Abstract In this paper, we propose a new real-time algorithm detecting t he flame and smoke in digital CCTV images. Because the forest fire causes the enormous human life and damage of property, the early management according to the early sensing is very importa nt. The proposed algorithm for monitoring forest fire is classified into the flame sensing and detection of smoke. The flame sensing algorithm detects a flame through the conditional test at  color model from the single frame. For the detection of smoke, firstly the background range is set by using differences between current picture and the average picture among the adjacent frames in the weighted value, and the pixels which get out of this range and have a gray-scale are detected in the smoke area. Because the proposed flame sensing algorithm is stronger than the existing algorithms in the change of the ∙제1저자 : 이두희 교선저자 : 김 윤∙투고일 : 2010. 04. 05, 심사일 : 2010. 04. 07, 게재확정일 : 2010. 04. 13.*강원대학교 컴퓨터정보통신공학 석사과정 ** 강원대학교 컴퓨터정보통신공학 부교수※ 이 논문은 2010년 한국컴퓨터정보학회 제41차 동계학술대회에 발표한 “실시간 산불 감지를 위한 화염 및 연기 검출 기법”[1]을 확장한 것임.