| 摘要 |
Information in the form of a two-dimensional bar code is transmitted to and displayed on the screen of, an electronic communications device such as a mobile phone or PDA. This information may be an electronic ticket, give access to an outlet for the transfer of money, represent a promotional voucher or be associated with an interactive television ticketing system. The two dimensional bar code pattern 1 is in the form of a matrix of rows and columns of data cells of either a first or second colour representing encoded data bits, and contains at least one locating symbol 12 at a predetermined position within the bar code pattern. The bar code pattern is detected by analysing a received image to identify potential occurrences of a locating symbol(s) within the image, validating the potential occurrences of locating symbols to identify a locating symbol(s) within the image, and identifying the location of the bar code pattern within the image on the basis of the position(s) of the identified locating symbol(s). The bar code pattern may include check cells 16,17,18 in the form of column parity check cells 16, row parity check cells 17 and data region 14 sum check cells 18. |
