As high-quality 3D range scanners become increasingly adopted, a common issue emerges that is how best to properly store captured 3D data as it inherently contains a large amount of information per each frame. One approach that has proved successful is to convert 3D range data to 2D regular color images that can be further compressed using traditional image compression techniques (e.g., JPEG). In literature, there are three major conversion methods: (1) virtual fringe projection; (2) direct depth encoding; and (3) multiwavelength depth en- coding. This paper compares the effectiveness and limitations of all three major compression methods, especially when the resultant 2D images are stored with low-quality lossy (i.e., JPEG) image formats. Experimental data found that multiwavelength depth encoding outperforms both other methods, especially under various levels of lossy JPEG compression. Principles of each method will be explained, and experimental data will be presented to evaluate each method.
KEYWORDS: 3D metrology, Projection systems, Binary data, 3D acquisition, Digital Light Processing, Digital micromirror devices, Optical metrology, 3D displays, Calibration, Phase shifts
Decade-long research efforts toward superfast three-dimensional (3-D) shape measurement leveraging the digital micromirror device (DMD) platforms are summarized. Specifically, we will present the following technologies: (1) high-resolution real-time 3-D shape measurement technology that achieves 30 Hz simultaneous 3-D shape acquisition, reconstruction, and display with more than 300,000 points per frame; (2) superfast 3-D optical metrology technology that achieves 3-D measurement at a rate of tens of kilohertz utilizing the binary defocusing method we invented; and (3) the improvement of the binary defocusing technology for superfast and high-accuracy 3-D optical metrology using the DMD platforms. Both principles and experimental results are presented.
KEYWORDS: 3D metrology, Projection systems, Digital Light Processing, Binary data, 3D acquisition, Cameras, 3D displays, Digital micromirror devices, Optical metrology, Phase shifts
This paper summarizes our decade-long research efforts towards superfast 3D shape measurement leveraging the digital
micromirror device (DMD) platforms. Specifically, we will present the following technologies: (1) high-resolution real-time
3D shape measurement technology that achieves 30 Hz simultaneous 3D shape acquisition, reconstruction and display
with more than 300,000 points per frame; (2) Superfast 3D optical metrology technology that achieves 3D measurement at
a rate of tens of kHz utilizing the binary defocusing method we invented; and (3) the improvement of the binary defocusing
technology for superfast and high-accuracy 3D optical metrology using the DMD platforms. This paper will present both
principles and experimental results.
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