EP4208771A1 - Verfahren zur erkennung einer bewegung eines eingabegegenstands gegenüber einer anzeigevorrichtung über optische merkmale, aufnahmevorrichtung mit recheneinheit, anzeigevorrichtung und kraftfahrzeug - Google Patents
Verfahren zur erkennung einer bewegung eines eingabegegenstands gegenüber einer anzeigevorrichtung über optische merkmale, aufnahmevorrichtung mit recheneinheit, anzeigevorrichtung und kraftfahrzeugInfo
- Publication number
- EP4208771A1 EP4208771A1 EP21758377.2A EP21758377A EP4208771A1 EP 4208771 A1 EP4208771 A1 EP 4208771A1 EP 21758377 A EP21758377 A EP 21758377A EP 4208771 A1 EP4208771 A1 EP 4208771A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- image
- pattern
- input object
- surface structure
- input
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0484—Interaction techniques based on graphical user interfaces [GUI] for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1365—Matching; Classification
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/20—Movements or behaviour, e.g. gesture recognition
- G06V40/28—Recognition of hand or arm movements, e.g. recognition of deaf sign language
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04109—FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/07—Target detection
Definitions
- the invention relates to a method for controlling a display function of a display device.
- Some electronics manufacturers offer styluses for electronic devices such as tablets and displays that allow the user to draw or write on their device.
- some manufacturers have long been concerned with accurately detecting the position, posture and movement of the pen as an input device in relation to the electronic device. This allows virtual brush tips to be simulated as a 3D object, which enables the drawing device to behave in a realistic manner when drawing.
- the said systems are based on inductive methods or other hardware solutions (accelerometer, gyro sensor, optical and magnetic) and require special hardware.
- a magnetic field is generated via a screen or drawing surface and an input device comprising at least three coils is moved in the magnetic field.
- An orientation of the input device can be detected on the basis of the orientation of the respective coils in the magnetic field above the screen or drawing surface.
- a movement around a roll, tilt and tilt axis corresponds to a movement and/or a rotation around one of the respective axes three-dimensional coordinate system whose origin is on the screen surface.
- DE 11 2013 003647 T5 discloses a display device with a computing unit for detecting gesture and touch inputs via a touch screen by means of force sensing.
- the display device has a touch screen with a force sensor, which is set up to measure a force and a force center on the screen surface. If the center of gravity is within a boundary, for example within the screen surface, a force input and a touch gesture can be recognized when the input force exceeds a threshold value and a function can be controlled by a computing unit.
- DE 10 2011 084 809 A1 discloses a user interface and a method for computer-aided control of the user interface.
- any parameter values are set via a user interface by means of a rotary movement of the token using a token which has the shape of a puck and has a barcode printed on the underside.
- Said token can be placed on a surface of a touch screen, with a recording device detecting the underside of the token with the barcode on the side of the screen surface facing away from the user and thereby determining a position and alignment of the token on the touch screen.
- a parameter can be set by a user by rotating the token.
- a disadvantage of the known control methods is that user input is restricted to a special input medium, namely the token.
- DE 10 2017 004 860 A1 discloses a system for handwriting recognition in a vehicle via an input surface of a touchpad using a Camera and a computing unit known.
- a hand or a hand movement of a user directed towards the touch-sensitive input element is detected by means of the camera.
- the computing unit determines the entered character by means of a shape comparison between a reference character stored in the database and the rotationally transformed character recorded by the camera unit.
- a disadvantage of the known method is that only an orientation in a tilting direction of the hand and with respect to the touchpad is detected and not an object orientation in a rolling direction or in a tilting direction, therefore in all three dimensions.
- the object of the invention is to provide a movement comprising a rotation and/or a translation of an input object with respect to a screen surface in a motor vehicle.
- the invention provides a method for controlling a display function of a display device, comprising the following steps: a) Capturing images of an image sequence of a surface structure of an input object in an input area on a user-facing side of a screen surface of the display device using a recording device, with the input area being viewed from a direction away from the user side of the screen surface is optically detected through the screen surface; b) recognition by the recording device that a surface structure is in focus on the user-facing side of the screen surface of the recording device; c) searching the first image of the image sequence for a pattern in the surface structure of the input object by a computing unit; d) If a pattern of the surface structure of the input object is recognized in the respective images of the image sequence, the computing unit determines an orientation and/or a position of the pattern of the surface structure of the input object in the input area; e) determination of a motion vector of the pattern between the respective orientation and position of the surface structure between an image and an image of the image sequence following the image (4) by the computing
- the invention is characterized in that it is tracked when the input object is tilted and/or tilted and/or unrolled by using the processing unit to detect a change in the pattern in the images of the image sequence that occurs during tilting and/or tilting and/or unrolling motion vector is mapped as tilting and/or rolling and/or pitching of the input object.
