Method and terminal for measuring angle

• US 9,897,439 B2
• Filed: 02/09/2015
• Issued: 02/20/2018
• Est. Priority Date: 05/26/2014
• Status: Active Grant

• Current Assignee: Xiaomi Inc. (Xiaomi Corp.)
• Original Assignee: Xiaomi Inc. (Xiaomi Corp.)
• Inventors: Hu, Xiaowei, Han, Wei, Zhu, Yin
• Primary Examiner(s): Chevalier, Robert
• Application Number:
  US14/616,919
• Publication Number:
  US 20150338211A1
• Time in Patent Office: 1,107 Days
• Field of Search: 348141, 348135, 348140, 348143
• CPC Class Codes: G01B 11/26 for measuring angles or tapers; for testing the alignment of axes
• CPC Class Codes: G06V 10/243 by compensating for image skew or non-uniform image deformations
• CPC Class Codes: G06V 20/20 in augmented reality scenes

Abstract

A method for a terminal to measure an angle, includes: displaying a horizontal reference line, a measurement line, and an object being imaged by a camera on a display interface of the terminal, a plane determined by the measurement line and the horizontal reference line being parallel with the display interface, and the measurement line being relatively static with respect to the display interface; during a process in which the terminal is turned to cause, on the display interface, an edge of the object to be parallel with the measurement line, obtaining one or more angles between the measurement line and the horizontal reference line; and determining an angle obtained when the edge of the object is parallel with the measurement line as an angle between the object and a horizontal plane.

Claims

1. A method performed by a mobile terminal to measure an angle of an object, comprising:

displaying, on a display interface of the mobile terminal, a horizontal reference line and a measurement line relatively static with respect to the display interface, the measurement line and the horizontal reference line determining a plane parallel with the display interface;

detecting whether the mobile terminal is in an inclined state;

when it is detected that the mobile terminal is in the inclined state, starting a camera of the mobile terminal and imaging the object via the camera;

displaying the object on the display interface;

during a process in which the mobile terminal is turned to cause, on the display interface, an edge of the object to be parallel with the measurement line, obtaining one or more angles between the measurement line and the horizontal reference line;

determining an angle obtained when the edge of the object is parallel with the measurement line as an angle between the object and a horizontal plane; and

displaying the determined angle on the display interface.

2. The method according to claim 1, wherein the detecting of whether the mobile terminal is in an inclined state comprises:

measuring an inclined angle between the mobile terminal and the horizontal plane;

detecting whether the inclined angle falls into a preset angle range; and

if it is detected that the inclined angle falls into the preset angle range, determining that the mobile terminal is in the inclined state.

3. The method according to claim 1, wherein the obtaining of a first angle of the one or more angles between the measurement line and the horizontal reference line comprises:

if the measurement line is parallel with or coincident with the horizontal reference line at an initial moment, measuring a rotating angle of the measurement line with respect to the horizontal reference line, and determining the rotating angle as the first angle between the measurement line and the horizontal reference line; and

if there is an initial angle between the measurement line and the horizontal reference line at the initial moment, measuring the rotating angle of the measurement line with respect to the horizontal reference line, calculating an angle difference by subtracting the initial angle from the rotating angle, and determining the angle difference as the first angle between the measurement line and the horizontal reference line.

4. The method according to claim 2, wherein the obtaining of a first angle of the one or more angles between the measurement line and the horizontal reference line comprises:

if the measurement line is parallel with or coincident with the horizontal reference line at an initial moment, measuring a rotating angle of the measurement line with respect to the horizontal reference line, and determining the rotating angle as the first angle between the measurement line and the horizontal reference line; and

if there is an initial angle between the measurement line and the horizontal reference line at the initial moment, measuring the rotating angle of the measurement line with respect to the horizontal reference line, calculating an angle difference by subtracting the initial angle from the rotating angle, and determining the angle difference as the first angle between the measurement line and the horizontal reference line.

5. The method according to claim 1, wherein the object is a first object and, when the camera images a second object, the method further comprising:

during a process in which the mobile terminal is turned to cause, on the display interface, an edge of the second object to be parallel with the measurement line, obtaining one or more angles between the measurement line and the horizontal reference line;

determining an angle obtained when the edge of the second object is parallel with the measurement line as an angle between the second object and the horizontal plane;

calculating an angle difference by subtracting the angle between the second object and the horizontal plane from the angle between the first object and the horizontal plane; and

determining an absolute value of the angle difference as an angle between the first object and the second object.

6. A mobile terminal, comprising:

a camera;

a display interface;

a processor; and

a memory configured to store instructions executable by the processor;

wherein the processor is configured to;

display, on the display interface, a horizontal reference line and a measurement line relatively static with respect to the display interface, the measurement line and the horizontal reference line determining a plane parallel with the display interface;

detect whether the mobile terminal is in an inclined state;

when it is detected that the mobile terminal is in the inclined state, start the camera and control the camera to image an object;

display the object on the display interface;

during a process in which the terminal is turned to cause, on the display interface, an edge of the object to be parallel with the measurement line, obtain one or more angles between the measurement line and the horizontal reference line;

determine an angle obtained when the edge of the object is parallel with the measurement line as an angle between the object and a horizontal plane; and

display the determined angle on the display interface.

