Quantization method and circuit therefor

Details Quantization method and circuit therefor Quantization method and circuit therefor

1995-03-30

1997-12-16

Au, Amelia

Television

Bandwidth reduction system

Data rate reduction

348420, H04N 732

Patent

active

056991193

ABSTRACT:
In a method for quantizing a moving picture signal and a circuit therefor, the method includes the steps of calculating horizontal and vertical gradients of first pixel values in a macroblock, determining each maximum value of the horizontal and vertical gradients, classifying the moving picture signal into complexity class if the maximum value is greater than a first threshold value and into edge class if the maximum value is greater than a second threshold value and is less than a third threshold value, calculating an activity value with respect to the first pixel values in the macroblock by calculating the sum of absolute values of DCT coefficients for four blocks in the macroblock, calculating an activity normalization coefficient, using the activity value of the macroblock and an average activity value of all pixels of the same picture type; and calculating a reference quantization step size produced by a backward rate control through a forward estimation considering coding efficiency and a visual characteristic which depends on the class of the moving picture signal and the energy of DCT coefficients. Therefore, a high efficiency and high picture quality moving picture compressor can be implemented.

REFERENCES:
patent: 5307163 (1994-04-01), Hatano et al.
patent: 5543848 (1996-08-01), Murakami et al.

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