1. A depth map generating method comprising: dividing, through a processing component, a plurality of pixels of an image into a plurality of superpixels according to colors of the pixels; averaging, through the processing component, a plurality of depth values corresponding to the pixels within each of the superpixels to generate a plurality of average depth values corresponding to the superpixels; and generating, through the processing component, an aligned depth map relative to the superpixels of the image according to the average depth values.