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Method and device for generating hologram with watermark information

A technology of watermarking and hologram, which is applied to record carriers, instruments, computer parts, etc. used in machines, can solve problems such as damage to aesthetics, increase of false positive rate and response time, loss of brightness of hologram, etc., to solve the limitation performance, protecting aesthetics and brightness, reducing interference and false positives

Active Publication Date: 2018-02-13
上海冠众光学科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this simple combined application not only loses the brightness of the hologram but also destroys the aesthetics, and the interference of the holographic diffraction light when extracting the watermark information also increases the misjudgment rate and response time

Method used

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  • Method and device for generating hologram with watermark information
  • Method and device for generating hologram with watermark information
  • Method and device for generating hologram with watermark information

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Embodiment Construction

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0031] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".

[0032] figure 1 ...

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Abstract

The invention discloses a method for generating a hologram with watermark information. The method comprises the steps of selecting a watermark region on an original image, embedding the watermark information in the watermark region, and generating a watermark image with the watermark information; segmenting the watermark image into multiple different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph; preprocessing the watermark image to obtain at least one channel grayscale image; obtaining the grayscale value of each pixel point of the channel grayscale images; obtaining a grating angle value corresponding to the grayscale value of each pixel point of the channel grayscale images according to a preset corresponding relation list, obtaining grating strip frequencies corresponding to the pixel points according to the spatial frequency parameters corresponding to the regional graphs to which the pixelpoints of the channel grayscale images belong; using the obtained grating angle values of the pixel points of the channel grayscale images and the obtained corresponding grating strip frequencies to generate a data packet according to a preset rule, and obtaining the hologram with the watermark information according to the data packet.

Description

technical field [0001] The invention relates to the technical field of laser holographic anti-counterfeiting, in particular to a method and device for generating a hologram. Background technique [0002] Laser holographic anti-counterfeiting technology is a kind of visual graphic information produced on products by using laser rainbow hologram plate making technology and molded replication technology. With the comprehensive utilization of computer dot matrix lithography technology, 3D true color holographic technology, multiple and dynamic imaging technology and other technologies, the development of a higher level of laser holographic anti-counterfeiting technology has been promoted. Encryption technologies such as optical random interference fringe, optical miniaturization, dynamic holography, spatial stereo, and digital dot matrix images developed by using the above-mentioned technologies continue to emerge and become the mainstream direction of laser holographic anti-cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/02G06K19/06G03H1/08
CPCG03H1/08G06K19/022G06K19/06046G06K19/06065
Inventor 桑建新姜振飞董明胡祖元张春炜
Owner 上海冠众光学科技有限公司
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