Patent ID: 9635361
Date: 2017-04-25
CPC Classifications: H04N

Claim:
1. A decoding method for decoding a control parameter for controlling decoding of an image, the decoding method comprising: determining a context for a current block in the image, from among a plurality of contexts; and performing arithmetic decoding on a bitstream corresponding to the current block, using the determined context to obtain the control parameter for the current block, wherein the determining further includes: determining a signal type under which the control parameter for the current block is classified; determining the context by using both of decoded control parameters for a left block and an upper block, when the signal type is a first type, the left block being a neighboring block to the left of the current block, and the upper block being a neighboring block on top of the current block; and determining the context without using any decoded control parameters for the upper block, when the signal type is a second type different from the first type, wherein the control parameter determined as the first type belongs to the current block having a size larger than or equal to a size of a block to which the control parameter determined as the second type belongs, wherein a split flag and a skip flag are classified under the first type, the split flag indicating whether or not the current block is partitioned into a plurality of blocks, and the skip flag indicating whether or not the current block is to be skipped, and wherein inter-prediction information is classified under the second type, the inter-prediction information indicating which of uni-prediction and bi-prediction is used for predicting the current block.