Zoom related methods and apparatus
Methods and apparatus for performing zoom in and zoom out operations are described using multiple optical chains in a camera device. At least one optical chain in the camera device includes a moveable light redirection device, said light redirection device being one of a substantially plane mirror or a prism. Different zoom focal length settings correspond to different scene capture areas for the optical chain with the moveable light redirection device. Overlap between scene areas captured by different optical chains increases during zoom in and decreases during zoom out. Images captured by different optical chains are combined and/or cropped to generate a composite image corresponding to a zoom focal length setting.
1. A method of capturing images, the method comprising:
implementing a zoom in operation in response to user control, said zoom in operation including adjusting a direction of a first light redirection device of a first optical chain of a camera device, said first light redirection device being one of a substantially plane mirror or a prism, said adjusting increasing an overlap in scene areas captured by the first optical chain of said camera device and a second optical chain of said camera device and adjusting a direction of a second light redirection device of said second optical chain, said second light redirection device being a second mirror or a second prism, said adjusting of said second light redirection device increasing the overlap in scene areas captured by the first and second optical chain;
wherein said first and second optical chains have the same focal length f1, and wherein said zoom in operation corresponds to a zoom focal length setting in the range of f2 to f1, said range including f2 and f1,
capturing an image of a scene area using the first optical chain;
capturing an image of the scene area using the second optical chain;
capturing an image of the scene area using a third optical chain of said camera having a focal length f2, where f2 is smaller than f1; and
generating a composite image, in accordance with a zoom focal length setting, from images captured by said first, second and third optical chains, wherein generating the composite image includes performing a crop operation on the image captured by the third optical chain when said zoom focal length setting is greater than f2.
2. The method of claim 1 further comprising:
implementing a zoom out operation in response to user control, said zoom out operation including adjusting the direction of the first light redirection device and the direction of the second light redirection device, said adjusting decreasing an overlap in scene areas captured by the first and second optical chains.
3. A method of capturing images, the method comprising:
implementing a zoom in operation in response to user control, said zoom in operation including adjusting a direction of a first light redirection device of a first optical chain of a camera device, said first light redirection device being one of a substantially plane mirror or a prism, said adjusting increasing an overlap in scene areas captured by the first optical chain of said camera device and a second optical chain of said camera device, said first and second optical chains having the same focal length f1;
capturing an image of the scene area using a third optical chain of said camera having a focal length f2, where f2 is smaller than f1; and
wherein the third optical chain has an optical axis which is perpendicular to the face of the optical chain and which remains fixed irrespective of a zoom setting.
4. The method of claim 2 , wherein said zoom out operation corresponds to a zoom focal length setting in the range of f2 to f1, said range including f2 and f1.
5. A camera device comprising:
a zoom in light redirection device positioning adjustment control module configured to implement a zoom in operation in response to user control, said zoom in operation including adjusting a direction of a first light redirection device of a first optical chain of a camera device, said first light redirection device being one of a substantially plane mirror or a prism, said adjusting increasing an overlap in scene areas captured by the first optical chain of said camera device and a second optical chain of said camera device, said zoom in light redirection device positioning control module being further configured to adjust a direction of a second light redirection device of said second optical chain, said second light redirection device being a second mirror or a second prism, said adjusting of a second light redirection device increasing the overlap in scene areas captured by the first and second optical chains, as part of implementing a zoom in operation, said first and second optical chains having the same focal length f1, and said zoom in operation corresponding to a zoom focal length setting in the range of f2 to f1, said range including f2 and f1;
an image capture control module configured to control the first optical chain to capture an image of a scene area and control the second optical chain to capture an image of a scene area and being further configured to control a third optical chain of said camera to capture an image of the scene area, said third optical chain of said camera having a focal length f2, where f2 is smaller than f1; and
a composite image generation module configured to generate a composite image, in accordance with a zoom focal length setting, from images captured by said first, second, and third optical chains, wherein generating a composite image includes performing a crop operation on the image captured by the third optical chain when said zoom focal length setting is greater than f2.
6. The camera device of claim 5 further comprising:
a zoom out light redirection device positioning adjustment control module configured to implement a zoom out operation in response to user control, said zoom out operation including adjusting the direction of the first light redirection device and the direction of the second light redirection device, said adjusting decreasing an overlap in scene areas captured by the first and second optical chains.
7. A camera device comprising:
a zoom in light redirection device positioning adjustment control module configured to implement a zoom in operation in response to user control, said zoom in operation including adjusting a direction of a first light redirection device of a first optical chain of a camera device, said first light redirection device being one of a substantially plane mirror or a prism, said adjusting increasing an overlap in scene areas captured by the first optical chain of said camera device and a second optical chain of said camera device, said first and second optical chains having the same focal length f1;
an image capture control module configured to control a third optical chain of said camera to capture an image of the scene area, said third optical chain of said camera having a focal length f2, where f2 is smaller than f1; and
wherein the third optical chain has an optical axis which is perpendicular to the face of the optical chain and which remains fixed irrespective of a zoom setting.
8. The camera device of claim 6 , wherein said zoom out operation corresponds to a zoom focal length setting in the range of f2 to f1, said range including f2 and f1.
9. A non-transitory machine readable medium having processor executable instructions stored thereon which when executed by the processor of a camera device control the camera device to:
implement a zoom in operation in response to user control, said zoom in operation including adjusting a direction of a first light redirection device of a first optical chain of a camera device, said first light redirection device being one of a substantially plane mirror or a prism, said adjusting increasing an overlap in scene areas captured by the first optical chain of said camera device and a second optical chain of said camera device, implementing the zoom in operation further including adjusting a direction of a second light redirection device of said second optical chain, said second light redirection device being a second mirror or a second prism, said adjusting of said second light redirection device increasing the overlap in scene areas captured by the first and second optical chain, wherein said first and second optical chains have the same focal length, and wherein said zoom in operation corresponds to a zoom focal length setting in the range of f2 to f1, said range including f2 and f1,
capture an image of a scene area using the first optical chain;
capture an image of a scene area using the second optical chain;
capture an image of the scene area using a third optical chain of said camera having a focal length f2, where f2 is smaller than f1; and
generate a composite image, in accordance with a zoom focal length setting, from images captured by said first, second and third optical chains, wherein generating the composite image includes performing a crop operation on the image captured by the third optical chain when said zoom focal length setting is greater than f2.