The Coursera class Computational Methods of Data Analysis started yesterday. There is still plenty of time to enroll in the class.
This course assumes a good familiarity with calculus, linear algebra, and some basic programming. Thus, if your math background is weak or needs a refresher, you may not want to take this course. However, if you have a solid math background, the course starts right into Fourier Analysis. The course topics look good, and image analysis is one of the central themes of the course. The software Matlab ($99 for student edition) is recommended, however Octave (Free) is acceptable.