TWI289198B - Image monitoring and stock detection integrated system applied in liquid storage tank and method thereof - Google Patents

Abstract

The present invention relates to an image monitoring and stock detection integrated system applied in a liquid storage tank, which comprises a light reflecting plate floating on the surface of a liquid stored in the liquid storage tank and a digital imaging device for capturing the image picture information including the image graphic of the light reflecting plate, where the distance between the light reflecting plate and the top of the liquid storage tank can be calculated by the relationship between the number of pixels of the light reflecting plate in the image picture information and the actual length of the light reflecting plate. The present invention also provides an image monitoring and stock detection method applied in a liquid storage tank.

Description

1289198 IX. Description of the Invention: [Technical Field] The present invention relates to an image monitoring and stock detection co-construction system applied to a liquid storage tank, which uses a pixel value of an image to calculate the height of the storage liquid, and The physical state of the stored liquid can be monitored simultaneously. [Prior Art] In the prior art, the height measuring device for liquid (water, petroleum or chemical solvent) or powder (plastic powder, flour or powder) used in a storage tank or container, such as the invention patent of the Republic of China The liquid level meter of Announcement No. 200970 and the tin furnace liquid level detecting device of the Republic of China Invention Patent No. 333335, one, the measuring device is placed in a storage tank or a container to measure the storage of the storage material twice . In addition, there is also a way to calculate the reflectance by ultrasonic ranging. 'But the transmitter and receiver of the ultrasonic still need to be connected. Therefore, the conventional reserve height measurement is recommended ^ and the Republic of China invention patent public whistle is The hair r first "light, use to measure;; the second machine; the state of the material outside the storage tank is not inside. But the CCD can simultaneously measure the central position of the top of the tank, and the machine and The laser source needs to be set to the center of the storage surface. Therefore, it is difficult to use the two parallel laser light fields to fix the liquid in the system. The detection and the precise amount can also be used for non-contact distance installation and calibration. The limitation of the method is due to the fact that the parallel laser beam is stored in the center of the groove, and the helmet solution is still used in the use, and the floating plate liquid needs to be fixed to the storage and can be easily changed and can be changed at any time. 5 1289198 and can be easily installed. Contact. Therefore, there is a need for a more sophisticated, measuring system. ~ [Invention] The application of the image (4) _ storage slot, from the digital camera or digital phase conversion = calculate the storage liquid distance, And the present invention provides a liquid storage tank "like the monitoring and storage 1 detection co-construction system;: the liquid level of the liquid stored in the front storage tank; to ^ set · ' = simple - including the aforementioned reflector The image of the image of the image is used to calculate the shadow 4 image of the reflector, the pixel value, and the pixel value of the image image and the maximum photographic pixel value of the image sfl The pixel value ratio of the pixel value is further proportional to the length ratio of the actual length of the reflector and the actual maximum photographic length of the image frame information by using the pixel value ratio to calculate the maximum photographic length of the actual image surface information. And calculating the distance between the reflector and the top of the liquid storage tank according to the aforementioned maximum photographic length and the triangle theorem. In order to achieve the above object, the present invention provides a method for image monitoring and stock detection applied to a liquid storage tank, comprising: capturing image information of an image pattern containing a target object by using a digital image device; and calculating the image pattern The ratio of the pixel value to the pixel value of the pixel value of the maximum photographic pixel value of the image frame information; the ratio of the pixel value to the ratio of the actual length of the target object to the actual maximum photographic length of the image frame information is proportional to the length ratio of 1289198 And calculating a maximum shadow length of the actual image frame information; and calculating a distance between the target object and the digital image device according to the maximum photographic length and a triangle theorem. The invention relates to the image monitoring and stock debt measurement co-construction system applied to the liquid storage tank, which does not need to use two parallel laser lights, nor is it fixed on the same vertical axis, so that the mechanism of the system of the invention Simpler 'installation is easier. Moreover, since the system of the present invention does not have to take into account the optical position, the position where the dot is located, and the degree of erection of the digital camera or digital camera, the system of the present invention does not have to do any high k positive during the measurement. And because the distance of the optical origin is not required, the digital camera or digital camera is not limited to any brand or model. As long as the tea is measured, the distance measurement and image observation can be directly performed. The above-mentioned objects or features of the present invention will be described in detail in the following description, and are not intended to limit the scope of the invention. [Embodiment] It is applied to the image monitoring and storage machine of the liquid storage tank; in the two liquids, the digital camera or the digital phase relationship and the distance == top two linear ratio body = Qiao Time supervision _ Chu Yuyi physical state. Including: two numbers: camera number =, the system architecture diagram of the application example, the digital camera and the machine: the storage slot 200 and the - reflector _. The square, and / / 3⁄4 (10) is erected on the top 201 of the storage tank 2GG, the slot 2 = glass = isolated the digital camera 100 and the storage of a storage avoidance liquid and the digital camera 100 directly 7 1289198 contact to form a non-contact distance Measure. Further, by adjusting the bismuth tempered glass 211 to limit the distance between the liquid level of the stored liquid and the digital camera 100, the liquid level of the stored liquid can be prevented from being higher than the scanning dead zone of the digital camera. The top portion 〇1 of the storage tank 200 further includes a dust cover 21 〇 over the digital camera 100 to isolate the surrounding environment from contamination of the digital camera 100 and the storage tank 200. The dust cover 21 is provided with a projection lamp 221 and 222 to provide internal illumination of the storage tank 200. The reflector 300 is a circular floating plate, and further includes a buoyancy cotton 310 and a gravity hammer 320, wherein the buoyancy cotton 310 provides a buoyancy force to the reflector 300, so that the reflector 300 can be floated thereon. The storage tank 200 stores the liquid surface of the liquid, and the gravity hammer 320 provides a gravity to the reflector 300' to stabilize the shaking of the reflector 300, and the buoyancy cotton 310 provides a buoyancy greater than the gravity hammer 320. The gravity is provided to allow the reflector 300 to float out of the liquid level of the stored liquid. And the upper surface of the reflector 3 is preferably a monochromatic plane, so that the digital camera 2 captures the pixel value and performs distance measurement, and in the embodiment of the invention, the reflector The 300 series is a surface having a yellow color system. When the color of the storage liquid in the interior of the storage tank 200 is not equal, the calculation unit 40 can easily calculate the circular area of the surface of the reflector 3 by second-ordering the image. With the digital camera 100, the physical state of the liquid stored inside the storage tank 200 can be observed or the reaction process can be recorded, and the height of the storage liquid can be measured at the same time. Since the reflector 300 will rise and fall with the level of the liquid level of the stored liquid, the area of the image pattern of the reflector 300 in the image information captured by the digital camera 100 also changes. Therefore, the calculation unit 4 can calculate the height of the reflector 3 289 8 1289198 at the time of the image pattern of the reflector 300. Moreover, since the reflector 300 is a circular floating plate, the setting direction and position of the digital camera 1 are not limited. Referring to the second figure, a schematic diagram of pixel value and distance conversion of the image pattern of the reflector 300, wherein the reflector 300 is further a circular plate, and the pixel value of the diameter of the reflector 300 can be calculated. The reflector 300 is at a height from the top 201 of the storage tank 200. The image of the image monitoring and stock detection co-construction system used in the liquid storage tank is shown in the following figure:

