1. A method for video object segmentation applied to rainy situations for segmenting a moving object from video images shot in rainy circumstances, comprising: detecting a first frame of video and then determining a plurality of edge pixels and a plurality of non-edge pixels; detecting a second frame of the video just before the first frame, and then determining a plurality of edge pixels and a plurality of non-edge pixels; comparing the plurality of edge pixels of the first frame with the plurality of edge pixels of the second frame, and then determining a plurality of still edge pixels and a plurality of moving edge pixels in order to produce at least one moving edge connection region; according to a result of determining the plurality of still edge pixels and the plurality of moving edge pixels, determining the moving object in the first frame; and updating a composition of a background.