Patent ID: 9661326
Date: 2017-05-23
CPC Classifications: H03M,H04N

Claim:
1. A method of entropy-encoding an image, the method comprising: arithmetically encoding a binary value of a current coding symbol, by using a probability of a predefined binary value which is determined based on previously-coded symbols that are encoded before the current coding symbol; and updating the probability of the predefined binary value by using a plurality of scaling factors, according to the binary value of the current coding symbol, wherein, when it is assumed that the plurality of scaling factors are ai (where ai is an real number less than 1, and i is an integer equal to or greater than 1), the probability of the predefined binary value determined based on information about the previously-coded symbols is P_old, a probability of a binary value updated by using the scaling factor ai is Pi_new, and y has a value of 0 or 1 depending on whether the current coding symbol has the predefined binary value, the updating comprises updating the probability of the predefined binary value by using a weighted average value of probabilities Pi_new of a plurality of updated binary values obtained by using Equation; Pi_new=ai*y+(1−ai)*P_old.