Over the time of my research I have found out that it is really difficult to get access to actual codes that different authors use in their implementation for their publication.
I just found out about a very good link where you can find basic algorithms and implementations of different image processing techniques which can be useful for a person doing research in these field.
Here is the link ( Peter's Functions for Computer Vision ):
http://www.csse.uwa.edu.au/~pk/research/matlabfns/
Kudos to the University of Australia for putting this online for other researchers.
Update 07/03/2013: Since I wrote this post, I have found numerous matlab implementation pages online. I am sharing a list below.
Right now I have just listed down all the available toolboxes and codes. I will be sorting and updating this list soon.
Damien's Matlab library @ University of Liège:
http://www.montefiore.ulg.ac.be/~dteney/dml.htm
VisionLab @ Johns Hopkins University
http://www.vision.jhu.edu/code/
Vision Research Lab @ UCSB
http://vision.ece.ucsb.edu/~zuliani/Code/Code.html
Computer Vision Source Codes @ CMU
http://www.cs.cmu.edu/~cil/v-source.html
Balu Toolbox for Matlab @ ING
http://dmery.ing.puc.cl/index.php/balu/
Matlab Computer Vision and Pattern Recognition Toolbox @ Naotoshi Seo
http://note.sonots.com/Matlab/cvprtoolbox.html
Camera Calibration Toolbox @ Caltech
http://www.vision.caltech.edu/bouguetj/calib_doc/
Multiple View Geometry @ Multiple View Geometry in Computer Vision (CODE)
http://www.robots.ox.ac.uk/~vgg/hzbook/code/
Tutorial on Stereo Vision @ cvmatlab blog
http://cvmatlab.blogspot.co.uk/2012/10/stereo-vision.html
Optical Flow, PCA and Human Motion Tracking @ Michael J. Black (Brown University)
http://cs.brown.edu/~black/code.html
Stereo and Optical Flow Code @ UMD
http://www.cs.umd.edu/~ogale/download/code.html
Kernel based object recognition @ The University Of Queensland ( Mehrtash Harandi )
http://itee.uq.edu.au/~uqmhara1/code.html
Piotr's Image & Video Matlab Toolbox @ UCSD
http://vision.ucsd.edu/~pdollar/toolbox/doc/index.html
Computer Vision Source Codes for Selected topics @ Clickdamage
http://clickdamage.com/sourcecode/index.php
Different Computer Vision Projects with Code (Including Camshift) @ My Gerg Life blog
http://www.gergltd.com/cse486/
Machine Vision Toolbox @ Peter Corke (Author of Robots, Vision and Control)
http://www.petercorke.com/Machine_Vision_Toolbox.html
Computer Vision Tools and Tutorials @ Sunglok Choi
Color Based Image Segmentation @ Computer Vision Research Group UWO
http://vision.csd.uwo.ca/code/
Matlab toolbox for multiscale Image processing @ NYU
http://www.cns.nyu.edu/lcv/software.php
Other related lists:
A total comprehensive list of matlab functions, (related to graphics and other topics) can be found at John Burkardt's webpage: http://people.sc.fsu.edu/~jburkardt/m_src/m_src.html
A comprehensive list of different computer vision related datasets and links can be found here:
https://sites.google.com/site/younghoonleehome/Tools-and-Links/computer-vision
Comprehensive List of Available CV Code @ Visionbib:
http://vendors.visionbib.com/codelist.html
I just found out about a very good link where you can find basic algorithms and implementations of different image processing techniques which can be useful for a person doing research in these field.
Here is the link ( Peter's Functions for Computer Vision ):
http://www.csse.uwa.edu.au/~pk/research/matlabfns/
Kudos to the University of Australia for putting this online for other researchers.
Update 07/03/2013: Since I wrote this post, I have found numerous matlab implementation pages online. I am sharing a list below.
Right now I have just listed down all the available toolboxes and codes. I will be sorting and updating this list soon.
