TW201421325A - Optical touch devices and operation method thereof - Google Patents

Abstract

An embodiment of the invention provides an operation method for an optical touch device. The optical touch device comprises a panel, a left sensor and a right sensor. The method comprises: sensing a sensing waveform on the panel; determining number of peaks of the sensing waveform to control the optical touch device to be switched to a gesture mode or a touch mode; when the optical touch device operates in the gesture mode, estimating a first variation according to a first sensing waveform sensed by the left sensor and a second variation according to a second sensing waveform sensed by the right sensor; determining a gesture of a user according to the first variation and the second variation.

Description

Optical touch device and its operation method

The invention relates to an optical touch device, in particular to an optical touch device with a gesture recognition mechanism.

Recently, due to the development of optical touch panels, the interaction between the user and the optical touch device can be performed by the user's fingers. Some of the current optical touch devices can support touch operations performed by one or two fingers of the user, and some can be operated by gestures that support the user's three or more fingers. At the same time, the optical touch device capable of supporting the touch operation and the gesture operation needs to perform an additional operation through the user to switch between the two modes of the touch operation and the gesture operation, thereby increasing the inconvenience of the user in the touch operation.

An embodiment of the present invention provides an optical touch device that is applicable to an optical touch device. The optical touch device includes a screen panel, a left sensor, and a right sensor. The method includes: sensing a sensing waveform on the screen panel; determining a number of peaks on the sensing waveform to control the optical touch device to switch to a gesture mode or a touch mode; When the device operates in the gesture mode, estimating a first change amount according to a first sensing waveform sensed by the left sensor, and sensing a second sensing waveform according to the right sensor. Estimating a second amount of change; determining a gesture of the user according to the first amount of change and the second amount of change.

Another embodiment of the invention is an optical touch device. The optical touch The control device includes a screen panel, a left side sensor, a right side sensor and a gesture judging unit. The left sensor is disposed on the left side of the screen panel to sense a first sensing waveform. A right sensor is disposed on the right side of the screen panel to sense a second sensing waveform. The gesture determining unit determines a gesture of the user according to the first sensing waveform and the second sensing waveform.

Other objects and advantages of the present invention will become apparent from the embodiments disclosed herein.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

Fig. 1 is a view showing an optical touch device according to an embodiment of the present invention. Referring to FIG. 1 , the optical touch device 1 includes a screen panel 11 , a left sensor 12 , a right sensor 13 , a mode determining unit 14 , a touch determining unit 15 , and a gesture determining unit 16 . . When the optical touch device 1 is in operation, the user can touch the screen panel 11 through at least one object to perform a touch operation or a gesture operation. The object may be a user's finger or a stylus. In the embodiment of the present invention, the object is described by taking a user's finger as an example. In this embodiment, the mode determining unit 14, the touch determining unit 15, and the gesture determining unit 16 are implemented by a hardware circuit or by a processor or a controller executing different programs or software.

In general, the optical touch device can be occluded or reflective. Surgery. In the occlusion type optical touch device, a reflective strip is disposed around the screen panel. When the user's finger touches the screen panel, the brightness sensed by the contacted position is reduced. In the reflective optical touch device, a astigmatism strip is disposed around the screen panel. When the user's finger touches the screen panel, the brightness sensed by the contacted position is increased.

When the optical touch device 1 is in operation, the left sensor 12 and the right sensor 13 are used to sense the brightness of the light on the screen panel 11 to obtain the sensing waveforms, respectively. Please refer to Figure 2A. When the optical touch device 1 is in operation and the screen panel 11 is not touched, the left-side sensor 12 is taken as an example to illustrate that the sensing waveform S11 generated by the left-side sensor 12 has an original waveform, wherein the horizontal axis represents the left side. The pixel position on the sensor 12, while the vertical axis represents the intensity of light sensed by each pixel on the left sensor 12. The mode judging unit 14 sets a critical waveform STH, wherein the light intensity of each pixel on the critical waveform STH is smaller than the light intensity of the corresponding pixel on the original waveform. For example, the light intensity of each pixel on the critical waveform STH is 0.75 times the light intensity of the corresponding pixel on the original waveform.

It should be noted that the pixel of the sensor is actually a sensing unit on the sensor. In other words, taking FIG. 1 as an example, the pixel 0 to the pixel 500 represent the sensing unit 0 to the sensing unit 500.

