TAILIEUCHUNG - Visual motion

To help you specialized culture and art have added references in the process of learning and study. Invite you to consult the lecture content "Visual motion". Each of your content and references for additional lectures will serve the needs of learning and research. | Visual motion Many slides adapted from S. Seitz, R. Szeliski, M. Pollefeys Motion and perceptual organization Sometimes, motion is the only cue Motion and perceptual organization Sometimes, motion is the only cue Motion and perceptual organization Even “impoverished” motion data can evoke a strong percept G. Johansson, “Visual Perception of Biological Motion and a Model For Its Analysis", Perception and Psychophysics 14, 201-211, 1973. Motion and perceptual organization Even “impoverished” motion data can evoke a strong percept G. Johansson, “Visual Perception of Biological Motion and a Model For Its Analysis", Perception and Psychophysics 14, 201-211, 1973. Motion and perceptual organization Even “impoverished” motion data can evoke a strong percept G. Johansson, “Visual Perception of Biological Motion and a Model For Its Analysis", Perception and Psychophysics 14, 201-211, 1973. Uses of motion Estimating 3D structure Segmenting objects based on motion cues Learning and tracking dynamical models Recognizing events and activities Motion field The motion field is the projection of the 3D scene motion into the image Motion field and parallax X(t) is a moving 3D point Velocity of scene point: V = dX/dt x(t) = (x(t),y(t)) is the projection of X in the image Apparent velocity v in the image: given by components vx = dx/dt and vy = dy/dt These components are known as the motion field of the image x(t) x(t+dt) X(t) X(t+dt) V v Motion field and parallax x(t) x(t+dt) X(t) X(t+dt) V v To find image velocity v, differentiate x=(x,y) with respect to t (using quotient rule): Image motion is a function of both the 3D motion (V) and the depth of the 3D point (Z) Quotient rule for differentiation: D(f/g) = (g f’ – g’ f)/g^2 Motion field and parallax Pure translation: V is constant everywhere Motion field and parallax Pure translation: V is constant everywhere The length of the motion vectors is inversely proportional to the depth Z

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