CN107402654B - Touch detection method and touch detection system - Google Patents
Touch detection method and touch detection system Download PDFInfo
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- CN107402654B CN107402654B CN201610331621.7A CN201610331621A CN107402654B CN 107402654 B CN107402654 B CN 107402654B CN 201610331621 A CN201610331621 A CN 201610331621A CN 107402654 B CN107402654 B CN 107402654B
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- 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
- G06F3/0412—Digitisers structurally integrated in a display
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- 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
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- 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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
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- Position Input By Displaying (AREA)
Abstract
The invention discloses a touch detection method, which is used on an electronic device comprising an image sensor and comprises the following steps: (a) capturing a plurality of sensing images by the image sensor; and (b) judging whether an object executes a preset touch action on the electronic device according to the brightness change trends of the sensing images.
Description
Technical Field
The present invention relates to a touch detection method and a touch detection system, and more particularly, to a touch detection method and a touch detection system for determining a touch action by using a brightness variation trend of an image.
Background
In modern life, intelligent electronic devices such as tablet computers, intelligent electronic devices, etc. are becoming more and more popular. Such smart electronic devices usually use a capacitive touch screen as a control interface. However, the capacitive touch screen is difficult to determine more complicated touch actions such as continuous clicking. Moreover, in some cases, it may be difficult for the touch screen to determine the touch action of the user. For example, if a user wears a glove to perform a touch operation on the capacitive touch interface, the capacitance of the touch screen is not changed by the user's contact because the glove usually has an insulating effect. In this case, the touch screen cannot determine the touch action of the user.
In order to make the intelligent electronic device have a convenient control interface, some manufacturers use hardware keys as the control interface of the intelligent electronic device. FIG. 1 is a schematic diagram illustrating a hardware button used as a control interface in the prior art. As shown in FIG. 1, the electronic device 100 has a hardware button 101. The user can define the hardware key as a commonly used function key. The hardware keys may be keys fixed to the electronic device 100 or removable keys. However, either type of key has some disadvantages.
For example, if the hardware key 101 is a key fixed on the electronic device 100, the electronic device 100 should provide an area for installing the hardware key, which is not in accordance with the trend of modern electronic devices requiring compactness. In addition, if the hardware button 101 is a detachable button, the electronic device 100 should have a hole (e.g., an earphone hole) corresponding to the hardware button 101. However, not only the hole for installing the hardware key 101 cannot perform its original function, but also the hardware key 101 is easily lost when not installed on the electronic device 100.
Disclosure of Invention
An objective of the present invention is to provide a touch detection method capable of determining a touch action according to a sensed image.
Another objective of the present invention is to provide a touch detection method capable of determining a touch action according to a sensed image.
An embodiment of the present invention discloses a touch detection method, applied to an electronic device including an image sensor, including: (a) capturing a plurality of sensing images by the image sensor; and (b) judging whether an object executes a preset touch action on the electronic device according to the brightness change trends of the sensing images.
Another embodiment of the present invention discloses a touch detection system, comprising: an image sensor for capturing a plurality of sensed images; and the control unit is used for judging whether an object executes a preset touch action on a control interface according to the brightness change trends of the sensing images.
According to the embodiment, the touch action can be judged according to the sensed image, so that the problem that a capacitance type touch screen or a hardware key is used as a control interface in the prior art can be solved.
Drawings
FIG. 1 is a schematic diagram illustrating a hardware button used as a control interface in the prior art.
FIG. 2 is a schematic diagram illustrating an embodiment of determining which direction key is clicked according to a brightness change direction represented by a plurality of sensing images.
FIG. 3 is a schematic diagram showing the change of a plurality of sensing images when a finger performs a click action.
FIG. 4 is a schematic diagram illustrating a method for determining whether a click is a continuous click according to the brightness of a plurality of sensed images.
FIG. 5 is a schematic diagram illustrating a brightness variation trend of a plurality of sensing images when a finger performs a long-press operation.
