Systems and methods of exposure restart for cameras

• US 20070097221A1
• Filed: 10/28/2005
• Published: 05/03/2007
• Est. Priority Date: 10/28/2005
• Status: Abandoned Application

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Hofer, Gregory, Campbell, David, Stavely, Donald, Goris, Andrew
• Application Number:
  US11/261,248
• Publication Number:
  US 20070097221A1
• Time in Patent Office: Days
• US Class Current: 348/208.11
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6811 based on the image signal
• CPC Class Codes: H04N 23/6812 based on additional sensors, e.g. acceleration sensors
• CPC Class Codes: H04N 23/6815 by distinguishing pan or tilt from motion
• CPC Class Codes: H04N 23/684 performed by controlling the image sensor readout, e.g. by controlling the integration time

Abstract

Systems and methods for implementing exposure restart in cameras are disclosed. In an exemplary embodiment the method may comprise starting image exposure in response to user input to photograph a scene. The method may also comprise characterizing camera shake based at least in part on motion of the camera. The method may also comprise restarting the image exposure based at least in part on the characterized camera shake.

Claims

1. An exposure restart system for a camera, comprising:

an image sensor operable to capture an image of a scene being photographed; and

exposure timing logic for characterizing camera shake based at least in part on motion data for the camera, the exposure timing logic restarting exposure of the image by the image sensor based at least in part on the characterized camera shake.

2. The system of claim 1 further comprising a motion detection subsystem inputting the motion data to the exposure timing logic.

3. The system of claim 2 wherein the motion detection subsystem includes a motion sensor for measuring motion data for the camera, and motion detection logic for inputting the motion data to the exposure timing logic.

4. The system of claim 1 further comprising an image capture controller, the image capture controller starting exposure of the image at the image sensor when a user depresses a shutter button.

5. The system of claim 4 wherein the image capture controller restarts exposure of the image based on a restart signal from the exposure timing logic.

6. The system of claim 1 wherein the exposure timing logic characterizes camera shake based at least in part on camera settings.

7. The system of claim 1 wherein the exposure timing logic characterizes camera shake based at least in part on the scene being photographed.

8. The system of claim 1 wherein the exposure timing logic characterizes camera shake based at least in part on historical data.

9. The system of claim 1 wherein exposure of the image is shorter on restart than an original exposure time.

10. The system of claim 1 wherein exposure of the image is not restarted after a time-out.

11. A method of exposure restart for a camera, comprising:

starting image exposure in response to user input to photograph a scene;

characterizing camera shake based at least in part on motion of the camera; and

restarting the image exposure based at least in part on the characterized camera shake.

12. The method of claim 11 wherein characterizing camera shake is based at least in part on at least one of the following:

camera settings, the scene being photographed, user data, predictive data, and historical data.

13. The method of claim 11 wherein restarting the image exposure is only prior to a time-out.

14. The method of claim 11 wherein restarting the image exposure is only if camera shake is improving.

15. The method of claim 11 wherein restarting the image exposure is only if camera shake is predicted to improve.

16. The method of claim 11 wherein restarting the image exposure is for a shorter duration.

17. The method of claim 11 wherein characterizing the camera shake is adaptive.

18. The method of claim 11 further comprising clearing the image exposure before restarting the image exposure.

19. The method of claim 11 wherein restarting the image exposure is automatically deactivated if camera motion is expected.

20. A system for restarting exposure in a camera, comprising:

means for starting image exposure of a scene;

means for characterizing camera motion; and

means for restarting image exposure of the scene based at least in part on the camera motion.

21. The system of claim 20 further comprising means for timing the image exposure and deactivating the means for restarting image exposure after a time-out.

22. The system of claim 20 further comprising means for deactivating the means for restarting image exposure if a type of camera motion being characterized is expected.