TWI610208B - Optical touch device and optical touch method - Google Patents

Abstract

An optical touch device includes an indication plane, an image sensing unit, a light source, and a processing unit, wherein the processing unit is electrically connected to the image sensing unit and the light source. The image sensing unit is disposed on one side of the indication plane. The image sensing unit senses an image of one of the objects on the indicating plane. The light source is disposed on one side of the indication plane. The processing unit analyzes the image to determine a first color of the object and controls the light source to emit light having a second color, wherein the first color is different from the second color.

Description

Optical touch device and optical touch method

The present invention relates to an optical touch device and an optical touch method, and more particularly to an optical touch device and an optical touch method that can increase the accuracy of touch determination.

At present, the optical touch device has advantages of lower cost and easier achievement than other touch technologies, such as resistive, capacitive, ultrasonic or projected image, especially in the field of large-sized touch display. The conventional optical touch device utilizes an image sensing unit to sense an object (eg, a finger or a stylus) at a touched position indicated on the indication plane. When the image sensing unit senses the object on the indication plane, the processing unit of the optical touch device can calculate the touch position indicated by the object. However, when the color of the object is similar to or the same as the color of the frame disposed around the indication plane, the foreground and the background in the image are difficult to distinguish, thereby reducing the accuracy of the touch determination.

One of the objectives of the present invention is to provide an optical touch device and an optical touch method that can increase the accuracy of touch determination to solve the above problems.

According to an embodiment, the optical touch device of the present invention comprises an indication plane, an image sensing unit, a light source and a processing unit, wherein the processing unit is electrically connected to the image sensing unit and the light source. The image sensing unit is disposed on one side of the indication plane. The image sensing unit senses an image of one of the objects on the indicating plane. The light source is disposed on one side of the indication plane. The processing unit analyzes the image to determine a first color of the object and controls the light source to emit light having a second color, wherein the first color is different from the second color.

According to another embodiment, the optical touch method of the present invention is applicable to an optical touch device. The optical touch device includes an indication plane, an image sensing unit, and a light source. The image sensing unit is disposed on one side of the indication plane. The light source is disposed on one side of the indication plane. The optical touch method includes the following steps: the image sensing unit senses an image of one of the objects on the indication plane; analyzes the image to determine a first color of the object; and controls the light source to emit light having a second color, wherein One color is different from the second color.

In summary, when the image sensing unit senses an image of an object on the indicating plane, the present invention first analyzes the image to determine the first color of the object (eg, red), and controls the light source to emit the first color. A light of a second color (for example, green) that is different. Then, the image sensing unit re-sensing the image of the object, and the foreground and the background in the image are clearly distinguished by the difference between the first color and the second color, thereby increasing the accuracy of the touch determination.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic diagram of an optical touch device 1 according to an embodiment of the invention, and FIG. 2 is an image I sensed by the image sensing unit 12 a in FIG. 1 . schematic diagram.

As shown in FIG. 1 , the optical touch device 1 includes an indication plane 10 , two image sensing units 12 a and 12 b , a light source 14 , a processing unit 16 , and a frame 18 . The processing unit 16 is electrically connected to the image sense. The measuring unit 12a, 12b and the light source 14. The image sensing units 12a, 12b are disposed on one of the indication planes 10 side. The frame 18 is disposed around the indication plane 10, and the light source 14 is disposed on the frame 18. In other words, the light source 14 is also disposed on one side of the indication plane 10. In this embodiment, the light source 14 can include a plurality of light emitting units 140, wherein the light emitting units 140 can be spaced apart on the bezel 18 such that the light source 14 and the bezel 18 form a light bar. It should be noted that the number and arrangement of the light-emitting units 140 may be determined according to actual applications, and are not limited to the embodiments illustrated in the drawings.

In practical applications, the indication plane 10 can be a display panel (eg, a liquid crystal display panel), a whiteboard, a blackboard, a projection screen, or other plane for the user to perform a touch operation; the image sensing units 12a, 12b can be charge coupled components. (Charge-coupled Device, CCD) sensor or Complementary Metal-Oxide Semiconductor (CMOS) sensor, but not limited to this: the light-emitting unit 140 can be a light-emitting diode or other light-emitting device The processing unit 16 can be a processor or controller with data manipulation/processing functions. In general, the optical touch device 1 is also provided with soft and hard components necessary for operation, such as a circuit board, a power supply, an application, a communication module, etc., depending on the actual application.

