Accurate pixel-to-pixel correspondence adjustment in a digital micromirror device camera by using the phase-shifting moiré method

Ri, Shien; Fujigaki, Motoharu; Matui, Toru; Morimoto, Yoshiharu

doi:10.1364/ao.45.006940

Cited by 45 publications

(22 citation statements)

References 12 publications

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“…Pixel-to-pixel correspondence is accurately adjusted by utilizing Shien's method. 17 The mapping has three steps as follows: first, we can control the DMD to display a checkerboard pattern. These corner coordinates ðu; vÞ of the checkerboard are already known.…”

Section: Mapping From Digital Micromirror Device To Charge Coupled Dementioning

confidence: 99%

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Removal of parasitic image due to metal specularity based on digital micromirror device camera

Zhao

Zhang

et al. 2014

Opt. Eng

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Abstract. Visual inspection for a highly reflective surface is commonly faced with a serious limitation, which is that useful information on geometric construction and textural defects is covered by a parasitic image due to specular highlights. In order to solve the problem, we propose an effective method for removing the parasitic image. Specifically, a digital micromirror device (DMD) camera for programmable imaging is first described. The strength of the optical system is to process scene ray before image formation. Based on the DMD camera, an iterative algorithm of modulated region selection, precise region mapping, and multimodulation provides removal of the parasitic image and reconstruction of a correction image. Finally, experimental results show the performance of the proposed approach.

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Section: Mapping From Digital Micromirror Device To Charge Coupled Dementioning

confidence: 99%

“…Thus, we define the maximum removable parasitic image as G max ðC; DÞ ¼ gðC max Þ∕fðD min Þ; (17) where gðCÞ denotes the relational function between the CCD pixel digital value and the corresponding irradiance on CCD pixels; and C ∈ ½0; C max is the CCD level.…”

Section: Limitationmentioning

confidence: 99%

Removal of parasitic image due to metal specularity based on digital micromirror device camera

Zhao

Zhang

et al. 2014

Opt. Eng

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“…This can be used in projection systems, digital printers, optical spectrometers, and wavefront correction systems [9][10][11][12][13]. As illustrated in Fig.…”

Section: Working Principle and Challenges Of The Dmd Cameramentioning

confidence: 99%

“…Considering that DMD is a reflective device, it is crucial to prevent overlap of the on-state and off-state light bundles of the two imaging paths. In our work, unlike the DMD cameras proposed by Nayar et al [8] and Ri et al [13], one cuboid TIR prism system is introduced to separate the incident light from the light reflected by the DMD. With the use of a TIR prism for the physical separation of the two paths, a very compact system can be achieved.…”

Section: Working Principle and Challenges Of The Dmd Cameramentioning

confidence: 99%

Design of a high-numerical-aperture digital micromirror device camera with high dynamic range

Qiao

Liu

et al. 2014

Appl. Opt.

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A high-NA imaging system with high dynamic range is presented based on a digital micromirror device (DMD). The DMD camera consists of an objective imaging system and a relay imaging system, connected by a DMD chip. With the introduction of a total internal reflection prism system, the objective imaging system is designed with a working F/# of 1.97, breaking through the F/2.45 limitation of conventional DMD projection lenses. As for the relay imaging system, an off-axis design that could correct off-axis aberrations of the tilt relay imaging system is developed. This structure has the advantage of increasing the NA of the imaging system while maintaining a compact size. Investigation revealed that the dynamic range of a DMD camera could be greatly increased, by 2.41 times. We built one prototype DMD camera with a working F/# of 1.23, and the field experiments proved the validity and reliability our work.

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“…Lens 1 in our case is a variable focal distance zoom lens. We employ a recently reported technique that utilizes a Moiré pattern [Creath 1988, Wyant 1982] to ensure 1:1 scaling, rotation and shift between the two pixel-arrays [Ri et al 2006]. Before-and-after scenarios resulting from the use of this technique are illustrated in Figure 2.…”

Section: Sub-sampling By Alignment and Registration: Anti-binningmentioning

confidence: 99%

Large-area sub-pixel resolution imaging using a spatial light modulator

Ballestad¹,

McFadden²,

Lane³

et al. 2007

SPIE Proceedings

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We report results from a proof-of-principle study investigating a technique for highresolution imaging of large fields of view (FOV). This is achieved through structured illumination of the sample from a laterally replicated spatial light modulator (SLM). By incorporating the SLM into the illumination path of an otherwise conventional microscopy imaging system, we can perform the sampling by using our illumination source instead of our areal detector (camera). The increased resolution is achieved through anti-binning or splitting of the charge-coupled device (CCD) pixels, and the extended FOV is obtained by a lateral replication technique applied to the whole illumination field. With anti-binning, we effectively exceed the sampling resolution limit set by the Nyquist theorem. Also, our lateral replication technique enables us to maintain the same FOV for the increased resolution without the need for adaptive optics or highly corrected lenses far from the optical axis. The two techniques of resolution enhancement and lateral replication of the illumination field could be employed independently, hence offering increased versatility and adaptability for specialized imaging applications. Different imaging modes can be accessed digitally, without the need to change objectives, stitch together individual frames, or move the sample. The resulting imaging modality of this system is quasi-confocal.

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Accurate pixel-to-pixel correspondence adjustment in a digital micromirror device camera by using the phase-shifting moiré method

Cited by 45 publications

References 12 publications

Removal of parasitic image due to metal specularity based on digital micromirror device camera

Removal of parasitic image due to metal specularity based on digital micromirror device camera

Design of a high-numerical-aperture digital micromirror device camera with high dynamic range

Large-area sub-pixel resolution imaging using a spatial light modulator

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