JP2014222391A - Electronic apparatus, locus correction method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of preventing erroneous input in close input.SOLUTION: The electronic apparatus includes: a capacitance measuring unit for measuring capacitance distribution to be two-dimensional distribution of capacitance values on a display screen; a locus detection unit for determining locus coordinates at each time on the basis of a capacitance value at each time and detecting time series of locus coordinates as a locus; a disappearance length output unit which, when the locus coordinates are not detected and then are detected again, outputs disappearance point coordinates to be coordinates detected just before non-detection of the locus coordinates, re-detection point coordinates to be coordinates on which the locus coordinates are detected again and a disappearance length to be a distance between the two points; and a correction unit which, when the disappearance length is a predetermined threshold or less, compensates between the disappearance point coordinates and the re-detection point coordinates.

Description

  The present invention relates to an electronic device, a locus correction method, and a program.

  In recent years, in the technical field of electronic devices using touch panels, even when a user's finger is not touching the touch panel, the proximity of the finger to the touch panel can be detected, and the proximity of the finger can be regarded as an input operation to the touch panel. Equipment is known. For example, in Patent Document 1, when a touch panel having a first resistance film and a second resistance film is in contact with the first resistance film and the second resistance film, an input position for detecting an input position to the touch panel is detected. The detection unit, the proximity detection unit that detects the proximity of the user's finger to the touch panel based on the capacitance generated between the first resistance film and the second resistance film, and the ground, and the input position detection unit operate. A detection mode switching control unit that switches between a state in which the proximity detection unit is operating and a state in which the proximity detection unit is operating, and the first resistance film and the second resistance film when the proximity detection unit is in operation. An input device including a resistance film connecting portion that is electrically connected is disclosed. According to the input device of Patent Literature 1, the user can perform input without bringing a finger into contact with the touch panel.

  A capacitance distribution is known as a physical quantity used for detecting the proximity of a finger. For example, when the capacitance distribution on the touch panel surface is always measured and the maximum capacitance value at a certain time falls within a predetermined range, the coordinate at which the maximum value was observed was input at that time. Can be considered. The lower limit value of the predetermined range set here defines the limit of proximity detection. If the lower limit value is too large, the proximity detection judgment becomes too strict and smooth input operation cannot be performed, while if the lower limit value is too small, the proximity detection judgment becomes too sweet and incorrect input is made. It becomes a factor of. The act of increasing the lower limit means that the space (hereinafter referred to as the proximity detection space) in which the proximity of the finger can be detected above the touch panel (the front direction when the touch panel is viewed from the front) is limited to be low. On the other hand, the act of reducing the lower limit value means expanding the proximity detection space to be high.

JP 2010-231565 A

  The method of inputting only with the proximity of the finger with the finger in a non-contact state (hereinafter referred to as the proximity input method) is erroneous compared to the method of inputting with the finger in contact (hereinafter referred to as the contact input method). Is likely to occur. Accordingly, an object of the present invention is to provide an electronic device that can prevent erroneous input during proximity input.

  The electronic device of the present invention includes a capacitance measuring unit, a locus detecting unit, a correcting unit, and a display control unit.

  The capacitance measuring unit measures a capacitance distribution that is a two-dimensional distribution of capacitance values on the display screen. The locus detection unit determines locus coordinates at each time based on the capacitance value at each time, and detects a time series of locus coordinates as a locus. The correction unit corrects the trajectory under a predetermined condition.

  According to the electronic apparatus of the present invention, it is possible to prevent erroneous input during proximity input.

