Quantization adaptive to the human visual system

Claim 1

An adaptive quantizing method for calculating an adaptive quantization spacing in HDTV comprising: a first step of dividing data defining an HDTV picture into macroblocks and microblocks; a second step of determining for each macroblock and microblock the presence of a boundary passing therethrough; a third step of setting a sector value to a predetermined value if a macroblock contains a boundary or, if no boundary passes through said macroblock, setting said sector value to a value equal to a mean variance of the macroblock plus a brightness value based upon the mean pixel value for said macroblock to generate a final sector value; a fourth step of calculating a human visual system parameter QSP2 from a first sector function value f1 if a scene change occur, a fifth step of setting said human visual system parameter QSP2 equal to a first sector function value if motion is not detected and a scene change has not occurred, or setting said human visual system parameter QSP2 equal to a second section function value f2 if motion is detected and a scene change has not occurred.