Influence of Output Types on Extraction Quality of Holographic Watermark

XIE Yong, WANG Kai-li, LIU Lin, TAN Hai-hu

Packaging Engineering ›› 2017 ›› Issue (15) : 161-167.

Packaging Engineering ›› 2017 ›› Issue (15) : 161-167.

Influence of Output Types on Extraction Quality of Holographic Watermark

  • XIE Yong, WANG Kai-li, LIU Lin, TAN Hai-hu
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Abstract

The work aims to study the influence of hardcopy types on extraction quality of holographic anti-counterfeiting watermark in the printed image, in order to effectively predict the quality of watermark extracted from the images outputted from the printing. Firstly, the high-frequency component of Fourier holographic watermark was embedded into the middle-frequency area of the host image subject to wavelet transform for twice, so as to hide the information. Then, four common hardcopy types (inkjet, laser, offset printing and digital printing) were used to output watermarked anti-counterfeiting images, and the watermark extraction quality of hardcopy image was evaluated with NC parameters from three aspects, including paper surface quality of printed material, color space conversion of images and output accuracy. In addition, the factors that influence the watermark extraction quality were compared and analyzed. Experiment results showed that the watermark extraction qualities between digital image, presswork and printing images were very different, and the rank was: inkjet printing> offset printing> digital printing and laser printing. The printed substrate paper with higher whiteness and gloss was beneficial to watermark extraction. The multiple color space conver-sions of watermarked image in output and input process to some extent affected the color distribution and reproduction quality of original image and further the watermark extraction quality. On the premises of satisfying the image reproduction quality, the output resolution had little effect on watermark extraction quality. It is not possible to replace the actual output type with simulated attacks or desktop printing when studying the anti-print/scan robustness of watermarking. The substrate paper with high surface quality facilitates the identification of anti-counterfeiting watermark information. The resolution is appropriate as long as the reproduction quality requirements are satisfied when verifying the anti-print/scan robustness of watermarking scheme.

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XIE Yong, WANG Kai-li, LIU Lin, TAN Hai-hu. Influence of Output Types on Extraction Quality of Holographic Watermark[J]. Packaging Engineering. 2017(15): 161-167

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