We apply the techniques of digital holography to obtain microscopic three-dimensional images of biological cells. The optical system is capable of microscopic holography with diffraction-limited resolution by projecting a magnified image of a microscopic hologram plane onto a CCD plane. Two-wavelength phase-imaging digital holography is applied to produce unwrapped phase images of biological ce...

Compressive sensing provides a new framework for simultaneous sampling and compression of signals. According to compressive sensing theory one can recover compressible signals and images from far fewer samples or measurements that traditional methods use. Applying compressive sensing theory for holography comes natural since three-dimensional (3D) data is typically very redundant, thus it is al...

Digital holography (DH) is a promising technique for modern three-dimensional (3D) imaging. Coherent holography records the complex amplitude of a 3D object holographically, giving speckle noise upon reconstruction and presenting a serious drawback inherent in coherent optical systems. On the other hand, incoherent holography records the intensity distribution of the object, allowing a higher s...

This paper presents a digital holographic method to visualize and measure refractive index variations, convection currents, or thermal gradients, occurring inside transparent but strongly refracting object. The proof of principle is provided through the visualization of refractive index variation inside a lighting ampoule. Comparison with transmission and reflection holography is also provided....

objective: the aim of this study is to evaluate the effectiveness of the metacognitive model in treating post-traumatic stress disorder. method: in a single-subject experimental trial of multiple baseline type, the treatment process was carried out on an 18-year-old male subject. the patient satisfied the dsm-iv criteria for ptsd and was assessed for pre-duration and post treatment. the scales ...

A novel technique dubbed self-interference incoherent digital holography (SIDH) is being developed for imaging of natural scenes such as astronomical objects or daylightilluminated outdoor scenes. OCIS codes: (090.1995) Digital holography; (100.6880) Three-dimensional image acquisition; (110.1080) Active or

In recent years compressive sensing has been successfully introduced in digital holography. Depending on the ability to sparsely represent an object, the compressive sensing paradigm provides an accurate object reconstruction framework, from a relatively small number of encoded signal samples. Digital holography has been proven to be an efficient and physically realizable sensing modality that ...

Recent developments in digital holography techniques are presented. The Fourier transform and convolution methods to calculate the diffraction fields are compared with the angular spectrum method, which allows short reconstruction distances down to zero with flexibility in the control of image noise. Examples of applications of digital holography in biological microscopy are presented with subm...

A kind of interference measurement system with crystal is designed, which is not influenced much by other factors such as vibration for the property of common path. For the distance measurement, the phase of fringes is calculated on the oblique incident holography to avoid effects of fringe curvature, backup and light fluctuation. But the measurement result is affected by the uniformity of the ...

Since its conception, holography has been put to a variety of uses including data storage, security, and interferometry. However, perhaps the most popular application of holography is using the technique to make three-dimensional images [1]. This paper describes an algorithm for computationally generating holograms along with methods to fabricate the hologram. Holography has since made a jump f...