KR20120047746A - Virture mouse driving method - Google Patents

Abstract

PURPOSE: A virtual mouse driving method is provided to implement a virtual mouse system which is accurately operated in a general environment. CONSTITUTION: A plurality of images is inputted from a camera. The difference image is extracted between a plurality of images. A virtual mouse is operated based on the extracted difference image. The difference image is consecutively extracted from a plurality of images. A location of thumb or index finger is analyzed from the consecutively difference image.

Description

Virtual mouse driving method {Virture mouse driving method}

The present invention relates to a virtual mouse driving method, and more particularly, to a method of driving a virtual mouse using image information of a hand obtained from an image camera.

As display devices have evolved into smart systems, interaction with display devices has become important. Smart display devices should be able to input commands according to their position on the display device screen, similar to a computer. The input device most commonly used as a means for inputting such a command is a mouse. In addition, in the case of smart phones that are in the spotlight recently, a command input according to a position on a screen may be performed using a touch screen.

The input method using a conventional touch screen for giving a location-based command transmits a command through contact with a display device, causing various limitations. That is, it can be used only when the display device is within a reachable distance by hand. Also, the mouse is not a smart input tool because it has a physical size and shape.

Recently, input devices capable of transmitting commands to a display device such as a virtual mouse in a non-contact manner have emerged. In particular, in the game field, a method for transmitting a command through motion recognition using a 3D camera has been developed. The method of using the 3D camera has an advantage of easily separating the object image and the background image from which the gesture is performed from the input image, but the input device is complicated and expensive. In addition, since the resolution is low, a user must input a command using a large operation, which causes a great inconvenience for the user.

Meanwhile, the prior art related to the virtual mouse includes Korean Patent Publication No. 2007-0030398, Korean Registered Patent No. 0687737, Korean Patent Publication No. 2008-0050218, and the like. The patents propose methods for realizing the role of a virtual mouse by recognizing a gesture of one or both hands from an image input to a camera. At this time, in the recognition method, since a specific command is recognized by using the stationary shape of the finger, it is necessary to separate the fingers and the background image in order to recognize the stationary shape of the finger. The process of separating the hand region from the background image by using the information is essential. In this case, the absolute value of the color of the hand should be used. Since the color of the hand is different for each person, a sophisticated model registration process and recognition work should be performed. Difficult to solve, there is a problem that is difficult to implement in a general environment with disturbance rather than a well-organized laboratory environment.

Therefore, there is a need for the development of a new method for driving a virtual mouse that can be implemented even in a general environment with a certain disturbance regardless of human skin color.

The present invention has been made to solve the above problems, an object of the present invention is to provide a new method for driving a virtual mouse that can be implemented even in a general environment with a certain disturbance regardless of human skin color.

In order to achieve the above object, the virtual mouse driving method according to the present invention is a method for driving a virtual mouse controlled based on the change of the shape of the hand, the step of receiving a plurality of images captured at different times in the image camera And extracting a difference image between the plurality of images, and driving the virtual mouse based on the extracted difference image.

According to the present invention, it is preferable to extract motion information of the user's thumb and index finger from the difference image and to use the motion information as a click signal of the virtual mouse.

According to the present invention, it is preferable to extract the motion image from the plurality of images continuously and to extract the motion information by analyzing the change of the position of the thumb or the index finger in the continuous difference image. .

In addition, according to the present invention, it is preferable to recognize the number of times the thumb and the index finger stick and fall and use it as a specific command signal.

According to the present invention having the above-described configuration, it is possible to implement a virtual mouse system that is driven accurately even in a general environment regardless of the skin color of the person and to some extent disturbance.

1 is a schematic block diagram of an apparatus for implementing a virtual mouse driving method according to an embodiment of the present invention.
FIG. 2 is a schematic flowchart illustrating a process of the hand gesture recognition unit illustrated in FIG. 1.
3 is a diagram for explaining a difference image.
4 and 5 are diagrams illustrating a series of images and a difference image accordingly.

Hereinafter, a method of driving a virtual mouse according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram of an apparatus for implementing a virtual mouse driving method according to an embodiment of the present invention, and FIG. 2 is a schematic flowchart illustrating a process of the hand gesture recognition unit illustrated in FIG. 1. . 3 is a diagram for explaining a difference image, and FIGS. 4 and 5 are views illustrating a continuous image and a difference image according thereto.

1 to 5, first, the virtual mouse driving method according to the present embodiment is implemented in a virtual mouse system. The virtual mouse system 100 includes a camera 10, an image input unit 20, and a hand gesture recognition unit. 30, and the command transmission unit 40.

The camera 10 captures and outputs an image input from a lens through an imaging device such as a CCD or a CMOS, and may be implemented as, for example, a digital camera. The camera 10 captures an image of a user's hand and transmits the image to a video input unit. .

The image input unit 20 receives an image captured by the camera in real time.

The gesture recognition unit 30 extracts a difference image from an image input to the image input unit. The difference image is an image processing method for separating an object from a 2D image. The difference image is an image in which only two images are displayed by comparing two images. That is, when comparing the images of (a) and (b) of Figure 3 there is a change only in the position of the index finger, therefore, the difference image of (a) and (b) of Figure 3 is expressed as shown in (c) of FIG. do. Then, the motion information extracted from the user's thumb and index finger is extracted from the thus obtained car image, and the motion information is transmitted to the command transmitter.

