Encoded color halftone micro-dots for high density digital information storage
First Claim
1. A machine readable data structure comprising:
- a two-dimensional data block with multiple rows and multiple columns of printed color data cells used for large amount of digital data storage, each said color data cell being coded with multiple-bit digital binary data, a plurality of said horizontal neighboring color data cells representing a digital byte, each said row within the data block containing data cells and check cells, each said column within the data block containing data cells and check cells; and
a boarder-cell ring enclosing said two-dimensional data block; and
wherein each said color data cell represents a multiple-bit digital binary data and the colors selected to represent multiple-bit digital binary data meeting the requirement of maximum noise immunity on reading in red, green, and blue color spaces.
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Abstract
Apparatus and method for storing large amount of digital data into the color halftone micro-dots generated by high resolution color laser or ink jet printers or lithography on a substrate, such as paper. A data cell composed of color halftone micro-dots is encoded with multi-bit digital binary data. The size of the data cell is determined by the resolution of the color printer and the color scanner, the density of the cyan, yellow, magenta and black inks and the reflectance of the red, green and blue lights, in order to meet the requirement of decoding the multi-bit binary data with enough noise immunity. Collections of data cells in a two-dimensional matrix forms a data block. The data block is enclosed with an exterior data cell border with pre-determined data pattern and is used to determine the spacing of the data cell, the orientation of the data block and reflectance of the data cells during scanning and data reconstruction. A parity bit for each digital byte and extensive two-dimensional error detection and correction scheme for the data block are implemented. With the utilization of 600 dot per inch high resolution color printers and scanners, a data cell of 10 mil by 10 mil size and encoded with 3-bits binary data equivalent to 3,000 bytes of digital data stored in a 1 inch square paper.
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Citations
9 Claims
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1. A machine readable data structure comprising:
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a two-dimensional data block with multiple rows and multiple columns of printed color data cells used for large amount of digital data storage, each said color data cell being coded with multiple-bit digital binary data, a plurality of said horizontal neighboring color data cells representing a digital byte, each said row within the data block containing data cells and check cells, each said column within the data block containing data cells and check cells; and
a boarder-cell ring enclosing said two-dimensional data block; andwherein each said color data cell represents a multiple-bit digital binary data and the colors selected to represent multiple-bit digital binary data meeting the requirement of maximum noise immunity on reading in red, green, and blue color spaces. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification