Coding and decoding methods of reference image, coding device, and decoding device

The invention provides a coding method of a reference image. The method comprises: a to-be-coded sequence is coded and a reconstruction image of a first reference image and a reconstruction image of a second reference image are obtained; whether a local area in the second reference image is suitable for updating a corresponding area or a related area in the first reference image is determined; whether the corresponding area or the related area in the first reference image is updated is determined; if the corresponding area or the related area in the first reference image is not updated and the local area in the second reference image is suitable for updating the corresponding area or the related area in the first reference image, a pixel value of the local area in the second reference image is used for replacing a pixel value of corresponding area or the related area in the first reference image; and reference image updating information for determining whether local area in the second reference image is used for updating corresponding area or the related area in the first reference image is coded into a code stream.