USRE41567EExpiredUtility

Method for optimizing the best resolution of an optical scanning system and apparatus for the same

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Assignee: TSAI JENN-TSAIRPriority: Aug 10, 2000Filed: Apr 10, 2007Granted: Aug 24, 2010
Est. expiryAug 10, 2020(expired)· nominal 20-yr term from priority
Inventors:Jenn-Tsair TsaiJune-Num Chen
H04N 1/00002H04N 1/00013H04N 1/00031H04N 1/00045H04N 1/00053H04N 1/00063H04N 1/00068H04N 1/00076
47
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Cited by
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References
27
Claims

Abstract

The present invention provides a method and an apparatus for fast finding the best resolution of an optical scanning device during assembling steps. The present invention improves the graphics of the calibration device. Accompanying with calculation of an adjustment device, the present invention generates a referencing parameters. The parameters represent the resolution of the optical scanning device; and further is able to show the balance of horizontal resolution and the balance of vertical resolution. In this case, technicians can optimize the best position of the lens in order to build an optical scanning with precision and narrow the misalignment during assembly.

Claims

exact text as granted — not AI-modified
1. A method for optimizing the best  resolution of an optical scanning device, said method employed in assembling processes for enabling an assembling technician to find the best  an acceptable resolution, said optical scanning device including at least an image capturing device, a lens and a document glass, with support of a calibration device and an adjusting device, said method comprising the steps of :
 ( 1 )  fixing said image capturing device and said document glass in a predetermined position, said lens is movable between said image capturing device and said document glass;  
 ( 2 )  placing said calibration device on said document glass and connecting said adjusting device to said image capturing device;  
 ( 3 )  reading values of a right side horizontal MTF, a right side vertical MTF, a left side horizontal MTF and a left side vertical MTF from said adjusting device;  
 ( 4 )  calculating the values of said right side horizontal MTF, said right side vertical MTF, said left side horizontal MTF and said left side vertical MTF to generate a referencing parameter, wherein said referencing parameter is displayed in order to inform said assembling technician ; and  
 ( 5 ) adjusting the position of said lens, when the value of said referencing parameter achieving a relative big value, fixing said lens, 
 wherein said referencing parameter corresponds to a position of the lens and is the sum of the values of said right side horizontal MTF, said right side vertical MTF, said left side horizontal MTF and said left side vertical MTF.  
 
     
     
       2. The method of  claim 1 , wherein the step( 4 )  of generating,  said referencing parameter is the difference between a value of a balance MTF and the sum of the values of said right side horizontal MTF, said right side vertical MTF, said left side horizontal MTF and said left side vertical MTF. 
     
     
       3. The method of  claim 2 , wherein the value of said balance MTF is the sum of the absolute value of left side horizontal MTF minus the right side horizontal  1   MTF and the absolute value of left side vertical MTF minus the right side vertical MTF. 
     
     
       4. The method of  claim 2 , wherein the value of said balance MTF is the sum of the absolute value of left side horizontal MTF minus the right side vertical MTF and the absolute value of left side vertical MTF minus the right side horizontal MTF. 
     
     
       5. The method of  claim 2 , wherein the value of said balance MTF is the sum of the absolute value of left side horizontal MTF minus the right side horizontal  1   MTF, the absolute value of left side vertical MTF minus the right side vertical MTF, the absolute value of left side horizontal MTF minus the right side vertical MTF and the absolute value of left side vertical MTF minus the right side horizontal MTF. 
     
     
       6. The method of  claim 1 , wherein the step( 4 ) of displaying, said adjusting device  further comprising a display for display  displaying said referencing parameter. 
     
     
       7. The method of  claim 6 , wherein said display is a digital type display for displaying said referencing parameter. 
     
     
       8. The method of  claim 6 , wherein said display is a light indicating type display for displaying said referencing parameter. 
     
     
       9. The method of  claim 1 , wherein said image capturing device is a charged-coupled device. 
     
     
       10. A method for adjusting a resolution of an optical scanning device, the method comprising:
   generating values of a right side horizontal Modulation Transfer Function  ( MTF ) , a right side vertical MTF, a left side horizontal MTF and a left side vertical MTF with an adjusting device; and        generating a referencing parameter comprising a sum of the values of the right side horizontal MTF, the right side vertical MTF, the left side horizontal MTF, and the left side vertical MTF with the adjusting device;        wherein the referencing parameter corresponds to a position of a lens of the optical scanning device.     
     
     
       11. The method of  claim 10 , further comprising:
   calculating a value of a balance MTF; and        adjusting the reference parameter according to the value of the balance MTF.     
     
     
       12. The method of  claim 11 , wherein calculating the value of the balance MTF comprises calculating a sum of an absolute value of a difference between the values of the left side horizontal MTF and the right side horizontal MTF and an absolute value of a difference between the values of the left side vertical MTF and the right side vertical MTF. 
     
