TW201300725A - A position-sensing apparatus - Google Patents

Abstract

A position-sensing apparatus for detecting at least one object in a region is provided. The position-sensing apparatus includes a scanning light source, two image sensors, and a processor. The scanning light source generates a plurality of scanning beams based on a predetermined method. When the position-sensing apparatus starts to detect an object, the scanning light source sequentially generates a plurality of light points by the plurality of scanning beams in the region. The image sensors respectively sense the plurality of light points and correspondingly generate an image signal. The processor receives and processes the image signals to obtain a depth map information of the object.

Description

Somatosensory detection device

The present invention relates to a detecting device, and more particularly to a body sensing device.

With the advancement of optoelectronic technology, the body is the controller is no longer a distant dream. With the movement of the limbs of the body, the user can operate the electronic product equipped with 3D motion sensing technology more intuitively and conveniently. Users can control products such as TVs, computers and home appliances as long as they move their limbs in space.

In the 3D motion sensing technology, the core technology is the somatosensory detection method, and the performance of the somatosensory detection device that performs the method also has a decisive influence on the application of the somatosensory detection. In the prior art, there are those who use the time of flight or the object scale to perform the body-sensing detection. However, if the circuit structure is too complicated, it is not suitable for optics. Sensing application. In addition, the conventional technology also uses a laser as its detection light source, but the laser light source must be distributed in the entire detection area at the same time after the light splitting, so the power required is high, so the somatosensory detection is applied at the time of application. The power consumption of the measuring device is also relatively high.

Therefore, it is necessary to provide a body sensing device having a simple circuit structure and low power consumption characteristics.

The invention provides a body feeling detecting device, which has the characteristics of simple circuit structure and low power consumption.

The invention provides a body sensing device adapted to detect at least one object to be tested in an area. The somatosensory detection device includes a scanning light source, two image detectors, and a processor. The scanning light source produces a plurality of scanning beams in accordance with a predetermined pattern. When the body sensing device detects at least one object, the scanning light source generates a plurality of light spots by sequentially scanning the light beam in the region. The image detector detects the light spots and generates an image signal. The processor receives and processes the image signal to obtain a depth map/depth image information of the object.

In an embodiment of the invention, the scanning light source comprises a light source generating module and a mirror module. The light source generating module produces a parallel beam. The mirror module receives the parallel beams and reflects the parallel beams according to a predetermined pattern to produce a scanning beam.

In an embodiment of the invention, the light source generating module is switched according to a specific frequency to generate a parallel beam.

In an embodiment of the invention, the mirror module reflects a parallel beam according to a Lissajous scan, a Raster scan or a Zigzag scan to generate a scanning beam. .

In an embodiment of the invention, the mirror module comprises a MEMS Scanning Mirror.

In one embodiment of the invention, the scanning source described above produces at least one scan pattern in the region. The processor processes the image signal with reference to the scan pattern to obtain depth map information.

In an embodiment of the invention, the processor uses one of the image detectors to identify a Region of Interest (ROI) of the at least one object.

In an embodiment of the invention, when the scanning light source detects the object, the light spot is generated by sequentially scanning the light beam to the region of interest.

In an embodiment of the invention, the scanning light source generates at least one scan pattern in the region of interest. The processor processes the image signal with reference to the scan pattern to obtain depth map information.

The above described features and advantages of the present invention will be more apparent from the following description.

FIG. 1 is a schematic structural diagram of a body sensing device according to an embodiment of the invention. Referring to FIG. 1 , the body sensing device 100 of the present embodiment includes a scanning light source 110 , two image detectors 120 a and 120 b , and a processor 130 . In this embodiment, when the body sensing device 100 detects an object to be tested, the scanning light source 110 projects a plurality of scanning beams L2 into the detection area thereof. The object in the detection area, in particular, when the object to be tested exists in the detection area, the scanning beam L2 will sequentially generate a plurality of light spots on the object to be tested in the detection area, and the image is generated by the image. The detectors 120a, 120b detect the light spots, so that the processor 130 can obtain a depth map/depth image information to be measured by using a calculation method such as a triangulation method in subsequent calculations. .

