IMAGE ENCODING AND DECODING METHOD, APPARATUS, AND SYSTEM

原文（中国語）

An image encoding and decoding method, apparatus, and system are disclosed, and relate to the field of image encoding and decoding technologies. An encoding device adjusts a sub-target bit rate of an unencoded image frame in a video based on a target bit rate of the video, a bit rate of an encoded image frame in the video, and image content included in the unencoded image frame. For example, the encoding device allocates a high sub-target bit rate to an image frame that includes rich image content, so that a bitstream of the image frame reserves more image information. For another example, the encoding device allocates a low sub-target bit rate to an image frame that includes less image information, so that redundant image information is compressed more effectively in the image frame.