GIS 웹 맵 서비스 구현을 위한 스마트 폰에서의 정보은닉 기법

Abstract

Recently, mashup service for user convenience is appearing as a synthesis technology among other lateral technologies in user-centered Internet web service environment of web 2.0. Due to the development of mobile embedded technology along with recent Internet environment ,not only can specific experts make multimedia contents but general users can manufacture and edit them in GUI environment. Thereby, multimedia contents of user's own making is increasing rapidly. Problems caused by these are that there are no protective measures to protect intellectual property of multimedia contents and invasion of privacy of users. This study suggested techniques concealing location information of GPS and user information for user privacy protection and tracing illegal photographers in GIS Web-Map mashup service. Proposed techniques conceal position information in chrominance signal using bit weight considering quantization modulation to minimize error range of coordinate value, conceal luminance signal on integer-based 5/3 Tab DWT domain, having equipment identity number, telephone number, and information on photographing date as watermark, in order to track and search out illegal photographers. As a result of experiment, it was found that there was reliable error range for various image processing in inserting location information and the limitation of existing Geo-Tagging technique could be overcome, with which information is inserted into file header and the header information is deleted, by accurately extracting location information even in format conversion. As a result of experiment for concealing information on the first illegal photographer by inserting into luminance signal, I could detect all information inserted to damaged images by various attacks through similarity pattern matching. In addition, I implemented suggested watermarking technique in mobile smart phone and built web service using commercial open source GIS Web-Map in order to reveal safe GIS Web- Map service. At this, I developed client tool for downloading pictures in PC and transmitting location information and pictures to web server.