The contour map which showed the example of the electric field strength distribution of the capacitive touch panel with the solid line, the long broken line, and the one-dot chain line in order of the electric field strength. The figure which shows the example from which an operating finger escapes temporarily out of proximity detection space, and a locus | trajectory is interrupted. 1 is a block diagram illustrating a configuration of an electronic device according to a first embodiment of the invention. 6 is a flowchart showing the operation of the electronic apparatus according to the first embodiment of the invention. The figure which shows the example which a control finger | toe escapes out of proximity detection space in the apparatus edge vicinity, and a locus | trajectory is interrupted. FIG. 6 is a block diagram illustrating a configuration of an electronic device according to a second embodiment of the invention. 9 is a flowchart illustrating the operation of an electronic device according to a second embodiment of the invention. The figure which shows the example of the descending angle when a user tries to start proximity | contact input, and the rising angle when a user intends to complete | finish proximity input. FIG. 9 is a block diagram illustrating a configuration of an electronic device according to a third embodiment of the invention. 9 is a flowchart showing the operation of an electronic apparatus according to Embodiment 3 of the present invention. The figure explaining the example of the pattern input screen at the time of the pattern lock function starting of an electronic device. The figure which shows the example of a locus | trajectory when many camera shakes generate | occur | produce in proximity | contact input. FIG. 9 is a block diagram illustrating a configuration of an electronic device according to a fourth embodiment of the invention. 9 is a flowchart showing the operation of an electronic apparatus according to Embodiment 4 of the present invention.

<Explanation of terms>
[Electronics]
In the present invention, an electronic device is an electric product to which an electronic engineering technique is applied, and includes an entire display device having a display screen and capable of performing proximity input on the display screen.

[Capacitance value of display screen]
In the present invention, the capacitance value of the display screen refers to the capacitance value indicated by each reception electrode of the reception electrode array arranged on the substrate in the display screen, or each reception with respect to the capacitance value. A value obtained by subtracting a reference value determined according to the position of the electrode array is indicated. The reference value is a value defined to reduce the error, and the value varies depending on the location of the receiving electrode array. For example, a large reference value is defined for a receiving electrode array existing near the battery.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, the same number is attached | subjected to the structure part which has the same function, and duplication description is abbreviate | omitted.

  Hereinafter, the electronic apparatus according to the first embodiment will be described with reference to FIGS. FIG. 1 is a contour map showing an example of the electric field strength distribution of a capacitive touch panel by a solid line, a long broken line, and an alternate long and short dash line in descending order of electric field strength. FIG. 2 is a diagram illustrating an example in which the trajectory is interrupted when the operating finger temporarily escapes from the proximity detection space. FIG. 3 is a block diagram illustrating a configuration of the electronic apparatus 2 according to the present embodiment. FIG. 4 is a flowchart illustrating the operation of the electronic apparatus 2 according to the present embodiment. When the display screen of the electronic device is a capacitive touch panel, as shown in the example of FIG. 1, the electric field strength increases near the center of the screen, and the electric field strength decreases near the screen edge. The cause of such intensity unevenness is that the number of surrounding drive electrodes is smaller in the vicinity of the screen edge portion than in the vicinity of the center of the screen. As described above, in the proximity input, when a predetermined range is set for the capacitance value, and the maximum value of the capacitance value falls within this range, it is considered that there is an input at the coordinate where the maximum value is observed. . Generally, the lower limit value of the predetermined range is set uniformly over the entire screen without considering the intensity unevenness described above. When the lower limit value is set uniformly for the entire screen, the height of the limit at which proximity input can be detected varies depending on the location of the screen. More specifically, the limit height at which proximity input can be detected draws a dome shape (low shape at the screen end and high shape at the center of the screen) as in the proximity detection space 801 indicated by the broken line in FIG.