Fig. 6 and 7 are schematic diagrams illustrating a touch action that may be erroneously determined as a long press action.
FIG. 8 is a diagram illustrating a state machine for determining whether a predetermined touch action is performed according to a brightness variation trend of a sensed image according to various embodiments.
Fig. 9 is a block diagram of a touch detection system according to an embodiment of the invention.
The reference numbers illustrate:
101 hard key
100 electronic device
Upper key U
Lower key D
Left key L
Right bond R
time points t1-t14
S _1 No-touch State
S _2 finger pressed state
S _3 finger-lifted State
S _4 touch action confirmation status
900 touch detection system
901 image sensor
903 convergence module
905 control unit
907 counter
909 long press module
911 continuous-striking module
913 direction key module
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The concept of the invention will be illustrated in the following with different embodiments. It is noted, however, that the systems, devices, or modules in the following embodiments may be implemented in hardware (e.g., circuitry) or a combination of hardware and software (e.g., a processing unit executing at least one program). Moreover, the objects in the following embodiments are illustrated by using a finger as an example, but it should be noted that other objects (such as a touch pen) besides a finger can also be applied to the present invention. In addition, the following description is made of a touch screen, but the present invention can also be applied to other touch interfaces (e.g., an optical touch pad).
In the following embodiments, an image sensor is used to capture a plurality of sensing images, and then the brightness variation trend of the sensing images is used to determine whether a finger performs a predetermined touch operation on an electronic device. In one embodiment, the image sensor is normally on (always on), so that any touch action is not missed, but is not limited thereto. In one embodiment, the image sensor captures the sensing image with a low resolution, and when a change in brightness is sensed, i.e., there may be a finger approaching, the image sensor switches to capture the sensing image with a higher resolution.
Fig. 2 is a schematic diagram illustrating a method for determining a direction key clicked according to a brightness change direction of a plurality of sensing images according to an embodiment of the invention (the oblique lines are finger images, and the circles are external light source images). In this embodiment, a plurality of direction keys, such as an up key U, a down key D, a left key L and a right key R, are displayed on the electronic device. When the user wants to click or long press one of the direction keys, the plurality of sensing images will present a specific rule. For example, when the user clicks or long presses the left key L, the finger usually exhibits a moving motion moving from right to left. Therefore, the low luminance region DR _1 first appears in the right direction and then moves to the left as shown in fig. 2. In another example, when the user clicks the up button U, the finger generally appears to move from bottom to top. Therefore, as shown in fig. 2, the low luminance region DR _2 first appears below and then moves upward. In summary, the embodiment shown in fig. 2 determines the direction key clicked by the object according to the brightness change direction represented by the plurality of sensing images.
How to determine whether or not a one-click action is performed will be described below. In the following embodiments, the image sensor of the electronic device is used to capture the sensing image for determining the touch action. FIG. 3 is a schematic diagram showing the change of the sensing image when the finger performs a click action (the finger image is shown in the diagonal line, and the external light source image is shown in the circle). As shown in fig. 3, when a clicking action is performed, the finger is gradually close to the touch screen, so that the sensed image Img (only one sensed image is labeled) shows a condition of changing from bright to dark, such as the sensed image Img at time t1-t 9. The touch screen is shielded from light when a finger touches the touch screen, so the sensing image Img is a dark image, such as the sensing image Img at time t10-t 11. When the finger leaves the touch screen, the sensing image Img changes from dark to light, for example, the sensing image Img at time t12-t 14. According to the content of fig. 3, it can be determined whether there is a click action by detecting whether the brightness of the plurality of sensed images is higher than a high brightness threshold or reduced to a low brightness threshold.
