FIELD: video encoding and decoding.
SUBSTANCE: invention relates to encoding and decoding video, and more specifically to signalling the size of an image or parts of an image, which can vary from image to image. Disclosed is a method of decoding an encoded video bitstream, which includes: obtaining a first flag indicating whether a constant image size is used in an encoded video sequence including a current image; based on a first flag indicating that a constant image size is used, decoding the current image without performing resampling of the reference image; based on the first flag indicating that the constant size of the image is not used, obtaining a second flag indicating whether the size of the matching window is signalled; based on the second flag indicating that the matching window size is signalled, obtaining the matching window size, determining the resampling coefficient between the current image and the reference image based on the size of the matching window and performing resampling of the reference image on the current image using the resampling coefficient. First flag is signalled in the sequence parameter set (SPS) and indicates whether the SPS matching window parameters are signalled in the SPS.
EFFECT: high efficiency of encoding and decoding a video bit stream.
17 cl, 10 dwg, 1 tbl
