Showing papers in "Optics and Lasers in Engineering in 2014"

TL;DR: A novel image encryption algorithm based on a hybrid model of deoxyribonucleic acid (DNA) masking, a genetic algorithm (GA) and a logistic map is proposed that demonstrates excellent encryption and resists various typical attacks.

TL;DR: The aim of this publication is to provide an extensive review of existing intraoral scanners for restorative dentistry evaluating their working principles, features and performances.

TL;DR: Experimental results show that the first technique can effectively improve the measurement accuracy of diffuse objects with LRR, the second one is capable of measuring object with weak specular reflection (WSR: e.g. shiny plastic surface) and the third can inspect surface with strong specular reflections precisely.

TL;DR: This paper will summarize the recent work on the following three major areas: realization of kHz 3D shape measurement with binary phase-shifting methods; binary pattern improvement with pulse width modulation and binary dithering/halftoning techniques; and applications of superfast 3Dshape measurement techniques.

TL;DR: In this paper, a review of the application of biospeckle to agriculture is presented, focusing on three aspects: on image analysis and mathematical methods for biospecker activity evaluation, on published applications to botanical samples, with special attention to agricultural crops, and on interpretation of the phenomena from a biological point of view.

TL;DR: The proposed ASR-EFEMD technique has been tested using simulated and experimental data including complex closed fringe patterns with wide spatial frequency range and its superiority over the SR-FABEMD-HS as well as its robustness to fringe pattern noise, background illumination and modulation defects have been corroborated.

TL;DR: This paper proposes a robot navigation system which works using a high accuracy localization scheme by dynamic triangulation by integrating two principal systems, 3D laser scanning technical vision system (TVS) and mobile robot (MR) navigation system.

TL;DR: In this article, a 30 W MOPA Q-switched pulsed Yb:YAG fiber laser was used for cutting CFRP thin sheets using a galvanometric mirror system.

TL;DR: The experiments results show that the proposed algorithm based on the fractional Fourier transform (FRFT) is very robust to JPEG compression noise attacks and image manipulation operations, but also can provide protection even under compound attacks.

TL;DR: In this paper, an analyte-filled core self-calibration microstructured optical fiber plasmonic refractive index sensor was proposed for simultaneous detection in different ranges of wavelength because the sensing performance of the sensor in different wavelength ranges is relatively high.

TL;DR: The presented work evaluates the steps to be followed before accomplishing 5 axis laser cladding operations and the optimization of process parameter and strategies represents a useful tool for the industrial application of 5 axis Laser cladding.

TL;DR: In this article, laser surface alloying with boron and carbon was applied to produce the composite layers, reinforced by the hard ceramic phases (titanium borides and titanium carbides), on commercially pure titanium.

TL;DR: A novel subpixel registration algorithm withGaussian windows to implicitly optimize the subset sizes by adjusting the shape of Gaussian windows in a self-adaptive fashion with the aid of a so-called weighted zero-normalized sum-of-squared difference correlation criterion is proposed.

TL;DR: In this paper, the effects of laser peening with different coverage rates on residual stresses and fatigue crack growth (FCG) properties of Ti-6Al-4V titanium alloy were investigated.

TL;DR: In this article, an efficient approach to develop large-range liquid level sensors based on an extrinsic Fabry-Perot optical fiber interferometer with an all fused-silica structure and CO 2 laser heating fusion bonding technology was proposed.

TL;DR: In this paper, a hexagonal arrangement of laser pulses with various pulse overlaps and pulse energies was used to generate high friction textures, which have applications in large engines to reduce the tightening forces required for a joint or to secure precision fittings easily.

TL;DR: A new and accurate calibration method for calibrating a telecentric stereo micro-vision system with limited field of view is proposed and the problem of sign ambiguity induced by the planar-object-based calibration technique is successfully solved.

TL;DR: In this article, a novel humidity sensor based on an in-fiber Mach-Zehnder interferometer (MZI) is proposed and demonstrated, which has a linear response to humidity with enhanced sensitivity of −0119-dB/%RH in the range of 35-90%RH.

TL;DR: A systematic uncertainty assessment of DIC method in general dynamic applications and results show good agreement between the experiments and the simulations, proving the introduced technique to be an effective method for motion induced uncertainty estimation.

TL;DR: Not only the initial values of the logistic maps used in the cryptosystem but also the phase distribution produced in the encryption process can be used as private keys, which makes the proposed scheme has the characteristic of asymmetric encryption technique.

TL;DR: A multiscale framework for ultrasound image segmentation based on speckle reducing anisotropic diffusion and geodesic active contours and its potential for practical applications in other imaging modalities is indicated.

TL;DR: A fast and high dynamic range digital fringe projection technique is proposed to achieve fast and effective 3D measurement of shiny workpieces with dense point clouds and it improves the speed of 3D precise measurement of Shiny surface.

TL;DR: In this paper, a combination of fringe projection and two-dimensional digital image correlation (2D-DIC) has been proposed as an alternative method to obtain displacement maps in the three spatial directions.

TL;DR: This paper has proposed a first approach for an RGB image encryption and decryption using two stage random matrix affine cipher associated with discrete wavelet transformation and formulated a formula for all the possible range to choose keys for encrypting and decrypting anRGB image.

TL;DR: The peak signal-to-noise is used to evaluate the quality of the decrypted image, which shows that the encryption capacity of the proposed scheme is enhanced considerably and has high security against various attacks, such as chosen plaintext attack.

TL;DR: This paper presents a novel method to construct binary patterns for high-quality 3D shape measurement that can achieve substantial phase quality improvements over the dithering techniques for different amounts of defocusing.

TL;DR: In this article, the experimental characterization of polymer-matrix and polymer-based carbon fiber reinforced composite laminate by employing a whole field non-contact digital image correlation (DIC) technique is presented.

TL;DR: A novel 3D fingerprint imaging system is presented based on fringe projection technique to obtain 3D features and the corresponding color texture information and the experimental results demonstrate the feasibility of the proposed 3D fingerprints imaging system.

TL;DR: An improved phase unwrapping algorithm that can unwrap the phase more rapidly and accurately than most previous methods, especially for large grid phase Unwrapping and where compulational cost is high is proposed.

TL;DR: In this paper, the effect of surface oxide layer existing at the lap-joint faying surface of magnesium sheets is investigated on the keyhole dynamics of the weld pool and weld bead qualities.