Update README.md

README.md

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----
-license: mit
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+---
+license: mit
+---
+Fastmap evaluation suite. 
+
+## Images 
+We performed some light image curation 
+
+## Databases
+Unless specified below, all databases `.db` files are produced with 
+```
+colmap feature_extractor --ImageReader.single_camera 1 --ImageReader.camera_model SIMPLE_RADIAL --image_path {imgdir} --database_path {db_fname}
+colmap exhaustive_matcher --database_path {db_fname}
+```
+
+For nerf-osr (i.e. those with prefix `nosr_`), `dploy_house4`, urbanscene (`urbn_`), eyeful tower (`eft_`), 
+we use `--ImageReader.single_camera 0`. 
+
+For eth3d MVS (`eth3d_dslr_`), we populate the databases with author provided ground truth camera intrinsics. 
+This is to keep the eval protocol consistent with Glomap. see [issue 96](https://github.com/colmap/glomap/issues/96).
+
+
+## Ground truths
+
+We use two types of ground-truth formats. The first is colmap `.bin` output. 
+Secondly, for datasets whose ground truths come in non-standard format, we verify and convert them to a white-box json file each containing a list of `{fname: str, c2w: list[float]}`. 
+The `c2w` matrix is in OpenCV convention.
+
+
+
+