When the user touches the screen panel 11 with two fingers, the waveform S11 is sensed. As shown in FIG. 2B, two peaks P1 and P2 exceeding (below) the critical waveform STH appear, respectively corresponding to the two contacts. finger. Therefore, the mode judging unit 14 can know the number of fingers contacting the screen panel 11 by judging the number of peaks lower than the critical waveform STH, and generate a switching signal according to the judgment result, and control the light according to the switching signal by a controller. The touch device 1 is switched to a gesture mode or a touch mode. In other words, in this embodiment, the number of fingers contacting the screen panel 11 determines whether the optical touch device 1 operates in a gesture mode or a touch mode.

In this embodiment, the gesture of the optical touch device 1 is performed by contacting the screen panel 11 with three fingers or more than three fingers, and one finger or two fingers contact the screen panel 11 to perform the optical touch device 1 The touch operation is taken as an example. When the optical touch device 1 operates in the gesture mode, the left sensor 12 and the right sensor 13 sense the signal is transmitted to the gesture determination unit 16 to determine the user's gesture. When the optical touch device 1 is in the touch mode, the signals sensed by the left sensor 12 and the right sensor 13 are transmitted to the touch determination unit 15 to determine the user's touch on the screen panel 11. position.

3 is a flow chart showing a method of operating an optical touch device according to an embodiment of the invention. Hereinafter, the operation method of the optical touch device will be described based on the first and third figures. The switching method shown in FIG. 3 is used as an example when the optical touch device 1 is in the touch mode. When the optical touch device 1 is in the touch mode, the mode determination unit 14 determines the number of peaks on the waveform sensed by the left sensor 12 and the right sensor 13 (step S30). In an embodiment, the mode judging unit 14 only needs to judge the number of peaks on the waveform sensed by the left side sensor 12 or the right side sensor 13.

When the mode judging unit 14 judges that the number of peaks on the waveform sensed by the left side sensor 12 and/or the right side sensor 13 is greater than or equal to three (a predetermined number) (≧3), the user is represented by three fingers. Or three or more fingers touch the screen panel 11, and the mode judging unit 14 issues a switching signal. The controller controls the optical touch device 1 to switch to the gesture mode (step S31). Next, in step S33, the gesture determination unit 16 determines a gesture of the user based on the waveform sensed by the left side sensor 12 and the right side sensor 13.

When the mode judging unit 14 judges that the number of peaks on the waveform sensed by the left side sensor 12 and/or the right side sensor 13 is less than three (<3), it indicates that the user touches through one finger or two fingers. The screen panel 11, when the mode determining unit 14 issues a switching signal, has informed the controller to maintain the optical touch device 1 in the touch mode (step S31). In the touch mode, the touch determination unit 15 can correspond to the left side sensor 12 and the right side sensor 13 according to the waveform upper peak sensed by the left side sensor 12 and the right side sensor 13 . The pixel position is used to determine the touch position of the user on the screen panel 11.

4 is a flow chart of a method for judging a gesture of an optical touch device according to the present invention. The gesture judging method of the present embodiment is executed by the gesture judging unit 15 as shown in Fig. 1. In addition, in an embodiment, the gesture determining unit 15 includes a touch position determining unit that can roughly estimate the position of the user on the screen panel 11. In addition, the accuracy of the touch position determining unit is smaller than the touch determining unit 15 . In step S41, the gesture judging unit 15 calculates the amount of change in the average position or dispersion degree of the peak on the waveform sensed by the left side sensor 12 and the right side sensor 13 within a predetermined time.

For example, if the left sensor 12 senses three peaks, and estimates the positions P1, P2, and P3 of the user's finger on the screen panel 11. The degree of dispersion refers to the average of the sum of the squares of the distance differences between the positions P1, P2, and P3 and an average position. Please refer to the following formula.

θ = degree of dispersion; X _i = peak position; σ = average position of peak; N = number of peaks.

