Original SMANDRIL:  

                                        Quantized SMANDRIL with:

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


                                               Quantization Error:

                               Entropy = 1.8817 bits/pixel in all three cases.

   SNR = 9.7472 dB                SNR = 10.7893 dB              SNR = 13.2188 dB
   



 * First order error feedback was applied to this image.