FIG. 4 is a schematic diagram illustrating a method for determining whether a click is a continuous click according to the brightness of a plurality of sensed images. According to the disclosure of fig. 3, if the brightness of the plurality of sensing images changes from high to lower than or equal to the low brightness threshold Th _ low and then to higher than or equal to the high brightness threshold Th _ high, it can be determined that the finger performed a click action. Thus, in the embodiment shown in FIG. 4, the finger performed 4 clicks, which is completed within a predetermined time period, and thus is considered to be a 4-tap continuous click. To sum up, the embodiment of fig. 4 can be briefly expressed as: if the number of times that the brightness of the sensed image increases to a high brightness threshold Th _ high and decreases to a low brightness threshold Th _ low within a predetermined time period is greater than or equal to a single-click threshold (e.g., 2, but other values are also possible), the predetermined touch action is determined to be a single-click action.
In one embodiment, the brightness of the sensed image is converged to a convergence value CV. Therefore, as shown in fig. 4, when no object is close to the image sensor, the average brightness of the sensed image is adjusted to converge at a convergence value CV. Therefore, the clicking or continuous clicking action can be more easily judged.
Fig. 5 to 7 are schematic diagrams illustrating a method for determining whether a long-press operation is performed according to a brightness variation trend of a plurality of sensed images according to various embodiments. The long-time pressing action of the fingers consists of putting down the fingers, indirectly or directly pressing the image sensor and separating the fingers. Referring to fig. 3 again, as mentioned above, if the finger touches the touch screen, the sensed image is a dark image. Therefore, if the finger performs a long pressing action, the number of the sensed images as dark images becomes large. Accordingly, when the finger performs a long pressing action, the number of images whose sensed images are darker may be changed from 2 to 4, 6 or more.
Referring to fig. 5, a diagram illustrating a brightness variation trend of a plurality of sensing images when a finger performs a long-press action is shown. As shown in fig. 5, after the sensed image is decreased to be less than or equal to the low brightness threshold Th _ low (finger down), the brightness of the subsequent sensed image is adjusted to be the convergence value CV. Please note that if the brightness of the sensed image is not adjusted, the sensed image should be a dark image (because it is hidden by the finger). After the brightness of the sensed image is maintained at the convergence value CV for a predetermined period of time (e.g., 1 second, but other values are also possible), the brightness of the subsequent sensed image is increased to the high brightness threshold Th _ high (finger off). Thus, the embodiment of fig. 5 can be simplified as follows: if the brightness variation trend of the plurality of sensing images is that the brightness is reduced to be lower than or equal to the low brightness critical value Th _ low and then converges to the convergence value CV, then the brightness is increased to be higher than or equal to the high brightness critical value Th _ high after returning to the convergence value CV, and the time of the brightness being the convergence value CV is higher than or equal to a preset time period, the finger is judged to perform the long-time pressing action on the electronic device.
Fig. 6 and 7 are schematic diagrams illustrating a touch action that may be erroneously determined as a long press action. As shown in fig. 6, the brightness of the plurality of sensing images does not converge to the convergence value CV after being decreased to be less than or equal to the low brightness threshold Th _ low, but is directly increased to be greater than or equal to the high brightness threshold Th _ high, so that it is possible to perform a click action rather than a long-press action. In fig. 7, the brightness of the plurality of sensed images decreases to be lower than or equal to the low brightness threshold Th _ low, and then converges to the convergence value CV, but does not increase to be higher than or equal to the high brightness threshold Th _ high. This condition may be the electronic device being moved to a dark place or being covered by other objects, not a long press.
FIG. 8 is a diagram illustrating a state machine for determining whether a predetermined touch action is performed according to a brightness variation trend of a sensed image according to various embodiments. As shown in fig. 8, the electronic device may be in 4 states: a no-touch state S _1 (e.g., the electronic device is resting on a desk or in a bag), a finger-down state S _2 (e.g., the states at t10 and t11 in FIG. 3), a finger-up state S _3 (e.g., the states at t12-t14 in FIG. 3), and a touch confirmation state S _ 4. When the electronic device is not operated, the electronic device is in a non-touch state S _ 1. When the brightness Br of the sensed image sensed by the image sensor in the electronic device is lower than or equal to the low brightness threshold Th _ low, the electronic device is changed to the finger-pressing state S _ 2. If the brightness is increased to be higher than or equal to the high brightness critical value Th _ high in this state, the finger-lift state S _3 is entered, otherwise, the non-touch state S _1 is returned. In the finger-up state S _3, if the brightness Br of the sensing image converges to the convergence value CV, the touch operation confirmation state S _4 is entered. If the brightness Br is gradually less than or equal to the low brightness threshold Th _ low, the finger-pressed state S _2 is returned.
