Digital head-mounted optical enlargement system

Abstract

The present invention relates to a system for generating and playing back images of an enlargement region, the system comprising a head-mounted holding device, to which an imaging unit, e.g. at least two cameras, is fastened, and a playback unit, which comprises e.g. at least two image playback devices, which can be aligned in a customised manner to the user's eyes, characterised in that central axes of the cameras form a camera plane and optionally point obliquely forwards to the enlargement region, relative to the vertical head axis and / or relative to the vertical axis of the head-mounted holding device, the playback devices form, by means of their projection directions, a playback plane relative to the camera plane, which playback plane is inclined at a bend angle relative to the camera plane, wherein the playback devices are between the camera plane and the relevant eye of the user, and wherein a free space between the playback devices and the user's cheeks in each case leave free a visual field underneath the playback device which allows the user to have a clear view of the enlargement region and / or the surroundings thereof.

Description

[0001] Digital head-mounted optical magnification system

[0002] The present disclosure relates to a head-mounted digital optical magnification system that is equipped both for viewing both eyes into digital eyepieces and for allowing the eyes to view a magnification area and its surroundings without obstruction.

[0003] Analog optical magnification systems have long been familiar to those skilled in the art. They provide each eye with a lens system that images the magnification range while simultaneously offering a view past the eyepiece. Typical designs have the eyepieces embedded in the right and left lenses of the eyeglasses or distally in front of the lenses of safety goggles.

[0004] Also familiar to those skilled in the art are digital magnification systems with cameras that generate digital mono or digital stereo images of the magnified area and present a magnified image to the user via an imaging device. This magnified image obscures the actual field of vision, making spatial orientation significantly more difficult. This problem becomes particularly problematic when the magnification system creates a type of augmented reality stereo image for the user. While this may be very magnifying and sharply displayed, such technologies make it almost impossible for the user to operate, for example, surgical instruments or a dental drill.

[0005] Some prior art developments propose displaying the magnified image on a glasses-like screen, e.g., as a stereo image. In this case, areas of the screen can be fully or partially transparent, allowing one to see through or past the displayed digital image. However, the light intensity of such flat, partially transparent displays is low and / or the image quality is too poor for use in the aforementioned environments.

[0006] In EP2937058A1, Ellerbrock describes a head-mounted system that uses a digital visor to create a stereo image of the magnification range that fully fills the field of view. The field of vision is darkened, creating the impression of a virtual world that prevents orientation outside the magnification range. In particular, the user would have to remove the visor to orient themselves in the treatment room or locate instruments, which poses problems in practical use. Benz and Micko describe glasses with at least one partially transparent screen and multiple optical detection units in DE 102017108235 A1. The partially transparent screen can display the viewing area translucently and also show markings in this area, such as the position of implants.Here, the digital image content is displayed and perceived by overlaying it in the same spatial angle as the real analog image content. This creates a superimposed appearance for the user of the digital augmented images and the real analog images. Magnification of the viewing area is not possible in this variant.

[0007] The present disclosure aims to solve the problems mentioned or to help in solving them.

[0008] Short description

[0009] The aforementioned problems of the prior art are solved or improved by the system described in claim 1. Further embodiments are described in the subclaims.

[0010] One aspect of the disclosure relates to a system for generating (capturing) and reproducing images of a target area (magnification area), a so-called digital magnification system. Preferably, the digital magnification system is used for capturing and reproducing stereoscopic magnified images.

[0011] The digital magnification system comprises a head-mounted holding device (short: head-mounted device or head-supporting device) for attaching the magnification system to the head of the user (wearer). The system further comprises an image recording unit (camera unit). The image recording unit can comprise at least two cameras (lenses) for recording digital images of the magnification area. Preferably, the cameras are arranged and configured to be able to record a stereo image of the magnification area. The image recording unit can be attached to the head-mounted holding device such that it is preferably located in front of the user's forehead during use of the magnification system. The position and / or orientation of the image recording unit relative to the head-mounted device is adjustable. The image recording unit is designed to record image information, e.g. photos or videos, of the magnification area.The magnification system further comprises a display unit with at least one, preferably at least two separate image display devices that can be arranged in front of the user's eyes. The image display devices can have eyepieces.

[0012] The playback unit can also be connected to the head-mounted device. The image information captured by the image acquisition unit can be displayed to the user virtually simultaneously via the playback unit. The image information can be modified, e.g., enlarged or recolored. In one embodiment, the time delay between image acquisition and image playback is less than 120 milliseconds, preferably less than 80 milliseconds, and particularly preferably less than 40 milliseconds, e.g., 20 milliseconds.

[0013] The central axes of the cameras can be inclined forward relative to the vertical head axis and / or relative to the vertical axis of the head support device, toward the magnification area. The central axes define a camera plane. The central axes (projection directions) of the display devices define a display plane that is inclined relative to the camera plane by a bend angle (tilt angle). The bend angle is preferably greater than 20°, e.g., greater than 30°, and particularly preferably greater than 40°.

[0014] The vertical axis of the head support device can coincide with the vertical head axis in the sagittal plane.

[0015] The display devices are located between the camera plane and the user's eyes. A portion of the field of view below the display device remains free between the display devices and the user's cheeks. In this free portion of the field of view, the user has a clear view of the magnification area and / or its surroundings.