In another example, the degree of dispersion can be calculated in other ways. For example, the left sensor 12 senses that the pixels of the user's three fingers are pixels 150, 180, and 240, respectively. Therefore, the degree of dispersion can be expressed as: (240-150) / 500 = 0.18

Further, in another embodiment, the amount of change in the average position of the positions P1, P2 may also be used. In the present embodiment, the predetermined time means that the start to the end of a gesture is detected. In this embodiment, the left side sensor 12 and the right side sensor 13 have a sensing frame rate, and the left side sensor 12 and the right side sensor 13 are in each A user's gesture is sensed inside the frame. The gesture judging unit 15 calculates an average position of the finger position of the user in each frame. Please refer to Figure 5. Figure 5 is a schematic diagram of an average position and time corresponding to a gesture. When the gesture is detected, the gesture judging unit 15 waits for a predetermined time t1, and then, when estimated at the time point t1, the user's gesture is located at an initial position P1 on the screen panel 11. At the time point t2, the gesture judging unit 15 judges that the user gesture has ended, and therefore it is estimated that the user's gesture is located at a current position P2 on the screen panel 11 at the time point t2. Then, the gesture judging unit 15 calculates an average position change amount corresponding to the user's gesture: the amount of change = (P2-P1) / P1

In step S42, the gesture judging unit 15 obtains a plurality of numbers according to the obtained change amount and a weighting equation group including a plurality of weight equations. Weights. The weight equation can be referred to the 6A~6D diagram. The equation of Fig. 6A, viewed from the optical touch device 1 of Fig. 1, indicates that the user's gesture may be down. The equation of Fig. 6B, viewed from the optical touch device 1 of Fig. 1, indicates that the user's gesture may be upward. The equation of Fig. 6C, viewed from the optical touch device 1 of Fig. 1, indicates that the user's gesture may be left untouched. The 6D graph is a schematic diagram of a program group that aggregates the aforementioned equations.

In addition, the 6A to 6C graphs can also be represented by equations. For example, Figure 6A can be expressed as the following equation:

Where μ is the weight value and v is the amount of change.

Then, the gesture determining unit 15 calculates a first amount of change according to the sensing result of the left side sensor 12 and calculates a second amount of change according to the sensing result of the right side sensor 13 . The gesture judging unit 15 substitutes the first change amount and the second change amount into a weight equation group, such as the 6D map, to obtain a plurality of weight values corresponding to different equations. In addition, in order to avoid the misjudgment of the gesture judging unit 15, the equations in the 6A to 6D graphs set two threshold values, and only the amount of change is located between the two threshold values to be used for gesture judgment.

In step S43 of Fig. 4, the gesture judging unit 15 obtains a plurality of feature score values based on the equal weight values and a gesture judgment equation group. Please refer to the following instructions for detailed actions.

Assuming that the gesture determination unit 15 substitutes the obtained first change amount into the 6A graph, a first weight value μ1 can be obtained, and the first change amount is substituted into the 6B. In the figure, a second weight value μ2 can be obtained and the first change amount can be substituted into the 6C chart, and a second weight value μ3 can be obtained. The gesture judging unit 15 substitutes the obtained second change amount into the 6A graph, and obtains a fourth weight value μ4, and substitutes the second change amount into the 6B graph, and obtains a fifth weight value μ5 and a second Substituting the amount of change into the 6C chart, a sixth weight value μ6 can be obtained. The gesture judging unit 15 then substitutes the first variation amount μ1 to the sixth variation amount μ6 into a gesture judgment equation group to obtain a plurality of feature score values.

The gesture judgment equation group includes a plurality of gesture judgment equations, and each gesture judgment equation corresponds to a gesture. Please refer to Figure 1. When the gesture of the user is moving upward, the pixel number of the gesture sensed by the left sensor 12 is gradually increased, and the pixel number of the gesture sensed by the right sensor 13 is gradually increased. Therefore, the equation for the feature score value of the gesture up can be obtained as follows: E1=μ _{left, increase} ×μ _{right, increase}

The μ _{left of} this side refers to the weight value obtained by substituting the amount of change in the average position sensed by the left sensor 12 into the equation of Fig. 6B. M _{right, the increase} refers to the weight value obtained by substituting the amount of change in the average position sensed by the right sensor 13 into the equation of Fig. 6A.

When the user's gesture is moving downward, the pixel number of the gesture sensed by the left sensor 12 is gradually reduced, and the pixel number of the gesture sensed by the right sensor 13 is gradually reduced. Therefore, the equation for the feature score value of the gesture down can be obtained as follows: E2 = μ _{left, decrease} × μ _{right, decrease}

The μ _{left of} this side refers to the weight value obtained by substituting the amount of change in the average position sensed by the left sensor 12 into the equation of Fig. 6A. μ _{Right, the decrease} refers to the weight value obtained by substituting the amount of change in the average position sensed by the right sensor 13 into the equation of Fig. 6A.