- the surface structure can be the part of the input object that is visible to the recording device.
- the surface structure can contain a pattern. If the input object is a finger, for example, the surface structure can be the part of the finger visible to the recording device with respect to the screen surface, hence a finger outline or the skin surface of the part of the finger facing the screen surface.
- the pattern can then be an image of a depth profile of the skin surface of the finger, such as the papillary ridges of the fingertip, which can leave a fingerprint.
- the recording device can change the visible image of the pattern, hence the fingerprint.
- the processing unit of the recording device can determine a movement vector of the finger for controlling a display function from the change in the fingerprint of the papillary ridges visible to the recording device and/or from a change in the part of the surface structure visible to the recording device.
- the respective tilting, tilting or rolling movement can include a rotational movement about a coordinate axis of a three-dimensional Cartesian coordinate system, which can have its origin on the screen surface.
- the x-axis on the screen surface of the display device can be in a longitudinal direction
- the z-axis of the coordinate system can be perpendicular to the screen surface pointing to the side facing the user.
- a tilting motion may be a rotation of the input object about the y-axis
- a tilting motion may be a rotation of the input object about the x-axis
- a rolling motion may be a rotation about the z-axis.
- the respective tilting, tilting or rolling movement can also include a combination with a further tilting, tilting or rolling movement or a combination with a translational movement of the input object on the screen surface.
- the display device can include a screen with a screen surface via which a touch input can be made by means of the input object.
- the screen surface of the touch screen of the display device can have a side facing the user and a side remote from the user.
- On the user-facing side of the screen a user who, for example using a finger as an input object to provide user input on the touch screen.
- the display device can be a touch screen of a mobile device, such as a smartphone, a tablet or a computer, or a touch screen of a motor vehicle.
- the input object can be, for example, any object, such as a finger on the user's hand or an eraser.
- a capture device may be located on the user-remote side of the screen surface of the display device and optically capture the user input on the touch screen through the input object.
- the recording device can be attached in or behind the display of the touch screen and can be, for example, a holographic-optical element, a display camera or a camera behind a translucent display.
- a sequence of images of the side of the screen surface facing away from the user is now recorded by the recording device.
- the camera device of the recording device can have a focus, which can be set on the user-facing side of the screen surface or in an area close to the user-facing side of the screen surface.
- An input object with a surface structure for example a finger with a depth profile, in particular a papillary ridge pattern for a fingerprint, can be brought into the focus of the recording device near the screen surface on the user-facing side in order to make a user input.
- the surface structure can be the part of any input object visible to the recording device.
- the surface structure can comprise a pattern, in which case the pattern can also have a depth profile, such as the depth profile of the fingerprint.
- the recording device is set up to recognize the surface structure of the input object, and therefore the surface structure of the finger.
- the recognition of the pattern in the surface structure of the finger can be carried out by the processing unit in an initial image as the first image of the image sequence from which the input object is in the focus of the recording device. det, be made.
- the processing unit can search for a pattern in the surface structure. This can be done, for example, by means of an interpolation or a vectorization of the respective image in the image sequence.
- the initial image can be a first image, which the recording device records of the surface structure, and can be used as a reference image for determining a change in the pattern during a rolling and/or tilting and/or tilting movement of the input object.
- the respective rolling, tilting or tilting movement can be combined with a translational movement of the input object in a plane parallel to the screen surface facing the user.
- the processing unit can calculate a motion vector for the respective movement from the respective change in the pattern in an image of the image sequence compared to the reference image and/or to a previous image in the image sequence.
- the arithmetic unit for calculating the motion vector can also use image sizes that change in comparison to the reference image and/or to a previous image in the image sequence, such as contrast, image sharpness or scaling.
- the surface structure which is located opposite the side of the screen surface facing the user, can also be visible to the camera device, a depth profile of the surface structure.
- the camera device of the recording device can be set up to recognize the depth profile of the surface structure, such as the fingerprint of a finger or a rough surface of an input pen.
- the pattern can have prominent points or a connection of the prominent points of the surface structure.
- the pattern may comprise a number of distinctive ridges of the fingerprint of the respective finger. If, for example, a finger is placed lengthwise on the screen surface, the recognized pattern can, for example the fingerprint and the surface structure must be the part of the body of the finger that is visible to the recording device. If a pattern is detected in the surface structure of an object, for example the prominent ridges, an alignment and/or a position of the pattern and thus of the input object in the input area of the touch screen can be recognized by the processing unit.
