An optical profilometer composed of an optical frequency comb source, a single pixel camera, and an optoelectronic interferometer in radio frequecny range have been developed toward large volume metrology. The optical profilometer allows us to measure an object with a large depth much more than a light wavelength without any 2π phase ambiguity. The wide dynamic range is achieved with high stability of the optical frequency comb and the simultaneous multi-singlefrequency operation. The single pixel camera is used for two-dimensional imaging without a mechanical scanning and the compressive sensing technique reduces the number of measurements. A surface profilometry for an object with a depth of several centimeters to a meter is demonstrated.
In the transformation based compression algorithms of digital hologram for three-dimensional object, the balance
between compression ratio and normalized root mean square (NRMS) error is always the core of algorithm development.
The wavelet transform method is efficient to achieve high compression ratio but NRMS error is also high. In order to
solve this issue, we propose a hologram compression method using Wavelet-Bandelets transform. Our simulation and
experimental results show that the Wavelet-Bandelets method has a higher compression ratio than Wavelet methods and
all the other methods investigated in this paper, while it still maintains low NRMS error.
KEYWORDS: 3D image processing, 3D displays, Confocal microscopy, 3D modeling, Image processing, Integral imaging, Microscopes, 3D image reconstruction, 3D image enhancement, Displays
We propose a method for pickup and display of the microscopic object using confocal microscopy and integral imaging.
Instead of the conventional pickup process of integral imaging, we use a confocal microscopy to measure the three-dimensional
shape of the microscopic objects. The elemental images are then calculated from the measured three-dimensional
shape of the objects, considering the lens array specifications of the display process. Finally, three-dimensional
image of the microscopic object is displayed using integral imaging display process. The three-dimensional
model of the microscopic object constructed using confocal microscopy makes it possible to generate the elemental
images for any lens array specifications, providing the full freedom in configuring integral imaging display system. Also,
the generated elemental images are free from any distortions of the lens arrays, hence it enhances the quality of the
reconstructed three-dimensional images and enables the three dimensional images to be displayed at a longer distance.
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