EP2638457A1 - Method for detecting an object of interest in a disrupted environment, and gesture interface device implementing said method - Google Patents
Method for detecting an object of interest in a disrupted environment, and gesture interface device implementing said methodInfo
- Publication number
- EP2638457A1 EP2638457A1 EP11817321.0A EP11817321A EP2638457A1 EP 2638457 A1 EP2638457 A1 EP 2638457A1 EP 11817321 A EP11817321 A EP 11817321A EP 2638457 A1 EP2638457 A1 EP 2638457A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- interest
- capacity
- objects
- environment
- measuring
- 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- Withdrawn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; CALCULATING OR 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04182—Filtering of noise external to the device and not generated by digitiser components
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
Definitions
- the present invention relates to a method for detecting objects of interest in a disturbed environment, applicable to gestural interfaces. It also relates to a gestural interface device implementing the method.
- the field of the invention is more particularly but in a non-limiting manner that of the tactile and capacitive 3D surfaces used for the human-machine interface controls.
- a touch control interface such as a pad or screen.
- Examples include mobile phones, smartphones, touch screen computers, pads, PCs, mice, touch screens, giant screens
- the touch surface is equipped with conductive electrodes connected to electronic means which make it possible to measure the variation of the capacitances appearing between electrodes and the object to be detected in order to carry out a command.
- Capacitive techniques currently implemented in touch interfaces most often use two layers of conductive electrodes in the form of lines and columns. Electronics measure the coupling capabilities that exist between these lines and columns. When a finger is very close to the active surface, the coupling capabilities near the finger are modified and the electronics can thus locate the position in 2D (XY), in the plane of the active surface.
- Rozière's FR 2844 349 discloses a capacitive proximity sensor comprising a plurality of independent electrodes, which makes it possible to measure the capacitance and the distance between the electrodes and an object in the vicinity.
- any displacement of a parasitic object at this distance can also be interpreted as the presence of the object to be detected, and trigger an unwanted unwanted order.
- the change in the environment is even more important for all portable devices such as mobile phones, notebooks, laptops ....
- Another example is the touchscreen and capacitive touchscreen of laptops. Adjusting the tilt of the screen moves the sensitive surface closer to or away from the keyboard screen. This variation of approximation or remoteness can be interpreted as the approach or the distance of the hand to be detected.
- the surface of the keyboard being very important, the sensitivity of the capacitive electrodes of the screen can change according to the distance separating them from the keyboard. Indeed, the sensitivity of the capacitive electrodes depends on their surface but also the edge effects that can deflect or disturb the electrostatic field lines of the electrodes concerned.
- the presence of an inert object such as an object on the desktop near the capacitive slab of a gesture interface can also significantly change the response of the slab.
- the inert object can also be the support of the capacitive slab such as an office. This support may for example comprise more or less thick wood, or any other dielectric material or conductor of electricity. These materials can alter the leakage capabilities due to edge effects.
- the change of position on a desk can also change the leakage capacity due for example to the presence of feet under the desk, consisting of a dielectric surface ...
- Another example is the use of a gesture control in a vehicle where the change in the environment can be the movement of the gearshift lever, the parking brake, the presence of a passenger, the adjustment of the seat
- the object of the present invention is to provide a gesture interface control method and device for correcting the disturbing effects of the environment and improving the detection of commands.
- This objective is achieved with a method of detecting object (s) of interest moving in an environment, implementing at least one measuring electrode in capacitive coupling with the said object (s) d interest and with one or more other objects - said perturbation - present in this environment, characterized in that it comprises, for at least one of said measuring electrodes, steps of:
- the method according to the invention may further comprise a step of updating the measurement history, such that said measurement history comprises total capacities measured during a period corresponding to a sliding time window with respect to the instant of measurement. measure, of predetermined duration.
- the duration of the sliding time window can be determined to be greater than an average duration of presence of the objects of interest close to the measurement electrode;
- the duration of the sliding time window can be between one and ten seconds.
- any other duration value of the sliding time window can also be used depending on the type of environment. This duration can be less than one second for very dynamic, or on the contrary of the order of several tens of seconds to several minutes for a very static environment.
