ENCODING AND DECODING METHOD, ENCODER, DECODER, AND STORAGE MEDIUM

Embodiments of the present application provide an encoding and decoding method, an encoder, a decoder, and a storage medium. At an encoding end, a plurality of shift factors corresponding to a plurality of mesh vertexes in a current image block are determined; according to a non-zero shift factor in the plurality of shift factors, location index information of the non-zero shift factor in the plurality of shift factors is determined; shift factor identification information is determined according to the location index information of the non-zero shift factor; the shift factor identification information and the location index information are encoded, the non-zero shift factor in the plurality of shift factors is encoded according to the location index information, and an obtained encoded bit is written in a code stream. During encoding, the shift factors do not need to be mapped from a three-dimensional space to a two-dimensional image, and transformed and quantized shift factors are directly encoded; and duri