CN104166336A - Spatial conversion method of three-dimensional holographic colors - Google Patents

Abstract

The invention discloses a spatial conversion method of three-dimensional holographic colors, and the method includes the steps of: S1. converting an RGB color space to an XYZ color space; specifically, using three lasers to emit laser beams which are red, green, and blue respectively and have corresponding wavelengths; determining coordinates of the XYZ color space obtained by conversion; and determining chromaticity diagram coordinates of three-primary colors emitted by the three lasers and white balance; S2. converting the XYZ color space to the RGB color space; specifically, obtaining the chromaticity diagram coordinates of three-primary colors emitted by the three lasers and white balance according to the step S1, and acquiring a conversion matrix of conversion to the RGB color space from the XYZ color space; and S3. according to the conversion matrix obtained by the step S2, restoring color information. The spatial conversion method of three-dimensional holographic colors in the invention greatly reduces influence of background light on chromatic aberration, conversion of color spaces are no longer limited in a standard RGB space, color information of an original object can be truly reproduced, and at the same time, laser can serve as primary colors of the background light, chroma and saturation of colors reproduced in the RGB space by equipment are enlarged.

Description

A kind of space conversion method of 3D hologram color

Technical field

The present invention relates to color synthesis technical field, more specifically relate to a kind of space conversion method of 3D hologram color.

Background technology

The research and development of color synthetic hologram record and display system, from rainbow holography to full parallax synthetic hologram, no matter be application separate unit or multi-station laser, synthesizing optical holography or calculation holographic, reproduce the original looks of reduction object that the color of picture all the time cannot be loyal, and this problem is never well solved, this difference becomes color synthetic hologram at the obstacle of the field application such as industrial design, amusement vision.

In color hologram, seminar's application multi-wavelength laser instrument of Wales, University of Wales northeast institute carrys out the information of recording holographic object, its color is for the holography regeneration picture of monochromatic wavelength record, on color, improve, but only by increasing the quantity of different wave length laser, improve the color of reproducing picture, limitation is very strong.

In the two dimensional display color rendering technology of Sony, there is similar techniques, but because its application white is white balance chromatic diagram coordinate, the record of inapplicable synthesizing optical holography.

Prior art, well reproducing color therewith information in a word.

Summary of the invention

(1) technical matters that will solve

The technical problem to be solved in the present invention is true online colouring information how.

(2) technical scheme

In order to solve the problems of the technologies described above, the invention provides a kind of space conversion method of 3D hologram color, comprise the following steps:

S1, RGB color space conversion are XYZ color space;

Be specially with three laser instruments and send respectively the laser beam that redness, green, blueness have respective wavelength;

Obtain the coordinate that is transformed into XYZ color space;

Obtain three primary colors that described three laser instruments send and the chromatic diagram coordinate of white balance;

S2, XYZ color space conversion are RGB color space;

Be specially according to described step S1 and obtain three primary colors that three laser instruments send and the chromatic diagram coordinate of white balance, try to achieve XYZ color space conversion to the transition matrix of RGB color space;

S3, the transition matrix obtaining according to described step S2, reduce color information.

Preferably, the wavelength of the red laser in described step S1 is 633nm; The wavelength of green laser is 532nm; The wavelength of blue laser is 473nm.

Preferably, described step S1 extracts light information according to ray tracing principle.

Preferably, utilize acousto-optic modulator as the switch of controlling described laser instrument.

Preferably, utilize the anaglyph information of spatial light modulator carrying three-dimensional body.

(3) beneficial effect

The invention provides a kind of space conversion method of 3D hologram color, greatly reduce the impact of bias light on aberration, the conversion of color space is no longer limited to standard rgb space, can reproduce really the colouring information of the original, can make laser light primary colors as a setting, expand chroma and the saturation degree of equipment rgb space reproducing colors simultaneously.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the system figure of the space conversion method of application a kind of 3D hologram color of the present invention.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail.Following examples are used for illustrating the present invention, but can not be used for limiting the scope of the invention.

