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| Research on Correlation between Paper Surface Characteristics and Hard CopyWatermark Extraction Quality |
| Received:January 05, 2019 |
| DOI：10.11981/j.issn.1000-6842.2020.02.69 |
| Key Words:paper surface performance;DCT watermark;correlation analysis |
| Fund Project:国家自然科学基金(31270629)；江苏省制浆造纸科学与技术重点实验室开放基金（201513）；特殊形态网点设计与防伪应用研究（2017NFUSPITP352）。 |
| Author Name | Affiliation | Postcode | | 葛乃馨* | 南京林业大学，江苏南京，210037 | 210037 | | 王琪 | 南京林业大学，江苏南京，210037 | 210037 | | 韩雪莹 | 南京林业大学，江苏南京，210037 | 210037 |
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| Abstract: |
| Measuring the basic surface properties of 7 kinds of paper，then the carrier image embedded with the DCT watermark was printed on the 7 kinds of papers through the electrostatic digital printing machine. The extracted watermark images with different resolutions was obtained by using a scanner ,and the most suitable scanning parameters was determined. The normalized correlation coefficient (NC value) was selected as the characterization parameter of watermark extraction quality. Combined with Pearson correlation statistical analysis theory, the effect of paper surface parameters on the extraction quality of hard copy watermark was evaluated. The results showed that the correlations between paper whiteness, roughness, smoothness and NC value were greater than 0.8, the gloss correlation value was slightly greater than 0.6, and the opacity value was less than 0.4. So the first three influencing factors had a strong correlation with the quality of watermark extraction, the influence of gloss was medium strong, and the influence of opacity was small. This study provided a guiding basis for paper selection before watermark hard copy output, which could effectively enhance the quality of watermark extraction and further expanded the application of watermark in packaging anti-counterfeiting. |
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