Lie detection device combining eye tracking and electroencephalogram features

Abstract

This invention discloses a lie detection device combining eye-tracking and electroencephalogram (EEG) signals, belonging to the field of lie detection devices. It includes a monitoring and mounting mechanism, with a lie detection mechanism disposed on the left side of the upper surface of the monitoring and mounting mechanism; the monitoring and mounting mechanism includes a table, with a display device disposed at the rear of the upper surface of the table and a control panel disposed at the front of the upper surface of the table; the lie detection mechanism includes a mounting plate, which is threadedly mounted to the left side of the upper surface of the table by bolts; a cylinder is mounted on the upper surface of the mounting plate via a pivot. This device integrates eye-tracking features captured by a binocular camera and EEG signals collected by electrode pads for joint analysis, solving the problems in existing technologies where eye-tracking features are easily affected by environmental interference and EEG signals are easily affected by irrelevant physiological activities when used alone. This reduces the limitations of single-signal detection and significantly improves the reliability of lie detection.

Description

Technical Field

[0001] This invention relates to the field of lie detection devices, and more particularly to lie detection devices that combine eye tracking and electroencephalogram (EEG) characteristics. Background Technology

[0002] Lie detection technology is an important means to help identify the truth. Traditional lie detection devices mostly rely on a single physiological signal, which has limitations such as low accuracy and poor adaptability to different scenarios. In existing technologies, eye-tracking technology or EEG detection technology alone has been applied to lie detection. Eye-tracking can capture eye behaviors such as pupil changes and fixation duration, while EEG can detect specific signals from the brain that reflect cognitive load. However, both are used independently and have not achieved synergy. When used alone, eye-tracking is easily affected by environmental interference, and EEG signals are easily affected by irrelevant physiological activities, resulting in insufficient recognition accuracy and failing to meet the reliability requirements of lie detection in fields such as law enforcement and security. Existing eye-tracking and EEG lie detection devices are mostly standalone designs, bulky, inconvenient to store, and unsuitable for desktop monitoring scenarios, making flexible unfolding and folding storage difficult. Furthermore, the fixed height and distance of the monitoring modules in these devices make them unsuitable for test subjects of different heights and sitting postures. Poor fit of the EEG monitoring components can lead to unstable signal acquisition, and eye-tracking monitoring struggles to accurately capture eye features, further impacting lie detection accuracy. We propose a lie detection device that combines eye-tracking and EEG features. Summary of the Invention

[0003] Purpose of the Invention: The purpose of this invention is to provide a lie detection device that combines eye-tracking and EEG features. This device integrates eye-tracking and EEG detection technologies, combining them for joint analysis. This reduces the impact of environmental interference and irrelevant physiological activities on individual signals, improving the accuracy of lie detection and meeting the reliability requirements of fields such as law enforcement and security. Another purpose of this invention is to provide a compact, foldable, and desktop-compatible lie detection device. The height and distance of the monitoring module are adjustable to accommodate test subjects of different heights and sitting postures, improving the fit of the EEG monitoring components and the accuracy of eye-tracking monitoring, ensuring signal acquisition stability, and further optimizing the lie detection effect.

[0004] Technical solution: A lie detection device combining eye tracking and EEG characteristics, including a monitoring and installation mechanism, wherein a lie detection mechanism is provided on the left side of the upper surface of the monitoring and installation mechanism; The monitoring installation mechanism includes a table, a display device is provided behind the upper surface of the table, and a control panel is provided in front of the upper surface of the table. The lie detector includes a mounting plate, which is installed to the upper surface of the tabletop via bolts and left-side threads. A cylinder is mounted on the upper surface of the mounting plate via a rotating shaft. A sleeve is slidably mounted on the outer side of the cylinder. A cross arm is fixedly mounted on the top of the sleeve. A head cover is fixedly connected to the bottom of the cross arm. An electrode plate is provided on the right side of the head cover. A binocular camera is located at the lower right of the electrode plate.

[0005] Furthermore, the bottom of the tabletop is fixedly connected to multiple support legs, and the bottom ends of the support legs are fixedly connected to casters.

