Patent ID: 8811716
Filing Date: 2014-08-19
Classification: G11B

Abstract:
1. A method to determine a fiducial point for holographic data storage, comprising steps: receiving a gray-level image; using a first reference gray-level frame to sequentially retrieve from said gray-level image regional images each having a same size as said first reference gray-level frame to function as first retrieved images, comparing said first reference gray-level frame with each said first retrieved image to obtain a plurality of first values, and using said first values to construct a first 2D proto-matrix; transforming said first 2D proto-matrix into a first 2D matrix via letting said first values which are smaller than 0 be 0 and keeping unchanged said first values equal to or greater than 0; using said first 2D matrix and a retrieving matrix, which has a dimensionality equal to or smaller than that of said first reference gray-level frame, to obtain a first anchor matrix, and finding a greatest said first value in a central region of said first 2D matrix to function as a first anchor value according to said first anchor matrix; and using said first anchor value to find a first position corresponding to said first anchor value in said gray-level image, and using said first position as a position of a first fiducial point, wherein said gray-level image has a grayscale depth of N bits, and wherein said first value is denoted by V1 and obtained according to an equation: wherein x is said gray-level image and yI is said first retrieved image, wherein 0<C wherein μ wherein σ wherein σ wherein and wherein said gray-level image has a plurality of blocks, and wherein each said block contains n×n pieces of pixels, and wherein n is a natural number, and wherein retrieving said first retrieved images starts from a first row and a first column of said blocks and advances toward a last row and a last column sequentially pixel by pixel.