Original REAGAN:  

                                          Quantized REAGAN with:

error feedback high pass sense*. error feedback low pass sense*. no error feedback.
   
 


                                              Quantization Error:

                             Entropy = 1.8701 bits/pixel in all three cases.

  SNR = 12.2655 dB                SNR = 14.1062 dB             SNR = 16.4887 dB
   



 * First order error feedback was applied to this image.