Three Dimensional Inspection Using Multistripe Structured Light

Jalkio, Jeffrey A.; Kim, Richard C.; Case, Steven K.

doi:10.1117/12.7973609

Cited by 96 publications

(27 citation statements)

References 4 publications

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“…Prior approaches using radiometric variations include structured light (e.g. [10,23]), and the more general space-time stereo framework [27,6]. Image intensity ratios are also a well studied method for recovering depth which are often formulated as using radiometric variation [4,19].…”

Section: Related Workmentioning

confidence: 99%

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BRDF invariant stereo using light transport constancy

Davis

Yang

Wang

2005

Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1

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Nearly all existing methods for stereo reconstruction assume that scene reflectance is Lambertian and make use of brightness constancy as a matching invariant. We introduce a new invariant for stereo reconstruction called Light Transport Constancy, which allows completely arbitrary scene reflectance (BRDFs). This invariant can be used to formulate a rank constraint on multiview stereo matching when the scene is observed by several lighting configurations, in which only the lighting intensity varies.In addition, we show that this multiview constraint can be used with as few as two cameras and two lighting configurations. Unlike previous methods for BRDF invariant stereo, Light Transport Constancy does not require precisely configured or calibrated light sources, or calibration objects in the scene. Importantly, the new constraint can be used to provide BRDF invariance to any existing stereo method, whenever appropriate lighting variation is available.

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Section: Related Workmentioning

confidence: 99%

“…# of cameras # of lights # of cameras # of variations # of variations # of lights (10) Let us denote the matrix on the left side I, and the two matrices on the right L (lighting modulation matrix) and R (reflectance matrix). From the factorization, we can see that there is a rank constraint on matrix I.…”

Section: Ltc As a Rank Constraintmentioning

confidence: 99%

BRDF invariant stereo using light transport constancy

Davis

Yang

Wang

2005

Tenth IEEE International Conference on Computer Vision (ICCV'05) Volume 1

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“…Various optical techniques have been developed for shape measurement, such as scanning methods [1][2][3][4], structured-light methods [5][6][7][8][9][10], stereo measurement methods [11] and interferometric profilometry [12][13][14][15][16][17][18]. The scanning methods possess relatively low measurement speed due to the scanning procedure.…”

Section: Introductionmentioning

confidence: 99%

A sequence pulse counting method for shape measurement in dual-beam speckle interferometry

Liu

2011

Sci. China Phys. Mech. Astron.

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A temporal approach to fast shape measurement is presented. In principle, the rotational object method is used in combination with the sequence pulse counting method (SPCM) to determine the height of the object through calculating the related phase. Two specimens are tested to demonstrate the validity of the approach. One is an object covered by a Chinese character (tea) with a height variety of 0.3 mm, and the other is an object surface with a relatively large fluctuation of 3.5 mm. The experimental results are compared with mechanical measurements. An axis shifting method is also proposed to determine shapes with relatively large fluctuations. Effects of such parameters on the height measurement as incident angle of the dual light beams, tilting angle of the object, and azimuth angle of the measured point are discussed as well.shape measurement, profilometry, temporal speckle pattern interferometry, phase measurement PACS: 07.60.Ly, 46.80.+j

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“…Jalkio et al [10] examined the problem of resolving stripe identity in a dual laser stripe system. They used a pair of symmetric lenses along with a triangle lens to insure that the images of both stripes were in focus and the stripes themselves were disjoint.…”

Section: Acquisitionmentioning

confidence: 99%