JP2006333902A5

JP2006333902A5 -

Info

Publication number: JP2006333902A5
Application number: JP2005158726A
Authority: JP
Filing date: 2005-05-31
Publication date: 2008-07-10
Anticipated expiration: 2025-05-31

Claims

Imaging data acquisition for capturing an eyeball of a subject twice at a predetermined time interval using an imaging device, and acquiring an image obtained by the first imaging as a first image and an image obtained by the second imaging as a second image Process,
An alignment step of performing alignment so that the iris region and the pupil region in the eyeball in the first image and the second image are at the same position, and generating the aligned first image and the aligned second image When,
A difference data calculating step of calculating difference data between the aligned first image and the aligned second image ;
A foreign substance determination step of determining whether or not a foreign substance exists between the imaging device and the eyeball of the subject using the difference data;
A foreign object detection method comprising:

In the difference data calculation step , a difference between a luminance value of each pixel constituting the aligned first image and a luminance value of each pixel constituting the aligned second image is calculated and used as the difference data. The foreign matter detection method according to claim 1.

The foreign matter determining step determines that foreign matter is present when the value of the difference data is smaller than a first threshold value or larger than a second threshold value, and when the difference data is greater than or equal to the first threshold value and smaller than or equal to the second threshold value. The foreign object detection method according to claim 2, wherein it is determined that there is no foreign object.

The difference data calculating step divides the aligned first image and the aligned second image into a plurality of small areas, and calculates an average luminance value of all pixels constituting the small area for each small area. And calculates a ratio between an average luminance value of each small area constituting the aligned first image and an average luminance value of each small area constituting the aligned second image to obtain the difference data. The foreign matter detection method according to claim 1.

The foreign matter determining step determines that foreign matter is present when the value of the difference data is smaller than a first threshold value or larger than a second threshold value, and when the difference data is greater than or equal to the first threshold value and smaller than or equal to the second threshold value. 5. The foreign object detection method according to claim 4, wherein it is determined that no foreign object exists.

6. The foreign object detection according to claim 3, wherein in the foreign object determination step, the foreign object is detected only in a desired region in the aligned first image and the aligned second image. Method.

6. The foreign object according to claim 3, wherein the first threshold value and the second threshold value are set using values of the difference data obtained in iris regions located on the left and right of the pupil region. Detection method.

4. The first threshold value and the second threshold value are values obtained by applying a predetermined weight to a contrast of luminance values of the first registered image or the second registered image. And a foreign matter detection method according to claim 5.

2. The foreign object according to claim 1, wherein in the alignment step, the center position of the pupil of the first image and the second image is detected, and processing is performed so that the center position of the pupil becomes the same position. Detection method.

The foreign object detection method according to claim 1, wherein the alignment step performs alignment by matching patterns of iris regions of the first image and the second image .

Imaging means for imaging a subject's eyeball twice at predetermined time intervals, outputting an image obtained by the first imaging as a first image, and an image obtained by the second imaging as a second image ;
Detecting a foreign object by utilizing the difference data obtained from the difference of the relative positions of the foreign matter which is located between said imaging device and iris region and pupil region and the eye of the intraocular in the second image and the first image Foreign object detection means for
An observing means for observing the eyeball using the first image or the second image when it is determined by the foreign object detecting means that no foreign substance exists in the first image and the second image ; A featured eyeball observation device.

The foreign object detection means includes
Alignment means for performing the alignment so that the iris region and the pupil region in the first image and the second image are at the same position, and outputting as the aligned first image and the aligned second image ;
Difference data calculating means for calculating difference data between the aligned first image and the aligned second image ;
Foreign matter determination means for determining whether foreign matter is present from the difference data;
The eyeball observation device according to claim 11, comprising:

The difference data calculation unit calculates a difference between a luminance value of each pixel constituting the aligned first image and a luminance value of each pixel constituting the aligned second image, and sets the difference data as the difference data. The eyeball observation apparatus according to claim 12.

