New PDF release: Affine Analysis of Image Sequences (Distinguished

By Larry S. Shapiro

ISBN-10: 0511526652

ISBN-13: 9780511526657

ISBN-10: 0521019788

ISBN-13: 9780521019781

ISBN-10: 0521550637

ISBN-13: 9780521550635

Machine imaginative and prescient is a speedily becoming box which goals to make desktops 'see' as successfully as people. during this publication Dr Shapiro offers a brand new laptop imaginative and prescient framework for analyzing time-varying imagery. this is often a tremendous activity, because move finds useful information regarding the surroundings. The fully-automated process operates on lengthy, monocular snapshot sequences containing a number of, independently-moving gadgets, and demonstrates the sensible feasibility of getting better scene constitution and movement in a bottom-up style. actual and artificial examples are given all through, with specific emphasis on photo coding purposes. Novel idea is derived within the context of the affine digital camera, a generalisation of the usual scaled orthographic version. research proceeds by way of monitoring 'corner beneficial properties' via successive frames and grouping the ensuing trajectories into inflexible items utilizing new clustering and outlier rejection recommendations. The three-d movement parameters are then computed through 'affine epipolar geometry', and 'affine constitution' is used to generate replacement perspectives of the thing and fill in partial perspectives. using all to be had good points (over a number of frames) and the incorporation of statistical noise homes considerably improves current algorithms, giving better reliability and lowered noise sensitivity.

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Extra resources for Affine Analysis of Image Sequences (Distinguished Dissertations in Computer Science)

Example text

18), Ax = M AX and Ax' = MA AX. 26) and e'- are the where e^ = MEj and e'- = M'Ej = MAEj. The image axis vectors projections of the world axis vectors Ej and E'-. They are 2D vectors lying in the image plane and are thus directly measurable. For instance, a simple affine frame is one defined by 3 The methods will indicate if the points are in fact planar, by having deficient rank. T h e affine c a m e r a and affine s t r u c t u r e 46 the 4 points themselves 4: { E i , E 2 , E 3 } = {AXi, AX 2 , A X 3 } .

G. e 3 = a 3 ei + /S3 e2). There are then only two independent columns in L, and the structure can be correctly recovered by using two image axes. Second, if the relative camera-object motion results in a pure affine transformation in the image plane, x^ = Fxj + e (where F and e are constant), then e'- = T et- and there are only two independent rows in L. This occurs, for instance, when there is pure translation parallel to the image plane or when rotation occurs only about the optic axis. In these cases, the object appears to be planar (even if it isn't), and whatever structure can be extracted from the available views will be extracted using two axis vectors.

G. videophones), it is useful to identify the background corners. e. computing the mean (s) and standard deviation (crs) of its speed over m frames, s= — m where s; = Juf + vf is the speed and (w,u) is the image velocity vector. 20(d)). Corner extraction and tracking 30 (b) (a) -. 18: (a) First frame in the "Curl" sequence (25 Hz); (b) 20t/l frame with 8-frame trajectories (true length) superimposed. Markers show final corner positions; (c)(d) Corners comprising the trajectories without and with forced matches (respectively).

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Affine Analysis of Image Sequences (Distinguished Dissertations in Computer Science) by Larry S. Shapiro


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