The development of a predictive autofocus algorithm using a general image formation model

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dc.contributor.advisorDe Jager, Gerharden_ZA
dc.contributor.advisorSewell, Bryan Trevoren_ZA
dc.contributor.authorNicolls, Frederick Cen_ZA
dc.date.accessioned2016-09-14T12:56:11Z
dc.date.available2016-09-14T12:56:11Z
dc.date.issued1995en_ZA
dc.descriptionBibliography: pages 97-99.en_ZA
dc.description.abstractThis were outlines the development of a general imaging model for use in autofocus, astigmatism correction, and resolution analysis. The model is based on the modulation transfer function of the imaging system in the presence of aberrations, in particular defocus. The extension of the model to include astigmatism is also included. The signals used are related to the ratios of the Fourier transforms of images captured under different operating conditions. Methods are developed for working with these signals in a consistent manner. The model described is then applied to the problem of autofocus. A general autofocus algorithm is presented and results given which reflect the predictive properties of this model. The imaging system used for the generation of results was a scanning electron microscope, although the conclusions should be valid across a far wider range of instruments. It is however the specific requirements of the SEM that make the generalisation presented here particularly useful.en_ZA
dc.identifier.apacitationNicolls, F. C. (1995). <i>The development of a predictive autofocus algorithm using a general image formation model</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/21760en_ZA
dc.identifier.chicagocitationNicolls, Frederick C. <i>"The development of a predictive autofocus algorithm using a general image formation model."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1995. http://hdl.handle.net/11427/21760en_ZA
dc.identifier.citationNicolls, F. 1995. The development of a predictive autofocus algorithm using a general image formation model. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Nicolls, Frederick C AB - This were outlines the development of a general imaging model for use in autofocus, astigmatism correction, and resolution analysis. The model is based on the modulation transfer function of the imaging system in the presence of aberrations, in particular defocus. The extension of the model to include astigmatism is also included. The signals used are related to the ratios of the Fourier transforms of images captured under different operating conditions. Methods are developed for working with these signals in a consistent manner. The model described is then applied to the problem of autofocus. A general autofocus algorithm is presented and results given which reflect the predictive properties of this model. The imaging system used for the generation of results was a scanning electron microscope, although the conclusions should be valid across a far wider range of instruments. It is however the specific requirements of the SEM that make the generalisation presented here particularly useful. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - The development of a predictive autofocus algorithm using a general image formation model TI - The development of a predictive autofocus algorithm using a general image formation model UR - http://hdl.handle.net/11427/21760 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21760
dc.identifier.vancouvercitationNicolls FC. The development of a predictive autofocus algorithm using a general image formation model. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21760en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleThe development of a predictive autofocus algorithm using a general image formation modelen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMSc (Eng)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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