As shown in FIG. 1 , the user can perform a touch operation on the indicator plane 10 , wherein the object 3 can be a finger, a stylus or other touch object. At this time, the image sensing unit 12a, 12b senses an image of the object 3 on the indication plane 10. Taking the image sensing unit 12a as an example, the image I sensed by the image sensing unit 12a is as shown in FIG. In this embodiment, the image I may include a border image area I1 and a borderless image area I2, wherein the border image area I1 corresponds to the space formed by the frame 18, and the borderless image area I2 corresponds to the frame 18 relative to the indication plane 10. Space. It should be noted that the image sensing unit 12b senses that the image system of the object 3 on the indication plane 10 is similar to the image I shown in FIG. 2, and details are not described herein again.

Next, the processing unit 16 analyzes the image I to determine a first color of the object 3, and controls the light source 14 to emit light having a second color, wherein the first color is different from the second color. In this embodiment, the processing unit 16 can analyze at least one of the borderless image area I2 and the border image area I1 of the image I to determine the first color of the object 3. Then, the image sensing unit 12a, 12b re-sensing the image of the object 3, and clearly distinguishes the foreground and the background in the image by the difference between the first color and the second color, thereby increasing the accuracy of the touch determination. degree. In this embodiment, the first color and the second color may be contrast colors, such as red and green, to increase the color contrast between the object 3 and the background in the image.

It should be noted that the image sensed by the image sensing unit 12a, 12b may only include the above-mentioned frame image area. At this time, the processing unit 16 analyzes the border image area of the image to determine the first color of the object.

In this embodiment, the processing unit 16 can analyze the image I to determine the position of the object 3 relative to the frame 18, and control at least one of the light-emitting units 140 corresponding to the position of the object 3 to emit light having the second color. As shown in FIG. 1, after determining the position of the object 3 relative to the frame 18, for the image sensing unit 12a, the processing unit 16 can control the light-emitting unit 140 in the area A1 of the position of the corresponding object 3 to emit light having the second color. For the image sensing unit 12b, the processing unit 16 can control the light emitting unit 140 in the area A2 of the position of the corresponding object 3 to emit light having the second color, so that the image sensing unit 12a, 12b senses the image. An obvious color contrast can be produced between the object 3 and the background, thereby increasing the accuracy of the touch determination. Thereby, the processing unit 16 can calculate the touch position of the object 3 by using the general touch algorithm according to the image sensed by the image sensing units 12a and 12b.

In this embodiment, the processing unit 16 may analyze the image I to determine a width W of the object 3, and control at least one of the light emitting units 140 to emit light having the second color according to the width W. For example, the area A1 shown in FIG. 1 may have a width of 2 W, and the area A2 shown in FIG. 1 may have a width of 1.5 W. Therefore, the present invention can determine which of the light-emitting units 140 emit light having the second color according to the width W of the object 3.

Please refer to FIG. 3, which is a schematic diagram of an optical touch device 1' according to another embodiment of the present invention. The main difference between the optical touch device 1 and the optical touch device 1' is that the light source 14' of the optical touch device 1' is disposed adjacent to the image sensing units 12a, 12b, as shown in FIG. In this embodiment, the light source 14' can be a light emitting diode or other light emitting device. When the light source 14' is disposed adjacent to the image sensing units 12a, 12b, the bezel 18 may be a reflective bezel or a light absorbing frame, depending on the actual application.

As shown in FIG. 3, the user can perform a touch operation on an indication plane 10, wherein the object 3 can be a finger, a stylus or other touch object. At this time, the image sensing unit 12a, 12b senses an image of the object 3 on the indication plane 10. Next, the processing unit 16 analyzes the image to determine a first color of the object 3, and controls the light source 14' to emit light having a second color, wherein the first color is different from the second color. After the light emitted by the light source 14' is irradiated on the object 3 and the frame 18, the image sensing unit 12a, 12b senses an apparent color contrast between the object 3 and the background, thereby increasing the touch judgment. Accuracy.

