WICED 2017

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https://diglib.eg.org/handle/10.2312/2631243

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Browsing WICED 2017 by Subject "I.4.8 Scene Analysis"

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    CaMor: Screw Interpolation between Perspective Projections of Partial Views of Rectangular Images
    (The Eurographics Association, 2017) Raghuraman, Gokul; Barrash, Nicholas; Rossignac, Jarek; William Bares and Vineet Gandhi and Quentin Galvane and Remi Ronfard
    CaMor is a tool for generating an animation from a single drawing or photograph that represents a partial view of a perspective projection of a planar shape or image that contains portions of only 3 edges of an unknown rectangle. The user identifies these portions and indicates where the corresponding lines should be at the end of the animation. CaMor produces a non-affine animation of the entire plane by combining (1) a new rectification procedure that identifies the orientation in 3D of a rectangle from the partial image of its perspective projection, (2) a depth adjustment that ensures that the two rectified rectangles are congruent in 3D, (3) a screw motion that interpolates in 3D between the two congruent shapes, and (4) at each frame, a perspective projection of a user-selected portion of the original image. The animation may be modified interactively by adjusting the final positions of the lines or the focal length. We suggest applications to the animation of hand-drawn scenes, to the morph between two photographs, and to the intuitive design of camera motions for indoor and street scenes.
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    La Caméra Enchantée
    (The Eurographics Association, 2017) Rossignac, Jarek; William Bares and Vineet Gandhi and Quentin Galvane and Remi Ronfard
    A rich set of tools have been developed for designing and animating camera motions. Most of them optimize some geometric measure while satisfying a set of geometric constraints. Others strive to provide an intuitive graphical user interface for manipulating the camera motion or the key poses that control it. We will start by reviewing examples of such tools developed by the speaker and his collaborators and students. These include a 6 DoF GUI for moving a MiniCam over a floor plan of the set, arguing the benefits of Screw Motions for interpolation key poses, using HelBender to smoothen piecewise helical interpolating motions, and controlling the camera by moving on the screen the location of feature points tracked by the camera, and scene graph extensions that support smooth transitions between tracked objects. Then, we will ask harder questions: What is the best way for the user to specify the objectives, the constraints, and the camera motion style? How do we define and program such a style? Is the objective to make the motion so natural that it is not noticed by the viewer or is should we strive to support aesthetic qualities and artistic camera actions? And finally, how do we define and program responsive camera behaviors for interactive environments? Author's prior publications referenced in the talk include: [SBM 95], [RK01], [KR03], [PR05], [RKS 07], [PR08], [RS08], [RV11], [RK12], [RLV12].