Patent ID: 8006911

Claim:
A method for encoding a large capacity 2-dimensional color bar code that can be color-corrected, comprising the steps of: forming a color correction pattern used for correcting the colors of the 2-dimensional bar code, the color correction pattern having all colors used for the 2-dimensional bar code and being located in a specific region of the bar code; forming a 2-dimensional bar code start pattern for indicating a start point of the 2-dimensional bar code, the 2-dimensional bar code start pattern being composed of a plurality of square pixels, the 2-dimensional bar code start pattern including a one-dimensional pattern in which black and white portions are alternately arranged; forming a 2-dimensional bar code search pattern having black and white stripes having a specific width in a right-angled equilateral triangle having two 2-dimensional bar code start patterns including the one-dimensional pattern as two sides thereof, lengths of X-axis and Y-axis sides of the right-angled equilateral triangle being identical to each other; forming position correcting markers at end points of the X-axis and Y-axis sides of the 2-dimensional bar code search pattern and an intersection of lines respectively extended from the end points, respectively, each position correcting marker being in the form of square and having a predetermined number of pixels in horizontal and vertical directions, each position correcting marker having a black central pixel and white pixels surrounding the black central pixel; and forming at least one meta data between the position correcting markers, the meta data including a ratio of height/width of the 2-dimensional bar code to a quantity of additional data for error correction, the meta data including additional data for correcting an error thereof.