Abstract: Remote sensing images are compressed in JPEG2000 standard and transmitted to ground by aircraft, while some other telemetry data is needed in transmission and additional data is embedded in compressed files. The author researched JPEG2000 data structure and transformed the data part of the compressed file into an image and blocked it, and then made statistics on 256 gray values to find gray values with the most occurrences and zero occurrence. Corresponding bytes of these gray values were mapped to represent different binary secret data. Receiver extracted secret data by mapping and recovered host modified bytes. Hiding capacity has an improvement of average 500bits, PSNR of marked images are larger than 30dB,and host data can still be restored losslessly. Experimental results show that this scheme can realize lossless information carrying in JPEG2000 images and file expansion does not occur.

Key words: JPEG2000, compressed domain, lossless data hiding, code stream mapping, remote sensing images