Method for processing image providing improved arithmetic encoding, method for decoding and encoding image using same, and apparatus for same

An image encoding method performed by an image encoding apparatus, the method comprising:

• processing arithmetic encoding on quantized image information to generate a bitstream,
• wherein the processing of the arithmetic encoding comprises:
• selecting an arithmetic encoding process corresponding to a symbol segment based on a number of symbols included in a symbol segment information;
• and
• encoding at least one symbol included in the symbol segment in response to the selected the arithmetic encoding process, and
• wherein when the number of symbols included in symbol segment information is greater than a predetermined number, the arithmetic decoding process corresponding to the symbol segment is selected as bypass decoding.

A non-transitory computer-readable recording medium storing a bitstream that is generated by an image encoding method, the method comprising:

• processing arithmetic encoding on quantized image information to generate a bitstream,
• wherein the processing of the arithmetic encoding comprises:
• selecting an arithmetic encoding process corresponding to a symbol segment based on a number of symbols included in a symbol segment information;
• and
• encoding at least one symbol included in the symbol segment in response to the selected the arithmetic encoding process, and
• wherein when the number of symbols included in symbol segment information is greater than a predetermined number, the arithmetic decoding process corresponding to the symbol segment is selected as bypass decoding.