[0016] In one embodiment, the diameter of the cameras is less than 30 mm, preferably less than 20 mm, and particularly preferably less than 15 mm, e.g., less than 12 mm. The length of the camera optics is preferably at least 1.5 times the camera diameter, preferably at least twice as large.

[0017] In one embodiment, the optics of the cameras are longer along their central axis than the length of the optics of the image display devices along their image axis. For example, the length of the camera optics can be at least 1.2 times the length of the optics of the image display devices. Alternatively, the optics of the image display devices or their eyepieces can be shorter along their longitudinal axes than the camera optics along their longitudinal axes.

[0018] In one embodiment, the image display devices have high-intensity displays. The displays preferably have chips with more than 2000x2000 pixels. The optics of the display devices are preferably short, so that the display devices do not protrude into the camera plane.

[0019] The magnification system may comprise a (first) housing. The housing may be attached to the headgear, particularly in front of the user's forehead when the headgear is worn. The cameras may be housed in the housing. The magnification system may comprise an image processing device that may be connected to the recording unit and / or the image display devices via digital lines. The image processing device may be housed in the housing.

[0020] The image display devices can be designed such that they display a stabilized image section of the images recorded by the cameras.

[0021] The camera plane can be inclined obliquely downwards relative to the vertical axis of the head-holding device and / or the vertical axis of the user's head at an acute angle of less than 60°, preferably less than 45° and particularly preferably less than 30°.

[0022] The image display devices can be arranged in an upper part of the user's field of vision, e.g., in the upper 70% of the natural field of vision. The area of ​​the field of vision below can be unobstructed, allowing the user a clear view of the magnification area and / or its surroundings. Thus, by appropriately focusing the eyes and orienting the head, the user can also detect objects that are not within the magnification area but are farther away from the eye than the magnification area.

[0023] The magnification system, e.g. the head support device, can be designed in such a way that the

[0024] The playback devices can be adjusted in their sagittal angular orientation relative to the user's head. In other words, the head support device allows the playback devices to be pivoted within the sagittal plane.

[0025] In one embodiment, the magnification system, e.g. the head-mounted device, can be designed such that the display devices can be adjusted in their angular orientation in a plane perpendicular to the sagittal plane.

[0026] The magnification system, e.g., the head-mounted device, can be configured such that at least one of the display devices is adjustable in its axial angular orientation. In other words, the magnification system can be configured such that an image rotation of the display is adjustable.

[0027] The magnification system, e.g., the head-mounted device, can be designed such that at least one of the display devices can be adjusted in its image height position. The image height position can be adjusted along an axis that is perpendicular to the central axis (projection axis) of the image display device.

[0028] In one embodiment, at least one of the display devices can be adjustable in its lateral image position. In other words, at least one of the display devices can be rotatable about an axis perpendicular to its central axis.

[0029] In one embodiment, image adjustment can be performed mechanically in at least one image display device. The image adjustment can include, for example, the magnification factor (zoom). Alternatively or additionally, image adjustment can be performed digitally electronically in at least one image display device, e.g., in an image-generating element of the image display device.

[0030] In one embodiment, the magnification system may include a (first) light source. The light source may be configured to uniformly illuminate at least the magnification area. Alternatively, the light source may be configured to illuminate at least the magnification area with different light frequency spectra and / or different light pulse sequences.

[0031] In one embodiment, the magnification system may comprise an image processing device. The image processing device may be configured to select images of the magnification area based on differences in the recorded light frequency spectra and / or light pulse sequences. Furthermore, the image processing device may be configured to modify images of the magnification area prior to display, e.g., to enlarge or recolor them, and to output the modified image information to the image display devices.

[0032] The magnification system may include an optical filter device. The filter device may be positioned and configured to filter the light incident from the magnification area onto the image recording unit, e.g., according to certain spectra. The filter device may be attached to the head-mounted device. The filter device may include one or more optical filters. In one embodiment, the optical filters are selectively activatable / deactivatable.

[0033] The camera unit can have at least two digitally magnifying cameras (camera optics, recording optics). The cameras can have a common focus area at a focus distance of 20 to 100 cm, preferably 20 to 50 cm. The cameras are preferably adjusted and positioned so that the focus lies exactly on the surface of the target object to be recorded, e.g., on the chewing surface of a tooth. In particular, the camera unit can have at least two digitally magnifying cameras. The camera unit can be arranged in the first housing. The first housing can be positionable or permanently connected to the head-mounted device. The camera unit can generate groups of at least two temporally coupled individual images in chronological sequence, which enable the generation of a digital stereo image.

[0034] The digital stereo image is generated in a digital image processing unit. The necessary image processing unit can be located in close proximity to the camera unit, e.g., in a shared housing with the camera unit. The digital magnifying cameras are connected to the image processing unit via digital cables.

[0035] The digital image processing unit can have at least two image outputs, preferably for two image display devices. One image display device can be mounted in front of the wearer's left eye when the magnification system is in place, and another image display device can be mounted in front of the wearer's right eye. The digital magnification system, e.g., its holding device, can be configured such that the digital image display devices can be pivoted to attach the digital magnification system. Furthermore, the digital magnification system can be configured such that the image display devices can subsequently be pivoted back into a suitable position in front of the user's eyes.

