1. A method comprising: accessing a left eye (LE) image and a right eye (RE) image that represent a 3D image; filtering the LE image and the RE image to reduce undesirable noise; determining, based on depth information relating to the LE and RE image, one or more first depths of a first 3D image feature in the 3D image; applying, after the filtering, one or more noise patterns to the first 3D image feature in the 3D image based on the one or more first depths of the first 3D image feature in the 3D image; determining, based on the depth information relating to the LE and RE image, one or more second depths of a second 3D image feature in the 3D image; and applying the one or more noise patterns to the second 3D image feature in the 3D image based on the one or more second depths of the second 3D image feature in the 3D image; wherein the one or more noise patterns are applied to the first 3D image feature with one or more first spatial frequency components that are different from one or more second spatial frequency components with which the one or more noise patterns are applied to the second 3D image feature.