Journal ArticleDOI
Image processing for extended depth of field
Ronald J. Pieper,Adrianus Korpel +1 more
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TLDR
Three algorithms for implementing an improved composite image construction by setting criteria for selecting the in-focus segments of an image sample are discussed.Abstract:
Improvement in the depth of field is demonstrated by properly processing a succession of image samples. Due to the limited depth of field each image sample has in-focus as well as out-of-focus segments. By setting criteria for selecting the in-focus segments, an improved composite image is formed. Three algorithms for implementing this construction are discussed.read more
Citations
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Journal ArticleDOI
Complex wavelets for extended depth‐of‐field: A new method for the fusion of multichannel microscopy images
TL;DR: This work shows how the wavelet‐based image fusion technique can be improved and easily extended to multichannel data and proposes the use of complex‐valued wavelet bases, which seem to outperform traditional real‐valuedWavelet transforms.
Patent
Extended depth of field optical systems
W. T. Cathey,Edward R. Dowski +1 more
TL;DR: In this paper, a special purpose optical mask was designed to cause the optical transfer function to remain essentially constant within some range from the in-focus position, resulting in an infocus image over an increased depth of field.
Journal ArticleDOI
Extended focused image in microscopy by digital Holography.
Pietro Ferraro,Simonetta Grilli,Domenico Alfieri,Sergio De Nicola,Andrea Finizio,Giovanni Pierattini,Bahram Javidi,Giuseppe Coppola,V. Striano +8 more
TL;DR: It is demonstrated that an extended focused image of an object can be obtained through digital holography without any mechanical scanning or special optical components.
Journal ArticleDOI
Computational Plenoptic Imaging
TL;DR: This state‐of‐the‐art report reviews approaches that optically encode the dimensions of the plenoptic function transcending those captured by traditional photography and reconstruct the recorded information computationally.
Patent
Imaging using a multifocal aspheric lens to obtain extended depth of field
Nicholas George,Wanli Chi +1 more
TL;DR: In this paper, a system for imaging with a circularly symmetric multifocal aspheric lens for obtaining an extended depth of field is presented. But the system is limited to a single image.
References
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Journal ArticleDOI
A method to increase the depth of focus by two step image processing
TL;DR: The method to obtain an increased depth of field consists of producing a modified incoherent image of the three dimensional object which, though degraded, has the same degradation for all object planes.
Journal ArticleDOI
Improvement in the OTF of a Defocused Optical System Through the Use of Shaded Apertures.
TL;DR: To improve the imaging properties of a defocused optical system, the use of shaded apertures is studied theoretically and experimentally and shows that near focus the OTF for T(A) has higher values in the low frequency region than has either T(B) or T(c).
Journal ArticleDOI
Coherent processing and depth of focus of annular aperture imagery.
TL;DR: Images from high aspect ratio annulus apertures are spatially filtered in a coherent optical processor for equalization of the modulation transfer function and the depth of focus is substantially greater than that of conventional imagery with comparable resolution.
Journal ArticleDOI
Extreme Focal Depth in Microscopy
TL;DR: In this paper, the authors describe and give some of the results of using a microscope which increases the useful depth of observation of an object in a photograph to many times the focal depth of the lens system being used.
Journal ArticleDOI
White-light Three Dimensional Microscopy using Multiple-image Storing and Decoding
TL;DR: There is a need in microscopy for high quality imaging of transparent specimens which have a large axial depth compared with the depth of focus, and when a biologist needs detailed information throughout the thickness of a specimen, he has to take a series of successive photographs on separate plates (or film frames).