Kazumi Yamawaki

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This paper presents a modified QIM-JPEG2000 steganography which improves the previous JPEG2000 steganography using quantization index modulation (QIM). Since after-embedding changes on file size and PSNR by the modified QIM-JPEG2000 are smaller than those by the previous QIM-JPEG2000, the modified QIM-JPEG2000 should be more secure than the previous(More)
We have proposed a reversible information hiding for binary images. In this paper, we presents a lossless data hiding method for JPEG2000 compressed data based on the reversible information hiding. In JPEG2000 compression, wavelet coefficients of an image are quantized,therefore, the least significant bit plane (LSB) can be extracted. The proposed method(More)
An application of information hiding to image compression is investigated to improve compression efficiency for JPEG color images, where entropy coded DCT coefficients of chrominance components are embedded into DCT coefficients of luminance component. In the proposed method, a color image is changed to a JPEG gray image with only luminance component. A(More)
We present a lossless data hiding method for JPEG2000 compressed data based on the reversible information hiding for binary images we have proposed. In JPEG2000 compression, full color images with RGB three colors are transformed to YCrCb color space, and then, for each color component, wavelet transform, quantization and entropy coding are performed(More)
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