HAS-Motion Software Documentation

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Image Optimization ======

Accurate tracking of bones is sensitive to the X-ray and [[other:dsx:dsx_definitions#digitally_reconstructed_radiograph_drr|digitally reconstructed readiograph]] (DRR) image processing parameters. In some cases it can take a significant amount of trial and error to determine the parameter values that enable the image matching algorithm to "lock in" on the correct bone pose. That is, the parameter values that cause the global minimum of the image fitness function to be at the correct bone pose. There are 15 different parameters, and sometimes changes of 1 or 2% in one of them can change the "optimal" bone pose by a few degrees or millimeters.

===== Image Optimization Widget =====

The //Image Optimization// widget is a tool for automatically finding optimal values of the parameters.

{{:X4DImageOptimizationWidget.png}}

The sliders allow you to specify ranges for each of the 15 parameters in the [[other:dsx:x4d:x-ray_and_drr_settings|X-Ray and DRR Settings widget]]. The //Max Iterations// slider at the top is for specifying how many tracking optimizations to perform with randomly chosen parameter values within the specified ranges.

Each tracking optimization proceeds as if you had selected //Solve Current Frame// in the //Object Tracking// widget. It optimizes the selected bones, starting at their current poses, and compares the final poses to the initial ones. The smaller this difference, the better the result.

===== Tutorial =====

See [[other:dsx:x4d:tutorials:how_to_optimize_x-ray_and_drr_settings|How To: Optimize X-Ray/DRR Settings]] for a step-by-step guide on using this widget.