Visual Odometry Chris Moore Mark Huetsch Firouzeh Jalilian

Problem: Estimate camera motion Estimate trajectory of a vehicle which captured sequence of images from all four sides

Approach 1.Compute SIFT features for a stream of frames from a camera 2.Set a window size for the number of consecutive images to handle at a time 3.For each window of n frames a)For first 2 frames I.Find corresponding SIFT features (rough correspondences) II.Calculate essential matrix using RANSAC to discard inaccurate correspondences III.Decompose essential matrix into rotation and translation, and calculate sparse 3D structure (Can only find translation and structure calculate up to a scale!) b)For later frames i=3…n I.Find rough SIFT correspondences between frame i and frame 1 II.Calculate motion from frame 1 to frame i using 3D structure computed in a c)Use sparse bundle adjustment on all frames in window to refine camera motions and calculate scale 4.Advance the window by 1 frame, repeat step 3

Result: SIFT matches SIFT features matched and inliers identified using RANSAC

Improvements Gaussian convolution of produced data- points Self-tuning of RANSAC parameters More intelligent sliding window for bundle adjustment

Hidden Slide Chris 40% Mark 30% Firouzeh 30%