Method for acquiring colorful digital holographic image

A technology of digital holography and acquisition method, applied in the field of digital holography, can solve the problems of unclear boundaries and details of color digital holographic images, unable to ensure the accurate coincidence of numerical reproduced images, affecting the quality of color holographic reproduced images, etc., and achieve clear boundaries and details. The effect of simple structure, numerical reconstruction process, and simplified recording and reproduction process

Inactive Publication Date: 2009-06-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Claims
  • Application Information

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Problems solved by technology

B.Javidi and D.Alfieri et al. in their paper "Method for superposing reconstructed images from digital holograms of the same object recorded at different distance and wavelength" (Optics Communications 260 (2006), 113-116) and "Three-dimensional image fusion by use of multiwavelength digital holography" (Optics Letters 30 (2005), 144-146) adjusts different hologram recording conditions (recording wavelength and recording The display size of the digital hologram under the distance) is based on the combination of the obtained red and green monochrome holograms with the same display size to obtain a color d

Method used

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  • Method for acquiring colorful digital holographic image
  • Method for acquiring colorful digital holographic image
  • Method for acquiring colorful digital holographic image

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Experimental program
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Embodiment 1

[0031] The steps of Embodiment 1 are as follows: Step 1 is the recording process, and Steps 2 to 5 are the reproduction process.

[0032] (1) Use the black-and-white area array CCD and multi-wavelength lensless Fourier transform hologram recording optical path, and take the monochromatic digital hologram A of the recorded object under red, green and blue laser illumination respectively R , AG , A B ;

[0033] (2) For the collected monochrome digital hologram A R , A G , A B , according to the recording distance and recording wavelength, the zero-padding process is performed to obtain the corresponding zero-padding digital hologram B R , B G , B B ;

[0034] (3) For zero-padding digital hologram B R , B G , B B Perform median filter preprocessing respectively to obtain the corresponding median filter preprocessing hologram C R , C G , C B ;

[0035] (4) Preprocess hologram C with median filter R , C G , C B Perform inverse fast Fourier transform operations resp...

Embodiment 2

[0044] Embodiment 2: the difference of embodiment 1 is the 5th step of method step, the monochromatic digital holographic image that is used to synthesize color digital holographic image in embodiment 1 is this photographed by black-and-white type CCD at a certain recording distance place Numerical reconstruction image of the color digital hologram, the monochrome digital hologram used for synthesizing the color digital hologram in embodiment 2 is the numerical value of multiple digital holograms of the color taken by the black and white type CCD respectively at a plurality of different recording distances The superposition result of the reconstructed image, compared with the former, the speckle field on the numerically reconstructed image surface of the latter is well suppressed due to the smooth superposition, so a color digital hologram with higher quality can be synthesized by it.

[0045] Red light digital hologram A R The recording condition is λ 1 =632.8nm,D 11 = 45cm...

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Abstract

The invention relates to a method for acquiring a colorful digital holographic image. The method is technically characterized in that a black and white type area array CCD and multiple recording wavelength lens-free fourier transform hologram recording optical path are used for respectively shooting a single-color digital hologram of an object to be recorded under the irradiation of red, green and blue laser; after the zeroing treatment of the acquired single-color digital holograms is carried out to acquire the corresponding zeroed digital holograms, the median filtering pretreatment is respectively carried out to acquire the corresponding median filtering pretreatment holograms, then the inverse fast fourier transform operation is carried out, and the acquired red, green and blue single-color digital holograms are respectively inputted into a three-layer zero matrix to acquire a colorful digital holographic image of the object to be recorded. According to the method, the position of a reproduced image on a value reconstruction image plane is fixed by the distance between the recorded object on an object plane and a reference point light source during the recording and is not changed with the recording distance. In addition, the method has less constraint on the horizontal size of the object to be recorded and has a larger space-bandwidth product.

Description

technical field [0001] The invention relates to a method for acquiring a color digital hologram, belonging to the technical field of digital holography. It is a color digital holographic image acquisition method based on digital holography and lensless Fourier transform holography. Background technique [0002] The holographic recording and display of colored objects is an important aspect of the application of holographic technology. At present, the commonly used methods are traditional optical holography, such as rainbow holography, transmission true color holography, reflective true color holography, true color holography Synthetic holography, etc. ("Optical Holography and Its Applications", written by Yu Meiwen). Their implementation methods are relatively complicated. The main reasons are: firstly, the recording optical path of holograms is complex and difficult to build and adjust; secondly, chemical recording media such as dry plates cannot be reused, and the cost of...

Claims

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Application Information

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IPC IPC(8): G03H1/26G03H1/04G03H1/08G03H1/16
Inventor 赵建林姜宏振邸江磊
Owner NORTHWESTERN POLYTECHNICAL UNIV
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