KR100778927B1 - Device capable of recognizing non-contact key selection and method thereof - Google Patents

Abstract

An apparatus capable of contactless key input and a recognition method thereof are disclosed. A contactless key input device according to an embodiment of the present invention includes a filter unit for passing only an optical image signal of a specific wavelength band, a camera unit for converting an optical image signal input through the filter unit into converted image data, and continuously from the camera unit And an image analyzer which analyzes the feature vector using the input converted image data, and a controller which controls a menu function designated to the feature vector corresponding to the analyzed feature vector among prestored feature vectors. According to the present invention, it is possible to increase the spatial utilization of the electronic device, thereby simplifying the manufacturing process and reducing the manufacturing cost thereof.

Contactless key input, filter unit, camera unit.

Description

Device capable of recognizing non-contact key selection and method

1 is a block diagram of a mobile communication terminal according to an embodiment of the present invention.

2A and 2B illustrate a state of use of a contactless key input of a mobile communication terminal according to an embodiment of the present invention.

3 is a flow chart showing the overall flow of a contactless key input recognition method according to a preferred embodiment of the present invention.

4 is a view showing waveforms of an optical video signal passing through a filter unit according to an exemplary embodiment of the present invention.

5 is a diagram showing an example of a menu function of a selected video signal according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

20: filter part

100: image analysis unit

120: control unit

140: light source

160: filter moving part

180: memory unit

280: camera unit

The present invention relates to a device capable of contactless key input and a recognition method thereof, and more particularly, to a device capable of key input using a camera imaging device and a recognition method thereof.

Recently, with the rapid development of electronics and communication engineering, users can use various functions such as internet access, video communication and video message transmission, digital music listening and satellite broadcasting by using digital home appliances or mobile communication terminals such as computers and TVs. I can enjoy it. In order to enjoy these various functions, efficient keypad input for selection is desired.

 With the development of semiconductor technology, it is possible to supply a camera imaging device at a low price, so that a computer and a mobile communication terminal equipped with the same can be widely used to easily access an electronic device equipped with a camera imaging device.

Also, with the development of computer image processing technology and image recognition technology, various application fields using the same have been developed. As one of various application fields, a technology for transferring information using a camera imaging device as an input means is being developed.

In the related art, an additional key for selecting a menu function such as a direction key and a selection key by selecting a menu function using an existing keypad (for example, a call button and a wireless internet access button for a mobile communication terminal, and for an MP3 player) File play button and file select button). Therefore, when manufacturing a digital home appliance or a mobile communication terminal, it is necessary to work on the mold, and for this reason, there is a problem in that the manufacturing process of the electronic equipment becomes complicated and the manufacturing cost thereof increases.

In addition, the conventional menu selection method is made using a keypad, which is inconvenient for the user to select the corresponding menu key one by one.

Accordingly, an object of the present invention is to remotely control a menu function using a camera imaging device in place of a keypad for an electronic device having a conventional keypad, thereby making contactless key input more convenient in using an electronic device. It is to provide a possible device and a recognition method thereof.

Another object of the present invention is to provide a device and a method for recognizing a contactless key input capable of increasing the spatial utilization of the electronic device and miniaturizing the electronic device by omitting a part of the existing keypad. .

It is still another object of the present invention to provide an apparatus capable of contactless key input and a method of recognizing the same, which can simplify the manufacturing process and reduce the manufacturing cost of the electronic device.

Still another object of the present invention is to provide a device and a method of recognizing a contactless key input capable of maximizing component utilization by allowing the provided camera to be used universally.

Other objects of the present invention will be readily understood through the following description.

According to one aspect of the invention, there is provided a device capable of contactless key input.

Device for contactless key input according to an embodiment of the present invention, the filter unit for passing only a specific wavelength band of the incident optical image signal; A camera unit for converting an optical image signal input through the filter unit into converted image data; An image analyzing unit which analyzes the characteristic vector using the converted image data continuously input from the camera unit; And a controller for controlling a menu function designated to a feature vector corresponding to the analyzed feature vector among prestored feature vectors.

The apparatus capable of inputting a contactless key may further include a light source unit for irradiating the optical image signal. Here, the optical image signal input to the filter unit may be light reflected by an external reflector among the light irradiated by the light source unit.

The light source unit, which is any quantity of 1 to n (natural numbers), may be formed on a circle centered on the camera unit.

