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Research Report CS-RR-200

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K. Langley, D. Fleet and T.J. Atherton, An Instantaneous Frequency-Based Computation of Transparent Motion (November 1, 1991).

Abstract

We extend the principle of phase-based techniques for measuring optical flow and binocular disparity to multiple motion estimation. Using quadrature filter pairs, we estimate phase gradients (instantaneous frequency) from independent bandpass channels, which we apply towards the problem of multiple optic flow analysis. Our approach is similar to that of Shizawa and Mase [23], in which nth-order differential operators are required to compute n simultaneous velocity estimates. The approach presented here is simpler, however, because we require only a set of band-pass filters, the out-puts of which need only be differentiated once. Thus, the present technique requires only first-order filters. Additionally, this theory is also applicable to transparency in stereopsis.

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