IMAGE ENCODING METHOD, IMAGE DECODING METHOD, IMAGE ENCODING DEVICE, IMAGE DECODING DEVICE, AND IMAGE ENCODING/DECODING DEVICE.

摘要

　An image encoding method comprising: a binarization step (S401) in which the LAST position information is binarized to generate either (i) a binarized signal which includes a first signal having a length equal to or shorter than a predetermined maximum length and which does not include a second signal, or (ii) a binarized signal which includes a first signal having a predetermined maximum length and a second signal; a first encoding step (S402) in which the context for each binary symbol in the first signal is switched according to the bit position of the binary symbol, and the binary symbols are arithmetically encoded; and a second encoding step (S404) in which if the binarized signal includes a second signal, the second signal is arithmetically encoded using a fixed probability. In the first encoding step, if the first signal has the predetermined maximum length, the binary symbol at the final bit position in the first signal is arithmetically encoded using a context exclusive to the final bit position.