CN1356603A

CN1356603A - Method for generating synthetic hologram by digital microreflector

Info

Publication number: CN1356603A
Application number: CN 01142856
Authority: CN
Inventors: 王金成; 郭欢庆; 郎海涛; 刘惠萍
Original assignee: Ocean University of Oingdao
Current assignee: Ocean University of Oingdao
Priority date: 2001-12-29
Filing date: 2001-12-29
Publication date: 2002-07-03
Anticipated expiration: 2021-12-29
Also published as: CN100363847C

Abstract

A technology for preparing composite hologram by digital microreflector includes taking the image of 3D object by digital camera, inputting it to computer, decomposing it into n images and 3n trichromatic gray-scale films, sequentially inputting them to DMD, laser reading out, imaging on a scattering screen, recoridng the fresnel holograms of 3n images, preparing planar hologram, and reproducing the true-colour 3D image. Its advantages include no influence of LCD, high light transmission and high S/N ratio.

Description

Method with generating synthetic hologram by digital microreflector

Technical field

The present invention relates to a kind of new optoelectronic information treatment technology, especially the 2 d fluoroscopy sheet can be integrated into the 3 D stereo hologram, and combine with the photoetching mould pressing technology, can realize the method that light, mechanical, electrical, as to calculate integrated integral hologram mechanization is produced with generating synthetic hologram by digital microreflector.Be mainly used in packaging industry decoration, decoration and false proof etc., also can be used for commercial advertisement, industrial design, large-scale exhibition, decorate and decorate and beautify field such as people's life.

Background technology

In the prior art, the existing common holographic technique that can write down and reproduce the 3-D view of real-world object, have again develop on this basis and come can the record personal portrait and pulse laser holographic technique, computer-generated hologram technology and the synthetic hologram technology of moving object, and carry out digital synthetic hologram technology as spatial light modulator with the driven with active matrix Thin Film Transistor-LCD (TFT-LCD) of electrical addressing.But under common experiment condition, common holographic technique only is applicable to the small-sized static object.The reproduced image quality that calculation holographic obtains is also far away from traditional display holography technology, and they are very low to the counting yield of some complex objects or large-sized object, therefore their range of application is very limited, and the pulse laser holographic technique is because of the cost costliness, technical sophistication and be difficult to apply.The defective of traditional synthetic hologram maximum is that experiment needs manual operations, lasts length, complex steps, makes mistakes easily.The existing problem of the system design that utilizes TFT-LCD to carry out: the one, the electrode structure of LCD (LCD) has a strong impact on the quality of hologram; The 2nd, the aperture opening ratio of LCD is very little, influences the light transmission rate of LCD to a great extent; The 3rd, polarized light is added the ABSORPTION AND SCATTERING of birefringence effect and light etc., has reduced the signal to noise ratio (S/N ratio) of hologram.

Summary of the invention

In order to overcome the existing large-scale dynamic object of can not taking pictures in the prior art, counting yield is low, is of limited application, and needs manual operations, and complex steps is easily made mistakes; Particularly LCD influences the quality of hologram and light transmission rate is little and reduce the deficiencies such as signal to noise ratio (S/N ratio) of hologram, according to the theoretical foundation of System of Digital Synthetic Generated Hologram and the structure and the performance characteristics of nearest emerging photoelectric device digital micro-mirror (DMD), the invention provides a kind of hologram that both can obtain all three-dimensional bodies, can design and produce voluntarily as required again in the actual life and the 3-D view of non-existent various dummy objects, can overcome existing various defectives in the prior art, the sharpness of gained image and breadth all are better than using the image of TFT-LCD gained greatly, processing step is few, the method with generating synthetic hologram by digital microreflector of process full-automation.

The technical solution adopted for the present invention to solve the technical problems is: the substantial improvements of being given prominence on the basis of known TFT-LCD system, emphasis is a traditional concept of breaking people, replace TFT-LCD as photomodulator with DMD, corresponding light route rear projection type changes reflection-type into.It is the method with generating synthetic hologram by digital microreflector of the present invention, comprise following process steps: 1. use digital camera three-dimensional body to be taken by setting the visual angle, 2. the 1 above-mentioned image of taking is input to and carries out following processing in the computing machine: 1. be decomposed into n width of cloth separate picture and set the corresponding visual angle of every width of cloth, 2. every width of cloth is further divided into three color shade sheets, 5. write down the Fresnel hologram of 3n width of cloth image by visual angle coding and color-coded requirement, 6. with the Fresnel hologram system image plane holographic figure of 5 above-mentioned gained, 7. under white light, reproduce original true color 3-D view, it is characterized in that this method also comprises, come after above-mentioned the 2nd step for 3. before the 5th step under computer control, 3n width of cloth picture is imported among the DMD by the visual angle order, 4. from DMD, read image with laser, and image in these two steps on the diffuser screen.

