1. An image processing method comprising: acquiring depth information of an image; dividing the image into a plurality of regions based on the acquired depth information; setting a portion of the divided regions to a first region of interest; setting a plurality of reference depth values with respect to an entire range of the depth information of the image; extracting pixel sets existing in a preset unit section formed about the plurality of reference depth values to decompose the image of the first region of interest into the pixel sets; creating at least one pixel object by performing a labeling process with respect to each pixel set; removing a pixel object determined as noise by analyzing the pixel object; creating a candidate region for a region corresponding to the target in relation to at least one pixel object which is not determined as noise; determining if the detected candidate region corresponds to the target; detecting a target region by using the candidate region if the candidate region corresponds to the target; estimating a pose of the target by using the detected target region; and performing modeling with respect to the target; wherein each section formed about each reference depth value is overlapped with an adjacent section.