     
       13. The method of  claim 11 , wherein calculating the value of the balance MTF comprises calculating a sum of an absolute value of a difference between the values of the left side horizontal MTF and the right side vertical MTF and an absolute value of a difference between the values of the left side vertical MTF and the right side horizontal MTF. 
     
     
       14. The method of  claim 11 , wherein calculating the value of the balance MTF comprises calculating a sum of an absolute value of a difference between the values of the left side horizontal MTF and the right side horizontal MTF, an absolute value of a difference between the values of the left side vertical MTF and the right side vertical MTF, an absolute value of a difference between the values of the left side horizontal MTF and the right side vertical MTF, and an absolute value of a difference between the values of the left side vertical MTF and the right side horizontal MTF. 
     
     
       15. The method of  claim 11 , wherein adjusting the reference parameter comprises calculating a difference between the values of the balance MTF and the reference parameter. 
     
     
       16. An apparatus for changing a resolution of an optical scanning device, the apparatus comprising:
   a calibration device comprising a plurality of images, wherein the calibration device is configured to be positioned on a document glass of the optical scanning device; and        an adjusting device configured to      receive image signals from an image capturing device of the optical scanning device, wherein the image signals are generated from the plurality of images of the calibration device,        generate values of a right side horizontal Modulation Transfer Function  ( MTF ) , a right side vertical MTF, a left side horizontal MTF and a left side vertical MTF from the image signals, and        generate a referencing parameter comprising a sum of the values of the right side horizontal MTF, the right side vertical MTF, the left side horizontal MTF, and the left side vertical MTF,        wherein the referencing parameter corresponds to a position of a lens of the optical scanning device.       
     
     
       17. The apparatus of  claim 16 , wherein the adjusting device is further configured to:
   calculate a value of a balance MTF; and        adjust the reference parameter according to the value of the balance MTF.     
     
     
       18. The apparatus of  claim 17 , wherein the value of the balance MTF comprises a sum of an absolute value of a difference between the values of the left side horizontal MTF and the right side horizontal MTF and an absolute value of a difference between the values of the left side vertical MTF and the right side vertical MTF. 
     
     
       19. The apparatus of  claim 17 , wherein the value of the balance MTF comprises a sum of an absolute value of a difference between the values of the left side horizontal MTF and the right side vertical MTF and an absolute value of a difference between the values of the left side vertical MTF and the right side horizontal MTF. 
     
     
       20. The apparatus of  claim 17 , wherein the value of the balance MTF comprises a sum of an absolute value of a difference between the values of the left side horizontal MTF and the right side horizontal MTF, an absolute value of a difference between the values of the left side vertical MTF and the right side vertical MTF, an absolute value of a difference between the values of the left side horizontal MTF and the right side vertical MTF, and an absolute value of a difference between the values of the left side vertical MTF and the right side horizontal MTF. 
     
     
       21. The apparatus of  claim 17 , wherein the reference parameter comprises a difference between the values of the balance MTF and the reference parameter. 
     
     
       22. An apparatus for adjusting a resolution of an optical scanning device, the apparatus comprising:
   means for receiving image signals from an image capturing device of the optical scanning device;        means for generating values of a right side horizontal Modulation Transfer Function  ( MTF ) , a right side vertical MTF, a left side horizontal MTF and a left side vertical MTF from the image signals; and        means for generating a referencing parameter comprising a sum of the values of the right side horizontal MTF, the right side vertical MTF, the left side horizontal MTF, and the left side vertical MTF;        wherein the referencing parameter corresponds to a position of a lens of the optical scanning device.     
     
     
       23. The apparatus of  claim 22 , further comprising:
   means for calculating a value of a balance MTF; and        means for adjusting the reference parameter according to the value of the balance MTF.     
     
     
       24. The apparatus of  claim 23 , wherein the value of the balance MTF comprises a sum of an absolute value of the left side horizontal MTF minus the right side horizontal MTF and an absolute value of the left side vertical MTF minus the right side vertical MTF. 
     
     
       25. The apparatus of  claim 23 , wherein the value of the balance MTF comprises a sum of an absolute value of the left side horizontal MTF minus the right side vertical MTF and an absolute value of the left side vertical MTF minus the right side horizontal MTF. 
     
     
       26. The apparatus of  claim 23 , wherein the value of the balance MTF comprises a sum of an absolute value of the left side horizontal MTF minus the right side horizontal MTF, an absolute value of the left side vertical MTF minus the right side vertical MTF, an absolute value of the left side horizontal MTF minus the right side vertical MTF, and an absolute value of the left side vertical MTF minus the right side horizontal MTF. 
     
     
       27. The apparatus of  claim 23 , further comprising means for calculating a difference between the balance MTF and the reference parameter.

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