Image PSF-matching and subtraction: A powerful astronomical technique and its application to industrial imaging

Raymond F. Butler, Seathrun O'Tuairisg, Andrew Shearer, Aaron Golden

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

There is a family of difficult image-processing scenarios which involve seeking out and quantifying minute changes within a sequence of near-identical images. Traditionally these have been dealt with by carefully registering the images in terms of position, orientiation and intensity, and subtracting them from some template image. However, for critical measurements, this approach breaks down if the point-spread-functions (PSFs) vary even slightly from image to image. Subtraction of registered images whose PSFs are not matched leads to considerable residual structure, which may be mistakenly interpreted as real features rather than processing artefacts. In astronomy, software known as ISIS1 has been developed to fully PSF-match image sequences and to facilitate their analysis. We show here the tremendous improvement in detection rates and measurement accuracy which ISIS has afforded in our program for the study of rare variable stars in dense, globular star clusters. We discuss the genesis from this work of our new program to use ISIS to search for extra-solar planets in transit across the face of stars in such clusters. Finally we illustrate an application of ISIS in the industrial imaging sector, showing how it can be used to detect minute faults in images of products.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsA. Shearer, F.D. Murtagh, J. Mahon, P.F. Whelan
Pages201-212
Number of pages12
Volume4877
DOIs
StatePublished - 2002
Externally publishedYes
EventOpto-Ireland 2002: Optical metrology, Imaging, and Machine Vision - Galway, Ireland
Duration: Sep 5 2002Sep 6 2002

Other

OtherOpto-Ireland 2002: Optical metrology, Imaging, and Machine Vision
CountryIreland
CityGalway
Period9/5/029/6/02

Fingerprint

Optical transfer function
point spread functions
subtraction
Stars
Imaging techniques
Extrasolar planets
Astronomy
Image processing
Processing
variable stars
star clusters
extrasolar planets
transit
astronomy
image processing
artifacts
sectors
templates
breakdown
computer programs

Keywords

  • Astronomical imaging
  • Difference-imaging
  • Fault detection
  • Image convolution
  • Image registration
  • Industrial imaging
  • PSF-matching
  • Time-series analysis
  • Variability detection

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Butler, R. F., O'Tuairisg, S., Shearer, A., & Golden, A. (2002). Image PSF-matching and subtraction: A powerful astronomical technique and its application to industrial imaging. In A. Shearer, F. D. Murtagh, J. Mahon, & P. F. Whelan (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 4877, pp. 201-212) https://doi.org/10.1117/12.463684

Image PSF-matching and subtraction : A powerful astronomical technique and its application to industrial imaging. / Butler, Raymond F.; O'Tuairisg, Seathrun; Shearer, Andrew; Golden, Aaron.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / A. Shearer; F.D. Murtagh; J. Mahon; P.F. Whelan. Vol. 4877 2002. p. 201-212.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Butler, RF, O'Tuairisg, S, Shearer, A & Golden, A 2002, Image PSF-matching and subtraction: A powerful astronomical technique and its application to industrial imaging. in A Shearer, FD Murtagh, J Mahon & PF Whelan (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 4877, pp. 201-212, Opto-Ireland 2002: Optical metrology, Imaging, and Machine Vision, Galway, Ireland, 9/5/02. https://doi.org/10.1117/12.463684
Butler RF, O'Tuairisg S, Shearer A, Golden A. Image PSF-matching and subtraction: A powerful astronomical technique and its application to industrial imaging. In Shearer A, Murtagh FD, Mahon J, Whelan PF, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 4877. 2002. p. 201-212 https://doi.org/10.1117/12.463684
Butler, Raymond F. ; O'Tuairisg, Seathrun ; Shearer, Andrew ; Golden, Aaron. / Image PSF-matching and subtraction : A powerful astronomical technique and its application to industrial imaging. Proceedings of SPIE - The International Society for Optical Engineering. editor / A. Shearer ; F.D. Murtagh ; J. Mahon ; P.F. Whelan. Vol. 4877 2002. pp. 201-212
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