[0036] The distance between the image display devices can be individually adjusted depending on the user's eye distance. Furthermore, the height and orientation of the image display devices can be individually adjusted if necessary, creating a coherent, digitally magnified stereo image of the magnification area for the user within a portion of their field of vision.

[0037] In particular, the digital magnification system can be designed such that the field of view of the eyes is only partially occupied by the image display devices, so that the user's eyes, when swiveled downwards beneath the image display devices, can look through to the magnification area and / or the area surrounding the magnification area and into the open space. This allows precise, fast, and immediately intuitive orientation in space. Furthermore, the focusing of a head-mounted surgical light on the magnification area, the focusing of the magnifying cameras on the magnification area, and / or the wearer's view of the patient or the instrument table are enabled. These orientation functions do not require complex commands or electronic activations, only the natural movement of the eyes. The system is therefore not completely closed.Furthermore, the system does not need to be removed, for example, to view the magnification area with the naked eye. This offers advantages in terms of sterility and handling of the system.

[0038] The digital magnification of a magnification area as a stereo image or 3D image of the image display devices enables an optical magnification between 1.1x and 50x, preferably between 3x and 20x, particularly preferably between 4x and 14x, and even more preferably between 4x and 10x. The desired magnification can be adjusted by suitable commands, e.g., by voice commands, gesture control, and / or key commands from the user, for which the digital magnification system can have corresponding control or input elements.

[0039] The image display devices can be designed so that they can be selectively deactivated, e.g., by a voice command from the wearer. Deactivation can, for example, increase the transparency of the image display devices so that the wearer of the system can see through them. This is important in the event of malfunctions in the digital magnification system. The user can thus troubleshoot or adjust new settings on a monitor with the system still on their head, without contaminating the head-mounted system.

[0040] For protection, a protective screen, e.g. made of Makrolon or optically wavelength-selective material, can be attached distally in front of the image display devices, in particular to protect against splashes, splinters and / or radiation. The protective screen can preferably also protect the wearer's eyes when they look through the image display devices, e.g. to orient themselves in the room. The display devices, in particular their optics, are therefore short enough along their central axes so that they can be attached in the free space between the eyes and the protective screen, preferably without excessively restricting the wearer's field of vision. For example, the wearer's field of vision is blocked by the display devices to less than 70%, preferably to less than 50%, so that the wearer can orient themselves in the room.

[0041] The magnifying cameras can be mounted in front of the protective screen so that image capture is not affected.

[0042] The power supply of the digital magnification system and its electronic components, e.g., the magnifying cameras, the at least one image processing device, and / or the image display devices, can be provided via a power source, preferably a rechargeable battery. The power source can be part of the magnification system and / or an external power source. Furthermore, the magnification system can have at least one digital transmission device for transmitting the captured image data / information to a receiving device, e.g., in an external display device or to a database. In particular, the transmission device can be a wireless transmission device.

[0043] At least parts of the power supply and / or the image processing device and / or the transmission device can be attached to the head-mounted support device in such a way that they form a mechanical counterweight to the camera unit and / or the playback unit. This arrangement can offer ergonomic advantages to the wearer of the system by relieving strain on the wearer's neck muscles. For this purpose, the system can have at least one additional counterweight, which can be attached to the rear part of the support device. The additional counterweight and / or the aforementioned components that form the counterweight can be arranged in a (second) housing or in several additional housings.

[0044] The head-mounted device, which carries at least the magnifying cameras and the digital image display devices, can have a crown region (crown clasp) that rests at least partially on the user's head. Additionally or alternatively, the head-mounted device can have a ring region surrounding the side of the head, ensuring stable attachment to the user's head. The mechanical dimensions, e.g., the circumference of the ring region, and the elastic properties of the ring and / or crown region can be individually adjustable, allowing the head-mounted device to be adapted to the wearer, as is common with protective helmets, for example.

[0045] In order to achieve a high-quality and sufficiently large magnified image and to be able to display it to the user without restricting the user's view of the target object too much, certain system parameters, e.g. angular and positional relationships of individual system components to one another, are necessary.

[0046] Image display is preferably achieved via large, flat, digital image display elements, each of which is mounted at the distal end of the image display devices.

[0047] The ratio of the diameter to the length of the preferably cylindrical image display devices is at least 60%, preferably at least 80%. In other words, the diameter of the image display devices is preferably almost as large as their axial length along their axis of symmetry (projection axis). In one embodiment, the size ratio is 100% or more, i.e., the diameter of the image display devices is equal to or even greater than the axial length of the display devices.

[0048] In one embodiment, the axial length and / or the diameter of the image display devices is between 5 and 40 mm, preferably between 15 and 30 mm, particularly preferably between 20 and 25 mm, e.g. 22 mm.

[0049] Preferably, the focal length of the image display devices is less than 70 mm, preferably less than 50 mm, and particularly preferably less than 40 mm. Furthermore, the focal length of the image display devices is approximately twice their axial length, e.g., it is in the range of 150% to 260% of the axial length of the image display devices. The distance of the image display devices from the user's eyes is approximately the same as the axial length of the image display devices.

