Analysis of DQT and DHT in JPEG files

Abstract

JPEG files are the most popular image format that is commonly analysed in image forensics research areas. The compositions of these files are prominent to help accomplish the problem of source identification, content classification, forgery detection, steganography, encryption, and file recovery. The purpose of this paper is to present the overview of JPEG file format, as well as identifying important characteristics of its content, which are related to signature and compression features. For analysis purposes, we used about 80 JPEG files produced from several digital devices to examine their contents. The results show that it is possible to differentiate images among JPEG files and from other file types, by examining specific content of JPEG files.