The foreign matter determining means determines that foreign matter is present when the value of the difference data is less than a first threshold value or greater than a second threshold value, and when the difference data value is greater than or equal to the first threshold value and less than or equal to the second threshold value. The eyeball observation device according to claim 13, wherein it is determined that no foreign matter exists.

The difference data calculating unit divides the aligned first image and the aligned second image into a plurality of small areas, and calculates an average luminance value of all pixels constituting the small area for each small area. And calculates a ratio between an average luminance value of each small area constituting the aligned first image and an average luminance value of each small area constituting the aligned second image to obtain the difference data. The eyeball observation apparatus according to claim 12.

The foreign matter determining means determines that foreign matter is present when the value of the difference data is less than a first threshold value or greater than a second threshold value, and when the difference data value is greater than or equal to the first threshold value and less than or equal to the second threshold value. The eyeball observation apparatus according to claim 15, wherein it is determined that no foreign matter exists.

17. The eyeball observation according to claim 14, wherein the foreign matter determination unit performs foreign matter determination only in a desired region of the aligned first image and the aligned second image. apparatus.

17. The eyeball according to claim 14, wherein the first threshold value and the second threshold value are set using values of the difference data obtained in an iris region located on the left and right of the pupil region. Observation device.

15. The first threshold value and the second threshold value are values obtained by applying a predetermined weight to the contrast of luminance values of the first registered image or the second registered image. And an eyeball observation apparatus according to claim 16.

The eyeball according to claim 12, wherein the alignment unit calculates a center position of the pupil of the first image and the second image , and performs processing so that the center position of the pupil becomes the same position. Observation device.

The eyeball observation apparatus according to claim 12, wherein the alignment unit performs alignment by matching patterns of iris regions of the first image and the second image .

A relative position changing means for changing the relative position on the image of the iris region and the pupil region and the foreign object by changing the line of sight of the subject;
Further comprising
The eyeball observation apparatus according to claim 11, wherein the relative position changing unit operates between the time when the imaging unit acquires the first image and the time when the second image is acquired.

The relative position changing means includes
It has a first gaze point that emits visible light and a second gaze point,
When the imaging means acquires the first image, the first gazing point is turned on and the second gazing point is turned off, and when the second image is acquired, the first gazing point is turned on. 23. The eyeball observation device according to claim 22, wherein the viewpoint is turned off and the second gazing point is turned on .

The relative position changing means includes
A gazing point that emits visible light ,
Gaze point movement means for moving the gaze point,
After obtaining the first image, the watch by the viewpoint movement unit moves the gaze point, the eye observation apparatus according to claim 22 which then obtaining the second image and said.

First imaging means for outputting an image obtained by imaging the eyeball of the subject as a first image;
A second imaging unit arranged at a position where a distance from the eyeball is equal to a distance between the first imaging unit and the eyeball, and outputting an image obtained by imaging the eyeball as a second image ;
Alignment means for performing alignment so that the iris region and the pupil region in the eyeball in the first image and the second image are at the same position, and outputting the aligned first image and the aligned second image When,
Difference data calculating means for calculating difference data between the aligned first image and the aligned second image;
Foreign matter determination means for determining whether foreign matter exists in the first image and the second image from the difference data;
An eyeball observation apparatus comprising: observation means for observing the eyeball using the first image or the second image when the foreign matter determination means determines that no foreign matter is present .

Imaging means for imaging a subject's eyeball twice at predetermined time intervals, outputting an image obtained by the first imaging as a first image, and an image obtained by the second imaging as a second image;
A moving means for moving the imaging means after the imaging means performs the first imaging and before the second imaging ;
Alignment means for performing alignment so that the iris region and the pupil region in the eyeball in the first image and the second image are at the same position, and outputting the aligned first image and the aligned second image When,
Difference data calculating means for calculating difference data between the aligned first image and the aligned second image;
Foreign matter determination means for determining whether foreign matter exists in the first image and the second image from the difference data;
An eyeball observation apparatus comprising: observation means for observing the eyeball using the first image or the second image when the foreign matter determination means determines that no foreign matter is present .