INFRARED SENSING GESTURE RECOGNITION METHOD

Abstract

An infrared sensing gesture recognition method, characterized in that the recognition method adopts multiple infrared light emitting units, and each infrared light emitting unit is loaded with pulse signals on different frequencies, then, one or more infrared receiving units for receiving signals are used to receive infrared reflected signals loaded with corresponding frequencies emitted from different infrared light emitting units, and the infrared reflected signal corresponds to the infrared light emitting unit with the corresponding frequency by identifying the frequency of pulse signal loaded in the infrared reflected signal, so as to determine the physical location of infrared light emitting unit, and to judge the movement trajectory of gesture.

Claims

1. An infrared sensing gesture recognition method, characterized in that the recognition method adopts multiple infrared light emitting units, and each infrared light emitting unit is loaded with pulse signals on different frequencies, then, one or more infrared receiving units for receiving signals are used to receive infrared reflected signals loaded with corresponding frequencies emitted from different infrared light emitting units, and the infrared reflected signal corresponds to the infrared light emitting unit with the corresponding frequency by identifying the frequency of pulse signal loaded in the infrared reflected signal, so as to determine the physical location of infrared light emitting unit, and to judge the movement trajectory of gesture.

2. The infrared sensing gesture recognition method according to claim 1, wherein two infrared light emitting units are used and one infrared receiving unit is used.

3. The infrared sensing gesture recognition method according to claim 1, wherein the infrared light emitting units are distributed in an array, the infrared receiving unit is located in a middle of the array distributed infrared light emitting units.

4. The infrared sensing gesture recognition method according to claim 1, wherein the infrared light emitting unit includes an infrared transmitting tube, a signal amplifying circuit and a modulation circuit, the pulse signal on specific frequency is imported through the modulation circuit, and loaded to the infrared transmitting tube through the signal amplifying circuit, so that the infrared transmitting tube emits the infrared signal with the specific frequency.

5. The infrared sensing gesture recognition method according to claim 1, wherein the infrared receiving unit includes an infrared receiving tube, a signal amplifying circuit and a modulation circuit; when the reflected infrared signal is received by the infrared receiving tube, the signal is amplified by the signal amplifying circuit, and then the amplified signal is fed into the demodulation circuit, the corresponding frequency is obtained by demodulation, which infrared emission unit the infrared signal comes from can be determined according to the frequency, so as to implement signal identification.

6. The infrared sensing gesture recognition method according to claim 1, wherein the judgment of movement trajectory of gesture is combined with the following parameters, the time and duration of infrared receiving unit receiving an infrared reflected signal, so as to determine the starting time and duration of a movement trajectory of gesture.

7. The infrared sensing gesture recognition method according to claim 4, wherein the infrared transmitting tube in the infrared light emitting unit is an infrared LED element.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is a schematic diagram of a first embodiment of the present invention;

[0019] FIG. 2 is a circuit schematic diagram of an infrared transmitting unit according to the first embodiment of the present invention;

[0020] FIG. 3 is a circuit schematic diagram of an infrared receiving unit according to the first embodiment of the present invention;

[0021] FIG. 4 is a schematic diagram of a second embodiment of the present invention;

[0022] FIG. 5 is a schematic diagram of a third embodiment of the present invention;

[0023] FIG. 6 is a schematic diagram of a fourth embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0024] The details of the present invention are described with the figures below.

[0025] FIG. 1 shows the Embodiment 1 of the present invention, there are two infrared light emitting units in this case, the infrared is emitted usually by infrared transmitting tube. There is one infrared receiving unit, the reflected infrared is received usually by infrared receiving tube. In the infrared emission unit, two infrared transmitting tubes are loaded with different frequency pulses (f1, f2) to emit different infrared signals, the infrared receiving tube detects whether there is a hand or not. If a hand occurs, when the infrared receiving tube receives the infrared signals on frequencies f1 and f2, the infrared signals on different carrier frequencies are identified through circuit, the infrared transmitting tubes in different physical locations are confirmed, the direction of movement of hand is judged according to the time sequence of infrared reflection and infrared emission position.

