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Digital Watermarking Method Using Variance of Chrominance in the Pairs of Adjoining Blocks
Kei Sakiyama,Motoi Iwata,Akio Ogihara,Akira Shiozaki 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We propose a watermarking method that has robustness against geometrical slight distortions. The method is based on the variances of Cb and Cr components of an image. When a color image is geometrically distorted, Cb and Cr components on the same position cause the same distortion, and so the relation of variances of Cb and Cr components in a local region does not change easily. We embed each bit of a watermark into some adjacent local regions by changing the variances of Cb and Cr components so that the watermark may be robust to geometrical distortions.
Kei Sakiyama,Motoi Iwata,Akio Ogihara,Akira Shiozaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we propose a watermarking method that has robustness against geometrical slight distortions. The method is based on the variances of two color ceomponents of an image. We use YCbCr components. When an image is geometrically distorted, Cb and Cr components on the same position cause the same distortion, and the relation of variances of Cb and Cr components in a local domain does not change easily. So we embed a watermark by changing the variances of Cb and Cr components so that the watermark may be robust against geometrical distortions. Moreover we use discrete wavelet transform so as to be robust against JPEG compression.
Akio Ogihara,Takashi Iwamoto,Motoi Iwata,Akira Shiozaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
The objective of this work is to improve the sound quality of the audio watermarking method using smearing transformation. In this paper, we propose “Embedding Position Grouping” to improve the sound quality of watermarked audio.
Akio Ogihara,Ryota Sawada,Motoi Iwata,Akira Shiozaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we aim to improve the sound quality of the audio watermarking method using smearing transformation, which is proposed by M.Wakai et al. Since noise is caused by the signature impulse, we aim to reduce the power of the signature impulse. In our method, the signature impulse is filtered by low-pass filter, and then the filtered impulse is embedded.
Multiple Embedding for Time-Domain Audio Watermarking Based on Low-Frequency Amplitude Modification
Harumi Murata,Akio Ogihara,Motoi Iwata,Akira Shiozaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
The objective of this work is to increase the capacity of watermark information in the audio watermarking method based on low-frequency amplitude modification. We increase the capacity of watermark information by embedding multiple watermarks in individual data channels.
Akio Ogihara,Naoya Inoue,Motoi Iwata,Akira Shiozaki 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
The objective of this work is to increase the capacity of watermark information in the audio watermarking method based on amplitude modification. We increase the capacity of watermark information by dividing a GOS (Group of Samples) into five sections.
A Music Watermark in Consideration of Global Gain and Scalefactor in MP3 Compression
Akio Ogihara,Nobuhiko Maeda,Motoi Iwata,Akira Shiozaki 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The objective of this work is to demonstrate a new watermarking method for audio data in consideration of MP3 (MPEG audio layer-3) compression which is usually used in personal computer, portable IC audio player, etc.
Akio Ogihara,Naoya Inoue,Motoi Iwata,Akira Shiozaki 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
The objective of this work is to reduce the length of the synchronization code which is used as synchronization signal in the audio watermarking method based on amplitude modification.