Lu-Rong Guo’s research while affiliated with Sichuan University and other places

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Publications (7)


Optical geometry of the experimental arrangement.
Schematic diagram of the structured light module.
Optical geometry of the projector: (a) front view in the longitudinal section and (b) top view in the horizontal section.
Schematic diagram of the complete system.
View of the reconstructed 360° shape of the cone–cylinder.

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Automated measurement method for 360° profilometry of 3-D diffuse objects
  • Article
  • Publisher preview available

April 1991

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33 Reads

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58 Citations

Xiao-Xue Cheng

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Lu-Rong Guo

An automated measurement method for 360° surface topography of 3-D diffuse objects is presented. The method is based on the simple principle of triangulation with structured illumination. The geometric specifications of the structured light module used in the system are analyzed on a computer. Using an advantageous data acquisition schedule, high data acquisition rates and measuring accuracy can be achieved. The system comprises a structured lighting projector, a 2-D detector array, and a microcomputer for control and processing. Experimental results for 3-D objects are offered.

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Improved Fourier transform profilometry

January 1988

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55 Reads

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32 Citations

Proceedings of SPIE - The International Society for Optical Engineering

An improved Fourier transform profilometry for the automatic mesurement of 3-D object shapes is presented. Because of using a defocused Rouchi grating to get a qusi-sinusoidal optical field and using grating π-phase shifting technique, the fundarmental spectrum modulated by 3-D object shapes can be extended from 0 to 2f. theorily Cf. is the carrier frequency of the optical field). Consequently,the measurable rate of hight variation can be extended three times more than the unimproved FTP. This article gives the theory and experiment results of the improved FTP.


Binary Synthetic Phase-Only Filter (BSPOF) With Random Mask

October 1987

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3 Reads

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1 Citation

Proceedings of SPIE - The International Society for Optical Engineering

It has been shown that synthetic phase-only filter formed by using different plane wave carriers may provide very high optical efficiency and can produce very sharp correlation peaks in the case of multiobjects correlation recognition. Binarizing the synthetic phase-only filter (SPOF) would make filter making much more easy. But binary synthetic phase-only filter (BSPOF) would produce undesirable noise which mainly consists of convolution-like peaks in the output plane. These noise peaks may sometime rise very high especially when objects are symmetrical. In this paper a random phase mask placed close to the BSPOF in the Fourier plane is used in the correlation system. It can spread the energy of the noise peaks in the output plane. So that, there is no any obvious noise peaks presented, however, at the same time, the sharp correlation-like peaks of SPOF are remained very well. The computer simulation results are given. The comparison of the correlation outputs of BSPOF with that of SPOF is discussed. And 3-D plots of correlation output are presented.


PHASE-ONLY COMPOSITE FILTER.

June 1987

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5 Reads

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8 Citations

Combining the concepts of phase-only filtering and multiple-exposure holography, we propose a method for making a phase-only composite filter using a plane reference wave as the carrier. We used this filter for the optical recognition of four kinds of hardware items, and the results of a computer simulation are presented. The characteristics and possible applications of this correlation recognition method are discussed.


The SDF Method In Optical Power Spectrum Recognition

January 1987

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7 Reads

Proceedings of SPIE - The International Society for Optical Engineering

Filtering by synthetic discriminant function (SDF) is an effective method to achieve distortion invariant optical pattern recognition(1). In this paper, the fundamental algorithm of SDF is applied to optical power spectrum recognition and classification in optical frequency spectrum analytical system, and an optical implementation of SDF method for the classification is presented and rather good results are obtained.


Four-Dimensional Chromaticity For Distinguishing Efficiently Metamerism

January 1987

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3 Reads

Proceedings of SPIE - The International Society for Optical Engineering

In the measurement of color, such as interference colors of birefringent crystal and color of the pseudocolor encoded output image(1),metamerism is a very widespread phenomenon, which influences directly practical applications of the meauement"and discrimination of color. In this paper, in order to research a one-to-one relation between color and object to be recognized, a 4-D generalized chromaticity space is presented and "the machine color" of birefringent crystal is measured and calculated. The results show that the metamerism can be distinguished efficiently by this method, which would be of significance in real-time automatic color discrimination.


A Synthetic Phase-Only Holographic Filter For Multiobject Recognition

January 1986

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5 Reads

Proceedings of SPIE - The International Society for Optical Engineering

Combining phase-only filtering with the idea of multiple exposure hologram, we propose a method to make a phase-only synthetic filter for multiobject recognition. When the filter is used in an optical correlation, several correlation responses appear on the output plane. According to the height of the correlation peak, we can easily recognize each of the multiobjects. The results of computer simulation are presented. The characteristic and application prospects of this correlation recognition method are discussed.

Citations (3)


... To solve the problem of the calibration imprecision caused by the coordinate extraction errors of the feature points, our approach takes advantage of the high precision of the phase-shifting fringes extraction [16][17][18] and uses the phase-shifting concentric circle grating and the phase-shifting wedge grating as the target to get the wrapped phase of the captured image and then gain the accurate coordinates of the feature points of zero-phase points [19]. We used the circle's center coordinates and the coordinates of all feature points to get the vanishing points on the basis of the cross-ratio invariance. ...

Reference:

Using concentric circles and wedge grating for camera calibration
PHASE-ONLY COMPOSITE FILTER.
  • Citing Article
  • June 1987

... Optical three-dimensional (3D) measuring methods based on structured light projection are widely used in many fields, such as industry, agriculture, and medicine, for their advantages of non-contact, high speed, high accuracy, and easy automation. [1][2][3][4][5] Fourier transform profilometry (FTP) [6][7][8] and phase measuring profilometry (PMP) 9,10 are two typical methods among them. FTP was first proposed by Takeda. ...

Improved Fourier transform profilometry
  • Citing Article
  • January 1988

Proceedings of SPIE - The International Society for Optical Engineering

... The development of structured light technology occurred slightly after LIDAR, originating around the 1970s [74][75][76][77][78], but from the beginning, it has received a lot of attention from researchers around the world. Various breakthroughs in structured light technology have been described in detail [16], and this study focuses on the development of this technology in the field of dentistry. ...

Automated measurement method for 360° profilometry of 3-D diffuse objects