Yingjie Yu

Shanghai University, Shanghai, Shanghai Shi, China

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Publications (36)26.95 Total impact

  • Hongyue Gao, Yingjie Yu, Huadong Zheng
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    ABSTRACT: Based on a super fast-response liquid crystal film, we have realized real-time holographic video display. This paper will focus on the improvement of holographic display of this film, and our achievement is useful for its potential applications in a highdefinition, large-size, and color holographic three-dimensional display.
    SID Symposium Digest of Technical Papers. 06/2014; 45(1).
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    ABSTRACT: The object-adaptive fringe projection technique employs user-defined uneven spaced fringe patterns, instead of the evenly spaced fringe patterns, to measure the deformation of the object surface. With this technique, the quality of the object-adaptive fringe patterns is very important for guaranteeing the measurement accuracy. In this paper, a simple and effective method to generate such fringe patterns based on the cubic Beziér interpolation is presented. It can realize the cubic Beziér interpolation through three nearest points and thereby the time required for generating the adaptive fringe patterns is significantly reduced without loss of accuracy. Numerical simulations and experiments have demonstrated the accuracy and effectiveness of the proposed method.
    Optics and Lasers in Engineering 01/2014; · 1.92 Impact Factor
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    ABSTRACT: The removal of misalignment aberrations is a key problem in the null test of cylindrical surfaces. Although the quadratic polynomial with two variables and the orthogonal Chebyshev polynomials have been used to separate the misalignment aberrations from the extracted phase data, there is no physical meaning corresponding to the polynomials coefficients. Additionally, the Runge phenomenon may occur when the high-order polynomials are employed. In this paper, all the possible aberrations caused by the adjustment errors were analyzed. Based on the first-order approximate principle, the mathematical models, which describe the relationship between the misalignment aberrations and the possible adjustment errors, were deduced. With these mathematical expressions, all the possible adjustment errors can be estimated by using the least-squares fitting algorithm, and then the genuine surface deviations can be obtained by subtracting the misalignment aberrations from the extracted phase data. Computer simulations and experiments have been conducted to demonstrate the validity and feasibility, which show more than 96% misalignment aberrations can be removed. Compared with the existing methods, the proposed model provides a feasible way to estimate adjustment errors with better accuracy.
    Applied Optics 10/2013; 52(30):7311-23. · 1.69 Impact Factor
  • Source
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    ABSTRACT: Several existing strategies for estimating the axial intensity derivative in the transport-of-intensity equation (TIE) from multiple intensity measurements have been unified by the Savitzky-Golay differentiation filter - an equivalent convolution solution for differentiation estimation by least-squares polynomial fitting. The different viewpoint from the digital filter in signal processing not only provides great insight into the behaviors, the shortcomings, and the performance of these existing intensity derivative estimation algorithms, but more important, it also suggests a new way of improving solution strategies by extending the applications of Savitzky-Golay differentiation filter in TIE. Two novel methods for phase retrieval based on TIE are presented - the first by introducing adaptive-degree strategy in spatial domain and the second by selecting optimal spatial frequencies in Fourier domain. Numerical simulations and experiments verify that the second method outperforms the existing methods significantly, showing reliable retrieved phase with both overall contrast and fine phase variations well preserved.
    Optics Express 03/2013; 21(5):5346-5362. · 3.55 Impact Factor
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    ABSTRACT: A computational method based on pure-phase look-up-table (LUT) is proposed for generating kinoforms of full-color real-existing three-dimensional (3D) objects. The principle of the pure-phase LUT method is described. 3D depth as well as color information of a full-color 3D object is obtained by the full-color 3D profile measurement approach based on binocular vision. The obtained full-color 3D data is decomposed into red (R), green (G), and blue (B) channels, and kinoforms of each channel are calculated from the depth map and color information of the corresponding channel using the pure-phase LUT method. In order to reduce the speckle noise of reconstructed full-color 3D image, sequential kinoforms of each color channel are generated by adding dynamic-pseudorandom phase factor into the object domain. Numerical reconstruction and optical reconstruction with a phase-only spatial light modulator (SLM) show that, with the proposed method, full-color holographic D display of real-existing full-color 3D objects is available.
