Patent ID: 8270747
Filing Date: 2012-09-18
Classification: H04N

Abstract:
1. An image encoding device that receives a plurality of component values of a color input signal inputted to an object pixel, vector quantizes, and encodes each of the plurality of component values, comprising: a difference vector quantization unit that vector quantizes and encodes each difference value obtained by subtracting prediction component values based on a previous object pixel from the component values of the object pixel respectively; an absolute value vector quantization unit that vector quantizes and encodes each different value of the object pixel; a determination unit that compares each difference value with respective comparison ranges to determine a code selection; and a code selector that selects one of an output from the difference vector quantization unit and an output from the absolute value vector quantization unit based on an output from the determination unit wherein a plurality of difference vector quantization representative values assigned to a difference vector quantization space is not arranged to eight corners of a rectangular parallelepiped space that is surrounded by an upper threshold and a lower threshold of each of the comparison ranges in the difference vector quantization space, and the code selector selects an output of the absolute value vector quantization unit based on an output from the determination unit if a difference vector quantization representative value corresponding to each difference value does not exist.