New: The BSDS500, an extended version of the BSDS300 that includes 200 fresh test images, is now available here. The goal of this work is to provide an empirical basis for research on image segmentation and boundary detection. To this end, we have collected 12,000 hand-labeled segmentations of 1,000 Corel dataset images from 30 human subjects. Half of the segmentations were obtained from present