A method for inverse dithering a dithered image using a filter selected from a set of filters arranged in a preselected order is disclosed. Upon receipt of a selected portion of a dithered image, the selected portion is up-multiplied from a first amplitude resolution to a second amplitude resolution....http://www.google.com/patents/US6347160?utm_source=gb-gplus-sharePatent US6347160 - Increasing the bit depth of and filtering dithered images for the purpose of inverse dithering
