Si-Hui Li

Northeast Normal University, Hsin-ching, Jilin Sheng, China

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Publications (2)0 Total impact

  • Ying-Hua Lu · Jing Qin · Jun Kong · Si-Hui Li
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    ABSTRACT: This paper proposes a watermarking technique based on image features. Four subimages are obtained from the host image by using subsampling. Wavelet transform is applied to the subimages. A key will be formed by comparing the DWT mid-frequency coefficients of the subimages. In contrast to conventional approaches, our method can strengthen the fidelity of images through considering local image characteristics, without sacrificing the robustness of images. Watermark extracting is simply by the key and does not need original image. Experimental results are promising. This technique is significant to medical images, military images and so on.
    No preview · Conference Paper · Dec 2007
  • Ying-hua Lu · Jun Kong · Si-hui Li · Jing Qin
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    ABSTRACT: In this paper, we proposed a novel image steganographic method. Considering the visual quality of the stego-image, the pixels of host image are classified into three groups according to the noise visibility function values of the pixels. For each group of pixels, the corresponding secret pixel values go through an optimal substitution process and are transformed into other pixel values. Then the optimal substitution is obtained by dynamic programming strategy. To get the good image quality of the stego-image, the modulus function is employed to hide the secret bits into host pixels. According to our experimental results, this method can provide better stego-image quality than some traditional schemes.
    No preview · Article · Jan 2007