High-speed 3D measurement is receiving increasing attention. However, simultaneously achieving high computational efficiency, algorithmic robustness, and reconstructing ratio challenging. Therefore, a dynamic phase-differencing profilometry (DPDP) proposed. By capturing the minimum three phase-shifting sinusoidal deformed patterns establishing brand-new model, phase difference between object on reference plane directly resolved to effectively improve efficiency. Although it wrapped, by using...

In fringe projection profilometry (FPP) based on temporal phase unwrapping (TPU), reducing the number of projecting patterns has become one most important works in recent years. To remove 2π ambiguity independently, this paper proposes a TPU method unequal phase-shifting code. Wrapped is still calculated from N-step conventional with equal amount to guarantee measuring accuracy. Particularly, series different amounts relative first pattern are set as codewords, and encoded periods generate...

Fringe projection profilometry based on temporal phase unwrapping (TPU) without error propagation has been widely used to measure the three-dimensional (3-D) shape of complex scene. This paper develops a phase-shifting (PS-TPU) algorithm ensure measuring robustness and speed at same time. In this method, series shifts are set as cue fringe order, then embedded into different periods single quasi-cosine pattern. High-quality wrapped coded obtained from three conventional patterns pattern can...

An absolute phase retrieval method based on fringe amplitude encoding is proposed. Different from the conventional intensity coding methods which are time division multiplexing with multiple additional auxiliary patterns, proposed order strategy codeword overlapping interaction space multiplexing. It just directly encodes different amplitudes for periods in corresponding sinusoidal phase-shifting patterns to generate composite and quantifies into four levels as strategy, so it can retrieve...

An improved algorithm for phase-to-height mapping in phase-measuring profilometry (PMP) is proposed, which the relationship no longer restricted to condition that optical axes of imaging system must be orthogonal reference plane basic PMP. Only seven coefficients independent coordinate need calibrated, and calibration can accomplished using only two different gauge blocks, instead more than three standard planes. With proposed algorithm, both phase measurement completed simultaneously, makes...

A new 3D measuring method based on computer-generated moiré fringes is proposed. The two AC components of the 0-degree and 90-degree phase-shifted fringe patterns reference plane are prepared in advance. While component single-shot deformed pattern multiplied by components, respectively, can be retrieved. ratio just tangent phase modulated object. It great potential real-time or even dynamical measurement due to its feature, it avoids influences object's reflectivity simultaneously. Compared...

In this paper, a generalized spatial-temporal phase unwrapping algorithm (STPUA) is proposed for extracting the absolute of isolated objects with intricate surfaces. This can eliminate thoroughly order jumps various temporal algorithms (TPUAs), while inheriting high measuring accuracy quality-guided (QGPUAs). Differing from traditional algorithms, wrapped first divided into several regional phases, which be extracted successively according to its areas and unwrapped individually by QGPUAs....

A curtain-type phase unwrapping algorithm is proposed. First, the 2 × closed curve method used to find out residual point of wrapped form template, and Otsu threshold binary modulation deformed pattern shadow template. Second, effective phases up-down symmetrical points about starting are simultaneously unwrapped in turn until all column completed. Third, taken as center left-right symmetry, nearest symmetric unwrapped, corresponding columns same way above. Fourth, this way, successively...

Temporal phase unwrapping based on single auxiliary binary coded pattern has been proven to be effective for high-speed 3D measurement. However, in traditional spatial coding, it often leads an imbalance between the number of periodic divisions and codewords. To meet this challenge, a large codewords orthogonal coding method is proposed paper. By expanding multiplexing from 1D 2D direction, goes beyond 8 27 at three-level division. In addition, novel full-period connected domain segmentation...

The absolute phase retrieval has been the focus of developments in three-dimensional (3D) shape measurement. traditional retrievals based on phase-shifting algorithm mainly utilize extra patterns to generate fringe order map, which decreases measuring speed and income more shift error. In this paper, cue is directly embedded into minimize number projecting patterns. Fringe encoded by rotating sequence amounts, causing 2&#x03C0; discontinuity be extended &#x00B1;2&#x03C0;/<i>N</i>,...

Multi-frequency temporal phase unwrapping (TPU) has been extensively used in phase-shifting profilometry (PSP) for the high-accuracy measurement of objects with surface discontinuities and isolated objects. However, a large number fringe patterns are commonly required. To reduce required patterns, new hybrid multi-frequency composite-pattern TPU method was developed using fewer than conventional TPU. The combines unit-frequency ramp pattern three low-frequency phase-shifted to form composite...

A spatial phase unwrapping algorithm based on multi-anchors bidirectional location and suppression (SPUA-MBLS) is proposed. Spatial algorithms (SPUAs) can play an important role in three-dimensional (3-D) measurement due to their without any additional auxiliary pattern. SPUAs line scanning achieve much faster line-by-line than the traditional SPUA reliability sort, such as quality-guided SPUA. But they are prone suffer from residual error propagation caused by noise. The proposed first...