Image and video processing apparatuses and methods

US11265575B2 · kind B2 · utility

Assignee

• Huawei Technologies Co., Ltd. · CN

Inventors

• Itsik Dvir · Haifa, IL
• Natan Peterfreund · Munich, DE
• Dror Irony · Munich, DE
• David Drezner · Raanana, IL
• Ady Ecker · Munich, DE
• Amiram Allouche · Munich, DE

Key dates

• Filing date: May 21, 2020
• Grant date: Mar 1, 2022
• Expiry date: Jun 1, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N19/60
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

The invention relates to an image processing apparatus for compressing or decompressing a segment of an image. The segment includes a plurality of pixels, each pixel includes a pixel value and a pixel position defined by a first coordinate system. The pixel values of the plurality of pixels form a pixel value vector. The apparatus includes processing circuitry configured to compress and/or decompress the segment. Compressing the segment includes computing a plurality of expansion coefficients by expanding the pixel value vector into a plurality of basis vectors that are discrete approximations of solutions of a boundary value problem of the Helmholtz equation on the segment of the image in a second coordinate system rotated relative to the first coordinate system. Decompressing the segment includes computing the pixel value vector by forming a linear combination of the basis vectors using the plurality of expansion coefficients.