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General Image Processing

OpenCV: (C/C++ code, BSD lic) Image manipulation, matrix manipulation, transforms
Torch3Vision: (C/C++ code, BSD lic) Basic image processing, matrix manipulation and feature extraction algorithms: rotation, flip, photometric normalisations (Histogram Equalization, Multiscale Retinex, Self-Quotient Image or Gross-Brajovic), edge detection, 2D DCT, 2D FFT, 2D Gabor, PCA to do Eigen-Faces, LDA to do Fisher-Faces. Various metrics (Euclidean, Mahanalobis, ChiSquare, NormalizeCorrelation, TangentDistance, ...)
GradientShop: (C/C++ code, GPL lic) GradientShop: A Gradient-Domain Optimization Framework for Image and Video Filtering
ImLab: (C/C++ code, MIT lic) A Free Experimental System for Image Processing (loading, transforms, filters, histogram, morphology, ...)
CIMG: (C/C++ code, GPL and LGPL lic) CImg Library is an open source C++ toolkit for image processing
Generic Image Library (GIL) - boost integration: (C/C++ code, MIT lic) Adobe open source C++ Generic Image Library (GIL)

Image Acquisition, Decoding & encoding

FFMPEG: (C/C++ code, LGPL or GPL lic) Record, convert and stream audio and video (lot of codec)
OpenCV: (C/C++ code, BSD lic) PNG, JPEG,... images, avi video files, USB webcam,...
Torch3Vision: (C/C++ code, BSD lic) Video file decoding/encoding (ffmpeg integration), image capture from a frame grabber or from USB, Sony pan/tilt/zoom camera control using VISCA interface
lib VLC: (C/C++ code, GPL lic) Used by VLC player: record, convert and stream audio and video
Live555: (C/C++ code, LGPL lic) RTSP streams
ImageMagick: (C/C++ code, GPL lic) Loading & saving DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, TIFF, and more
DevIL: (C/C++ code, LGPL lic) Loading & saving various image format
FreeImage: (C/C++ code, GPL & FPL lic) PNG, BMP, JPEG, TIFF loading

Segmentation

OpenCV: (C/C++ code, BSD lic) Pyramid image segmentation
Branch-and-Mincut: (C/C++ code, Microsoft Research Lic) Branch-and-Mincut Algorithm for Image Segmentation
Efficiently solving multi-label MRFs ( Readme): (C/C++ code) Segmentation, object category labelling, stereo

Machine Learning

Torch: (C/C++ code, BSD lic) Gradient machines ( multi-layered perceptrons, radial basis functions, mixtures of experts, convolutional networks and even time-delay neural networks), Support vector machines, Ensemble models (bagging, adaboost), Non-parametric models (K-nearest-neighbors, Parzen regression and Parzen density estimator), distributions (Kmeans, Gaussian mixture models, hidden Markov models, input-output hidden Markov models, and Bayes classifier), speech recognition tools

Object Detection

OpenCV: (C/C++ code, BSD lic) Viola-jones face detection (Haar features)
Torch3Vision: (C/C++ code, BSD lic) MLP & cascade of Haar-like classifiers face detection
Hough Forests: (C/C++ code, Microsoft Research Lic) Class-Specific Hough Forests for Object Detection
Efficient Subwindow Object Detection: (C/C++ code, Apache Lic) Christoph Lampert "Efficient Subwindow" algorithms for Object Detection

Object Category Labelling

Efficiently solving multi-label MRFs ( Readme): (C/C++ code) Segmentation, object category labelling, stereo

Optical flow

OpenCV: (C/C++ code, BSD lic) Horn & Schunck algorithm, Lucas & Kanade algorithm, Lucas-Kanade optical flow in pyramids, block matching
GPU-KLT+FLOW: (C/C++/OpenGL/Cg code, LGPL) Gain-Adaptive KLT Tracking and TV-L1 optical flow on the GPU

Features Extraction & Matching

SIFT by R. Hess: (C/C++ code, GPL lic) SIFT feature extraction & RANSAC matching
OpenSURF: (C/C++ code) SURF feature extraction algorihtm (kind of fast SIFT)
ASIFT (from IPOL): (C/C++ code, Ecole Polytechnique and ENS Cachan for commercial Lic) Affine SIFT (ASIFT)
VLFeat (formely Sift++): (C/C++ code) SIFT, MSER, k-means, hierarchical k-means, agglomerative information bottleneck, and quick shift
SiftGPU: A GPU Implementation of Scale Invariant Feature Transform (SIFT)
Groupsac: (C/C++ code, GPL lic) An enhance version of RANSAC that considers the correlation between data points

Nearest Neighbors matching

FLANN: (C/C++ code, BSD lic) Approximate Nearest Neighbors ( Fast Approximate Nearest Neighbors with Automatic Algorithm Configuration)
ANN: (C/C++ code, LGPL lic) Approximate Nearest Neighbor Searching

Tracking

OpenCV: (C/C++ code, BSD lic) Kalman, Condensation, CAMSHIFT, Mean shift, Snakes
KLT: An Implementation of the Kanade-Lucas-Tomasi Feature Tracker: (C/C++ code, public domain) Kanade-Lucas-Tomasi Feature Tracker
GPU_KLT: (C/C++/OpenGL/Cg code, ) A GPU-based Implementation of the Kanade-Lucas-Tomasi Feature Tracker
GPU-KLT+FLOW: (C/C++/OpenGL/Cg code, LGPL) Gain-Adaptive KLT Tracking and TV-L1 optical flow on the GPU

Simultaneous localization and mapping

Real-Time SLAM - SceneLib: (C/C++ code, LGPL lic) Real-time vision-based SLAM with a single camera
PTAM: (C/C++ code, Isis Innovation Limited lic) Parallel Tracking and Mapping for Small AR Workspaces

Camera Calibration & constraint

OpenCV: (C/C++ code, BSD lic) Chessboard calibration, calibration with rig or pattern
Geometric camera constraint - Minimal Problems in Computer Vision: Minimal problems in computer vision arise when computing geometrical models from image data. They often lead to solving systems of algebraic equations.
Camera Calibration Toolbox for Matlab: (Matlab toolbox) Camera Calibration Toolbox for Matlab by Jean-Yves Bouguet (C implementation in OpenCV)

Multi-View Reconstruction

Bundle Adjustment - SBA: (C/C++ code, GPL lic) A Generic Sparse Bundle Adjustment Package Based on the Levenberg-Marquardt Algorithm
Bundle Adjustment - SSBA: (C/C++ code, LGPL lic) Simple Sparse Bundle Adjustment (SSBA)

Stereo

Efficiently solving multi-label MRFs ( Readme): (C/C++ code) Segmentation, object category labelling, stereo

Structure from motion

Bundler: (C/C++ code, GPL lic) A structure-from-motion system for unordered image collections
Patch-based Multi-view Stereo Software ( Windows version): (C/C++ code, GPL lic) A multi-view stereo software that takes a set of images and camera parameters, then reconstructs 3D structure of an object or a scene visible in the images
libmv - work in progress: (C/C++ code, MIT lic) A structure from motion library

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