A Novel No-Reference Image Quality Metric For Assessing Sharpness In Satellite Imagery
This is an incremental improvement for satellite imagery quality assessment, providing a reliable tool for monitoring satellite fleets.
The paper tackles the problem of assessing image sharpness in satellite imagery without reference images by introducing a novel no-reference metric based on gradient decay rates, which demonstrates superior consistency with human perception and computational efficiency compared to deep learning methods.
This study introduces a novel no-reference image quality metric aimed at assessing image sharpness. Designed to be robust against variations in noise, exposure, contrast, and image content, it measures the normalized decay rate of gradients along pronounced edges, offering an objective method for sharpness evaluation without reference images. Primarily developed for satellite imagery to align with human visual perception of sharpness, this metric supports monitoring and quality characterization of satellite fleets. It demonstrates significant utility and superior performance in consistency with human perception across various image types and operational conditions. Unlike conventional metrics, this heuristic approach provides a way to score images from lower to higher sharpness, making it a reliable and versatile tool for enhancing quality assessment processes without the need for pristine or ground truth comparison. Additionally, this metric is computationally efficient compared to deep learning analysis, ensuring faster and more resource-effective sharpness evaluations.