Anticounterfeiting method for a dot-matrix hologram composed of grating dots with different fringe orientations
Anticounterfeiting method for a dot-matrix hologram composed of grating dots with different fringe orientations
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不同条纹方向光栅点组成的点阵全息图的防伪方法
DOI：
10.1117/1.oe.54.11.113106
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发表时间：
2015
影响因子：
1.3
通讯作者：
Shyh
中科院分区：
文献类型：
--
作者：
S. Yeh;Shyh
抽象的。提出了一种识别由不同条纹取向的光栅点组成的点阵全息图的方法。选择两个相邻的光栅点，点1和点2。两个光栅点的两组条纹之间的交角必须小于阈值角，例如，50度点1和点2的重叠区域可以显示由许多条纹组成的莫尔图案。一些条纹包含与点1的条纹取向相同的条纹取向，一些条纹包含与点2的条纹取向相同的条纹取向，并且一些条纹包含与点1和点2的条纹取向不同的特殊条纹取向。含有特殊条纹取向的条纹在此称为过渡条纹，过渡条纹的数量（过渡条纹号）用于识别点1和点2。因为点对的过渡条纹数受点对之间的距离和两个点的光栅亮度分布的敏感影响，所以难以在点阵全息图上正确地再现光栅点对的过渡条纹数，即，伪造全息图并不容易。
Abstract. A method for identifying a dot-matrix hologram composed of grating dots with different fringe orientations is proposed. Two neighboring grating dots, Dot 1 and Dot 2, are selected. The intersection angle between the two sets of fringes of the two grating dots must be smaller than a threshold angle, e.g., 50 deg. The overlapping region of Dot 1 and Dot 2 can show a moiré pattern composed of many stripes. Some of the stripes contain the same fringe orientation as that of Dot 1, some of the stripes contain the same fringe orientation as that of Dot 2, and some of the stripes contain special fringe orientations different from those of Dot 1 and Dot 2. The stripes which contain special fringe orientations are called transition stripes here, and the number of transition stripes (transition stripe number) is used to identify Dot 1 and Dot 2. Because the transition stripe number for a dot pair is sensitively affected by the distance between the dot pair and the grating brightness distributions of the two dots, it is difficult to correctly reproduce the transition stripe numbers for the grating dot pairs on a dot-matrix hologram, i.e., counterfeiting the hologram is not easy.