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The objective of this step is to extract distinctive groups of pixels that are, to some extent, invariant to changing camera viewpoints during image acquisition, and to match all features between candidate image pairs.
Note
Requires Meshroom/AliceVision version 2023.3.0. See https://alicevision.org/#meshroom for information on how to download.
パラメータ ¶
Main ¶
Cook
Start the cooking process for this step.
Use Log
This toggle controls if the status of the current node should be printed to the console. This is useful for getting a quick overview of the progress.
Feature Extraction ¶
Describer Types
Describer types used to describe an image.
Describer Preset
Control the ImageDescriber configuration (low, medium, normal, high, ultra). Configuration “ultra” can take long time !
Force CPU Extraction
Use only CPU feature extraction.
Image Matching ¶
Min Number of Images
Minimal number of images to use the vocabulary tree. If we have less features than this threshold, we will compute all matching combinations.
Max Descriptors
Limit the number of descriptors you load per image. Zero means no limit.
Number of Matches
The number of matches to retrieve for each image (If 0 it will retrieve all the matches).
Feature Matching ¶
Describer Types
Describer types used to describe an image.
Photometric Matching Method
For Scalar based regions descriptor – ' BRUTE_FORCE_L2: L2 BruteForce matching'
' ANN_L2: L2 Approximate Nearest Neighbor matching'
' CASCADE_HASHING_L2: L2 Cascade Hashing matching'
' FAST_CASCADE_HASHING_L2: L2 Cascade Hashing with precomputed hashed regions (faster than CASCADE_HASHING_L2 but use more memory)
For Binary based descriptor – ' BRUTE_FORCE_HAMMING: BruteForce Hamming matching'
Geometric Error
Maximum error allowed for features matching during geometric verification.
Geometric Filter type
Geometric validation method to filter features matches.
Distance Ratio
Distance ratio to discard non meaningful matches.
Max Iteration
Maximum number of iterations allowed in ransac step.
Max Matches
Maximum number of matches to keep.
Save Putative Matches
Putative matches.
Guided Matches
The found model to improve the pairwise correspondences.
Export Debug Files
Debug files (svg, dot).
Environment ¶
Environment
The environment used for launching the AliceVision utilities command line. Note that this is a python expression and should be modified only through “Edit Expression”.