When the user's gesture is to move to the left, the pixel number of the gesture sensed by the left sensor 12 is gradually reduced, and the pixel number of the gesture sensed by the right sensor 13 is gradually increased. Therefore, the equation for the feature score of the gesture to the left can be obtained as follows: E3 = μ _{left, decrease} × μ _{right, increase}

The μ _{left of} this side refers to the weight value obtained by substituting the amount of change in the average position sensed by the left sensor 12 into the equation of Fig. 6A. μ _{Right, the increase} refers to the weight value obtained by substituting the amount of change in the average position sensed by the right sensor 13 into the equation of Fig. 6B.

When the user's gesture is moving to the right, the pixel number of the gesture sensed by the left sensor 12 is gradually increased, and the pixel number of the gesture sensed by the right sensor 13 is gradually reduced. Therefore, the equation for the feature score of the gesture to the right can be obtained as follows: E4=μ _{left, increase} ×μ _{right, decrease}

The μ _{left of} this side refers to the weight value obtained by substituting the amount of change in the average position sensed by the left sensor 12 into the equation of Fig. 6B. μ _{Right, the decrease} refers to the weight value obtained by substituting the amount of change in the average position sensed by the right sensor 13 into the equation of Fig. 6A.

In summary, the gesture judgment equation group can be expressed as follows: E1=μ _{left, increase} ×μ _{right, increase}

E2=μ _{left, decrease} ×μ _{right, decrease}

E3=μ _{left, decrease} ×μ _{right, increase}

E4=μ _{left, increase} ×μ _{right, decrease}

It should be noted that the gesture judgment equation group of the present embodiment is generated for the optical touch device 1 of FIG. If the left sensor 12 is different from the right sensor 13 or the position of the configuration is different, the gesture judgment equation group will also change.

After obtaining a plurality of feature score values, the gesture determination unit 15 determines that the user's gesture is determined based on the feature score values. Please refer to the description below for details.

Assuming μ _{left, increase} to 0, μ _{left, decrease} to 0.5, μ _{right, increase} to 0, μ _{right, decrease} to 0.5, and substitute the gesture judgment equation group to obtain the following characteristic score values: E1=0

E2=0

E3=0.25

E4=0

As can be seen from the above, E3 has the highest feature score, so the user's gesture is downward.

In addition, in order to avoid misjudgment, it can be determined whether the highest feature score value is greater than a threshold value from the gesture judgment equation group. If not, it may be a false positive. The gesture judging unit 15 will again judge the user's gesture based on the signal sensed by the left side sensor 12 and the right side sensor 13.

FIG. 7 is a schematic diagram of an embodiment of a gesture sensing device. The sensor 71 is configured to sense a gesture of the user on the optical touch device to generate at least one sensing waveform. The position estimating unit 72 then receives the sensing waveform to estimate the amount of change in an average position of the user's gesture. The motion mode judging unit 73 includes a motion pattern equation group, and the motion pattern equation group includes Corresponding to the motion pattern equations of different motion modes. The motion mode judging unit 73 substitutes the received change amount into the motion mode equation group to obtain a plurality of weight values. Next, the gesture judging unit 74 substitutes the equal weight values into a gesture judgment equation group to obtain a plurality of feature score values, and judges the user's gesture according to the feature score values.

It is to be noted that the position estimating unit 72, the motion mode judging unit 73, and the gesture judging unit 74 shown in Fig. 7 can be integrated into the gesture judging unit 16 as shown in Fig. 1.

Figures 8A-8E are schematic diagrams of a plurality of equations of motion patterns. Figure 8A shows that the user's gesture is greatly increased. That is, the amount of movement of the user's gesture on the optical touch device is greater than a predetermined value, and moves to the upper side of the optical touch device such that the amount of change in the average position of the user's gesture is greater than the first threshold value. _L. The weight value obtained by substituting the amount of change in the average position of the user's gesture into the FIG. 8A is expressed by a _{large increase} in μ.

