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Please use this identifier to cite or link to this item: http://hdl.handle.net/11133/1555

Title: DCTおよびVQを用いた画像電子透かし
Other Titles: DCT オヨビ VQ ヲ モチイタ ガゾウ デンシ スカシ
Digital watermarking for images using DCT and VQ
Authors: 柴田, 且崇
沢田, 克敏
中村, 栄治
SHIBATA, Katsutaka
SAWADA, Katsutoshi
NAKAMURA, Eiji
Issue Date: 31-Mar-2012
Publisher: 愛知工業大学
Abstract: This paper describes two digital watermarking methods using DCT (Discrete Cosine Transform) and VQ (Vector Quantization). A bi-level (1 bit/pixel) watermarking image has been embedded in target gray scale images. In the DCT watermarking method, DCT coefficients of target gray scale images are modified by watermarking information 1/0. In the VQ watermarking method, a VQ code book is divided to 2 groups which are assigned to watermarking information 1/0, respectively. Experiments have been carried out. The SNR (Signal to Noise Ratio) of embedded target images and the BER (Bit Error Rate) of extracted watermarking information have been studied. Our Experimental results have shown that the DCT method is superior to the VQ method.
URI: http://hdl.handle.net/11133/1555
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