Method of simulating blur in digitally processed images

US8675045B2 · kind B2 · utility

Assignee

• Essilor International (Compagnie Generale d'Optique) · FR

Inventors

• Gildas Marin · Antony, FR
• Marc Le Renard · Charenton-le-Pont, FR

Key dates

• Filing date: Dec 19, 2008
• Grant date: Mar 18, 2014
• Expiry date: Oct 21, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/10021
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

In an image processing method, a first two-dimensional image (I(x, y)) of a three-dimensional scene is obtained. Each pixel location of a first image is associated with a respective distance parameter (z(x, y)) representing a distance of a viewer's eye to an object of the scene appearing at this pixel location in the first image. A respective spreading parameter (Φd(x, y)) is determined for each pixel location as a function of the distance parameter associated with this pixel location, of a dioptric power (Pcorr) of a portion of a correction lens simulated as placed along a ray extending between the viewer's eye and the object of the scene appearing at said pixel location in the first image, and of a simulated maximum accommodation power (Pacc) of the viewer's eye. A second, blurred two-dimensional image (I′(x, y)) is generated from the first image using a local convolution kernel varying across the image. This kernel can be made sparse, i.e. with a number of non-zero points much smaller than the number of points of a blur region whose dimension is given by the spreading parameter.