Focusing method and focusing system based on a distance sensor of mobile terminal

Patent metadata

Field	Value
Publication number	US-2017257555-A1
Application number	US-201515308600-A
Country	US
Kind code	A1
Filing date	Oct 30, 2015
Priority date	Apr 27, 2015
Publication date	Sep 7, 2017
Grant date	—

Abstract

A focusing method and a focusing system based on a distance sensor of mobile terminal is provided. The method may include: acquiring an initial distance between a camera and an object to be shot by using the distance sensor; judging whether the distance between the camera and the object changed; in response to judging that the distance changed, acquiring a micro-adjustment range of a motor according to the distance; controlling the motor to move based on the micro-adjustment ranges; collecting images from the camera in a real-time manner; acquiring focus values of the collected images; and moving the motor to a position corresponding to a largest focus value of the focus values to focus the camera.

First claim

1 - 4 . (canceled)

5 . A focusing method based on a distance sensor of a mobile terminal, comprising:
acquiring and storing an initial distance between a camera and an object to be shot by using the distance sensor after detecting that a shooting function of the mobile terminal has started; judging whether a current distance acquired by the distance sensor is equal to the initial distance; in response to the judging that the current distance is not equal to the initial distance, querying a correspondence table to acquire a target micro-adjustment range of the motor according to the current distance, controlling the motor to move within the target micro-adjustment range, and collecting images from the camera; and acquiring focus values of the images when the motor moves into different positions within the target micro-adjustment range, and controlling the motor to move to a position corresponding to a largest focus value of the focus values, thereby focusing the camera.

6 . The method according to claim 5 , wherein the method further comprises, prior to the judging:
presetting and storing the correspondence table of distances between the distance sensor and the object to be shot and associated micro-adjustment ranges of the motor.

7 . The method according to claim 5 , wherein the method further comprises:
controlling the motor to keep still at a current position in response to the judging that the current distance is equal to the initial distance.

8 . The method according to claim 5 , wherein the collecting of the images is in a real-time manner.

9 . The method according to claim 5 , wherein the acquiring of the focus values of the images comprises:
acquiring and storing the focus values of the images when the motor moves into the different positions within the target micro-adjustment range; comparing all of the focus values, and acquiring the position corresponding to the largest focus value; and controlling the motor to move to the position corresponding to the largest focus value of the focus values, thereby focusing the camera.

10 . A focusing system based on a distance sensor of a mobile terminal, comprising:
a detection and acquisition module acquiring and storing an initial distance between a camera and the object to be shot by using the distance sensor after detecting that a shooting function of the mobile terminal has started; a judgment module judging whether a current distance acquired by the distance sensor is equal to the initial distance; in response to the judgment module judging that the current distance is not equal to the initial distance, a query and image collection module querying a correspondence table to acquire the target micro-adjustment range of a motor according to the current distance, controlling the motor to move within the target micro-adjustment range, and collecting images from the camera; and an acquisition and control module acquiring focus values of the images when the motor moves into different positions within the target micro-adjustment range, and controlling the motor to move to a position corresponding to a largest focus value of the focus values, thereby focusing the camera.

11 . The system according to claim 10 , further comprising:
a presetting and storage module presetting and storing the correspondence table of distances between the distance sensor and the object to be shot and associated micro-adjustment ranges of the motor.

12 . The system according to claim 10 , wherein the judgment module further comprises:
a judgment and control unit controlling the motor to keep still at a current position in response to the judging that the current distance is equal to the initial distance.

13 . The system according to claim 10 , wherein the query and image collection module comprises:
a detection and acquisition unit for acquiring the current distance between the distance sensor and the object to be shot in response to judging that the current distance has changed; a query unit querying the correspondence table to acquire the target micro-adjustment range of the motor according to the current distance; and a control and collection unit for controlling the motor to move within the target micro-adjustment range, and collecting images from the camera.

14 . The system according to claim 10 , wherein the acquisition and control module comprises:
an acquisition and storage unit acquiring and storing the focus values of the images when the motor moves into the different positions within the target micro-adjustment range; a comparison unit comparing all of the focus values, and acquiring the position corresponding to the largest focus value of the focus values; and a control unit controlling the motor to move to a position corresponding to a largest focus value of the focus values, thereby focusing the camera.

15 . A storage medium for storing a processor-executable instruction therein, wherein the processor-executable instruction is configured to cause, when executed by a processor:
acquiring and storing an initial distance between a camera and the object to be shot by using the distance sensor after detecting that a shooting function of the mobile terminal has started; judging whether a current distance acquired by the distance sensor is equal to the initial distance; in response to the judging that the current distance is not equal to the initial distance, querying the correspondence table to acquire the target micro-adjustment range of the motor according to the current distance, controlling the motor to move within the target micro-adjustment range, and collecting images from the camera; and acquiring focus values of the images when the motor moves into different positions within the target micro-adjustment range, and controlling the motor to move to a position corresponding to a largest focus value of the focus values, thereby focusing the camera.

16 . The storage medium according to claim 15 , wherein the processor-executable instruction is further configured to cause, prior to the judging:
presetting and storing the correspondence table of distances between the distance sensor and the object to be shot and associated micro-adjustment ranges of the motor.

17 . The storage medium according to claim 15 , wherein the processor-executable instruction is further configured to cause:
controlling the motor to keep still at a current position in response to the judging that the current distance is equal to the initial distance.

18 . The storage medium according to claim 15 , wherein the processor-executable instruction is further configured to cause the collecting of the images in a real-time manner.

19 . The storage medium according to claim 15 , wherein the processor-executable instruction is further configured so that the acquiring of the focus values comprises:
acquiring and storing the focus values of the images when the motor moves into the different positions within the target micro-adjustment range; comparing all of the focus values, and acquiring the position corresponding to the largest focus value; and controlling the motor to move to the position corresponding to the largest focus value of the focus values, thereby focusing the camera.

20 . The system according to claim 10 , wherein the collecting of the images from the camera is in a real-time manner.

Assignees

• Huizhou Tcl Mobile Communication Co Ltd

Inventors

• Li Wenyuan

Classifications

• H04N23/671 Primary

  in combination with active ranging signals, e.g. using light or sound signals emitted toward objects · CPC title

• G02B7/38

  measured at different points on the optical axis {, e.g. focussing on two or more planes and comparing image data} · CPC title

• H04M2250/52

  including functional features of a camera · CPC title

• H04M2250/12

  including a sensor for measuring a physical value, e.g. temperature or motion · CPC title

• G03B13/36

  Autofocus systems · CPC title