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