Method for generating depth map and device thereof

The invention relates to a method for generating a depth map and a device thereof. The method comprises the following steps: according to a dense matching method, obtaining a first depth map representing the pixel depth of a second frame by using a first frame and a second frame of monocular video streaming; detecting the characteristic points of the second frame and a third frame of the monocular video streaming, matching the characteristic point of the third frame with the characteristic point with the second frame to obtain a characteristic vector, and dividing the first depth map into a plurality of areas according to the pixel depth of the second frame; estimating the motion of the detected characteristic point to obtain motion parameters, and updating the parameters of the areas according to the motion parameters and the characteristic vector, thereby updating the areas to be used as a part of the second depth map representing the pixel depth of the third frame; and detecting a new area in the third frame, and calculating the pixel depth of the new area in the third frame to serve as another part of the second depth map, thereby obtaining a second depth map.