A geometric model of surface motion measurement by objective speckle imaging

Heikkinen, Juuso; Schajer, G. S.

doi:10.1016/j.optlaseng.2019.105850

Cited by 10 publications

(2 citation statements)

References 16 publications

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“…Ref. [ 29 ] proposed a geometric method to explain the motion of speckle. Ncorr [ 20 ] is a digital correlation algorithm specially designed by researchers for two-dimensional images.…”

Section: Introductionmentioning

confidence: 99%

A Speech Enhancement Algorithm for Speech Reconstruction Based on Laser Speckle Images

Hao

Zhu

Wang

et al. 2022

Sensors

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In the optical system for reconstructing speech signals based on laser speckle images, the resonance between the sound source and nearby objects leads to frequency response problem, which seriously affects the accuracy of reconstructed speech. In this paper, we propose a speech enhancement algorithm to reduce the frequency response. The results show that after using the speech enhancement algorithm, the frequency spectrum correlation coefficient between the reconstructed sinusoidal signal and the original sinusoidal signal is improved by up to 82.45%, and the real speech signal is improved by up to 56.40%. This proves that the speech enhancement algorithm is a valuable tool for solving the frequency response problem and improving the accuracy of reconstructed speech.

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“…Ref. [ 29 ] proposed a geometric method to explain the motion of speckle. Ncorr [ 20 ] is a digital correlation algorithm specially designed by researchers for two-dimensional images.…”

Section: Introductionmentioning

confidence: 99%

A Speech Enhancement Algorithm for Speech Reconstruction Based on Laser Speckle Images

Hao

Zhu

Wang

et al. 2022

Sensors

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“…Three-dimensional modelling is the geometrical representation of an object inside the x, y, z planes (HWANG; KIM, 2013). Mathematical models are used to identify a specific model which best describes the form and dimensions of an object (HEIKKINEN;SCHAJER, 2020). The representation of objects through geometrical modelling have replaced with significant advantage real measurements, since it provides an analytical or mathematical description of the object being analyzed, moreover when the object has a complex shape to be reproduced by manual measurements.…”

Section: Introductionmentioning

confidence: 99%

3d Reconstruction System by Means of Unique Camera, Structured Light and Mathematical Models

Ribeiro¹,

Rivera²,

Barreto³

et al. 2023

Theor Appl Eng

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3D digital profiles are key information in many areas of knowledge, from medical to agricultural or industry. And in order to achieve reliable digitized surfaces we can have in hand techniques using laser, digital cameras, structured light associated to image processing tools. To choosethe best technique we face some challenges based on the application itself, but on the cost of equipment, on the robustness and on the computational cost and programming complexity. This work aimed to address a reliable, robust and accessible methodology using just one camera and a light projector to, with mathematical models, generate digital 3D surfaces. The mathematical model was designed using the geometry of the system (camera, projector and object) with additional routine to adjust the optimum values of the variables involved. We validated the proposed method with known objects and presented a 3D reconstruction of objects that are difficult to achieve manually, such as a callote and the back of human-being. The results showed that the mathematical model created conditions to provide reliable outcomes from a low cost devices (webcam and regular light projector) usage, with correction of warping caused by perspective.

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Perspective Compensation of 2D-DIC Measurements by Combination with Speckle Imaging

Heikkinen

Schajer

2021

Advancement of Optical Methods &Amp; Digital Image Correlation in Experimental Mechanics

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A geometric model of surface motion measurement by objective speckle imaging

Cited by 10 publications

References 16 publications

A Speech Enhancement Algorithm for Speech Reconstruction Based on Laser Speckle Images

A Speech Enhancement Algorithm for Speech Reconstruction Based on Laser Speckle Images

3d Reconstruction System by Means of Unique Camera, Structured Light and Mathematical Models

Perspective Compensation of 2D-DIC Measurements by Combination with Speckle Imaging

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