@Article{jai.2026.078014,
AUTHOR = {Haoyang Xu},
TITLE = {Frequency-Aware Robustness Analysis of Deepfake Detection Models},
JOURNAL = {Journal on Artificial Intelligence},
VOLUME = {8},
YEAR = {2026},
NUMBER = {1},
PAGES = {153--167},
URL = {http://www.techscience.com/jai/v8n1/66558},
ISSN = {2579-003X},
ABSTRACT = {This paper conducted a comprehensive study on the robustness of three widely used DFD deep learning models—namely, ResNet50, FreqNet, and Xception v1—to controlled perturbation attacks and frequency masking across a range of 12 different distortions. The study was performed on 254,166 ForenSynth test images, characterizing the distribution of FSI-drop values derived from over 3.05 million paired predictions. The distribution of FSI-drop values is sharply peaked around zero: 99.7% of the samples exhibit |Δ| < 0.1, and the maximum |Δ| ≈ 1.5 × 10<sup>−3</sup>, indicating high baseline stability. In terms of perturbation-wise comparison, Gaussian blur dominates, yielding a mean degradation 30 times greater than that induced by JPEG compression and twice that caused by rescaling. The frequency masking curves further illustrate unique sensitivities: FreqNet shows high-frequency dependence and rapid decay (i.e., >2 to >16 masking scale), Xception exhibits moderate attenuation, whereas ResNet50 remains statistically unchanged (median |Δ| < 10<sup>−4</sup>). All of these differences are statistically significant at the model level (<i>p</i> < 0.001). The experiments offer a concrete demonstration that CNNs effectively retain prediction invariance to small amounts of image deformation, but the frequency-sensitive design demonstrates readily interpretable high-frequency sensitivity, thereby providing a principled framework for designing detectors robust to image perturbations. It should be noted that FSI-drop measures score stability rather than absolute performance; §4.6 discusses the complementary AUC curves and leaves combined-distortion or adversarial stress tests to future work.},
DOI = {10.32604/jai.2026.078014}
}