[0006] Furthermore, a column is fixedly connected to the front of the upper surface of the mounting plate, and a rotating head is rotatably mounted on the top of the column via a rotating shaft. An electric push rod is fixedly mounted on the rear end of the rotating head, and a rotating head is fixedly connected to the rear end of the output end of the electric push rod. A traction plate is rotatably mounted on the lower surface of the rotating head and located on the outer side of the cylinder via a rotating shaft, and the inner side of the traction plate is fixedly connected to the outer wall of the cylinder.

[0007] Furthermore, a spring is fixedly connected between the cylinder and the sleeve.

[0008] Furthermore, a horizontal groove is formed on the upper surface of the cross arm, a horizontal bar is fixedly connected inside the horizontal groove, and a vertical plate is slidably installed on the outer wall of the horizontal bar.

[0009] Furthermore, a through-type vertical groove is provided on the lower left side of the vertical plate, a screw is threaded on the inner side of the vertical groove, a lifting block is threaded on the outer side of the screw, the left side of the lifting block is fixedly connected to the right side of the binocular camera, and a knob is fixedly connected to the bottom end of the screw.

[0010] Furthermore, an adjustment frame is fixedly connected to the right side of the headgear, a guide rod is fixedly connected inside the adjustment frame, a movable plate is slidably connected to the outer wall of the guide rod, the left side of the movable plate is fixedly connected to the right side of the electrode plate, and a spring is fixedly connected to the movable plate and the opposite side of the adjustment frame, located outside the guide rod.

[0011] Beneficial effects: This device integrates eye movement features captured by binocular cameras with EEG signals collected by electrode pads for joint analysis, which solves the problems in the prior art where eye movement features are easily affected by environmental interference and EEG signals are easily affected by irrelevant physiological activities when the two are used alone. It reduces the limitations of single signal detection and significantly improves the reliability of lie detection. The device uses an electric push rod, traction plate, cylinder and sleeve to rotate the horizontal arm, head cover and binocular camera as a whole, so that it can be stored parallel to the edge of the table or unfolded vertically for use. The binocular camera can adjust the horizontal distance by sliding the vertical plate along the horizontal bar, and adjust the height of the lifting block by rotating the screw with a knob, achieving flexible adjustment of the horizontal distance and vertical height. This ensures accurate capture of eye movement characteristics such as pupil changes and fixation duration for different test subjects. The electrode pads slide along the guide rod via a movable plate, and with the elastic action of spring two, they can automatically fit the corresponding position on the test subject's head, ensuring close contact between the electrode pads and the skin, improving the stability of EEG signal acquisition, avoiding inaccurate monitoring due to individual differences among test subjects, and further optimizing the lie detection effect. Attached Figure Description

[0012] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a side view of the structure of the present invention; Figure 3 This is a schematic diagram of the monitoring installation mechanism of the present invention; Figure 4 This is a schematic diagram of the lie detection mechanism of the present invention; Figure 5 This is a cross-sectional structural diagram of the lie detection mechanism of the present invention.

[0013] In the diagram: 1. Monitoring installation mechanism; 2. Lie detection mechanism; 101. Table; 102. Display device; 103. Control panel; 104. Support leg; 105. Caster wheel; 201. Mounting plate; 202. Cylinder; 203. Sleeve; 204. Cross arm; 205. Head cover; 206. Electrode plate; 207. Binocular camera; 208. Column; 209. Rotating head one; 210. Electric push rod; 211. Rotating head two; 212. Traction plate; 213. Spring one; 214. Horizontal groove; 215. Horizontal bar; 216. Vertical plate; 217. Spring two; 218. Vertical groove; 219. Screw; 220. Lifting block; 221. Knob; 222. Adjustment frame; 223. Guide rod; 224. Movable plate. Detailed Implementation

