The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2023
Filed:
Mar. 29, 2021
Advanced Micro Devices, Inc., Santa Clara, CA (US);
Yu-Huai Chen, Hsinchu, TW;
Po-Min Wang, Hsinchu, TW;
Advanced Micro Devices, Inc., Santa Clara, CA (US);
Abstract
An apparatus and method for efficiently determining a final camera lens position that captures a focused input image are described. An image signal processing system of a camera capable of performing automatic focus includes a camera lens, an image sensor, a focus engine, and a lens controller. Rather than generate a single contrast value based on digital signals corresponding to a single image, the focus engine uses at least two value generators to generate multiple contrast values. The value generators are bandpass filters with different bandwidths from one another. The focus engine uses the multiple contrast values, rather than from a single contrast value, to determine a search direction for finding a final lens position of the camera lens, when to use relatively large or coarse step sizes for updating the lens position, and when to use relatively small or fine step sizes for updating the lens position.