Invoice image recognition method and system based on image processing

The invention relates to the technical field of image processing, in particular to an invoice image recognition method and system based on image processing. The method comprises the following steps: obtaining a difference image only containing machine-printed content; according to a gradient histogram of edge pixel points in the difference image; selecting an edge pixel point in a preset gradient direction as an angular point, and screening to obtain a first angular point; obtaining a character region, wherein the character region is a minimum enclosing rectangle of a complete machine-typed character string; screening the first corner points around each character in all the character areas by using the structure parameters between the first corner points to obtain the structure corner points of all the characters in the character areas; and segmenting and identifying the characters according to the coordinates of the structure angular points belonging to each character in the character region. Redundant angul