ErlerPhilipp
commented
1 year ago FeatureExtraction Force CPU Extraction: try without, might be unstable, try with SIFT describer type Describer types: Here is a survey paper https://research-repository.griffith.edu.au/bitstream/10072/419561/2/Zhang3477189-Accepted.pdf multiple describer types: dsp-sift + akaze? select the same in the following nodes Describer Preset: speed-quality tradeoff, try high
ImageMatching check voctree vs sequential vs exhaustive only 100 images -> exhaustive ok? min for voc tree, sequential neighbors; max descriptors 0, Nb matches 0
FeatureMatching check matching methods: brute force vs heuristics geometric estimator and filter types guided matching? cascade hashing l2; guided matching, cross matching, known poses geometric error max 0
StructureFromMotion localizer estimator Observation Constraint (Scaling on) disable Use Rig Constraint
PrepareDenseScene disable save meta data? Correct images exposure?
Depth Map downscale 1? (longer meshing)
Depth Map Filter number of nearest cameras 10 -> 15?
SfM Transform Apply Editor transformations (check if non-uniform scaling is supported)
Meshing try to get it faster, even if it costs some quality use custom bounding box from editor min step 1 margin init (final) coef 1 densify front/back 5 colorize output (vertex colors?) save raw dense point cloud max points (per voxel): reduce for speed? Min Observations Angle For SfM Space Estimation: filter uninteresting remote areas
Mesh Filtering less smoothing?
Mesh Decimation target faces <= 600k (LSCM) or 300k (ABF), matching the texturing>unwrap method
Texturing try to get it faster, even if it costs some quality. prefer smaller files. texture side and downscale (multi-band?) Subdiv Target Ratio? unwrap method: check number of faces, ABF if it doesn't take too long, else LSCM, else basic correct exposure?
Meshroom / AliceVision has many parameters for each step. We need to find out which ones are crucial and find some good settings for our application. The focus is on speed, and quality second. Let's try to get the best possible quality within ~20 min compute time.
The most relevant steps to speed up are meshing and texturing.
Read this: https://sketchfab.com/blogs/community/tutorial-meshroom-for-beginners/