{"action":"created","issue":{"url":"https://api.github.com/repos/openMVG/openMVG/issues/822","repository_url":"https://api.github.com/repos/openMVG/openMVG","labels_url":"https://api.github.com/repos/openMVG/openMVG/issues/822/labels{/name}","comments_url":"https://api.github.com/repos/openMVG/openMVG/issues/822/comments","events_url":"https://api.github.com/repos/openMVG/openMVG/issues/822/events","html_url":"https://github.com/openMVG/openMVG/issues/822","id":214845405,"number":822,"title":"use of GPS info in openMVG","user":{"login":"ywjia","id":25944524,"avatar_url":"https://avatars2.githubusercontent.com/u/25944524?v=3","gravatar_id":"","url":"https://api.github.com/users/ywjia","html_url":"https://github.com/ywjia","followers_url":"https://api.github.com/users/ywjia/followers","following_url":"https://api.github.com/users/ywjia/following{/other_user}","gists_url":"https://api.github.com/users/ywjia/gists{/gist_id}","starred_url":"https://api.github.com/users/ywjia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/ywjia/subscriptions","organizations_url":"https://api.github.com/users/ywjia/orgs","repos_url":"https://api.github.com/users/ywjia/repos","events_url":"https://api.github.com/users/ywjia/events{/privacy}","received_events_url":"https://api.github.com/users/ywjia/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":7,"created_at":"2017-03-16T21:34:40Z","updated_at":"2017-03-22T19:04:27Z","closed_at":null,"body":"Hi, I have a question about using GPS prior (from exif) in openMVG. \r\n\r\nI understand from the document that the syntax / pipeline of using GPS prior should look like the following (only listed relevant parameters):\r\n\r\n(1) openMVG_main_SfMInit_ImageListing -P -W w0 w1 w2 ...\r\n(2) openMVG_main_ComputeFeatures  ...\r\n(3) openMVG_main_ListMatchingPairs -G -n limit_num_of_pairs -o match_dir/pair_list.txt ...\r\n(4) openMVG_main_ComputeMatches -l match_dir/pair_list.txt ...\r\n(5) openMVG_main_IncrementalSfM -P ...\r\n\r\nAfter that, I can use the following to generate dense point cloud.\r\n\r\n(6) openMVG_main_openMVG2openMVS -i recon_dir/sfm_data.bin -o recon_dir/scene.mvs -d ./undisto\r\n(7) DensifyPointCloud -i recon_dir/scene.mvs -o recondir/scene_dense.ply\r\n\r\nIn comparing with the dense point cloud generated without using GPS prior, the output from the above process is noticeably sparser. I understand that by using GPS prior, the process is constrained and hence fewer points. However, even if I set w0=w1=w2=0.0 (which supposes to give 0 weight to GPS prior), and set limit_num_of_pairs to a large number (say, 1024, more than the number of images), the result stays the same. This really puzzles me since I thought the above setting should be equivalent to not using GPS prior at all.\r\n\r\nMoreover, the dense point cloud generated using GPS prior contains some strange patterns of lines, and after subsequent processing (ReconstructMesh and TextureMesh), the result contains significantly less details.\r\n\r\nAny ideas of what the issue is, please?\r\n\r\nThanks."},"comment":{"url":"https://api.github.com/repos/openMVG/openMVG/issues/comments/288506065","html_url":"https://github.com/openMVG/openMVG/issues/822#issuecomment-288506065","issue_url":"https://api.github.com/repos/openMVG/openMVG/issues/822","id":288506065,"user":{"login":"pmoulon","id":3235050,"avatar_url":"https://avatars2.githubusercontent.com/u/3235050?v=3","gravatar_id":"","url":"https://api.github.com/users/pmoulon","html_url":"https://github.com/pmoulon","followers_url":"https://api.github.com/users/pmoulon/followers","following_url":"https://api.github.com/users/pmoulon/following{/other_user}","gists_url":"https://api.github.com/users/pmoulon/gists{/gist_id}","starred_url":"https://api.github.com/users/pmoulon/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pmoulon/subscriptions","organizations_url":"https://api.github.com/users/pmoulon/orgs","repos_url":"https://api.github.com/users/pmoulon/repos","events_url":"https://api.github.com/users/pmoulon/events{/privacy}","received_events_url":"https://api.github.com/users/pmoulon/received_events","type":"User","site_admin":false},"created_at":"2017-03-22T19:04:27Z","updated_at":"2017-03-22T19:04:27Z","body":"@ywjia \r\nWe could think about to add a tool to normalize a scene (according a reference image or just a global normalization). Any though about that?\r\n\r\nWe can also integrate your lla_to_neu transform."}}
{"actor":{"display_login":"pmoulon"}}