AN IMPROVED JPEG2000 STEGANOGRAPHY USING QIM AND ITS EVALUATION BY STEGANALYSIS

摘要

This paper presents a modified QIM-JPEG2000 steganography which improves the previous JPEG2000 steganography using quantization index modulation (QIM). Post-embedding changes in file size and PSNR by the modified QIM-JPEG2000 are smaller than those by the previous QIM-JPEG2000. Ste-ganalysis experiments to determine whether messages are embedded in given JPEG2000 images show that the modified QIM-JPEG2000 is more secure than the previous QIM-JPEG2000.