[0026] Certainly, the following parameters are considered in judging the movement trajectory of gesture, the time and duration of infrared receiving unit receiving an infrared reflected signal, so as to determine the starting time and duration of a movement trajectory of gesture. The time parameter is combined with the afore the physical location, the movement direction, travelling speed and stay time of gesture can be judged, so as to implement the judgment and recognition of different gestures.

[0027] As shown in FIGS. 2 and 3, in Embodiment 1, the infrared light emitting unit comprises an infrared transmitting tube, a signal amplifying circuit and a modulation circuit, a pulse signal on specific frequency is imported through the modulation circuit, and loaded to the infrared transmitting tube through the signal amplifying circuit, so that the infrared transmitting tube emits infrared signals with the specific frequency. The infrared transmitting tube in the infrared light emitting unit is an infrared LED element.

[0028] Further, the infrared receiving unit comprises an infrared receiving tube, a signal amplifying circuit and a modulation circuit. When the reflected infrared signal is received by the infrared receiving tube, the signal is amplified by the signal amplifying circuit, and then the amplified signal is fed into the demodulation circuit, the corresponding frequency is obtained by demodulation, which infrared emission unit the infrared signal comes from can be determined according to the frequency, so as to implement signal identification.

[0029] FIG. 4 shows Embodiment 2 of the present invention, two infrared light emitting units coordinate with one infrared receiving unit in this case to describe the operating principle. First of all, the infrared LED in the two infrared light emitting units is loaded with pulses on different frequencies (f1 and f2) to emit the corresponding infrared signals. When the hand moves from left to right above, the hand first reflects the infrared signal on frequency f1. When the infrared receiving tube in the infrared receiving unit receives the signal, the signal on frequency f1 is identified first. When the hand moves somewhere about the infrared LED2 light source, the infrared signal on frequency f2 is reflected, and then the signal on frequency f2 is identified by circuit, the left to right movement of hand can be judged by judging different frequencies and the occurrence time sequence. When the hand moves from right to left, the principle is similar. Certainly, more infrared light emitting units and infrared receiving units are allowed.

[0030] FIG. 5 shows Embodiment 3 of the present invention, the infrared light emitting units are distributed in array in this case, the infrared receiving unit is located in the middle of the infrared light emitting units distributed in array. In this embodiment, the infrared transmitting tube in the infrared light emitting unit is infrared LED element, and the infrared receiving tube in the infrared receiving unit is an infrared sensor. The LED element and infrared sensor are directly integrated into the circuit board.

[0031] The array distributed infrared light emitting units in this case can implement the hand in different directions (up-down movement, left-right movement) and more complex (rotation, hovering) multi-trajectory direction of movement. The operating principle is that the infrared LED1-LED8 are loaded with pulse signals on frequencies f1-f8, when the hand is moving above, the infrared sensor receives signals, which are identified to determine the movement direction of hand. The effective area of matrix gesture recognition is enlarged by increasing the number of infrared sources (n, n shall not be smaller than 3). Therefore, more complex gestures can be identified, at least 2n (n is the number of infrared sources, n shall not be smaller than 3) gestures can be identified, applicable to more scenes.

[0032] As shown in FIG. 6, the array distributed infrared light emitting units can implement different gestures. [0033] LED1->LED2->LED3, LED1->LED4->LED6, LED1->LED5, implementing linear detection of gesture; [0034] LED1->LED2->LED5->LED8, implementing gesture rotation detection; [0035] LED1->LED7->LED8, implementing gesture turning detection.

[0036] As stated above, when the time parameter is applied, more complex hovering detection can be implemented.

[0037] The embodiments of the present invention do not limit the scope of the present invention, any equivalent changes or modifications according to the structure and method of the present invention shall be covered within the scope of the present invention.