CN101788857B - Input system and related method for an electronic device - Google Patents

Abstract

The invention relates to an input system for an electronic device and a related method. Specifically, the input system for the electronic device comprises an input device, a control device, a camera and an image processing unit. The input device and the control device are arranged outside the main body of the electronic device, and the image processing unit is arranged in the main body. The input device comprises a plurality of input units and a plurality of input symbols which are correspondingly marked; the control device is used for touching and pressing one input unit of the plurality of input units in the input device to generate an indication signal; the camera is used for obtaining an image of the touch input unit of the control device, and the image comprises an indication signal; the image processing unit is coupled to the camera, and judges that the input unit is pressed according to the position of the indication signal in the image, so as to generate input data corresponding to the input symbol of the input unit. The invention flexibly uses different input devices according to requirements, reduces the occupied area of the keyboard on the mechanism shell of the electronic device and further achieves the purpose of product miniaturization.

Description

Input system and related method for an electronic device

technical field

The present invention relates to an input system and related method for an electronic device, in particular to an input system and related method for obtaining an image of an input device being pressed through a camera and generating input data accordingly.

Background technique

With the advancement of computer technology, various electronic products such as desktop computers, notebook computers, mobile phones or personal digital assistants are becoming more and more popular in modern life. In order to meet consumers' needs for convenience and aesthetics, electronic products are also developing towards miniaturization and thinning.

Please refer to FIG. 1 , which is a functional block diagram of a conventional electronic device 10 . The electronic device 10 can be a computer, a mobile phone or a personal digital assistant, and includes a screen 100 , a signal processing unit 102 and a keyboard 104 . The signal processing unit 102 is coupled between the screen 100 and the keyboard 104 . The user inputs data through the keyboard 104 , and the signal processing unit 102 processes the input data, and displays the processing result, such as character input or page switching, on the screen 100 . In the electronic device 10, the keyboard 104 is the most important input interface, and also occupies a considerable area in the product mechanism casing. If the keyboard is also miniaturized, it will inevitably cause inconvenience to consumers.

In addition, as far as mobile phones are concerned, mobile phones that integrate the functions of personal digital assistants, computers, and cameras, such as commonly known as smart phones, have become mainstream in the market. Compared with ordinary mobile phones, smart phones are similar to computers, with a keyboard with more keys and a larger area to support complete input functions. Therefore, it is a great design challenge to balance the functionality and miniaturization of the product at the same time.

Contents of the invention

Therefore, the main purpose of the present invention is to provide an input system and related method for an electronic device, so that the electronic device can meet the goals of functionality and miniaturization.

The invention discloses an input system for an electronic device, which includes an input device, a control device, a camera and an image processing unit. The electronic device includes a main body, the input device is arranged outside the main body, and includes a plurality of input units correspondingly marked with a plurality of input symbols; the control device is arranged outside the main body, and is used to touch the input device an input unit of the plurality of input units to generate an indication signal; the camera is used to obtain an image of the control device pressing the input unit, and the image includes the indication signal; the image processing unit is arranged on the host computer In the body, coupled to the camera, it is used for judging that the input unit is pressed according to the position of the indication signal in the image, so as to generate an input data corresponding to an input symbol of the input unit.

The invention also discloses an electronic device, which includes a screen, a signal processing unit and an input system, and the screen and the signal processing unit are all arranged in a main body of the electronic device. The screen is used to display images, the signal processing unit is coupled to the screen, and is used to process an input data to generate a processing result, and output the processing result to the screen. The input system is coupled to the signal processing unit and includes an input device, a control device, a camera and an image processing unit. The input device is arranged outside the main body, and includes a plurality of input units correspondingly marked with a plurality of input symbols; the control device is arranged outside the main body, and is used to touch an input unit of the plurality of input units in the input device, to generate an indication signal; the camera is used to obtain an image of the control device pressing the input unit, and the image includes the indication signal; the image processing unit is arranged in the main body and coupled to the camera for According to the position of the indication signal in the image, it is judged that the input unit is pressed, so as to generate the input data corresponding to an input symbol of the input unit, and transmit the input data to the signal processing unit.