[0050] The magnification area can, for example, be the chewing surface of a tooth to be treated. Preferably, the magnification area lies in the common focus of the at least two magnifying cameras. The focal length of the magnifying cameras is greater than the focal length of the image display devices. Preferably, the focal length of the magnifying cameras is more than four times the focal length of the image display devices, particularly preferably more than six times the focal length.

[0051] The magnifying cameras are securely mounted on the head-mounted device in the area in front of the user's forehead. The cameras' central axes / camera axes point downward, e.g., almost vertically, toward the magnification area and define the cameras' focus directions. A first camera angle between the cameras' central axes and the vertical head axis is preferably less than 60°, particularly preferably less than 30°.

[0052] The central axes (image axes) of the image display devices are preferably inclined relative to the vertical head axis by the image angle. The image angle can be more than 45°, preferably more than 55°, particularly preferably more than 65°. When looking into the image display devices, the user's eyes are therefore directed predominantly straight ahead and only slightly downward. In one embodiment, the first camera angle is smaller than the image angle.

[0053] In one embodiment, the display devices are tilted relative to the cameras by a tilt angle (bend angle). The tilt angle is preferably more than 10°, particularly preferably more than 20°.

[0054] The direct gaze of the eyes in the direction of the magnification area is thus possible and can be easily achieved by an eye movement of the user, such as looking at a keyboard when typing in front of a higher screen.

[0055] The magnification system, in particular the head-mounted device or the positioning of the cameras, is such that the user's nose does not interfere with the beam path of the magnifying cameras and / or the image display devices. The first light source can comprise one or more light-emitting elements, which can preferably be arranged in the area between the cameras or around the cameras to illuminate the magnification area. Alternatively or additionally, one or more second light sources can be arranged distally in front of the cameras. The first and / or second light sources can comprise, for example, a light-emitting diode (LED), preferably an LED spotlight.

[0056] In one embodiment, the image display device is arranged such that the free angle, i.e., the angle of the user's free field of view downwards, beneath the image display devices, is at least large enough for the user to see the entire magnification range with the naked eye. Preferably, the free angle is large enough for the entire focus range and the entire magnification range to be visible to the naked eye.

[0057] The positioning, particularly the distance, of the image acquisition unit and image display devices from the vertical head axis determines how much force the user must exert to maintain their head in the desired position and orientation. A shorter distance reduces the head-heaviness of the magnification system. A longer distance increases the free angle and allows the user to view a larger area, for example, the area surrounding the magnification area, with the naked eye.

[0058] The optical filter device can be designed to at least partially spectrally filter the light from the light source reflected from the magnification area or to reduce the amount of light reaching the unprotected eye within the free angle. Alternatively, the magnification system can have a second filter device that fulfills this purpose.

[0059] The magnification area can be marked and illuminated by a bright spot light whose beam is directed toward the common focus area of ​​the magnifying cameras. The light source can be mounted between the cameras, radiating downwards.

[0060] The head-mounted magnification system can be designed such that the viewing angle of the eyes relative to the vertical head axis of the user is less than 55°, preferably less than 45°.

[0061] In one embodiment, the image display devices are arranged so that they do not obstruct the beam path to the cameras. The display unit may have a recess or bevel on the upper edge to keep the beam path to the image capture unit clear.

[0062] Preferably, the image display devices are located between the user's eyes and the beam path of the cameras of the image recording unit, viewed from the side (sagittal). In one embodiment, the image display devices are located closer to the beam path of the cameras than to the eye.

[0063] The magnifying cameras are preferably positioned at a predominantly horizontal distance of 80% to 140% of the average interpupillary distance of an adult. Two cameras are preferably used to capture a stereo image. The axial distance of the cameras on the underside is particularly preferably between 90% and 120% of the average interpupillary distance of an adult, which is assumed to be 63 mm, for example. Larger camera distances are possible to achieve greater 3D depth in the stereo image.

[0064] In one embodiment, the system has at least two image display devices for displaying the stereo image. Preferably, the focal lengths of the display devices are separately adjustable for the right and left eyes.

[0065] The distance between the image display devices is preferably equal to or slightly smaller than the distance between the cameras. For optical reasons, this distance is adjusted to the user's individual eye distance.

[0066] In the event that the user's eyes have a different height position, which is rather rare, the height correction of the image display can be carried out mechanically or digitally on at least one eye.

[0067] In the event that the user's eyes have a different angular orientation, which is possible but very rare, an angle correction of the image display can be performed mechanically or digitally in at least one eye. For height and angle correction, for example, the position and / or orientation of one image display device relative to the other image display device can be changed. The digital magnification system is thus adaptable to different users and can be optically optimally adjusted. Mechanical adjustment of the image display devices can include mechanical adjustment of the height, distance and axial angular alignment, as well as the tilt angle alignment of the image axis relative to the camera axis, as seen from the side.

[0068] A digital electronic adjustment of the image display devices can comprise a displacement of the activated light emitters of the display device in the image plane as well as a rotation of the image orientation about the axis perpendicular to the image plane of the image display devices.

