Machine vision micro-displacement monitoring active target

Abstract

The utility model belongs to the technical field of machine vision displacement detection, and particularly relates to a machine vision micro-displacement monitoring active target, which comprises a sliding guide rail support and a three-way adjustable support, and adopts the matching of a solar panel and a photoresistor to actively adjust the on / off and the brightness of a target light source, so as to realize the purpose of monitoring the micro-displacement. The reflection target body can be normally used at night or in a non-illumination environment; a target surface detection area adopts a circular light equalizing plate design and an annular infrared LED layout, and a non-luminous area of the target surface is made of a black suede matting material, so that the definition and contrast of the luminous area of the target surface on the edge of machine vision imaging are improved, and the measurement precision is improved; as an optimized measurement target object of a machine vision long-distance displacement detection system, links such as target identification, edge detection, centering calculation and proportionality coefficient calibration in an auxiliary machine vision displacement measurement process are realized, the measurement precision and accuracy are greatly improved, and all-weather operation is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to machine vision displacement detection field technical field especially relates to a kind of machine vision micro-displacement monitoring active target. BACKGROUND

[0002] With the development of image acquisition equipment and image processing technology, the current vision measurement technology has been widely used in medical, military, agricultural production and other fields. In the aspect of precision parts appearance and size detection, its precision has reached micron level. Since the vision measurement technology needs more target pixel information, it usually relies on high-performance image acquisition equipment, and the precision is not ideal in long-distance measurement. Centering algorithm is an algorithm usually applied to astronomical image data processing, which calculates the accurate position of the image according to the distribution characteristics and statistical characteristics of the pixel information of the star image in the graph, which can reach sub-pixel level. In the field of computer vision, this algorithm can also be used to improve the detection accuracy.

[0003] In the prior art, the existing active target usually needs to use laser ranging, handheld RTK to measure the straight-line distance from the target installation position to the machine vision camera installation position, and then calculate the proportionality coefficient. At the same time, the definition and contrast of the upper edge of the machine vision imaging are not high, there are imaging glare, ghost and other factors that are not conducive to visual detection, which reduces the measurement accuracy and precision of the machine vision displacement detection system, lacks strong light shielding and rainfall shielding design, causes strong light to irradiate the target surface or rainwater to wet the target surface, affects machine vision imaging, does not have the function of ruler, and cannot be used for target in-situ proportionality coefficient calibration in machine vision measurement mode. Therefore, the present application proposes a kind of machine vision micro-displacement monitoring active target for solving the above problems. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the shortcomings in the prior art that the active target usually needs to use laser ranging, handheld RTK to measure the straight-line distance from the target installation position to the machine vision camera installation position, and then calculate the proportionality coefficient. At the same time, the definition and contrast of the upper edge of the machine vision imaging are not high, there are imaging glare, ghost and other factors that are not conducive to visual detection, which reduces the measurement accuracy and precision of the machine vision displacement detection system, lacks strong light shielding and rainfall shielding design, causes strong light to irradiate the target surface or rainwater to wet the target surface, affects machine vision imaging, does not have the function of ruler, and cannot be used for target in-situ proportionality coefficient calibration in machine vision measurement mode. Therefore, the present application proposes a kind of machine vision micro-displacement monitoring active target for solving the above problems.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A kind of machine vision micro-displacement monitoring active target, including sliding guide rail support and three-way adjustable support, the active target further includes:

[0007] The calibration target body is arranged in two, and the two calibration target bodies are mounted on the top of the sliding guide rail support and are in sliding connection with the sliding guide rail support;

[0008] The monitoring target body is fixedly mounted on the top of the three-way adjustable support, and the front side of the monitoring target body and the calibration target body is provided with a target surface light emitting area and a target surface non-light emitting area, and the target surface non-light emitting area is sleeved on the corresponding target surface light emitting area.

[0009] As a preferred scheme of the utility model, the top of the monitoring target body is fixedly mounted with a solar panel.

[0010] As a preferred scheme of the utility model, the front end of the solar panel is fixedly mounted with a photoresistor.

[0011] As a preferred scheme of the utility model, the bottom of the monitoring target body is provided with a switch and a DC charging port.

[0012] Beneficial effects:

[0013] 1. The active infrared light target with a solar energy storage system and with light intensity brightness adjustment solves the problem of needing to externally hang a high-power illuminating lamp for the passive reflection target in a dark or lightless environment.

[0014] 2. The target surface adopts a circular light uniforming plate design, the back of the light uniforming plate adopts a ring-shaped infrared LED layout, the target surface non-light emitting area is made of black velvet light absorbing material, the edge definition and contrast of the target surface light emitting area (visual detection area) on the machine vision imaging are improved, the imaging glare, ghosting and other factors that are not conducive to visual detection are reduced, the machine vision system edge detection and centering calculation are helped, and the measurement precision is improved.

[0015] 3. The calibration target is provided with a sliding guide rail with scale reading, the actual distance / sub-pixel distance of the in-situ calibration target mounting point of the machine vision displacement detection system is assisted in being calibrated, so that the proportional coefficient of the position is calculated.