The space conversion method of a kind of 3D hologram color of the present invention, comprises following two steps:

S1, RGB; Color space conversion is XYZ color space;

Be specially with three laser instruments and send respectively the laser beam that redness, green, blueness have respective wavelength;

According to RGB additive color mixing principle, define reconstruction of hologram color:

H _e(λ)=R′f _r(λ)+G′f _g(λ)+B′f _b(λ)+f _bg(λ) (1)

H _e(λ), f _r(λ), f _g(λ), f _b(λ) and f _bg(λ) represent respectively the maximal value of primary color spectra radiation intensity, and the spectral radiance of bias light, R ', G ', B ' represent the maximal value of primary color spectra radiation intensity, and bias light, R ', G ', B ' represent the related coefficient of LCD RGB passage.This model represents that primary colors reproduces the energy spectrum of the reconstruction of hologram of the RGB additive color mixing of spectrum.By reproducing the reproduction tone γ of synthetic hologram _k{ }, (k=r, g, b), R ', G ' and B ' can be written as respectively:

R′=γ _r{R} (2)

G′=γ _g{G} (3)

B′=γ _b{B} (4)

R, G and B are respectively the RGB passage numeral image input signals of LCD in register system.

$\left(\begin{array}{c}X\\ Y\\ Z\end{array}\right)=\left(\begin{array}{ccc}{X}_r& X_g& X_b\\ Y_r& Y_g& Y_b\\ Z_r& Z_g& Z_b\end{array}\right)\left(\begin{array}{c}{R}^{\′}\\ G^{\′}\\ B^{\′}\end{array}\right)+\left(\begin{array}{c}{X}_{\mathrm{bg}}\\ Y_{\mathrm{bg}}\\ Z_{\mathrm{bg}}\end{array}\right)---\left(5\right)$

Wherein

$\left(\begin{array}{c}{X}_k\\ Y_k\\ Z_k\end{array}\right)=\left(\begin{array}{c}\∫C_X\left(\mathrm{\λ}\right)f_k\left(\mathrm{\λ}\right)\mathrm{d\λ}\\ \∫C_Y\left(\mathrm{\λ}\right)f_k\left(\mathrm{\λ}\right)\mathrm{d\λ}\\ \∫C_Z\left(\mathrm{\λ}\right)f_k\left(\mathrm{\λ}\right)\mathrm{d\λ}\end{array}\right)---\left(6\right)$

Simultaneously k=r, g, b and bg.

The chromatic diagram coordinate of definition RGB primary colors and white balance.

$\left(\begin{array}{c}X\\ Y\\ Z\end{array}\right)=Y_w\left(\begin{array}{ccc}{x}_{r}r& x_{g}g& x_{b}b\\ y_{r}r& y_{g}g& y_{b}b\\ z_{r}r& z_{g}g& z_{b}b\end{array}\right)\left(\begin{array}{c}{R}^{\′}\\ G^{\′}\\ B^{\′}\end{array}\right)+\left(\begin{array}{c}{X}_{\mathrm{bg}}\\ Y_{\mathrm{bg}}\\ Z_{\mathrm{bg}}\end{array}\right)---\left(7\right)$

With

$\left(\begin{array}{c}r\\ g\\ b\end{array}\right)={\left(\begin{array}{ccc}{x}_r& x_g& x_b\\ y_r& y_g& y_b\\ z_r& z_g& z_b\end{array}\right)}^{-1}\left(\begin{array}{c}\frac{x_w}{y_w}\\ 1\\ \frac{z_w}{y_w}\end{array}\right)---\left(8\right)$

(x wherein _w, y _w, z _w), (x _r, y _r, z _r), (x _g, y _g, z _g), (x _b, y _b, z _b) represent the chromaticity coordinate of RGB reconstruction of hologram primary colors gray-scale map;

S2, XYZ color space conversion are RGB color space;

By the process of above-mentioned color space conversion, can obtain a matrix, be XYZ space to be transformed into the compute matrix M of RGB.

$\left(\begin{array}{c}{R}^{\′}\\ G^{\′}\\ B^{\′}\end{array}\right)=M\{\left(\begin{array}{c}X\\ Y\\ Z\end{array}\right)-\left(\begin{array}{c}{X}_{\mathrm{bg}}\\ Y_{\mathrm{bg}}\\ Z_{\mathrm{bg}}\end{array}\right)\}---\left(9\right)$

$M={\left(\begin{array}{ccc}{x}_{r}r& x_{g}g& x_{b}b\\ y_{r}r& y_{g}g& y_{b}b\\ z_{r}r& z_{g}g& z_{b}b\end{array}\right)}^{-1}---\left(10\right)$

R=γ _r ^-1{R′} (11)

G=γ _g ^-1{G} (12)

B=γ _b ^-1{B′} (13)

Apply this inverse of a matrix matrix and an one dimension look-up table, the colouring information of actual object is transformed in the rgb space of display device;

S3, the transition matrix obtaining according to described step S2, reduce color information.

