Adds Dense SIFT feature type. http://www.vlfeat.org/overview/dsift.html #236
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Hi,
vl/dsift.h is already present in opensfm/src/third_party/vlfeat/vl/dsift.h
They are not part of this pull req.
…-sashi.
On Fri, Apr 20, 2018 at 8:39 PM, Russ ***@***.***> wrote:
***@***.**** commented on this pull request.
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In opensfm/src/dsift.cc
<#236 (comment)>:
> @@ -0,0 +1,52 @@
+#include "types.h"
+#include "dsift.h"
+
+#include <vector>
+#include <iostream>
+
+extern "C" {
+ #include "vl/dsift.h"
Are these files included in the pull req?
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Hi @sashichandra, sorry I deleted my comment after I found the file. |
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Is there a chance you could resolve the conflict in the features.py file @sashichandra ? @paulinus are you willing to merge this? Otherwise I'll pull this into my own working copy. |
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@russkel, I've resolved the conflicts on this branch and put the result in this branch https://github.com/paulinus/OpenSfM/tree/sashichandra-dsift About merging it to master, the main concern is that Dense SIFT is not a suitable feature for SfM in general. The reason for that is that it extracts features on a fixed grid that is not adapted to the actual image texture. As a result, corresponding features in different images are not centered around the same real-world point. This adds substantial error to triangulation and resection algorithms to the point where they no longer work. Testing this branch on berlin and lund dataset, I was unable to get good reconstructions. Only berlin yield a reasonable reconstruction after setting If there is a trick to make things work better, please let me know. |
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