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The authors establish a reference-based evaluation protocol that leverages pre- and post-event spatial reference markers to cleanly decouple image-center displacement from focal scale changes. Across a 70-trial sequential evaluation of a passive optical support, the framework detected no statistically significant reduction in displacement ($p = 0.597$) or scale spread ($p = 0.356$), while revealing critical, unresolved shifts in marker-estimation eligibility between test runs. This workflow provides a rigorous reporting standard that prevents overconfident claims in optical benchmarking by jointly tracking full-run variability, median absolute deviations, and estimator coverage.
Optical stabilization benchmarks frequently mask systematic estimator dropouts, but decoupling displacement from scale drift across full sequential runs exposes the true baseline noise floor of vision hardware.
We present a reference-based protocol for assessing image stability, illustrated with a passive lens support. Pre/post-event wall references separate image-centre displacement from scale change. All 70 trials were retained: 30 baseline and 40 supported, acquired sequentially. Displacement (p = 0.597) and scale spread (p = 0.356) showed no significant difference. Lower median absolute scale deviation in the supported run persisted with scene-only processing, but its cause remains unresolved. Marker-estimation eligibility differed completely between runs for an unknown reason. The contribution is a workflow that reports completerun variability, typical deviations and estimator coverage together; the case study does not establish support efficacy, equivalence or transient damping.