Automatic engagement of image stabilization
View Patent ↗An image stabilized digital image capture device, comprising an image sensor for capturing a digital image; an optical system for imaging a scene onto the image sensor; an image stabilization system; an exposure control system; a memory system; and a processor. The processor is used to perform the steps of determining exposure settings using the exposure control system; selectively engaging the image stabilization system responsive to whether the determined exposure settings satisfy a predefined condition; capturing a digital image of a scene using the image sensor and the selectively engaged image stabilization system; and storing the captured digital image in the memory system.
1. An image stabilized digital image capture device, comprising:
an image sensor for capturing a digital image;
an optical system for imaging a scene onto the image sensor;
an image stabilization system;
an exposure control system;
a memory system; and
a processor for performing the steps of:
determining exposure settings using the exposure control system, wherein the determined exposure setting includes an exposure time;
selectively engaging the image stabilization system responsive to whether the determined exposure settings satisfy a predefined condition, wherein the image stabilization system is not engaged when the exposure time is less than a threshold exposure time T t given by T t =K/F, where F is the focal length of the optical system and K is a predefined constant;
capturing a digital image of a scene using the image sensor and the selectively engaged image stabilization system; and
storing the captured digital image in the memory system.
2. The image stabilized digital image capture device of claim 1 wherein the power consumption of the digital image capture device and the mechanical wear of the image stabilization system is reduced when the image stabilization system is disengaged.
3. The image stabilized digital image capture device of claim 1 wherein different values of predefined constant K are used responsive to a capture mode setting.
4. The image stabilized digital image capture device of claim 1 further including an electronic flash, and wherein the determined exposure setting includes an indication of whether the electronic flash is to be fired, and wherein the image stabilization system is not engaged when the electronic flash is to be fired.
5. The image stabilized digital image capture device of claim 1 further including a means for detecting motion in the imaged scene, and wherein the selective engagement of the image stabilization is system also responsive to a detected motion in the imaged scene.
6. The image stabilized digital image capture device of claim 5 wherein the means for detecting motion in the imaged scene includes capturing a time sequence of preview images using the image sensor and detecting motion in the imaged scene by analyzing differences between the captured preview images.
7. The image stabilized digital image capture device of claim 1 wherein the image stabilized digital image capture device is a digital still camera or a digital video camera.
8. The image stabilized digital image capture device of claim 1 wherein the image stabilization system is an optical image stabilization which adjusts the position of one or more components of the optical system in response to a detected motion signal.
9. The image stabilized digital image capture device of claim 1 wherein the image stabilization system is an optical image stabilization which adjusts the position of the image sensor in response to a detected motion signal.
10. The image stabilized digital image capture device of claim 1 wherein the behavior of the image stabilization system is controlled responsive to one or more parameters, and wherein at least one of the parameters is adjusted responsive to the determined exposure setting.