Image coding method and apparatus and image decoding method and apparatus, based on characteristics of regions of image

摘要

Methods of efficiently coding and decoding an image by analyzing each of regions of the image are provided. In the image coding method, an image format and a coding mode of a first region of an image are determined, whether a current image format of the first region is to be switched is determined based on the determined image format, and the first region is coded based on the determined image format and coding mode.

主权项

1. A method of coding an image, the method comprising:
determining an image format and a coding mode of regions of the image according to color characteristics of the regions; determining whether a current image format of a first region from among the regions of the image is to be switched, based on the determined image format; and coding the first region, based on the determined image format and the determined coding mode, wherein the color characteristics of the first region includes a number of colors of the first region and a gradation of a chroma component of the first region.