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Table 5 Confusion matrices of various JPEG compression.

From: Screenshot identification by analysis of directional inequality of interlaced video

   out     out     out  
  NS SS UN   NS SS UN   NS SS UN
in     in     in    
NS 97.80 0.50 1.70 NS 97.53 0.70 1.77 NS 97.33 0.77 1.90
CS 0.07 98.43 1.50 CS 0.07 98.53 1.40 CS 0.27 97.50 2.23
  JPEG quality: 100    JPEG quality: 90    JPEG quality: 80  
   out     out     out  
  NS SS UN   NS SS UN   NS SS UN
in     in     in    
NS 97.73 0.60 1.67 NS 97.90 0.87 1.23 NS 98.13 0.97 0.90
CS 0.03 98.77 1.20 CS 0.13 98.93 0.93 CS 0.17 98.83 1.00
  JPEG quality: 70    JPEG quality: 60    JPEG quality: 50  
   out     out     out  
  NS SS UN   NS SS UN   NS SS UN
in     in     in    
NS 98.90 0.77 0.33 NS 99.17 0.50 0.33 NS 99.37 0.10 0.53
CS 1.30 95.43 3.10 CS 1.17 95.73 3.10 CS 2.43 93.93 3.63
  JPEG quality: 40    JPEG quality: 30    JPEG quality: 20  
  1. (UN: Undetermined, unit: %, Dark gray cell: identification accuracy is larger than 95%, Light gray cell: identification accuracy is smaller than or equal to 95%)