Depth From Texture Integration

Sheinin, Mark; Schechner, Yoav Y.

doi:10.1109/iccphot.2019.8747333

Cited by 4 publications

(1 citation statement)

References 29 publications

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“…So-called focus stacking (see Fig. 2), which is typically performed by using motorized or liquid lenses or by shifting the image sensor, 17,[20][21][22] maintains the luminous energy. However, while it does not negatively impact the detail sharpness, the refocusing mechanism leads to a reduced measurement speed and, when using special lenses, to a higher lens complexity.…”

Section: Chromatic Focus Stacking Approachmentioning

confidence: 99%

Depth-of-field extension in structured-light 3D surface imaging by fast chromatic focus stacking

Heist

Ramm

Mozaffari-Afshar³

et al. 2023

Dimensional Optical Metrology and Inspection for Practical Applications XII

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The depth range that can be captured by structured-light 3D sensors is limited by the depth of field of the lenses which are used. Focus stacking is a common approach to extend the depth of field. However, focus variation drastically reduces the measurement speed of pattern projection-based sensors, hindering their use in high-speed applications such as in-line process control. Moreover, the lenses’ complexity is increased by electromechanical components, e.g., when applying electronically tunable lenses. In this contribution, we introduce chromatic focus stacking, an approach that allows for a very fast focus change by designing the axial chromatic aberration of an objective lens in a manner that the depth-of-field regions of selected wavelengths adjoin each other. In order to experimentally evaluate our concept, we determine the distance-dependent 3D modulation transfer function at a tilted edge and present the 3D measurement of a printed circuit board with comparatively high structures.

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Section: Chromatic Focus Stacking Approachmentioning

confidence: 99%