  by: 
 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  the document as the  a chassis moves forward;    capturing a second portion image from the document as the chassis moves backward over at least a portion of the document corresponding to the first portion image, wherein the first portion image and the second portion image has  have no overlapping sections; and    combining the first portion image and the second portion image to form a final scan image.    
 
     
     
       9. The method of  claim 8 , wherein the step of  further comprising deciding if more scanning is required is  based on the  a scanning state of at least one of the  multiple documents. 
     
     
       10. An apparatus, comprising:
   a scanner configured to capture a first portion image from a document during a scan in a first direction, and to capture a second portion image from the document during a scan in a second direction, wherein the scans in the first and the second directions are performed over at least one common portion of the document, and wherein the first portion image and the second portion image comprise no overlapping sections.     
     
     
       11. The apparatus of  claim 10 , wherein the scanner is further configured to combine the first portion image and the second portion image to form a final scan image. 
     
     
       12. The apparatus of  claim 10 , wherein said capture of the first portion image includes a sample of alternative pixel points from the document as image data. 
     
     
       13. The apparatus of  claim 10 , wherein said capture of the first portion image and the second portion image includes a sample of odd pixel points and even pixel points, respectively. 
     
     
       14. The apparatus of  claim 10 , wherein said capture of the first portion image and the second portion image includes a sample of even pixel points and odd pixel points, respectively. 
     
     
       15. The apparatus of  claim 10 , wherein said capture of the first portion image includes a sample of alternative pixel lines from the document as image data. 
     
     
       16. The apparatus of  claim 15 , wherein said capture of the first portion image and the second portion image includes a sample of odd pixel lines and even pixel lines, respectively. 
     
     
       17. The apparatus of  claim 15 , wherein said capture of the first portion image and the second portion image includes a sample of even pixel lines and odd pixel lines, respectively. 
     
     
       18. A method, comprising:
   capturing a first portion image from a document during a scan in a first direction; and        capturing a second portion image from the document during a scan in a second direction, wherein the scans in the first and the second directions are performed over at least one common portion of the document, and wherein the first portion image and the second portion image comprise no overlapping sections.     
     
     
       19. The method of  claim 18 , wherein said capturing the first portion image includes sampling alternative pixel points from the document as image data. 
     
     
       20. The method of  claim 18 , wherein said capturing the first portion image and the second portion image include sampling odd pixel points and even pixel points, respectively. 
     
     
       21. The method of  claim 18 , wherein said capturing the first portion image and the second portion image include sampling even pixel points and odd pixel points, respectively. 
     
     
       22. The method of  claim 18 , wherein said capturing the first portion image includes sampling alternative pixel lines from the document as image data. 
     
     
       23. The method of  claim 22 , wherein said capturing the first portion image and the second portion image includes sampling odd pixel lines and even pixel lines, respectively. 
     
     
       24. The method of  claim 22 , wherein said capturing the first portion image and the second portion image includes sampling even pixel lines and odd pixel lines, respectively. 
     
     
       25. A method, comprising:
   scanning at least a portion of a document by:      capturing a first portion image from the document during a forward scan over the portion of the document;        capturing a second portion image from the document during a backward scan over the same portion of the document, wherein the first portion image and the second portion image comprise no overlapping sections; and        combining the first portion image and the second portion image to form a final scan image.       
     
     
       26. The method of  claim 25 , further comprising:
   determining to perform additional scanning operations on the document; and        deciding a next scanning of the document is in the forward direction or the backward direction;        scanning at least another portion of the document in the forward direction or the backward direction based on the decision.     
     
     
       27. The method of  claim 26 , wherein said determining to perform additional scanning operations on the document is based on a scanning state of at least one of multiple documents.