VIDEO ENCODING METHOD AND APPARATUS AND VIDEO DECODING METHOD AND APPARATUS

摘要

An image encoding method includes generating symbols by performing transformation and quantization according to a transformation block, on a block that performs prediction according to a prediction mode; updating a probability index of a current sub block by using a probability index of a previous sub block among sub blocks included in the transformation block; determining a rate according to a bit length of the current sub block by using the probably index; determining a rate of the transformation block by using rates of the sub blocks; determining a distortion by using a difference between an original image and a reconstruction image according to transformation and quantization; and determining a rate-distortion (R-D) cost by using the distortion and the rate.

主权项

1. A method of encoding an input image, comprising:
by at least one processor, which executes instructions stored in at least one memory,
generating symbols by performing transformation and quantization based on a transformation block on which prediction is performed according to a prediction mode, the transformation block including at least a data unit of the input image;updating a probability index of a current sub block by using a probability index of a previous sub block among sub blocks included in the transformation block;determining a rate according to a bit length of the current sub block by using the probably index;determining a rate of the transformation block by using rates of the sub blocks;determining a distortion by using a difference between the input image and a reconstruction image reconstructed according to the transformation and the quantization; anddetermining a rate-distortion (R-D) cost by using the distortion and the rate.