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1. EP2737278 - MEASURING DEVICE THAT CAN BE OPERATED WITHOUT CONTACT AND CONTROL METHOD FOR SUCH A MEASURING DEVICE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Claims

1. Geodetic measuring appliance (1), in particular theodolite or total station, for determining the position of a target point, comprising

• a targeting device (5), in particular telescope, wherein the targeting device (5) is pivotable in a motorized manner relative to a base (11) of the measuring appliance (1) for the purpose of changing the alignment of said targeting device and has at least one objective unit (21) that defines an optical target axis (6),

• angle measuring functionality for high-precision acquisition of the alignment of the target axis (6), and

• evaluation means for data storage and control of the alignment of the targeting device (5),
characterized by
an eye image acquisition device (4, 4'), which is designed to acquire eye images of an eye (3) of a user,
and in that the evaluation means are designed for implementing an automatic viewing-direction-dependent targeting functionality in such a way that the following take place automatically after the function has started:

• at least one eye image is recorded,

• a viewing direction of the user's eye (3) or of eye information suitable for deriving a viewing direction of the user's eye (3) is determined by means of image processing on the basis of the at least one eye image, and

• the alignment of the targeting device (5) is changed in a motorized manner depending on the viewing direction of the user's eye (3) or depending on the eye information.


  2. Geodetic measuring appliance (1) according to Claim 1,
characterized in that
the eye image acquisition device (4, 4') is fitted in or on the targeting device (5) and in particular is designed to acquire eye images of a user's eye (3) situated at a user end of the targeting device (5) and/or comprises at least one camera suitable

• for acquiring eye images continuously, in particular at least three eye images per second, or

• for acquiring individual eye images.


  3. Geodetic measuring appliance (1) according to Claim 1 or Claim 2,
characterized in that
the eye information comprises at least:

• a position of the pupil (P), of the pupil midpoint or of the iris in the eye image;

• a distribution of bright and dark areas in the eye image;

• a distance between the pupil (P), the pupil midpoint or the iris and the target axis (6);

• a direction from the target axis (6) to the pupil (P), to the pupil midpoint or to the iris;

• a diameter of the eyeball of the user's eye (3) ;

• a distance between the eyeball midpoint (M) and the target axis (6); or

• an angle (α) between the target axis (6) and the viewing direction.


  4. Geodetic measuring appliance (1) according to any one of the preceding claims,
characterized in that
the alignment of the targeting device (5) is variable on the basis of the viewing direction of the user's eye (3) or the eye information in such a way that the target axis (6) of the targeting device (5) and the viewing direction of the user's eye (3) coincide.
  5. Geodetic measuring appliance (1) according to any one of the preceding claims,
characterized in that
an alignment aid (26), in particular a reticle, is provided on the targeting device (5), and the alignment of the targeting device (5) is variable on the basis of the viewing direction of the user's eye (3) or the eye information in such a way that the viewing direction of the user's eye (3) is directed through the midpoint of the alignment aid (26).
  6. Geodetic measuring appliance (1) according to either of Claims 4 and 5,
characterized in that
a variation speed of the alignment of the targeting device (5) or of the reticle (7) is dependent on the viewing direction of the user's eye (3) or on the eye information.
  7. Geodetic measuring appliance (1) according to any one of the preceding claims,
characterized in that
the targeting device (5) has a camera sensor (22) for acquiring a camera image (2) of the sighted target mark, and the measuring appliance (1) has means for representing said camera image (2).
  8. Geodetic measuring appliance (1) according to any one of the preceding claims,
characterized in that
the eye image acquisition device (4, 4') for acquiring eye images

• is equipped with an illumination device designed to illuminate the user's eye (3), in particular with infrared light;

• comprises light-sensitive sensors, in particular CCD or CMOS image sensors; and/or

• is designed to create a surface profile of the eye (3), in particular by means of a scanner.


  9. Method for controlling a targeting device (5) of a geodetic measuring appliance (1), in particular of a theodolite or of a total station,
characterized in that
eye images of a user's eye (3) are acquired, wherein the following take place automatically after the function has started:

• at least one eye image is recorded,

• a viewing direction of the user's eye (3) or of eye information suitable for deriving a viewing direction of the user's eye (3) is determined by means of image processing on the basis of the at least one eye image, and

• the alignment of the targeting device (5) is changed in a motorized manner depending on the viewing direction of the user's eye (3) or depending on the eye information.


  10. Method according to Claim 9,
characterized in that
the eye information comprises at least:

• a position of the pupil (P), of the pupil midpoint or of the iris in the eye image; or

• a distribution of bright and dark areas in the eye image; or

• a distance between the pupil (P), the pupil midpoint or the iris and the target axis (6); or

• a direction from the target axis (6) to the pupil (P), to the pupil midpoint or to the iris; or

• a diameter of the eyeball of the user's eye (3) ;

• a distance between the eyeball midpoint (M) and the target axis (6); or

• an angle (α) between the target axis (6) and the viewing direction.


  11. Method according to Claim 9 or Claim 10,
characterized in that
evaluation means are provided on the measuring appliance (1) and acquire a control signal if

• the viewing direction of the user's eye (3) or the eye information cannot be determined in a predetermined number of eye images acquired in direct succession, in particular on account of blinking by the user;

• a closed user's eye (3) is determined in a predetermined number of eye images acquired in direct succession; and/or

• the eye image acquisition device (4, 4') determines a movement or combination of movements of the viewing direction of the user's eye (3), said movement being defined beforehand, in particular by the user, or derives it on the basis of the eye information.


  12. Method according to any one of Claims 9 to 11,
characterized in that
the representation of the target can be superimposed or can be replaced by representations of control commands, and evaluation means of the measuring appliance (1) select one of the represented control commands on the basis of the viewing direction of the user's eye (3) or the eye information.
  13. Method according to any one of Claims 9 to 12,
characterized by
a target point identification device identifies and marks possible target points (8) lying near the viewing direction in the representation of the sighted target and/or stores them as target point in a storage device in response to a control signal being output.
  14. Method according to any one of Claims 9 to 13,
characterized in that
the representation of the sighted target is subdivided into virtual sectors (18) by means of a virtual line grid (9) placed around an anchor display point, said grid being formed by concentric circular lines (19) around the anchor display point and radial lines (17) which proceed from the anchor display point and intersect said circular lines (19), wherein the sectors (18) correspond to digitized values for an alignment change direction and an alignment change speed, and the alignment of the targeting device (5) is changed with the alignment change direction and alignment change speed assigned to the respective sector for as long as one of the display points lying within said sector is marked, and the alignment change direction and alignment change speed are correspondingly changed as soon as a display point lying within a different sector is marked, namely to the alignment change direction and respectively alignment speed corresponding to the different sector.
  15. Computer program product comprising program code, stored on a machine-readable carrier, for carrying out the method according to any one of Claims 9 to 14, in particular if the program is executed on an electronic data processing unit embodied as evaluation means of the measuring appliance (1) according to any one of Claims 1 to 8.