Publication

Spatial filtering and aperture apodization in digital holographic microscopy

Christian Depeursinge, Etienne Cuche
2000
Conference Papers

Abstract

We present two digital image processing methods for image quality enhancement in Digital Holographic Microscopy (DHM). With the first method, the Fourier transform of an off-axis hologram is spatially filtered in order to eliminate the zero order of diffraction and the twin image. We show that this operation enhances the image contrast and the signal to background ratio. The second method describes an original technique to perform the apodization of the hologram with a transmission profile which follows a cubic spline interpolation. The shape of the apodized aperture can be optimized by adjusting iteratively four parameters which define entirely the transmission of the aperture. We show that this operation reduces artifacts produced by diffraction effects associated to numerical reconstruction process. (C) 1999 Optical Society of America.

Official source

https://infoscience.epfl.ch/entities/publication/58fafdf8-8da8-445b-a2ad-88a226fd2241

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Christian Depeursinge, Etienne Cuche
2000
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/58fafdf8-8da8-445b-a2ad-88a226fd2241

About this result

Related concepts (32)

Fraunhofer diffraction

In optics, the Fraunhofer diffraction equation is used to model the diffraction of waves when plane waves are incident on a diffracting object, and the diffraction pattern is viewed at a sufficiently long distance (a distance satisfying Fraunhofer condition) from the object (in the far-field region), and also when it is viewed at the focal plane of an imaging lens. In contrast, the diffraction pattern created near the diffracting object and (in the near field region) is given by the Fresnel diffraction equation.

Digital image processing

Digital image processing is the use of a digital computer to process s through an algorithm. As a subcategory or field of digital signal processing, digital image processing has many advantages over . It allows a much wider range of algorithms to be applied to the input data and can avoid problems such as the build-up of noise and distortion during processing. Since images are defined over two dimensions (perhaps more) digital image processing may be modeled in the form of multidimensional systems.

Holography

Holography is a technique that enables a wavefront to be recorded and later re-constructed. Holography is best known as a method of generating real , but it also has a wide range of other applications. In principle, it is possible to make a hologram for any type of wave. A hologram is made by superimposing a second wavefront (normally called the reference beam) on the wavefront of interest, thereby generating an interference pattern which is recorded on a physical medium.

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Spatial filtering and aperture apodization in digital holographic microscopy

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