[0069] The image display device may comprise a lens optics and an electronic display. An alternative embodiment comprises a surface-projected display, similar to a hologram, as the display device. The display may comprise one of the following display types: a liquid crystal display (LCD), a thin film transistor (TFT) display, an in-plane switching (IPS) display, a retina (IPS-LC) display, a light-emitting diode (LED) display, an organic light-emitting diode (OLED) display, and / or an active matrix OLED (AMOLED) display.

[0070] In one embodiment, the digital magnification system is a digital magnifying glass or a digital microscope.

[0071] In one embodiment, the magnification system includes a data processing unit. The data processing unit can be attached to the headrest device or arranged on or near the user's body. The data processing unit can be structurally combined with the recording unit, e.g., housed in the same housing.

[0072] The data processing unit is equipped to modify the recordings as needed, create image sections, and / or send images to a playback device. In one embodiment, the data processing is configured for multiple image channels, e.g., for stereo or multi-camera systems. The data processing unit can comprise the image processing device.

[0073] The electronic connections between the data processing unit and the image acquisition unit can be implemented via cables and / or wireless technology. The power supply can be implemented via cables and / or wireless technology. The data processing unit can be connected to the transmission device.

[0074] The playback device is connected to the data processing device using information technology. The playback device can be structurally combined with the recording unit. The magnification system can comprise a storage device for image data and / or other data. The storage device can be configured to store the data temporarily or permanently. The storage device can be connected to one, several, or all of the aforementioned components of the magnification system, e.g., to the data processing unit, the image processing unit, the image recording unit, and / or the image playback device.

[0075] In one embodiment, the light source has a light focus that lies in the focus area of ​​the recording optics.

[0076] In one embodiment, the head-supporting device has lateral straps, circumferential ring belts, and / or padding elements. The padding elements can be positionable relative to the crown clip. Furthermore, the padding elements can be removable, e.g., for cleaning or replacement. The padding elements can be made of an elastic material, e.g., silicone, neoprene, or the like. Preferably, the head-supporting device comprises at least two padding elements for support on the forehead and the back of the head of the user. The head-supporting device can further comprise an adjustable head ring. The circumference of the head ring can be adapted to the wearer's head circumference. The padding elements can extend along the circumference of the head ring. Additionally or alternatively, the head-supporting device can comprise a head cage, such as that found on a construction helmet.The head-mounted device may further comprise connecting elements to connect the magnification system to a helmet or a mask, e.g. a surgical visor.

[0077] In one embodiment, the transmission device comprises a radio unit and / or a connection to a computer system for image processing and data storage.

[0078] In one embodiment, the energy source is replaceable and / or connectable to an external energy supply in order to replace or recharge the energy source.

[0079] In one embodiment, the focus directions and / or positions of the display optics of the image display devices can be adjusted separately for each eye. Preferably, the system features mechanical fine adjustment of the position and / or orientation of the individual display optics relative to the head-mounted device. Furthermore, the display optics can preferably be adjusted to a suitable position, distance, focal length, and focus direction in front of the eye according to the optical and anatomical requirements of the wearer's eyes. Furthermore, the user's field of view of the magnification area is preferably not completely obscured by the display devices. Preferably, the field of view is not obscured by the display devices by more than 70%, particularly preferably not more than 50%. Furthermore, the field of view for the eyes next to and below the display devices is clear or only insignificantly obscured.Furthermore, the field of view for the eyes to the display device is preferably free and unobstructed.

[0080] In one embodiment, the image capture unit is configured to digitally transmit the image information to a CPU or computer unit. In one embodiment, the images to be displayed are transmitted digitally to the display unit. In one embodiment, the image capture unit is configured to transmit the captured image information directly to the playback unit.

[0081] In one embodiment, the playback unit is designed to display additional information during image playback, e.g. image data, video data, graphic (position) information and / or markings.

[0082] In one embodiment, the system comprises positioning elements for laterally displacing the display device in front of the eye. The positioning elements can be configured to provide one, several, or all of the following functionalities: adjusting the interpupillary distance, adjusting the downward tilt, shifting the display unit up or down relative to the headrest, changing the distance of the display unit from the eye, and adjusting the display optics relative to the headrest.

[0083] In one embodiment, the vertex region has an arch element extending across the head from anterior to posterior.

[0084] In one embodiment, the magnification system, e.g. the image processing unit, is designed to recognize patterns and shapes in the recorded images, e.g. for detecting caries on the tooth and / or changes in the soft tissue in the mouth. Based on this recognition, the reproduced images can be enhanced, e.g. with color highlighting, false color representation, markings and / or labels. In one embodiment, the light source is at least 500 LUX, preferably at least 20,000 LUX, bright, and the amount of light emitted is continuously adjustable. Additionally or alternatively, the magnification system has a selectively activatable radiation source or second light source for radiation / light with a particular spectrum. The radiation source or second light source can be pulsed alternately with the (first) light source.In one embodiment, the light sources and / or the radiation source can be designed for spectrally specific illumination or irradiation of the viewing field with selectively reflected spectra.

[0085] In one embodiment, the recording unit has fixed imaging properties with magnification. In one embodiment, the recording unit has variable imaging properties with magnification.

