H
H. H. Hopkins
Researcher at Imperial College London
Publications - 8
Citations - 2064
H. H. Hopkins is an academic researcher from Imperial College London. The author has contributed to research in topics: Frequency response & Fourier transform. The author has an hindex of 8, co-authored 8 publications receiving 2034 citations.
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Journal Article
On the diffraction theory of optical images
TL;DR: The theory of image formation is formulated in terms of the coherence function in the object plane, the diffraction distribution function of the image-forming system and a function describing the structure of the object.
Journal ArticleDOI
On the Diffraction Theory of Optical Images
TL;DR: The theory of image formation is formulated in terms of the coherence function in the object plane, the diffraction distribution function of the image-forming system and a function describing the structure of the object.
Journal ArticleDOI
The Frequency Response of a Defocused Optical System
TL;DR: In this paper, the response of a defocused aberration-free optical system to line-frequencies in the object is studied analytically, and curves are given showing the response as a function of line-frequency for a range of values of defect of focus.
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The Numerical Evaluation of the Frequency Response of Optical Systems
TL;DR: A die for use in a food chopper downstream of the coarse-cut die is formed with an array of like small-diameter holes and on each of its faces with an arrays of grooves having a width substantially greater than the diameter of the through-going holes extending at an angle to the blade which sweeps over the upstream face of this die.