Abstract: A system for recognizing a text image in an image photographed by an image sensor as characters, searching the characters in an electronic dictionary, and displaying a search result on a window. The image sensor includes a photographing section configured to photograph an image; a determination section configured to determine the photographed image as at least one of a text image region and a non-text image region; and a conversion section configured to convert information of the determined text image region into binary information.

Abstract: An image sensor for detecting a counterfeit bill includes an ultraviolet ray emitting section for emitting ultraviolet rays to a bill to be checked; an image sensor section for acquiring a first image as an image obtained by photographing the bill to be checked in a state in which ultraviolet rays are not emitted by turning off the ultraviolet ray emitting section, and a second image as an image obtained by photographing the bill to be checked in a state in which ultraviolet rays are emitted by turning on the ultraviolet ray emitting section; a storing section for storing the first image and the second image; and a counterfeit bill detecting section for extracting a fluorescent image by removing the first image from the second image stored in the storing section and determining whether the bill to be checked is a counterfeit bill or an original bill.