[0086] In one embodiment, the system has a combined magnification. The combined magnification includes a recording zoom and a digital zoom during playback. The playback unit can be configured to receive and display the complete recorded (and processed) images as input. Alternatively, the playback unit can be configured to receive and display only a magnified section of the recorded images. The image in the playback unit can be displayed in part of the image area or fill the entire image area.

[0087] One aspect of the disclosure relates to a method for recording and reproducing images, in particular stereoscopic enlarged images of a target area. In a first method step, image information, e.g., an image and / or a video, of the target area is recorded using a recording device (image recording unit). In a second method step, the image information is processed in an image processing unit, e.g., an image section is enlarged and / or a stereo image is generated. For this purpose, the image section can be adjusted. In a third method step, the image information is electronically reproduced via a reproduction unit.

[0088] In one embodiment, optimization is performed using image filters during the recording and / or processing of the image information. Furthermore, a light source can illuminate the target area continuously or in pulsed bursts in certain spectra to support the recording. Spectral filters can be used to record the image information to relatively emphasize light components. This can be advantageous for spectral analysis and coloring of abnormal features. In one embodiment, the image information is analyzed, e.g., using pattern recognition. For example, image elements can be filtered and / or overlaid. Furthermore, entire images or regions thereof can also be overlaid.

[0089] In one embodiment, at least one, preferably several, particularly preferably all method steps run automatically and without or with as little user interaction as possible.

[0090] The digital magnification system according to the present disclosure offers the user a visually very good, bright, and high-contrast magnified image of the magnified area and simultaneously allows the unaided eye, or the eye corrected with vision aids and / or protected by safety goggles, a clear view of the magnified area and its wider surroundings. Thus, it enables the user to orient themselves naturally in space and to find the targeted magnified area and to locate instruments and objects in the room intuitively and without further operating steps or command inputs. This enables the user to wear the magnification system for extended periods without impairing their spatial orientation. Furthermore, the user is given a clear view of the magnified area without the risk of contamination and without additional commands, e.g., voice commands.

[0091] The possible digital magnifications are, for example, up to 8 times, 12 times or 16 times the real target area, which cannot be achieved with analog optical head-mounted systems without the associated considerable limitations, e.g. very high weight and large dimensions.

[0092] Furthermore, the digital magnification system offers the possibility of overlaying the digital magnification images and / or enhancing them with additional information and displaying the enhanced image information to the user.

[0093] Short description of the characters

[0094] Fig. 1 is a schematic front view of the digital magnification system according to an embodiment of the present disclosure. Fig. 2 is a schematic side view of the digital magnification system according to an embodiment of the present disclosure.

[0095] Fig. 3 is a schematic side view of the digital magnification system, particularly its size and angle relationships, according to an embodiment of the present disclosure.

[0096] Description of the figures and embodiments

[0097] Figure 1 schematically shows an embodiment of the magnification system 100 on the head 1 of a user. The magnification system 100 has a head-mounted device 14 to which a first housing 19 with two magnifying cameras 11.R, 11.L is attached. Furthermore, the magnification system 100 has two image display devices 12.R, 12.L, which are mounted at a short distance in front of the eyes 3.R, 3.L of the user. The cameras 11.R, 11.L are housed in the housing 19. The distance between the cameras 11.R, 11.L is preferably fixed. The user's individual interpupillary distance 53 determines the distance 52 to which the image display devices 12.R, 12.L must be set. If necessary, the user can individually adjust a height difference between the image display devices 12. R, 12. L and / or a rotation angle difference of the image orientation in the image display devices 12. R, 12. L.In Figure 1, a light source 16 is mounted centrally between the cameras 11.R, 11.L on or in the upper part of the housing 19 to illuminate the magnification area 27. The light source 16 is positioned far enough in front of the nose that the nose does not obscure the light rays 26 of the light source 16.

[0098] Alternatively, multiple light sources can be arranged to create a clear illumination area within the magnification area 27. Cameras 11.R, 11.L focus on this magnification area 27. Using magnifying optics, they each generate magnified images of the magnification area 27. A stereo image or a 3D surface image is generated from the image information of both cameras 11.R, 11.L using an image processing device (not shown). The focus directions 21 of cameras 11.R, 11.L span the camera focus angle 47.

[0099] The image processing device may also be arranged in the housing 19. In one embodiment (not shown), the image processing device may be connected separately by cable, e.g., if the image processing device is positioned further back.

[0100] A rechargeable battery for supplying the electronic components with electrical energy can be housed in a second housing 13. The second housing 13 is located posterior to the first housing 19. The second housing 13 can form a mechanical counterweight to the image recording unit 11 and the image display devices 12, which are arranged in front of the user's face. The head-mounted device 14 is designed such that the first housing 19 with the cameras 11 can be stably mounted thereon, wherein the position and orientation of the housing 19 can be adjustable. The head-mounted device 14 is further designed such that the second housing 13 can be stably mounted thereon, wherein the position and orientation of the housing 13 can be adjustable.

[0101] In the illustrated embodiment, the head-mounted device 14 comprises a crown clip and a circumferential head ring 17. The circumference of the head ring 17 is individually adjustable, e.g., to the user's head circumference. The head-mounted device 14 allows for stable attachment of the entire magnification system 100 to the user's head.

