Patent ID: 7656564

Claim:
A method of using a pixel compensation apparatus to compensate for pixel distortion while reproducing hologram data, which is recorded in a storage medium as an interference pattern that is obtained through interference of reference light with signal light that is modulated in accordance with the data, the method comprising the steps of: reading an image frame from said storage medium to obtain a reproduced image frame; said pixel compensation apparatus extracting a reproduced data image from said reproduced image frame including the reproduced data image and borders; said pixel compensation apparatus determining position values of edges of the extracted reproduced data image; said pixel compensation apparatus determining position values of start and end point pixels of line data based on the determined position values of the edges; said pixel compensation apparatus calculating average magnification error values of pixels within the line data based on the determined position values of the start and end point pixels, wherein the average magnification error values represent a ratio of a difference between a size of the extracted reproduced data image and an actual data size to the actual data size; and said pixel compensation apparatus compensating for pixel positions in the extracted reproduced data image using predetermined misalignment compensation values for the pixels that correspond to the calculated average magnification error values, wherein the calculated average magnification error values include an x-directional average magnification error value and an y-directional average magnification error value, wherein the step of calculating the average magnification error values includes the steps of: calculating an x-directional magnification error value X mag error and a y-directional magnification error value Y mag error using the following Equations; and X mag error=( x 2− x 1)− X data size Y mag error=( y 3− y 1)− Y data size calculating the degree of x-directional misalignment per pixel x and the degree of y-directional misalignment per pixel y using the following Equations, x=X mag error/ X data size y=Y mag error/ Y data size, and wherein X data size is an actual data size in the x direction, x1 is the position value of the start point pixel in the x direction, x2 is the position value of the end point pixel in the x direction, Y data size is an actual data size in the y direction, y1 is the position value of the start point pixel in the y direction, and y3 is the position value of the end point pixel in the y direction.