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DCC acquisition method, focusing method and system, camera module and terminal

A technology of a camera module and an acquisition method, applied in the field of photography, can solve problems such as out-of-focus, affecting the user's applicable experience, etc.

Active Publication Date: 2020-08-18
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the DCC is not considered to change with the change of the environment and the object distance, and it is easy to cause out of focus, which greatly affects the user's application experience. The purpose is to provide a DCC acquisition method, focusing method and system, camera module and terminal

Method used

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  • DCC acquisition method, focusing method and system, camera module and terminal
  • DCC acquisition method, focusing method and system, camera module and terminal
  • DCC acquisition method, focusing method and system, camera module and terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Considering that under different light sources and distances, the DCC value in the camera module will also be different, as shown in the following table:

[0104]

[0105] The above table is the result taken by the Shield PD module. The background image uses ISO-12233chart (resolution test target board), and the standard D65 light source is used in the Samsung laboratory test, and the data in the above table are DCC at the center of the image Round the value, the DCC at the center of the image that comes with the module is rounded to 24.

[0106] It can be seen from the table that for the same module, under the same light source, the DCC will change at different distances; at the same distance, the DCC will also change under different light sources. In this embodiment, the DCC can be effectively and dynamically adjusted to ensure the focusing accuracy of the PDAF focusing mode, specifically:

[0107] Such as figure 1 As shown, the method for obtaining the defocus c...

Embodiment 2

[0120] Such as figure 2 As shown, the acquisition method of the defocus conversion coefficient in the camera module of this embodiment is a further improvement on Embodiment 1, specifically:

[0121] Before step S101, it also includes:

[0122] S1001. Obtain a focus trigger instruction;

[0123] S1002. Determine whether the focus trigger instruction satisfies a preset condition, if yes, execute step S101; if not, determine to use the CDAF focusing method for focusing.

[0124] Wherein, the preset conditions include but are not limited to that the phase difference satisfies the first set condition, the confidence level corresponding to the phase difference satisfies the second set condition, the brightness of the current scene satisfies the third set condition, and so on. The preset condition can also be flexibly adjusted according to actual conditions.

[0125] Also include before step S103:

[0126] Acquiring the first degree of confidence corresponding to the first phas...

Embodiment 3

[0176] Such as Figure 4 As shown, the focusing method of the camera module in this embodiment is realized by the acquisition method of the defocus conversion coefficient in the camera module in Embodiment 1 or 2.

[0177] When the target defocus conversion coefficient and intercept parameters of the target straight line are obtained according to the current position data and the current phase difference obtained after each movement of the motor, the focusing method of this embodiment includes:

[0178] S201. Calculate and obtain the target displacement amount corresponding to the motor according to the target defocus conversion coefficient and the intercept parameter;

[0179] S202. Drive the motor to move the target displacement amount to focus.

[0180] In this embodiment, based on adaptively recalculating the new DCC during the focusing process, the corresponding displacement of the motor is calculated, and then the focus is performed according to the displacement, which ...

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Abstract

The invention discloses a DCC acquisition method, a DCC focusing method and system, a camera module and a terminal. The DCC acquisition method comprises the following steps: acquiring an image frame set; obtaining a first phase difference and a first definition value of the target image frame; obtaining a target phase difference; acquiring a first displacement of a motor in the camera module; obtaining the current phase difference, the current definition value and the current position data of the moved current image frame; when the current definition value is greater than the first definitionvalue, recording the focusing frequency; and forming a new image frame set according to the current image frame, re-executing the step of obtaining the target phase difference according to the first phase difference until a set condition is reached, and calculating to obtain a target defocusing conversion coefficient according to the current position data obtained after the motor is moved each time and the current phase difference. According to the method, the DCC can be adaptively and dynamically adjusted, so that the focusing precision of a PDAF focusing mode is improved while the focusing time is shortened, and the focusing rate is increased.

Description

technical field [0001] The present invention relates to the field of camera technology, and in particular to a DCC (Defocus Conversion Coefficient, defocus conversion coefficient) acquisition method, focusing method, system, camera module and terminal. Background technique [0002] At present, two focusing methods, CDAF (Contrast Detection Auto Focus, contrast detection auto focus) and PDAF (Phase Detection Auto Focus, phase detection auto focus), are mainly used on terminals (such as mobile phones). Among them, CDAF has accurate focusing, but the focusing speed is slow; PDAF has fast focusing speed, but the focusing accuracy is low. [0003] Due to the differences in camera modules, the DCC value of each module is different, and the process of calculating DCC varies with each manufacturer. Among them, the method of obtaining DCC is generally as follows: (1) Fix the background image and the module, generally making the distance between the two 10-20cm; (2) Divide the module...

Claims

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/67H04N23/672
Inventor 杨辉强
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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