Improving 3D reconstruction accuracy in wavelet transform profilometry by reducing shadow effects

López-Torres, Claudia-Victoria; Salazar-Colores, Sebastián; Kells, Kevin; Pedraza-Ortega, Jesús-Carlos; Ramos-Arreguín, Juan Manuel

doi:10.1049/iet-ipr.2019.0854

Cited by 14 publications

(6 citation statements)

References 33 publications

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“…If the true match error is within 3 pixels, the keypoint pair is deemed to be the right match. (5) if N kp > 1 then (6) Split child node (7) else then (8) Store child node (9) else then (10) Store child node (11) else then (12) if N store > N set then (13) Store the point which has the largest response in each node (14) Figure 3. Its basic principle is to use the mathematical characteristics between the number of feature points in the same area of various shapes of the image to measure the distribution of feature points.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Image registration plays an important role in computer vision. Image registration is widely used in many aspects such as image matching [1][2][3][4][5][6][7], change detection [8,9], 3D reconstruction [10][11][12], guidance [13][14][15], mapping sciences [16][17][18][19][20][21], and mobile robot [22,23]. In general, image registration methods can be mainly divided into two kinds: gray-scale matching methods and feature-based matching methods.…”

Section: Introductionmentioning

confidence: 99%

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Homogenized ORB Algorithm Using Dynamic Threshold and Improved Quadtree

Xiao

2021

Mathematical Problems in Engineering

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The Oriented FAST and Rotated BRIEF (ORB) algorithm has the problem that the extracted feature points are overconcentrated or even overlapped, leading to information loss of local image features. A homogenized ORB algorithm using dynamic thresholds and improved quadtree method is proposed in this paper, named Quadtree ORB (QTORB). In the feature point extraction stage, a new dynamic local threshold calculation method is proposed to enhance the algorithm’s ability to extract feature points at homogeneous regions. Then, a quadtree method is improved and adopted to manage and optimize feature points to eliminate those excessively concentrated and overlapping feature points. Meanwhile, in the feature points optimization process, different quadtree depths are set at different image pyramid levels to prevent excessive splitting of the quadtree and increase calculation speed. In the feature point description stage, local gray difference value information is introduced to enhance the saliency of the feature description. Finally, the Hamming distance is used to match points and RANSAC is used to avoid mismatches. Two datasets, namely, the optical image dataset and SAR image dataset, are used in the experiment. The experimental result shows that, considering accuracy and real-time efficiency, the QTORB can effectively improve the distribution uniformity of feature points.

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Section: Experiments and Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Homogenized ORB Algorithm Using Dynamic Threshold and Improved Quadtree

Xiao

2021

Mathematical Problems in Engineering

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“…Reference [20] proposed an adaptive 3D reconstruction algorithm of light field based on array images. References [21,22] used wavelet to decompose the image twice to obtain the high-frequency component features of the object. In the virtual reality environment, the two features are fused to output the detection results of weak targets and small targets in complex background.…”

Section: Related Workmentioning

confidence: 99%

Illustration Art Based on Visual Communication in Digital Context

Yan-qi

2022

Mobile Information Systems

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With the rapid advancement of digital media technology in recent years, a digital context has emerged and developed under its influence. Visual communication relies heavily on illustration art. It is widely used in many fields of modern design because it is an important form of visual communication. We propose a visual communication design method for small and weak target images based on temporal and spatial filtering. We calculate the probability of gray pixels appearing using the histogram equalization method, assign thresholds to pixels, and enhance the gray value of images using the equalization process. We analyze the characteristics of each element of the 3D video system and the appropriate visual communication design form after performing calculations and combining them with the basic theory of visual communication design. Create system test links, test indicators, and test results. It has been demonstrated that the restored image integrity of the system is higher than that of the existing system, and that its performance is better.

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“…In projection correlation method, they are generally divided into Fringe Projection Profilometry (FPP) [17][18][19][20] and Speckle Projection Profilometry (SPP) [21][22] .SPP can calculate the out-of-plane displacement by using the common 2D-DIC method to track the highly modulated speckle, it's easy to implement.However, FPP has a complex phase unwrapping process.So SPP is simpler than FPP.In addition, SPP can calculate by only one reference image and one deformed image, which is more suitable for high-speed measurement. However, FPP method, such as phase shifting method [23][24][25] , requires at least three accurate phase shifting images, which greatly reduces the measurement speed.If we use the single fringe pattern FPP method such as Fourier Transform Profilometry(FTP) [26][27][28] and Wavelet Transform Profilometry(WTP) [29][30][31][32] , its accuracy will be lost. This paper combines SPP with 2D-DIC.Out-of-plane deformation is measured by SPP and in-plane deformation is measured by 2D-DIC.In order to perfectly separate the projected speckle and the speckle attached to the surface of the specimen,Fluorescence Digital Image Correlation (FDIC) method is introduced to replace the traditional DIC method.FDIC method was first proposed by berfield [33] for nano scale deformation measurement.…”

mentioning

confidence: 99%

Simultaneous in-and-out-of-plane deformation measurements using speckle projection and fluorescent digital image correlation

zhongda

Sun

Zhao

2023

Conference on Infrared, Millimeter, Terahertz Waves and Applications (IMT2022)

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A new method for measuring in-and-out-of-plane deformation using a single 3CCD color camera is proposed.First, print a layer of black primer on the surface of the tested object.Then use the spray gun to make red fluorescence on the surface of the tested object.Finally, use the projector to project the computer-generated blue speckle pattern with black primer onto the surface of the tested object, and capture the reference pattern and the deformed pattern with a color camera at the same time.This method uses three independent red-green-blue chips on the 3CCD color camera sensor to separate the captured patterns,the in-plane deformation is measured by Fluorescent Digital Image Correlation (FDIC), and the out-of-plane deformation is measured by Speckle Projection Profilometry(SPP).Compared with the traditional 3-Dimensional Digital Image Correlation(3D-DIC), this method only uses one color image to contain in-and-out-of-plane deformation information , and does not need complex stereo calibration, which greatly reduces calculation workload.Experimental results of step rigid body translation、 disc center loading and free end loading of cantilever beam demonstrate that the proposed technique is easy to implement and can be applied to practical in-and-out-of-plane deformation measurement with high accuracy in engineering field.

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Improving 3D reconstruction accuracy in wavelet transform profilometry by reducing shadow effects

Cited by 14 publications

References 33 publications

Homogenized ORB Algorithm Using Dynamic Threshold and Improved Quadtree

Homogenized ORB Algorithm Using Dynamic Threshold and Improved Quadtree

Illustration Art Based on Visual Communication in Digital Context

Simultaneous in-and-out-of-plane deformation measurements using speckle projection and fluorescent digital image correlation

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