In this case, when only one difference image obtained from two images is used as shown in FIG. 3, it is difficult to determine whether the thumb and the index finger are separated from each other and vice versa. Therefore, from the plurality of images, for example, images captured at five viewpoints as shown in (a) of FIG. 4, four consecutive difference images are secured as shown in (b) of FIG. 4. Comparing the position of the index finger changes, you can check whether the thumb and index finger is attached or falling. Looking at Figure 4 (b), the index finger is confirmed that the position changes to the bottom (thumbs side), in this case, the thumb and index finger is stuck in the state apart. On the contrary, in FIG. 5B, since the index finger changes its position upward, the index finger falls in the state where the thumb and index finger are attached.

By using a plurality of successive car images as described above, the motion information of the thumb and the index finger can be obtained more accurately. In addition, since the direction of the finger movement is confirmed through a plurality of difference images, even if there is some external disturbance, it can be excluded, and accurate movement information can be obtained (in the case of disturbance, since there is no direction such as a finger, it can be excluded). Also, disturbance can be eliminated by analyzing the size, angle, and shape of the difference image).

On the other hand, according to the hand motion can be obtained a variety of different types of car image, in the present embodiment, the thumb and index finger attached and falling, the reason is as follows. First, since the operation of attaching the thumb and the index finger is extremely difficult to occur in a general state, it can be easily distinguished from other general operations and has a low probability of recognition error. It is also suitable for image processing because it generates a certain difference image. In addition, since the operation is simple, even if the user repeatedly performs the repeated operation for a long time there is an advantage that is not difficult or tired.

In addition, the hand gesture recognition unit 30 continuously tracks the whole or part of the image of the hand to implement the movement of the mouse. This is a general method used for image tracking. It sets the tracking target image (tracking area) to all or part of the hand, then sets the space to move to and finds the position where the hand moves when the most similar position is found in the space. If this is done continuously, it becomes a movement signal for implementing the movement operation of the virtual mouse. Since the movement method of the virtual mouse is a well-known method, further description thereof will be omitted.

The command transmitter 40 outputs a driving signal corresponding to the information output from the hand gesture recognition unit, that is, the hand movement (mouse position movement) and the finger movement information (mouse click), thereby driving the virtual mouse. do. For example, once a finger is attached and released, a click signal for clicking the mouse is output.

If the finger is attached and dropped twice, it can be used as a signal indicating the initial start time of the input device. That is, there is a difficulty in defining an initial start time in implementing an input device using motion recognition. The existing method for knowing the initial start time is to display the area on the screen in advance, and recognize it as the initial start time when hands are matched within the area display. However, this approach requires sophisticated operations for the user to place his hand within the area of the screen, thus requiring a lot of time to start the system. However, when the thumb and the index finger are attached and dropped twice as in this embodiment, the initial start time can be quickly recognized.

In addition, in order to distinguish between a drag operation that moves while clicking the mouse and a movement that does not click, it is possible to recognize whether the thumb and the index finger move or move away from each other, and output a driving signal accordingly. In other words, if the user clicks the button of the virtual mouse and moves it as a gesture of attaching and moving a finger, and recognizes the movement of the mouse without clicking the button of the virtual mouse as a gesture of releasing a finger, the drag operation can be performed. have.

In addition, in order to effectively control the display device, an operation other than the basic operation of the mouse may be required. For example, you may need to adjust the volume or return to the main menu screen. In this case, various commands can be defined by recognizing the number of click motions (finger motion). For example, if you click three times, you can return to the main menu screen.

As described above, the virtual mouse driving method according to the present embodiment basically extracts the motion information of the hand using the difference image. Therefore, it is not affected by the color of the skin, so no model registration is required for the user, and there is no problem of recognition error according to race. In addition, it is not affected by the color of the surrounding environment or the brightness of the light, and can effectively implement the virtual mouse system in a general environment with some disturbance.

In addition, since the use of the thumb and index finger movement, even if the user repeatedly performs the repeated operation is not difficult or tired, it can be easily distinguished from other other operations, so the possibility of recognition error is low.

Although the preferred embodiments of the present invention have been shown and described above, the present invention is not limited to the specific preferred embodiments described above, and the present invention belongs to the present invention without departing from the gist of the present invention as claimed in the claims. Various modifications can be made by those skilled in the art, and such changes are within the scope of the claims.

100 ... virtual mouse system 10 ... camera
20 Video input unit 30 Hand gesture recognition unit
40.Command Delivery

Claims (6)

In the method for driving a virtual mouse controlled based on the shape change of the hand,
Receiving a plurality of images captured at different viewpoints by the camera;
Extracting a difference image between the plurality of images;
And driving the virtual mouse based on the extracted difference image. The method of claim 1,
Extracting the movement information of the user's thumb and some of the fingers except the thumb sticking and falling from the difference image, and using the movement information as a click signal of the virtual mouse . The method of claim 2,
The motion information is a virtual mouse driving method, characterized in that the thumb and index finger sticks and falls. The method of claim 3,
And extracting the motion image from the plurality of images, and extracting the motion information by analyzing the change of the position of the thumb or the index finger in the continuous difference image. . The method of claim 3,
Recognizing the number of times that the thumb and the index finger is attached and dropped using a specific command signal driving method. The method of claim 3,
The position movement of the user's hand is calculated and used as a movement signal of the virtual mouse,
The thumb and the index finger to move the state is used as a signal to move while clicking the button of the virtual mouse,
The thumb and the index finger is moved away from the virtual mouse driving method, characterized in that used as a signal to move without clicking the button of the virtual mouse.

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