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Content loaded within last 14 days Effects of Dot Configuration on Color Reproduction and Anti-counterfeiting Features

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Abstract

This study represents an attempt to solve the problem of color reproduction and identification for the prevention of stamp forgery. Generally, printed images are converted to halftone dot patterns by using a raster image processor. The amplitude-modulated dots of each separated color plane have a consistent shape such as conventional round, square, ellipse, or diamond shape; error diffusion occurs in frequency-modulated dots. To achieve anti-counterfeiting properties for stamp reproduction, two methods are proposed to obtain difficult-to-replicate dot structures and to provide corresponding color management methods. The first method involves arranging different dot shapes in different areas of an image. Color consistency is achieved using a virtual gray balance method. However, color differences are visible when two dot types are assigned to adjacent areas with similar colors. The second method is a two-stage screening method. The first screening stage defines different micro-regions in the image, which are then combined with the continuous-tone image again in the second screening step to assign different dot patterns to different micro-regions. This approach not only provides anti-counterfeiting ability but also ensures color consistency and allows controlling color quality using one ICC profile.
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Document Type: Research Article

Affiliations: 1: National Taiwan University of Science and Technology, Graduate Institute of Applied Science and Technology, TR-930, 9FL, Aaeon Building, No. 43, Sec. 4, Keelung Rd., Taipei City, N/A 106, Taiwan 2: National Taiwan University of Science and Technology, Graduate Institute of Color and Illumination Technology, 46, Keelung Rd., Sec. 4, Taipei, N/A 10607, Taiwan

Publication date: March 1, 2021

This article was made available online on November 25, 2020 as a Fast Track article with title: "Effects of Dot Configuration on Color Reproduction and Anti-counterfeiting Features".

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  • The Journal of Imaging Science and Technology (JIST) is dedicated to the advancement of imaging science knowledge, the practical applications of such knowledge, and how imaging science relates to other fields of study. The pages of this journal are open to reports of new theoretical or experimental results, and to comprehensive reviews. Only original manuscripts that have not been previously published, nor currently submitted for publication elsewhere, should be submitted.

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    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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