Original MRI:  

                                              Quantized MRI with:

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


                                             Quantization Error:

                            Entropy = 1.4755 bits/pixel in all three cases.

  SNR = 11.8703 dB                SNR = 14.5108 dB              SNR = 16.9068 dB
   



 * First order error feedback was applied to this image.