Use of Gap-Filling Operation to Enhance Image Quality of Binary Image Watermarking

Ebisawa, Ryu; Fujii, Yuki; Yamada, Takeshi; Tezuka, Satoru; Echizen, Isao

doi:10.1109/iih-msp.2007.316

Cited by 2 publications

(4 citation statements)

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“…For instance, a printed image watermarked using our previous method has a practical level of quality [9]. A watermarked image displayed at a specific resolution on a display panel may have the same quality as the unwatermarked version.…”

Section: Problems With Conventional Methodsmentioning

confidence: 99%

“…Consider, for example, the embedding of a watermark in the pixel values of one image [9]. Embedding process: Each element of a watermark pattern is calculated by multiplying the corresponding element of watermark strength and pseudo random number, that is,…”

Section: A Conventional Watermarking Algorithmmentioning

confidence: 99%

“…Note that i s is calculated by referring surrounding pixels of i -th pixel on the basis of human visual system [9]. Watermarked image y′ is obtained by adding the watermark pattern m to original image y .…”

Section: Definition: Notation Definitionmentioning

confidence: 99%

“…We developed a prototype for embedding watermarks in images that is based on our previous method [9]. Parameters α and β are used to restrict the range of pixel value modification, as described in section III-C. Binary factors t are used to restrict the number of modifiable pixel.…”

Section: Experimental Evaluationmentioning

confidence: 99%

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Maintaining image quality when watermarking grayscale comic images for electronic books

Yamada

Ebisawa

Takahashi

2011

2011 9th IEEE International Conference on Industrial Informatics

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Digital watermarking of comic images effectively protects the copyright of the content in electronic book applications. The characteristics of comic images were analyzed to determine the effect of digital watermarking on the line shapes. Modification of the shape edges by conventional watermarking methods can degrade image quality because the human eye is sensitive to the edges. The analysis revealed that slight changes in the black pixels in a comic image are barely perceived by the human eye when the image is displayed on a tablet PC. A method was then developed for embedding watermarks that minimizes modification of the white pixels compared to modification of the black ones. Experimental evaluation showed that this method improves the quality of watermarked grayscale comic images. Watermark robustness was almost the same as that with the conventional method in an assumed use case.

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Section: Problems With Conventional Methodsmentioning

confidence: 99%

Section: A Conventional Watermarking Algorithmmentioning

confidence: 99%

Section: Definition: Notation Definitionmentioning

confidence: 99%

Section: Experimental Evaluationmentioning

confidence: 99%

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