Figure 8B shows that the user's gesture is a small increase. That is, the amount of movement of the user's gesture on the optical touch device may be less than the predetermined value and moved to the upper side of the optical touch device, so that the amount of change in the average position of the user's gesture may be less than the first threshold. The value Th _L . The weight value obtained by substituting the amount of change in the average position of the user's gesture into the FIG. 8B is expressed by a _{slight increase} in μ.

Figure 8C shows that the user's gesture is unchanged. That is to say, the gesture of the user may not move in the optical touch device, so that the variation of an average position of the user's gesture may be less than the first threshold Th _L and greater than the second threshold -Th _L . The weight value obtained by substituting the amount of change in the average position of the user's gesture into the 8C chart _is expressed in _{the same manner as} μ.

Figure 8D shows that the user's gesture is a small increase. That is, the amount of movement of the user's gesture on the optical touch device may be less than the predetermined value and moved to the lower side of the optical touch device, so that the amount of change in the average position of the user's gesture may be greater than the second threshold. The value -Th _L . The weight value obtained by substituting the amount of change in the average position of the user's gesture into the 8D graph is represented by a _{sharp decrease} in μ.

Figure 8E shows that the user's gesture is greatly reduced. That is, the amount of movement of the user's gesture on the optical touch device is greater than a predetermined value, and moves to the lower side of the optical touch device such that the amount of change in the average position of the user's gesture is less than the second threshold value - Th _L. The weight value obtained by substituting the amount of change in the average position of the user's gesture into the 8E figure is expressed by a _{slight decrease} in μ.

According to the aforementioned motion mode equation, the corresponding gesture judgment equation group is expressed as follows: Score _{upward gesture} = μ is _{slightly increased, left} × μ is _{slightly increased, right}

Score _{down gesture} = μ is _{slightly reduced, left} × μ is _{slightly reduced, right}

Score _{slightly leftward gesture} = μ _{slightly decreased, left} × μ _{slightly increased, right}

Score _{slightly to the right gesture} = μ _{slightly increased, left} × μ _{slightly decreased, right}

Score _{greatly left to the left gesture} = μ _{greatly reduced, left} × μ _{increased significantly, right}

Score _{greatly to the right gesture} = μ _{greatly increased, left} × μ _{greatly reduced, right}

Score is _{inwardly grasped} = μ is _{maintained the same, left} × μ is _{maintained the same, right} × μ _{variation is greatly reduced, left} × μ _{variation is greatly reduced, right}

Assuming that the amount of change obtained by the left sensor and the right sensor on the optical touch device is Th _L /4, the following weight values can be obtained: μ is _{greatly increased, left} =0

μ _{greatly increased, right} = 0

μ _{slightly increased, left} = 0.25

μ _{slightly increased, right} = 0.25

μ _{remains the same, left} = 0.75

μ _{remains the same, right} = 0.75

μ _{decreases slightly, left} = 0

μ is _{slightly reduced, right} = 0

μ is _{greatly reduced, left} =0

μ is _{greatly reduced, right} = 0

In addition, it is assumed that the ratio of the dispersion of the peaks of the waveforms obtained by the left sensor and the right sensor on the optical touch device is -Th _H , then the left sensor and the right sensor The weight of the obtained peak position dispersion is greatly reduced as follows: the _{amount of change in} μ _{is greatly reduced, left} =1

The _{amount of} μ _{change is greatly reduced, right} =1

Substituting the above weight values into the gesture judgment equation group, the following feature score values can be obtained: Score _{upward gesture} = 0.0625

Score _{down gesture} = 0

Score _{slightly left gesture} =

Score _{slightly right gesture} =0

Score _{greatly left gesture} =

Score _{greatly right gesture} =

Score _{inward capture} =0.5625

The feature score corresponding to the inwardly grasped motion mode equation is the highest, and is greater than a predetermined threshold value, such as 0.5, so that the user can be judged currently The gesture is to catch inward.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent. In addition, any of the objects or advantages or features of the present invention are not required to be achieved by any embodiment or application of the invention. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the invention.

1‧‧‧Optical touch device

11‧‧‧Screen panel

12‧‧‧ Left sensor

13‧‧‧Right sensor

14‧‧‧ mode judgment unit

15‧‧‧Touch judgment unit

16‧‧‧ gesture judgment unit

71‧‧‧ Sensors

72‧‧‧Location Estimation Unit

73‧‧‧Sports mode judgment unit

74‧‧‧ gesture judgment unit

Fig. 1 is a view showing an optical touch device according to an embodiment of the present invention.

