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Systems and methods for continuous autofocus (caf)

A technology in objects and images, applied in parts of TV systems, parts of color TVs, image enhancement, etc., to solve problems such as loss of focus

Inactive Publication Date: 2020-08-11
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing autofocus systems can lose focus when the subject moves relative to the camera

Method used

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  • Systems and methods for continuous autofocus (caf)
  • Systems and methods for continuous autofocus (caf)
  • Systems and methods for continuous autofocus (caf)

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Embodiment Construction

[0031] The following detailed description is directed to certain specific embodiments of the invention. However, the invention can be embodied in a multitude of different ways. It should be apparent that aspects herein may be embodied in a variety of forms and that any specific structure, function, or both disclosed herein is merely representative. Based on the teachings herein one skilled in the art should appreciate that an aspect disclosed herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, any number of the aspects set forth herein may be used to implement an apparatus or practice a method. Furthermore, such an apparatus may be implemented using other structure, functionality, or structure and functionality in addition to or different from one or more of the aspects set forth herein Or can practice this method.

[0032]Additionally, the systems and methods described herein can b...

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Abstract

The present invention discloses systems and methods for continuous autofocus. In some aspects, the focused object is selected from the camera's field of view. At least one region of the field of view containing the object is monitored for changes. Regions of the field of view not containing the object may not be monitored, thus improving efficiency and speed. The method may trigger a focus event if a change in image content of the monitored area occurs. If the object moves to a different area of ​​the field of view, the method detects the movement and adjusts the area of ​​the image being monitored to maintain focus on the object. In some aspects, the size of the object is also monitored. If the size of the object changes, a focus event may be triggered depending on whether the amount of change exceeds a predetermined parameter.

Description

technical field [0001] The present application relates generally to imaging systems, and more particularly to tracking objects for continuous autofocus. Background technique [0002] Autofocus systems automatically adjust the distance between lens elements and the image sensor to keep subjects in focus. Many of these systems determine optimal focus based on the high frequency content within the image being focused. For example, a lens position that maximizes high frequency content may represent an image with the best contrast ratio and thus best focus. However, existing autofocus systems can lose focus when the subject moves relative to the camera. Accordingly, a need exists for a system and method that continuously and automatically maintains focus on a moving object. Contents of the invention [0003] What follows is an overview of sample aspects of the invention. For convenience, one or more aspects of the invention may be referred to herein simply as "aspects". ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232
CPCH04N23/673H04N23/675H04N23/61H04N23/62H04N23/611H04N23/631H04N23/635G06T7/80G06T7/38G06T7/571G06T7/11G06T7/187G06T2207/10148G06T2207/20221G06T2210/12G06T2210/61H04N23/67H04N23/54G06T2207/10004G06T2207/10028
Inventor 邓凡马磊陈良春
Owner QUALCOMM INC
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