  In the proximity input method, the user's finger cannot be brought into contact with the screen to be stabilized, and thus hand shake is likely to occur compared to the contact input method. Hereinafter, an example where the operating finger temporarily escapes out of the proximity detection space 801 and the locus is interrupted will be described with reference to FIG. As shown in FIG. 2, it is assumed that a proximity detection space 801 is generated in a dome shape above the display screen of the electronic device 2 of the present embodiment. It is assumed that the user moves the hand state 601a to the hand state 601b, and the tip of the user's operation finger draws the virtual line 700. At this time, the position of the tip of the operating finger in the user's hand state 601a is called a virtual line start point 701, and the position of the tip of the operating finger in the user's hand state 601b is called a virtual line end point 705. In the middle of drawing the virtual line 700, it is assumed that the user's operation finger has temporarily escaped from the proximity detection space 801 due to camera shake, and the position of the tip of the operation finger at the moment of the escape is referred to as a non-detection start point 702. The position of the tip of the operating finger at the moment of re-entering the space 801 is called a detection restart point 704, and the section of the virtual line 700 that has escaped outside the proximity detection space 801 is called an escape section 703. As will be described later, the electronic device 2 according to the present exemplary embodiment includes virtual lines in the virtual line 700 regarding the section from the virtual line start point 701 to the non-detection start point 702 and the section from the detection restart point 704 to the virtual line end point 705. A line projected 700 on the display screen is detected as a locus input by the user. On the other hand, since the escape section 703 of the virtual line 700 is not detected, the detected locus has a shape divided into two. For example, when it is desired to input continuously using the electronic device 2, the occurrence of such non-detection causes troublesomeness. For example, these problems occur when the user wants to input characters by hand using the proximity input method or when inputting a pattern for unlocking the pattern. The electronic device 2 of the present embodiment has the following configuration in order to solve this problem.

  As shown in FIG. 3, the electronic device 2 of the present embodiment includes a capacitance measuring unit 11, a locus detecting unit 12, a locus storing unit 13, a disappearance length output unit 24, a correcting unit 25, and display control. Part 16.

  The capacitance measuring unit 11 measures a capacitance distribution that is a two-dimensional distribution of capacitance values on the display screen (S11). As described above, the capacitance value of the display screen is the capacitance value indicated by each reception electrode of the reception electrode array arranged on the substrate in the display screen, or the reference value is subtracted from the capacitance value. Point to a value. The trajectory detection unit 12 detects, when the maximum value of the capacitance value at each time is within a predetermined range, the coordinates at which the maximum value is measured as the trajectory coordinates at each time, and detects the time series of the trajectory coordinates as the trajectory. (S12). The trajectory storage unit 13 stores the detected trajectory (S13). The disappearance length output unit 24 outputs the disappearance point coordinates, the redetection point coordinates, and the disappearance length that is the distance between the two points when the trajectory coordinates are not detected and then redetected (S24). The vanishing point coordinates correspond to the coordinates of a point obtained by projecting the non-detection start point 702 on the display screen in the example of FIG. Further, the redetection point coordinates correspond to the coordinates of the point where the detection restart point 704 in the example of FIG. 2 is projected on the display screen. . Next, the correction | amendment part 25 complements between a vanishing point coordinate and a redetection point coordinate, when vanishing length is below a predetermined threshold value (S25). The interpolation method may simply be linear interpolation or curve interpolation using a spline curve or the like. For example, when the electronic device is moving, the predetermined threshold value in step S25 may be set large. Whether or not the electronic device is moving may be set manually by the user, or when the electronic device includes an acceleration sensor, the correction unit 25 may perform movement determination using the acceleration value. . In addition, the correction unit 25 may perform movement determination using GPS information or the like, and change the threshold value according to the result of movement determination. The interpolation method may simply be linear interpolation or curve interpolation using a spline curve or the like. The display control unit 16 displays the corrected locus on the display screen (S16).

  Thus, according to the electronic apparatus 2 of the present embodiment, the disappearance length output unit 24 outputs the disappearance length that is the distance between the vanishing point coordinates and the redetection point coordinates, and the correction unit 25 has a predetermined disappearance length. Since the gap between the vanishing point coordinates and the redetection point coordinates is complemented when the threshold value is equal to or less than the threshold value, erroneous input can be prevented even if the user's hand is shaken during proximity input.