The optical image signal input to the filter unit may be light emitted from the light emitting unit formed at one end of the indicator.

The apparatus capable of inputting a contactless key may further include a filter moving part including a moving means to remove the filter part from the front end of the camera part.

According to another aspect of the present invention, there is provided a recording medium on which a method of contactless key input and / or a program enabling execution of the method is recorded.

A contactless key input method according to an embodiment of the present invention, the method comprising the steps of: (a) the optical image signal of a specific wavelength is filtered through the filter unit; (b) generating converted image data by using the input optical image signal having a specific wavelength; (c) analyzing a characteristic vector of the converted image data; (d) searching for a feature vector corresponding to the analyzed feature vector among previously stored feature vectors; And (e) executing a designated menu function on the retrieved feature vector.

Step (a) may be started by the control signal of the control unit by the detection of the key input device or the sensor.

The optical image signal of step (a) may be light emitted from the light emitting portion formed on one side of the indicating means.

The optical image signal of step (a) may be a light input from the light source is reflected by the external reflector.

The following description merely illustrates and describes the principles of the present invention in a mobile communication terminal of an electronic device according to an embodiment of the present invention. Therefore, those skilled in the art, although not explicitly described or illustrated herein, various methods for implementing the principles of the present invention and included in the concept and scope of the present invention and devices using the same, for example, digital music player, digital video player And portable electronic devices such as PDAs (Personal Digital Assistants), portable terminals such as home theater systems, and / or home appliances. In other words, it is to be understood that all details, including the principles, aspects, and embodiments of the present invention, as well as listing specific embodiments, are intended to include structural and functional equivalents. In addition, in describing the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same or corresponding components will be denoted by the same reference numerals regardless of the reference numerals and redundant description thereof will be omitted.

1 is a block diagram of a mobile communication terminal according to an embodiment of the present invention.

1, a mobile communication terminal according to the present invention includes a filter unit 20, a filter moving unit 160, a camera unit 280, an image analyzing unit 100, a control unit 120, a light source unit 140, The memory unit 180, the wireless unit 200, the handset unit 220, the display unit 240, and the keypad unit 260 are included.

The filter unit 20 performs a function of passing only an optical image signal having a specific wavelength. The filter unit 20 should include a filter corresponding to the light source unit 140 in order to filter only light having a specific wavelength emitted from the light source unit 140 to be described later. For example, if the light source unit 140 irradiates infrared rays having good linearity and reflectivity better than visible light, the filter of the filter unit may use an infrared filter. In addition, if the light emitted from the light source unit 140 is visible light, a filter may be used to pass only a specific wavelength band. Thus, the filter may vary depending on the particular wavelength used (ie, designated) and is not particularly limited.

In the filter moving unit 160, the filter unit 20 (or the filter in the filter unit 20) is disposed on the front surface of the lens unit 40 (that is, the lens unit 40 and the subject) according to a control signal of the controller 120 to be described later. Removes from the position). To this end, the filter moving unit 160 may include a space and a driving motor for moving (and storing) the filter unit 20 or the filter. The reason for removing the filter is because when the image is captured by using the camera unit 280 mounted in the mobile communication terminal, the optical image signal of all wavelengths can be input through the lens only when the filter is removed. When the filter moving unit 160 is not included in the mobile communication terminal, the camera unit for photographing an object is preferably provided separately.

The camera unit 280 includes a lens unit 40, an image sensor unit 60, and an image signal processing unit 80. Here, the image sensor unit 60 and the image signal processing unit 80 may be integrally implemented or separated.

The camera unit 280 is input from the lens unit 40 for receiving the captured optical image signal, the image sensor unit 60 for converting the input optical image signal into an electrical image signal, and outputting the image sensor unit 60. The image signal processor 80 converts the received electrical image signal into converted image data.

The lens unit 40 receives only an optical image signal of a wavelength band passing through the filter unit 20 when the filter unit 20 is positioned at the front end. Of course, when the filter unit 20 is moved to another position by the filter moving unit 160, the lens unit 40 will receive an optical image signal according to the conventional method.

The image sensor unit 60 outputs an electrical image signal (eg, RGB data) corresponding to the amount of light input through the lens for each unit pixel by using a sensor having a Bayer pattern. The image sensor unit 60 may be a charge coupled device (CCD) sensor or a complementary metal oxide semiconductor (CMOS) sensor.

