我把我底下贴的AI修改的旧照片再从文学城下载下来，run Forensic Analysis，这是分析报告：

Here’s a concise forensic-style summary of the analysis:

 

 

 

 

? Forensic Analysis Summary

 

 

Image Source: Social media download (metadata stripped)

Objective: Determine if AI-generated or real photo

 

 

 

 

Analyses Performed

 

 

1. Sensor Noise Analysis
   • Mean ≈ 0 (no bias)
   • Std dev ≈ 13.9 (normal sensor noise)
   • Noise strongest in shadows/edges → consistent with real cameras.
2.  
3. Frequency Spectrum
   • Smooth natural falloff in high frequencies.
   • No grid-like or spiked artifacts (common in AI).
4.  
5. Local Texture Variance
   • Wide spread of patch variances (mean ≈ 1184, std ≈ 1574).
   • Mix of smooth (skin, wall) and detailed (clothing, bricks) areas.
   • Distribution looks natural, unlike AI’s uniform/chaotic patterns.
6.  
7. Fine-Detail Edge Map (Laplacian)
   • Strong, clean edges at boundaries.
   • Consistent textures with no warped or “melting” artifacts.
   • High kurtosis (~26), indicating realistic edge vs. smooth area balance.
8.  

 

 

 

 

 

Conclusion

 

 

All forensic tests (noise, frequency, texture, edges) indicate the image is highly likely a real camera photograph.

No clear evidence of AI generation was found.