Please refer to FIG. 4, which is a flow chart of an optical touch method according to an embodiment of the invention. The optical touch method in FIG. 4 can be implemented by using the optical touch device 1, 1' described above. First, in step S10, the image sensing units 12a, 12b sense images about the object 3 on the pointing plane 10. Next, step S12 is performed to analyze the image to determine the first color of the object 3. Next, step S14 is executed to control the light sources 14, 14' to emit light having a second color, wherein the first color is different from the second color. It should be noted that the detailed embodiments of the optical touch method of the present invention are as described above, and are not described herein again. In addition, each part or function in the control logic of the optical touch method shown in FIG. 4 can be realized by a combination of hardware and software.

In summary, when the image sensing unit senses an image of an object on the indicating plane, the present invention first analyzes the image to determine the first color of the object (eg, red), and controls the light source to emit the first color. A light of a second color (for example, green) that is different. Then, the image sensing unit re-sensing the image of the object, and the foreground and the background in the image are clearly distinguished by the difference between the first color and the second color, thereby increasing the accuracy of the touch determination. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

1, 1'‧‧‧ optical touch device

3‧‧‧ objects

10‧‧‧ indicating plane

12a, 12b‧‧‧ image sensing unit

14, 14'‧‧‧ Light source

16‧‧‧Processing unit

18‧‧‧Border

140‧‧‧Lighting unit

A1, A2‧‧‧ area

I‧‧‧ images

I1‧‧‧Border image area

I2‧‧‧Borderless image area

W‧‧‧Width

S10-S14‧‧‧Steps

FIG. 1 is a schematic diagram of an optical touch device according to an embodiment of the invention.

FIG. 2 is a schematic diagram of an image sensed by the image sensing unit in FIG. 1.

FIG. 3 is a schematic diagram of an optical touch device according to another embodiment of the present invention.

4 is a flow chart of an optical touch method according to an embodiment of the invention.

S10-S14‧‧‧Steps

Claims (14)

An optical touch device includes: an indicating plane; an image sensing unit disposed on one side of the indicating plane, the image sensing unit sensing an image of an object on the indicating plane; a light source, setting And a processing unit electrically connected to the image sensing unit and the light source, the processing unit analyzing the image to determine a first color of the object, and controlling the light source to emit a first a light of two colors, the first color being different from the second color. The optical touch device of claim 1, wherein the first color and the second color are contrast colors. The optical touch device of claim 1, wherein the light source is disposed adjacent to the image sensing unit. The optical touch device of claim 1, further comprising a frame disposed around the indication plane, the light source being disposed on the frame. The optical touch device of claim 4, wherein the light source comprises a plurality of light emitting units, the light emitting units are spaced apart on the frame, and the processing unit analyzes the image to determine a position of the object relative to the frame, and At least one of the illumination units that control the location of the object emits light having the second color. The optical touch device of claim 5, wherein the processing unit analyzes the image to determine a width of the object, and controls at least one of the light emitting units to emit light having the second color according to the width. The optical touch device of claim 4, wherein the image comprises a border image area and a borderless image area, wherein the border image area corresponds to a space formed by the border, and the borderless image area corresponds to the indication The processing unit analyzes at least one of the borderless image area of the image and the border image area to determine the first color of the object. An optical touch device is applicable to an optical touch device. The optical touch device includes an indication plane, an image sensing unit, and a light source. The image sensing unit is disposed on one side of the indication plane, and the light source is disposed. On one side of the indication plane, the optical touch method includes the following steps: the image sensing unit senses an image of an object on the indication plane; analyzing the image to determine a first color of the object; The light source is controlled to emit light having a second color, wherein the first color is different from the second color. The optical touch method of claim 8, wherein the first color and the second color are contrast colors. The optical touch method of claim 8, wherein the light source is disposed adjacent to the image sensing unit. The optical touch method of claim 8, wherein the optical touch device further comprises a frame disposed around the indication plane, the light source being disposed on the frame. The optical touch method of claim 11, wherein the light source comprises a plurality of light emitting units, and the light emitting units are arranged on the frame at intervals. The optical touch method further comprises the following steps: analyzing the image to determine that the object is relatively a position of the one of the frames; and at least one of the light-emitting units that control the position of the object to emit light having the second color. The optical touch method of claim 12, further comprising the steps of: analyzing the image to determine a width of the object; and controlling at least one of the light emitting units to emit light having the second color according to the width . The optical touch method of claim 11, wherein the image comprises a border image area and a borderless image area, wherein the border image area corresponds to a space formed by the border, and the borderless image area corresponds to the indication The optical touch method further includes the following steps: analyzing at least one of the borderless image area of the image and the border image area to determine the first color of the object.