Batch QR code image extraction method and system

The invention discloses a batch QR code image extraction method and system, and the method comprises the steps: firstly carrying out the gray scale transformation and filtering denoising of a high-resolution image which is actually photographed and comprises a plurality of QR codes; extracting an edge gradient value by adopting an edge detection method, and obtaining an edge image through truncation normalization; setting an initial value of the block size, and determining the optimal block size after iterative search; carrying out partitioning, feature calculation and threshold segmentation again according to the optimal partitioning size, obtaining a candidate rectangular frame set through marking block clustering, and removing rectangular frames which obviously do not meet the QR code area features through screening; and finally, through a compressed and trained lightweight and high-performance mobile Net series classifier, judging whether a candidate box contains a QR code patternor not, removing a backgr