It should be noted that, in this embodiment, a screen 200 is disposed in the detection area of the somatosensory detecting device 100. When the scanning light beam L2 of the scanning light source 110 is projected on the detection area, it can generate a plurality of light spots on the screen 200, and the image displayed in the screen 200 is generated by the scanning light source 110 in the detection area. A scan pattern 210. It should be noted that the screen 200 is not a necessary device of the present invention. The screen 200 presented in FIG. 1 is for convenience of explanation and is not intended to limit the present invention.

In this embodiment, the scanning light source 110 includes a light source generating module 112 and a mirror module 114 for generating a scanning beam L2 according to a predetermined manner. The light source generating module 112 includes, for example, a light source such as a laser or a light emitting diode to generate a parallel light beam L1. In the present embodiment, the so-called "parallel beam" is, for example, a parallel beam generated by a laser diode after being modulated by a controller, or, for example, a light-emitting diode is excited, and is supplemented by a lens. The parallel beam produced. The mirror module 114 is configured to receive the parallel beam L1 and reflect the parallel beam L1 according to the predetermined manner to generate the scanning beam L2. Here, the mirror module 114 is implemented, for example, by a MEMS Scanning Mirror or a Galvanometer Mirror. In the exemplary embodiment below, the mirror module 114 will be described with a microelectromechanical scanning galvanometer, but the invention is not limited thereto.

FIG. 2 is a schematic diagram showing the architecture of a mirror module in different viewing angles according to an embodiment of the invention. Referring to FIG. 1 and FIG. 2, in the embodiment, the mirror module 114 implemented by the microelectromechanical scanning galvanometer can be freely twisted with respect to the x direction and the y direction axis, except for the small size. In addition, there is a considerable optical scanning full angle. Therefore, with the axis of the x-direction and the y-direction twisted, the scanning light source 110 can perform a large scan in the detection area. The scanning characteristics change with the frequency of the axis twisting.

It should be noted that the mirror module 114 of the embodiment is implemented by a microelectromechanical scanning galvanometer. Therefore, the scanning light source 110 does not need to project the entire detection area, but is multi-point continuous scanning. The detection area is scanned so that the scanning light source 110 can be driven with less energy, and the average power consumption is relatively low. In addition, the multi-point continuous scanning method, the somatosensory detecting device 100 of the embodiment does not need to perform the focusing step when detecting.

In the present embodiment, the mirror module 114 reflects the parallel beam L1 according to a Lissajous scan method to generate the scanning beam L2. Therefore, when the scanning beam L2 is projected onto the screen 200, it can correspond to a specific Lissajous figure. The appearance of the Li Saiyu pattern differs depending on the setting of the scanning frequency of the mirror module 114 in the x direction and the y direction and the phase difference between the two, as shown in FIG.

FIG. 3 is a diagram showing the Li Saiyu pattern generated on the screen by the mirror module according to an embodiment of the invention. Please refer to FIG. 1 and FIG. 3. In FIG. 3(a), a Li Saiyu graph with a specific scanning frequency and phase difference is shown. Here, the light source generating module 112 is intermittently switched according to a specific frequency to generate a parallel light beam L1. In the present embodiment, the so-called "intermittently switched" means that the light source generating module 112 is turned on and off according to the specific preset frequency, so that after being reflected by the mirror module 114, the scanning light beam L2 is projected onto the screen. The curve on 200 is formed by a series of dense and continuous spots. On the other hand, in FIG. 3(b), the scanning beam L2 is scanned for the detection area according to the Li Sai scanning method. As can be seen from FIG. 3(b), by setting the scanning frequency of the mirror module 114 in the x direction and the y direction and the phase difference between the two, the scanning light source 110 can be greatly expanded in the area to be detected. Complete and exhaustive scanning. Therefore, the somatosensory detecting device 100 can provide an accurate scan result for the moving object in the detection area.

It is worth mentioning that, by using the above-mentioned microelectromechanical scanning galvanometer and the Li Saiyu scanning method, the scanning light source 110 of the embodiment is, for example, a laser light source, so that the step of focusing is not required before the detection, and the application thereof can be increased. Level and ease of use.