The present invention also discloses an input method for an electronic device, wherein an input device of the electronic device includes a plurality of input units, and the plurality of input units are correspondingly marked with a plurality of input symbols. The input method includes using a control device to press an input unit in the input device to generate an indication signal; obtaining an image of the control device pressing the input unit in the input device, the image including the indication signal; and According to the position of the indication signal in the image, it is judged that the input unit is pressed, so as to generate an input data corresponding to an input symbol of the input unit.

The present invention uses an input device other than the electronic device, a control device for touching the input device, a camera, and an image processing unit provided in the main body of the electronic device as the input system of the electronic device. Compared with the known technology, the embodiment of the present invention flexibly uses different input devices as required, reduces the area occupied by the keyboard on the mechanical casing of the electronic device, and further achieves the purpose of product miniaturization.

Description of drawings

FIG. 1 is a functional block diagram of a known electronic device.

FIG. 2 is a functional block diagram of an electronic device according to an embodiment of the present invention.

FIG. 3 is a schematic view of the use of the electronic device in FIG. 2 .

FIG. 4 is a schematic diagram of the input device of FIG. 3 .

FIG. 5 is an image of an input device according to an embodiment of the present invention.

6A and 6B are schematic diagrams of variant embodiments of the control device in FIG. 2 .

FIG. 7 is a schematic diagram of a process of an embodiment of the present invention.

Description of main component symbols:

10, 20 Electronic device 218 Memory

100, 200 screen 400 outer tube body

102, 202 Signal processing unit 402 Inner tube body

104 Keyboard 404 Elastic component

210, 30 input device 408 tail end

22 Main body 410, 412 Blocking part

204 Input System 50 Process

212, 40 control device 500, 502, 504, 506,

214 Camera 508, 510, 512, 514 steps

216 Image processing unit

Detailed ways

Please refer to FIG. 2 and FIG. 3 at the same time. FIG. 2 is a functional block diagram of an electronic device 20 according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of the use of the electronic device 20 . The electronic device 20 can be a mobile phone, a personal digital assistant or a computer, etc., and includes a main body 22 , an input device 210 and a control device 212 . The input device 210 and the control device 212 are independent from the main body 22 and are part of an input system 204 of the electronic device 20 . The main body 22 includes a screen 200 , a signal processing unit 202 , a camera 214 , an image processing unit 216 and a memory 218 . The input system 204 includes an input device 210 , a control device 212 , a camera 214 and an image processing unit 216 . The biggest difference between the embodiment of the present invention and the known electronic device 10 is that the input device 210 is arranged outside the main body 22, and the input device 210, the control device 212, the camera 214 and the image processing unit 216 constitute the input system 204 of the electronic device 20 ; And the input system of the known electronic device 10 shown in FIG. 1 is the keyboard 104 .

In short, the present invention takes an input device other than the main body 22 as the input device of the electronic device 20 , and uses an image processing method to analyze the image when the user uses the input device 210 and convert it into input data. In FIG. 3 , the input device 210 is a keyboard image drawn by the user according to personal habits, and includes a plurality of input units and two positioning symbols A and B. As shown in FIG. Each input unit in the input device 210 is marked with an input symbol, such as letters Q, W, numbers 1, 2 or symbols *, #, etc., indicating the input unit that inputs the symbol 1, and is referred to as the input unit 1 hereinafter. The positioning symbols A and B are two points in the input device 210 that can be identified by the image processing unit 216 , and variant implementations thereof will be described in detail later. Each input unit, the input symbols in the input unit, and the positioning symbols A and B must be different from the color of the surrounding environment when drawing, so that the image processing unit 216 can judge the position of the input unit, the position of the positioning symbols, and the input location based on the color difference. The content of the symbol. For example, in FIG. 3 , the input units of the input device 210 are distinguished by frames. The input units of the input device 210 can also be distinguished by colored blocks.