OP: optical origin of the digital camera 100;

Pi, Pj: different positions of the reflector 300; &, ~: the distance between the Pi and Pj and the surface of the digital camera 100; the palpebral optical origin OP and the digital camera The distance of the surface of 100 is wide: the radius of the reflector 300; ': the maximum angle that the digital camera 100 can photograph; (3⁄4): the reflector 300 is at the position Pi, p Fudan / image diameter Pixel value; 1 j Shadow: The maximum length of the digital camera that can be photographed; and the heart of the face information (^>): the maximum photographic pixel value of the video book of the digital camera 100. Since the image of the image information captured by the digital camera 100 has a linear proportional relationship with the horizontal distance of the object to be scanned, 'the size of the pixel value represents the horizontal distance of the reflector 300. The linearity proportional relationship can be seen that the ratio of the horizontal distance (2r) of the reflector 300 to the shadow length/) (3⁄4) of the Tiankang Haihai 9 1289198 is the pixel value of the reflector 300 (凡仇;, #/¥ ) The same as the ratio of the maximum photographic pixel value and horse "/^), refer to the following relationship: D(ht) =

Regardless of the length of the photographic distance of the digital camera 100, the image size of the image information captured by the digital camera 100 is equal, that is, the pixel values of each scanning line are equal, so that the following relationship can be obtained:

