Measurement of Image Velocity by David J. Fleet (auth.)

By David J. Fleet (auth.)

Measurement of photograph Velocity provides a computational framework for computing movement info from sequences of pictures. Its particular objective is the size of picture speed (or optical flow), the projection of 3D item movement onto the 2-D photograph aircraft.
The formula of the matter emphasizes the geometric and photometric houses of picture formation, and the incidence of a number of photograph velocities triggered, for instance, by way of specular reflections, shadows, or transparency. the tactic proposed for measuring picture pace relies at the part habit within the output of velocity-tuned filters. vast experimental paintings is used to teach that part could be a trustworthy resource of natural photo translation, small geometric deformation, delicate distinction diversifications, and a number of neighborhood velocities. broad theorectical research is used to provide an explanation for the robustness of section with recognize to deviations from snapshot translation, and to observe events within which part turns into volatile. the implications point out that optical movement should be extracted reliably for computing egomotion and constitution from movement.
The monograph additionally includes a evaluation of alternative recommendations and frequency research utilized to snapshot sequences, and it discusses the heavily comparable subject matters of zero-crossing monitoring, gradient-based tools, and the dimension of binocular disparity. The paintings is appropriate to these learning computing device imaginative and prescient and visible belief.

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2 if the k2 -axis is replaced by the w-axis. 0). 0). 8 octaves, this process eventually yields 23 filter types: 6 tuned to speeds about 0 with preferred directions at multiples of 30 degrees; 10 tuned to speeds of 1/v'3 with directions at every 36 degrees; 6 tuned to speeds of v'3 with directions every 60 degrees; and a flicker channel tuned to non-zero temporal frequencies and zero spatial frequency [Fleet, 1988]. We now consider the discrete sampling of the output of a single filter type. 4).

2) yields the normal velocity of level contours of constant intensity, Vn = vnn, where n is the direction of the spatial intensity gradient. 3) is that the two components of the 2-d velocity v are constrained by only one linear equation. Further constraints are therefore necessary to determine both elements of v. , 1989]. 4) also follows from the assumption that" I(x, t) is conserved: = o. 2). 2) and other differential constraints to yield an over-determined system of linear equations. e. if the intensity function is effectively one-dimensional), then because of the sensitivity of numerical differentiation, we cannot expect to obtain secondorder derivatives accurately enough to determine the tangential component of v reliably.

This means, for example, that smaller windows should be used to measure fine scale structure. In terms of the amplitude spectra, this constraint means that the filters should be bandpass, with relatively narrow frequency pass-bands. Moreover, it is consonant with other arguments for scale-specific filters with constant octave bandwidths, often referred to as wavelets [Burt and Adelson, 1983; Koenderink, 1984; Crowley and Parker, 1984; Mallat, 1989]. 1, Conditions 2 and 3 call for concentration of the amplitude spectrum in the frequency domain.

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