  Next, an electronic apparatus according to a second embodiment will be described with reference to FIGS. 5, 6, and 7. FIG. 5 is a diagram illustrating an example in which the operating finger escapes out of the proximity detection space near the end of the device and the trajectory is interrupted. FIG. 6 is a block diagram illustrating a configuration of the electronic apparatus 3 according to the present embodiment. FIG. 7 is a flowchart showing the operation of the electronic apparatus 3 according to the present embodiment.

  As described above, when the lower limit value of the predetermined range for the capacitance value is uniformly set for the entire screen, the limit height at which the proximity input can be detected is the proximity detection space 801 indicated by the broken line in FIG. A dome shape (low at the edge of the screen and high at the center of the screen) is drawn. When the user has a tendency to perform proximity input at a position close to the upper limit of the proximity detection space 801, the proximity input of the user is detected well near the center of the display screen, but good near the edge of the display screen. It will not be detected. For example, as illustrated in FIG. 5, it is assumed that a proximity detection space 801 is generated in a dome shape above the display screen of the electronic device 3 of this embodiment. It is assumed that the user moves the hand state 601c to the hand state 601d and the tip of the user's operation finger draws a virtual line 710. At this time, the position of the operating finger tip in the user's hand state 601c is referred to as a virtual line start point 711, and the position of the operating finger tip in the user's hand state 601d is referred to as a virtual line end point 714. In the middle of drawing the virtual line 710, it is assumed that the limit height at which the proximity input can be detected is different, so that the operating finger has escaped out of the proximity detection space 801, and the position of the tip of the operating finger at the moment of escape is not detected. The section of the virtual line 710 that has escaped outside the proximity detection space 801 is referred to as an escape section 713. Of the virtual line 710, for the section from the virtual line start point 711 to the non-detection start point 712, a line obtained by projecting the virtual line 710 on the display screen is detected as a locus. On the other hand, the escape section 713 in the virtual line 710 is not detected. The occurrence of such non-detection causes troublesomeness as described above. In order to solve this problem, the electronic device 3 of the present embodiment has the following configuration.

  As shown in FIG. 6, the electronic apparatus 3 according to the present embodiment includes a capacitance measuring unit 11, a locus detecting unit 12, a locus storing unit 13, an area storing unit 341, an area determining unit 342, and a traveling direction detection. Part 343, correction part 35, and display control part 16. The difference between the electronic device 2 of the first embodiment and the electronic device 3 of the present embodiment is that the disappearance length measurement unit 24 in the first embodiment is the region storage unit 341, the region determination unit 342, and the traveling direction detection unit in the present embodiment. The only difference is that the correction unit 25 in the first embodiment is changed to the correction unit 35 in the present embodiment. First, steps S11, S12, and S13 are executed as in the first embodiment. Next, the area determination unit 342 determines whether or not the vanishing point coordinates are located within a predetermined area stored in advance in the area storage unit 341 when the locus coordinates are not detected (S342). . The vanishing point coordinates correspond to the coordinates of a point obtained by projecting the non-detection start point 712 on the display screen in the example of FIG. In the example of FIG. 5, the predetermined area stored in advance in the area storage unit 341 corresponds to, for example, a certain area 900 (indicated by a thin broken line indicating the boundary between the areas) belonging to the screen edge. In this case, the vanishing point coordinates, which are points where the non-detection start point 712 is projected on the display screen, are located in the area 900.

  Next, when the vanishing point coordinates are located within a predetermined region, the traveling direction detection unit 343 detects the traveling direction of the trajectory in the vanishing point coordinates based on the trajectory, and determines the traveling direction and the vanishing point coordinates. It outputs (S343). The traveling direction detection unit 344 can detect the traveling direction by calculating the direction of the velocity vector at each time, for example. Next, the correction unit 35 extends the locus from the vanishing point coordinates in the traveling direction (S35). At this time, the length of the trajectory extended by the correction unit 35 can be set as appropriate. For example, the correction unit 35 may extend the locus to the end of the display screen.