Fig. 1 is the system figure of the space conversion method of application a kind of 3D hologram color of the present invention; In figure, the effect of each member is respectively, acousto-optic modulator 12: the switch of controlling laser beam; Polarization beam apparatus 11 is combined use with half-wave plate 10: beam splitter; The effect of lens 1 and object lens 2: laser beam is expanded into directional light; Random phase plate 7: increase random phase; LCD8: carrying two-dimension projection information; Lens 24: Fourier transform; Diaphragm 6: filter the high-frequency signal while as the object plane of object light; Holographic dry plate 13: recording interference fringe; X-y turntable 14: the shift position of controlling holographic dry plate; Lens 35: be converged to the effect of picture; Catoptron 1: reflection all band light beam; Single wavelength catoptron 9: the catoptron of reflection specific wavelength.

This system synthesis 3D hologram principle, according to the principle of ray tracing, extracts the light information of three-dimensional body institute scattering light information and makes the Hogel needed image that exposes; During reproduction, applying collimated white light irradiates.Apply red (He-Ne:633nm), green (DPSS:532nm), and blue (473nm) three look LASER Light Source, using liquid crystal display (LCD8) as optical spatial modulator, the information of carrying three-dimensional body, the acousto-optic modulator 12 of usining is controlled laser beam, the system of being carried out holographic automatic exposure by computer control as switch.Laser beam is divided into two-beam line by polarisation Amici prism, after the information of Ray Of Light by the three-dimensional body in carrying acousto-optic modulator, through fourier transform lens, focus on, imaging on the holographic dry plate of being controlled by x-y turntable, another light beam is reference light, two-beam is after the light-sensitive medium Surface Interference of holographic dry plate, interference fringe goes on record, and is moved on next exposure position afterwards by computer control turntable, exposes for the second time.By this system, utilize multiple-exposure, the mode of space dividing exposure and double exposure records the holography of reflection-type color solid and provides experimental data for analyzing synthetic 3D hologram color.

Through experiment, obtain the chromatic diagram coordinate of three primary colors and black, as shown in table 1:

Table 1

Data are by calculating a matrix M that is applicable to this system

$M=\left(\begin{array}{ccc}1.81& -0.41& -0.24\\ -0.69& 1.64& -0.02\\ 0.02& -0.05& 1.10\end{array}\right)$

This matrix can make RGB color space and XYZ color space mutually change.

Table 2 is value of chromatism under same illumination, wherein average color difference CIELAB Δ E=13.1.

Table 2

16.8	9.6	5.9	16.7	8.9	12.8
						16.6	4.3	10.1	13.7	22.7	31.6
8.4	16.1	17.3	30.2	14.3	12.0
						11.7	7.5	8.2	9.0	6.7	10.5

The space conversion method of a kind of 3D hologram color provided by the invention, greatly reduce the impact of bias light on aberration, the conversion of color space is no longer limited to standard rgb space, can reproduce really the colouring information of the original, can make laser light primary colors as a setting, expand chroma and the saturation degree of equipment rgb space reproducing colors simultaneously.

Above embodiment is only for the present invention is described, but not limitation of the present invention.Although the present invention is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is carried out to various combinations, revises or is equal to replacement, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of claim scope of the present invention.

Claims (5)

1. a space conversion method for 3D hologram color, is characterized in that, comprises the following steps:

S1, RGB color space conversion are XYZ color space;

Be specially with three laser instruments and send respectively the laser beam that redness, green, blueness have respective wavelength;

Obtain the coordinate that is transformed into XYZ color space;

Obtain three primary colors that described three laser instruments send and the chromatic diagram coordinate of white balance;

S2, XYZ color space conversion are RGB color space;

Be specially according to described step S1 and obtain three primary colors that three laser instruments send and the chromatic diagram coordinate of white balance, try to achieve XYZ color space conversion to the transition matrix of RGB color space;

S3, the transition matrix obtaining according to described step S2, reduce color information.

2. the space conversion method of a kind of 3D hologram color according to claim 1, is characterized in that, the wavelength of the red laser in described step S1 is 633nm; The wavelength of green laser is 532nm; The wavelength of blue laser is 473nm.

3. the space conversion method of a kind of 3D hologram color according to claim 1, is characterized in that, described step S1 extracts light information according to ray tracing principle.

4. the space conversion method of a kind of 3D hologram color according to claim 1, is characterized in that, utilizes acousto-optic modulator as the switch of controlling described laser instrument.

5. the space conversion method of a kind of 3D hologram color according to claim 1, is characterized in that, utilizes the anaglyph information of spatial light modulator carrying three-dimensional body.