Using over-sampled single-bit representation for velocity estimation in vision systems

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dc.contributor.authorNg, B.
dc.contributor.authorNguyen, S.
dc.contributor.conferenceSPIE Microelectronics MEMS and Nanotechology (2007 : ACT : Australia)
dc.contributor.editorDerek Abbott,
dc.date.issued2007
dc.description.abstractMachine vision has long been an important topic of study ever since electronic image sensors were developed. One of the main problems in machine vision is achieving a reliable estimate of velocity for objects of interest within the sensor’s visual field. Traditionally, estimating velocity based on full correlations has been impractical due to hefty computational requirements. As a result, most vision chips have adopted simplified models, such as the Reichardt correlator. With advances in digital microelectronics and mixed signal techniques, there appears to be an opportunity for the development of a velocity estimation chip which performs full correlation-based velocity estimates. This paper presents an algorithmic investigation into the feasibility of such a scheme. In our proposed approach, the image information is encoded using a non-linear, over-sampled single-bit representation. Correlation computations are performed on this over-sampled signal, with the reduced precision of the singlebit representation providing a trade-off against the increased sampling rate. The quality of the achievable velocity estimates are evaluated against correlators operating on conventional image sensors, using rotated natural panoramic image sequences as input. Preliminary results suggest the proposed scheme to provide a reasonable estimations of velocity, with the potential advantage of requiring very simple logical circuits.
dc.description.statementofresponsibilityB. W.-H. Ng & S. T. Nguyen
dc.identifier.citationProceedings of SPIE 6798, Microelectronics: Design, Technology and Packaging III, 67980V, Canberra, ACT, Australia 4-7 December, 2007/ Alex J. Hariz, Vijay K. Varadan (eds.): 5 p.
dc.identifier.doi10.1117/12.759329
dc.identifier.isbn9780819469694
dc.identifier.issn0277-786X
dc.identifier.issn1996-756X
dc.identifier.orcidNg, B. [0000-0002-8316-4996]
dc.identifier.urihttp://hdl.handle.net/2440/47655
dc.language.isoen
dc.publisherSPIE
dc.publisher.placeCDROM
dc.relation.ispartofseriesProceedings of SPIE
dc.source.urihttps://doi.org/10.1117/12.759329
dc.subjectMachine vision
dc.subjectvelocity estimation
dc.subjectcorrelation
dc.subjectmulti-rate signal processing
dc.subjectsigma-delta converters
dc.subjectimage processing
dc.titleUsing over-sampled single-bit representation for velocity estimation in vision systems
dc.typeConference paper
pubs.publication-statusPublished

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