How Image Verification Works

Overview

Every image uploaded to MaviCats passes through a three-tier verification pipeline. This system confirms content safety, verifies camera authenticity, and provides trust signals for the community.

Tier 1: Safety Scan

The first tier runs immediately after upload and checks for content safety:

• Uses a neural network classifier (ResNet-50) to analyze image content
• Produces a confidence score for content appropriateness
• Images scoring below the safety threshold are flagged for human review
• Results appear as a green "Verified" or yellow "Under Review" badge

Typical processing time: 100–500ms

Tier 2: Camera Verification

The second tier reads EXIF metadata to identify the camera:

• Extracts Make and Model tags from the JPEG header
• Fuzzy-matches the model name against the MaviCats Gearbase database
• Validates that the image resolution matches the camera's known output specs
• If the user selected a camera when posting, checks for consistency

Possible verdicts:

• Camera Verified (green) — EXIF matches the claimed camera and resolution is correct
• Camera Mismatch (amber) — EXIF data conflicts with the user's camera selection
• Unverified — No EXIF data found or no camera match

Tier 3: Sensor Fingerprint

The third tier performs Sensor Pattern Noise (SPN) analysis:

• Extracts the noise residual from the uploaded image using wavelet denoising
• Compares it against stored reference signatures for the matched camera model
• Computes Normalized Cross-Correlation (NCC) between the image noise and reference signature
• High correlation confirms the image was taken by the identified camera type

Possible verdicts:

• Sensor Verified (cyan) — Strong NCC correlation with reference signature
• Sensor Plausible (blue) — Moderate correlation, consistent with the camera model
• Unmatched — Correlation too low or no reference signature exists
• Insufficient — Reference signature not available for this camera

What you see

After uploading, you'll see badges appear on your images as each tier completes:

1. A scan status badge (Scanning → Verified/Under Review)
2. Camera verification badge (if EXIF data is found)
3. Sensor fingerprint badge (if a reference signature exists)

Post owners can expand the "Image Verification Pipeline" panel on their post's detail page to see full results from all three tiers.

Why this matters

For a community built around vintage cameras, authenticity is core to the experience. The verification pipeline helps:

• Confirm Mavica origin — green badges signal genuine lo-fi photos
• Detect reposts — images from modern cameras tagged as Mavica will show mismatches
• Build trust — verified sellers and collectors can prove their photos are authentic
• Preserve the aesthetic — the community can celebrate real imperfections over digital filters