Method for coding and decoding target block partition information using information about neighboring blocks
The present invention relates to image encoding and image decoding. A method for encoding images according to the present invention comprises the steps of: acquiring division information from peripheral blocks of an encoding target block with respect to the peripheral blocks; predicting the division of the encoding target block on the basis of the acquired division information; encoding information on the difference between the practical division information of the encoding target information and the predictive division information predicted in the predicting process; and transmitting the encoded information. The present invention can encode/decode the division information of the encoding/decoding target blocks using the information about the peripheral blocks.
1. An method for coding image, the method comprising:
obtaining at least one of information about neighboring blocks of a target coding block;
predicting partition information of the target coding block based on the obtained information about the neighboring blocks;
coding partition information about the target coding block based on the predicted partition information, predicted in the prediction step, of the target coding block; and
transmitting the coded partition information about the target coding block,
wherein the obtained information about the neighboring blocks comprises at least one of dissimilarity in intra prediction direction information about the neighboring blocks, dissimilarity in motion information about the neighboring blocks, dissimilarity in filter information about the neighboring blocks, dissimilarity in transform information about the neighboring blocks, size information about the neighboring blocks, gradient information of pixel values about the neighboring blocks, and partition information of the neighboring blocks.
2. The method of claim 1 , further comprising the step of determining whether to perform the partition of the target coding block as predicted in the prediction step, after the step of predicting the partition information of the target coding block,
wherein if, as a result of the determination, the partition of the target coding block is determined to be performed according to the prediction, the target coding block is divided according to the prediction, and information indicating that the target coding block has been divided according to the prediction is coded, and
if, as a result of the determination, the partition of the target coding block is determined not to be performed according to the prediction, information about a difference between the actual partition information and the predicted partition information of the target coding block is coded.
3. The method of claim 2 , wherein if the partition of the target coding block is determined to be performed according to the prediction, the coded partition information about the target coding clock comprises the information indicating that the target coding block had been divided according to the prediction.
4. The method of claim 1 , wherein in the actual partition information and the predicted partition information of the target coding block, a partition boundary of a block is represented by a reference point, a direction based on the reference point, and/or a distance from the reference point.
5. The method of claim 1 , wherein in the actual partition information and the predicted partition information of the target coding block, a partition boundary of a block is represented using a partition pattern having a most similar partition boundary as a partition boundary in the actual partition information or the predicted partition information or both of the target coding block, from specific partition patterns.
6. The method of claim 1 , in the step of coding partition information, wherein, a difference between the actual partition information and the predicted partition information of the target coding block is coding using the actual partition information, the prediction partition information, and the difference between the actual partition information and the predicted partition information.
7. The method of claim 1 , wherein:
in the step of coding partition information, entropy coding is performed for information about the difference, and
the method of coding image further comprising the step of updating an entropy coding model by taking a result of the entropy coding.