- the processing unit can use the difference between the recognized pattern and the stored pattern to determine a movement vector and thus an alignment of the input object in the input area of the touchscreen.
- the stored pattern can be a pattern stored before the input or a pattern learned in an initial image of the image sequence.
- a position of the input object in the input area can also be detected using the pattern.
- a position of the input object in the input area can also be determined independently of the pattern.
- the recording device can be designed to record from an optically recorded surface structure of any non-reflective or transparent input object.
- the pattern may be, for example, a perimeter or an outline of that part of the surface structure of the input object that is visible to the imaging device.
- the processing unit can determine a motion vector of the input object from the change in the alignment and/or position of the pattern between at least a first image in the image sequence after the initial image and a second image in the image sequence following the first image.
- the arithmetic unit can control a display function of the display device by means of the movement vector.
- a rotation of the pattern about a normal axis of the input object with respect to the screen surface and thus a rotation of the input object for controlling the display function can be determined from the alignment of the pattern.
- any object can be used as an input object for an input via a touch screen, provided the object has a corresponding opacity and a non-reflective surface structure.
- this can be a finger or a pen.
- a 3D input with all degrees of freedom (rotation, translation, if necessary pressure and height) and thus new operating approaches is made possible.
- no further input device has to be carried along and a possible loss of the input device is irrelevant since, for example, a finger can also be used as an input device and space can thus be saved.
- the invention also includes embodiments that result in additional advantages.
- the processing unit can use image processing to perform pattern recognition in the initial image of the surface structure captured by the recording device. This can be done, for example, by means of an initial image or a plurality of initial images if no pattern could be successfully recognized by the processing unit in the first image alone.
- the first image in which a pattern in the surface structure was recognized by the processing unit can be used as a reference image for determining the changing image sizes, such as contrast, image sharpness or scaling. This results in the advantage that any objects that can be detected optically can be used as input devices.
- the computing unit can be set up to recognize a pattern from any surface structure and to determine a movement vector of the input device based on the change in the pattern.
- a determination of the motion vector a evaluating a change in image sharpness and/or contrast and/or scaling of the pattern and/or a part of the surface structure of the input object that is visible to the recording device in the images of the image sequence.
- the computing unit can take into account a change in the pattern in the respective images of the image sequence when calculating the motion vector.
- the image sizes can be a change in the contrast and/or a change in the image sharpness and/or the scaling of the pattern in an image in the image sequence compared to the previous image in the image sequence and/or to the reference image.
- the processing unit can determine a movement from a change in the part of the surface structure visible to the recording device for the respective image in the image sequence compared to the previous image in the image sequence and/or to the reference image.
- the recording device can detect a change in contrast when the finger is raised and from this can determine a movement vector of the finger in addition to or as an alternative to the corresponding change in the pattern, such as a fingerprint.
- the processing unit can use the change in the image values of the fingerprint recognized by the processing unit to store the movement vector of the finger as a pattern in the respective Calculate images and/or the change in the visible part of the surface structure during the erection movement.
- the change in pattern that occurs when the finger is raised and/or the part of the surface structure visible to the recording device can be determined by the computing unit by changing the image sizes of the respective images of the visible part of the surface structure, including the contrast and/or the image sharpness and/or the scaling.
- the processing unit can determine a motion vector of the input object from the change in the respective image size or a combination of the image sizes of the respective images in the image sequence.
- the computing unit can determine a movement in the direction of the degrees of freedom with regard to the rotation about the axes of the respective three-dimensional coordinate system. Likewise, by using the change in said image values in combination, a redundant determination of the respective 3D input by the input object can take place.
- a movement vector can be determined by the processing unit.
- the display function of the display device is controlled only after a stored, authorized pattern of the surface structure of the input object has been recognized in an image from the image sequence.
- the control of the display function can only be triggered after the arithmetic unit has recognized a specific, stored and authorized pattern. For example, after a fingerprint has been recognized, which was previously stored in a memory of the computing unit as an authorizing fingerprint, the controlling of the display function by the computing unit can be authorized. Therefore, for example, only a user with his specific fingerprint can control a display function of the display device.
- At least one display function is assigned to at least one pattern of the input object.
- a specific display function can be assigned to a specific previously stored pattern. For example, a function of painting or drawing can be triggered by means of the fingerprint of the index finger and a function of virtual erasing when the fingerprint of the little finger is recognized.
- the 3D input can also be extended by the input object with an additional parameter.
