LUT inverse halftoned Images 
PSNR values and Images for LUT inverse halftoned images (See ISCAS2000 Paper)

Method  LUT(Rect) LUT(19pels) fastiht2 (Kite et.al.)
Lena   30.90dB  31.65dB  31.37dB 
Mandrill   25.24dB  26.41dB  22.59dB 
Airplane   29.63dB  29.92dB  29.86dB 

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