Figure 2A is a schematic diagram of the original waveform sensed by the sensor on the optical touch device.

FIG. 2B is a waveform diagram of the sensor sensing the user's motion on the optical touch device.

3 is a flow chart showing a method of operating an optical touch device according to an embodiment of the invention.

4 is a flow chart of a method for judging a gesture of an optical touch device according to the present invention.

Figure 5 is a schematic diagram of an average position and time corresponding to a gesture.

Figures 6A to 6D are intents for a plurality of weight equations.

FIG. 7 is a schematic diagram of an embodiment of a gesture sensing device.

Figures 8A-8E are schematic diagrams of a plurality of equations of motion patterns.

1‧‧‧Optical touch device

11‧‧‧Screen panel

12‧‧‧ Left sensor

13‧‧‧Right sensor

14‧‧‧ mode judgment unit

15‧‧‧Touch judgment unit

16‧‧‧ gesture judgment unit

Claims (15)

An optical touch device is applicable to an optical touch device. The optical touch device includes a screen panel, a left sensor, and a right sensor. The method includes: sensing the screen a sensing waveform on the panel; determining the number of peaks on the sensing waveform to control the optical touch device to switch to a gesture mode or a touch mode; when the optical touch device operates in the gesture mode, according to The first sensing waveform sensed by the left sensor estimates a first change amount of a gesture position of the user on the screen panel, and the first sensor sensed according to the right sensor The second sensing waveform estimates a second amount of change of the gesture position of the user on the screen panel; and determining the gesture of the user according to the first amount of change and the second amount of change. The method of operating the optical touch device of claim 1, wherein the sensing waveform is one of the first sensing waveform and the second sensing waveform. The method of operating the optical touch device of claim 1, further comprising: substituting the first variation and the second variation into a motion mode equation group to obtain a plurality of weight values; and according to the The weight value determines the gesture of the user. The method of operating an optical touch device according to claim 3, wherein the motion mode equation is generated according to the position of the left sensor and the right sensor on the screen panel. The method for operating an optical touch device according to claim 3, further comprising: substituting the weight values into a gesture judgment equation group to obtain a plurality of feature scores; and determining the user's The gesture. The method of operating an optical touch device according to claim 5, wherein a first feature score corresponding to the gesture is a maximum of the feature scores. The method for operating an optical touch device according to claim 5, further comprising: determining a maximum feature score of the feature scores; and determining the user when the maximum feature score is greater than a predetermined value The gesture. An optical touch device includes: a screen panel; a left sensor disposed on the left side of the screen panel to sense a first sensing waveform; and a right side sensor disposed on the screen panel The right side is for sensing a second sensing waveform; and a gesture determining unit determines a gesture of the user according to the first sensing waveform and the second sensing waveform. The optical touch device of claim 8, further comprising: a mode determining unit, determining the number of peaks on the first sensing waveform or the second sensing waveform to determine the operation of the optical touch device In a gesture Mode or a touch mode. The optical touch device of claim 8, wherein the gesture determining unit estimates a first change amount of a gesture position of the user on the screen panel according to the first sensing waveform, and according to the The second sensing waveform estimates a second amount of change of the gesture position of the user on the screen panel, and determines the gesture of the user according to the first amount of change and the second amount of change. The optical touch device of claim 10, further comprising: a motion mode determining unit having a motion mode equation group, the motion mode determining unit substituting the first variation amount and the second variation amount into one The motion mode equation group obtains a plurality of weight values, so that the gesture determination unit determines the gesture of the user according to the weight values. The optical touch device of claim 11, wherein the motion mode equation is generated according to the position of the left sensor and the right sensor on the screen panel. The optical touch device of claim 11, further comprising: a gesture judgment equation group, the gesture determination unit substituting the weight value into the gesture judgment equation group to obtain a plurality of feature scores, and according to the The feature score determines the gesture of the user. The optical touch device of claim 13, wherein a first feature score corresponding to the gesture is a maximum of the feature scores. The optical touch device of claim 13, wherein The gesture determination unit further determines a maximum feature score of the feature scores, and when the maximum feature score is greater than a predetermined value, the gesture determination unit determines the gesture of the user.