Patent Document ID: 9271014
Application ID: 14525583
Patent Flag: 1

Claim One:
1. An image coding method for performing compression-coding on pixel image data, said image coding method comprising: binarizing a signal to be coded of the pixel image data, to generate a binary signal; determining a first low-order context, wherein the first low-order context is associated with a type of the signal to be coded; determining a first high-order context that is common to the first low-order context and at least one second low-order context which is other than the first low-order context, wherein the second low-order context is associated with another type of a signal; calculating coding probability information to be used in arithmetic coding of the binary signal, using first high-order probability information corresponding to the determined first high-order context and first low-order probability information corresponding to the determined first low-order context; performing the arithmetic coding on the binary signal using the calculated coding probability information; and updating the first high-order probability information and the first low-order probability information based on the binary signal.