[0014] To make the technical solution of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Example like Figure 1 , Figure 2 and Figure 3 As shown, a lie detection device combining eye tracking and EEG features is provided, including a monitoring installation mechanism 1; The monitoring installation mechanism 1 includes a table 101, a display device 102 is provided behind the upper surface of the table 101, and a control panel 103 is provided in front of the upper surface of the table 101. The bottom of the tabletop 101 is fixedly connected to multiple support legs 104, and the bottom end of the support legs 104 is fixedly connected to casters 105; Before use, the entire device can be moved to a suitable desktop monitoring scenario by pushing the universal wheels 105 at the bottom of the support leg 104. After moving it into place, ensure that the support leg 104 lands smoothly to ensure the overall stability of the device. During the test, the staff can set lie detection parameters and start / stop monitoring through the control panel 103 on the front of the upper surface of the table 101. The tester can view the test prompt information through the display device 102 on the back of the upper surface of the table 101 to facilitate the completion of the lie detection process.

[0016] like Figure 4 and Figure 5 As shown, a lie detector 2 is installed on the left side of the upper surface of the monitoring installation mechanism 1; The lie detector 2 includes a mounting plate 201, which is installed on the upper surface of the table 101 by bolts and left thread. A cylinder 202 is mounted on the upper surface of the mounting plate 201 via a rotating shaft. A sleeve 203 is slidably mounted on the outer side of the cylinder 202. A cross arm 204 is fixedly mounted on the top of the sleeve 203. A head cover 205 is fixedly connected to the bottom of the cross arm 204. An electrode plate 206 is provided on the right side of the head cover 205. An adjustment frame 222 is fixedly connected to the right side of the headgear 205. A guide rod 223 is fixedly connected inside the adjustment frame 222. A movable plate 224 is slidably connected to the outer wall of the guide rod 223. The left side of the movable plate 224 is fixedly connected to the right side of the electrode plate 206. A spring 217 is fixedly connected to the opposite side of the movable plate 224 and the adjustment frame 222, and located outside the guide rod 223. When the test subject wears the headgear 205, the electrode pads 206 will slide along the guide rod 223 via the movable plate 224 under the elastic force of the spring 217, automatically fitting the corresponding position on the test subject's head, ensuring that the electrode pads 206 are in close contact with the skin, and ensuring the stability of EEG signal acquisition. A binocular camera 207 is located on the lower right side of the electrode plate 206; A horizontal groove 214 is provided on the upper surface of the horizontal arm 204. A horizontal bar 215 is fixedly connected inside the horizontal groove 214. A vertical plate 216 is slidably installed on the outer wall of the horizontal bar 215.

[0017] A through-type vertical groove 218 is provided on the lower left side of the vertical plate 216. A screw 219 is threaded on the inner side of the vertical groove 218. A lifting block 220 is threaded on the outer side of the screw 219. The left side of the lifting block 220 is fixedly connected to the right side of the binocular camera 207. A knob 221 is fixedly connected to the bottom end of the screw 219. Based on the test subject's eye height and sitting posture, rotating knob 221 drives screw 219 to rotate within vertical groove 218, causing lifting block 220 to move up and down along screw 219, thereby adjusting the height of binocular camera 207 so that it is aligned with the test subject's eyes; at the same time, vertical plate 216 can be pushed to slide left and right along horizontal bar 215 within horizontal groove 214 to adjust the horizontal distance between binocular camera 207 and the test subject's eyes, ensuring that binocular camera 207 can accurately capture the test subject's pupil changes, fixation duration, and other eye movement characteristics; A column 208 is fixedly connected to the front of the upper surface of the mounting plate 201. A rotating head 209 is rotatably mounted on the top of the column 208 via a rotating shaft. An electric push rod 210 is fixedly mounted on the rear end of the rotating head 209. A rotating head 211 is fixedly connected to the rear end of the output end of the electric push rod 210. A traction plate 212 is rotatably mounted on the lower surface of the rotating head 211 and on the outer side of the cylinder 202 via a rotating shaft. The inner side of the traction plate 212 is fixedly connected to the outer wall of the cylinder 202. A spring 213 is fixedly connected between the cylinder 202 and the sleeve 203. Before testing, the electric push rod 210 is extended and retracted by the control panel 103. The electric push rod 210 drives the traction plate 212 to move by rotating head 1 209 and rotating head 211. The traction plate 212 pulls the cylinder 202 to rotate around the pivot on the mounting plate 201, thereby adjusting the overall angle of the horizontal arm 204, the head cover 205, and the binocular camera 207, so that they can be stored parallel to the edge of the table or unfolded vertically for use. The sleeve 203 can slide up and down along the cylinder 202. With the elastic action of the spring 213, the height of the cross arm 204 can be further adjusted so that the head cover 205 fits the tester's head. After the test, the electric push rod 210 is retracted, which drives the cylinder 202 to rotate. This allows the horizontal arm 204 to be folded until it is parallel to the edge of the table 101, achieving compact storage of the device and saving storage space.

