MULTI_VIEW performs multi-view projective reconstruction. Input: x - image points (3xnxm) depth - initial depths of points from two-view (1xn) Options: 'K', K - calibration matrix (3x3) 'calibrated' - indicates the camera is calibrated 'visibility', vis - visibility map (nxm) 'visualize' - visualize intermediate reconstruction status Output: Xp - 3d locations of points (4xn) Pp - projection matrices (3x4xm) x_ - normalized image points (3xnxm) vis - updated visibility map (nxm) NOTE: We assume tvl_hat the points in the first image are never outliers.