REGION OF INTEREST BASED SCREEN CONTENTS QUALITY IMPROVING VIDEO ENCODING/DECODING METHOD AND APPARATUS THEREOF

摘要

PURPOSE: A method and a device of coding and decoding screen content video for improving region of interest (ROI) based screen quality are provided to improve subjective quality of the screen content video by determining an ROI considering screen content properties, assigning more bits in a main ROI, and reducing information amount assigned in another regions. CONSTITUTION: An ROI extraction unit (201) extracts ROI information on reference to an inputted original image. An image encoder (202) applies encoding methods according to an interest rate of each region on reference to the extracted ROI information. A rate-distortion adjustment unit (203) adjusts the quality of whole images and a generated bit rate and adjusts subjective quality and the generated bit rate according to the interest rate. The ROI information of a corresponding region is added to an output bit stream (204) when the coding is performed. [Reference numerals] (200) Input image; (201) ROI extraction unit; (202) Image encoder; (203) Rate-distortion adjustment unit; (204) Output bit stream