  As described above, according to the electronic apparatus 3 of the present embodiment, the region determination unit 342 determines whether the vanishing point coordinates are located in a predetermined region stored in advance in the region storage unit 341, and detects the traveling direction. The unit 343 detects the traveling direction of the locus in the vanishing point coordinates, and the correction unit 35 extends the locus in the traveling direction from the vanishing point coordinates, thereby preventing erroneous input that is likely to occur near the edge of the screen at the time of proximity input. be able to.

  Next, an electronic apparatus according to a third embodiment will be described with reference to FIG. 8, FIG. 9, and FIG. FIG. 8 is a diagram showing an example of a descending angle when the user tries to start proximity input and an ascending angle when the user tries to end proximity input. FIG. 9 is a block diagram illustrating a configuration of the electronic apparatus 4 according to the present embodiment. FIG. 10 is a flowchart showing the operation of the electronic device 4 according to the present embodiment.

  When performing proximity input, the user lowers the tip of the operating finger vertically downward at the beginning of input, and causes the tip of the operating finger to enter the proximity detection space. Thereafter, the user draws a virtual line with the tip of the operation finger. The user raises the tip of the operating finger vertically upward at the end of input, and causes the tip of the operating finger to escape from the proximity detection space. An example of the proximity input described above will be described with reference to FIG. The user moves the hand state 601e to the hand state 601f, and the tip of the user's operation finger draws a virtual line 720. At this time, the position of the tip of the operating finger in the user's hand state 601e is called a virtual line start point 721, and the position of the tip of the operating finger in the user's hand state 601f is called a virtual line end point 729. In the vicinity of the imaginary line starting point 721, the imaginary line 720 is inclined downward in the vertical direction, and this inclination angle is referred to as a descending angle 722. The section of the imaginary line inclined vertically downward is called a descending section 723, and its end point is called a descending section end point 724. A section of a virtual line 720 with a small inclination extending from the descending section end point 724 is called a stable section 725, and the end point is called a stable section end point 726. In the vicinity of the imaginary line end point 729, the imaginary line 720 is inclined vertically upward, and this inclination angle is referred to as a rising angle 727. The section of the imaginary line inclined vertically upward is referred to as the rising section 728, and the end point thereof is the imaginary line end point 729 described above. In this example, when the user thinks that only the stable section 725 is recognized as the locus, the locus on which the descending section 723 and the ascending section 728 are projected becomes an erroneous input. In order to avoid this type of erroneous input, the user must start the proximity input by lowering the operating finger substantially vertically, and this operation is not intuitive for the user and causes annoyance. In order to solve this problem, the electronic device 4 of the present embodiment has the following configuration.

  As shown in FIG. 9, the electronic device 4 of the present embodiment includes a capacitance measuring unit 11, a locus detecting unit 12, a locus storing unit 13, a differentiating unit 441, a deletion determining unit 442, and a correcting unit 45. Display control unit 16. The difference between the electronic device 2 of the first embodiment and the electronic device 4 of the present embodiment is that the disappearance length output section 24 in the first embodiment is changed to a differentiation section 441 and a deletion determination section 442 in the present embodiment. The correction unit 25 in the first embodiment is only changed to the correction unit 45 in the present embodiment. First, steps S11, S12, and S13 are executed as in the first embodiment. Next, the differentiating unit 441 calculates a differential value in the time direction of the capacitance at each trajectory coordinate, and outputs the differential value and each trajectory coordinate (S441). The differential value in the time direction of the capacitance at each locus coordinate is a parameter expressing the descending angle 722 and the ascending angle 727 in FIG. The deletion determination unit 442 determines whether or not to delete each locus coordinate based on the differential value (S442). For example, if the absolute value of the differential value exceeds a predetermined threshold, the deletion determination unit 442 determines to delete the trajectory coordinate corresponding to the differential value, and otherwise determines that the trajectory coordinate is not deleted. be able to. The correction unit 45 deletes the trajectory coordinates determined to be deleted from the trajectory (S45).

