1. A method for video object segmenting, comprising: (a) detecting a changing state between a current frame and a previous frame; (b) categorizing regions of the current frame as a moving region, a still region, or a background region and an uncovered background region according to the detecting result from the step (a), to generate a sorting result; (c) determining a moving object in the current frame according to the sorting result from the step (b), to determine a still region and a non still region; and (d) updating a background component, and updating the still region to part of the background component if the still region determined in step (c) keeps static for more than a predetermined time.