Quality Assessment of Despeckling Filters Based on the Analysis of Ratio Images

We present a quantitative and qualitative evaluation of despeckling filters based on a set of Haralick-derived features and the Jensen–Shannon Divergence obtained from ratio images. To that aim, we propose a normalized composite index, called the Texture-Divergence Measurement (TDM), that describes the statistical and structural behavior of the filtered images. Complementary qualitative analysis using Image Horizontal Visibility Graphs (IHVGs) confirms the results of the proposed metric. The combination of the proposed TDM metric and IHVG visualization provides a robust framework for assessing despeckling performance from both statistical and structural perspectives.