Surgical microscope

1. A surgical microscope comprising:

microscopy optics;

a camera;

a display system; and

a controller;

wherein the microscopy optics are configured to image a field of view onto the camera;

wherein the camera is configured to obtain two-dimensional camera images of the field of view and to generate image data representing the camera images;

wherein the microscopy optics are variable optics configured to change an imaging scale of the imaging of the field of view onto the camera;

wherein the controller comprises a data memory storing object data of each member of a group of plural different surgical tools;

wherein the controller is configured to:

receive the image data from the camera and to process the camera images represented by the image data;

determine an expected size of a surgical tool in the camera images based on the object data of the members of the group of plural different surgical tools and the imaging scale; and

use the determined expected size of the surgical tool to identify the surgical tool in the camera images by object recognition, the object recognition including:

limiting a search space of the object recognition by using the determined expected size of the surgical tool in the camera images;

using the object data of the members of the group of plural different surgical tools and the imaging scale; and

within the limited search space, selecting, from the members of the group of plural different surgical tools, a member corresponding to the surgical tool in the camera images.

2. The surgical microscope according to claim 1 , wherein the identifying of the surgical tool in the camera images by object recognition comprises generating data representing at least one of: an identifier used for the surgical tool, a position of the surgical tool in the field of view, and an orientation of the surgical tool in the field of view.

3. The surgical microscope according to claim 1 , wherein the controller triggers a measure based on the surgical tool.

4. The surgical microscope according to claim 3 , wherein the measure comprises one of: performing an OCT measurement, and changing an information displayed by the display system.

5. The surgical microscope according to claim 1 , wherein the display system comprises a display for displaying an image, wherein the controller generates data representing the displayed image based on the camera image.

6. The surgical microscope according to claim 5 , wherein the display system comprises an ocular of the microscopy optics, and wherein the microscopy optics are configured to project the image displayed by the display into a beam path of the ocular.

7. The surgical microscope according to claim 1 , wherein the microscopy optics comprise at least one sensor configured to measure the imaging scale and to transmit data representing the measured imaging scale to the controller; and

wherein the controller is configured to obtain the imaging scale of the imaging from the data representing the measured imaging scale.

8. The surgical microscope according to claim 1 , wherein the controller comprises a user interface configured to receive data representing a magnification of the imaging desired by a user,

wherein the microscopy optics comprise an actuator for changing the imaging scale, wherein the actuator is controlled by the controller, and

wherein the controller is configured to control the actuator in dependence of the data representing the desired magnification.

9. The surgical microscope according to claim 8 , wherein the controller is configured to obtain the imaging scale from the data representing the desired magnification.

10. The surgical microscope according to claim 1 , wherein the microscopy optics comprise an objective lens having at least two components being displaceable relative to each other for changing a distance from the objective lens to the field of view.

11. The surgical microscope according to claim 1 , wherein the microscopy optics comprise a zoom system for changing the imaging scale for a given fixed working distance.

12. The surgical microscope according to claim 1 , wherein the selecting, from the members of the group of plural different surgical tools, of the member corresponding to the surgical tool in the camera images uses a technique selected from a group of techniques, wherein the group of techniques comprises a template matching technique, a sliding window technique, and a Hough voting technique.