METHOD FOR CALCULATING POSITION OF REFERENCE SAMPLE OF INTEGER GRID FOR CALCULATING GRADIENT OF BOUNDARY SAMPLE OF BLOCK LEVEL IN CALCULATING OPTICAL FLOW WITH DUAL PREDICTION AND CORRECTION WITH DUAL PREDICTION Russian patent published in 2024 - IPC H04N19/52 

FIELD: physics.

SUBSTANCE: invention relates to image processing and relates to a method for predicting a bidirectional optical flow based on a sample value from a sampling position belonging to an extended region of a predicted block used in predicting a bidirectional optical stream of the current block. Method includes obtaining a motion vector of a current block, obtaining a subpixel sampling position in an extended region of a predicted block in a reference picture based on the obtained motion vector, processing the obtained subpixel sampling position to obtain an integer sampling position of pixels in a reference picture and performing bidirectional optical flow prediction by accessing the reference sample value in the obtained integer pixel sample position in the reference picture.

EFFECT: high degree of image compression with minimal loss of quality.

35 cl, 10 dwg