In the present embodiment, the scanning beam L2 scans the detection area according to the Li Sai scanning method, but the present invention is not limited thereto. In other embodiments, the scanning beam L2 can also scan the detection area according to a Raster scan or a Zigzag scan.

FIG. 4 illustrates a result of scanning the detection area by the scanning beam L2 according to the grid scanning method according to an embodiment of the invention. In FIG. 4, the scanning beam L2 performs raster scanning of the detection area by a top-down, left-to-right scanning method. Wherein, the thick black arrow represents that the scanning beam L2 is horizontally scanned from the left and the right, and the dashed arrow represents that the scanning beam L2 is returned to the left of the detection area after scanning the previous scanning line before performing the next scanning line. To start the horizontal scan of the one scan line to the right. It should be noted that the above-mentioned "upper", "lower", "left", and "right" directions are referred to with reference to FIG. 4 and are not intended to limit the raster scanning method of the present invention.

On the other hand, FIG. 5 illustrates a result of scanning the detection area by the scanning beam L2 according to the sawtooth scanning method according to an embodiment of the invention. Referring to FIG. 5, compared with the grid scan of FIG. 4, the zigzag scan of the present embodiment has a scan path substantially at a 45 degree angle to the horizontal direction, as shown in FIG. Among them, the thick black arrow represents the scanning path of the scanning beam L2 for zigzag scanning. Therefore, the scanning light source 110 of the embodiment can selectively scan the detection area by using a Li Sai scanning, a grid scanning or a sawtooth scanning. In addition, in the present embodiment, the scanning light source 110 can be designed to generate at least one scan pattern 210 in the detection area according to actual needs, such as a cross, an asterisk, or the like, which is sufficiently separated from other spots. Then, the processor 130 can process the image signals obtained by the image detectors 120a, 120b with reference to the position of the scan pattern 210 to obtain depth map information. For example, the scanning light source 110 may generate only one scan pattern 210 in the detection area, or first divide the detection area into a plurality of sub-areas, and then generate corresponding scan patterns in the sub-areas. Thereby, the processor 130 can calculate the position of each scan pattern to calculate the surrounding light spot to simplify the calculation process and increase the accuracy of the somatosensory detection. Moreover, due to the presence of the scanning pattern, the speed of the object to be detected detected by the body sensing device 100 can be increased.

It should be noted that although the embodiment uses a microelectromechanical scanning galvanometer as an exemplary embodiment of the mirror module, it is known to those skilled in the art that the microelectromechanical scanning galvanometer is not intended to limit the present invention. Mirror module. At the same time, the present invention is not limited to the Li Saiyu scanning method for scanning the detection area, and any scanning light source that can be detected is within the scope of the invention.

In other words, the scanning light source 110 of the present embodiment generates a plurality of scanning light beams L2 according to the Li Sai scanning method. When the scanning light source 110 performs the somatosensory detection on the object to be measured, a plurality of light spots can be sequentially generated on the object to be tested in the detection area by the scanning light beam L2. Then, the image detectors 120a and 120b respectively detect the light spots and respectively generate an image signal. Here, the light source band detectable by the image detectors 120a, 120b corresponds to the wavelength of the scanning light source 110. If the scanning light source 110 emits a light beam in the infrared light band, the image detectors 120a, 120b can detect at least the light source in the infrared light band. Similarly, if the scanning light source 110 emits a light beam in the visible light band, the image detectors 120a, 120b can detect at least the light source in the visible light band interval. Then, the processor 130 separately receives and processes the image signals to obtain a depth map information of the object to be tested.

Further, after receiving the spot information reflected by the object to be tested, the image detectors 120a and 120b of the embodiment respectively generate corresponding image signals. Each of the image signals corresponds to two image frames captured by the image detectors 120a and 120b at different viewing angles. Then, using the triangulation method, the processor 130 can calculate the distance of different regions of the image images relative to the image detectors 120a, 120b according to the image signals. Moreover, the processor 130 can define that the distances of the different regions relative to the image detectors 120a, 120b correspond to different gray levels to obtain depth map information.

