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Continuous focusing method for digital camera

A digital camera and focusing method technology, applied in the field of focusing, can solve the problems of prolonging the focusing time of digital cameras and affecting the power consumption of digital cameras, etc.

Inactive Publication Date: 2011-04-20
ALTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, in addition to prolonging the focusing time of the digital camera, it will also seriously affect the power consumption of the digital camera.

Method used

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  • Continuous focusing method for digital camera
  • Continuous focusing method for digital camera
  • Continuous focusing method for digital camera

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Experimental program
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no. 2 example

[0055] The second embodiment includes the following steps:

[0056] Step 211: set at least one sampling area in the preview image, the sampling area has a plurality of image pixels;

[0057] Step 212: Comparing the pixel values ​​of all adjacent two image pixels in the sampling area respectively to obtain a plurality of comparison difference values;

[0058] Step 214: If the contrast difference is greater than the preset threshold value, accumulate the clear value; and

[0059] Step 215: Repeat the steps of calculating and accumulating sharpness values ​​until all image pixels in the sampling area are completed.

[0060] In the process of calculating the contrast difference in step 212, 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 comparison pixel 511 may be selected in a horizontally adjacent or ve...

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Abstract

A continuous focusing method for digital camera is applied to judging the digital camera whether to perform the focusing program when the image capture preview stage of the digital camera switches from the first scene to the second scene. The continuous focusing method comprises the steps of: obtaining a preview image of the second scene, performing the preview image fuzzy detection program to obtain corresponding clear value, judging whether the clear value exceeds the focusing threshold value, and if not, performing the focusing program. When the clear value exceeds the focusing threshold value, the digital camera still keeps the present focusing focal length, so the focusing focal length of the second scene is same as the focusing focal length of the first scene and the repeated focusing is unnecessary.

Description

technical field [0001] The invention relates to a focusing method, in particular to a continuous focusing method for determining whether to adjust the focus focal length when a digital camera switches scenes. 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 presses the shutter button halfway after aiming at the object to be photographed, and the digital camera enters the auto focusing stage (Auto Focusing) at this moment. The third is that the user fully presses the shutter, and the digital camera enters the shooting stage (Shooting) at this time. [0003] The so-called imaging preview stage refers to the preview of framing with the digital camera before the user presses the shutter. In other words, the digital camera will continuously capture different scene i...

Claims

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Application Information

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IPC IPC(8): H04N5/232G06T5/00
Inventor 周詹闵蔡嘉伦严志彬
Owner ALTEK CORP
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