Download Active Contours: The Application of Techniques from by Andrew Blake PDF

Graphics Multimedia

By Andrew Blake

ISBN-10: 1447115570

ISBN-13: 9781447115571

Active Contours bargains with the research of relocating photos - a subject matter of starting to be value in the special effects undefined. specifically it really is interested by figuring out, specifying and studying previous types of various power and utilising them to dynamic contours. Its objective is to boost and examine those modelling instruments extensive and inside of a constant framework.

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Additional info for Active Contours: The Application of Techniques from Graphics, Vision, Control Theory and Statistics to Visual Tracking of Shapes in Motion

Sample text

Knowing 36 Chapter 2 initial conditions, any subsequent observation of the pendulum is redundant. Realistic visual tracking problems are more like observing a pendulum oscillating in a turbulent airflow. The mean behaviour of the pendulum may be explained as deterministic simple harmonic motion, but the airflow drives the motion with random external forces. 3) where X and X are the first and second temporal derivatives of X and w is a random disturbance. Thus the value of initial conditions weaken over time, as the motion of the pendulum is progressively perturbed away from the ideal deterministic motion.

The original snake 30 Chapter 2 represented r(s) by a sequence of samples at S = Si, i = 1, ... ,N, spaced at intervals of leIlgth h, and used "finite differences" to approximate the spatial derivatives r sand rss by and solve the resulting simultaneous equations in the variables r(sl), ... ,r(sN)' The system of equations is "sparse," so that it can be solved efficiently, in time O(N) in fact. In finite difference approximations, the variables r(si) are samples of the curve r(s), at certain discrete points, conveying no information about curve shape between samples.

1996). , 1994). A pioneering advance in the visual tracking of human motion was Hogg's "Walker" (Hogg, 1983) which used an articulated model of limb motion to constrain search for body parts. , 1993). Audio-visual speech analysis, or speech-reading, has been the subject of psychological study for some time (Dodd and Campbell, 1987). , 1992). g. (Adjoudani and Benoit, 1995). , 1994). The technique of rotoscoping allows film-makers to transfer a complex object from one image sequence to another.

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