CN110824577A - Infrared target detection platform and detection method thereof - Google Patents
Infrared target detection platform and detection method thereof Download PDFInfo
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- CN110824577A CN110824577A CN201911325944.5A CN201911325944A CN110824577A CN 110824577 A CN110824577 A CN 110824577A CN 201911325944 A CN201911325944 A CN 201911325944A CN 110824577 A CN110824577 A CN 110824577A
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Abstract
The invention relates to the technical field of infrared detection, and discloses an infrared target detection platform and a detection method thereof, which are used for improving the definition of a detected infrared image, improving the detection distance and reducing the detection cost; the infrared target detection platform comprises an infrared detector, a target detection module and a target detection module, wherein the infrared detector is used for detecting infrared image information of a target; the reflecting device is used for carrying out intermittent motion under the driving of the driving mechanism so as to expand the horizontal imaging visual angle of the infrared detector; the driving mechanism is used for driving the reflecting device to perform intermittent motion between a preset first position and a preset second position according to the motion curve information, wherein a plurality of gaze positions are arranged between the first position and the second position; the controller is used for generating motion curve information and sending the motion curve information to the driving mechanism; the information processor is used for receiving the infrared image information and generating a panoramic image according to the infrared image information; and the system is also used for detecting and analyzing the target according to the panoramic images at the adjacent moments so as to obtain the motion trail of the target.
Description
Technical Field
The invention relates to the technical field of infrared detection, in particular to an infrared target detection platform and a detection method thereof.
Background
The infrared detector can realize effective detection of day and night targets, technical means such as splicing of multiple detectors, detector motion despinning, detector stepping staring and the like are generally adopted for realizing large-visual-angle and long-distance target detection, and due to the fact that the technical means have great technical difficulty, the infrared detector is high in price, and the mechanical structure and control algorithm of the despinning and stepping staring technology are complex, the product technology adopting the technical means is high in price, so that products are difficult to popularize and apply in the civil market, the definition of infrared images obtained by the method is insufficient, and the detection distance is limited.
Disclosure of Invention
The invention aims to provide an infrared target detection platform and a detection method thereof, which are used for improving the definition of a detected infrared image, improving the detection distance and reducing the detection cost.
In order to achieve the above object, the present invention provides an infrared target detection platform, comprising:
the infrared detector is used for detecting infrared image information of the target;
the reflecting device is driven by the driving mechanism to perform intermittent motion so as to expand the horizontal imaging visual angle of the infrared detector;
the driving mechanism is used for driving the reflecting device to perform intermittent motion between a preset first position and a preset second position according to the motion curve information, wherein a plurality of gaze positions are arranged between the first position and the second position;
the controller is used for generating the motion curve information and sending the motion curve information to the driving mechanism;
the information processor is used for receiving the infrared image information and generating a panoramic image according to the infrared image information; the panoramic image acquisition system is also used for detecting and analyzing the target according to the panoramic images at the adjacent moments so as to acquire the motion trail of the target;
the infrared detector and the mirror surface of the reflection device are arranged at an angle, the reflection device and the driving mechanism are coaxially installed, the controller is in communication connection with the driving mechanism, and the information processor is connected with the infrared detector.
Preferably, the method further comprises the following steps: and the damping device is coaxially arranged with the driving mechanism and is used for increasing the rotating friction force of the driving mechanism.
Preferably, the damping device comprises a damping shaft, a ferrule and a gasket which are arranged on the damping shaft, and the damping shaft is connected with the shaft of the driving mechanism.
Preferably, the focusing device further comprises a focusing structure with an opening at the outer side, and the focusing structure is sleeved on the infrared detector and used for adjusting the focal length of the infrared detector.
Preferably, the reflecting device comprises a reflecting mirror, a bracket connected with the reflecting mirror and a coupler connected with the bracket through a bearing, wherein the coupler is connected with a shaft of the driving mechanism.
As a general inventive concept, the present invention also provides a detection method applied to the above infrared target detection platform, including:
the controller generates motion curve information and sends the motion curve information to the driving mechanism;
the driving mechanism drives the reflecting device to intermittently move at a preset first position and a preset second position according to the motion curve information; wherein a plurality of gaze locations are provided between the first location and the second location;
the reflecting device is driven by the driving mechanism to perform intermittent motion so as to expand the horizontal imaging visual angle of the infrared detector;
the infrared detector detects infrared image information of a target, the infrared image information is fed back to the information processor, the information processor generates a panoramic image according to the infrared image information, and the target is detected and analyzed according to the panoramic images at adjacent moments so as to obtain the motion trail of the target.
