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Performance of passive ranging from image flow | IEEE Conference Publication | IEEE Xplore
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Performance of passive ranging from image flow


Abstract:

The accuracy of passive ranging derived from image flow is investigated for potential use in air vehicles. By using the optical flow constraint, a closed form expression ...Show More

Abstract:

The accuracy of passive ranging derived from image flow is investigated for potential use in air vehicles. By using the optical flow constraint, a closed form expression for range at each pixel is obtained directly from spatial-temporal gradients of the image intensity, the pixel location, and the known egomotion. Gradient estimation is performed with a space/time Sobel mask, and a local median filter is employed for rejection of outliers due to algorithm singularities. The filtered range image is smoothed by a two-state Kalman filter. Simulation results employing this range estimator in translation and rotational camera motion situations are promising and appear suitable for air vehicle applications. Scenarios where large inter-frame pixel motion degrades the ranging accuracy are discussed.
Date of Conference: 14-17 September 2003
Date Added to IEEE Xplore: 24 November 2003
Print ISBN:0-7803-7750-8
Print ISSN: 1522-4880
Conference Location: Barcelona, Spain