COLMAP merges DEGENSAC into main RANSAC, boosting plane-heavy scenes

ducha_aiki · x · 2026-07-23

COLMAP has merged a new DEGENSAC option into its RANSAC pipeline.

• The change helps on plane-dominant scenes while leaving general cases essentially unchanged.
• In a large evaluation, turning DEGENSAC on improved global reconstruction metrics, with especially large gains on scenes like terrains and boulders.
• On a real south-building dataset, the post says the practical difference is negligible because the scene already reconstructs well without it.
• Verification over 4,210 image pairs showed slightly more inlier matches, about 1.1× verification wall time, and a 1.7× per-pair DEGENSAC cost that was reduced to roughly 10% higher overall after optimization.
• The analysis explains that DEGENSAC only changes the F estimate, so many config flips come from inlier-count threshold crossings around calibrated / uncalibrated and planar / panoramic decisions.

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