Passive information hiding method and system based on feature mapping

The invention discloses a passive information hiding method based on feature mapping, and the method comprises the steps: setting a configurable feature attribute set in an information hiding stage; constructing a feature attribute set and a feature value for each target type, constructing a target type set with configurable features, and listing mapping between the feature value and a binary sequence value for each target type in the target type set; slicing the hidden binary information, forming a target set and feature composition according to a mapping relationship, generating a picture of the target set by using a camera device, and sending the picture to a receiver through a public network; in the information extraction stage, target identification is carried out on the received picture, each feature value of a target is obtained, a binary sequence is correspondingly formed according to the mapping relation, and information hidden in the binary sequence is extracted. According to the method, information