Nd ) = Nd (hj) = Ns (max) m)=M^〇x2r N person D%) = # Reference triangle theorem and the result of the above relationship can be used to represent the value of &, as the following relation: K =-i)(^)cot05-/zo K (max) Nr{K) xrxcot05 -h0 hj = — D{hj)cotes -h0 乂(max) Nr(hj) xrxcot9s -h0 where COi is long, know The two parameter values can be calculated in advance by a calculation model. Therefore, after counting the TV/Zy value, the value of /2···· can be obtained. 1289198 Referring to the third figure, the system architecture diagram of the calculation model for calculating two parameter values includes two sets of vertical scales 411, 412 and two sets of horizontal scales 421, 422, wherein the horizontal scales 421, 422 are respectively The vertical distance of the surface of the digital camera 100 is, and the vertical distance Aw can be easily measured by the vertical scales 411, 412, and the digital camera 100 is at the maximum level of the horizontal scales 421, 422. The photographic distance can be easily measured by the horizontal scales and expressed as Dm2. The value of /z0+/^2 can be obtained from the triangle theorem, such as the following relation: K + Kl = ^ Drnl C〇t^s h0 + Kl = ^ Dml ^ due to the vertical scales 411, 412 and horizontal The values of the measuring rods 421 and 422 can be easily obtained, so that the μ-shaped and the two parameter values can be obtained, such as the following relationship:

C〇tA=2H

Dm2 ~ Dml h _ KlDm\ ~K\Dm2 〇' Dm2-Dml Referring to FIG. 4A to FIG. 4D are schematic diagrams of scanning lines of the horizontal angle of the digital camera 100, when the reflector 300 is circular and the digit When the camera 100 is vertically photographed on the surface of the storage liquid of the storage tank 200, regardless of the horizontal angle of the digital camera 100, and regardless of whether the tank of the storage tank 200 is square or circular, the reflector is not affected. 300 11 1289198 The image of the pixel image of the image is monitored and stocked ^ = ¥ The liquid storage tank system of the present invention is more practical and simple, so that the fifth picture of the present invention is the image 5〇 At 1 o'clock, the area is calculated and the flow chart of the ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ The yellow color information is used for color difference filtering to compare the chromaticity of the same color system; in the process 504, check whether the chromaticity of the pixel taken by the item is within the critical value, if L Day, then the process "505, if it is, then proceed to process 50 6; in the process. Inch, then, judge the next reading value and turn to the flow 5〇4; in the 1st step 506, start the pixel counting function to count the pixel value; in the process 507 犄, check whether the full screen has been completed Confirm, if not, proceed to process 5〇8, if yes, proceed to process 5〇9; at process 5〇8, continue to judge the next reading value and revert to process 504; and in process 5〇9, The total pixel value is converted into the area of the image pattern. When the reflector 300 is at the top 201 of the storage tank 200, the data is filtered because all the read image information is filtered. The pixel is located within the set threshold value, and the pixel can be regarded as the pixel of the image pattern of the reflector 300. At this time, the sum of the pixel values of all the counted yellow color systems (ΣΛ^) represents the reflection. The area of the image pattern of the board 300, and K/2J can be regarded as the pixel value occupied by the diameter of the reflector 300. Since the reflector 300 can be located at any position below the same distance (/ζζ·), the following That is, the inspection is under the same distance (\·) The position of the reflector is located 300,121,289,198 plastic shadow calculation result of the system of the present invention, when the diameter of the reflecting plate 300 and ㈣155 iU cm cm, available statistics of the following table:

When the diameter of the reflecting plate 300 is 1 U cm and & is -, the statistics of the following table are obtained:

The error amount is defined as: 士Σ雄)-雄) 丄N n=\_ :100% m According to the definition of error and quantity, it can be confirmed that under the same-distance (6), the location of the light lion is on the present invention. The system is large and its error is acceptable. T—U is not the result. When the reflector 300 is in the & position, the area of the image pattern of the light panel 300, and the diameter of the image representing the 6-ray inverse image, can be obtained. of

Nr (^) = 2 X. π Since the present invention first counts the image map, and then uses the relationship between the area and the radius, 3〇 = the pixel value of the diameter (object), so the method of calculating the nose can be Avoid uncertainty in measurement results. After the value of AW is known, since c_s, the two parameter values 13 1289198 are known values calculated in advance, so the value of & can be calculated according to the following relation: w〇tes-h 〇

