1. A method, comprising: retrieving, by one or more processors, a target image to be detected from a predetermined area; binarizing, by the one or more processors, the target image to be detected to obtain a target binary image to be detected, wherein the target binary image to be detected corresponds to a binary image of the target image to be detected and a negative image of the binary image; calibrating a plurality of connected domains of the target binary image to be detected, wherein each of the plurality of connected domains corresponds to an area of the target binary image; retrieving, by the one or more processors, a set of one or more image features of a plurality of candidate connected domains, and comparing at least one of the set of one of more image features corresponding to the plurality of candidate connected domains to image features of a standard specified identifier image, wherein the plurality of candidate connected domains are determined based at least in part on a result of calibrating the plurality of connected domains; and determining, by the one or more processors, a candidate connected domain among the plurality of candidate connected domains as a location of the standard specified identifier image based at least in part on the a result of the comparing of the at least one of the set of one or more image features corresponding to the plurality of candidate connected domains to image features of the standard specified identifier image.