Two-dimensional code, corresponding coding and decoding method and code spraying and reading device

The invention relates to a two-dimensional code for livestock and poultry carcass skin code spraying, a corresponding coding and decoding method, and a code spraying and code reading device, a matrix graph of the two-dimensional code is composed of 33 * 33 modules, the content of the two-dimensional code is composed of a position detection graph composed of three 7 * 7 modules, a data coding area and a user-defined area, and the position detection graph conforms to the version 4, 4 ', 5', 6 ', 7', 7 ', 7', 7 'and 7' of the QRCode standard. And a single code point of the data coding area occupies a 2 * 2 module. The two-dimensional graphic code has the advantages of few code points, diffusion prevention, simplicity in coding, capability of customizing characters or pictures, high recognition rate, easiness in information expansion and the like. 一种用于畜禽胴体表皮喷码的二维码、相应的编码及解码方法、喷码及读码装置，所述二维码的矩阵图形由33×33模块组成，所述二维码的内容由3个7×7模块组成的位置探测图形、数据编码区和自定义区域组成，所述位置探测图形符合QRCode标准的版本4，所述数据编码区单个码点占据2×2模块。采用本发明的二维图形码具备码点少、防扩散、编码简单、可自定