Patent ID: 7298383
Filing Date: 2007-11-20
Classification: G06T

Abstract:
1. A method of modifying at least one of contrast and density of the pixels of an image represented by a digital image signal comprising the steps of: (a) displaying said image on a display screen, (b) displaying a density axis and contrast amplification axis of a coordinate system, (c) in response to a user input, moving an indicium in at least one of the directions of said axes, (d) changing contrast of the displayed image upon receiving said user input for movement of said indicium in the direction of said contrast amplification axis, and (e) changing density of the displayed image upon receiving said user input for movement of said indicium in the direction of said density axis, wherein independent change of contrast and density is obtained by modifying a multi-scale representation of said image, wherein the modification is derived from at least two gradient functions determined at different scales, and wherein a gradient function at a specific scale specifies how contrast amplification at a scale depends on density.