Method for quickly vectorizing grid digital image

The invention discloses a method for quickly vectorizing a grid digital image. According to the method, on the basis of an image element, an adjacency relation between grid pattern spots is fully utilized, the large-scale searching process which is generated due to construction of a region boundary by tracking node generation arc sections is fundamentally avoided, and the complex processing situation caused by eliminating a complex region with a hole by constructing a polygonal topological relation by tracking arc sections is avoided, so vectorizing efficiency is greatly improved. Meanwhile, the method has the advantages that a single image element serves as a basic operating unit, the grid pattern spots in the grid digital image are directly converted into vector regions in the scanning process of a scanning line, any intermediate data are not generated in the vectorizing process, and the vectorizing process is independent of the intermediate data, so a computer memory is high in utilization efficiency and c