[0016] 4. The three-way adjustable support is adjusted in three directions, so that the target surface can be directed to the machine vision camera during on-site installation.

[0017] 5. The waterproof and light blocking structure design, the solar panel is floated forward, rain is blocked and light is blocked, and the influence of external light source and rainfall on target surface detection and identification is reduced.

[0018] The utility model discloses as a kind of optimized machine vision long-distance displacement detection system's measuring target object, to assist target identification, edge detection, centring calculation and proportion coefficient calibration etc. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is the structure front view of the sliding guide rail support and calibration target body of the utility model;

[0020] Fig. 2 It is the structure front view of the three-way adjustable support and monitoring target body of the utility model.

[0021] In the figure: 1, sliding guide rail support;2, three-way adjustable support;3, monitoring target body;31, target surface non-light-emitting area;32, target surface light-emitting area;33, solar panel;34, switch;35, DC charging port;4, calibration target body. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model below, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0023] EMBODIMENT

[0024] REFERENCE Figs. 1-2 A kind of machine vision micro-displacement monitoring active target, including sliding guide rail support 1 and three-way adjustable support 2, the active target further includes:

[0025] Calibration target body 4 is provided as two, two calibration target bodies 4 are installed in the top of sliding guide rail support 1, and calibration target body 4 and sliding guide rail support 1 are slidably connected between;

[0026] Monitoring target body 3, the bottom of monitoring target body 3 is fixedly installed in the top of three-way adjustable support 2, and the front side of monitoring target body 3 and calibration target body 4 is provided with target surface light-emitting area 32, the front side of monitoring target body 3 and calibration target body 4 is provided with target surface non-light-emitting area 31, and target surface non-light-emitting area 31 is sleeved on corresponding target surface light-emitting area 32.

[0027] By the above structure: the whole of the monitoring target body 3 and the calibration target body 4 is cuboid-shaped (the target surface is square, and the thickness is about 1 / 2 of the length of the target surface side), the monitoring target body 3 and the calibration target body 4 adopt waterproof design, the front, back, left, right and top five surfaces are integrally formed shells without joints to prevent rainwater from entering; the bottom surface is detachable, the internal components are convenient to install, there is a silica gel sealing ring between the bottom surface and the shell to form an overall waterproof structure; the front surface (the largest surface) of the monitoring target body 3 and the calibration target body 4 is a square target surface, the target surface adopts a square shape (there are two types of 160mm*160mm and 200mm*200mm), and the appearance feature of the target surface is that there is a white circular pattern in the center of the black square target surface; the target surface light-emitting area is circular and serves as a visual detection and identification area. The target surface light-emitting area 32 is arranged in the center of the target surface, the diameter of the target surface light-emitting area 32 is 1 / 2-2 / 3 of the length of the target surface side, the target surface light-emitting area 32 is white, is made of PC plate and frosted matte material into a uniform light plate, has light transmission, and the diameter of the target surface light-emitting area 32 is 100mm. The target surface light-emitting area 32 is surrounded by a black target surface non-light-emitting area 31, the surface of the target surface non-light-emitting area 31 is covered with a layer of black velvet light-absorbing material to eliminate reflection; the three-way adjustable support 2 and the monitoring target body 3 form a monitoring target, the three-way adjustable support 2 has the functions of front-back tilting, left-right tilting and vertical-axis rotating adjustment of the monitoring target body 3, is locked by screws, and is convenient to adjust and fix the orientation of the monitoring target body 3 during installation; the sliding guide rail support 1 and the calibration target body 4 form a calibration target, the sliding guide rail support 1 is characterized in that a one-shaped crossbeam (aluminum profile with sliding rails) is arranged, one calibration target body 4 is arranged on each of the left and right sides of the crossbeam, and the crossbeam is fixed to the bottom of the target body 3 by screws penetrating the sliding rails and the bolt holes. The front surface of the crossbeam is provided with a scale ruler, the distance between the vertical central axes of the two calibration target bodies 4 can be measured and read. There is a front-back tilting and left-right tilting two-way adjustment support in the center of the crossbeam. The calibration target body 4 is used for calibrating the installation position of the calibration target body 4 in situ, realizes the sub-pixel distance (px) between the center points of the two target surface visual detection areas on the calibration target body 4, calibrates the actual distance (distance unit: mm) between the two center points, and gives the visual monitoring system a proportionality coefficient.

[0028] As a preferred scheme of the utility model, the top of the monitoring target body 3 is fixedly provided with a solar panel 33, the solar panel 33 is square (the four corners are provided with 45° chamfered edges), is fixed to the top surface of the monitoring target body 3, and the length of the monitoring target body 3 is equal to the length of the target surface; the solar panel 33 is arranged towards the target surface to form a shape similar to a duckbill, and the purpose is to shade and block rain for the target surface.