Please refer to FIG. 2 and FIG. 3 again. In FIG. 3, the control device 212 is a finger cot worn by the user on the finger to touch the input unit in the input device 210. The input unit is preferably a light-emitting diode switch circuit, including a power supply VIN , a light-emitting diode D, a current-limiting resistor R and a switch SW, as shown in FIG. 2 . When the user holds the control device 212 and touches an input unit, the switch SW is turned on so that the LED switching circuit forms a closed loop and current flows through. At this time, the LED D emits a colored light source, which is an indication signal. The indication signal is a signal recognizable by the image processing unit 216 , for example, the color of a block in the image is different or changes from the surrounding area, which is used to help the image processing unit 216 determine the position of the input unit that is pressed. When the user holds the control device 212 away from the input unit, the switch SW is closed, the switch circuit of the LED is open, and no current flows through. At this time, the LED D does not generate an indication signal. It can be seen from the above that the control device 212 can generate an indication signal through the action of the user touching the input unit. In other embodiments of the present invention, the control device 212 may also include other suitable lighting devices, or the indication signal may be generated by different control devices, which will be described in detail later.

The camera 214 is used to obtain an image of the user holding the control device 212 and pressing the input device 210 , as shown in FIG. 3 . The image processing unit 216 is coupled to the camera 214, and is used for analyzing the image obtained by the camera 214 to know which input unit is pressed, and to generate an input data corresponding to the input symbol of the input unit. The signal processing unit 202 is coupled between the screen 200 and the image processing unit 216 for processing input data generated by the image processing unit 216 to generate a processing result, such as character display or page switching, and output to the screen 200 for display. In the known electronic device 10, the keyboard 104 is arranged in the main body of the electronic device 10, and the input data received by the signal processing unit 102 is a signal directly generated by the keyboard 104; in contrast, in the electronic device 20, the input device The input data received by the signal processing unit 202 is generated by the image processing unit 216 after analyzing the image obtained by the camera 214 . Therefore, the input method and appearance design of the electronic device 20 are more flexible than the conventional technology.

The operation of the image processing unit 216 is described in detail as follows. Please note here that the camera 214 acquires an image of the input device 210 before the user holds the control device 212 and starts to touch the input device 210 . Next, the image processing unit 216 recognizes the positioning symbols A, B, each input unit, and each input symbol according to the image of the input device 210 . Please refer to FIG. 4 , which is a schematic diagram of the input device 210 . First, the image processing unit 216 recognizes the positioning symbols A and B according to the color difference between the positioning symbols A and B and the background in the image of the input device 210, and recognizes the positioning symbols A and B according to the color difference between the outer frame of each input unit and the background in the image of the input device 210. Out of the image boundary of each input unit. Accordingly, the image processing unit 216 can take one corner of the image boundary of each input unit, such as the upper left corner, and mark it as the coordinate point of each input unit. At the same time, the image processing unit 216 recognizes the image boundary of each input symbol according to the color difference between the input symbol and the background in the image of the input device 210 , and then determines the content of each input symbol. On the other hand, the image processing unit 216 connects the positioning symbols A and B in the image to form a coordinate Y axis, and takes the positioning symbol B as the coordinate origin to form a coordinate perpendicular to the Y axis on the plane where the input device 210 is located. One embodiment of X-axis setting, the setting of positive and negative directions of coordinates X-axis and Y-axis in the present invention is not limited to that shown in FIG. 4 . After the coordinate axes are established, the image processing unit 216 uses the distance P between the positioning symbols A and B as the unit distance, for the coordinate points of each input unit (in the embodiment shown in FIG. 4, the coordinate points of each input unit The position of each input unit is defined as the upper left corner of each input unit, of course, it can also be set at the center position of each input unit) to mark the coordinates, and the coordinates of each input unit correspond to the input symbols represented by each input unit. For example, in FIG. 4 , according to the unit distance, the coordinates of the upper left corner of the input unit 2 are expressed as (0.3P, 0.8P), corresponding to the input symbol "2". The image processing unit 216 stores the obtained coordinates and corresponding input symbols of each input unit in the memory 218 .

The coordinate positioning of each input unit and the recognition process of each input symbol mentioned above are performed by the image processing unit 216 immediately when the camera 214 starts to acquire the image of the input device 210 , and the user does not need to scan the input device 210 manually. With the speed of the current image processing technology, the image processing unit 216 has enough time to complete the above-mentioned coordinate positioning and input symbol recognition procedures before the user touches the input unit, and the obtained coordinates of each input unit and the corresponding input symbols are stored in the memory 218 . Next, the user starts to hold the control device 212 and touch the input device 210 to input data. Meanwhile, the camera 214 continues to capture images of the user pressing the input device 210 with the control device 212 .