Preferably, the infrared target detection platform further comprises a damping device, the driving mechanism drives the reflection device to form a gaze field at each gaze position in the process of intermittent movement at the preset first position and the preset second position, and the damping device increases the rotation friction force of the driving mechanism stopping at each gaze field position.
Preferably, the information processor generating the panorama from the infrared image information includes:
preprocessing infrared image information by adopting a linear stretching method to obtain an initial image of each staring view field;
splicing each initial image to obtain a panoramic image;
and acquiring two panoramic pictures at adjacent moments, and performing difference calculation according to the image frames of the two panoramic pictures to acquire the motion trail of the target.
The invention has the following beneficial effects:
according to the infrared target detection platform and the detection method thereof, the infrared target detection platform drives the reflection device to move intermittently from the preset first position to the preset second position through the driving mechanism, wherein a plurality of gaze positions are arranged between the first position and the second position, the horizontal imaging visual angle of the infrared detector can be expanded, the infrared target detection with a large visual field and a long distance is realized through the cooperation of the infrared detector and the reflection device, and the detection cost is reduced.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a hardware block diagram of an infrared target detection platform in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic structural view of a damping device according to a preferred embodiment of the present invention;
FIG. 3 is a flow chart of a probing method in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic diagram of the control pulse division ratio of the preferred embodiment of the present invention;
FIG. 5 is a schematic diagram of the motion control timing sequence of the preferred embodiment of the present invention;
fig. 6 is a view of the gaze field of a preferred embodiment of the present invention.
Description of the drawings:
1. a damping shaft; 2. a ferrule; 3. and (7) a gasket.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
According to the infrared target detection platform and the detection method thereof, the maximum horizontal field angle exceeds 90 degrees, the detection distance to people can exceed 500 meters, the detection distance to vehicles can reach 1000 meters, and the imaging frame frequency can reach 2 Hz. The technology greatly reduces the production price of products, and can be widely applied to protection of sensitive areas such as military camps, prisons, power stations, dams, water treatment stations, solar power plants, wind power plants, oil fields, oil depots, ammunition depots, data centers and the like.
It should be noted that configuration parameters of a detector adopted by the platform, target detection parameters, target identification parameters, an area of interest, and the like need to be set according to weather conditions and target characteristics.
Example 1
As shown in fig. 1, the present implementation provides an infrared target detection platform, including:
the infrared detector is used for detecting infrared image information of the target;
the reflecting device is used for carrying out intermittent motion under the driving of the driving mechanism so as to expand the horizontal imaging visual angle of the infrared detector;
the driving mechanism is used for driving the reflecting device to perform intermittent motion between a preset first position and a preset second position according to the motion curve information, wherein a plurality of gaze positions are arranged between the first position and the second position;
the controller is used for generating motion curve information and sending the motion curve information to the driving mechanism;
the information processor is used for receiving the infrared image information and generating a panoramic image according to the infrared image information; the panoramic image acquisition system is also used for detecting and analyzing the target according to the panoramic images at the adjacent moments so as to acquire the motion trail of the target;
the infrared detector and the mirror surface of the reflection device are arranged in an angle mode, the reflection device and the driving mechanism are coaxially installed, the controller is in communication connection with the driving mechanism, and the information processor is connected with the infrared detector.
The infrared target detection platform drives the reflection device to intermittently move from a preset first position to a preset second position through the driving mechanism, wherein a plurality of gaze positions are arranged between the first position and the second position, the horizontal imaging visual angle of the infrared detector can be expanded, the infrared target detection with large visual field and long distance is realized through the cooperation of the infrared detector and the reflection device, and the detection cost is reduced.
The infrared target detection platform of this embodiment still includes: and the damping device is coaxially arranged with the driving mechanism and is used for increasing the rotating friction force of the driving mechanism. In this embodiment, the driving mechanism is a stepping motor, but the invention is not limited thereto, and the driving mechanism may be other devices capable of achieving the same function under different use conditions.
As a preferred embodiment of the present embodiment, the damping device includes a damping shaft 1, a ferrule 2 and a spacer 3 provided on the damping shaft, and the damping shaft is connected to a shaft of the driving mechanism. Preferably, the ferrule is an O-ring and the gasket is a PTPE gasket. In practical situations, when the reflecting device moves to a first position with a certain angle, a second position or any position between the first position and the second position, the reflecting device cannot be stopped immediately, and oscillation exists. Therefore, this embodiment shortens the oscillation process by increasing the damping. Specifically, as shown in fig. 2, the rotation friction force of the damping shaft is increased by installing the O-ring and the PTPE gasket, the damping shaft is connected with the shaft of the driving mechanism, the rotation friction force of the driving mechanism is further increased, and under the condition of increasing the friction force, kinetic energy can be quickly consumed when the motor stops rotating, so that the damping effect is achieved, the oscillation is reduced, and stable imaging in the infrared detection process is ensured.