The image signal processor 80 generates and outputs converted image data by using the electrical image signal input from the image sensor unit 60. The image signal processor 80 may be, for example, an image signal processor (ISP).

The converted image data may be, for example, YUV data. That is, the image signal processor 80 may generate YUV data using the electrical image signal and output the converted YUV data. The YUV method focuses on the fact that the human eye is more sensitive to brightness than color. The YUV method distinguishes colors into Y components of luminance and U and V components of chrominance. Since the Y component is sensitive to error, we code more bits than the color components U and V. A typical Y: U: V ratio is 4: 2: 2, and the converted YUV values are stored sequentially in the FIFO.

Alternatively, the converted image data may be, for example, image paper data encoded according to a predetermined method. To this end, the image signal processor 80 may further include an image codec and a scaler. The image codec performs a function of encoding original image data or decoding the compressed image data to original image data. At this time, any one of various image codecs, such as JPEG and MPEG, can be selected as an image codec. The scaler performs a function of scaling the original image data into image data having a size and the number of pixels that can be displayed on the display unit 240 described later. Of course, the scaler may be provided in the image analyzer 100.

In addition, the image signal processing unit 80 inputs a specific program (for example, a brightness control program, etc.) from the control unit 120 to facilitate the analysis of the characteristic vector of the digital image data in the image analysis unit 100 to be described later. The image data for the characteristic vector analysis may be generated by adjusting the brightness of the digital image data using the received information. Of course, the program may be pre-built. The digital image data processed by the image signal processor 80 may be generated by going through all or some of these processes.

The image analyzer 100 analyzes a feature vector of the input digital image data. The image analyzing unit 100 analyzes the pattern of the digital image data provided from the camera unit 40, analyzes the characteristic vector according to the change of the image pattern, and provides the analysis result to the controller 120 which will be described later. do. The image analyzing unit 100 may use a plurality of frames continuously input from the camera unit 40 to analyze the characteristic vector, and may use change information between the frames.

The controller 120 performs a function of controlling the overall operation of the mobile communication terminal. That is, the controller 120 compares the characteristic vector according to the change of the image pattern of the digital image data analyzed by the image analyzer 100 with the characteristic vector of the image pattern stored in the memory unit 180 to be described later, and determines the threshold. In the case of the characteristic vector in the value, a control signal for causing a corresponding menu function is output. In addition, a specific program for analyzing the characteristic vector of the digital image data stored in the program memory of the memory unit 180 is transmitted to the image signal processor 80. Of course, the program may already be embedded in the image analysis unit 100. In addition, the controller 120 controls the operations of the filter moving unit 160, the light source unit 140, the camera unit 280, and the image analyzing unit 100. For example, the controller 120 controls the filter moving unit 160 when the control command for general photographing is input from the image analyzing unit 100 or the keypad unit 260 to filter the filter unit 20 (or filter). May be removed at the front end of the lens unit 40.

The light source unit 140 performs a function of irradiating light of a specific wavelength to the indicating means (for example, a finger placed at a predetermined interval in front of the lens unit 40) by a control signal of the controller 120. The light irradiation angle of the light source unit 140 is set to an angle at which the irradiated light can be reflected to the indicating means. Therefore, when inputting a control signal, the indicating means may be limited in advance so as to be located within a predetermined interval of the front end of the lens unit 40, the light source 140 is reflected by the light irradiated by the indicating means located at the corresponding interval It may be formed at a light irradiation angle that can be input. The light source unit 140 may use a light emitting diode (LED) suitable for a characteristic wavelength passing through the filter unit 20. For example, if the filter unit 20 passes an infrared wavelength near 800 nm, an infrared LED may be used as the light source unit 140.

The memory unit 180 stores various programs for controlling the overall operation of the mobile communication terminal, data generated by program execution, captured image data, menu selection information corresponding to the characteristic vector and the characteristic vector of the image vector, and the like. . The memory unit 180 may be implemented as an integrated memory or divided into a plurality of memory units (for example, a program memory, a data memory, an image memory, etc.).

The data memory may store vector characteristics of image data corresponding to a menu function. The program memory may store a program that compares a feature vector of digital image data processed by the image signal processor 80 with a menu function stored in the data memory and a vector characteristic of the corresponding image data. The image memory may store the converted image data itself or digital image data whose image quality or size is adjusted through the image signal processor 80.