[0102] The image display devices 12.R, 12.L are also attached to the head-mounted device 14 and connected to the housing 19 or to the cameras 11.R, 11.L (not shown). The system 100, in particular the head-mounted device 14, is designed such that a tilt angle 43 (see Figure 2) between the cameras 11.R, 11.L and the image display devices 12.R, 12.L can be individually adjusted. The image display devices 12.R, 12.L can be unlocked and pivoted out from this individual position, e.g., to remove the system 100 from the head and then replace it in the same position. The pivoting can increase the tilt angle 43. Furthermore, the system 100 is designed such that the position, distance and angular orientation of the image display devices 12. R, 12. L relative to one another are adjustable.

[0103] In Figure 1, the magnification area 27 is located on the surface / chewing surface of a tooth 31. This chewing surface, or—at high magnification—a section thereof—is imaged in magnified form by the cameras 11.R, 11.L and, preferably after image optimization by the image processing device, is reproduced in magnified form by the image display devices 12.R, 12.L. To view the image, the user simply directs their gaze toward the image display devices 12, i.e., diagonally forward and not directly downward toward the magnification area 27 (see Figure 2). A characteristic angular relationship prevails, which can be seen in a side view.

[0104] Figure 2 shows a schematic side view of an embodiment of the magnification system 100. The headrest device 14 has a crown clip that is supported on the forehead and the back of the head of the user via two head cushions 15. The camera axes 21 are directed towards the magnification area 27. In particular, the camera axes 21 point steeply downward and, together with the vertical head axis 24, form the first camera angle 41. The first camera angle 41 can be adapted to the user's anatomy and their setting habits. For this purpose, the orientation of the image display devices 12 is at a characteristic tilt angle 43 between the camera axis 21 and the image axis 22. In one embodiment, the view of the image display devices 12 is only slightly tilted downward, and the image angle 42 is at least 60°, preferably at least 75°.

[0105] The bending angle 43 can be adjusted by reorienting the housing 19 or the head support device 14 relative to the user's head and then aligning the image display devices 12 exactly with the eyes 3.

[0106] The second housing 13 is arranged at the rear of the head-mounted device 14. A power source, e.g., in the form of a battery, is located in the second housing 13. The second housing 13 is arranged at the rear to provide balance by acting as a counterweight to the first housing 19. Additionally, additional batteries or power supplies (not shown) can be connected to the first housing 19 or the second housing 13 via contacts if long, uninterrupted use is planned.

[0107] Figure 2 shows that the free field of view 49 of the eye 3 is largely unobstructed downwards, beneath the image display devices 12. The enlarged image display occurs in the upper central region of the field of view, similar to a raised screen on a desk, where the view of the keyboard is unobstructed. The virtual distance of the enlarged image is determined by the settings of the optics and digital chips in the cameras, the image processing unit, and / or the image display devices 12.

[0108] Figure 3 schematically shows the relative positions and orientations of the components of the magnification system 100, as well as their angular and size relationships. Unless explicitly stated otherwise, the components, size, and position relationships depicted in Figure 3 correspond to the components, size, and position relationships previously described with reference to Figures 1 and 2.

[0109] The optics in the cameras 11 and in the playback devices 12 are only indicated schematically. In particular, the illustrated lens shape and number may vary in actual use. The image angle 42 is shown between the vertical head axis 24, which in Figure 3 corresponds to the vertical axis of the head-mounted device, and the image axis 22. Relative to the vertical axis 24 of the head-mounted device, the recording device 11 is tilted by the first camera angle 41.

[0110] The viewing angle 44 extends between the free viewing direction 29, which describes the direction of the free view of the eyes 3 to the magnification area 27, and the vertical axis.

[0111] In the sagittal view in Figure 3, the camera axis 21 is the same for both cameras 11.L and 11.R. The two camera axes 21 form a plane and intersect at the common focus in the magnification range 27 (see Figure 1). The playback device 12 is inclined by the bend angle 43 relative to the recording direction 21.

[0112] The image axes 22 of the two display devices 12.R, 12.L form a plane in Figure 3, which appears from the side as a single display axis 22. In reality, the display axes 22.L, 22.R of the left and right display devices are precisely aligned with the user's eyes 3.L, 3.R and can therefore also differ in the side view, which is difficult to depict and has therefore been simplified.

[0113] The free viewing direction 29 spans a second camera angle 48 with the focus direction 21 of the cameras 11.

[0114] The display devices 12 are positioned between the camera plane / axis 21 and the user's eyes 3. The free distance 123 between the eyes 3 and the display devices 12 determines the size of the user's free field of view 49. In particular, the free distance 123 can correspond to the focal length of the display devices 12. As can be seen in Figure 3, the free distance 123 can be selected such that the image display devices 12 do not intersect the camera plane 21. Thus, shadowing of the beam path from the magnification area 27 to the cameras 11 can be avoided. In Figure 3, the free distance 123 corresponds approximately to the axial length 121 of the image display devices 12 along their image axis 22. In one embodiment, the free distance 123 can be smaller than the axial length 121 of the image display devices 12. Alternatively, the free distance 123 may be greater than the axial length 121 of the image display devices 12.

