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A kind of computer-made rainbow hologram making method

A technology of rainbow hologram and production method, which is applied in the directions of calculation, image data processing, 3D image processing, etc., can solve unsolved problems, etc.

Inactive Publication Date: 2011-12-21
ZHEJIANG NORMAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

But above-mentioned scheme still does not solve the problem that above-mentioned prior art exists

Method used

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  • A kind of computer-made rainbow hologram making method
  • A kind of computer-made rainbow hologram making method
  • A kind of computer-made rainbow hologram making method

Examples

Experimental program
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Embodiment 1

[0106] Such as figure 2 , image 3 , Figure 4 , Figure 5 As shown, in this embodiment, three objects obtained by computer three-dimensional modeling are selected, and the computer-made rainbow hologram production method according to the present invention is used to first determine the points and slits of the recorded objects; Use formulas (18), (19) to calculate the position and size of the slit width direction of the corresponding line hologram, and use formulas (9), (10), and (11) to calculate the position and size of the slit length direction; then for each For each recorded object point, the wavelengths corresponding to the three primary colors are used to calculate the complex amplitude component in the slit width direction using the formula (4), the complex amplitude component in the slit length direction is calculated by the formula (7), and the formula (8) is used to calculate each The complex amplitude distribution of the sampling points; finally, the true-color...

Embodiment 2

[0109] Such as Image 6 , Figure 7 , Figure 8 As shown, this embodiment adopts the method as described in embodiment 1 to make a true-color rainbow hologram, and first scans a real person's head with a three-dimensional scanner to obtain Image 6 A screen shot of a true-color rainbow hologram was produced using the method described in Example 1, and the relevant parameters were the distance from the hologram to the slit Ze=300mm, the length of the slit le=100mm, and the width of the slit a=3mm, The size of the object is x=10mm, y=15mm, z=9mm, and the number of object points N is 68345 points.

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Abstract

The invention belongs to the technical field of rainbow hologram manufacturing and in particular relates to a method for manufacturing a rainbow hologram through a computer, which comprises the following steps: firstly, determining a recorded object point and a slit; secondly, calculating the position and the dimension of the slit hologram corresponding to the recorded object point; and finally simulating the light diffraction process and calculating a pattern structure of the rainbow hologram to obtain the rainbow hologram. The method is characterized in that the position and the dimension of the slit hologram in the horizontal direction are obtained through calculation according to optical diffraction effect; the position and the dimension in the vertical direction are obtained through calculation according to a geometrical optics principle; and the distribution of complex amplitude of object light consists of components of light wave reversely diffracted from the reappeared slit in two orthogonal directions of the horizontal direction and vertical direction. The method uses a component method to replace sine, square and other operations with large amount of calculation and greatly improves the calculating speed of the hologram.

Description

technical field [0001] The invention belongs to the technical field of making rainbow holograms, and in particular relates to a computer-made rainbow hologram making method. Background technique [0002] In 1968, Dr. Stephen A. Benton of MIT invented rainbow holography that can be reproduced under white light. Early optical holograms were photographed with lasers, which recorded static objects and required the production of actual models. [0003] Rainbow hologram is a hologram that can be reproduced under white light, and is widely used in holographic anti-counterfeiting trademarks, craft gifts and other industries. figure 1 It is the principle of rainbow hologram reproduction. When making a rainbow hologram, a certain method is used to set a slit between the hologram and the observer. When the hologram is reproduced, the recorded image can be observed at the reproduced image of the slit. A three-dimensional object (such as the object ABCD in the figure). Due to the limi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/00
Inventor 王辉李勇金洪震
Owner ZHEJIANG NORMAL UNIVERSITY
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