The wireless unit 200 performs a wireless communication function of the mobile communication terminal. The wireless unit 200 includes an RF unit and a wireless processing unit. The RF unit includes a radio frequency (RF) transmitter for upconverting and amplifying a frequency of a transmitted signal, an RF receiver for downconverting and low noise amplifying a frequency of a received signal. The wireless processing unit may be composed of a modem and a codec. The modem modulates and encodes a signal transmitted through the RF transmitter, and demodulates and decodes the signal received through the RF receiver. The codec includes a data codec for processing character and numeric data to be transmitted and received, an audio codec for processing voice data to be transmitted and received, and the like.

The handset 220 outputs the received voice data received from the audio codec of the wireless processor or transmits the transmitted voice data received through the microphone to the audio codec of the wireless processor.

The display unit 240 displays data corresponding to the operation state of the mobile communication terminal on the screen under the control of the controller 120. Here, the display unit 240 may be a liquid crystal display (LCD), organic light emitting diodes (OLED), or the like, and the display unit 240 may further include a separate display memory for storing processed image data. .

The keypad unit 260 includes one or more key buttons for allowing a user to select letters and numbers to be input. In addition, the keypad unit 260 further includes one or more function buttons for performing a function (for example, turn on of the mobile communication terminal and turn on of the light source unit 140) that cannot be recognized by the interpretation of the characteristic vector. It may also include. The keypad unit 260 may be implemented by, for example, a button method or a touch screen method.

2A and 2B illustrate a state of use of a contactless key input of a mobile communication terminal according to an exemplary embodiment of the present invention. Although FIG. 2A and FIG. 2B illustrate a cellular phone of a folding type, various information communication devices including a PDA may be used as a mobile communication terminal according to the present invention. , Flip type, etc.), of course. Of course, it is apparent that the contactless key input method according to the present invention may be used universally in various devices requiring key input in addition to the mobile communication terminal. In the case of FIG. 2B, overlapping descriptions of the same contents as those of FIG. 2A are omitted. 2A and 2B assume that a single camera unit 280 is shared for the purpose of menu function selection input and photographing, but it is obvious that the camera unit may be independently implemented for each purpose.

2A illustrates a state in which a contactless key is input to a mobile communication terminal using a specific portion of a human body according to an exemplary embodiment of the present invention.

Referring to FIG. 2A, the mobile communication terminal 300 according to the present invention includes a display unit 240, a light source unit 140, a filter unit 20, and a keypad unit 260.

The light source unit 140 emits light of a specific wavelength to the characteristic part (eg, finger end) 320 of the human body. The light source unit 140 provided at the position where the light reflected by the characteristic part of the human body is input to the lens unit 40 may be implemented as two as shown in FIG. 2A, but in addition, the same function may be performed. If it can be implemented so that the quantity of the light source unit 140 may vary from one to n (natural number).

The irradiated light of the specific wavelength is reflected by the characteristic part 320 of the human body and a part of the optical image signal reflected by the filter unit 20 is continuously input to the camera unit 280 (not shown). Of the reflected optical image signals, only the optical image signals of the wavelength band transmitted by the filter unit 20 are input to the camera unit 280, and are converted into converted image data (eg, YUV data or encoded image data). In each frame, the characteristic vector is interpreted to execute the corresponding menu function.

For example, when YUV data is used, a point represented by a specific luminance component in each frame may be interpreted, and a characteristic vector may be interpreted as a movement trajectory of the corresponding point in successive frames, and correspond to the analyzed characteristic vector. Stored menu functions can be executed. In addition, when the encoded image data is used, the position of the reflected light may be analyzed by a conventional image analysis method, and the characteristic vector may be interpreted as a movement trajectory within a frame in which the analyzed light position is continuous.

As shown in FIG. 2A, when one camera unit 280 is shared, the controller 120 uses the filter moving unit 160 (see FIG. 1) in order to use the camera unit 280 for the purpose of photographing (imaging device). ), Filter unit 20 should be removed from front of camera unit 280. Of course, the filter moving unit 160 may be omitted by including one more camera module for imaging.

The keypad unit 260 may be expressed in various ways such as a button method or a touch screen, and an directional key for executing a menu function may be omitted, so that the space of the keypad unit 260 may be efficiently arranged. However, at least one function button for performing a function (for example, turn on of the mobile communication terminal, turn on of the light source unit 140) that cannot be recognized by interpretation of the characteristic vector is provided on one side of the mobile communication terminal. It may be provided. Of course, when the mobile communication terminal is provided with a motion recognition sensor (for example, a motion recognition sensor), a function button for turning on the light source unit 140 may be omitted. For example, when shaking is detected twice within 1 second, it is sufficient to set in advance the light source unit 140 to be turned on.