    Optics and Lasers in Engineering 04/2012; · 1.92 Impact Factor
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    ABSTRACT: A Fraunhofer computer-generated hologram (CGH) is proved to be valid in display for three-dimensional (3D) objects from the Fresnel to the far-field region without a Fourier lens for reconstruction. To quickly compute large and complicated 3D objects that consist of slanted diffused surfaces in the Fresnel region, a Fraunhofer-based analytical approach using a basic-triangle tiling diffuser is developed. Both theoretical and experimental results reveal that Fraunhofer CGH can perform the same effects as Fresnel CGH but require less calculation time. Impressive 3D solid effects are achieved in the Fresnel region.
    Optics Letters 06/2011; 36(11):2128-30. · 3.39 Impact Factor
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    ABSTRACT: We propose a computational method for generating sequential kinoforms of real-existing full-color threedimensional (3D) objects and realizing high-quality 3D imaging. The depth map and color information are obtained using non-contact full-color 3D measurement system based on binocular vision. The obtained full-color 3D data are decomposed into multiple slices with RGB channels. Sequential kinoforms of each channel are calculated and reconstructed using a Fresnel-diffraction-based algorithm called the dynamicpseudorandom-phase tomographic computer holography (DPP-TCH). Color dispersion introduced by different wavelengths is well compensated by zero-padding operation in the red and green channels of object slices. Numerical reconstruction results show that the speckle noise and color-dispersion are well suppressed and that high-quality full-color holographic 3D imaging is feasible. The method is useful for improving the 3D image quality in holographic displays with pixelated phase-type spatial light modulators (SLMs).
    Chinese Optics Letters 04/2011; 9(4):040901. · 0.97 Impact Factor
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    ABSTRACT: The application of a single cube beam splitter (SCBS) microscope to micro-optics characterization is presented. The SCBS in the optical path, with a small angle between the optical axis and its central semireflecting layer, not only gives off-axis digital holograms but also provides dual-channel imaging. It is a unique and easy way to perform uniformity inspection across the entire microlens array. Experimental results on physical spherical phase compensation, single lens characterization, dual-channel imaging, and uniformity inspection are provided to demonstrate the unique properties of SCBS microscopy.
    Applied Optics 02/2011; 50(6):886-90. · 1.69 Impact Factor
  • Tao Wang, Yingjie Yu, Huadong Zheng
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    ABSTRACT: Hologram, as a type of diffractive optical element, is sensitive to wavelength in the process of optoelectronic reconstruction. Due to the different wavelengths of three prime colors used in full color holographic projections, there are chromatisms which badly spoil the reconstructed image. The chromatisms are composed of transverse and longitudinal chromatisms. For a computer generated hologram, transverse chromatism can be compensated by resampling the object information. However, it becomes more complex for longitudinal chromatism. This paper analyzes how the image is reconstructed from the phase-type hologram in a holographic projection system and the causations of longitudinal chromatism. To remove it, this paper proposes loading a specially designed phase distribution on a phase-type hologram. The advantage of this method is that it can be achieved by computer calculation and without adding any hardware such as achromatic optical element. A time-sharing system for a full-color hologram projection is developed in this paper. Comparisons have been made between the reconstructed images with and without chromatism. The experimental result shows that the method is effective in removing longitudinal chromatism and the quality of the reconstructed image is improved.
    Optical Engineering 01/2011; 50. · 0.88 Impact Factor
  • Tao Wang, Yingjie Yu, Huadong Zheng
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    ABSTRACT: To form a laser image, there usually are two kinds of image forming methods. One is to direct slender laser beams to special points by light directing element (LDE). The other one is light blocking method where amplitude spatial light modulator (SLM) used to form laser image. The former method has high light efficiency for none light is blocked, however precision mechanical instrument used as LDE is needed. In this paper, we describe a new kind of laser imaging method based on computational holography. Coherent light is used as source and phase SLM as LDE. The function of phase SLM is to change the phase of light illuminated on it. The light on the pixel will travel in new direction according to the phase change. Iterative Fourier Transform Algorithm (IFTA), also known as G-S algorithm, is used to find phase change value of each pixel. The process of laser image forming is simulated with VirtualLab™ and optical system is built to form the laser image. 2D and 3D image can be formed by the proposed method and they enjoy the advantages of laser display, such as full color gamut and sharp intensity.