[0115] The diameter 122 of the image display devices 12 shown in Figure 3 corresponds approximately to the axial length 121 of the image display devices 12. In one embodiment, the diameter 122 of the image display devices 12 may be smaller than the axial length 121 of the image display devices 12. Alternatively, the diameter 122 of the

[0116] Image display devices 12 may be greater than the axial length 121 of the image display devices 12.

[0117] In one embodiment, the focal length of the optics of the display devices 12 may be smaller than the distance of the display devices 12 to the camera plane 21.

[0118] List of reference symbols

[0119] .R right

[0120] .L left

[0121] I Head of the wearer

[0122] 3 Eye or eyes of the wearer

[0123] 4 Mouth of the wearer

[0124] 5 Nose of the wearer

[0125] II Magnifying camera

[0126] 12 Image display device

[0127] 13 Second housing

[0128] 14 Head support device

[0129] 15 upholstery elements

[0130] 16 Light source

[0131] 17 Head ring

[0132] 19 first housing

[0133] 21 Focus direction / shooting direction of the camera 11

[0134] 22 Image axis, central axis of the image display device 12

[0135] 24 Vertical axis of the user's head

[0136] 25 Intersection of image axis 22 with vertical axis 24

[0137] 26 Beam of the light source 16

[0138] 27 Magnification range in the focus center of the cameras 11

[0139] 29 free line of sight of the unaided eye to the magnification area 27

[0140] 31 tooth

[0141] 41 first camera angle between focus direction 21 and vertical axis 24

[0142] 42 angle of view between image axis 22 and vertical axis 24

[0143] 43 Tilt angle / bend angle between focus direction 21 and image axis 22

[0144] 44 Viewing angle between the free viewing direction 29 and the vertical axis 24

[0145] 47 Camera focus angle between the focus directions 21 of the cameras 11

[0146] 48 second camera angle between free viewing direction 29 and focus direction 21 free field of view between cheek and image display device 12 distance between display devices 12 distance between eyes 3 electronic magnification system axial length of image display device 12 diameter of image display device 12 free distance of image display device 12 from eye 3

Claims

Patent claims 1. System (100) for generating and reproducing images of a magnification area (27), comprising a head-mounted device (14) to which an image recording unit, e.g. at least two cameras (11), is attached, and a reproduction unit, which e.g. has at least two image reproduction devices (12) that can be individually aligned to the eyes (3) of the user, characterized in that - central axes (21) of the cameras (11) form a camera plane and optionally point obliquely forwards to the magnification area (27) relative to the vertical head axis (24) and / or relative to the vertical axis of the head support device (14), - the display devices (12) form a display plane relative to the camera plane with their projection directions (22) which is inclined at an angle (43) relative to the camera plane, - wherein the display devices (12) are located between the camera plane and the respective eye (3) of the user, - and wherein a free distance (123) between the display devices (12) and the cheeks of the user leaves a field of view below the display device (12) which allows the user a free view of the magnification area (27) and / or its surroundings.

2. System (100) according to claim 1, wherein the system (100) comprises a housing (19), wherein the cameras (12) are housed together with an image processing device in the housing (19), wherein the housing (19) is mounted in front of the forehead of the user and wherein digital lines lead from the image processing device to the image display devices (12).

3. System (100) according to claim 1 or 2, wherein the image display devices (12) display a stabilized image section of the images recorded by the cameras (11).

4. System (100) according to one of the preceding claims, wherein the camera plane is inclined obliquely downwards relative to the vertical axis of the head-holding device and / or the vertical axis (24) of the user's head at an angle of less than 60°, e.g. less than 45° or less than 30°. System (100) according to one of the preceding claims, wherein the camera plane is inclined relative to the image display plane at a bend angle (43) of more than 20°, e.g., more than 30° or more than 40°. System (100) according to one of the preceding claims, wherein the image display devices (12) are arranged in the upper 70% of the field of vision of the eyes, and a free field of vision area is present below, allowing the user a clear view of the magnification area (27) and / or its surrounding area. System (100) according to one of the preceding claims, wherein the display devices (12) can be adjusted in their sagittal angular orientation relative to the user's head, e.g., to the vertical axis (24) and / or to a horizontal head axis. System (100) according to one of the preceding claims, wherein at least one of the display devices (12) is adjustable in its axial angular orientation and thus in the image rotation of the display.System (100) according to one of the preceding claims, wherein at least one of the display devices (12) is adjustable in its image height position. System (100) according to one of the preceding claims, wherein at least one of the display devices (12) is adjustable in its lateral image position. System (100) according to one of the preceding claims, wherein an image adjustment for at least one image display device (12) is carried out mechanically. System (100) according to one of the preceding claims, wherein the image adjustment for at least one image display device (12) is carried out digitally or electronically in an image generating element of the image display device (12). System (100) according to one of the preceding claims, wherein the system (100) has a light source (16) which is configured to uniformly illuminate at least the magnification area (27) or wherein the light source (16) is configured to... To illuminate the magnification area (27) with different light frequency spectra and / or different light pulse sequences. The system (100) according to one of the preceding claims, wherein the system (100) comprises an image processing device configured to select the images of the magnification area based on differences in the recorded light frequency spectra and / or light pulse sequences and / or to output them in a modified form.

Images