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Method for detecting focal length by flashlight in auxiliary manner

An auxiliary detection and flash technology, applied in optics, focusing devices, color TV components, etc., can solve the problem of people being out of focus

Active Publication Date: 2012-03-28
ALTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional auto-focus method may judge the background or other things other than people as the subject of photography, and there is a problem that people who should be the focus of the shooting are out of focus

Method used

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  • Method for detecting focal length by flashlight in auxiliary manner
  • Method for detecting focal length by flashlight in auxiliary manner
  • Method for detecting focal length by flashlight in auxiliary manner

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Embodiment Construction

[0033] The detailed features and advantages of the present invention described below are sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly. The related objects and advantages of the present invention can be easily understood by those skilled in the art.

[0034] Please refer to figure 1 , which is a flow chart of a method for assisting in detecting focal length using a flashlight according to an embodiment of the present invention. The method for assisting focus detection by using a flashlight of the present invention is suitable for a digital camera with a flashlight. The method provides a target focal length for the digital camera according to an object containing at least one human face. Digital cameras applicable to the present invention may be but not limited to figure 2 .

[0035] The digital camera 100 includes a flash 102 , a lens device 104 , an aperture device 106 , a photo...

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Abstract

The invention discloses a method for detecting focal length by a flashlight in an auxiliary manner, which is suitable for a digital camera with the flashlight. The method comprises the following steps: firstly actuating the flashlight of the digital camera and capturing the image with face; then computing the exposure characteristic value of the face in the image; consulting a focal length contrast table according to the exposure characteristic value to obtain an initial focusing position; then executing a focusing procedure according to the initial focusing position and obtaining the target focal length; and computing the flash characteristic value of the image after obtaining the target focal length and setting the flashlight index and aperture value according to the flash characteristic value.

Description

technical field [0001] The invention relates to a method for assisting in detecting the focal length by using a flashlight, in particular to a method for assisting in detecting the focal length of an image with a human face by using a look-up table according to an exposure characteristic value. Background technique [0002] When using a camera to shoot images, it is necessary to correctly focus on the subject in order to obtain a clear photo, and today's general digital cameras have a built-in auto-focus function. Autofocus can be roughly divided into two categories, one is active autofocus (active autofocus), and the other is passive autofocus (passive autofocus). [0003] Active autofocus technology uses a group of infrared emitters or laser emitters and relative receivers to project light patterns on the subject, and then calculates the distance between the camera and the subject by methods such as triangulation. distance, and this distance is the focal length. Since th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/32H04N5/232G03B13/18
Inventor 周詹闵卢宗斌
Owner ALTEK CORP
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