    Proc SPIE 11/2010;
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    ABSTRACT: This paper presents a novel approach to generate object-adapted fringe, which based on scattered data interpolation. It can effectively solve the problems of the existing methods, such as complicated computation process and low accuracy. It needn't map the projector pixels coordinate onto the camera coordinate, only map the camera pixels coordinate onto projector coordinate. The phase of integer pixels of projector coordinate can be interpolated in the term of phase distribution of wanted fringe pattern. Compared to the presently algorithms, the advantages of this algorithm are simple and highly efficiency. This paper expatiates on the principle of the object-adapted fringe generation method using scattered data points. Simulation analysis and experiment results prove the validity and feasibility of the new approach. We also have compared the result between this new approach and other existing methods.
    Proc SPIE 04/2010;
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    ABSTRACT: Micro optics characterization by use of digital holographic microscopy (DHM) is proposed recently. DHM can provide phase image and very suitable for the quantitative mapping of transmission material with a certain refractive index. However, it has been found that in DHM the microscope objective introduces a spherical phase curvature to the object wave which may disturb the measurement especially for the micro-lens array. We present single lens characterization and uniformity inspection of micro-lens array by use of a new concept DHM system developed recently. The new concept DHM is based on a single cube beam-splitter (SCBS) configuration using an MO to provide high resolution on the test specimen. The SCBS is put into the optical path with a small angle between the optical axis and its central semireflecting layer. In this way, light is split into two parts when in and combined to form two holograms when out of SCBS. For the symmetrical configuration of the beam splitter cube, the spherical phase curvature introduced by the MO can be physically compensated during interference. Because no separated light propagation outside the SCBS, the whole system is insensitive to vibration. As light coming out of the MO serves not only the object beam but also the reference beam, it enables the inspection of the uniformity across a whole micro-lens array. Geometrical characterisation of the shape and surface roughness of micro-lens is given as well as the uniformity analysis across the whole array.
    Proc SPIE 04/2010;
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    ABSTRACT: This paper looks at some as yet undisclosed observations in the recording and reconstruction of digital Gabor hologram. Small particles on the specimen plane diffract the illuminating spherical wave to form the object wave which interferes with the un-diffracted reference to form the in-line hologram. The interference is similar to that between two spherical wavefronts. It is shown that resolution enhancement can be achieved in the recording process through the use of wavefronts with different curvature. Numerical reconstruction of this hologram with a conjugate of the illuminating (reference) wave provides the in-focus real image at the object plane. It is exemplified that the proper choice of the reconstruction wavefront can optically magnify the reconstructed image enabling one to better visualize the resolution enhancement. Both theoretical analysis and experimental confirmation are provided for these observations.
    Optik - International Journal for Light and Electron Optics 01/2010; 121(23):2179-2184. · 0.52 Impact Factor
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    ABSTRACT: Infrared digital in-line microscopic holography is achieved using a superlumiescent light emitting diode broadband source at 1310nm. It can be applied for the inspection of bulk material defects as well as some surface defects in silicon wafer. The imaging of a calibrated positive USAF target is used for the demonstration of the resolution improvement. Two pieces of semiconductor silicon wafer each with a slot 10mum in width are placed perpendicular with a 4mm gap to demonstrate the D imaging from a single hologram.
    Proc SPIE 12/2009;
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    ABSTRACT: In the process of optoelectronic reconstruction of color holograms, the reconstructed images of three colors can't be overlap properly because transverse dispersion caused by different wavelengths of three laser beams of R, G, B colors. In this paper, a novel method is proposed to compress or expand the number of discrete pixels of three component color images for eliminating transverse dispersion in the process of computing holograms. Holograms computed by the iterative Fourier transverse algorithm (IFTA) were loaded on reflective liquid crystal spatial light modulator (LC-SLM) for optoelectronic reconstruction. The experimental result shows that the method is effective.
    Proc SPIE 12/2009;