Generally, the height of the stored liquid refers to the distance from the liquid level of the storage liquid to the bottom of the storage tank. Therefore, reference is made to the figure, wherein Ρβ is the position of the upper surface of the reflector 300 when it is placed on the liquid surface. The upper surface of 2〇2 is the position of the upper surface of the reflector 300 when it is placed at the bottom 202. Therefore, /zg is the (4) of the surface above the reflector $(8) and the surface of the digital camera 1GG when the reflector 300 is located at />, and the reflector 300 is located when the reflector 300 is located at W. The distance between the upper surface and the surface of the digital camera is fast, and the height is the structural thickness of the reflector 3, so the height of the storage liquid of the storage tank 200 can be expressed as follows: Η明=hg- Ha+Hbg

Kmax) AT "max" From the above relationship, the calculation of the height of the stored liquid does not require a known parameter value, and thus can represent the system of the present invention, which is not limited by the position of the optical origin OP. Moreover, the mounting height of the camera 100 does not affect the measurement, so that the installation and mounting of the system of the present invention is very easy. The system of the present invention is actually a sony P10 for the digital camera 100. Actual measurement, using the system architecture diagram shown in the third figure to establish the parameter value printing paper = 0.731 'and the resolution of the digital camera is 2〇48*1536, so the maximum photographic pixel value of each scanning line is Μ ; 2 〇 48, and the radius of the reflector 300 is cm, so the results are as follows: - actual height ^ ~ 155 ~ 14 1289198

Nr(ha) 107.23 84.50 Measurement height --------___ 154.97 ----- 196.66 Error amount % 0.019 0.173 - Therefore, even when the reflector 300 is not fixed, and is located in the storage tank 200 The error obtained by the measurement results of the present invention is still very small at any position of the liquid level of the internal storage liquid. In the current distance measurement method of automated machining systems, incremental optical gauges are almost always used as distance measurement tools in various automatic machining machines. However, in the use of the optical scale, the movement of the sensing head must be driven for optical measurement, and the movement of the sensing head is liable to cause friction, and causes errors due to vibration and zero correction during measurement. Therefore, the present invention can be further applied to the method of applying the image monitoring and stock detection co-construction system of the liquid storage tank to the automated processing system to improve the above problems. Reference Fig. 6 is a system architecture diagram of an embodiment of a distance measuring method for applying the present invention to an automated processing system. In this embodiment, a fixed area standard area reference plate 6〇1 is attached to a processing device 603 to achieve the function of the reflector of the system of the present invention, and the processing platform 602 is horizontally moved to Fixing the action of the workpiece to be processed on the surface. In this embodiment, a digital camera 100 is also mounted on one side of the standard plane reference board 601, and the area of the image pattern formed by the standard area reference board 6〇1 in the image plane of the digital camera 100 is used. Represents the distance of the digital camera 100 from the standard area reference plate 601. Since both the start point (A) and the end point (B) of the processing range of the processing apparatus 603 are directly pre-set, and when the processing apparatus 603 is located above a and b, the image patterns thereof can be expressed as Σ & 15 1289198 In the case of the Bay, the maximum range of the standard area reference plate (6) is selected according to the resolution of the distance to be measured (the smallest unit of measurement), t= to the highest measurement, square, can With each scan: ===6. 1 i for this distance can avoid the vibration according to the second reference seventh picture is the standard area reference plate 6 C schematic, wherein the standard area reference plate 601,: long For 々, and there are a total of moxibustion scans, lines, so you can get a relationship ς 疋 and find the standard area of the reference plate 6 () 1 moving distance under the 'Asian Κ h, ha, m) K (ha) = ^ ~— Κ If you have 2 〇〇 ί ί 以 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Therefore, the measurement resolution will reach the resolution above μιη). Therefore, the application of the system of the present invention to the design and manufacture of various dynamic automated processing equipment can also provide an accurate and arbitrarily detachable distance measuring system, thereby making the system and application of the present invention more flexible. In summary, the image monitoring fish stock detection co-construction system applied to the liquid storage tank is a non-contact distance measuring system, which can avoid the public security risk caused by the contact between the worker and the storage liquid during operation. Moreover, since the system of the present invention does not have to use two parallel laser lights, it is not necessary to fix the floating plate on the same vertical axis, which makes the mechanism of the measuring system simpler and easier to install. And because it is not necessary to consider the position of the optical origin of the digital camera, and it is not necessary to consider the height of the top of the slot, the height of the 16 1289198 is corrected during the measurement. And because there is no distance from the optical origin of the f, the number (10) of the camera or the phase of the money is limited to any product: the establishment of the measurement parameter can be substituted into the digital photography "S t ax", and directly The invention can be used to test the pure towel of the present invention, and the present invention can be applied to various automatic weighting, as a precise distance ^ can be observed by the image drawing *, and it is known that the invention is described in detail. After the preferred embodiment, familiar with I clearly understands 'there are variations and changes without departing from the following t, and the implementation of the embodiment of the present arsenic. The material U is not _, the book

