Color halftoning based on Neugebauer Primary Area Coverage

Jiang, Wanling; Xi, Weijuan; Sarkar, Utpal; Ulichney, Robert; Allebach, Jan P.

doi:10.2352/issn.2470-1173.2017.18.color-041

Cited by 1 publication

(1 citation statement)

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“…13,20 The combination that resulted in finest halftone texture and relatively strong watermark signal was: functions means that their spatial support is relatively short, which reduces the effect of nonpreserving averages and it lead to finer halftone textures. We used this parameter setting for all of the prints in this work.…”

Section: [ ]mentioning

confidence: 99%

Data Hiding by White Modulation in Color Direct Binary Search Halftones

Kitanovski¹,

Eschbach²,

Pedersen³

et al. 2017

jist

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In this paper, we propose a method for hiding a visual watermark in color printed images with arbitrary, natural content. The embedded watermark is imperceptible under normal illumination, but it is revealed under UV illumination. Our method is using the white paper fluorescence as a source of the watermark signal. The binary visual watermark is embedded by controlling the amount of fluorescence during the halftoning process, which is achieved by modulating the fractional white area of exposed paper substrate. Our method is based on the iterative Color Direct Binary Search halftoning, which ensures high quality of the printed images, and uses a suitable error metric to control the perceived distortion due to the watermark embedding. Results show that the proposed method achieves low perceptibility of the embedded watermark under normal illumination, while the watermark is easily detectable using a portable UV flashlight even in bright daylight conditions.

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Section: [ ]mentioning

confidence: 99%