  Thus, according to the electronic apparatus 4 of the present embodiment, the differentiating unit 441 calculates the differential value in the time direction of the electrostatic capacitance at each trajectory coordinate, and the deletion determination unit 442 uses each trajectory based on the differential value. Since it is determined whether or not the coordinates are to be deleted, and the correction unit 45 deletes the locus coordinates determined to be deleted from the locus, it is possible to prevent erroneous input that is likely to occur at the start and end of proximity input. it can. Also, according to the electronic device 4 of the present embodiment, when a finger or the like accidentally enters the proximity detection space 801, these can be deleted from the trajectory, which is suitable for preventing this type of erroneous input. is there.

  Next, an electronic apparatus according to a fourth embodiment will be described with reference to FIGS. 11, 12, 13, and 14. FIG. 11 is a diagram illustrating an example of a pattern input screen when the pattern lock function of the electronic device is activated. FIG. 12 is a diagram illustrating an example of a locus when a lot of camera shake occurs in proximity input. FIG. 13 is a block diagram illustrating a configuration of the electronic apparatus 5 according to the present embodiment. FIG. 14 is a flowchart showing the operation of the electronic apparatus 5 according to this embodiment.

  For example, circular guide symbols are arranged and arranged at equal intervals on the pattern input screen when the pattern lock function is activated. The user draws the lock pattern set by the user using the guide symbol as a guide. By combining the proximity input method and the pattern lock function, the user's fingerprint does not remain on the display screen of the electronic device, which is preferable from the viewpoint of security. An example of the pattern input screen will be described with reference to FIG. In this example, a total of nine circular guide symbols 91-1, 91-2, 91-3, 91-4, 91-5 in three columns in the vertical direction and three columns in the horizontal direction are displayed on the display screen 90 of the electronic device 5. 91-6, 91-7, 91-8, 91-9 are arranged and displayed at equal intervals. In this example, an example in which the user draws the lock pattern set by the user by proximity input will be described with reference to FIG. In the example of FIG. 12, the user draws lock patterns in the order of guide symbols 91-1, 91-4, 91-7, 91-8. As described above, the proximity input method is more likely to cause camera shake than the contact input method. In the example of FIG. 12, the trajectory drawn by the user blurs in small increments in a direction (Tr) orthogonal to the finger traveling direction (Mv). Such blurring also causes tremors of the user's own fingers, and when vibrations occur in the user's surrounding environment, these vibrations are also a cause. As a case where the vibration is generated in the user's surrounding environment, for example, the user is on a train or a car is considered. For example, when the electronic device 5 is used for continuous input, if a blur occurs in the direction (Tr) orthogonal to the direction of movement (Mv) of the finger, it causes a wrong input, which is a problem. In order to solve this problem, the electronic device 5 of the present embodiment has the following configuration.

  As shown in FIG. 13, the electronic device 5 of the present embodiment includes a capacitance measuring unit 11, a locus detecting unit 12, a locus storing unit 13, a traveling direction detecting unit 54, a correcting unit 55, and a display control unit. 16 and the like. The difference between the electronic device 2 of the first embodiment and the electronic device 5 of the present embodiment is that the disappearance length output section 24 in the first embodiment is changed to a traveling direction detection section 54 in the present embodiment. The correction unit 25 in 1 is only changed to the correction unit 55 in this embodiment. First, steps S11, S12, and S13 are executed as in the first embodiment. Next, the traveling direction detection unit 54 detects the traveling direction of the locus at each locus coordinate. The traveling direction detection unit 54 can detect the traveling direction by calculating the direction of the velocity vector at each time, for example. Next, the correcting unit 55 corrects the trajectory so that the fluctuation of the trajectory in the direction orthogonal to the traveling direction becomes small (S55). The correcting unit 55 can correct the locus with respect to the amount of change of the locus, for example, by a process of dividing a coefficient determined by using the speed of the locus in the traveling direction as a variable.

