| 摘要 |
PROBLEM TO BE SOLVED: To provide a 2D color barcode with downsized cells.SOLUTION: The barcode includes a 2D array of data cells, four corner locators 12, and border reference cells 13A, 13B forming four borders between the corner locators and substantially surrounding the array of data cells. Each of the data cells and the border reference cells has one of four primary colors (e.g., CMYK). Most of the border reference cells have the same size as the data cells, except for yellow ones which are longer. The border reference cells form a repeating color sequence along the borders, and are used during decoding to calculate a channel offset (spatial offset) of each primary color at different locations along the borders and a reference (average) color value of each primary color. During decoding, the color value of each data cell is measured while taking into account the channel offset, which is calculated by interpolating channel offsets of the border reference cells. |