In the touch operation confirmation state S _4, in addition to the aforementioned decrease of the brightness Br to be lower than or equal to the low brightness threshold Th _ low and then increase to be higher than or equal to the high brightness threshold Th _ high to determine whether there is a touch operation, other factors can be used to determine which touch operation is. For example, if the brightness Br is decreased to be lower than or equal to the low brightness threshold Th _ low and then increased to be higher than or equal to the high brightness threshold Th _ high (see fig. 6), it is determined that the touch operation is a click operation. If the brightness Br is decreased to be lower than or equal to the low brightness threshold Th _ low within a predetermined time period and then increased to be higher than or equal to the high brightness threshold Th _ high for a number of times higher than a click threshold (see fig. 4), it is determined that the touch operation is a click operation. If the brightness Br is decreased to be less than or equal to the low brightness threshold Th _ low, the convergence value CV is converged for a predetermined time period (i.e. a convergence interval exists), and then is increased to be greater than or equal to the high brightness threshold Th _ high (as shown in fig. 5), and the touch control action is determined as a long-press action.
Fig. 9 is a block diagram of a touch detection system according to an embodiment of the invention. As shown in fig. 9, the touch detection system 900 includes: an image sensor 901, a convergence module 903, a control unit 905, a counter 907, a long press module 909, a stroke module 911, and a direction key module 913. The image sensor 901 is used to capture a plurality of sensed images. The convergence module 903 is used to adjust the brightness of the sensed image captured by the image sensor 901 to the aforementioned convergence value CV. Many methods are available for adjusting the brightness of the sensed image, for example, adjusting the gain value of the image signal of the sensed image. The control unit 905 is used for controlling the operations of the elements. The counter 907 is used for calculating the times that the brightness of the sensed image is higher than or equal to the high brightness threshold Th _ high and lower than or equal to the low brightness threshold Th _ low according to the threshold Th (including the high brightness threshold Th _ high and the low brightness threshold Th _ low). The long press module 909, the continuous click module 911, and the direction key module 913 are used to perform the long press determination, the continuous click determination, and the direction key click, respectively.
However, it should be noted that the convergence module 903, the long-press module 909, the continuous-click module 911, and the direction key module 913 can be implemented in software and can be integrated into the control unit 905. In addition, the counter 907 may also be integrated into the control unit 905. Therefore, the touch detection system according to the present invention can be briefly described as follows: a touch detection system, comprising: an image sensor (e.g. image sensor 901 in fig. 9) for capturing a plurality of sensed images; and a control unit (for example, the control unit 905 in fig. 9) for determining whether an object performs a predetermined touch action on the electronic device according to the brightness variation trend of the sensed image.
According to the embodiment, the touch action can be judged according to the sensed image, so that the problem that a capacitance type touch screen or a hardware key is used as a control interface in the prior art can be solved.
In addition, because the invention adopts an optical mechanism to perform touch control judgment, when the electronic device uses the structure of the embodiment of the invention to perform click detection, the traditional keys or buttons do not need to be accommodated in the holes of the body of the electronic device, thereby reducing the influence of dust or water vapor on the click function.
The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the claims of the present invention should be covered by the present invention.
Claims (18)
1. A touch detection method for use in an electronic device including an image sensor, comprising:
(a) capturing a plurality of sensing images of a single object in a process of touching the electronic device by using the image sensor, wherein the sensing images comprise a dark image with a low brightness critical value when the single object is in contact with the electronic device, a bright image with a high brightness critical value when no object is close to the electronic device, a sensing image with brightness changed from bright to dark when the single object is close to the electronic device, and a sensing image with brightness changed from dark when the single object is away from the electronic device; when the time of the sensing images being dark images or bright images is higher than or equal to a preset time period, the brightness of the sensing images converges to a convergence value between a high brightness critical value and a low brightness critical value; and
(b) and judging whether an object executes a preset touch action on the electronic device according to the continuous brightness change trend of the sensing images along with the change of time among the low brightness critical value, the high brightness critical value and the convergence value.
