Compensation apparatus for image scan

Abstract

A compensation apparatus for image scan, applied to an optical scanner with a platform, on which an object to be scanned is disposed. The optical scanner has a photosensitive apparatus with a set of scan photosensitive devices and a storage apparatus. When the object is scanned by the set of scan photosensitive devices, a scanned image is obtained and saved in the storage apparatus temporarily. The compensation apparatus has a set of calibration boards, a set of calibration photosensitive devices and an image processor. The set of calibration boards has two calibration boards located at two sides of the platform. The set of calibration photosensitive devices is located at two sides of the set of scan photosensitive device. The image processor is used to extract and compare the calibrated image, so as to adjust the scanned image.

1 - 22 . (canceled)  
     
     
         23 . A compensation apparatus comprising: 
 one or more calibration boards, approximately located at one side of a platform;    a set of calibration photosensitive devices, approximately located at one side of a set of scan photosensitive devices, capable of obtaining a calibrated image by detecting the one or more calibration boards calibration board; and    an image processor, capable of calculating an optical path deviation based at least in part on the calibrated image to adjust the scanned image.    
     
     
         24 . The compensation apparatus according to claim  22 , 
 wherein the one or more calibration boards comprise two calibration boards approximately located at two sides of the platform; and    wherein the set of calibration photosensitive devices are approximately located at two sides of the set of scan photosensitive devices.    
     
     
         25 . A method, comprising: 
 obtaining a calibrated image by detecting one or more calibration boards approximately located at one side of a platform of a scanner with a set of calibration photosensitive devices; and    calculating an optical path deviation based at least in part on the calibrated image to adjust the scanned image.    
     
     
         26 . The method according to  claim 25 , further comprising obtaining a calibrated image by detecting two calibration boards approximately located at two sides of the platform.  
     
     
         27 . The method according to  claim 26 , wherein said calculating comprises extracting and comparing the calibrated image to calculate said optical path deviation magnitude and direction based at least in part on a pattern proportion and a displacement of the calibrated image of the calibration board detected by the set of calibration photosensitive devices.  
     
     
         28 . An apparatus, comprising: 
 means for obtaining a calibrated image by detecting a calibration board approximately located at one side of a platform of a scanner with a set of calibration photosensitive devices; and    means for calculating an optical path deviation based at least in part on the calibrated image to adjust the scanned image.    
     
     
         29 . The apparatus according to  claim 28 , wherein said means for obtaining a calibrated image comprises means for obtaining a calibrated image by detecting two calibration boards approximately located at two sides of the platform.  
     
     
         30 . The apparatus according to  claim 29 , wherein said means for calculating comprises means for extracting and comparing the calibrated image to calculate said optical path deviation magnitude and direction based at least in part on a pattern proportion and a displacement of the calibrated image of the calibration board detected by the set of calibration photosensitive devices.  
     
     
         31 . An article comprising: a storage medium having stored thereon instructions, that, if executed, result in: 
 obtaining a calibrated image by detecting one or more calibration boards approximately located at one side of a platform of a scanner with a set of calibration photosensitive devices; and    calculating an optical path deviation based at least in part on the calibrated image to adjust the scanned image.    
     
     
         32 . The article of  claim 31 , wherein the instructions, if executed, further result in obtaining a calibrated image by detecting two calibration boards approximately located at two sides of the platform.  
     
     
         33 . The article of  claim 32 , wherein said calculating comprises extracting and comparing the calibrated image to calculate said optical path deviation magnitude and direction based at least in part on a pattern proportion and a displacement of the calibrated image of the calibration board detected by the set of calibration photosensitive devices.  
     
     
         34 . A scanner comprising: 
 a platform;    one or more calibration boards, approximately located at one side of the platform;    an optical system comprising one or more mirrors, a lens, and a set of calibration photosensitive devices;    wherein the set of calibration photosensitive devices are approximately located at one side of a set of scan photosensitive devices, and wherein the set of calibration photosensitive device are capable of obtaining a calibrated image by detecting the one or more calibration boards calibration board; and    an image processor, capable of calculating an optical path deviation based at least in part on the calibrated image to adjust the scanned image.    
     
     
         35 . The scanner according to  claim 34 , 
 wherein the one or more calibration boards comprise two calibration boards approximately located at two sides of the platform; and    wherein the set of calibration photosensitive devices are approximately located at two sides of the set of scan photosensitive devices.    
     
     
         36 . The scanner according to  claim 35 , wherein the image processor is capable of extracting and comparing the calibrated images to calculate said optical path deviation magnitude and direction based at least in part on a pattern proportion and a_displacement of the calibrated images of the calibration boards detected by the set of calibration photosensitive devices.