Quick focusing method of digital camera

A technology of digital camera and focusing method, which is applied in the field of focusing, can solve the problems that digital cameras cannot clearly shoot digital images and waste power, and achieve the effect of reducing focusing time and power consumption

Inactive Publication Date: 2011-04-27
ALTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Or if the subject moves during the autofocus phase, the digital camera will not be able to clearly capture digital images
In this way, not only will the power be wasted in vain, but the user has to wait for the digital camera to be adjusted before taking pictures

Method used

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  • Quick focusing method of digital camera
  • Quick focusing method of digital camera
  • Quick focusing method of digital camera

Examples

Experimental program
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no. 2 example

[0084] The second embodiment comprises the following steps:

[0085] Step S311: further setting at least one sampling area in the target image, the sampling area has a plurality of image pixels;

[0086] Step S312: Comparing the pixel values ​​of all adjacent two image pixels in the sampling area to obtain a plurality of comparison difference values;

[0087] Step S314: if the contrast difference is greater than the preset threshold, accumulating the sharpness value; and

[0088] Step S315: Repeat the steps of calculating and accumulating sharpness values ​​until all image pixels in the sampling area are completed.

[0089] In the process of calculating the contrast difference in step S312 in the aforementioned first embodiment and the second embodiment, two adjacent image pixels are respectively selected for processing. Here, the image pixel to be compared is defined as the target pixel 512 , and another selected adjacent pixel is defined as the comparison pixel 511 . The ...

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Abstract

The invention discloses a quick focusing method of a digital camera, used for judging whether focusing focal distance of the digital camera is necessary to be adjusted when the digital camera is in an auto focusing stage. The quick focusing method comprises the following steps: obtaining a target image when the digital camera is at reference focal distance; performing a fuzzy detection program on the target image to obtain a clearness valve; setting a focusing focal distance interval containing the reference focal distance when the clearness value is between a lower limit focusing threshold and an upper limit focusing threshold; respectively obtaining corresponding comparison images at different focusing focal distances in the focusing focal distance interval; calculating a comparison value of each comparison image; and solving the comparison value and a target focal distance by a quadratic curve approximation method, and performing photographing actions after adjusting a lens of the digital camera to the set target focal distance.

Description

technical field [0001] The present invention relates to a focusing method, in particular to a focusing method in which a digital camera decides to adjust the focusing focal length during the automatic focusing stage. Background technique [0002] When a user uses a digital camera to take a photo, it is often divided into several stages. The first is to turn on the digital camera, at this time the digital camera enters the so-called live view stage. The second is that the user half-presses the shutter after aiming at the object to be photographed, and at the same time the digital camera enters the auto-focus stage. The third is that the user fully presses the shutter, and at this time the digital camera enters the shooting stage (Shooting) and shoots corresponding video frames. [0003] The auto-focus stage refers to the focus stage before the subject is focused and shooting is not pressed. To put it simply, it is the action process of focusing on the subject when the digi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36
Inventor 周詹闵蔡嘉伦严志彬
Owner ALTEK CORP
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