- the method according to the invention may further comprise a step of adjusting the duration of the sliding time window as a function of the dynamics of variation of the measurements.
- the method according to the invention may further comprise steps of:
- the determination of a minimum value in the measurement history may comprise the use of an optimal minimum / maximum filtering algorithm, with a substantially constant calculation time;
- the calculation of the interest capacity may comprise the calculation of a combination of the leakage capacity and the total capacity measured. This combination can be a linear combination.
- the method according to the invention may furthermore comprise:
- a preliminary calibration step comprising, for at least one measuring electrode, the determination of an initial leakage capacitance by measuring the total capacitance of the measuring electrode in the absence of an object of interest,
- this initial leakage capacity to the leakage capacities determined subsequently, this combination possibly being a linear combination.
- the method according to the invention can be implemented for a plurality of measuring electrodes differently according to said electrodes.
- a gestural interface device implementing the method of detecting objects of interest in a disturbed environment according to any one of the preceding claims, said gestural interface being made from objects of interest driven by gesture in said environment further comprising disturbance objects, said device comprising at least one measuring electrode capable of detecting objects by capacitive coupling between said measuring electrode and said objects, characterized in that it further comprises, for at least one measurement electrode:
- means for calculating a leakage capacity due to the perturbation objects comprising means for determining a minimum value in a history of total capacity measurements previously stored,
- the device may further comprise a substantially flat surface comprising a plurality of measuring electrodes
- the measurement electrodes may comprise a material that is substantially transparent to light.
- a system of one of the following categories is proposed: telephone, computer, computer peripheral, display screen, dashboard, control panel, implementing a capacitive detection method according to the invention. 'invention.
- a system of one of the following categories telephone, computer, computer peripheral, display screen, dashboard, control panel, comprising a gesture interface device according to the 'invention.
- FIG. 1 illustrates the influence of the environment on a gesture control device of the touch screen type
- FIG. 2 illustrates the capacity measurement with the method according to the invention
- - Figure 3 shows an enlarged view of Figure 2 for displaying the calculated leakage capacity with the method according to the invention.
- FIG. 1 shows an embodiment of a gesture control interface device according to the invention integrated in a touch screen, computer or telephone (smartphone).
- the interface device 1 comprises a plurality of capacitive electrodes 2 arranged so as to substantially line its surface. For the sake of clarity, only a capacitive electrode 2 is shown in FIG. 1.
- the capacitive electrodes 2 and their control electronics are produced according to an embodiment described in FR 2 844 349.
- the control electronics comprise means for exciting the electrodes 2 at an alternating voltage and very high sensitivity capacitance measuring means based on a floating bridge electronics.
- the electrodes 2 are interrogated sequentially via a scanner.
- the electronics are designed in such a way as to almost perfectly eliminate the capacitive couplings between the electrodes 2, or between the electrodes 2 and the parts of the interface device 1 subjected to another electrical potential.
- the capacitance measured by each electrode 2 is close to zero, with edge effects and imperfection near the sensitive surface and the electronic.
- These low residual capacities are called Coo.
- These residual capacitors can also be low-value capacitors which correspond to the effect of the object of interest 3 when its distance is considered to be out of range of the measurement electrodes 2 or beyond a maximum detection distance. .
- the residual capacities Coo can also be due to the presence of objects 4 in the vicinity of the interface device 1.
- the leakage capacitors 6 are set up, of which the order of magnitude can be comparable to that of the capacity 5 due to the object of interest 3, and which can therefore cause significant measurement errors.
- An object of the present invention is precisely a method making it possible to discriminate the variations of the environment 4 from the presence of the object to be detected 3 in such a way as to improve its detection and thus avoid false commands.
- the correction is based on the exploitation of certain specific aspects of the environment, which comprises, for example, static objects 4 placed side by side in the vicinity of the capacitive interface device 1:
- the capacity of the electrode 2 of FIG. 1 increases with the presence of an object of interest 3 or of environment 4.
- the capacitance measured by the electrode 2 is:
- a typical object of interest such as a finger or a hand has relatively fast movements relative to the objects considered to belong to the environment.
