Improvement of color reproduction in color digital holography by using spectral estimation technique

Xia, Peng; Shimozato, Yuki; Ito, Yasunori; Tahara, Tatsuki; Kakue, Takashi; Awatsuji, Yasuhiro; Nishio, K.; Ura, Shogo; Kubota, Toshihiro; Matoba, Osamu

doi:10.1364/ao.50.00h177

Cited by 55 publications

(17 citation statements)

References 26 publications

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“…Multiwavelength digital holography has the ability for not only color 3D imaging [19,20], but also dispersion imaging [21] and 3D shape measurement with a wide range by using multiwavelength phase unwrapping [22], due to the recording of quantitative phase information with multiple wavelengths. Temporal division [23][24][25], spatial division [26][27][28], and space-division multiplexing [19,20,29], which are generally adopted for multiwavelength imaging in an imaging system, can be merged into digital holography to record multiple wavelengths. In general imaging systems, wavelength information is temporally or spatially separated when recording image(s), as shown in Figure 1(a)-(e).…”

Section: Introductionmentioning

confidence: 99%

Multiwavelength Digital Holography and Phase-Shifting Interferometry Selectively Extracting Wavelength Information: Phase-Division Multiplexing (PDM) of Wavelengths

Tahara¹,

Otani²,

Arai³

et al. 2017

Holographic Materials and Optical Systems

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In this chapter, we introduce multiwavelength digital holographic techniques and a novel multiwavelength imaging technique. General multiwavelength imaging systems adopt temporal division, spatial division, or space-division multiplexing to obtain wavelength information. Holographic techniques give us unique multiwavelength imaging systems, which utilize temporal or spatial frequency-division multiplexing. Conventional multiwavelength digital holography systems have been combined with one of the methods listed above. We have proposed phase-shifting interferometry selectively extracting wavelength information, characterized as a multiwavelength threedimensional (3D) imaging technique based on holography and called phase-division multiplexing (PDM) of multiple wavelengths. In PDM, wavelength-multiplexed phaseshifted holograms are recorded, and multiwavelength information is separately extracted from the holograms in the space domain. Phase shifts are introduced for respective wavelengths to separate object waves with multiple wavelengths in the polar coordinate plane, and multiple object waves are selectively extracted by the signal processing based on phase-shifting interferometry. Additionally, the system of equations needed to obtain a multiwavelength 3D image is solved with less wavelengthmultiplexed images using two-step phase-shifting interferometry-merged phase-division multiplexing (2π-PDM), which makes the best use of 2π ambiguity of the phase and two-step phase-shifting method. The PDM techniques are reviewed and color 3D imaging ability is described with numerical and experimental results.

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Section: Introductionmentioning

confidence: 99%

Multiwavelength Digital Holography and Phase-Shifting Interferometry Selectively Extracting Wavelength Information: Phase-Division Multiplexing (PDM) of Wavelengths

Tahara¹,

Otani²,

Arai³

et al. 2017

Holographic Materials and Optical Systems

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“…The quantity of the reconstruction image in a parallel phase-shifting digital hologram is not as good as sequent a phase-shifting digital hologram. Several methods for image quality improvement [13][14][15] and reconstruction image quality comparison [16,17] are among some methods inside parallel phase shifting are introduced. On the other hand, in those papers, the authors did not analyze any errors that occurred because of the under sampling rate when performing the separation and interpolation process in parallel two-step phase shifting.…”

Section: Introductionmentioning

confidence: 99%

Error analysis in parallel two-step phase-shifting method

et al. 2013

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This paper presents an analysis of error in parallel two-step phase-shifting method. From the analysis, it is clarified that the maximum bandwidth of the object that this technique can capture is a half bandwidth of recording devices. Also, the recording distance must be two times longer than the conventional method to have a good reconstruction image. The analysis was verified by simulations and experimental results.

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“…Despite their design simplicity, on-chip imaging approaches also present some challenges that need to be addressed to improve the imaging performance, including the spatial resolution12728. The first one of these challenges is a result of placing the objects very close to the detector array (i.e., on a chip ) as illustrated in Fig.…”

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confidence: 99%

Spectral Demultiplexing in Holographic and Fluorescent On-chip Microscopy

Şencan

Coşkun

Sikora

et al. 2014

Sci Rep

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Lensfree on-chip imaging and sensing platforms provide compact and cost-effective designs for various telemedicine and lab-on-a-chip applications. In this work, we demonstrate computational solutions for some of the challenges associated with (i) the use of broadband, partially-coherent illumination sources for on-chip holographic imaging, and (ii) multicolor detection for lensfree fluorescent on-chip microscopy. Specifically, we introduce spectral demultiplexing approaches that aim to digitally narrow the spectral content of broadband illumination sources (such as wide-band light emitting diodes or even sunlight) to improve spatial resolution in holographic on-chip microscopy. We also demonstrate the application of such spectral demultiplexing approaches for wide-field imaging of multicolor fluorescent objects on a chip. These computational approaches can be used to replace e.g., thin-film interference filters, gratings or other optical components used for spectral multiplexing/demultiplexing, which can form a desirable solution for cost-effective and compact wide-field microscopy and sensing needs on a chip.

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Improvement of color reproduction in color digital holography by using spectral estimation technique

Cited by 55 publications

References 26 publications

Multiwavelength Digital Holography and Phase-Shifting Interferometry Selectively Extracting Wavelength Information: Phase-Division Multiplexing (PDM) of Wavelengths

Multiwavelength Digital Holography and Phase-Shifting Interferometry Selectively Extracting Wavelength Information: Phase-Division Multiplexing (PDM) of Wavelengths

Error analysis in parallel two-step phase-shifting method

Spectral Demultiplexing in Holographic and Fluorescent On-chip Microscopy

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