- the respective image of the image sequence is captured in combination with a pressure sensor on the screen surface, the pressure sensor measuring a pressure of an input by the input object and the respective image of the image sequence is captured when the pressure exceeds a threshold value is triggered or at least one announcement function is assigned to a value of the measured pressure.
- the touch screen of the display device can include a pressure sensor, which can measure a pressure and/or a pressure centroid. If an input is made using the input object on the screen surface, the input can be combined with a print. For example, a display function can be triggered when the input pressure measured by the pressure sensor is exceeded.
- a display function can also be connected to a pressure value and assigned to it. For example, if the pressure of the input exceeds a first threshold, a thin line may be drawn, and if the pressure exceeds a second threshold, which is greater than the first threshold, a bold line different from the thin line may be drawn. This results in the advantage that an expanded range of display functions can be assigned by combining 3D input with a print.
- a display function can also be assigned to an optical marker.
- the pattern of the input object comprises at least one optical marker comprising at least one pattern for controlling a display function in each case.
- an input pen for operating a tablet computer can be used as an input object, for example.
- the pen can include a marker, which can be designed as a QR code, for example. If a specific QR code is recognized on the screen surface by the processing unit of the recording device, an erasing function can be triggered by the QR code, for example. Likewise, an erasing function can be assigned as a display function to a first QR code, drawing thin lines can be assigned to a second QR code, and drawing bold lines can be assigned to a third QR code.
- a QR code can also be used to assign a change to a vehicle-specific parameter. For example, a change in air conditioner temperature can be associated with a specific QR code.
- the optical markers can also be used for anatomical features of a body object, such as a fingerprint of a specific finger, such as that of a middle finger.
- a fingerprint of a specific finger such as that of a middle finger.
- an air conditioning system temperature can only be set using the fingerprint of the middle finger and a navigation function can be operated using the fingerprint of an index finger. This results in the advantage that a display function can also be expanded by specific optical markers of the input object.
- One embodiment provides a computing unit which is set up to carry out the method described above for detecting a movement of an input object relative to a display device.
- One embodiment provides a recording device with a computing unit that is set up to carry out the method described above.
- a further embodiment also provides a display device with said recording device and the computing unit.
- the display device can be a touch screen of a mobile device, such as a smartphone, a tablet or a computer, or a touch screen of a motor vehicle.
- One embodiment provides a motor vehicle with the computing unit or the receiving device and the computing unit.
- the invention also includes the combinations and features of the described embodiments.
- the invention also includes the control device for the motor vehicle.
- the control device can have a data processing device or a processor device that is set up to carry out an embodiment of the method according to the invention.
- the processor device can have at least one microprocessor and/or at least one microcontroller and/or at least one FPGA (Field Programmable Gate Array) and/or at least one DSP (Digital Signal Processor).
- the processor device can have program code which is set up to carry out the embodiment of the method according to the invention when executed by the processor device.
- the program code can be stored in a data memory of the processor device.
- the invention also includes developments of the method according to the invention, which have features as have already been described in connection with the developments of the motor vehicle according to the invention. For this reason, the corresponding developments of the method according to the invention are not described again here.
- the motor vehicle according to the invention is preferably designed as a motor vehicle, in particular as a passenger car or truck, or as a passenger bus or motorcycle.
- the invention also includes the combinations of features of the described embodiments.
- FIG. 2 shows a schematic representation of the method for controlling the display function of the display device
- FIG 3 shows a perspective of the recording device onto the input object from a side of the screen surface facing away from the user
- the exemplary embodiment explained below is a preferred embodiment of the invention.
- the described components of the embodiment each represent individual features of the invention to be considered independently of one another, which also develop the invention independently of one another and are therefore also to be regarded as part of the invention individually or in a combination other than that shown.
- the embodiment described can also be supplemented by further features of the invention already described.
- the same reference symbols designate elements with the same function.
- the display device 1 shows a side view of the display device 1 .
- the display device 1 has a touch screen with a screen surface 2 facing the user and a screen surface 2' remote from the user.
- the display device 1 can be a touch screen, for example.
- the display device 1 has two optical carrier media 21 and 23, the optical carrier medium 21 being the user-side carrier medium and the carrier medium 23 being the carrier medium remote from the user.
- a holographic-optical layer 22 is located between the carrier media 21 and 23.
- the display device 1 further includes a detection area 13 and a recording device 3 consisting of a recording area 32, a camera device 31 and a computing unit 5.
- the detection area 13 can be, for example, a screen area on which touch inputs can be made by the user.