As a preferred embodiment of this embodiment, 11 gaze locations are provided between the first location and the second location, i.e. in this embodiment there are 13 gaze locations in total (one gaze location in each of the first location and the second location).
The infrared target detection platform of this embodiment still includes, outside open-ended focusing structure, and the focusing structure cover is established and is used for adjusting infrared detector's focus on infrared detector. The window is arranged on the outer side of the focusing structure, so that the focusing function can be realized very conveniently.
In a preferred embodiment of this embodiment, the reflecting device includes a reflecting mirror, a bracket connected to the reflecting mirror, and a coupling connected to the bracket through a bearing, and the coupling is connected to a shaft of the driving mechanism. Preferably, the reflecting device is detachably mounted, so that the device is flexible to use and convenient to use and store.
Example 2
As shown in fig. 3, a detection method applied to the infrared target detection platform includes:
the controller generates motion curve information and sends the motion curve information to the driving mechanism;
the driving mechanism drives the reflecting device to intermittently move at a preset first position and a preset second position according to the motion curve information; wherein, a plurality of gaze positions are arranged between the first position and the second position;
the reflecting device is driven by the driving mechanism to perform intermittent motion so as to expand the horizontal imaging visual angle of the infrared detector;
the infrared detector detects infrared image information of the target, the infrared image information is fed back to the information processor, the information processor generates a panoramic image according to the infrared image information, and the target is detected and analyzed according to the panoramic images at adjacent moments so as to obtain the motion trail of the target.
The detection method expands the horizontal imaging visual angle of the infrared detector, realizes the long-distance infrared target detection with large visual field through the cooperation of the infrared detector and the reflecting device, and reduces the detection cost.
In this embodiment, parameters of a frequency division ratio of a motion control pulse of a stepping motor are generated through calculation and experiments, a high level and a low level of each pulse correspond to a preset frequency division ratio, frequency division ratio data is instantiated into ROM data and stored in a controller (FPGA), and in the operation process, frequency division ratio information is read through different state controls to generate the motion control pulse, so that the stepping motor is driven to move, and a reflector is rapidly switched between different viewing fields. The control pulse division ratio parameter is shown in fig. 4. In order to realize the motion control of the reflecting mirror, the system state conversion is controlled by a motion control state machine in the FPGA to generate a designed time sequence, and the motion control time sequence is shown in the following figure 5.
In this embodiment, when image acquisition is performed, the controller generates a camera trigger signal at regular time, image data is transmitted to the TX2 processing board through the Gige interface, and the processing board performs caching and provides the image data to the subsequent target detection and display preprocessing unit. According to the working mode of the camera, the pictures are divided into a custom mode and an optimal mode.
As a preferred embodiment of the present embodiment, during the process that the driving mechanism drives the reflection device to move intermittently between the preset first position and the preset second position, a gaze field is formed at each gaze position, and the damping device increases the rotation friction force of the driving mechanism stopping at each gaze field position.
Specifically, as shown in fig. 6, in the present embodiment, 13 gaze fields are formed. It should be noted that, the present invention is not limited to this, and different motion curves of the reflecting mirror may be set according to a specific use scenario to form different numbers of gaze fields. However, it is within the scope of the present invention to set any number of gaze locations.
In the imaging process of the embodiment, a stepping motor is adopted to drive the reflector to intermittently move between the position a (a first position) and the position b (a second position) to form 13 staring view fields, then the reflector is quickly swung back, and the horizontal imaging view angle of the infrared detector is expanded through the intermittent back-and-forth movement of the reflector.
The infrared detector processes the infrared image information obtained in the 13 staring view fields by adopting a linear stretching method, and converts the acquired 16-bit digital image into an 8-bit digital image to realize normal display, wherein the stretching algorithm in the embodiment is as follows:
where P is the stretched image pixel value, P is the original image pixel value, μ is the original image mean, σ is the mean square error of the original image, and α is the stretching coefficient.
Then, the local contrast of the image is enhanced by adopting a self-adaptive histogram equalization algorithm (CLAHE) without influencing the overall contrast, the brightness can be better distributed on the histogram, then the final panoramic image is obtained by processing image rotation, excessive splicing seam linearity, white edge correction and the like, and the problems of excessive and uneven splicing seams, uneven background brightness and the like of the panoramic image can be effectively solved.
