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|1. (WO2018066990) IMAGE DATA ENCODING/DECODING METHOD AND APPARATUS|
|Applicants:||KIM, Ki Baek
|Inventors:||KIM, Ki Baek
|Title:||IMAGE DATA ENCODING/DECODING METHOD AND APPARATUS|
Disclosed is an image data encoding/decoding method and apparatus. A method for decoding a 360-degree image comprises the steps of: receiving a bitstream obtained by encoding a 360-degree image; generating a prediction image by making reference to syntax information obtained from the received bitstream; combining the generated prediction image with a residual image obtained by dequantizing and inverse-transforming the bitstream, so as to obtain a decoded image; and reconstructing the decoded image into a 360-degree image according to a projection format. Here, the step of generating the prediction image comprises the steps of: obtaining a motion vector candidate group from motion information included in the syntax information; deriving a prediction motion vector from the motion vector candidate group on the basis of selection information extracted from the motion information; and determining a prediction block for a current block to be decoded, using a final motion vector derived by adding the prediction motion vector to a differential motion vector extracted from the motion information.