Segmentation
Image segmentation that isolates the regions to inspect.
Graph-based Segmentation
Graph-based segmentation algorithms such as GraphCut and Random Walker.
Region-based Segmentation
Region-expansion segmentation such as Watershed and Region Growing.
Level Set
Level-set segmentation that converges by propagating a boundary surface.
Feature Extraction
Extracts the shape and feature information that inspection decisions are based on.
Blob Analysis
Blob detection, feature extraction, and separation of touching blobs.
Contour Analysis
Contour extraction and shape feature analysis.
Feature Point Detection
Feature point detection and descriptor computation.
Alignment
Matching and registration — aligns inspection images to reference shapes and volumes.
Matching
Template matching, geometric shape matching, and feature point matching.
Image 2D-3D Registration
Registers a 3D volume to 2D images by projecting it through the X-ray geometry (DRR), using geometric parameters such as projection offsets, SID/SDD, and rotation directly as optimization variables.
Transform Models
Transform models selected step by step — from 2D/3D rigid, similarity, and affine to B-spline and displacement fields (free-form deformation).
Similarity Metrics
Similarity measures matched to modality and image characteristics — mutual information, normalized cross-correlation (NCC), mean squared error, and more.
Optimization
Optimizers including L-BFGS-B, Levenberg-Marquardt, and Powell, with multi-start, robust loss (Huber, IRLS), and multi-resolution strategies.
Point Set Registration
2D/3D point-set registration with phantom pose estimation, and non-rigid point-set registration such as board warpage.
Demons · Phase Correlation
Demons non-rigid registration, fast FFT-based estimation of shift, rotation, and scale, and sub-pixel registration based on feature point patches.
Classification
Inspection judgment and classification using the extracted features.
Feature-based Classification
Judgment and classification using segmentation and feature extraction results.
DL-linked Classification
Judgment linked with deep learning classification models. Details are covered in the AI & Deep Learning module.
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