1. A computer-assisted method, comprising: receiving, via a mobile device, an image comprising a representation of at least a portion of a document; determining that symbolic content is on the at least the portion of the document based on the image; extracting symbol information based on the symbolic content according to symbol type; determining a validity of the document based at least in part on the image and the symbol information; and recognizing the document as a target object based at least in part on the image, the symbol information, and a query of a database storing target object information associated with a plurality of target objects; receiving an information address associated with the target object, wherein the information address comprises a response regarding the validity of the document.