2. The touch detection method of claim 1, wherein the predetermined touch action is a click action.
3. The touch detection method according to claim 2, wherein if the brightness variation trend of the sensing images is: after the brightness of the plurality of sensing images is reduced to be lower than or equal to the low brightness critical value, the brightness of the plurality of sensing images is directly increased to be higher than or equal to the high brightness critical value, and finally the brightness is converged to be a convergence value, and the step (b) judges that the preset touch action is a click action.
4. The touch detection method according to claim 1, wherein the predetermined touch action is a continuous click action.
5. The touch detection method according to claim 4, wherein if the brightness variation trend of the sensing images is: the number of times of increasing to a high brightness critical value and decreasing to a low brightness critical value is higher than or equal to a continuous click critical value within a predetermined time period, and the step (b) determines that the predetermined touch action is a continuous click action.
6. The touch detection method of claim 1, wherein the predetermined touch action is a long press action.
7. The touch detection method according to claim 6, wherein if the brightness variation trend of the sensing images is: decreasing to be lower than or equal to the low brightness critical value, converging to the convergence value, and then increasing to be equal to or higher than the high brightness critical value, wherein the time equal to the convergence value is higher than or equal to a preset time period, and then the step (b) judges that the object performs the long pressing action on the electronic device.
8. The method of claim 1, wherein the method is implemented on a touch screen.
9. The touch detection method of claim 1, wherein the touch detection method is implemented on an optical touch pad.
10. A touch detection system, comprising:
the image sensor is used for capturing a plurality of sensing images in the process of touching the electronic device by a single object, wherein the sensing images comprise a dark image with a low brightness critical value when the single object is in contact with the electronic device, a bright image with a high brightness critical value when no object is close to the electronic device, a sensing image with brightness changed from bright to dark when the single object is close to the electronic device, and a sensing image with brightness changed from dark to bright when the single object is away from the electronic device; when the time of the sensing images being dark images or bright images is higher than or equal to a preset time period, the brightness of the sensing images converges to a convergence value between a high brightness critical value and a low brightness critical value; and
and the control unit is used for judging whether an object executes a preset touch action on a control interface according to the continuous brightness change trend of the sensing images along with the change of time among the low brightness critical value, the high brightness critical value and the convergence value.
11. The touch detection system of claim 10, wherein the predetermined touch action is a click action.
12. The touch detection system according to claim 11, wherein if the brightness variation trend of the sensing images is: after the brightness of the plurality of sensing images is reduced to be lower than or equal to the low brightness critical value, the brightness of the plurality of sensing images is directly increased to be higher than or equal to the high brightness critical value, and then the step (b) judges that the preset touch action is a click action.
13. The touch detection system of claim 10, wherein the predetermined touch action is a continuous click action.
14. The touch detection system according to claim 13, wherein if the brightness variation trend of the sensing images is: the number of times of increasing to a high brightness critical value and decreasing to a low brightness critical value is higher than or equal to a continuous-click critical value in a preset time period, and the control unit judges that the preset touch control action is a continuous-click action.
15. The touch detection system of claim 10, wherein the predetermined touch is a long press.
16. The touch detection system according to claim 15, wherein if the brightness variation trend of the sensing images is: the control unit determines that the object performs the long pressing action on the electronic device if the object is decreased to be lower than or equal to the low brightness critical value, then converges to the convergence value, and then is increased to be equal to or higher than the high brightness critical value, and the time equal to the convergence value is higher than or equal to a preset time period.
17. The touch detection system of claim 10, wherein the control interface is a touch screen.
18. The touch detection system of claim 10, wherein the control interface is on an optical touch pad.
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