- the recording device is designed in such a way that the camera device of the recording device takes a picture of the user-facing side of the screen surface 2 at a previously set time interval.
- one image 4 of the image sequence 14 is processed in the processing unit.
- the image sequence 14 consists of an initial image 4' as a first image of the image sequence and at least one image 4 following the initial image.
- the recording device 3 records an image of the surface structure 7 of the input object 6 which is located in the input area 13 of the recording device 3 in the focus 15 above or on the screen surface 2 .
- the input object 6 is a user's finger here.
- the user's finger has a surface structure 7 , such as the side of the input object 6 facing the screen surface 2 , and a fingerprint as a pattern 11 in the surface structure 7 .
- a Cartesian coordinate system is located next to the recording device 3 for orientation, the x-axis being in the longitudinal direction of the display device 1 , the y-axis being in the transverse direction of the display device 1 and the z-axis being vertical to the display device 1 .
- a longitudinal axis 17 and a transverse axis 18 are drawn in the input object 6 to describe the movement of the input object 6 .
- the longitudinal axis 17 moves parallel to the x-axis of the Cartesian coordinate system and the transverse axis 18 parallel to the y-axis.
- the recording device 3 is set up in relation to the display device 1 in such a way that it records an image of the user-facing side of the screen surface 2 by means of the holographic-optical layer from the perspective of a camera device arranged on the user-facing side of the screen surface 2'.
- this is shown as a holographic-optical detection device.
- An image of the surface structure 7 of the input object 6 is shown over the detection area 13 and the light 28 is refracted by means of the image of the input object 6 through the holographic-optical layer 22 by means of a respective grating structure in the detection area 13 and in the recording area 32 of the recording device 3 and through the carrier medium 21 and 23 are each conducted to the camera device 31 of the recording device 3 by internal reflection.
- the holographic-optical layer breaks the light 28 and directs it from the carrier medium 23 into the camera device 31 of the recording device 3.
- the camera device 31 is now set up to continuously record an image 4 of an image sequence 14 of the detection region 13 at least at a specific time interval.
- the camera device 31 views the input area 13 via the carrier media 21 and 23 analogously to the manner of a periscope, with which one can see the user-facing side of the screen surface from below.
- the field of view in the camera device 31 is the entire detection area 13, which can be a screen surface 2 of an operating area of the display device 1, for example.
- the Detection area 13 can also be a drawing area, such as a touchpad.
- the camera device 31 is now designed to record an image 4 of an image sequence 14 at least at a predetermined time interval.
- the respective images 4' and 4 of the image sequence 14 of the camera device 31 are evaluated by the processing unit 5 and an initial image 4' and/or an image 4 is stored. If the computing unit 5 of the recording device 3 detects a surface structure in the area of the focus 15 in an initial image 4' of the camera device 31, then the first image 4, in which the surface structure 7 of the input object 6 is detected, is the initial image 4' of the image sequence 14
- the camera device 31 recognizes the surface structure 7 by first placing the input object 6, i.e. the finger, on the user-facing screen surface 2 in the input area 13.
- the processing unit 5 searches the initial image 4' for a pattern 11 in the surface structure 7.
- the fingerprint of the finger can be recognized by the processing unit 5 as the pattern 11 and the initial image 4' with the recognized fingerprint can be stored as a reference image.
- the pattern 11 in the initial image 4' can now be used to align and position the input object 6 in the input area 13, for example whether the finger is positioned at the bottom right or at the top left in the input area.
- a change in the pattern 11 is determined by the computing unit 5 with respect to the initial image 4 ′ and/or with respect to an image 4 preceding an image 4 in the image sequence 14 .
- the arithmetic unit 5 can determine a movement vector of the input object 6 from the difference in alignment and position when the input object 6 moves in the respective images 4 of the image sequence 14 .
- the motion vector 16 can be a tilting motion, for example, which corresponds to a rotation of the input object 6 about the y-axis, and therefore about its transverse axis 18 .
- the lower Half 11' of the pattern 11 in the image 4 is perceived in comparison to the initial image 4', from which the processing unit 5 can determine that a tilting movement of the input object 6 analogous to the movement vector 16 is present.
- the disappearance of the lower half 11' of the pattern 11 can be recorded over a number of images 4 of the image sequence 14.
- the processing unit 5 can determine a motion vector 16 of the input object 6 from the change in the pattern 11 in the respective images 4 of the image sequence 14 .
- the processing unit 5 can calculate a movement vector 16 of the input object 6 by changing the contrast and/or the image sharpness of that part of the surface structure of the finger that is visible to the recording device in the images 4 in comparison to the reference image and/or to an image 4 in Determine the picture 4 preceding the picture sequence.
