SI-FID: Noise-Aware Fine-Tuning for Perceptual Quality Assessment of Stitched Images

Abstract

Accurate evaluation of stitched image quality is essential for advancing stitching algorithms, yet existing objective metrics often diverge from human perception because they insufficiently capture stitching-specific artifacts such as ghosting and misalignment. To address this limitation, we propose SI-FID, a noise-aware extension of the Fréchet Inception Distance tailored for stitched-image assessment. Instead of modifying the FID formulation itself, SI-FID adapts the underlying feature representation through contrastive fine-tuning with controlled perturbations introduced via data augmentation, thereby enhancing sensitivity to subtle stitching-induced distortions. A pre-trained InceptionV3 encoder is calibrated using both original and perturbed samples, yielding a perceptually aligned feature space for distribution-based quality evaluation. Experiments on two complementary benchmark datasets demonstrate that SI-FID improves rank correlation with human subjective scores by over 25\% relative to conventional metrics, providing a more reliable and perceptually consistent indicator for stitched image quality.

6 pages, 8 figures