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제안 방법
- Some techniques are highly resistant to geometric modifications, while others are more resistant to non-geometric modifications, like as filtering. An image quality index and bit capacity are employed to evaluate the proposed method, in which the secret data are stored behind the host image in a way imperceptible to human vision.
- This paper proposes a scheme that can provide a superior secret data embedding mechanism that is imperceptible to human vision. Moreover, the new method solves the fall off the boundary problem(FOBP).
- Wu and Tsai's pixel-value differencing is often referenced to embed secret data. In the proposed method, the experiment was based on selecting the range widths of 8, 8, 16, 32, 64 and 128, which partition the total range of [0, 255] into [0, 7], [8, 15], [16, 31], [32, 63], [64, 127], [128, 255]. We will explain the FOBP issue as it affects range width when using Wu and Tsai's method.
- In Section 2, we described how the FOBP occurred in both Wu and Tsai’s method and Chang and Tseng’s method. This study proposes a new method resolving the FOBP and which therefore improves on the method of Chang and Tseng. The data embedding and extracting processes are included in this paper.
- However, pixels in the edge areas were subject to the FOBP, and hence could not be used to embed secret data, even though they were more capable of holding secret data bits than those in smooth areas. In this paper, we proposed a new method that could both solve the FOBP and provided a good quality index value that was imperceptible to the human visual system. Moreover, there was no need to reference the cover image when extracting the embedded data from the stego-image.
- Moreover, there was no need to reference the cover image when extracting the embedded data from the stego-image. Our experimental results have shown that the proposed scheme provides an improved way to hide secret data.
이론/모형
- The cover data is embedded in raster-scan order except for the pixels of the first row and the first column, as treated in Chang and Tseng’s method.
- As with the embedding process, the data is extracted in raster-scan order like as Chang and Tseng’s method.
- The data embedding and extracting processes are included in this paper. Because the FOBP occurs in both methods, the proposed method can also be applied to the method of Wu and Tsai.
- Because the FOBP arises in both, as mentioned already, the proposed method is compared with Wu and Tsai’s pixel-value differencing method and Chang and Tseng’s two-sided side match scheme.
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