Single exposure 3-D object digital holography based on multi-filtering technique

WANG Liang; FENG Shao-tong; NIE Shou-ping; HUANG Fei

For improving the quality of the reconstructed image calculated from the hologram,a 3-D object digital hologram was successfully recorded by using single exposure method and 3-D object holographic optical setup based on Mach-Zehnder interferometer.The quality of the reconstructed image directly calculated from the recorded hologram was unsatisfactory because of the presence of the zero-order diffraction and the speckle noise.A set of digital image processing algorithms was then proposed to process the digital hologram and the reconstructed image with multi-filtering technique.The method synthetizing the wavelet filtering and the contracted weighted mean filtering is capable to eliminate the zero-order diffraction component and reduce the speckle noise to obtain realistic reconstructed image.The experimental result shows that this simple method is very effective for improving the quality of the reconstructed image.For recording hologram only once,it is convenient for application in the real time image processing fields.

Corresponding author: NIE Shou-ping, nieshouping@njnu.edu.cn;

1. Opto-electronic Technology Key Laboratory, Nanjing Normal University, Nanjing 210097, China

Received Date: 2006-06-09

Accepted Date: 2006-07-27

Available Online: 2007-08-25

Abstract: For improving the quality of the reconstructed image calculated from the hologram,a 3-D object digital hologram was successfully recorded by using single exposure method and 3-D object holographic optical setup based on Mach-Zehnder interferometer.The quality of the reconstructed image directly calculated from the recorded hologram was unsatisfactory because of the presence of the zero-order diffraction and the speckle noise.A set of digital image processing algorithms was then proposed to process the digital hologram and the reconstructed image with multi-filtering technique.The method synthetizing the wavelet filtering and the contracted weighted mean filtering is capable to eliminate the zero-order diffraction component and reduce the speckle noise to obtain realistic reconstructed image.The experimental result shows that this simple method is very effective for improving the quality of the reconstructed image.For recording hologram only once,it is convenient for application in the real time image processing fields.

HTML

Reference (8)

[1]	Chinese Mechanical Engineering Society.Welding manual:materialweling[M].Beijing:China Machine Press,1992.184(in Chinese).
[2]	LEI H D,XU B,YIN J.Study on the weldability of the quenched and tempered 30CrMnSiA with laser beam welding[J].Laser Technology,2002,26(3):225～228(in Chinese).
[3]	MATSUNAWA A,SETO N,JONG D K et al.Dynamics of keyhole and molten pool in high power CO2 laser welding[J].Proc SPIE,2000,3888:34～45.
[4]	TSUKAMOTO S,KAWAGUCHI I,ARAKANE G et al.Keyhole be-havior in high power laser welding[J].Proc SPIE,2002,4831:251～256.
[5]	MATSUNAWA A,KATAYAMA S.Understanding physical mech-anisms in laser welding for construction of mathematical model[J].Welding in the World,2002,46:27～38.
[6]	TSUKAMOTO S,KAWAGUCHI I,ARAKANE G et al.Suppression of porosity using pulsed modulation of laser power in 20kW CO2 laser welding[A].International Congress on Applications of Lasers & Electro-Optics[C].Orlando Florida:Laser Institute of America,2001,section C:1702.
[7]	KAWAGUCHI I,TSUKAMOTO S,HONDA H et al.Power modulation in deep penetration laser welding-optimization of frequency and waveform to prevent the porosity[A].International Congress on Applications of Lasers & Electro-Optics[C].Orlando Florida:Laser Institute of America,2003,section A:1006.
[8]	CHEN L,HU L J,GONG Sh L et al.Research on CO2 laser welding procedure of Ti3AlNb intermetallic compound[J].Welding & Joining,2004,12:10～13(in Chinese).

Single exposure 3-D object digital holography based on multi-filtering technique

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views