Damien's Matlab library @ University of Liège:
http://www.montefiore.ulg.ac.be/~dteney/dml.htm
VisionLab @ Johns Hopkins University
http://www.vision.jhu.edu/code/
Vision Research Lab @ UCSB
http://vision.ece.ucsb.edu/~zuliani/Code/Code.html
Computer Vision Source Codes @ CMU
http://www.cs.cmu.edu/~cil/v-source.html
Balu Toolbox for Matlab @ ING
http://dmery.ing.puc.cl/index.php/balu/
Matlab Computer Vision and Pattern Recognition Toolbox @ Naotoshi Seo
http://note.sonots.com/Matlab/cvprtoolbox.html
Camera Calibration Toolbox @ Caltech
http://www.vision.caltech.edu/bouguetj/calib_doc/
Multiple View Geometry @ Multiple View Geometry in Computer Vision (CODE)
http://www.robots.ox.ac.uk/~vgg/hzbook/code/
Tutorial on Stereo Vision @ cvmatlab blog
http://cvmatlab.blogspot.co.uk/2012/10/stereo-vision.html
Optical Flow, PCA and Human Motion Tracking @ Michael J. Black (Brown University)
http://cs.brown.edu/~black/code.html
Stereo and Optical Flow Code @ UMD
http://www.cs.umd.edu/~ogale/download/code.html
Kernel based object recognition @ The University Of Queensland ( Mehrtash Harandi )
http://itee.uq.edu.au/~uqmhara1/code.html
Piotr's Image & Video Matlab Toolbox @ UCSD
http://vision.ucsd.edu/~pdollar/toolbox/doc/index.html
Computer Vision Source Codes for Selected topics @ Clickdamage
http://clickdamage.com/sourcecode/index.php
Different Computer Vision Projects with Code (Including Camshift) @ My Gerg Life blog
http://www.gergltd.com/cse486/
Machine Vision Toolbox @ Peter Corke (Author of Robots, Vision and Control)
http://www.petercorke.com/Machine_Vision_Toolbox.html
Computer Vision Tools and Tutorials @ Sunglok Choi
http://vision.csd.uwo.ca/code/
Matlab toolbox for multiscale Image processing @ NYU
http://www.cns.nyu.edu/lcv/software.php
Other related lists:
A total comprehensive list of matlab functions, (related to graphics and other topics) can be found at John Burkardt's webpage: http://people.sc.fsu.edu/~jburkardt/m_src/m_src.html
A comprehensive list of different computer vision related datasets and links can be found here:
https://sites.google.com/site/younghoonleehome/Tools-and-Links/computer-vision
Comprehensive List of Available CV Code @ Visionbib:
http://vendors.visionbib.com/codelist.html
Computer Vision Coursework
Computer Vision Coursework @ UMIACS
http://www.umiacs.umd.edu/~ramani/cmsc828.html
Computer Vision Coursework @ UTA
http://vlm1.uta.edu/~athitsos/courses/cse6367_spring2012/
Computer Vision Coursework @ WUSTL
http://www.cs.wustl.edu/~pless/559/
Computer Vision Coursework @ Illinois
http://www.cs.illinois.edu/~slazebni/spring11/
Computer Vision Coursework @ TONGJI University
http://sse.tongji.edu.cn/linzhang/ComputerVision/CV.htm
Computer Vision Coursework @ Johns Hopkins University
http://www.ugrad.cs.jhu.edu/~cs461/
Computer Vision Coursework @ University of Sussex
http://www.cogs.sussex.ac.uk/courses/compvis/links.html
Computer Vision Coursework @ UCSD
http://cseweb.ucsd.edu/classes/fa11/cse252A-a/
Computer Vision Coursework @ ITTC
http://www.ittc.ku.edu/~potetz/EECS_741.html
http://www.umiacs.umd.edu/~ramani/cmsc828.html
Computer Vision Coursework @ UTA
http://vlm1.uta.edu/~athitsos/courses/cse6367_spring2012/
Computer Vision Coursework @ WUSTL
http://www.cs.wustl.edu/~pless/559/
Computer Vision Coursework @ Illinois
http://www.cs.illinois.edu/~slazebni/spring11/
Computer Vision Coursework @ TONGJI University
http://sse.tongji.edu.cn/linzhang/ComputerVision/CV.htm
Computer Vision Coursework @ Johns Hopkins University
http://www.ugrad.cs.jhu.edu/~cs461/
Computer Vision Coursework @ University of Sussex
http://www.cogs.sussex.ac.uk/courses/compvis/links.html
Computer Vision Coursework @ UCSD
http://cseweb.ucsd.edu/classes/fa11/cse252A-a/
Computer Vision Coursework @ ITTC
http://www.ittc.ku.edu/~potetz/EECS_741.html
The above list is just to facilitate anyone doing research in this field. If you do use the codes or lecture notes for publication or any other purposes please ask permission of the respective authors first, and cite the respective publication.