Patent ID: 6205254
Filing Date: 2001-03-20
Classification: G06T

Abstract:
An image coding apparatus comprising:an output unit that outputs a value of a first pixel and a value of a second pixel located near the first pixel, the value of the second pixel having been approximated;an approximation unit that calculates approximate values of the first pixel using pixel approximation methods on the basis of the value of the second pixel;a selector that calculates an error between the value of the first pixel and each of the approximate values, and selects one of the approximation methods based on the approximation method producing the minimum error;a ranking unit that assigns a rank to the selected approximation method;wherein the more or less recently selected an approximation method, the higher or lower the rank respectively, or the more or less frequently selected the approximation method, the higher or lower the rank respectively; andan encoder that encodes the rank so as to obtain a code for the first pixel.