Refactor Star Roundness Aggregation to Prevent Artifact Contamination #280

Description

The current implementation uses np.max() on a concatenated array of all detected star roundness values. This causes the final star_roundness metric to capture the single worst outlier or artifact (like a hot pixel or saturated star) in the entire frame, pinning the metric to an artificially high value regardless of actual tracking quality.

Required Changes

• Modify the roundness calculation block inside calculate_metrics_from_data.
• Instead of concatenating roundness1 and roundness2 globally, evaluate them side-by-side using np.maximum(abs_r1, abs_r2) to find the dominant asymmetry axis per individual star.
• Compute the np.median() (or np.mean()) of these per-star maximums to represent the overall tracking health of the subframe without being corrupted by isolated pixel defects.