Construction method of precise template local graph database, and acquisition method and device of precise template image corresponding to image to be detected

The invention provides a construction method of a precise template local graph database and an acquisition method and device of a precise template image corresponding to a to-be-detected image, and belongs to the technical field of image processing. In the method, precise template local graphs are grouped based on center coordinate points of the precise template local graphs; according to the method and the device, the precise template local maps in the precise template local map groups are divided into multiple groups, then the precise template local maps in the precise template local map groups are spliced, so that the spliced image is obtained, subsequent acquisition of the precise template image corresponding to the to-be-detected image can be realized according to the spliced image, and the spliced image is obtained by splicing the precise template local maps, so that the accuracy of the precise template image is improved. The resolution of the spliced image is high, and the size of the spliced image is