add function initialize_edges() in gb() in segment-graph-multi.h, build 26-connect edges rather than 8-connect ones in v2 series
add offset in function initialize_edges() in edges.h, int offset = case_num * num_frame; divide 10 video clips into one unit and build graph, add offset with each smoothed image, e.g. smooth_r[z+offset], smooth_g[z+offset], otherwise all 8 threads build graph on the first 10 images, then segmentation fault in parallel
Add oversegmentation drawing function generate_output_s() in segment-graph-multi.h
Add oversegmentation drawing function generate_output_s() in segment-graph-multi.h