In the image of the control device 212 touching the input device 210 , there is an obvious color point change generated by the input device 210 and the light emitting diode D of the control device 212 , that is, an indication signal. The image processing unit 216 determines which input unit is pressed according to the position of the positioning symbols A, B and the indication signal, so as to generate input data corresponding to the input symbol of the pressed input unit. In detail, firstly, the image processing unit 216 recognizes the indication signal according to the color difference between the indication signal and the background, and calculates the coordinates of the indication signal using the coordinate axes previously established according to the positioning symbols A and B. Since the coordinate point of each input unit has been defined as the upper left corner of the image boundary of each input unit, next, the image processing unit 216 only needs to search the coordinates of the closest input unit in the upper left direction of the coordinates of the indication signal to determine Which input unit is pressed. Assuming that the coordinates of each of the N input units of the input device 210 are expressed as (Xn, Yn), 1≤n≤N, the coordinates of the indication signal are (x, y). The image processing unit 216 searches for the closest input unit coordinates to the upper left of the coordinates (x, y). square input unit), and then search for the input unit coordinates that are closest to the coordinates of the indication signal in the set of input unit coordinates that meet the conditions.

Taking FIG. 4 as an example, the coordinates of the indication signal are (0.35P, 0.75P), and the image processing unit 216 finds the coordinate point (0.3P, 0.8P) closest to the upper left input unit according to the coordinates. This coordinate point corresponds to to input unit 2. Therefore, the image processing unit 216 determines that the input unit 2 is pressed, and generates input data corresponding to the input symbol “2” (eg, hexadecimal data “000002”) to the signal processing unit 202 . After processing the input data, the signal processing unit 202 outputs the processing result to the screen 200, so the screen 200 displays "2", as shown in FIG. 3 . Or, the image processing unit 216 can set the upper right corner of the input unit image as the coordinate point of the input unit according to the information of the image boundary of the input unit after judging the boundary of each input unit in the image; in this way, the image processing unit 216 You can first ignore the input unit coordinates of Xn<x or Yn<y (that is, the input unit that is not located at the upper right of the indicator signal), and then search for the closest coordinate to the indicator signal in the set of input unit coordinates that meet the conditions. Enter cell coordinates. Please note here that the operation of the above-mentioned image processing unit 216 to determine the input unit being pressed is only two embodiments of the present invention, and the input unit and method for determining the input unit being pressed are determined according to the positions of the two positioning symbols and the indication signals in the image. , should be covered in the scope of protection required by the claims of the present invention.

The electronic device 20 shown in FIG. 2 and FIG. 3 is an embodiment of the present invention. In fact, the camera 214 does not have to be located in the main body 22 of the electronic device 20, but can also be externally connected to the main body 22, such as a desktop computer with an external network camera. . The distance between the camera 214 and the input device 210 is not a fixed distance, and the angle at which the camera 214 shoots the input device 210 is not limited to a fixed angle, as long as the resolution capability of the image processing unit 216 is sufficient to analyze the image of the input device 210 obtained by the camera 214. . The input device 210 can be a physical keyboard, such as a keyboard of a desktop computer or a keyboard of a telephone. If the above-mentioned keyboard is used, the user does not necessarily need to use the control device 212 to touch the keyboard to generate a colored indication signal, but can also judge the touched input unit through the coordinate movement generated after the input unit is pressed. In addition, no matter in the hand-drawn keyboard image or the physical keyboard, the positioning symbols A and B can be hand-marked symbols, or need not be specially marked, but are two coordinate points arbitrarily obtained by the image processing unit 216 from the keyboard image.

