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Technical report uncovers an outdated stabilization constant in an archived demonstration video, clarifying standard mathematical parameters for image similarity assessment.
Notice Technical Report v1.4's evidence package includes **Video B** ("System Display, Unedited"), a screen recording of a personal, self-built educational tool used to study SSIM's behavior directly (a local interactive web dashboard). That recording shows the tool using the SSIM stabilization constant C1 = 0.01 — the value later found to be incorrect and corrected in Technical Report v1.10 (C1 was missing the squaring required by the standard Wang et al. (2004) convention Ci=(KiL)²; the correct value is C1 = 0.0001). This tool is no longer in use, and no value or finding published in any Meritcs technical report depends on its computations — it was a self-study aid only. This notice exists so that no reader of Technical Report v1.4 mistakes what Video B shows for a still-current value. No correction to Technical Report v1.4's own text is required: the report's written content does not state a numerical value for μc anywhere. Only the archived video shows the outdated constant on screen. Dataset and Mandatory Citation:- Source: NIH ChestX-ray8 (Hospital-scale chest x-ray database)- Citation: Wang, X., Peng, Y., Lu, L., Lu, Z., Bagheri, M., & Summers, R. M. (2017). "ChestX-ray8: Hospital-scale chest x-ray database and benchmarks on weakly-supervised classification and localization of common thoracic diseases." Proceedings of the IEEE Conference on Computer Vision and Pattern Recognition (CVPR), 3462–3471. - Download: https://nihcc.app.box.com/v/ChestXray-NIHCC Contact : s.shiny.n.works@gmail.com
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neco mohumohu (2026) studied this question.
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