Rate controlled image and texture data compression

US11335032B2 · kind B2 · utility

Assignee

• Facebook Technologies, LLC · US

Inventors

• Cheng-Ping Chang · Hsinchu, TW
• Zhi Zhou · Issaquah, US
• Richard Webb · Sammamish, US
• Richard Lawrence Greene · Austin, US

Key dates

• Filing date: Aug 26, 2020
• Grant date: May 17, 2022
• Expiry date: Nov 20, 2040

Classification

• Technology area (CPC —): General

Abstract

In one embodiment, a computing system may determine a quantization range having a first quantization endpoint and a second quantization endpoint. While fixing the second quantization endpoint to an initial value determined based on the color range, one of a plurality of first candidate values for the first quantization endpoint is selected based on a plurality of corresponding first quantization errors. While fixing the first quantization endpoint to the selected first candidate value, one of a plurality of second candidate values for the second quantization endpoint is selected based on a plurality of corresponding second quantization errors. The computing system may define quantization levels corresponding to the bit depth using the quantization range defined by the first quantization endpoint and the second quantization endpoint, and then encode the one or more color components of the pixel region using the quantization levels.