Regarding the above variant embodiment, please refer to FIG. 5 , which is an image of an input device 30 according to an embodiment of the present invention. The input device 30 is a keypad of a telephone and can be used in the electronic device 20 instead of the input device 210 . If the camera 214 obtains the image of the input device 30, the image processing unit 216 can recognize the image boundary of each input unit according to the color difference between each input unit and the background in the image, and take the upper left corner of each input unit as the coordinates of each input unit point. Similarly, the image processing unit 216 recognizes the image boundary of each input symbol according to the color difference between the input symbol and the background in the image, and then determines the content of each input symbol. It is worth noting that the image of the input device 30 does not specifically draw positioning symbols, but the image processing unit 216 arbitrarily takes the coordinate points of input unit 1 and input unit 2 as positioning symbols from the coordinates of multiple input units. , and take the coordinate point of input unit 1 as the origin to form a coordinate axis. If the distance P between the coordinates of input unit 1 and input unit 2 is taken as the unit distance, when the input unit 8 is not pressed, the coordinates of the input unit 8 are (2P, -1.25P), and its image boundary is shown by the dotted line . When the user presses the input unit 8, the image processing unit 216 knows from the image that the image boundary of the input unit 8 moves to the position shown by the solid line, and then knows that the coordinates of the input unit 8 change, by (2P,-1.25P ) to (2.1P, -1.35P). In other words, the image processing unit 216 knows which input unit is pressed according to the movement of the coordinates of the input unit instead of the indication signal. Please note here that although the physical keyboard is used, if the image processing unit 216 cannot detect the movement of the input unit coordinates from the image, for example, the line of sight captured by the camera 214 is perpendicular to the plane of the input unit of the input device 210, at this time, The image processing unit 216 still has to rely on the indication signal to determine the input unit that is pressed.

Please refer to FIG. 6A and FIG. 6B . FIG. 6A and FIG. 6B are schematic diagrams of a control device 40 according to an embodiment of the present invention. The control device 40 is a variant embodiment of the control device 212 , which is a stylus and can be placed in a pen holder of the electronic device 20 . The control device 40 includes an outer tube body 400 , an inner tube body 402 , an elastic component 404 and a tail end 408 . The tail end 408 is connected to the inner tube body 402 and can be exposed or retracted from the outer tube body 400 for pressing the input device 210 . The color of the tail end 408 must be different from the surrounding environment, and can be clearly identified by the image processing unit 216 . The inner tube body 402 is disposed in the outer tube body 400 and passes through the elastic component 404 . The elastic component 404 is disposed in the outer tube body 400 and located between a blocking portion 410 of the inner tube body 402 and a blocking portion 412 of the outer tube body 400 . When the user holds the control device 40 and touches the input device 210 with the tail end 408, the tail end 408 receives a reaction force, so that the blocking portion 410 of the inner tube body 402 presses the elastic component 404, and the elastic component 404 is compressed to shorten its length. , so that the tail end 408 retracts into the outer tube body 400, as shown in FIG. 6B. When the tail end 408 leaves the input device 210 , the reaction force is released, and the elastic component 404 returns to the unstressed state. At this time, the tail end 408 also returns to the position exposed to the outer tube body 400 , as shown in FIG. 6A . For the image processing unit 216, the change of the exposed and retracted tail end 408 is equal to the indication signal in the image, and the image processing unit 216 judges the block in the image where the color changes, and knows which input unit is pressed.

In short, the electronic device 20 obtains an image of the input device 210 through the camera 214 first, and recognizes the position of each input unit and the content of each input symbol through the image processing unit 216 . Next, the electronic device 20 acquires an image of when the user touches the input device 210 with the control device 212 through the camera 214 , and analyzes the image through the image processing unit 216 to determine which input unit is pressed. Known electronic devices usually use the keyboard in the main body of the electronic device as an input system, but the embodiment of the present invention uses an input device 210 outside the main body of the electronic device, a control device 212, a camera 214, and an image processing unit 216 to form an electronic device. 20 input system 204 . In comparison, the electronic device 20 can flexibly use different keyboards as needed, which reduces the area occupied by the keyboards on the mechanical casing of the electronic device 20 , thereby achieving the purpose of product miniaturization. In addition, the keyboard in the embodiment of the present invention can also use composite keys. When the image captured by the camera 214 contains multiple indication signals, the image processing unit 216 can determine which input units are pressed according to the positions of the multiple indication signals. To generate a plurality of corresponding input data to the signal processing unit 202 . The signal processing unit 202 performs corresponding actions according to multiple input data and displays them on the screen 200 .

For the operation flow of the electronic device 20 in FIG. 2 , please refer to FIG. 7 . FIG. 7 is a schematic diagram of a process 50 according to an embodiment of the present invention, and the process 50 includes the following steps:

Step 500: start.

Step 502 : The camera 214 obtains an image of the input device 210 before the control device 212 touches the input device 210 .

