DMD-based optical pattern recognition using holograms generated with the Hartley transform

Cheremkhin, Pavel A.; Krasnov, Vitaly V.; Rodin, Vladislav G.; Starikov, Rostislav S.

doi:10.1016/j.optlaseng.2023.107584

Cited by 4 publications

(1 citation statement)

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“…In holographic projection systems using LCOS, the astigmatism caused by oblique illumination can be corrected by adding a virtual cylindrical lens phase into the computer generated hologram (CGH) [20]. On the other hand, DMDs have several advantages over LCOS, including high frame rate(32 kHz) [21], a wide spectral range of operation (UV-IR), and high reliability, making them more suitable for many applications, including 3D-printing [22,23], single-pixel imaging [24,25], microscopy [26][27][28], spectroscopy [29,30], pattern recognition [31], media analysis [32], etc. Some researchers have studied the projection system of DMD with spherical wave illumination [12,17], but they have neglected the aberration.…”

Section: Introductionmentioning

confidence: 99%

Aberration Correction and Speckle Noise Reduction in Image Minified Lensless Holographic Projection Based on Digital Micro-Mirror Device

Li,

Xia,

Wang

et al. 2024

IEEE Photonics J.

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Lensless holographic projection technology allows for removing of the projection lens and simplifies the optical projection system. It has great potential to be applied in the fields of three-dimensional printing, integrated circuit fabrication, and display. In this paper, for image minified lensless holographic projection based on digital micro-mirror device (DMD), we examine the aberration that arises from the use of the DMD in the presence of oblique converging spherical wave illumination. To correct this aberration, we employ a diagonal compression technique on the target pattern. Additionally, we address the issue of speckle noise by relaxing the amplitude constraint in the nonsignal domain, which is generated by our proposed aberration correction method. Importantly, this relaxation is achieved without reducing the size of the valid image. Our experimental results demonstrate the successful reconstruction of high-quality images in a lensless holographic projection system.

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