Block decoding method and system for two-dimensional code

A block decoding method for a two-dimensional code, characterized by comprising:

• storing a received two-dimensional code image in an image data backup register;
• binarizing the received two-dimensional code image based on a gray-scale value of a pixel;
• searching for a boundary line of the two-dimensional code image based on a position detection pattern;
• searching for a version number of the two-dimensional code image;
• segmenting the two-dimensional code image into regions based on the boundary line of the two-dimensional code image and a straight line where a boundary line of the position detection pattern is located;
• calculating the number of bits in each of the regions based on the position detection pattern and the version number;
• segmenting each of the regions into bit regions each of which corresponds to one bit data, based on deformation amount of the position detection pattern;
• re-acquiring the received two-dimensional code image stored in the image data backup register;
• calculating an average gray-scale value of all the pixels in the bit region as a gray-scale value of the bit region;
• calculating a gray-scale threshold of each of the bit regions based on the gray-scale value of the bit region using the Otsu method;
• binarizing the bit region based on the gray-scale threshold so as to obtain a binarized two-dimensional code image;
• and
• decoding the binarized two-dimensional code image.

A block decoding system for a two-dimensional code, characterized by comprising:

• a storage module which is configured for storing a received two-dimensional code image in an image data backup register;
• a first binarizing module which is configured for binarizing the received two-dimensional code image based on a gray-scale value of a pixel;
• a first searching module which is configured for searching for a boundary line of the two-dimensional code image based on a position detection pattern;
• a second searching module which is configured for searching for a version number and a correction pattern of the two-dimensional code image;
• a first segmenting module which is configured for segmenting the two-dimensional code image into regions based on the boundary line of the two-dimensional code image, a straight line where a boundary line of the position detection pattern is located and a straight line where a boundary line of the correction pattern is located;
• a first calculating module which is configured for calculating the number of bits in each of the regions based on the position detection pattern, the correction pattern and the version number;
• a second segmenting module which is configured for segmenting each of the regions into bit regions each of which corresponds to one bit data, based on deformation amount of the position detection pattern and deformation amount of the correction pattern;
• an acquiring module which is configured for re-acquiring the received two-dimensional code image stored in the image data backup register;
• a second calculating module which is configured for calculating an average gray-scale value of all the pixels in the bit region as a gray-scale value of the bit region;
• a third calculating module which is configured for calculating a gray-scale threshold of each of the bit regions based on the gray-scale value of the bit region using the Otsu method;
• a second binarizing module which is configured for binarizing the bit region based on the gray-scale threshold so as to obtain a binarized two-dimensional code image;
• and
• a decoding module which is configured for decoding the binarized two-dimensional code image.

A block decoding system for a two-dimensional code, characterized by comprising

• a storage module which is configured for storing a received two-dimensional code image in an image data backup register;
• a first binarizing module which is configured for binarizing the received two-dimensional code image based on a gray-scale value of a pixel;
• a first searching module which is configured for searching for a boundary line of the two-dimensional code image based on a position detection pattern;
• a second searching module which is configured for searching for a version number of the two-dimensional code image;
• a first segmenting module which is configured for segmenting the two-dimensional code image into regions based on the boundary line of the two-dimensional code image and a straight line where a boundary line of the position detection pattern is located;
• a first calculating module which is configured for calculating the number of bits in each of the regions based on the position detection pattern and the version number;
• a second segmenting module which is configured for segmenting each of the regions into bit regions each of which corresponds to one bit data, based on deformation amount of the position detection pattern;
• an acquiring module which is configured for re-acquiring the received two-dimensional code image stored in the image data backup register;
• a second calculating module which is configured for calculating an average gray-scale value of all the pixels in the bit region as a gray-scale value of the bit region;
• a third calculating module which is configured for calculating a gray-scale threshold of each of the bit regions based on the gray-scale value of the bit region using the Otsu method;
• a second binarizing module which is configured for binarizing the bit region based on the gray-scale threshold so as to obtain a binarized two-dimensional code image;
• and
• a decoding module which is configured for decoding the binarized two-dimensional code image.