Step 504: The image processing unit 216 recognizes the positions of all input units in the input device 210 and the contents of all input symbols according to the positions of the positioning symbols A and B in the image of the input device 210 .

Step 506 : The camera 214 acquires an image of an input unit in the control device 212 touching the input device 210 .

Step 508: The image processing unit 216 judges that the input unit is pressed according to the position of the indication signal and the positions of the positioning symbols A and B in the image, so as to generate an input data corresponding to an input symbol of the input unit.

Step 510: The signal processing unit 202 processes the input data to generate a processing result.

Step 512: The screen 200 displays an image of the processing result.

Step 514: end.

In the process 50, the camera 214 first obtains the image of the input device 210, and the image processing unit 216 recognizes the positions of all input units in the input device 210 and the contents of all input symbols. Therefore, when the user holds the control device 212 and touches the input device 210 , the image processing unit 216 can continue to judge which input unit is pressed according to the position of the indication signal and the positions of the positioning symbols A and B in the image, and generate corresponding input data. Finally, the signal processing unit 202 processes the input data to generate a processing result, which is displayed on the screen 200 . As can be seen from the above, steps 502 to 508 are the operation flow of the input system 204 . For the detailed operation of each step in the process 50 , such as the method of obtaining the coordinate points of each input unit, the method of judging the touched input unit and the variant implementation of the indication signal, please refer to the above, and will not repeat them here.

In summary, the embodiments of the present invention use an input device other than the electronic device, a control device for touching the input device, a camera, and an image processing unit provided in the main body of the electronic device as the input system of the electronic device. . Compared with the known technology, the embodiment of the present invention flexibly uses different input devices as required, reduces the area occupied by the keyboard on the mechanical casing of the electronic device, and further achieves the purpose of product miniaturization.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the claims of the present invention shall fall within the scope of the present invention.

Claims (30)

