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Imaging system and method of focusing image sensor

An image sensor, imaging system technology, applied in the field of image sensors, can solve problems such as slowness

Active Publication Date: 2014-12-03
OMNIVISION TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Traditional frame-to-frame autofocus methods are relatively slow because two image frames must be acquired in order to make a single comparison

Method used

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  • Imaging system and method of focusing image sensor
  • Imaging system and method of focusing image sensor
  • Imaging system and method of focusing image sensor

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Embodiment Construction

[0016] As will be shown, this disclosure discloses methods and apparatus for image sensors with fast intra-focus. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. One skilled in the relevant art will recognize, however, that the techniques described herein may be practiced without one or more of the specific details or with other methods, components, materials, etc. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring certain aspects.

[0017] Reference throughout this specification to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example includes In at lea...

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Abstract

A method of focusing an image sensor includes scanning a first portion of an image frame from an image sensor a first time at a first rate to produce first focus data. A second portion of the image frame from the image sensor is scanned at a second rate to read image data from the second portion. The first rate is greater than the second rate. The first portion of the image frame is scanned a second time at the first rate to produce second focus data. The first focus data and the second focus data are compared, and the focus of a lens is adjusted in response to the comparison of the first focus data and the second focus data.

Description

[0001] Related applications [0002] This application claims the benefit of U.S. Provisional Application No. 61 / 825,413, filed May 20, 2013, entitled "IMAGE SENSOR WITH INTRA-FRAME FAST AUTOFOCUS." technical field [0003] The present invention generally relates to image sensors. More specifically, examples of the invention relate to image sensors with autofocus. Background technique [0004] Traditionally, autofocus has been done frame-by-frame. The lens of the image sensor moves throughout the autofocus process. First, a first frame is obtained, and a certain property of the frame is obtained, eg a contrast value. Then, a second frame is obtained, and the same contrast value is obtained. The first and second contrast values ​​are compared to see if the frame will be in focus or out of focus. The sharper contrast indicator will be in focus. Adjust the direction of lens movement accordingly. If the image is to be in focus, the lens keeps moving in the same direction....

Claims

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Application Information

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IPC IPC(8): H04N5/341H04N5/232
CPCH04N5/335H04N23/673H04N25/00
Inventor 代铁军船津英一吴东晖杨征谢晓
Owner OMNIVISION TECH INC