研究目的
Investigating the feasibility of implementing a handheld pocket-size Fourier transform profilometry (FTP) for 3-D surface profile imaging using a projector-enabled smartphone.
研究成果
The experimental proof-of-concept verifies the feasibility of implementing a 3-D handheld FTP-based surface profilometry using a projector-enabled smartphone. The NPSFTP technique shows good agreement with direct contact measurements, offering a compact, low-cost solution for real-time 3-D profiling and printing applications.
研究不足
The proposed FTP may introduce phase errors due to slight movements or shakes in the smartphone during image capture, potentially causing image blur. This issue could be mitigated by increasing shutter speed, gentle shutter pressing, or incorporating image stabilization technology.
1：Experimental Design and Method Selection:
The study employs the conventional FTP (CFTP) and the non-phase shifting (NPS) FTP techniques for 3-D surface reconstruction. A crossed-optical-axes geometry is formed using a mirror positioned over the smartphone's projector.
2：Sample Selection and Data Sources:
Diffuse test objects, including a triangular prism and a 600 ml water bottle, are used for experimental verification.
3：List of Experimental Equipment and Materials:
A projector-enabled Samsung Galaxy Beam smartphone, a planar mirror, an adjustable tilt mounting bracket, and a Moore and Wright height gauge (MW190-30DBL) for direct contact measurement.
4：Experimental Procedures and Operational Workflow:
The sinusoidal grating pattern is projected onto the test objects, and the deformed patterns are recorded. The phase information and corresponding height are extracted using Matlab program (R2014a).
5：Data Analysis Methods:
The phase retrieval and surface height calculation are accomplished using Fourier transformations, with comparisons made between the CFTP, NPSFTP, and direct contact measurement results.
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