Photographing direction deviation detection method, apparatus, device, and storage medium

Patent metadata

Field	Value
Publication number	US-10893209-B2
Application number	US-201916412576-A
Country	US
Kind code	B2
Filing date	May 15, 2019
Priority date	Feb 16, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A photographing direction deviation detection method is provided for a deviation detection device. The method includes obtaining a horizontal acceleration of an image capturing device at each of a plurality of time points in a pre-determined time period, and determining a target photographing direction of the image capturing device according to the horizontal acceleration at each of the time points. The method also includes, when a direction angle satisfies a preset condition, determining that an actual photographing direction of the image capturing device deviates, where the direction angle is an angle between the target photographing direction and the actual photographing direction of the image capturing device at an end time point of the pre-determined time period.

First claim

What is claimed is:

1. A photographing direction deviation detection method, comprising:
obtaining, by a deviation detection device, a horizontal acceleration of an image capturing device at each of a plurality of time points in a pre-determined time period;
calculating, by the deviation detection device, a horizontal moving speed of the image capturing device at each of the plurality of time points according to the horizontal acceleration;
setting, by the deviation detection device, a weight for the horizontal moving speed at each of the plurality of time points;
obtaining, by the deviation detection device, an aggregated horizontal moving speed of the pre-determined time period according to the horizontal moving speed and the weight for the horizontal moving speed at each of the plurality of time points;
determining, by the deviation detection device, a target photographing direction of the image capturing device according to the aggregated horizontal moving speed
calculating a direction angle between the target photographing direction and an actual photographic direction of the image capturing device; and
when the direction angle satisfies a preset condition, determining, by the deviation detection device, that the actual photographing direction of the image capturing device deviates.

2. The method according to claim 1 , wherein the image capturing device is fixedly disposed in a vehicle, and the determining, by the deviation detection device, the target photographing direction of the image capturing device according to the horizontal acceleration at each of the time points comprises:
obtaining, by the deviation detection device, an initial moving speed of the image capturing device, the initial moving speed being a moving speed of the image capturing device in a horizontal direction at a start time point of the pre-determined time period;
calculating, by the deviation detection device, the horizontal moving speed of the image capturing device at each of the plurality of time points according to the initial moving speed of the image capturing device and the horizontal acceleration at each of the plurality of time points;
determining, by the deviation detection device, a horizontal straight-forward direction of the vehicle according to the horizontal moving speed of the image capturing device at each of the plurality of time points; and
determining, by the deviation detection device, the target photographing direction of the image capturing device according to the horizontal straight-forward direction of the vehicle and a pre-determined relationship between the horizontal straight-forward direction and the target photographing direction.

3. The method according to claim 2 , wherein the determining, by the deviation detection device, the horizontal straight-forward direction of the vehicle according to the horizontal moving speed of the image capturing device at each of the plurality of time points comprises:
determining, by the deviation detection device, a direction of the aggregated horizontal moving speed as the horizontal straight-forward direction of the vehicle.

4. The method according to claim 2 , wherein the determining, by the deviation detection device, the horizontal straight-forward direction of the vehicle according to the horizontal moving speed of the image capturing device at each of the time points comprises:
determining, by the deviation detection device, one or more valid time points among the plurality of time points, the one or more valid time points each being a time point at which a corresponding horizontal moving speed has a speed value greater than a preset speed threshold;
obtaining, by the deviation detection device, the aggregated horizontal moving speed further according to the corresponding horizontal moving speed at each of the one or more valid time points; and
determining, by the deviation detection device, a direction of the aggregated horizontal moving speed as the horizontal straight-forward direction of the vehicle.

5. The method according to claim 2 , wherein the pre-determined relationship comprises an angle between the horizontal straight-forward direction and the target photographing direction, and the method further comprises:
updating, by the deviation detection device, the angle between the horizontal straight-forward direction and the target photographing direction comprised in the pre-determined relationship to the direction angle when receiving an instruction for resetting the pre-determined relationship.

6. The method according to claim 1 , wherein, after the deviation detection device determines that the actual photographing direction of the image capturing device deviates, the method further comprises:
sending, by the deviation detection device, a prompt message to a user terminal, the prompt message being used for indicating that the actual photographing direction of the image capturing device deviates.

7. The method according to claim 1 , wherein after the deviation detection device determines that the actual photographing direction of the image capturing device deviates, the method further comprises:
correcting, by the deviation detection device, the actual photographing direction of the image capturing device according to the direction angle.

8. The method according to claim 1 , wherein the preset condition comprises at least one of the following conditions:
the direction angle is greater than a first preset angle threshold;
a component of the direction angle in a horizontal plane is greater than a second preset angle threshold; and
a component of the direction angle in a vertical plane is greater than a third preset angle threshold.

9. The method according to claim 1 , wherein the horizontal moving speed includes a first speed and a second speed greater in value than the first speed, and wherein the weight includes a first weight corresponding to the first speed and a second weight corresponding to the second speed, the second weight being greater in value than the first weight.

10. A photographing direction deviation detection apparatus, comprising: an image capturing device for capturing images in an actual photographing direction; and a deviation detection device for determining whether the actual photographing direction deviates from a target photographing direction, wherein the deviation detection device is configured to perform:
obtaining a horizontal acceleration of an image capturing device at each of a plurality of time points in a pre-determined time period;
calculating a horizontal moving speed of the image capturing device at each of the plurality of time points according to the horizontal acceleration;
setting a weight for the horizontal moving speed at each of the plurality of time points;
obtaining an aggregated horizontal moving speed of the pre-determined time period according to the horizontal moving speed and the weight for the horizontal moving speed at each of the plurality of time points;
determining a target photographing direction of the image capturing device according to the aggregated horizontal moving speed
calculating a direction angle between the target photographing direction and an actual photographic direction of the image capturing device; and
when the direction angle satisfies a preset condition, determining that the actual photographing direction of the image capturing device deviates.

11. The apparatus according to claim 10 , wherein the image capturing device is fixedly disposed in a vehicle, and the determining the target photographing direction of the image capturing device according to the horizontal acceleration at each of the time points comprises:
obtaining an initi

Assignees

• Tencent Tech Shenzhen Co Ltd

Inventors

• Wang Dafeng
• Chen Jianye

Classifications

• H04N23/695 Primary

  Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects · CPC title

• H04N7/188 Primary

  Capturing isolated or intermittent images triggered by the occurrence of a predetermined event, e.g. an object reaching a predetermined position (signal generation from motion picture films H04N5/253) · CPC title

• G07C5/08 Primary

  Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time · CPC title

• G01P15/00

  Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration · CPC title

• G01C15/00

  Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00 · CPC title