Investigation of High-Pass Filtering for Edge Detection in Optical Scanning Holography

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dc.contributor.authorZaman, Zayeem Habiben
dc.contributor.committeechairPoon, Ting Chungen
dc.contributor.committeememberXu, Yongen
dc.contributor.committeememberZhu, Yizhengen
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2023-10-17T08:00:13Zen
dc.date.available2023-10-17T08:00:13Zen
dc.date.issued2023-10-16en
dc.description.abstractHigh-pass filtering has been shown to be a promising method for edge detection in optical scanning holography. By using a circular function as a pupil for the system, the radius of the circle can be varied to block out different ranges of frequencies. Implementing this system in simulation yields an interesting result, however. As the radius increases, a singular edge can split off into two edges instead. To understand the specific conditions under which this split occurs, Airy pattern filtering and single-sided filtering were implemented to analyze the results from the original high-pass simulation. These methods were tested with different input objects to assess any common patterns. Ultimately, no definitive answer was found, as Airy pattern filtering resulted in inconsistent results across different input objects, and single-sided filtering does not completely isolate the edge. Nonetheless, the documented results may aid a future understanding of this phenomenon.en
dc.description.abstractgeneralHolograms are three-dimensional recordings of an object, reminiscent of how a photograph records a two-dimensional image of an object. Detecting edges in images and the reconstructed images from holograms can help us identify objects within the recorded image or hologram. In computer vision, common edge detection techniques involve analyzing the image's spatial frequency, or changes in relative intensity over space. One such technique is high-pass filtering, in which lower spatial frequencies are blocked out. High-pass filtering can also be applied to holographic imaging systems. However, when applying high-pass filtering to a holographic system, detected edges can split into two as higher frequencies are filtered out. This thesis examines the conditions for why this split-edge phenomenon occurs by modifying the original recorded object and the filtering mechanism, then analyzing the resultant holograms. While the results did not give a conclusive answer, they have been documented for the purpose of further research.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.othervt_gsexam:38489en
dc.identifier.urihttp://hdl.handle.net/10919/116484en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectoptical scanning holographyen
dc.subjectholographyen
dc.subjecthigh-pass filteringen
dc.subjectedge detectionen
dc.titleInvestigation of High-Pass Filtering for Edge Detection in Optical Scanning Holographyen
dc.typeThesisen
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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