Automatic alignment of an imager
Embodiments of automatically aligning imager are presented. In accordance with some embodiments, an imaging system includes an adjustment stage; an auto-alignment optics mounted on the adjustment stage and coupled to image an object, the auto-alignment optics including at least one video camera providing an image of the object; imaging scanning optics mounted on the adjustment stage and coupled to scan the object; an imager coupled to the imaging scanning optics; and a processor coupled to the adjustment stage and the auto-alignment optics, the processor executing instructions to receive the image of the object and adjust the adjustment stage to align the optics with the imaging scanning optics.
1. An imaging system, comprising:
an adjustment stage;
an auto-alignment optics mounted on the adjustment stage and coupled to image an object, the auto-alignment optics including a far camera and a near camera;
imaging scanning optics mounted on the adjustment stage and coupled to scan the object;
an imager coupled to the imaging scanning optics; and
a processor coupled to the adjustment stage and the auto-alignment optics, the processor executing instructions to:
receive a far-camera image from the far camera;
adjust the adjustment stage to center the object based on the far-camera image;
adjust the adjustment stage to position an object distance based on the far-camera image;
receive a near-camera image from the near camera;
adjust the adjustment stage to focus the near-camera image;
adjust the adjustment stage to center the object based on the near-camera image; and
align the auto-alignment optics with the imaging scanning optics.
2. The imaging system of claim 1 , wherein the auto-alignment optics include a non-telecentric optical path between the far camera and the object and a telecentric optical path between the near camera and the object.
3. The imaging system of claim 2 , wherein the near camera includes a large numerical aperture and the far camera includes a low numerical aperture.
4. The imaging system of claim 1 , wherein the processor executes further instructions to:
adjust the imager relative to the object; and
capture an image from the imager.
5. The imaging system of claim 4 , wherein the imager is an OCT imager and instructions to adjust the imager include adjusting a position of a reference mirror in a reference arm to obtain an OCT image.
6. The imaging system of claim 5 , wherein instructions to adjust the imager further include adjusting polarization to maximize an OCT signal.
7. The imaging system of claim 5 , wherein instructions to adjust the imager further include adjusting a tilt of the OCT image relative to the object.
8. The imaging system of claim 5 , wherein the image scanning optics include fiber collimator lens and wherein the processor further executes instructions to adjust the fiber collimator lens to focus an OCT signal.
9. The imaging system of claim 1 , wherein adjusting the adjustment stage to center the object includes determining a feature of the object and adjusting the adjustment stage to position the feature.
10. The imaging system of claim 9 , wherein the feature is a pupil of an eye.
11. A method of aligning an imaging system, comprising:
receiving, by a processor, a far-camera image of an object from a far camera, the far camera coupled through a first set of optics to the object;
centering the object by adjusting a stage on which the far camera and the first set of optics are mounted relative to the object based on a feature detected in the far-camera image by the processor;
adjusting the stage to position an object distance based on the far-camera image;
receiving, by the processor, a near-camera image of the object from a near camera, the near camera coupled through a second set of optics to the object;
adjusting the stage to focus the near-camera image; and
adjusting the stage to center the object based on the near-camera image.
12. The method of claim 11 , wherein the first set of optics are non-telecentric and the second set of optics are telecentric.
13. The method of claim 11 , wherein adjusting the stage to position an object distance based on the far-camera image includes moving the stage closer to the object until the object has reached a predetermined size in the far-camera image.
14. The method of claim 13 , further comprising:
adjusting an imager relative to the object, the imager coupled to imaging scanning optics, the image scanning optics mounted on the stage and coupled to scan the object; and
capturing an image from the imager.
15. The method of claim 14 , wherein the imager is an OCT imager and adjusting the imager includes adjusting a position of a reference mirror in a reference arm to obtain an OCT image.
16. The method of claim 15 , wherein adjusting the imager includes adjusting polarization to maximize an OCT signal.
17. The method of claim 15 , wherein adjusting the imager includes adjusting a tilt of the OCT image relative to the object.
18. The method of claim 14 , centering the object by adjusting a stage includes determining a feature of the object and adjusting the stage to position the feature.
19. The method of claim 18 , wherein the feature is a pupil of an eye.