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Automatic focusing method and apparatus for mobile terminal and mobile terminal

A mobile terminal and automatic focusing technology, applied in the field of photography, can solve the problems of inability to identify the subject, focus value error, out of focus, etc. Out-of-focus effect

Inactive Publication Date: 2016-06-22
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the focus area is at the edge of the screen, because the image sensor’s light sensitivity at the edge is weaker than that at the middle position, the resulting focus value will have a certain error. If the subject in the focus area is a point light source, It is likely that the subject cannot be recognized as a point light source due to the inaccurate focus value, so that the mobile terminal cannot perform related processing on the point light source, resulting in inaccurate focus (out of focus)

Method used

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  • Automatic focusing method and apparatus for mobile terminal and mobile terminal
  • Automatic focusing method and apparatus for mobile terminal and mobile terminal
  • Automatic focusing method and apparatus for mobile terminal and mobile terminal

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0024] figure 1 It is a schematic flowchart of an autofocus method for a mobile terminal provided in Embodiment 1 of the present invention. The method can be executed by an autofocus device of a mobile terminal, wherein the device can be implemented by software and / or hardware, and can generally be integrated in a mobile terminal . Such as figure 1 As shown, the method includes:

[0025] Step 101, when a focus event is triggered, if it is detected that the current focus area is within a preset range around the screen, determine a first point light source determination condition.

[0026] Wherein, the first point light source judging condition is looser than the second point light source judging condition, and the second point light source judging condition corresponds to the focus area being outside the preset range around the screen.

[0027] Exemplarily, the mobile terminal in this embodiment may specifically be devices such as a mobile phone, a tablet computer, and a dig...

Embodiment 2

[0038] Figure 4 It is a schematic flowchart of an autofocus method for a mobile terminal provided in Embodiment 2 of the present invention. This embodiment is optimized based on the above-mentioned embodiment, and refines the judgment conditions of the first point light source and the second point light source. . Such as Figure 4 As shown, the method of the present embodiment includes the following steps:

[0039] Step 401, when the focus event is triggered, if it is detected that the current focus area is within the preset range around the screen, the first point light source determination condition is determined as the focus value of the subject image acquired when the lens is in a different position The ratio of the focus value of the maximum focus value to the minimum focus value is higher than the first preset threshold.

[0040] Wherein, the second point light source determination condition is that the ratio of the focus value of the maximum focus value to the minim...

Embodiment 3

[0049] Figure 5 It is a schematic flowchart of an auto-focusing method for a mobile terminal provided by Embodiment 3 of the present invention. This embodiment is optimized on the basis of the foregoing embodiments, and refines the determination condition for determining the first point light source. Such as Figure 5 As shown, the method of the present embodiment includes the following steps:

[0050] Step 501, when the focus event is triggered, if it is detected that the current focus area is within the preset range around the screen, the adjustment value is determined according to the minimum distance value between the center point of the current focus area and the edge of the screen, and the adjustment value is proportional to the minimum distance value Inverse proportional relationship.

[0051] Exemplarily, the shortest distance value among the vertical distances between the center point of the current focus area and the four boundary lines of the screen is the minimu...

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Abstract

The embodiment of the invention discloses an automatic focusing method and apparatus for a mobile terminal and the mobile terminal. The method includes the steps of determining a first spot light source determining condition when a focusing event is triggered, and the current focusing area is detected to be in a preset scope on the periphery of a screen, wherein the first spot light source determining condition is less restrict than a second spot light source determining condition corresponding to the focusing area outside the preset scope on the periphery of the screen; determining whether the current shot objected is a spot light source according to the first spot light source determining condition, and executing corresponding focusing operation according to the determining result. When the technical scheme is adopted, the probability of mistakenly determining a spot light source as a non-spot light source is reduced. The scheme of the mobile terminal determining whether a shot object is a spot light source in an automatic focusing process is optimized, focusing accuracy is ensured, defocusing phenomenon is prevented, and the user experience is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of photographing, and in particular to an automatic focusing method and device for a mobile terminal and a mobile terminal. Background technique [0002] With the rapid development of mobile terminal photography technology, users more and more frequently use mobile terminals to take pictures, so as to conveniently record the scenery and wonderful moments around them. [0003] At present, most of the cameras of mobile terminals support an auto-focus function, so that users can easily take clear photos. During the autofocus process, the motor in the camera will constantly change the lens position, and the image sensor will obtain the focus value (FocusValue, FV) of the subject image corresponding to different lens positions according to the collected information (which can be understood as contrast ), and the lens position when the focus value peaks corresponds to the final focus point. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B7/28G03B13/36
CPCG02B7/28G03B13/36
Inventor 李小朋
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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