I was asked about available web tutorials to learn Matlab from scratch: here is some links
get to know Matlab
choose several from Matlab tutorials
http://www.mathworks.com/academia/student_center/tutorials/launchpad.html
or if you know a bit about command line interface
http://www.mit.edu/people/abbe/matlab/lec1.html http://www.mit.edu/people/abbe/matlab/lec2.html
should be quicker.
You could also go through a list of Matlab tutorials
http://www.duke.edu/~hpgavin/matlab.html
You could learn from Mathworks site:
http://www.mathworks.com/access/helpdesk/help/toolbox/images/f14-19056.html
Matlab indexing – required knowledge on how matrix are indexed
http://www.mathworks.com/company/newsletters/digest/sept01/matrix.html
Image Processing Quick tutorial
http://www.math.ucla.edu/~getreuer/matlabimaging.html
Image Processing webinars (general)
http://www.mathworks.com/products/image/demos.html
–> list: http://www.agglom.com/set/68248/Image_Processing_with_matlab
Image Processing Weminars (biology)
http://www.mathworks.com/webex/recordings/bioimage_083106/bioimage_083106.html
http://www.mathworks.com/webex/recordings/aalifeml_61407/index.html
http://www.mathworks.com/products/image/demos.html
Not limited to Matlab but is a good list
http://www.imageprocessingplace.com/root_files_V3/tutorials.htm