- the recording device 3 can detect a change in contrast in the lower half 1T of the pattern 11 in image 4 compared to the initial image 4' when the finger is raised and can determine the movement vector 16 of the finger from this.
- the processing unit 5 can change the sharpness of the image and/or the scaling of the pattern 11 in image 4 in comparison to the initial image 4' and/or to one of the image 4 in use the image 4 preceding the image sequence to determine the motion vector 16 .
- the processing unit 5 can determine a motion vector 16 of the input object 6 from the change in the respective image size or a combination of the image sizes of the respective images 4 of the image sequence 14 .
- Fig. 2 the method for controlling the display function is shown step by step.
- images 4' and 4 of an image sequence 14 are recorded by the recording device 3 on the user-facing side of the screen surface 2 of the display device 1.
- a surface structure 7 of the input object 6 is recognized in a focus 15 on the user-facing side of the screen surface 2 of the recording device 3. This can be used, for example, by recognizing an outline of the surface structure 7 or a threshold value for a drop in contrast of the part of the surface structure 7 visible to the recording device 3 in an image 4 of the image sequence 14 as a trigger for the recognition of a user input by the processing unit 5.
- the processing unit 5 looks for a pattern 11 in the surface structure 7 in the first image 4 of the image sequence 14, the so-called initial image 4' Pattern 11 recognized in the surface structure 7, the search for the pattern 11 can be continued in the next image 4 up to a suitable maximum number of images 4.
- the initial image 4' is stored by the processing unit 5 as a reference image.
- step S2 If in the second step S2 the computing unit 5 does not recognize a pattern 11 in the surface structure 7 or no suitable surface structure 7, for example if the change in contrast of the visible part of the surface structure 7 falls below a threshold value, then the computing unit 5 goes back to step S1. However, if the processing unit 5 recognizes a pattern 11 in the surface structure 7 or the visible part of the surface structure 7 exceeds a threshold value for a contrast change, then the method continues in the third step S3.
- An orientation 8 and/or a position 9 of the input object 6 in the input area 13 is now determined for the pattern 11 by the computing unit 5 in step S3. For example, this can initially be a specific position in the input area 13 on the screen surface 2 facing the user.
- further images 4 of surface structure 7 are now recorded by recording device 3 , which are compared by processing unit 5 with initial image 4 ′ and/or with an image 4 preceding image 4 in image sequence 14 .
- From the difference in the pattern 11 and/or the difference in the image values, such as A motion vector 16 of the input object 6 is determined by the computing unit 5 based on the contrast, image sharpness and/or scaling of the pattern and/or the visible part of the surface structure 7 of the respective images 4 and 4′.
- a display function of the display device 1 is now controlled from the calculated motion vector 16 .
- the movement vector 16 represents a tilting movement, i.e. if, for example, the finger is placed with the fingertip on the screen surface of the display device 1 and the hand is now tilted against the display surface
- a setting for a drawing can be changed that, for example, draws from changed from an initially thin line to a bold line.
- FIG. 3 now shows a view of the screen surface 2 from the perspective of the camera device 31 of the recording device 3, the camera device 31 seeing the side of the screen surface 2 facing the user from the perspective of the side of the screen surface 2' facing away from the user.
- the screen surface 2, the input object 6 with the surface structure 7 and the pattern 11 can now be seen.
- the Cartesian coordinate system, which has been rotated accordingly is also shown.
- the camera device 31 looks from below through a display of the display device 1 at the finger as the input object 6.
- the longitudinal axis 17 and the transverse axis 18 of the input object 6 are also shown.
- a motion vector 16 of the input object 6 can be determined by the computing unit 5 from a change in the pattern 11 of the surface structure 7 .
- the camera device 31 of the recording device 3 records an initial image 4' of the surface structure 7 and searches it for a pattern 11.
- a value for an image sharpness, a scaling, a contrast and the part of the surface structure 7 that is visible to the recording device is stored for the initial image 4' as a reference image. This can for example be the outline of finger 6 in picture a).
- the image values are recorded by the camera device 31 for each pixel of the initial image 4'.
- image a a rolling movement of the input object 6 is carried out.
- the finger rotates around the z-axis. If the input object 6 is now rotated about the z-axis, there is no change in contrast and image sharpness, since the finger as the input object 6 is in the same focus 15 of the camera device 31, i.e. not removed from a plane parallel to the screen surface 2 . Likewise, the scaling of the pattern 11 and the visible part 6' of the surface structure 7, here the outline of the finger, does not change. In this case, the computing unit 5 can recognize whether the input object 6 remains in the same plane with respect to the screen surface.
