Lou-Zo Chung’s research while affiliated with National Chung Cheng University and other places

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Publications (2)


A steganographic method based upon JPEG and quantization table modification
  • Article

March 2002

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327 Reads

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369 Citations

Information Sciences

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Tung-Shou Chen

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Lou-Zo Chung

In this paper, a novel steganographic method based on joint photographic expert-group (JPEG) is proposed. The proposed method modifies the quantization table first. Next, the secret message is hidden in the cover-image with its middle-frequency of the quantized DCT coefficients modified. Finally, a JPEG stego-image is generated. JPEG is a standard image and popularly used in Internet. The stego-image will not be suspected if we could apply a JPEG image to data hiding. We compare our method with a JPEG hiding-tool Jpeg–Jsteg. From the experimental results, we obtain that the proposed method has a larger message capacity than Jpeg–Jsteg, and the quality of the stego-images of the proposed method is acceptable. Besides, our method has the same security level as Jpeg–Jsteg.


A colour image compression scheme based on two-layer absolute moment block truncation coding

January 2000

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23 Reads

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8 Citations

The Imaging Science Journal

In this paper, a new approach for colour image compression is proposed which involves the absolute moment block truncation coding (AMBTC) and the single bitmap generation scheme. The first-layer AMBTC encodes a colour image and then comes up with three bitmaps and six quantization level arrays. Then, the single bitmap generation scheme combines the three bitmaps into one. After that, the second-layer AMBTC encodes six quantization arrays. The experimental results show that our method can obtain satisfactory results when the colour image has a monotonous hue.

Citations (2)


... Chang et al. [22] discussed the Two-Layer AMBTC scheme (TLAMBTC) to compress color images. Each quantization level is obtained from each of the CAMBTC-based R, G, and B layers divided into blocks. ...

Reference:

Data Hiding Method for Color AMBTC Compressed Images Using Color Difference
A colour image compression scheme based on two-layer absolute moment block truncation coding
  • Citing Article
  • January 2000

The Imaging Science Journal

... However, in text steganography this limitation can become apparent; no excessive modifications can be made without the changes being easily noticeable. Programmable text may involve forms such as whitespace manipulation, font changes, or synonym substitutions which are efficient in encoding data but rather embed limited payload capacity (Chang et al., 2008). According to the norms of steganography, the cover information should not be overloaded with hidden information which distorts its appearance. ...

A steganographic method based upon JPEG and quantization table modification
  • Citing Article
  • March 2002

Information Sciences