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    ABSTRACT: In order to realize holographic display of three-dimensional (3D) objects and suppress zero-order light, conjugate image, and speckle noise, a novel method is proposed based on multiple fractional Fourier transform (M-FrFT) for calculating holograms of 3D objects. A series of kinoforms are generated by adding pseudorandom phase factor (PPF) to object planes in calculating each kinoform, and generating the PPF randomly again in the next kinoform calculation. The reconstructed images from kinoform sequence are superposed together in order to suppress the speckle noise of reconstructed image and improve the contrast and detail resolution of the reconstructed images. The qualities of reconstructed images from single amplitude hologram, single kinoform, and kinoform sequence calculated by M-FrFT are compared. The effects of suppressing speckle noise are analyzed by calculating the speckle index of numerical reconstructed images. The analytical results illustrate that, with the proposed method for 3D holographic display, the zero-order light, conjugate image, and speckle noise can be suppressed, and the qualities of reconstructed images can be improved significantly.
    Chinese Optics Letters 11/2009; 7(12):1151-1154. · 0.97 Impact Factor
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    ABSTRACT: A new optical configuration for digital holographic microscopy is presented. Digital off-axis holograms are recorded by use of a single cube beam splitter in a nonconventional configuration to both split and combine a diverging spherical wavefront as it emerges from a single point source. Both the amplitude and the phase can then be reconstructed, yielding intensity and phase images with improved resolution. The novelty of the proposed configuration is its simplicity, minimal number of optical elements, insensitivity to vibration, and its inherent capability to compensate for the phase curvature that results from the illuminating wavefront in the case of microscopic samples.
    Applied Optics 06/2009; 48(15):2778-83. · 1.69 Impact Factor
  • Wenjing Zhou, Yingjie Yu, Anand Asundi
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    ABSTRACT: This paper discusses methods to eliminate and/or suppress aberrations in digital micro-holography (DMH) with specific examples for post-magnification DMH and lens-less DMH along with a phase subtraction approach. In post-magnification DMH, the reference wave interferes with the object wave to form a hologram, which is then magnified by a microscope objective (MO) and recorded by CCD. This compensates for the quadratic phase error usually present in the pre-magnification DMH and also it is easier to isolate the useful information in pre-processing. In this paper differences between post-magnification and pre-magnification DMH are compared and analyzed with the specimen of a phase grating with period 30 lines/mm and height 0.3 μm. A lens-less DMH is also described that can eliminate the quadratic error and most of wave-front errors of the projecting light. Finally, a phase subtraction method is demonstrated which can eliminate most of the system aberrations.
    Optics and Lasers in Engineering 01/2009; · 1.92 Impact Factor
  • Huadong Zheng, Yingjie Yu, Cuixia Dai
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    ABSTRACT: A novel holographic display system is proposed in this paper. The system takes LC-R2500, a kind of reflective liquid crystal spatial light modulator, (LC-SLM) as the core display unit, which can meet the requirement of real-time reconstruction of three-dimensional (3D) objects from holograms in free space. The relationship between hologram recording and image reconstruction is discussed, and the parameters associated with the magnification of reconstructed image over original object are determined. Experimental results of holographic display using the system are also given in the end.
    Optik - International Journal for Light and Electron Optics 01/2009; · 0.52 Impact Factor
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    ABSTRACT: A digital phase-shifting in-line holographic system based on the single coherence beam is developed. A series of phase-shifting fringes are generated by computer and outputted by a digital micro-mirror device (DMD). These fringes modulate the coherence beam because of the intensity modulation ability of DMD. In this work, the reconstructed conjugate image would not appear because of applying the phase-shifting algorithm. And calibration for the value of the optical phase shift is not necessary. An experiment based on a lens-less digital in-line micro-holographic setup with a phase grating specimen is conducted to demonstrate the validity of the present method.
    Optics and Lasers in Engineering 01/2009; · 1.92 Impact Factor

Publication Stats

63 Citations
26.95 Total Impact Points

Institutions

  • 2005–2013
    • Shanghai University
      • Department of Precision Mechanical Engineering
      Shanghai, Shanghai Shi, China
  • 2011
    • Sun Yat-Sen University
      • State Key Laboratory of Optoelectronic Materials and Technologies
      Guangzhou, Guangdong Sheng, China
    • Ngee Ann Polytechnic
      Tumasik, Singapore
  • 2009
    • Nanyang Technological University
      • School of Mechanical and Aerospace Engineering (MAE)
      Singapore, Singapore