1. A method implemented in an image processing device for performing two-dimensional (2D) to stereoscopic conversion, comprising: retrieving, by the image processing device, a 2D image; determining, by the image processing device, at least one region within the 2D image having a high gradient characteristic relative to other regions within the 2D image; identifying, by the image processing device, an out-of-focus region based on the at least one region having a high gradient characteristic; deriving, by the image processing device, a color model according to the out-of-focus region; and based on the color model, providing, by the image processing device, a depth map for 2D-to-stereoscopic conversion.