Method and apparatus for compensating data image reproduced from holographic system

Abstract

The present invention provides a method and apparatus for preprocessing a page image reproduced from a storage medium in a holographic system. The present invention calculates pixel sums for each lines in the page image to select a maximum sum, calculates a modified maximum sum using the modified maximum sum and its neighboring sums, determines a compensation location for distorted pixels using the modified maximum sum and performs over-sampling a data image with reference to the compensation location of magnified pixels, to thereby compensate the data image with high precision in sub-pixels.

1 - 11 . (canceled) 
   
   
       12 . An apparatus for processing data of a page image detected by a photo-detector in a holographic system, the apparatus comprising:
 a pixel sum calculating block for calculating pixel sums for each lines in the page image;   a maximum sum determining block for selecting a maximum sum among the calculated pixel sums, wherein a pixel location corresponding to the maximum sum corresponds to a border location;   a distortion error calculating block for calculating a distortion error between the border location and a reference border location, the distortion error being calculated by comparing the border location with the reference border location;   a compensation location determining block for determining a compensation location for distorted pixels using the distortion error; and   a pixel over-sampling block for over-sampling pixels in the data image with reference to the compensation location.   
   
   
       13 . A method for processing data of a page image detected by a photo-detector in a holographic system, the method comprising the steps of:
 calculating pixel sums for each lines in the page image;   selecting a maximum sum among the calculated pixel sums, wherein a pixel location corresponding to the maximum sum corresponds to a border location;   calculating a distortion error between the border location and a reference border location, the distortion error being calculated by comparing the border location with the reference border location;   determining a compensation location for distorted pixels using the distortion error; and over-sampling pixels in the data image with reference to the compensation location.