- the processing unit 5 can rotate the input object 6 in an image 4 compared to the initial image 4 ' detect.
- image a the texture of the input object 6 is rotated clockwise. There is no scaling or contrast change.
- the fingertip rotates around its vertical axis z.
- image b a tilting movement of the input object 6, and therefore a rotation around the y-axis, is now to be shown.
- the surface structure 7 can now be recognized as a fingertip, which has the pattern 11 as a fingerprint.
- the hand 19 for orientation may or may not actually be visible to the camera device 31 .
- the camera device 31 now records the view shown in image b) as an image 4 and can calculate a difference from the initial image 4'.
- the processing unit 5 can detect a change in the pattern 11 and in the part of the surface structure 7 that is visible to the camera device 31 .
- the computing unit 5 can recognize that said part of the surface structure 7' is moving away from a plane parallel to the screen surface 2.
- the computing unit 5 can determine a motion vector 16 which indicates a tilting motion.
- Image c) now shows a tilting movement of the input object 6, and therefore a rotation of the input object 6 about the x-axis.
- the computing unit 5 can determine a movement vector 16 for a tilting movement from the respective direction of the change in the contrast of the pattern 11 and additionally the visible part 6' of the surface structure 7.
- the surface structure 7 is transformed linearly, but offset by 90° with respect to image b).
- the fingertip rotates around its longitudinal axis 17.
- the computing unit 5 can now infer a rotational movement of the input object 6 .
- a position of the input object 6 to the input area 13 can be determined.
- Translational movements can be determined from the change in position. This also makes it possible to combine the rotary and the translatory movement with one another, for example when the finger as the input object 6 is rolled over the screen surface in the same way as a roller that rolls across the display.
- the change in the visible part 6' of the surface structure 7, the image sharpness and the contrast takes place together with a change in the position of the visible part 6' of the surface structure 7.
- FIG. 1 Application forms for controlling a display function based on the determined motion vector 16 are now shown in FIG.
- a sequence of movements in images a), b) and c) is shown in FIG.
- image a a user performs a rotational movement on the screen surface 2 with the finger as the input object 6 .
- the finger therefore rotates about its longitudinal axis 17 or transverse axis.
- drawing with a bold line analogous to a text marker 25 with a tip 24 can be shown in image a) below as a display function.
- drawing with a bold line can be analogous to holding a highlighter at the same angle 27 as a display function to be executed.
- a rotation of the finger as the input object 6 about the longitudinal axis 17 can also be represented by a rotation of the virtual highlighter 25 at the same angle 27 with respect to the screen surface 2 . To do this, the tip rotates in the same way as angle 27.
- the display function can now draw a provide a thin line, analogous to viewing the tip 24 of the virtual highlighter 25 with respect to the screen surface 2. If the finger as the input object 6 is rotated with respect to the longitudinal axis 17, this can rotate the highlighter 25 with respect to the screen surface 2.
- the room is recorded directly via the screen using a recording device behind the display (holocam, pixels in the display, camera behind a transparent display) with or without touch functionality.
- the focus should be as close as possible to the screen surface and enable the recognition of relevant textures and higher contrast.
- the consecutively recorded images are searched for recognizable image content (textures, fingerprints, markers, image sharpness).
- This image content is now analyzed image by image, whereby the movement of the pixels, as well as the distortion and the contrasts can be used to estimate the type and direction of movement.
- the backlighting of the display in the case of an OLED display, the display itself or specially installed IR pixels (infrared) can be used to illuminate the object.
- the system can be expanded with special optical markers (e.g. QR code - fixed to the input object, can be stuck on or displayed on a display), to which special properties can be assigned. For example an erasing function, a color change.
- the markers can also be invisible, for example via IR.
- the position is detected via the recorded image or in combination with a touch sensor (pressure, resistive, capacitive, inductive, IR, ultrasonic).
- the subject from DE 10 2011 084 809 A1 uses a method for computer-assisted control of a user interface using a high-resolution camera, touching the touch screen with an object or a hand, with a barcode on the underside of the object being used for control.
- the idea uses object features such as fingerprints, skin texture or surface structure.
- the system is not limited to any special input media.
- the idea relates to a method for controlling a display function of a display device using any input object via a touch screen.
- a camera device of a recording device creates an image sequence from the user-facing screen surface of the display device.
- a computing unit of the recording device tracks when the input object is tilted, inclined or rolled with respect to the screen surface.
