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RISS 인기검색어
- 검색키워드
- 저자 : D.Vaishnavi (검색결과 3 건)
- 무료
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Fragile Watermarking Scheme Based on Wavelet Edge Features
D.Vaishnavi,T.S.Subashini 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.5
This paper proposes a novel watermarking method to discover the tampers and localize it in digital image. The image which is to be used to generate a watermark is first wavelet decomposed and the edge feature from the sub bands of high frequency coefficients are retrieved to generate a watermark (Edge Feature Image) and which is to be embed on the cover image. Before embedding the watermark, the pixels of cover image are disordered through the Arnold Transform and this helps to upgrade the security of the watermark. The embedding of generated edge feature image is done only on the Least Significant Bit (LSB) of the cover image. The invisibleness and robustness of the proposed method is computed using Peak-Signal to Noise Ratio (PSNR) and Normalized Correlation (NC) and it proves that the proposed method delivers good results and the proposed method also detects and localizes the tampers efficiently. The invisibleness of proposed method is compared with the existing method and it proves that the proposed method is better.
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Fragile Watermarking Scheme Based on Wavelet Edge Features
Vaishnavi, D.,Subashini, T.S. The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.5
This paper proposes a novel watermarking method to discover the tampers and localize it in digital image. The image which is to be used to generate a watermark is first wavelet decomposed and the edge feature from the sub bands of high frequency coefficients are retrieved to generate a watermark (Edge Feature Image) and which is to be embed on the cover image. Before embedding the watermark, the pixels of cover image are disordered through the Arnold Transform and this helps to upgrade the security of the watermark. The embedding of generated edge feature image is done only on the Least Significant Bit (LSB) of the cover image. The invisibleness and robustness of the proposed method is computed using Peak-Signal to Noise Ratio (PSNR) and Normalized Correlation (NC) and it proves that the proposed method delivers good results and the proposed method also detects and localizes the tampers efficiently. The invisibleness of proposed method is compared with the existing method and it proves that the proposed method is better.
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Ankola Kunal,Aishwarya D.,Anusha R.,Vaishnavi N.,Supriya V.K.,Puttaraju H.P. 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Puddling in butterflies is an essential physiological phenomenon, by which they gain mineral nutrients required for their reproductive success and flight. The preference given to the puddling by butterflies has been analysed by two hypotheses: butterflies puddle when there is a scarcity of nutritional resource in one hypothesis and competition with other males to increase their probability of mating in the other. In the present investigation, an attempt has been made to verify these hypotheses through experimental evidences in the butterfly Papilio polytes, in which only males are known to puddle. Our investigation revealed the significance of puddling as an alter native source of nutrition in the absence of nectar. However, increase in the number of males in a given vicinity with constant number of females enhances the puddling activity in males. This shows the importance of puddling as a distinct competitive behaviour by which male improves their chances of mating. Additionally, in both cases the puddling is drastically regulated by the environmental temperature. Males prefer to puddle at a temperature ranging from 26 ◦ C to 28 ◦ C, which is considered as optimum for puddling activity. Further, the fecundity and longevity of imago are completely unaffected by puddling activity. All these results are in good agreement with the existing hypotheses and show the behavioural significance of puddling in butterflies.
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