1. An image-based transaction system comprising: an image sensor configured to capture image data of a face; and an image processing device coupled with the image sensor and configured to: recognize the face as a known target object from a known object database based on features derived from the image data; retrieve target object information from a information indexing system and that is associated with the known target object, and wherein the target object information includes an address and an identity of a specific known target object associated with the face; and enable a device to initiate a transaction based on the target object information, at least using the address and the identity, where the transaction relates to the specific known target object.