?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Integrated+2-D+Optical+Flow+Sensor&rft.creator=Stocker%2C+Dr.+Alan&rft.subject=Computational+Neuroscience&rft.subject=Machine+Vision&rft.subject=Robotics&rft.description=I+present+a+new+focal-plane+analog+VLSI+sensor+that+estimates+optical+flow+in+two+visual+dimensions.+The+chip+significantly+improves+previous+approaches+both+with+respect+to+the+applied+model+of+optical+flow+estimation+as+well+as+the+actual+hardware+implementation.+Its+distributed+computational+architecture+consists+of+an+array+of+locally+connected+motion+units+that+collectively+solve+for+the+unique+optimal+optical+flow+estimate.+The+novel+gradient-based+motion+model+assumes+visual+motion+to+be+translational%2C+smooth+and+biased.+The+model+guarantees+that+the+estimation+problem+is+computationally+well-posed+regardless+of+the+visual+input.+Model+parameters+can+be+globally+adjusted%2C+leading+to+a+rich+output+behavior.+Varying+the+smoothness+strength%2C+for+example%2C+can+provide+a+continuous+spectrum+of+motion+estimates%2C+ranging+from+normal+to+global+optical+flow.+Unlike+approaches+that+rely+on+the+explicit+matching+of+brightness+edges+in+space+or+time%2C+the+applied+gradient-based+model+assures+spatiotemporal+continuity+on+visual+information.+The+non-linear+coupling+of+the+individual+motion+units+improves+the+resulting+optical+flow+estimate+because+it+reduces+spatial+smoothing+across+large+velocity+differences.+Extended+measurements+of+a+30x30+array+prototype+sensor+under+real-world+conditions+demonstrate+the+validity+of+the+model+and+the+robustness+and+functionality+of+the+implementation.+&rft.date=2004-01&rft.type=Preprint&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F3377%2F1%2FStocker2004a.pdf&rft.identifier=++Stocker%2C+Dr.+Alan++(2004)+Integrated+2-D+Optical+Flow+Sensor.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F3377%2F