Bigchair-DPCM, a new method for visually irrelevant coding of pictorial information

The author describes a new strategy for irrelevancy reduction of pictorial information which is achieved in conjunction with the well-known DPCM (differential pulse-code modulations) technique. The method imitates the multidimensionally blurred optical projection within the human eyeball by electrical filtering methods applied to the digital picture signal. The blurred signal is processed by the DPCM coder instead of the original one. The result is a reduced transmission rate of the encoded differential signal due to the blurring of the details. After the DPCM decoding the blurred signal is inversely filtered, restoring the picture signal to its original condition, except that on it is superimposed the inversely filtered DPCM quantizing noise. The authors attempt to shape the blurring and deblurring filter responses due to the invisibility of that noise. The procedure was studied by computer simulation