1. An input system for an electronic device, the electronic device comprising a main body, the input system comprising: An input device, arranged outside the main body, includes a plurality of input units correspondingly marked with a plurality of input symbols; A control device, arranged outside the main body, used to touch and press at least one of the input units in the input device to generate an indication signal; a camera for acquiring an image of the control device pressing the input unit, the image including the indication signal; and An image processing unit, set in the main body, coupled to the camera, used to identify the indication signal according to the color difference between the indication signal and the background in the image, and calculate the value of the indication signal position, judging that the input unit is pressed, so as to generate an input data corresponding to an input symbol of the input unit. 2. The input system according to claim 1, wherein the camera is further used to obtain an image of the input device before the control device touches the input device. 3. The input system according to claim 2, wherein the image processing unit is further used to identify the multiple positioning symbols in the input device according to the image of the input device and the two positioning symbols in the image of the input device. The position of an input unit and the plurality of input symbols. 4. The input system according to claim 1, wherein the image processing unit judges that the input unit is pressed according to the position of the indication signal and the positions of the two positioning symbols in the image, so as to generate the input data described above. 5. The input system as claimed in claim 4, wherein the positions of the two positioning symbols are two coordinate points obtained randomly from the image by the image processing unit. 6. The input system as claimed in claim 1, wherein said control device comprises a light emitting device, said indication signal is generated by said light emitting device. 7. The input system as claimed in claim 6, wherein the light emitting device is a light emitting diode. 8. The input system of claim 1, wherein said control means comprises: an outer tube body including a first blocking portion; an inner tube body, disposed in the outer tube body, including a second blocking portion; a tail end, connected to the inner tube body and can be exposed or retracted from the outer tube body, the color of the tail end is different from the surrounding environment; and An elastic component is arranged between the first blocking portion and the second blocking portion and the inner tube body passes through the elastic component, and is used for controlling the tail end to be exposed or retracted to the outer tube body. 9. The input system according to claim 8, wherein the indication signal is a state of the tail end being exposed or retracted from the outer tube body. 10. The input system as claimed in claim 1, wherein the input device is a physical keyboard or a keyboard image. 11. An electronic device comprising: a screen, set in a main body of the electronic device, for displaying images; a signal processing unit, set in the main body, coupled to the screen, for processing an input data to generate a processing result, and output the processing result to the screen; and An input system, coupled to the signal processing unit, includes: An input device, arranged outside the main body, includes a plurality of input units correspondingly marked with a plurality of input symbols; A control device, arranged outside the main body, used to touch and press at least one of the input units in the input device to generate an indication signal; a camera for obtaining an image of the control device pressing the input unit, the image including the indication signal; and An image processing unit, set in the main body, coupled to the camera and the signal processing unit, used to identify the indication signal according to the color difference between the indication signal and the background in the image, and calculate The position of the indication signal is output, and the input unit is judged to be pressed, so as to generate the input data corresponding to an input symbol of the input unit, and transmit the input data to the signal processing unit. 12. The electronic device as claimed in claim 11, wherein the camera is further used to obtain an image of the input device before the control device touches the input device. 13. The electronic device as claimed in claim 12, wherein the image processing unit is also used to The image of the location and the two positioning symbols in the image of the input device to identify the plurality of input units in the input device The location of and the plurality of input symbols. 14. The electronic device according to claim 11, wherein the image processing unit judges that the input unit is pressed according to the position of the indication signal and the positions of the two positioning symbols in the image, so as to generate the input data described above. 15. The electronic device according to claim 14, wherein the positions of the two positioning symbols are two coordinate points obtained randomly from the image by the image processing unit. 16. The electronic device as claimed in claim 11, wherein the control device comprises a light emitting device, and the indication signal is generated by the light emitting device. 17. The electronic device as claimed in claim 16, wherein the light emitting device is a light emitting diode. 18. The electronic device of claim 11, wherein the control means comprises: an outer tube body including a first blocking portion; an inner tube body, disposed in the outer tube body, including a second blocking portion; a tail end, connected to the inner tube body and can be exposed or retracted from the outer tube body, the color of the tail end is different from the surrounding environment; and An elastic component is arranged between the first blocking portion and the second blocking portion and the inner tube body passes through the elastic component, and is used for controlling the tail end to be exposed or retracted to the outer tube body. 19. The electronic device as claimed in claim 18, wherein the indication signal is a state of the tail end being exposed or retracted from the outer tube body. 20. The electronic device as claimed in claim 11, wherein the input device is a physical keyboard or a keyboard image. 21. An input method for an electronic device, an input device of the electronic device includes a plurality of input units, and the plurality of input units are correspondingly marked with a plurality of input symbols, the input method comprising: using a control device to press at least one of the input units in the input device to generate an indication signal; obtaining an image of the control device pressing the input unit in the input device, the image including the indication signal; and Recognize the indication signal according to the color difference between the indication signal and the background in the image, calculate the position of the indication signal, determine that the input unit is pressed, and generate an input corresponding to the input unit A symbolic input data. 22. The input method according to claim 21, further comprising acquiring an image of the input device before the control device touches the input device. 23. The input method according to claim 22, further comprising identifying the positions of the plurality of input units in the input device and the positions of the input units according to the image of the input device and the two positioning symbols in the image of the input device. Describe multiple input symbols. 24. The input method according to claim 21, wherein the step of judging that the input unit is pressed according to the position of the indication signal in the image to generate the input data is based on the position of the indication signal in the image. The position of the indication signal and the positions of the two positioning symbols are used to determine that the input unit is pressed to generate the input data. 25. The input method as claimed in claim 24, wherein the positions of the two positioning symbols are two coordinate points obtained randomly from the image by the image processing unit. 26. The input method as claimed in claim 21, wherein the control device comprises a light emitting device, and the indication signal is generated by the light emitting device. 27. The input method as claimed in claim 26, wherein the light emitting device is a light emitting diode. 28. The input method according to claim 21, wherein said control means comprises: an outer tube body including a first blocking portion; an inner tube body, disposed in the outer tube body, including a second blocking portion; a tail end, connected to the inner tube body and can be exposed or retracted from the outer tube body, the color of the tail end is different from the surrounding environment; and An elastic component is arranged between the first blocking portion and the second blocking portion and the inner tube body passes through the elastic component, and is used for controlling the tail end to be exposed or retracted to the outer tube body. 29. The input method according to claim 28, wherein the indication signal is the state of the tail end being exposed or retracted from the outer tube body. 30. The input method as claimed in claim 21, wherein the input device is a physical keyboard or a keyboard image.

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