Work at the Weizmann

The following are some results of my work at the Weizmann Institute of Science during summer 2002.

significant deliverables

Pattern Matching by Cross-Correlation — how to find a pattern in a micrograph
Particle Picking by Cross-Correlation — how to automatically identify filaments in a micrograph
Graphical tool for selecting filaments in micrographs — a handy tool if you want to use single-particle methods to approach helical structures

C code to read SPIDER image files, including a Matlab interface
Multi-threaded FFT for Matlab, a simple modification of the basic FFTW-Matlab interface that allows it to utilize multiple processors if available

Rotation by Shearing — exposition of a paper by Alan Paeth, which describes a commonly-used technique for rotating images. (A rotation can be accomplished via three sheering operations. Unfortunately, while easy to implement and fast to run, the results are very poor compared to a direct rotation operation with bilinear interpolation.)
Radon Transform — the mathematical transformation that is inverted when performing tomography
Open Problems — problems I hadn't yet solved, and ideas for future work.