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Pointing Based Object Localization

Pointing Based Object Localization. CS223b Final Project Stanford University Bio-Robotics Lab Paul Nangeroni & Ashley Wellman March 17, 2008. ( Motivation ). Present robotic object detection relies on dense stereo mapping of 3D environments

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Pointing Based Object Localization

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  1. Pointing Based Object Localization CS223b Final Project Stanford University Bio-Robotics Lab Paul Nangeroni & Ashley Wellman March 17, 2008

  2. ( Motivation ) • Present robotic object detection relies on dense stereo mapping of 3D environments • Pointing based object localization is an intuitive interface for improving accuracy of object detectors • Project represents several advances over prior art • Uses actual human line of sight (eye through fingertip) • Works in cluttered background • Detects objects in free space. Stanford University Bio-Robotics Lab

  3. ( Approach: Face Detection )

  4. ( Approach: Stereopsis ) Step 1: Warp Images along epilines of eye and fingertip in left image Step 2: Use NCC along epilines to find the matching eye and fingertip in right image Step 3: Project eye and fingertip locations into 3D Step 4: Resolve errors in projection via least squares Step 5: Create line of sight vector. - object known to exist on that line Stanford University Bio-Robotics Lab

  5. ( Approach: Stereopsis ) Step 6: Reproject actual eye and fingertip positions back into 2D Reprojected Pts NCC pts Step 7: Rotate images along line of sight and create a slice from the fingertip to the edge of the image SIFT matches Step 8: Apply SIFT and RANSAC to the slice RANSAC matches Step 9: locate the target object by selecting the match point closest to the centerline of the slice Minimum norm from line of sight Target Object Step 10: Project the point into 3D and find the closest point along the known line of sight. This point is the location of the target object RANSAC pt Stanford University Bio-Robotics Lab

  6. ( Results + Future Work ) • Conclusions • World coordinates output from stereo accurate to within 3cm at range of 2.5m • Face and finger detection needs more training • Object localization sensitive to background clutter • Object location often at edge or corner rather than centroid of object itself • Future Work • Object location used to center high resolution close-up for improved accuracy and efficiency • Laser will highlight target object before robotic arm attempts to grasp Stanford University Bio-Robotics Lab

  7. ( Breakdown of work ) • Paul (60%) • Stereo Calibration, Stereopsis, Object Localization • Ashley (40%) • Eye Detection, Fingertip Detection Stanford University Bio-Robotics Lab

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