APPARATUS TO AVOID ROUND ERRORS WHEN TRANSFORMED COEFFICIENTS THAT REPRESENT A MOVING IMAGE SIGNAL ARE INVESTED TRANSFORMED.

摘要

A DISADAPTATION ERROR IS PRODUCED IN THE DECODER OF A MPEG STANDARD COMPRESSOR FOR A MOVING IMAGE SIGNAL AND IN A MPEG STANDARD EXPANDER FOR A COMPRESSED MOVING IMAGE SIGNAL. THIS IS DUE TO THE LACK OF A PATTERN FOR ROUND RESULTS OF .5 (* IT IS A WHOLE) OBTAINED WHEN A SET OF TRANSFORMING COEFFICIENTS RESULTING FROM COMPRESSING THE MOVING IMAGE SIGNAL ARE ORTHALLY TRANSFORMED REVERSE. THE INVENTION PREVENTS DISADAPTATION ERRORS BY PREPROCESSING THE SET OF TRANSFORMATION COEFFICIENTS BEFORE THE REVERSE ORTOGONAL TRANSFORMATION. THE TRANSFORMATION COEFFICIENTS IN THE ASSEMBLY ARE ADDED AND THE PARITY (PAR OR EVEN) OF THE SUM IS CONSIDERED. WHEN IT IS CONSIDERED THAT THE PARITY OF THE SUM IS PAR, THE PARITY OF ONE OF THE TRANSFORMATION COEFFICIENTS IN THE ASSEMBLY IS INVESTED TO PROVIDE AN INVESTED PARITY TRANSFORMATION COEFFICIENT. THIS MAKES THE PARITY OF SUM SUM TO BE UNPAIRED. THEN, WHEN CONCLUSION OF TRANSFORMATION COEFFICIENTS THAT INCLUDE THE INVESTED PARTITION TRANSFORMATION COEFFICIENT, THEY ARE TRANSFORMED INTO INVESTED FORM, NONE OF THE RESULTS OF THE ORTOGONAL TRANSFORMATION WILL HAVE A VALUE OF * .5.