METHOD AND APPARATUS FOR ENCODING IMAGE, AND METHOD AND APPARATUS FOR DECODING IMAGE TO MANAGE BUFFER OF DECODER

摘要

PURPOSE: An image coding method for buffer management of a decoder and a device thereof, and an image decoding method and a device thereof are provided to transmit a bitstream after adding size information of a buffer required for decoding each image of an image sequence to the bitstream and to enable a decoder to perform decoding by allocating a buffer required for decoding images based on the size information of a buffer, thereby preventing the decoder from wasting system resources. CONSTITUTION: An image encoding device determines the maximum size of a buffer required for decoding each image frame in a decoder and the number of image frames requiring realignment(2020). The image encoding device determines latency information on an image frame that has the greatest difference between a decoding order and a display order among image frame forming an image sequence(2030). The image encoding device adds a first syntax representing the maximum size of a buffer, a second syntax representing the number of image frames requiring realignment, and a third syntax representing latency information to a set of essential sequence parameters that is a set of information related to the coding of an image sequence(2040). [Reference numerals] (2010) Determine a reference frame of each image frame which constitutes image sequences by performing the prediction and compensation of movement and encode each image frame by using a determined reference frame; (2020) Determine the maximum size of a buffer required for decoding each image frame in a decoder and the number of image frames requiring realignment; (2030) Determine latency information on an image frame that has the greatest difference between a decoding order and a display order among image frame forming an image sequence; (2040) Add a first syntax representing the maximum size of a buffer, a second syntax representing the number of image frames requiring realignment, and a third syntax representing latency information to a set of essential sequence parameters that is a set of information related to the coding of an image sequence; (AA) Start; (BB) End