2B is a view showing a state of contactless key input to the mobile communication terminal using the indicating means according to another embodiment of the present invention.

As shown in FIG. 2B, the mobile communication terminal does not include the light source unit 140, unlike in FIG. 2A, and the light emitting unit 350 may be formed at one end of the indicating unit 310. Light emitted from the light emitter 350 toward the lens unit 430 may be input to the camera unit 280 through the filter unit 20. Since the process after the filtered light is input to the camera unit 280 is as described above, the description thereof will be omitted. The light emitting unit 350 may be implemented with, for example, an LED, like the light source unit 140.

The indicating means 310 may be implemented in the form of a stylus pen, for example, and a space for accommodating the indicating means 310 may be formed at one side of the mobile communication terminal.

3 is a flowchart illustrating the overall flow of a method for recognizing a contactless key input according to an exemplary embodiment of the present invention.

In operation S360, the camera unit 280 is irradiated from the light source unit 140 included in the mobile communication terminal 300 and reflected from the specific part 320 of the human body or irradiated from the light emitting unit 350 of the indicating unit 310. The light corresponding to a specific wavelength band of light (that is, an optical image signal) is received. The selective transmission of only light corresponding to a specific wavelength band among the input light is processed by the filter unit 20. A separate function button is provided to start the operation of the light source unit 140 or the light emitting unit 350, or a motion sensor (motion sensor) for recognizing a movement of the pressure sensor or the mobile communication terminal is provided in the mobile communication terminal 300. It may be further included as described above. That is, when the pressure sensor at a predetermined position senses a physical contact, or when the motion recognition sensor recognizes a specific motion indicating the start of the input, the sensor transmits a predetermined detection signal to the controller 150. In this case, the specific operation for notifying the start of the input may be set by the user and may be set to recognize, for example, an operation of shaking the mobile communication terminal or holding and releasing the palm.

The pressure sensor or motion recognition sensor may be controlled by the controller 150 to not react to unintended physical contact of the user. That is, the controller 150 may be controlled such that a predetermined detection signal is not generated when the user performs a similar operation not intended by the user regardless of the purpose of starting the input. It may be possible, for example, by setting an effective range of pressure values applied to the contact sensor or by setting an effective intensity range of movement.

In operation S380, the image sensor unit 60 converts the filtered optical image signal into an electrical image signal and transmits the converted image signal to the image signal processor 80, and the image signal processor 80 uses the input electrical image signal. Generate the converted image data. In this case, the image signal processor 80 may generate optimal converted image data for the characteristic vector analysis under the control of the controller 120. In order to generate optimal converted image data, for example, brightness of digital image data and the like may be adjusted.

In operation S400, the image analyzing unit 100 analyzes the characteristic vector according to the change of the image pattern using the input converted image data and provides the analysis result to the control unit 120. In this case, difference information between frames continuously input through the camera unit 280 may be used to interpret a characteristic vector corresponding to the movement trajectory. Therefore, steps S360 to S380 may be repeated a plurality of times before step S400. For example, when the transformed image data for the characteristic vector analysis is generated in the image signal processor 80, the characteristic vector may be analyzed by analyzing the difference between the image pattern photographed at the reference time point and the image pattern photographed earlier. The direction of the characteristic vector may be determined by the movement of a specific part of the human body or the direction of movement of the indicating means 310. In this case, if the direction of the characteristic vector can be interpreted differently from the actual movement direction according to the curvature of a specific part of the human body, this mismatch may be defined in advance and the corresponding characteristic vector may be stored in the memory unit 180. There will be.

In operation S420, the controller 120 compares the feature vector according to the change of the image pattern analyzed by the image analyzer 100 with the feature vector of the image pattern previously stored in the memory unit 180 to determine whether the image is similar.

In operation S440, when the characteristic vector according to the change of the image pattern of the analyzed digital image data is compared with the characteristic vector of the image pattern stored in the memory unit 180, the process proceeds to step S460. The direction of the characteristic vector of the analyzed digital image data and a corresponding menu function may be set by the designer, such that a menu function corresponding to the input optical image signal is executed as illustrated in FIG. Can be set.