- the solution consists in estimating in real time - or at least in a manner that is evolutionary in time - a Coo leakage capacity map in order to correct the estimation of the position of the control object 3.
- Coo leakage capacity for a given electrode 2, taking into account environment objects 4 can be expressed as follows:
- This estimate is updated continuously to take into account the changes in the environment, for example in case of displacement of the interface device 1 or the appearance of new objects 4 nearby.
- a method will be described for estimating the Coo map dynamically during the use of the interface device 1.
- the curve 10 shows a total capacitance measurement Ctot for an electrode 2 of the interface device 1.
- the peaks 12 correspond to the instants at which an object of interest 3 approaches the electrode 2.
- the curve 10 is representative of the situation according to which for example a finger 3 approaches and comes periodically near or in contact with the surface of the interface device 1, to "click" or operate virtual keys.
- the electrode 2 measures a total capacitance C whose contribution due to the object Cobj corresponds to the height 14 of the peaks 12.
- a time window 13 is chosen whose width or temporal duration Tm is substantially greater than the duration during which the object of interest 3 can remain motionless, but smaller than the period over which the environment can change.
- the temporal duration Tm must notably be greater than the typical duration of a gesture (movement of the object of interest 3) so as to be able to discriminate the variations of capacity due to a change of the object of interest. and that due to other objects 4 considered as belonging to the environment.
- the time window 13 is represented in FIGS. 2 and 3 with respect to a measurement instant (or present moment) 15.
- the value of the leakage capacity Coo at the present moment is determined as being the smallest capacitance value C stored during this time window 13.
- the window 13 is slippery in time, in the sense that the stored values are updated periodically (at each acquisition for example) to keep only a measurement history of duration Tm.
- the capacitance C (t) of each electrode 2 is measured periodically with a temporal sampling At allowing the detection of gestures.
- the last N capacity measurements measured are stored in a zone digital storage device, and used to estimate Coo leakage capability.
- the oldest of the N stored measurements is erased while the last measurement is stored.
- min ⁇ is the search operator of the minimum, and s belongs to the time interval [t-Tm, t].
- the leakage capacity of the environment can be written as:
- This minimum filtering has an adaptive behavior that is not symmetrical with respect to changes in the environment:
- the filter waits" for this increase to last at least throughout the duration Tm of the sliding window 13 before raising the value of the leakage capacity Coo according to equations 3 or 4.
- Curve 11 shows the evolution of leakage capacity Coo, as calculated by equation 4.
- the choice of the width of the time window Tm depends on the type of device to be controlled and its mode of use.
- the controls are relatively dynamic.
- the slowest commands are for example the selection of an icon on the screen to move or delete it.
- the action consists in fixing the finger for at least 1 second to make the selection of the icon.
- a time window of 2 to 10 seconds, or even 1 to 10 seconds, is appropriate for this type of device to retain the ability to select an icon while integrating environmental correction.
- This corrected capacity of environmental effects can then be used in a conventional manner to detect the position or gesture of the object of interest 3.
- the calculation of the minimum in the last sub-window, during filling can be carried out either by re-traversing at each iteration (corresponding to a capacitance measurement acquisition C) the values of the sub-window already stored, either in keeping the smallest value in each iteration.
- the storage area requires a dimension M (and no longer N).
- the temporal width Tm of the window 13 can be adapted according to the type of environment autonomously by using a specific algorithm taking into account the evolution of this environment from the measurements. It can also be adapted manually;
- the calculation of the Cobj capacity of interest may comprise a linear combination of the total capacities C and Coo leakage, or any other function of C and Cco.
- the estimation of the Coo capacitance with the minimum filtering as described in equation (4) can be combined with another previously determined and memorized leak capacitance calibration card Coo ', resulting for example from a factory calibration.
- This combination can be a linear combination, with a gain and offset factor, or any other combination. This makes it possible to avoid abrupt variations in the sensitivity of the capacitive detection;
- the method can be implemented in a similar or different manner for the different electrodes 2 of the interface device 1.
- it can be implemented in a different manner for the electrodes located at the periphery of the sensitive surface of the device 1, which are naturally more sensitive to changes in the environment.
