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OpenPR, stands for Open Pattern Recognition project and is intended to be an open source platform for sharing algorithms of image processing,
computer vision, natural language processing, pattern recognition, machine learning and the related fields. Code released by OpenPR is under BSD license, and can be freely used for education and academic research. OpenPR is currently supported by the National
Laboratory of Pattern Recognition, Institution of Automation, Chinese Academy of Sciences.
Thresholding
program 
This is demo program on global thresholding for image of bright small objects, such as aircrafts in airports. the program include four method, otsu,2D-Tsallis,PSSIM, Smoothnees Method.
Authorschen
xueyun
E-mail xueyun.chen@nlpr.ia.ac.cn
Principal
Component Analysis Based on Nonparametric Max...
In this paper, we propose an improved principal component analysis based on maximum entropy (MaxEnt) preservation, called MaxEnt-PCA, which is derived from a Parzen window estimation of Renyi’s quadratic entropy. Instead of minimizing the reconstruction ...
AuthorsRan
He
E-mail rhe@nlpr.ia.ac.cn
Metropolis–Hastings
algorithm 
Metropolis-Hastings alogrithm is a Markov chain Monte Carlo method for obtaining a sequence of random samples from a probability distribution for which direct sampling is difficult. Thi sequence can be used to approximate the distribution.
AuthorsGong
Xing
E-mail xgong@nlpr.ia.ac.cn
Tagssampling, distribution
Maximum
Correntropy Criterion for Robust Face Recogniti...
This code is developed based on Uriel Roque's active set algorithm for the linear least squares problem with nonnegative variables in: Portugal, L.; Judice, J.; and Vicente, L. 1994. A comparison of block pivoting and interior-point algorithms for linear ...
AuthorsRan
HE
E-mail rhe@nlpr.ia.ac.cn
Tagspattern
recognition
Naive
Bayes EM Algorithm
OpenPR-NBEM is an C++ implementation of Naive Bayes Classifier, which is a well-known generative classification algorithm for the application such as text classification. The Naive Bayes algorithm requires the probabilistic distribution to be discrete. Op ...
AuthorsRui
XIA
E-mail rxia@nlpr.ia.ac.cn
Tagspattern
recognition, natural
language processing, text
classification
Local
Binary Pattern
This is a class to calculate histogram of LBP (local binary patterns) from an input image, histograms of LBP-TOP (local binary patterns on three orthogonal planes) from an image sequence, histogram of the rotation invariant VLBP (volume local binary patte ...
AuthorsJia
WU
E-mail jwu@nlpr.ia.ac.cn
Tagscomputer
vision, image
processing, pattern
recognition
Two-stage
Sparse Representation
This program implements a novel robust sparse representation method, called the two-stage sparse representation (TSR), for robust recognition on a large-scale database. Based on the divide and conquer strategy, TSR divides the procedure of robust recogni ...
AuthorsRan
HE
E-mail rhe@dlut.edu.cn
Tagspattern
recognition
CMatrix
Class
It's a C++ program for symmetric matrix diagonalization, inversion and principal component anlaysis(PCA). The matrix diagonalization function can also be applied to the computation of singular value decomposition (SVD), Fisher linear discriminant analysis ...
AuthorsChenglin
LIU
E-mail liucl@nlpr.ia.ac.cn
Tagspattern
recognition
P3P(Perspective
3-Points) Solver
This is a implementation of the classic P3P(Perspective 3-Points) algorithm problem solution in the Ransac paper "M. A. Fischler, R. C. Bolles. Random Sample Consensus: A Paradigm for Model Fitting with Applications to Image Analysis and Automated Cartogr ...
AuthorsZhaopeng
GU
E-mail zpgu@nlpr.ia.ac.cn
TagsComputer
Vision, PNP, Extrinsic
Calibration
Linear
Discriminant Function Classifier
This program is a C++ implementation of Linear Discriminant Function Classifier. Discriminant functions such as perceptron criterion, cross entropy (CE) criterion, and least mean square (LMS) criterion (all for multi-class classification problems) are sup ...
AuthorsRui
Xia
E-mail rxia@nlpr.ia.ac.cn
Tagslinear
classifier, discriminant
function
Naive
Bayes Classifier
This program is a C++ implementation of Naive Bayes Classifier, which is a well-known generative classification algorithm for the application such as text classification. The Naive Bayes algorithm requires the probabilistic distribution to be discrete. Th ...
AuthorsRui
Xia
E-mail rxia@nlpr.ia.ac.cn
Tagspattern
recognition, natural
language processing, text
classification
OpenCV
Based Extended Kalman Filter Frame
A simple and clear OpenCV based extended Kalman filter(EKF) abstract class implementation,absolutely following standard EKF equations. Special thanks to the open source project of KFilter1.3. It is easy to inherit it to implement a variable state and me ...
AuthorsZhaopeng
GU
E-mail zpgu@nlpr.ia.ac.cn
TagsComputer
Vision, EKF, INS
Supervised
Latent Semantic Indexing
Supervised Latent Semantic Indexing(SLSI) is an supervised feature transformation method. The algorithms in this package are based on the iterative algorithm of Latent Semantic Indexing.
AuthorsMingbo
Wang
E-mail mb.wang@nlpr.ia.ac.cn
SIFT
Extractor
This program is used to extract SIFT points from an image.
AuthorsZhenhui
Xu
E-mail zhxu@nlpr.ia.ac.cn
Tagscomputer
vision
OpenPR-0.0.2 ![]()