  As described above, according to the electronic apparatus 5 of the present embodiment, the traveling direction detection unit 54 detects the traveling direction of the locus, and the correction unit 55 reduces the variation of the locus in the direction orthogonal to the traveling direction. Since the locus is corrected, it is possible to prevent erroneous input that is likely to occur due to camera shake.

  In addition, the various processes described above are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Needless to say, other modifications are possible without departing from the spirit of the present invention.

  Further, when the above-described configuration is realized by a computer, processing contents of functions that each device should have are described by a program. The processing functions are realized on the computer by executing the program on the computer.

  The program describing the processing contents can be recorded on a computer-readable recording medium. As the computer-readable recording medium, for example, any recording medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory may be used.

  The program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Furthermore, the program may be distributed by storing the program in a storage device of the server computer and transferring the program from the server computer to another computer via a network.

  A computer that executes such a program first stores, for example, a program recorded on a portable recording medium or a program transferred from a server computer in its own storage device. When executing the process, the computer reads a program stored in its own recording medium and executes a process according to the read program. As another execution form of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to the computer. Each time, the processing according to the received program may be executed sequentially. Also, the program is not transferred from the server computer to the computer, and the above-described processing is executed by a so-called ASP (Application Service Provider) type service that realizes the processing function only by the execution instruction and result acquisition. It is good.

  Note that the program in this embodiment includes information that is used for processing by an electronic computer and that conforms to the program (data that is not a direct command to the computer but has a property that defines the processing of the computer). In this embodiment, the present apparatus is configured by executing a predetermined program on a computer. However, at least a part of these processing contents may be realized by hardware.

Claims (7)

A capacitance measuring unit that measures a capacitance distribution that is a two-dimensional distribution of capacitance values on the display screen;
A trajectory detection unit that determines trajectory coordinates at each time based on the capacitance value at each time, and detects a time series of the trajectory coordinates as a trajectory;
A correction unit that corrects the locus under a predetermined condition;
Including electronic equipment. The electronic device according to claim 1,
When the trajectory coordinates are not detected and then re-detected, the vanishing point coordinates that are the coordinates detected immediately before the trajectory coordinates are not detected, and the re-detection points that are the coordinates where the trajectory coordinates are re-detected Further including a vanishing length output unit that outputs coordinates and a vanishing length that is a distance between the two points;
The correction unit is an electronic device that complements between the vanishing point coordinates and the redetection point coordinates when the vanishing length is equal to or less than a predetermined threshold. The electronic device according to claim 1,
An area determination unit that determines whether or not the vanishing point coordinates, which are coordinates detected immediately before the locus coordinates are not detected, are located within a predetermined area when the locus coordinates are not detected; ,
When the vanishing point coordinates are located in the predetermined area, the traveling direction of the locus in the vanishing point coordinates is detected based on the locus, and the traveling direction and the vanishing point coordinates are output. A direction detection unit,
The correction unit is an electronic device that extends the locus in the traveling direction from the vanishing point coordinates. The electronic device according to claim 1,
A differential unit that calculates a differential value in the time direction of capacitance at each trajectory coordinate, and outputs the differential value and each trajectory coordinate;
A deletion determination unit that determines whether or not to delete each locus coordinate based on the differential value,
The correction unit is an electronic device that deletes the locus coordinates determined to be deleted from the locus. The electronic device according to claim 1,
A traveling direction detector for detecting a traveling direction of the locus in each locus coordinate;
The correction unit is an electronic device that corrects the trajectory so that the fluctuation of the trajectory in a direction orthogonal to the traveling direction is reduced.   A program for causing an electronic device to function as the electronic device according to any one of claims 1 to 5. A capacitance measuring step for measuring a capacitance distribution which is a two-dimensional distribution of capacitance values on the display screen;
A trajectory detection step for determining trajectory coordinates at each time based on the capacitance value at each time, and detecting a time series of the trajectory coordinates as a trajectory;
A correction step of correcting the locus under a predetermined condition;
Trajectory correction method including

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