Two-dimensional bar code initial positioning method

The invention provides a two-dimensional bar code initial positioning method. The two-dimensional bar code initial positioning method comprises the steps of preprocessing an original two-dimensional bar code image and performing down-sampling processing; utilizing a binarization algorithm to process the image after down-sampling processing to obtain a Min-Max binarization picture; establishing a corresponding integral graph according to the binarized picture, and calculating to obtain candidate rectangular regions through an edge detection operator; calculating a direction gradient histogram EOH of edge points in the window, mapping candidate area coordinates meeting feature judgment to a grey-scale map of an original size through EOH feature judgment, outputting an approximate area of thetwo-dimensional bar code, and completing initial positioning operation. The invention provides a two-dimensional bar code initial positioning method. The method realizes rapid adaptive separation, and the approximate area im