<images> | Input file, images to be analyzed |
<basis> | Output file, set of orthogonal basis images |
[n=<n basis>] | Number of basis images to output (<= number of input images) |
[mask=<radius>] | Mask radius in pixels (use the smallest reasonable value), 0 is no mask, -1 is box radius |
[jacobi] | Uses Jacobi method, much slower, but more accurate |
[altwt] | Weights the input images by altitude, helps when used on projections generated with 'prop=' |
svdcmp proj.hed basis.hed
This program is designed to produce a set of orthogonal basis images to use for noise reduction on raw particles. Typically this program will be used on a set of projections covering the asymmetric triangle, but with no in-plane rotation. The resulting basis images can then be applied to an (aligned) noisy image to act as a sort of filter.