Method of generating a mask image of membership of single pixels to certain chromaticity classes and of adaptive improvement of a color image

US7528991B2 · kind B2 · utility

Assignee

• STMicroelectronics SA

Inventors

• Filippo Naccari · Mascalucia, IT
• Alfio Castorina · Trecastagni, IT
• Arcangelo Ranieri Bruna · Canicattì, IT
• Alessandro Capra · Gravina di Catania, IT
• Silvia Maria Francesca Cariolo · Mascalucia, IT
• Sebastiano Battiato · San Gregorio di Catania, IT
• Giovanni Gallo · Catania, IT

Key dates

• Filing date: Aug 31, 2005
• Grant date: May 5, 2009
• Expiry date: May 30, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G06T2207/20016
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

In the method, the membership image is produced through a multi-stage process that contemplates a first punctual classification stage generating a rough membership image, followed by a low-pass filtering of regionalization of the image through a down-sampling of the image followed by an up-sampling of the image, and in a further step of merging the regions that overcomes the superposition effects induced by the low-pass filtering operation. The so generated membership image contains semantic information of the input image that may be used for effectively implementing an adaptive correction/improvement of the color of the input image. For an adaptive correction/improvement of the color, the encoded data of the generated membership image is fed in parallel to the data of the real image to an adaptive modification block of the color of the image pixels.