7. The mobile terminal according to claim 6, wherein the processor is further configured to:

measure an inclined angle between the mobile terminal and the horizontal plane;

detect whether the inclined angle falls into a preset angle range; and

if it is detected that the inclined angle falls into the preset angle range, determine that the mobile terminal is in the inclined state.

8. The terminal according to claim 6, wherein the processor is further configured to:

if the measurement line is parallel with or coincident with the horizontal reference line at an initial moment, measure a rotating angle of the measurement line with respect to the horizontal reference line, and determine the rotating angle as a first one of the one or more angles between the measurement line and the horizontal reference line; and

if there is an initial angle between the measurement line and the horizontal reference line at the initial moment, measure the rotating angle of the measurement line with respect to the horizontal reference line, calculate an angle difference by subtracting the initial angle from the rotating angle, and determine the angle difference as the first one of the one or more angles between the measurement line and the horizontal reference line.

9. The terminal according to claim 7, wherein the processor is further configured to:

if the measurement line is parallel with or coincident with the horizontal reference line at an initial moment, measure a rotating angle of the measurement line with respect to the horizontal reference line, and determine the rotating angle as a first one of the one or more angles between the measurement line and the horizontal reference line; and

if there is an initial angle between the measurement line and the horizontal reference line at the initial moment, measure the rotating angle of the measurement line with respect to the horizontal reference line, calculate an angle difference by subtracting the initial angle from the rotating angle, and determine the angle difference as the first one of the one or more angles between the measurement line and the horizontal reference line.

10. The terminal according to claim 6, wherein the object is a first object and, when the camera images a second object, the processor is further configured to:

during a process in which the mobile terminal is turned to cause, on the display interface, an edge of the second object to be parallel with the measurement line, obtain one or more angles between the measurement line and the horizontal reference line;

determine an angle obtained when the edge of the second object is parallel with the measurement line as an angle between the second object and the horizontal plane;

calculate an angle difference by subtracting the angle between the second object and the horizontal plane from the angle between the first object and the horizontal plane; and

determine an absolute value of the angle difference as an angle between the first object and the second object.

11. A non-transitory computer-readable storage medium having stored therein instructions that, when executed by a processor of a mobile terminal, cause the mobile terminal to perform a method for measuring an angle of an object, the method comprising:

displaying, on a display interface of the mobile terminal, a horizontal reference line and a measurement line relatively static with respect to the display interface, the measurement line and the horizontal reference line determining a plane parallel with the display interface;

detecting whether the mobile terminal is in an inclined state;

when it is detected that the mobile terminal is in the inclined state, starting a camera and controlling the camera to image the object;

displaying the object on the display interface;

during a process in which the terminal is turned to cause, on the display interface, an edge of the object to be parallel with the measurement line, obtaining one or more angles between the measurement line and the horizontal reference line;

determining an angle obtained when the edge of the object is parallel with the measurement line as an angle between the object and a horizontal plane; and

displaying the determined angle on the display interface.

12. The non-transitory computer-readable storage medium according to claim 11, wherein the detecting of whether the mobile terminal is in an inclined state comprises:

measuring an inclined angle between the mobile terminal and the horizontal plane;

detecting whether the inclined angle falls into a preset angle range; and

if it is detected that the inclined angle falls into the preset angle range, determining that the mobile terminal is in the inclined state.

13. The non-transitory computer-readable storage medium according to claim 11, wherein the obtaining of a first angle of the one or more angles between the measurement line and the horizontal reference line comprises:

if the measurement line is parallel with or coincident with the horizontal reference line at an initial moment, measuring a rotating angle of the measurement line with respect to the horizontal reference line, and determining the rotating angle as the first angle between the measurement line and the horizontal reference line; and

if there is an initial angle between the measurement line and the horizontal reference line at the initial moment, measuring the rotating angle of the measurement line with respect to the horizontal reference line, calculating an angle difference by subtracting the initial angle from the rotating angle, and determining the angle difference as the first angle between the measurement line and the horizontal reference line.

14. The non-transitory computer-readable storage medium according to claim 11, wherein the object is a first object and, when the camera images a second object, the method further comprises:

during a process in which the mobile terminal is turned to cause an edge of the second object to be parallel with the measurement line, obtaining one or more angles between the measurement line and the horizontal reference line;

determining an angle obtained when the edge of the second object is parallel with the measurement line as an angle between the second object and the horizontal plane;

calculating an angle difference by subtracting the angle between the second object and the horizontal plane from the angle between the first object and the horizontal plane; and

determining an absolute value of the angle difference as an angle between the first object and the second object.