[0029] As a preferred scheme of the utility model, the front end of the solar panel 33 is fixedly installed with a photoresistor, the photoresistor is arranged at the front edge of the solar panel 33 and is used for detecting external light intensity and adjusting the light intensity of the infrared LED lamp in the monitoring target body 3.

[0030] As a preferred scheme of the utility model, the bottom of the monitoring target body 3 is provided with a switch 34 and a DC charging port 35, the switch 34 and the DC charging port 35 can be arranged to switch and charge the monitoring target body 3.

[0031] In the embodiment, the monitoring target body 3 or the calibration target body 4 is provided with a ring-shaped LED lamp plate, a ring-shaped lamp holder (adopting a ring-shaped infrared LED lamp plate, the outer diameter is about 100 mm, the inner diameter is 80 mm, 12 patch infrared LED lamps are arranged at intervals of 30 degrees, are arranged in series, and the positive and negative poles of the lamp plate are connected to the LED lamp driving module of the main control circuit board), a main control circuit board and a rechargeable lithium battery group (adopting a single string 18650 rechargeable lithium battery, and the battery input and output lines are connected to the main control circuit board);

[0032] The ring-shaped lamp holder installs the ring-shaped infrared LED lamp plate in the air on the circular light-emitting area on the inner side of the target surface of the monitoring target body 3 or the calibration target body 4, is concentric with the target surface light-emitting area circle, and the distance between the two is 8 mm (the air height is 8 mm). The effects are as follows: the ring-shaped light-emitting mode ensures that the edge of the target surface light-emitting area of the monitoring target body 3 or the calibration target body 4 can be fully illuminated to form a bright-dark boundary, which is beneficial to the detection and recognition of the machine vision system; the installation in the air avoids that the LED light is too concentrated, the LED light is back-illuminated on the uniform light plate of the target surface light-emitting area, can be homogenized by the uniform light plate, ensures that the light of the outer circle of the target surface of the monitoring target body 3 or the calibration target body 4 is uniform, and does not appear obvious bright spots to affect the work of the machine vision detection system.

[0033] The main control circuit board comprises: a light sensing detection and adjustment module comprising: a main control MCU (adopting an STC8 series single-chip microcomputer), an external adjustment circuit, a solar MPPT charging management module, an LED lamp driving module (adopting a boost voltage boosting circuit structure, the voltage of the lithium battery is boosted to DC 12V-20V, 12 infrared LED lamps can be driven, a constant current circuit is designed, a plurality of sampling resistors are arranged, the current is controlled by the single-chip microcomputer, multi-stage adjustment can be realized, the constant current can ensure that each single LED on the ring-shaped LED lamp plate emits light uniformly, the light-emitting uniformity of the target surface light-emitting area 32 of the monitoring target body 3 or the calibration target body 4 is improved, and the recognition and detection precision of the machine vision system is improved) and a lithium battery protection board (integrating a single string lithium battery protection board, and overcharging and overdischarging of the lithium battery are avoided);

[0034] The light-sensing detection adjusting module: the MCU obtains the light intensity measurement data from the light-dependent resistor, outputs the level control signal through operation, controls the current of the LED lamp driving module, realizes the light adjustment, and realizes that the monitoring target body 3 automatically opens and closes the internal infrared LED lamp according to the external light intensity, and can multi-stage adjust the LED lamp brightness. When the light is too strong, the LED lamp is automatically turned off; when the light is insufficient at night or on cloudy days, the LED lamp is turned on and set to the maximum brightness; in the two cases, the light intensity is adjusted in three levels. The purpose is: to realize that the target surface light-emitting area 32 and the target surface non-light-emitting area 31 can form obvious contrast under different environmental light, which is beneficial to the machine vision system detection; balance the internal battery charging and discharging, and reduce unnecessary power loss.

[0035] The solar MPPT charging management module: connect the solar panel 33 or external DC charging port 35 outside the monitoring target body 3, and efficiently charge the built-in rechargeable lithium battery group of the monitoring target body 3.

[0036] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A machine vision microdisplacement monitoring active target comprising a sliding guide support (1) and a three-way adjustable support (2), characterized in that, The active target further comprises: The calibration target body (4) is arranged on the top of the sliding guide rail support (1) and is in sliding connection with the sliding guide rail support (1); The monitoring target body (3) is fixedly arranged on the top of the three-way adjustable support (2), and the front side of the monitoring target body (3) and the calibration target body (4) is provided with a target surface light-emitting area (32) and a target surface non-light-emitting area (31), and the target surface non-light-emitting area (31) is sleeved on the corresponding target surface light-emitting area (32).

2. The machine vision micro-displacement monitoring active target according to claim 1, wherein, The top of the monitoring target body (3) is fixedly provided with a solar panel (33).

3. A machine vision micro-displacement monitoring active target according to claim 2, wherein, The front end of the solar panel (33) is fixedly provided with a light-dependent resistor.

4. The machine vision micro-displacement monitoring active target according to claim 1, wherein, The bottom of the monitoring target body (3) is provided with a switch (34) and a DC charging port (35).

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