However, if the result of the determination in step S440 is not the characteristic vector in the threshold, the menu function is not executed, and the control unit 120 displays an error such as "incorrect input" or "please input again" on the display unit 240. You can display a message. Of course, since it may be a process of moving a specific part of the human body or the pointer 310 to execute a menu function as the case where the characteristic vector is not within the threshold value, the process proceeds to step S360 again, but the output of the error message may be omitted. .

In operation S460, when it is determined by the controller 120 that the characteristic vector is within the threshold value, a control signal corresponding thereto is output to execute a menu function.

Through steps S360 to S460 as described above, the user may operate various functions of the mobile communication terminal 300 by contactless key input using no keypad.

4 is a diagram illustrating waveforms of an optical image signal passing through a filter unit according to an exemplary embodiment of the present invention.

As shown in FIG. 4, the filter unit 20 passes only a specific wavelength band irradiated from the light emitting unit 350 of the light source unit 140 or the indicating unit 310, and filters the remaining wavelength band. In order to improve the recognition characteristic of the image analyzer 120, it may be desirable to set a narrow wavelength band to pass through.

The wavelength band passed (ie, the pass band) may be set by the designer according to the LED which may be a filter or a light emitting means used, and may vary depending on various design factors such as noise, power, and cost. For example, if the LED of the light source unit 140 is an infrared LED that irradiates infrared rays having good linearity and reflectivity better than visible light, the filter of the filter unit may use an infrared filter, and if the LED emits a specific wavelength in the visible light region, Suitable filters can be used.

5 illustrates an example of a menu function of a selected video signal according to an exemplary embodiment of the present invention.

Referring to FIG. 5, when the optical image signal that is continuously converted to digital image data is converted into digital image data, and the analyzed optical image signal draws a circle to the right or a circle to the left, the controller 120 Corresponds to a menu function, for example, to scroll down or up a menu, or to immediately execute a call function or a cancel function. At this time, the setting of the corresponding menu function can be set by the designer, and receives and executes a control signal of the controller 120 by a program stored in the memory unit 180. As another example, when the interpreted optical image signal indicates left and right or up and down, a menu may be selected or canceled or an address book or a control panel may be immediately executed.

Correlation between the feature vector and the menu function illustrated in FIG. 5 is only two examples among various embodiments, and it is obvious that various modifications are possible. In addition, it will be apparent to those skilled in the art that modifications may be made more diverse according to the characteristics of the electronic apparatus to which the present invention is applied.

As described above, according to the apparatus and the method of recognizing a contactless key input according to the present invention, a user can control a menu function using a camera imaging apparatus in place of a keypad for an electronic device having a conventional keypad. Remote control is more effective in using electronic devices.

In addition, the present invention can omit a part of the existing keypad, thereby increasing the spatial utilization of the electronic device, thereby simplifying the manufacturing process and reducing the manufacturing cost thereof.

In addition, the present invention has the effect of maximizing component utilization by making it possible to universally use the provided camera imaging device.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art that various modifications of the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below It will be appreciated that modifications and variations can be made.

Claims (9)

A filter unit passing only a specific wavelength band of the incident optical image signal; A camera unit for converting an optical image signal input through the filter unit into converted image data; An image analyzing unit which analyzes the characteristic vector using the converted image data continuously input from the camera unit; A controller for controlling a menu function assigned to a feature vector corresponding to the analyzed feature vector among prestored feature vectors; And Including a light source unit for irradiating the optical image signal, And an optical image signal input to the filter unit is light reflected by an external reflector among lights irradiated by the light source unit. delete The method of claim 1, And a light source unit having an arbitrary quantity of 1 to n (natural numbers) is formed on a circle centering on the camera unit. delete The method of claim 1, And a filter moving unit including a moving unit to remove the filter unit from the front end of the camera unit. (a) inputting an optical image signal having a specific wavelength filtered through a filter unit; (b) generating converted image data by using the input optical image signal having a specific wavelength; (c) analyzing a characteristic vector of the converted image data; (d) searching for a feature vector corresponding to the analyzed feature vector among previously stored feature vectors; And (e) executing a designated menu function for the retrieved feature vector; The optical image signal of the step (a) is a contactless key input method, characterized in that the light irradiated from the light source is reflected by the external reflector. The method of claim 6, Step (a) is a contactless key input method, characterized in that started by the control signal of the control unit by the detection of the key input device or sensor. delete delete

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