17 1289198 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a system architecture diagram of a preferred embodiment of the present invention; the second diagram is a schematic diagram of pixel value and distance conversion; and the third figure is a system architecture diagram of a calculation model for calculating parameter values. 4A is a schematic diagram of the digital camera at a horizontal angle and a scan line of the reflector at /2/distance; FIG. 4B is a schematic diagram of the digital camera at a horizontal angle and a scan line of the reflector at a % distance; The fourth C picture is a schematic diagram of the scanning line of the digital camera at an oblique angle and the distance of the reflector; the fourth D is a schematic diagram of the digital camera at an oblique angle and a scanning line of the reflector in the &distance; A flowchart of a graph area calculation; a sixth diagram is a system architecture diagram of another embodiment of the present invention; and a seventh diagram is a schematic diagram of a scan line of a standard area reference board. Representative symbols of the main parts: 100-digit camera> 200... Storage tank 201... Storage tank top 202... Storage tank bottom 210 - Dust cover 211 - Reinforced glass 221, 222... Projection lamp 300 - Reflector 310 - Buoyancy cotton 320 ...gravity hammer 18 1289198 411, 412... vertical scale 421, 422... horizontal scale 500 - area calculation algorithm 501~50 9 - flow 601 - standard area reference plate 602... work platform 603... processing equipment 604 - to be processed 605- fixed

19

Claims (1)

1289198 X. Patent application scope: ' 1. A video surveillance and stock detection co-construction system applied to a liquid storage tank, comprising: a reflector, a liquid surface floating on the liquid stored in the liquid storage tank; a digital image device for capturing image information of an image pattern including the reflector; wherein the image of the image of the reflector is calculated by using the image information of the reflector, and the pixel value of the image is calculated a pixel value ratio of a pixel value of a maximum photographic pixel value of the image facet information, and further proportional to a length ratio of the actual length of the reflector and the actual maximum photographic length of the image frame information by using the pixel value ratio Calculating a maximum photographic length of the actual image frame information, and calculating a distance between the reflector and the top of the liquid storage tank according to the maximum photographic length and a triangle theorem. 2. The image monitoring and storage detection co-construction system applied to a liquid storage tank according to the first application of the patent scope, wherein the digital image device can be a digital camera or a digital camera. 3. The image monitoring and stock detection co-construction system applied to a liquid storage tank according to claim 1, wherein the upper surface of the reflector is a flat surface having a monochromatic system. 4. The image monitoring and stock detection co-construction system applied to a liquid storage tank according to the first application of the patent scope, wherein the reflector is a circular flat 20 1289198 board. .5. The image monitoring and stock detection co-construction system applied to a liquid storage tank according to claim 1, wherein the reflector further comprises a floating body for providing the foregoing Reflector buoyancy. 6. The image monitoring and stock detection co-construction system applied to a liquid storage tank according to the third, fourth or fourth aspect of the application, wherein the reflective plate further comprises a gravity hammer for stabilizing the foregoing Reflector. 7. The image monitoring and stock detection co-construction system for liquid storage tanks according to claim 1, wherein the liquid storage tank further comprises a technical light to increase the brightness of the interior of the liquid storage tank. 8. The image monitoring and storage detecting co-construction system applied to a liquid storage tank according to claim 1, wherein the digital image device is disposed at the top of the liquid storage tank and is insulated by a transparent partition. The spring digital image device and the liquid stored in the liquid storage tank. 9. A method for image monitoring and stock detection applied to a liquid storage tank, comprising: capturing image information of an image pattern containing a target object by using a digital image device; p calculating a pixel value of the image pattern and the image The ratio of the pixel value of the pixel value of the maximum photographic pixel value; and the ratio of the length of the pixel value to the actual length of the target object and the actual maximum photographic length of the monthly image information is 21