[0018] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A lie detection device combining eye-tracking and EEG characteristics, comprising a monitoring and installation mechanism (1), characterized in that: A lie detector (2) is provided on the left side of the upper surface of the monitoring installation mechanism (1). The monitoring installation mechanism (1) includes a table (101), a display device (102) is provided behind the upper surface of the table (101), and a control panel (103) is provided in front of the upper surface of the table (101). The lie detector (2) includes a mounting plate (201), which is threaded to the upper surface of the table (101) by bolts; A cylinder (202) is mounted on the upper surface of the mounting plate (201) via a rotating shaft. A sleeve (203) is slidably mounted on the outer side of the cylinder (202). A cross arm (204) is fixedly mounted on the top of the sleeve (203). A head cover (205) is fixedly connected to the bottom of the cross arm (204). An electrode plate (206) is provided on the right side of the head cover (205). A binocular camera (207) is provided on the lower right side of the electrode plate (206).

2. The lie detection device combining eye tracking and EEG characteristics according to claim 1, characterized in that: The bottom of the tabletop (101) is fixedly connected to a plurality of support legs (104), and the bottom end of the support legs (104) is fixedly connected to casters (105).

3. The lie detection device combining eye tracking and EEG characteristics according to claim 1, characterized in that: A column (208) is fixedly connected to the front of the upper surface of the mounting plate (201). A rotating head (209) is rotatably mounted on the top of the column (208) via a rotating shaft. An electric push rod (210) is fixedly mounted on the rear end of the rotating head (209). A rotating head (211) is fixedly connected to the rear end of the output end of the electric push rod (210). A traction plate (212) is rotatably mounted on the lower surface of the rotating head (211) and on the outer side of the cylinder (202) via a rotating shaft. The inner side of the traction plate (212) is fixedly connected to the outer wall of the cylinder (202).

4. The lie detection device combining eye tracking and EEG characteristics according to claim 1, characterized in that: A spring (213) is fixedly connected between the cylinder (202) and the sleeve (203).

5. The lie detection device combining eye tracking and EEG characteristics according to claim 1, characterized in that: A horizontal groove (214) is provided on the upper surface of the horizontal arm (204), and a horizontal bar (215) is fixedly connected inside the horizontal groove (214). A vertical plate (216) is slidably installed on the outer side wall of the horizontal bar (215).

6. The lie detection device combining eye tracking and EEG characteristics according to claim 5, characterized in that: A through-type vertical groove (218) is provided on the lower left side of the vertical plate (216). A screw (219) is threaded on the inner side of the vertical groove (218). A lifting block (220) is threaded on the outer side of the screw (219). The left side of the lifting block (220) is fixedly connected to the right side of the binocular camera (207). A knob (221) is fixedly connected to the bottom end of the screw (219).

7. The lie detection device combining eye tracking and EEG characteristics according to claim 1, characterized in that: An adjustment frame (222) is fixedly connected to the right side of the headgear (205). A guide rod (223) is fixedly connected inside the adjustment frame (222). A movable plate (224) is slidably connected to the outer wall of the guide rod (223). The left side of the movable plate (224) is fixedly connected to the right side of the electrode plate (206). A spring (217) is fixedly connected to the movable plate (224) on the opposite side of the adjustment frame (222) and on the outside of the guide rod (223).

Images