METHOD AND SYSTEM FOR TESTING AN IMAGE STABILIZING DEVICE FOR AN IMAGE CAPTURE APPARATUS

• US 20110181741A1
• Filed: 01/27/2011
• Published: 07/28/2011
• Est. Priority Date: 01/28/2010
• Status: Active Grant

• Current Assignee: STMicroelectronics SAS (STMicroelectronics NV)
• Original Assignee: STMicroelectronics SAS (STMicroelectronics NV)
• Inventors: Luneau, Dominique, Serve, Rémi, Varillon, Paul
• Granted Patent: US 8,670,039 B2
• Time in Patent Office: Days
• US Class Current: 348/208.4
• CPC Class Codes: G01M 7/022 Vibration control arrangements, e.g. for generating random vibrations
• CPC Class Codes: G01M 7/025 Measuring arrangements
• CPC Class Codes: G01M 7/06 Multidirectional test stands
• CPC Class Codes: G02B 27/646 compensating for small deviations, e.g. due to vibration or shake movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68
• CPC Class Codes: H04N 17/002 for television cameras
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations

Abstract

The disclosure relates to a test process of an image stabilization system in an image capture apparatus, comprising steps of: submitting the stabilization system to rotation vibratory movements around two distinct rotation axes, measuring characteristics of rotation vibratory movements, and setting the rotation vibratory movements to setpoint position values and, taking into consideration the measured characteristics of the vibratory movements, collecting images from the image capture apparatus submitted to vibration and analyzing the collected images.

Claims

1. A test process for testing a stabilization system for compensating human trembling movements, comprising:

submitting the stabilization system to rotation vibratory movements around two distinct rotation axes;

measuring characteristics of the rotation vibratory movements; and

slaving the rotation vibratory movements of the stabilization system to setpoint position values based on the measured characteristics of the rotation vibratory movements.

2. A process according to claim 1, comprising:

submitting the stabilization system to translation vibratory movement along a translation axis substantially perpendicular to one of the two rotation axes;

measuring characteristics of the translation vibratory movement applied to the stabilization system; and

slaving the translation vibratory movement of the stabilization system to setpoint position values based on the measured characteristics of the translation vibratory movement.

3. A process according to claim 2, wherein the measured characteristics of the translation vibratory movement comprise instantaneous linear positions and accelerations.

4. A process according to claim 1, wherein the rotation vibratory movement around a rotation axis is applied to the stabilization system in a manner independent of other vibratory movements applied to the stabilization system.

5. A process according to claim 1, wherein the measured characteristics of rotation vibratory movements comprise instantaneous angular positions and angular speeds around the rotation axes.

6. A process according to claim 1, wherein the submitting includes applying commands to actuators and generating the rotation vibratory movements by the actuators in response to the commands, wherein the measuring and applying are performed at a rate of 100 to 200 times a rate at which the setpoint position values are supplied.

7. A process according to claim 1, comprising a comparing measured position values and setpoint position values.

8. A process according to claim 1, wherein the stabilization system is equipped with an image capture apparatus and the rotation vibratory movements are applied to the image capture apparatus, the process comprising collecting images from the image capture apparatus submitted to rotation vibratory movements, and determining performances of the stabilization system by analyzing the collected images.

9. A process according to claim 1, comprising

measuring characteristics of rotation vibratory movements around the two distinct rotation axes of an object held by a human,

determining successive positions of the object around the rotation axes as a function of the measured characteristics of the object, and

storing the determined successive positions.

10. A process according to claim 1, comprising:

measuring characteristics of a translation vibratory movement of an object, held by a human, along a translation axis parallel to one of the two rotation axes;

determining successive positions along the translation axis as a function of the measured movements; and

storing the determined successive positions.

11. A process according to claim 10, comprising supplying stored successive positions as the setpoint position values.

12. A process according to claim 1, comprising determining the setpoint position values as a function of amplitude and frequency values of one or more combined vibratory movements.

13. A test device for testing a stabilization system configured to compensate for human trembling movements, comprising:

a plurality of actuators configured to submit the stabilization system to rotation vibratory movements around two distinct rotation axes;

a measuring system configured to measure characteristics of the rotation vibratory movements; and

a controller configured to slave the rotation vibratory movements of the stabilization system to setpoint position values based on the measured characteristics of the rotation vibratory movements.

14. A device according to claim 13, wherein the actuators are voice coil actuators.

15. A device according to claim 13, wherein the measuring system includes linear potentiometers configured to measure a position of a support of the stabilization system around the rotation axes, and gyrometers configured to measure instantaneous angular speeds of the stabilization system around the rotation axes.

16. A device according to claim 13, comprising:

a fixed first support,

a second support rotatably coupled to the first support,

a third support rotatably coupled to the second support and configured to receive an image capture apparatus, the second support being configured to slide laterally with respect to the first support.

17. A device according to claim 13, comprising:

an image capture apparatus;

a fixed first support,

a second support rotatably coupled to the first support,

a third support rotatably coupled to the second support and configured to receive the image capture apparatus.

18. A system, comprising:

an image capture apparatus holder configured to hold an image capture apparatus;

a plurality of actuators configured to submit the image capture apparatus holder to rotation vibratory movements around two distinct rotation axes;

a measuring system configured to measure characteristics of the rotation vibratory movements; and

a controller configured to slave the rotation vibratory movements of the stabilization system to setpoint position values based on the measured characteristics of the rotation vibratory movements.

19. A system according to claim 18, wherein the measuring system includes linear potentiometers configured to measure a position of a support of the stabilization system around the rotation axes, and gyrometers configured to measure instantaneous angular speeds of the stabilization system around the rotation axes.

20. A device according to claim 18, comprising:

a fixed first support,

a second support rotatably coupled to the first support,

a third support rotatably coupled to the second support and including the image capture apparatus holder.