Fast decoding method and device for two-dimension code

The invention provides a fast decoding method and device for a two-dimension code. A video image is firstly scanned at a first preset scanning density to determine the area of the two-dimension code, and then the video image in the area of the two-dimension code is scanned at a second preset scanning density and decoded. Only the area of the two-dimension code is determined in first-time scanning, the scanning speed is high, the scanning time is short, only the area of the two-dimension code is scanned and decoded in second-time scanning, the scanning and decoding area is small, therefore, the processing burden of the fast decoding device for the two-dimension code is reduced, the positioning and decoding time of the two-dimension code is shortened, and the decoding efficiency of the two-dimension code is improved.