Abstract: An on-line procedural method built upon the intelligent user interface-intelligent brush for extracting the object from image is proposed. While the user drives the mouse to trace along object boundary, the brush dynamically estimates the optimized region to be segmented and adjusts stroke properties which provide local information at each instant. Information of appearance, contour, location and contrast are used and combined by formulizing them into a single energy function, then the local result is obtained and the feedback is given in time via graph cut algorithm. After tracing the whole boundary, the object is extracted. The experimental results verify its correctness and effectiveness of the developed approach, and show its better performance in efficiency and accuracy.