Meanwhile, in the working process of the platform, the reflector needs to move rapidly and intermittently and is rapidly static when reaching the gaze position, the vibration problem of the reflector is effectively solved through the damping device, the definition of the acquired infrared image is improved, and the detection distance of the infrared target is increased.
It should be noted that, when performing infrared detection on a target, a small target at a far position is equivalent to a noise characteristic, and if the target is small, it is easily confused with a background or a far noise, therefore, in this embodiment, by acquiring two panoramas of adjacent frames, performing difference calculation on positions of the same gaze field in the two panoramas to perform track association, a motion track of the target to be detected can be accurately determined, an influence caused by the noise is small, a detection probability is improved, the noise and an associated target that meets a human or vehicle motion characteristic can be effectively distinguished, and a target detection performance of the entire platform is effectively improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An infrared target detection platform, comprising:
the infrared detector is used for detecting infrared image information of the target;
the reflecting device is driven by the driving mechanism to perform intermittent motion so as to expand the horizontal imaging visual angle of the infrared detector;
the driving mechanism is used for driving the reflecting device to perform intermittent motion between a preset first position and a preset second position according to the motion curve information, wherein a plurality of gaze positions are arranged between the first position and the second position;
the controller is used for generating the motion curve information and sending the motion curve information to the driving mechanism;
the information processor is used for receiving the infrared image information and generating a panoramic image according to the infrared image information; the panoramic image acquisition system is also used for detecting and analyzing the target according to the panoramic images at the adjacent moments so as to acquire the motion trail of the target;
the infrared detector and the mirror surface of the reflection device are arranged at an angle, the reflection device and the driving mechanism are coaxially installed, the controller is in communication connection with the driving mechanism, and the information processor is connected with the infrared detector.
2. The infrared target detection platform of claim 1, further comprising: and the damping device is coaxially arranged with the driving mechanism and is used for increasing the rotating friction force of the driving mechanism.
3. The infrared target detection platform of claim 2, wherein the damping device comprises a damping shaft, a collar and a spacer disposed on the damping shaft, and the damping shaft is coupled to the shaft of the drive mechanism.
4. The infrared target detection platform as claimed in claim 1, further comprising a focusing structure with an opening at an outer side, wherein the focusing structure is sleeved on the infrared detector for adjusting the focal length of the infrared detector.
5. The infrared target detection platform of claim 1, characterized in that the reflection means comprises a mirror, a bracket connected to the mirror, and a coupling connected to the bracket through a bearing, the coupling being connected to a shaft of the driving mechanism.
6. A detection method applied to the infrared target detection platform of any one of the claims 1 to 5, characterized by comprising the following steps:
the controller generates motion curve information and sends the motion curve information to the driving mechanism;
the driving mechanism drives the reflecting device to intermittently move at a preset first position and a preset second position according to the motion curve information; wherein a plurality of gaze locations are provided between the first location and the second location;
the reflecting device is driven by the driving mechanism to perform intermittent motion so as to expand the horizontal imaging visual angle of the infrared detector;
the infrared detector detects infrared image information of a target, the infrared image information is fed back to the information processor, the information processor generates a panoramic image according to the infrared image information, and the target is detected and analyzed according to the panoramic images at adjacent moments so as to obtain the motion trail of the target.
7. The method of claim 6, wherein said infrared target detection platform further comprises a damping device, said driving mechanism moving said reflective device intermittently between a first predetermined position and a second predetermined position to create a gaze field at each of said gaze positions, said damping device increasing rotational friction of said driving mechanism at each gaze field position.
8. The detection method of claim 7, wherein the information processor generating the panorama from the infrared image information comprises:
preprocessing infrared image information by adopting a linear stretching method to obtain an initial image of each staring view field;
splicing each initial image to obtain a panoramic image;
and acquiring two panoramic pictures at adjacent moments, and performing difference calculation according to the image frames of the two panoramic pictures to acquire the motion trail of the target.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114070984A (en) * | 2021-11-16 | 2022-02-18 | 英飞睿(成都)微系统技术有限公司 | Stepping type panoramic imaging device, method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114070984A (en) * | 2021-11-16 | 2022-02-18 | 英飞睿(成都)微系统技术有限公司 | Stepping type panoramic imaging device, method and system |
| CN114070984B (en) * | 2021-11-16 | 2024-05-31 | 英飞睿(成都)微系统技术有限公司 | Stepping panoramic imaging equipment, method and system |
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