A recent study found that it is very difficult to use the squared binary defocusing technique to eliminate the influence of third-order harmonics without compromising fringe quality, and thus it is challenging to utilize Fourier transform profilometry to achieve high-quality three-dimensional measurement. A novel approach is presented to effectively eliminate the third-order harmonics by modulating the squared binary structured patterns. Both simulation and experiments are presented to verify the performance of the proposed technique.
Our recent study found that it is very difficult to use the binary defocusing technique to completely suppress the 3rd-order harmonics, and thus it is challenging to achieve high-quality three-dimensional (3-D) measurement with the Fourier transformation method. This paper presents a novel approach to effectively eliminate the 3rd order harmonics by modulating the binary structured patterns in both x and y directions. Both simulation and experimental results will be presented to verify the performance of the proposed technique.
Structured light system calibration has been widely studied over the decades, and a variety of calibration approaches have
been proposed. Among these methods, the flexible method using flat checkerboard is widely adopted. However, there is
a lack of studies on selecting the optimal checker size for high accuracy calibration, whilst it is vital to understanding this
factor. This paper presents a systematic study on how the checker size affects the calibration accuracy for a structured
light system, and provides a general guideline to select the optimal size. For this initial study, 7 different checker sizes are
selected, and experiments demonstrated that the system achieved the best calibration accuracy within a certain range of
checker size.
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