Any is taken apparatus and by the visual angle of setting three-dimensional body is taken in also available CCD (charge-coupled image sensor) or CMOS (metal-oxide semiconductor (MOS)) camera, the scanner in the above-mentioned step 1.

The n of above-mentioned step 2 in 1. is 60～200.

The invention has the beneficial effects as follows: the hologram that both can obtain all three-dimensional bodies with this method, can design and produce voluntarily as required again in the actual life and the 3-D view of non-existent various dummy objects, be not subjected to any restriction of lab space and condition, that is both can adopt various digital picture pickup apparatus such as digital camera, CCD or CMOS camera, scanner etc. to obtain the abundant natural scene even the picture material of portrait easily, import then, handle; Also available computers trivector figure design software is directly made the required image effect; Divide frame output then; The image three-dimensional and the dynamic effect that make with this method are all very strong, because adopted that resolution height, reflectivity are big, GTG and the high digital micro-mirror of contrast change reflection-type into as modulator and with corresponding light path, so the image that makes is better than using TFT-LCD gained image greatly on sharpness and breadth; This method combines with the photoetching mould pressing technology and can realize mechanization production light, mechanical, electrical, the integrated integral hologram of calculation, but also can be used for commercial advertisement, industrial design, large-scale exhibition, decorates decoration and beautify people's life, and purposes is very extensive.

Embodiment

One of embodiments of the invention are: the lion in the zoo is taken by setting the visual angle with camcorder, and the image of taking is input to carries out following processing in the PC type computing machine: 1. be decomposed into 130 width of cloth separate pictures, and set the visual angle of every width of cloth correspondence, 2. every width of cloth is further divided into three color shade sheets, in following 390 above-mentioned width of cloth pictures of computer control are imported into the digital micro-mirror of IQ02 type (DMD) in order, the laser that sends with gas laser is read image from DMD then, and image on the diffuser screen, and then write down the Fresnel hologram of 390 width of cloth images and with they system image plane holographic figure by visual angle coding and color-coded requirement, last under white light the true color 3-D view of reproduction lion.

Two of embodiment is: take in the computing machine that three-dimensional natural scene is input to other models by the visual angle of setting with the CCD camera, be decomposed into 60 width of cloth, send laser with solid state laser, other steps are all with embodiment one.

Three of embodiment takes personal portrait with the CMOS camera, is decomposed into 200 width of cloth, and the laser instrument of exporting with other continuous powers sends laser, and other are with embodiment one.

Change as present embodiment:

1, the object that is taken can be any three-dimensional body;

2, used computing machine, laser instrument, capture apparatus, the model of DMD all can suitably change;

3, can also not take, and directly design and produce voluntarily on computers in the actual life and the image of non-existent dummy object with computing machine trivector design software.

Claims

1, a kind of method with generating synthetic hologram by digital microreflector, comprise following process steps: 1. use digital camera three-dimensional body to be taken by setting the visual angle, 2. the 1 above-mentioned image of taking is input to and carries out following processing in the computing machine: 1. be decomposed into n width of cloth separate picture and set the corresponding visual angle of every width of cloth, 2. every width of cloth is further divided into three color shade sheets, 5. write down the Fresnel hologram of 3n width of cloth image by visual angle coding and color-coded requirement, 6. with the Fresnel hologram system image plane holographic figure of 5 above-mentioned gained, 7. under white light, reproduce original true color 3-D view, it is characterized in that this method also comprises, come after above-mentioned the 2nd step for 3. before the 5th step under computer control, 3n width of cloth picture is imported among the DMD in order, 4. from DMD, read image with laser, and image in these two steps on the diffuser screen.

2, the method with generating synthetic hologram by digital microreflector according to claim 1 is characterized in that in the above-mentioned step 1 that any takes apparatus in also available CCD or CMOS camera, the scanner by the visual angle of setting three-dimensional body to be taken.

3, the method with generating synthetic hologram by digital microreflector according to claim 1 is characterized in that the n during above-mentioned step 2 1. is 60～200.