1. A computer-implemented method for image segmentation, comprising: receiving images captured by cameras in a camera array; determining dense correspondences between pairs of the images captured at the same time by two or more cameras in the camera array; computing one or more pseudo depth maps from the dense correspondences, wherein pseudo depths in each of the pseudo depth maps indicate relative depths of pixels with respect to other pixels in the pseudo depth map but not actual depth measurements; and segmenting one or more of the images based on the computed pseudo depth maps.