- the processing unit searches for a pattern comprising a depth profile in the surface structure of the input object and evaluates a change in the image values for contrast, image sharpness of the pattern or additionally or alternatively the visible part of the surface structure in the image sequence. From the change in the pattern or in the part of the surface structure that is visible to the camera device, the processor determines a motion vector of the input object for controlling a display function.
- the example shows how a method for detecting a movement of an input object relative to a display device via optical features can be provided.
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- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
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- Health & Medical Sciences (AREA)
- Computer Vision & Pattern Recognition (AREA)
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Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020122969.0A DE102020122969B4 (de) | 2020-09-02 | 2020-09-02 | Verfahren zur Erkennung einer Bewegung eines Eingabegegenstands gegenüber einer Anzeigevorrichtung über optische Merkmale, Aufnahmevorrichtung mit Recheneinheit, Anzeigevorrichtung und Kraftfahrzeug |
| PCT/EP2021/072344 WO2022048869A1 (de) | 2020-09-02 | 2021-08-11 | Verfahren zur erkennung einer bewegung eines eingabegegenstands gegenüber einer anzeigevorrichtung über optische merkmale, aufnahmevorrichtung mit recheneinheit, anzeigevorrichtung und kraftfahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4208771A1 true EP4208771A1 (de) | 2023-07-12 |
Family
ID=77431305
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21758377.2A Withdrawn EP4208771A1 (de) | 2020-09-02 | 2021-08-11 | Verfahren zur erkennung einer bewegung eines eingabegegenstands gegenüber einer anzeigevorrichtung über optische merkmale, aufnahmevorrichtung mit recheneinheit, anzeigevorrichtung und kraftfahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230367428A1 (de) |
| EP (1) | EP4208771A1 (de) |
| CN (1) | CN116113994A (de) |
| DE (1) | DE102020122969B4 (de) |
| WO (1) | WO2022048869A1 (de) |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8604364B2 (en) * | 2008-08-15 | 2013-12-10 | Lester F. Ludwig | Sensors, algorithms and applications for a high dimensional touchpad |
| US20110285648A1 (en) * | 2010-01-22 | 2011-11-24 | Lester Ludwig | Use of fingerprint scanning sensor data to detect finger roll and pitch angles |
| DE102011084809A1 (de) | 2011-10-19 | 2013-04-25 | Siemens Aktiengesellschaft | Benutzerschnittstelle und Verfahren zur rechnergestützten Ansteuerung einer Benutzerschnittstelle |
| US9886116B2 (en) | 2012-07-26 | 2018-02-06 | Apple Inc. | Gesture and touch input detection through force sensing |
| JP2018049391A (ja) | 2016-09-20 | 2018-03-29 | 富士通株式会社 | 生体画像処理装置、生体画像処理方法、および生体画像処理プログラム |
| KR20180094323A (ko) | 2017-02-15 | 2018-08-23 | 삼성전자주식회사 | 인터랙션을 수행하는 방법 및 이를 사용하는 전자 장치 |
| DE102017004860A1 (de) | 2017-05-19 | 2018-11-22 | Daimler Ag | Handschrifterkennung in einem Fahrzeug |
| US10216975B1 (en) * | 2018-02-23 | 2019-02-26 | Shenzhen GOODIX Technology Co., Ltd. | Optical imaging via imaging lens and imaging pinhole in under-screen optical sensor module for on-screen fingerprint sensing in devices having organic light emitting diode (OLED) screens or other screens |
| DE102018122896A1 (de) * | 2018-09-18 | 2020-03-19 | JENETRIC GmbH | Verfahren und Vorrichtung zur Kontrolle eines mobilen Eingabegeräts |
| US11216641B2 (en) | 2019-01-22 | 2022-01-04 | Invensense, Inc. | Latent fingerprint detection |
-
2020
- 2020-09-02 DE DE102020122969.0A patent/DE102020122969B4/de active Active
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2021
- 2021-08-11 US US18/043,739 patent/US20230367428A1/en active Pending
- 2021-08-11 EP EP21758377.2A patent/EP4208771A1/de not_active Withdrawn
- 2021-08-11 WO PCT/EP2021/072344 patent/WO2022048869A1/de not_active Ceased
- 2021-08-11 CN CN202180053912.3A patent/CN116113994A/zh not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| CN116113994A (zh) | 2023-05-12 |
| DE102020122969A1 (de) | 2022-03-03 |
| US20230367428A1 (en) | 2023-11-16 |
| DE102020122969B4 (de) | 2023-05-04 |
| WO2022048869A1 (de) | 2022-03-10 |
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