Digital Image Forensic - Examples: By method

Passive blind image forensics

Without any access to an original

Format based approaches

  • Source identification
  • Devicetype identification
  • Device Identifikation
  • RAW-Tool identification
  • JPEG analysis
    • Reconstruction of a compression history
    • Double compression detection (aligned or non-aligned)
    • Quality estimation
    • Thumbnail comparison Sample 1
  • Analysis of metadata

Hardware based approaches

  • Dust
    • Source camera identification
  • Lens
    • CA-based splicing detection
    • Distortion based focal length estimation
  • Sensor
    • CFA-type recognitions or estimation
    • CFA-pattern based splicing recognition Sample 1
    • PRNU based device identification
 

 


Physics based approaches

  • 3D-reconstruction
  • Astronomical inconsistency detection (Sun and moon position or size) Sample 1
  • Geolocation estimation
  • Perspective inconsistency detection
  • Light source estimation
  • Photogrammetry
    • Projective geometry and orthorectification
    • Reverse projection
  • Single view metrology

Soft- and firmware based approaches / Pixel-based approaches

 

 

Statistics based approaches

  • Noise inconsistency detection Sample 1
  • Histogram aberration detection
  • Blind source separation Sample 1

 

 

 

Passive semi-blind image forensics

Without any access to an original, but to other images taken at the same place or the same time

Comparative methods

  • Comparison with images of a series

 

  • Comparison with third party images
 

Passive non-blind image forensics

With access to an original or raw data

Comparative methods

  • Comparison with single image versions or raw-data Sample 1

 

  • Comparison of lage image data sets
 

Active image forensics

 

  • Tasks of Hash-Encryption or Watermarking will be handled by cooperation partners

 

 

 

Signal and image processing

 

Signal reconstruction

  • Blind deconvolution
  • Superresolution
  • Signal reconstruction
  • Image calibration
  • Information extraction