Method and apparatus for image-based eye tracking for retinal diagnostic or surgery device
a retinal diagnostic or surgery device and image-based technology, applied in the field of image-based eye tracking for retinal diagnostic or surgery devices, can solve the problems of insufficient accuracy of image processing techniques used for eye tracking, poor image quality of system, and poor overall accuracy of conventional eye tracking methods, so as to improve the overall accuracy of eye tracking methods, reduce the influence of scanning beams, and enhance performan
Inactive Publication Date: 2014-11-13
SENSOMOTORIC INSTR FUR INNOVATIVE SENSORIK MBH D B A SENSOMOTORIC INSTR +1
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AI Technical Summary
Benefits of technology
Enhances the accuracy and performance of eye tracking systems, enabling reliable tracking in real-time despite disturbed images, and improves the quality of video streams by compensating for illumination variations and saturation effects.
Problems solved by technology
However, conventional eye tracking techniques suffer from several problems.
If the SNR is low, then the image processing techniques used for eye tracking are not as accurate as they could be.
Moreover, there are problems which are due to the specific instrumentational configuration.
In case of an OCT system, the measurement beam of the OCT interferes with the fundus imaging due to fact that the illumination spectrum of the beam is close to the imaging spectrum (near IR).
Additionally image is corrupted by acquisition noise and by illumination distortions caused by the pupil size and alignment changes during the procedure. can be applied to any device in which either a measurement scanning beam or surgical laser beam effects the retinal image used for tracking or alignment.
Method used
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[0051]A first embodiment of the present invention will now be described in connection with FIG. 1. A camera (e.g. a CCD camera) 110 takes video images of an eye 100, and the images are fed to a computer 120. Such an arrangement is equal to a classical eye tracking system and it may also be applied to the present invention. In the conventional eye tracking system, based on the images captured the computer 120“tracks” the eye movement, e.g. by comparing the position of some “landmarks” in the momentary image with the position in the previous image to thereby “track” the movement of the eye. Based on the tracked actual position a feedback signal may be determined which then is used to carry out a position compensation at a surgical or diagnostic device (not shown in FIG. 1).
[0052]In order to track the movement of the eye or to determine the position of the eye an instantaneous image of the eye is compared with some reference image. According the present embodiment this reference image ...
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An eye tracking method for determining a position of an eye or a part of an eye in an image of an image sequence by performing a comparison between said image and a reference image, said process including:aligning a set of images;computing an enhanced reference image based on a combination of said set of aligned images; anddetermining said position in said image of said image sequence by comparing said image of said image sequence and said enhanced reference image to yield a motion estimation between said reference image and said image of said sequence.
Description
CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims benefit of U.S. patent application Ser. No. 11 / 142,962, filed Jun. 1, 2005, entitled METHOD AND APPARATUS FOR IMAGE-BASED EYE TRACKING FOR RETINAL DIAGNOSTIC OR SURGERY DEVICE, which claims benefit of European Patent application 04013015.5, filed Jun. 2, 2004, which are incorporated by reference herein.FIELD OF THE INVENTION[0002]The present invention relates to a method and an apparatus used in image-based tracking of eye movement or position in a retinal diagnostic / surgical device.BACKGROUND OF THE INVENTION[0003]Image-based tracking of eye movement or position is known to be used for several applications such as surgery and diagnostics, one example being a retinal diagnostic / surgical device. However, conventional eye tracking techniques suffer from several problems. One problem is the image quality provided by the system, e.g. the signal-to-noise ratio SNR. If the SNR is low, then the image processing techniques...
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IPC IPC(8): A61B3/10G06T7/00G06K9/00A61B3/113A61B3/14A61F9/008A61F9/01
CPCA61B3/102A61B3/113A61B3/145G06K9/0061G06T7/0016G06T2207/10101G06T2207/10016G06T2207/30041A61F9/008A61F2009/00846A61F2009/00872G06T7/0012G06V40/193
InventorTEIWES, WINFRIEDGRECU, HORIA
OwnerSENSOMOTORIC INSTR FUR INNOVATIVE SENSORIK MBH D B A SENSOMOTORIC INSTR