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In JPEG-to-JPEG image watermarking (J2J), the input is a JPEG image file. After watermark embedding, the image is JPEG-compressed such that the output file is also a JPEG file. In this paper, we use the human visual system (HVS) model to estimate the J2J data hiding capacity of JPEG images, or the maximum number of bits that can be embedded in JPEG-compressed images. Watson's HVS model is modified to estimate the just noticeable difference (JND) for DCT coefficients. The amount of modificationsdoi:10.1109/tcsvt.2003.815949 fatcat:7gqtwihy6zab7g6tkyxvwwyhbe