Color-coded projection grating method for shape measurement with a single exposure

Liu, Weiyi; Wang, Zhaoqi; Mu, Guoguang; Fang, Zhiliang

doi:10.1364/ao.39.003504

Cited by 53 publications

(24 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…we can build such a code by fixing the first six message bits of the (16,11) extended Hamming code to be 0, which leads to a (10,5) shortened extended Hamming code with a minimum distance of 4.…”

Section: B Composite Fringe Patterns Projectionmentioning

confidence: 99%

“…However, when large depth discontinuities are observed, the wrong decision of unwrapping may be made regarding the addition or subtraction of 2π. In order to implement reliable and accurate unwrapping, intensive studies have been devoted, and various approaches have been developed, including the quality-guided methods [2][3][4][5], the temporal method [6][7][8][9][10], and color-projectionbased methods [11][12][13][14][15][16][17][18]. With quality-guided methods, every pixel on the phase maps is associated with a quality value measuring the smoothness of the pixel in contrast to its surrounding ones.…”

Section: Introductionmentioning

confidence: 99%

“…Several color-projection-based approaches are proposed [11][12][13][14][15][16]. Wang et al [11] proposes a colorembedded FTP, where every individual fringe is associated with a particular color, and phase unwrapping can be implemented by retrieving the color of each fringe.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Three-dimensional measurement of object surfaces with complex shape and color distribution based on projection of color fringe patterns

Chen

et al. 2013

Appl. Opt.

View full text Add to dashboard Cite

A challenging issue associated with three-dimensional (3D) fringe patterns profilometry (FPP) is the unwrapping of phase maps resulting from color object surfaces. This paper proposes a new colorprojectionbased 3D FPP, making use of the three primary color channels [i.e., red, green, and blue (RGB)] associated with digital projectors. One channel (e.g., red) is used for projecting sinusoidal fringes required by phase shift profilometry (PSP); the other two channels are employed for generating binary stripe patterns. In order to achieve reliable phase unwrapping, each fringe of the sinusoidal patterns is identified by a unique binary sequence. These sequences are then encoded by a channel-encoding scheme used in the area of communication. The encoded sequences are embedded in the binary coding stripe images, which are projected together with the sinusoidal patterns. The three image patterns are reflected by the object surface and captured by an RGB 3-CCD camera. The reflected sinusoidal patterns are employed to yield a wrapped phase map, and the binary stripe patterns are used to retrieve the encoded sequences, which are then decoded to yield the original binary sequences for phase unwrapping. Compared with existing color-encoded algorithms, the proposed approach uses binary codes instead of fringe color to identify the fringes, which are less sensitive to the disturbances caused by object surface color and illumination noises. Furthermore, use of the channel-coding scheme provides extra resistance to the disturbances caused by object surface color and illumination noises. Experimental results are presented to confirm the effectiveness of the proposed technique. A challenging issue associated with three-dimensional (3D) fringe patterns profilometry (FPP) is the unwrapping of phase maps resulting from color object surfaces. This paper proposes a new colorprojection-based 3D FPP, making use of the three primary color channels [i.e., red, green, and blue (RGB)] associated with digital projectors. One channel (e.g., red) is used for projecting sinusoidal fringes required by phase shift profilometry (PSP); the other two channels are employed for generating binary stripe patterns. In order to achieve reliable phase unwrapping, each fringe of the sinusoidal patterns is identified by a unique binary sequence. These sequences are then encoded by a channel-encoding scheme used in the area of communication. The encoded sequences are embedded in the binary coding stripe images, which are projected together with the sinusoidal patterns. The three image patterns are reflected by the object surface and captured by an RGB 3-CCD camera. The reflected sinusoidal patterns are employed to yield a wrapped phase map, and the binary stripe patterns are used to retrieve the encoded sequences, which are then decoded to yield the original binary sequences for phase unwrapping. Compared with existing color-encoded algorithms, the proposed approach uses binary codes instead of fringe color to identify the fringes, which are less se...

show abstract

Section: B Composite Fringe Patterns Projectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional measurement of object surfaces with complex shape and color distribution based on projection of color fringe patterns

Chen

et al. 2013

Appl. Opt.

View full text Add to dashboard Cite

show abstract

“…Weiyi Liu et al 12 proposed a color-coded projection grating method for shape measurement with a single exposure. Eight different colors were used to code the projection grating.…”

Section: Introductionmentioning

confidence: 99%

A new approach for simple and rapid shape measurement of objects with surface discontinuities

Gorthi

Lolla

2005

SPIE Proceedings

View full text Add to dashboard Cite

A new approach for unwrapping phase maps, obtained during the measurement of 3-D surfaces using sinusoidal structured light projection technique, is proposed. "Takeda's method" is used to obtain the wrapped phase map. Proposed method of unwrapping makes use of an additional image of the object captured under the illumination of a specifically designed color-coded pattern. The new approach demonstrates, for the first time, a method of producing reliable unwrapping of objects even with surface discontinuities from a single-phase map. It is shown to be significantly faster and reliable than temporal phase unwrapping procedure that uses a complete exponential sequence. For example, if a measurement with the accuracy obtained by interrogating the object with S fringes in the projected pattern is carried out with both the methods, new method requires only 2 frames as compared to (log 2 S +1) frames required by the later method.

show abstract

“…They are capable of extracting 3D data from a single image. Different color-coding strategies can be seen in [6], [7]. However, they can give only sparse 3D data.…”

Section: Introductionmentioning

confidence: 99%

New Phase Unwrapping Strategy for Rapid and Dense 3D Data Acquisition in Structured Light Approach

Siva

Rao

Fringe 2005

View full text Add to dashboard Cite

Sinusoidal structured light projection (SSLP) technique, specifically-phase stepping method, is in widespread use to obtain accurate, dense 3-D data. But, if the object under investigation possesses surface discontinuities, phase unwrapping (an intermediate step in SSLP) stage mandatorily require several additional images, of the object with projected fringes (of different spatial frequencies), as input to generate a reliable 3D shape. On the other hand, Color-coded structured light projection (CSLP) technique is known to require a single image as in put, but generates sparse 3D data. Thus we propose the use of CSLP in conjunction with SSLP to obtain dense 3D data with minimum number of images as input. This approach is shown to be significantly faster and reliable than temporal phase unwrapping procedure that uses a complete exponential sequence. For example, if a measurement with the accuracy obtained by interrogating the object with 32 fringes in the projected pattern is carried out with both the methods, new strategy proposed requires only 5 frames as compared to 24 frames required by the later method.

show abstract

Color-coded projection grating method for shape measurement with a single exposure

Cited by 53 publications

References 13 publications

Three-dimensional measurement of object surfaces with complex shape and color distribution based on projection of color fringe patterns

Three-dimensional measurement of object surfaces with complex shape and color distribution based on projection of color fringe patterns

A new approach for simple and rapid shape measurement of objects with surface discontinuities

New Phase Unwrapping Strategy for Rapid and Dense 3D Data Acquisition in Structured Light Approach

Contact Info

Product

Resources

About