IMAGE ENCODING DEVICE AND METHOD THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a device capable of reducing a generation code amount by providing a state value generation means, the number of times of state generation, a prediction correction value generation means, a correction prediction value generation means, a prediction error generation means and an entropy encoding means. SOLUTION: In a counter circuit 108, the numger N(S) of times of generation and a cumulative error E(S) are taken out corresponding to a state number outputted from a context generation circuit 103 and they are delivered to a prediction correction value generation circuit 105 and a counter updating circuit 109. In the prediction correction value generation circuit 105, a prediction correction value C is obtained by the arithmetic operation of E(S)/N (S). Also, a subtraction circuit 107 obtains a prediction error (e). A selector 112 compares the three values of the prediction error (e) and fixed values Th and-<=h, ranks them by the sizes, selects the second largest value and outputs it to a signal line 113. The counter updating circuit 109 adds an input value from the signal line 113 to the E (S).