A single-pixel camera composed of optical coding masks, a photo detector, and a computational decoder, and therefore has very simple optical and electrical architectures. The optical coding masks are composed of holes on a substrate and are arranged on the circumference of a disk to allow mask switching by rotation of the disk. The main features are a simple structure that brings low cost in optics and electronics, no path difference in the mask, and no wavelength dependence except for a dependence on air for wideband spectral imaging.
A single-pixel camera composed of optical coding masks, a photo detector, and a decoding computation has an important feature of no image sensor for imaging, therefore it has very simple optical and electrical architectures. The optical coding masks whose implementation is a novelty of our research are composed of holes on a substrate, and arranged on the circumference of a disk enables us to switch with a rotation of the disk. The main features are small wavelength dependence other than air for wideband spectral imaging, and the simple structure. The spectral imaging for a sample composed of three color films is demonstrated, and the accuracy of the proposed system is evaluated.
A complex amplitude imaging method based on a single-pixel camera architecture with a complex-amplitude representation is proposed. The use of the complex-amplitude representation of the input signal and the phase-shifting technique enables us to perform the phase imaging of an object, that is, profilometry. The complex-amplitude representation of the optical coding masks and a coherent addition that is performed by interference can directly represent the Hadamard patterns that have the positive and negative values. The complex-amplitude masks are displayed on phase modulation mode liquid crystal on silicon spatial light modulator (LCOS-SLM). Furthermore, the residual area of the mask is used for the reference beam with the phase shifting. Therefore, the complex amplitude imaging system with the coaxial structure has high stability for external disturbances.
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