For example, the detection area of the somatosensory detection device 100 is, for example, a distance within 1 to 5 meters of the front of the motion detection device 100, and the processor 130 can define different positions within the interval corresponding to gray scales of 0 to 255. Therefore, one of the depth map information obtained by the processor 130 is as shown in FIG. 6, for example. In FIG. 6, the darker color region is smaller in grayscale value, and is, for example, a detection region farther from the somatosensory detecting device 100 in the detecting region. In contrast, the lighter-colored area is larger in grayscale value, and is, for example, a detection area in the detection area that is closer to the somatosensory detecting device 100. Therefore, based on the principle of three-dimensional (3D) stereo imaging, after obtaining the depth map information, the processor 130 can reconstruct the moving state of the object to be tested in the detection area to achieve the purpose of somatosensory detection.

It is worth mentioning that the processor 130 of the embodiment may also use one of the image detectors 120a, 120b to identify a Region of Interest (ROI) of the object to be tested. Therefore, when the scanning light source detects the object to be tested, the scanning light beam L2 sequentially generates a light spot in the identified region of interest. In addition, the scanning light source 110 generates at least one scan pattern in the region of interest, and the processor 130 processes the image signal with reference to the scan pattern to obtain depth map information.

In summary, in an exemplary embodiment of the present invention, the somatosensory detecting device uses an active scanning projection to mark on an object, which simplifies the algorithm and increases system stability.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100. . . Somatosensory detection device

110. . . Scanning light source

112. . . Light source generating module

114. . . Mirror module

120a, 120b. . . Image detector

130. . . processor

200. . . Screen

210. . . Scanning pattern

L1. . . Parallel beam

L2. . . Scanning beam

FIG. 1 is a schematic structural diagram of a body sensing device according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing the architecture of a mirror module in different viewing angles according to an embodiment of the invention.

Fig. 3(a) shows a Li Saiyu graph of a specific scanning frequency and phase difference.

FIG. 3(b) shows the result of scanning the detection area by the scanning beam according to the Li Sai scanning method.

FIG. 4 illustrates a result of scanning a detection area of a scanning beam according to a grid scanning method according to an embodiment of the invention.

FIG. 5 illustrates a result of scanning a detection area of a scanning beam according to a sawtooth scanning method according to an embodiment of the invention.

FIG. 6 illustrates a depth map/depth image according to an embodiment of the invention.

100. . . Somatosensory detection device

110. . . Scanning light source

112. . . Light source generating module

114. . . Mirror module

120a, 120b. . . Image detector

130. . . processor

200. . . Screen

210. . . Scanning pattern

L1. . . Parallel beam

L2. . . Scanning beam

Claims (9)

A body sensing device is adapted to detect at least one object to be tested in an area, the body sensing device comprising: a scanning light source, generating a plurality of scanning beams according to a predetermined manner, wherein the body sensing When the detecting device detects the at least one object, the scanning light source generates a plurality of light spots sequentially by the scanning light beams in the region; and the second image detecting device detects the light spots respectively, and respectively generates one light spot And a processor that receives and processes the image signals to obtain a depth map information of the at least one object. The somatosensory detection device of claim 1, wherein the scanning light source comprises: a light source generating module that generates a parallel beam; and a mirror module that receives the parallel beam and according to the predetermined The parallel beam is reflected to produce the scanned beams. The somatosensory detecting device of claim 2, wherein the light source generating module is switched according to a specific frequency to generate the parallel light beam. The somatosensory detecting device of claim 2, wherein the mirror module reflects the parallel light beam according to a Lisai scan, a grid scan or a sawtooth scan to generate the scan beams. The somatosensory detecting device of claim 2, wherein the mirror module comprises a microelectromechanical scanning galvanometer. The somatosensory detection device of claim 1, wherein the scanning light source generates at least one scan pattern in the area, and the processor processes the image signals with reference to the at least one scan pattern to obtain the depth. Chart information. The somatosensory detection device of claim 1, wherein the processor uses one of the image detectors to identify a region of interest of the at least one object. The somatosensory detection device of claim 7, wherein when the scanning light source detects the at least one object, the scanning light beams sequentially generate the light spots in the region of interest. . The somatosensory detection device of claim 7, wherein the scanning light source generates at least one scan pattern in the region of interest, and the processor processes the image signals with reference to the at least one scan pattern to obtain The depth map information.