A three-channel metasurface multiplexing method for superimposing watermarks in continuous grayscale images
A technology of grayscale image and watermark image, applied in the field of micro-nano optics, to achieve the effect of compact structure, simple design process and improved security
Active Publication Date: 2021-10-22
WUHAN UNIV
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Problems solved by technology
The current anti-counterfeiting methods for metasurfaces still need to be improved in terms of structural simplicity, design flexibility, information density, and anti-counterfeiting security.
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[0041] For a better understanding of the present invention, the following examples are further descriptions of the present invention, but the content of the present invention is not limited to the following examples.
[0042] The invention provides a design method of a high and low frequency multiplexed metasurface anti-counterfeiting image with a watermark, such as figure 1 shown, including the following steps:
[0043] First, an array of nanobricks is constructed. The nano-brick array includes a plurality of nano-brick structural units. The nano-brick structural unit includes a working surface and nano-bricks arranged on the working surface. The x-axis and the y-axis are respectively set as the x-axis and the y-axis parallel to the two sides of the working surface to establish the xoy coordinates. The nano-brick has a long axis L and a short axis W on the surface parallel to the working surface. The nano-brick also has a height H perpendicular to the working surface. The st...
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The invention relates to the field of micro-nano optics and optical anti-counterfeiting technology, and discloses a three-channel metasurface multiplexing method for superimposing watermarks on continuous grayscale images, including: a nano-brick array, the nano-brick array includes a plurality of nano-brick structural units , optimize to obtain at least two sets of alternative size parameters with different spectral responses of nanobrick structural units; select three-channel metasurfaces for multiplexed continuous grayscale images, watermarked images and binary images; according to continuous grayscale images and watermarked anti-counterfeiting images , design the steering angle of the nanobricks in the nanobrick array; according to the binary image, select the nanobrick structural units of the corresponding size from multiple groups of optional size parameters for arrangement; according to the above nanobrick unit structure size parameters and the nanobrick The nano-brick unit structure is arranged at the steering angle to obtain a three-channel metasurface material. The invention can realize the multiplexing of three-channel information through a single metasurface array structure, and has the characteristics of compact structure, high information density and strong concealment.
Description
technical field [0001] The invention relates to the technical field of micro-nano optics, in particular to a three-channel metasurface multiplexing method for superimposing watermarks on continuous grayscale images. Background technique [0002] In production and life, anti-counterfeiting of various items has always been a concern. Watermark anti-counterfeiting image is a commonly used anti-counterfeiting method, but with the development of technology level, only using watermark anti-counterfeiting image for anti-counterfeiting is not concealed enough and easy to be imitated, so the security obviously cannot meet the growing anti-counterfeiting needs. [0003] Metasurface materials can flexibly and effectively control the amplitude, phase, and polarization state of light electromagnetic fields at the subwavelength scale, and have the advantages of small size, light weight, and convenient processing, and have been widely used in various fields of optics. In the metasurface d...
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IPC IPC(8): G06T1/00
CPCG06T1/0078G06T2201/005
Inventor 郑国兴梁聪玲李子乐单欣李仲阳
Owner WUHAN UNIV