Bundler from GUI results in good image/point alignment, yet Bundler from commandline does not.

[jerb...@gmail.com]

If I walk through the steps in the GUI to create a dense pointcloud, from initial DB creation all the way to Fusion, I can Export Model As a Bundler (.out + .txt) file set and when I bring these into Meshlab, the images line up with the pointcloud.

However, when I run the script (command line), although the pointcloud looks fine, the images seem to be zoomed in, and are not aligned properly. This creates a problem for me in a few areas, including when I need to project the photos as a texture onto the resulting mesh.

Thoughts?

proper alignment shown in screencap of Meshlab

Bundler file set created from GUI

misalignment shown in screencap of Meshlab

Bundler file set created from attached command line script

#####################

## script

#####################

DATASET_PATH=$DATASET_TOP_PATH/01_face
echo $DATASET_PATH
colmap feature_extractor \
    --database_path $DATASET_PATH/db.db \
    --image_path $DATASET_PATH

colmap exhaustive_matcher \
    --database_path $DATASET_PATH/db.db

mkdir $DATASET_PATH/sparse

colmap mapper \
    --database_path $DATASET_PATH/db.db \
    --image_path $DATASET_PATH \
    --export_path $DATASET_PATH/sparse

mkdir $DATASET_PATH/dense

colmap image_undistorter \
    --image_path $DATASET_PATH \
    --input_path $DATASET_PATH/sparse/0 \
    --output_path $DATASET_PATH/dense \
    --output_type COLMAP \
    --max_image_size 2000

colmap dense_stereo \
    --workspace_path $DATASET_PATH/dense \
    --workspace_format COLMAP \
    --DenseStereo.geom_consistency true

colmap dense_fuser \
    --workspace_path $DATASET_PATH/dense \
    --workspace_format COLMAP \
    --input_type geometric \
    --output_path $DATASET_PATH/dense/fused.ply

colmap model_converter --input_path $DATASET_PATH/sparse/0 --output_path $DATASET_PATH/dense/images/cmdLine_export.nvm --output_type nvm
colmap model_converter --input_path $DATASET_PATH/sparse/0 --output_path $DATASET_PATH/dense/images/cmdLine_export.out --output_type bundler

[Johannes Schönberger]

You are converting the distorted sparse reconstruction to the bundler format. But your are loading the undistorted dense reconstruction. You can resolve the issue by converting the “dense/sparse/” folder.

On 10 Sep 2018, at 20:52, jerb...@gmail.com wrote:

If I walk through the steps in the GUI to create a dense pointcloud, from initial DB creation all the way to Fusion, I can Export Model As a Bundler (.out + .txt) file set and when I bring these into Meshlab, the images line up with the pointcloud.

However, when I run the script (command line), although the pointcloud looks fine, the images seem to be zoomed in, and are not aligned properly. This creates a problem for me in a few areas, including when I need to project the photos as a texture onto the resulting mesh.

Thoughts?

proper alignment shown in screencap of Meshlab

Bundler file set created from GUI

<GUI_aligned.jpg>

misalignment shown in screencap of Meshlab

Bundler file set created from attached command line script

<commandline_misaligned.jpg>

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<GUI_aligned.jpg>

<commandline_misaligned.jpg>

[Jeremy Bot]

Ah! Of course.  That makes sense.  Will take a look at this later today and share results. Thank you for the reply! 

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[jerb...@gmail.com]

Sorry for the delay, I had to re-install colmap due to system problems, and seems that colmap went through a bit of an upgrade which broke my scripts.  All is fixed now with my scripts...

...included the changes you recommended, and my problem is FIXED!! The photos and points are lining up.

Thank you!

- Jer