Automated phase-measuring profilometry: a phase mapping approach

Srinivasan, V.; Liu, Hsin-Chu; Halioua, Maurice

doi:10.1364/ao.24.000185

Cited by 188 publications

(66 citation statements)

References 8 publications

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“…Profilometry, for being a powerful tool in the determination of forms and surfaces, allows the classification and evaluation of materials with distinct forms and behaviors (Srinivasan et al, 1985). Among various techniques for the construction of profilometry, the Moiré technique can be considered as a theoretical basis for many methods and digitalization equipment (Sciammarella, 1982;Braga et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Costa

Ribeiro

Braga

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe macaw palm crop has been studied because of its bioenergy potential due to the high oil yield, which is linked to fruit maturity stage. Digital images have been adopted as a contactless way to obtain information about fruit surface area and volume, acting as a sensor for quality control and the classification of fruits, based on physical aspects during the maturation stage. The aim of this study was to estimate the volume of macaw palm fruits from digital models obtained by the Moiré technique using only one camera, associated with digital imageprocessing tools to unwarp the images, allowing the comparison with conventional methods. The volumes obtained by the Moiré technique were compared with those obtained by water displacement method (WDM) and millet-seed displacement method (SDM). The results show that the volumes measured by the Moiré technique exhibited a mean error of 13.54% compared with the SDM, and 11.09% when compared to WDM, which indicates that the digital Moiré technique is a robust, low-cost tool to measure the volume of macaw palm fruits.Mensuração do volume do fruto de macaúba por meio das técnicas convencionais e pela técnica digital de Moiré R E S U M OA cultura da macaúba vem sendo estudada devido ao seu potencial bioenergético propiciado pela alta produtividade de óleo que, por sua vez, está associado ao estádio de maturação do fruto. Imagens digitais têm sido utilizadas como forma para extrair informações sem contato sobre a área superficial e volume de frutos, com a finalidade de construir sensores que possam atuar no controle de qualidade e classificação a partir de aspectos físicos ligados ao estádio de maturação. O objetivo deste trabalho foi estimar o volume do fruto de macaúba a partir de imagens digitais obtidas pela técnica de Moiré por meio de uma única câmera associada ao uso de técnicas de correção digital da deformação das imagens, comparando os volumes estimados por métodos convencionais. Os volumes obtidos pela técnica de Moiré foram comparados com os volumes obtidos pelo método de deslocamento de coluna de água e pelo método do deslocamento de sementes de painço. Os volumes medidos pela técnica de Moiré apresentam um erro médio de 13,54 e de 11,09% quando comparados aos métodos convencionais, sendo considerada uma alternativa robusta e de baixo custo para a mensuração do volume de frutos de macaúba.

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Section: Introductionmentioning

confidence: 99%

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Costa

Ribeiro

Braga

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…It was assumed that binary Gray codes are used, so that N K = log 2 K. The source illuminance is 50 lux. 5 Similar analysis can be performed for other structured light schemes such as phase-shifting [13] and N-ary coding [6]. See the supplementary technical report [2] for analysis and results for N-ary coding.…”

Section: Results 3 (Acquisition Time For Concentrate-and-scan)mentioning

confidence: 93%

“…Some typical examples are single line stripes [3], sinusoidal patterns [13], binary patterns [11] and deBruijn codes [15]. For a comprehensive survey on existing coding schemes, the reader is referred to [12].…”

Section: Related Workmentioning

confidence: 99%

Structured Light in Sunlight

Gupta

Yin

Nayar

2013

2013 IEEE International Conference on Computer Vision

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“…The phase shifting methods contain single phase shifting and multiple phase shifting, both of them are in time multiplexing. The phase shifting technique is firstly proposed by (Srinivasan et al, 1985). Other single phase shifting approaches are introduced in the following years, such as (Wust and Capson, n.d.) and (Guan et al, 2003).…”

Section: Related Workmentioning

confidence: 99%

Structured Light Based 3d Scanning for Specular Surface by the Combination of Gray Code and Phase Shifting

Zhang¹,

Yilmaz²

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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ABSTRACT:Surface reconstruction using coded structured light is considered one of the most reliable techniques for high-quality 3D scanning. With a calibrated projector-camera stereo system, a light pattern is projected onto the scene and imaged by the camera. Correspondences between projected and recovered patterns are computed in the decoding process, which is used to generate 3D point cloud of the surface. However, the indirect illumination effects on the surface, such as subsurface scattering and interreflections, will raise the difficulties in reconstruction. In this paper, we apply maximum min-SW gray code to reduce the indirect illumination effects of the specular surface. We also analysis the errors when comparing the maximum min-SW gray code and the conventional gray code, which justifies that the maximum min-SW gray code has significant superiority to reduce the indirect illumination effects. To achieve sub-pixel accuracy, we project high frequency sinusoidal patterns onto the scene simultaneously. But for specular surface, the high frequency patterns are susceptible to decoding errors. Incorrect decoding of high frequency patterns will result in a loss of depth resolution. Our method to resolve this problem is combining the low frequency maximum min-SW gray code and the high frequency phase shifting code, which achieves dense 3D reconstruction for specular surface. Our contributions include: (i) A complete setup of the structured light based 3D scanning system; (ii) A novel combination technique of the maximum min-SW gray code and phase shifting code. First, phase shifting decoding with sub-pixel accuracy. Then, the maximum min-SW gray code is used to resolve the ambiguity resolution. According to the experimental results and data analysis, our structured light based 3D scanning system enables high quality dense reconstruction of scenes with a small number of images. Qualitative and quantitative comparisons are performed to extract the advantages of our new combined coding method.

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Automated phase-measuring profilometry: a phase mapping approach

Cited by 188 publications

References 8 publications

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Structured Light in Sunlight

Structured Light Based 3d Scanning for Specular Surface by the Combination of Gray Code and Phase Shifting

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