- a faster correction, with a window 13 of shorter time width Tm, can be applied to these electrodes;
- the invention can be implemented with any type of capacitive measurement electronics making it possible to limit capacitive leakage.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- User Interface Of Digital Computer (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1059203A FR2967278B1 (en) | 2010-11-08 | 2010-11-08 | METHOD FOR DETECTING AN OBJECT OF INTEREST IN A DISTURBED ENVIRONMENT, AND GESTUAL INTERFACE DEVICE USING THE SAME |
PCT/FR2011/052533 WO2012062983A1 (en) | 2010-11-08 | 2011-10-28 | Method for detecting an object of interest in a disrupted environment, and gesture interface device implementing said method |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2638457A1 true EP2638457A1 (en) | 2013-09-18 |
Family
ID=44170315
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11817321.0A Withdrawn EP2638457A1 (en) | 2010-11-08 | 2011-10-28 | Method for detecting an object of interest in a disrupted environment, and gesture interface device implementing said method |
Country Status (7)
Country | Link |
---|---|
US (1) | US20140146006A1 (en) |
EP (1) | EP2638457A1 (en) |
JP (1) | JP6008862B2 (en) |
KR (1) | KR101911107B1 (en) |
CN (1) | CN103270478B (en) |
FR (1) | FR2967278B1 (en) |
WO (1) | WO2012062983A1 (en) |
Families Citing this family (7)
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US9323398B2 (en) | 2009-07-10 | 2016-04-26 | Apple Inc. | Touch and hover sensing |
US9098138B2 (en) | 2010-08-27 | 2015-08-04 | Apple Inc. | Concurrent signal detection for touch and hover sensing |
US9201547B2 (en) | 2012-04-30 | 2015-12-01 | Apple Inc. | Wide dynamic range capacitive sensing |
US9933879B2 (en) | 2013-11-25 | 2018-04-03 | Apple Inc. | Reconfigurable circuit topology for both self-capacitance and mutual capacitance sensing |
US10768746B1 (en) | 2016-05-10 | 2020-09-08 | Apple Inc. | Quasi-continuous-time sampling of discrete-time sampled signals |
CN107340855A (en) * | 2017-03-02 | 2017-11-10 | 北京理工大学 | A kind of vehicle mounted multimedia gestural control method based on electrostatic detection |
CN107562366A (en) * | 2017-09-28 | 2018-01-09 | 珠海普林芯驰科技有限公司 | Gesture identification method, computer installation and computer-readable recording medium |
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JP4794010B2 (en) * | 2008-01-16 | 2011-10-12 | 三菱自動車工業株式会社 | Touch sensor device, control method, touch panel device, and program |
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TWI401597B (en) * | 2009-02-25 | 2013-07-11 | Ite Tech Inc | Method and apparatus for drift compensation of capacitive touch panel |
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2010
- 2010-11-08 FR FR1059203A patent/FR2967278B1/en not_active Expired - Fee Related
-
2011
- 2011-10-28 US US13/883,377 patent/US20140146006A1/en not_active Abandoned
- 2011-10-28 JP JP2013538252A patent/JP6008862B2/en not_active Expired - Fee Related
- 2011-10-28 EP EP11817321.0A patent/EP2638457A1/en not_active Withdrawn
- 2011-10-28 KR KR1020137012639A patent/KR101911107B1/en active IP Right Grant
- 2011-10-28 CN CN201180053730.2A patent/CN103270478B/en not_active Expired - Fee Related
- 2011-10-28 WO PCT/FR2011/052533 patent/WO2012062983A1/en active Application Filing
Non-Patent Citations (2)
Title |
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None * |
See also references of WO2012062983A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012062983A1 (en) | 2012-05-18 |
KR20130132441A (en) | 2013-12-04 |
CN103270478B (en) | 2018-02-02 |
FR2967278A1 (en) | 2012-05-11 |
JP6008862B2 (en) | 2016-10-19 |
KR101911107B1 (en) | 2018-10-23 |
JP2013542538A (en) | 2013-11-21 |
CN103270478A (en) | 2013-08-28 |
FR2967278B1 (en) | 2013-06-28 |
US20140146006A1 (en) | 2014-05-29 |
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