CN101118217A - Vieri experiment indicator paper colors identification device - Google Patents
Vieri experiment indicator paper colors identification device Download PDFInfo
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Abstract
The present invention discloses a test paper color identification device in a Christian Vieri experiment, and comprises a sample cup position synchronous coder, a lighting assembly, a 3CCD color video camera and an industrial control machine which is programmed with an image processing and color distinguish software bag. The sample cup position synchronous coder is used to offer being location signal that the sample cup is just opposite to the observing window of a Christian Vieri experiment calorstat. A still image of the sample cup test paper which is just opposite to the observing window can be captured by the image processing and color distinguish software bag from the video output of the 3CCD color video camera, and the image is intercepted, calculated and identified. The color marker of the test paper in the sample cup at the current hour is finally obtained. The present invention has the main advantages that the influence which is generated by the brightness of illumination to the color identification is effectively eliminated. The precision is high, the speed is fast and the repeatability is good in the color identification. So the uncertainty of the fixed value in the Christian Vieri experiment is effectively reduced. The invention founds a base for the automatization of the operation of the Christian Vieri experiment and the quantitative transmission of the identified standard of the test paper color.
Description
Technical Field
The invention belongs to the technical field of machine vision, and mainly relates to a measuring device based on video image processing and applied to automatic identification of colors of test paper for powder dimension and Vieri tests.
Technical Field
The Vieri test, also known as litmus paper test, is a basic method for testing the stability of gunpowder based on nitrate. The principle is as follows: putting a certain amount of gunpowder sample into a Vicia sample cup with litmus test paper, sealing, putting the sample cup into a thermostat with the temperature of 106.5 +/-0.5 ℃, heating, and observing NO released by decomposition of the sample 2 The stability of gunpowder or nitrocellulose is judged by the time when the litmus paper reacts to change the color of the litmus paper. The main advantages of the test method are stable result and high reliability, has been applied for nearly a hundred years, and is still one of the main methods for judging the stability of the gunpowder in many countries.
When performing Vieri test according to the national military standard GJB 770A-97, a special Vieri test thermostat is adopted, and sample cups (generally 10-15 samples per time) containing gunpowder samples and litmus test paper are arranged on a rotating bracket in the thermostat, and the bracket rotates at the speed of 5-8 revolutions per minute. When a sample is heated in a thermostat, litmus test paper gradually changes from initial blue to red, and the color of the test paper is judged in six grades according to the requirements of test standards: "L-blue", "Lz-bluish purple", "Z-purple", "Zm-purple rose", "M-rose", "Ho-red". Because the litmus test paper is coiled in the sample cup, two sides of the litmus test paper are overlapped to a certain extent, and the color change of the overlapped part of the litmus test paper lags behind the non-overlapped part in the test process; meanwhile, the test paper has reticulate patterns, so that the color change is inconsistent. The operator distinguishes the color of the overlapped part of the test paper in each sample cup through the observation window of the thermostat every 30 minutes, records the color mark of the overlapped part of the test paper at each observation moment according to the six color grades until seven hours are reached, or the color of the test paper is changed from initial blue to red or brown smoke is emitted by the sample, the sample cup can be taken out for ventilation and cooling, and then the next round of test is carried out. The testing process for a set of samples typically takes several tens of hours.
For a long time, the thermostat and the manual test mode introduced by the original Soviet Union are used in China, and the judgment of the color of the test paper depends on the visual identification of an operator. Because the manual naked eye judgment is difficult to strictly regulate a uniform color reference, an effective quantity value transmission method is lacked, although measures such as standard medicines, standard test paper, a uniform operation meeting of operators held regularly and the like are adopted, the essential defects of low measurement precision and large human error still exist; meanwhile, due to the fact that the duration of the test is long, operators need to change shifts, and color discrimination errors of different operators caused by illumination differences, visual fatigue of the operators and shift changes are increased. At present, under the mode of manual naked eye discrimination, the uncertainty of the fixed value of the dimension and Ri test can only reach 10-15% for gunpowder standard substances and standard test paper.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the essential defect that the color of the test paper is identified by manual naked eyes in the existing Vieri test, the Vieri test paper color identification device adopting the computer digital color identification technology is provided. The device can quantitatively judge the color change of the test paper, and reduce the uncertainty of the dimensional change test definite value, thereby laying a foundation for the automation of the dimensional change test operation and the quantitative transmission of the test paper color judgment reference.
In order to solve the technical problem, the invention comprises a sample cup position synchronous encoder comprising an encoding disc and two photoelectric converters, an illumination assembly comprising an illuminating lamp and an illuminating lamp power supply, a 3CCD color camera, an industrial control machine provided with a switching value input card, a switching value output card, an RGB (red, green and blue) tricolor video acquisition card and an image processing and color distinguishing software package, wherein the encoding disc is fixedly connected with a rotating shaft of a sample cup bracket in a Vieri test thermostat and is provided with an encoding groove and an encoding hole which are the same in number and correspond to the sample cup holes in the sample cup bracket in position; the lighting assembly and the 3CCD color camera are arranged right opposite to an observation window of the Vieri test thermostat, and a lighting lamp power supply and a camera power supply of the lighting assembly and the 3CCD color camera are respectively connected with a first solid-state relay and a second solid-state relay on the switching value output card; the image processing and color distinguishing software comprises a color marking database, a test result database, a parameter setting module, a power supply control module, a display module, a sample cup synchronous signal processing module, an image capturing module and a color identifying module: the color marking database stores the ratio of red to blue corresponding to six color grades of dozens of sample types; the test result database stores test paper color data and identification results collected at each moment; the parameter setting module is used for setting the drug type parameters of the samples placed in the sample cups during the test; the power supply control module correspondingly controls the first solid-state relay and the second solid-state relay to switch on or off the power supply of the lighting lamp and the power supply of the camera when a test period begins or ends; the display module collects the video output of the 3CCD color camera through a three-primary-color video capture card, displays the on-site dynamic image of the test paper of the sample cup through the display screen in a test period all the time, and displays the color mark of the test paper in each sample cup after the test period is finished; the sample cup synchronous signal processing module has the functions of calling the image capturing module when the switching value input card is inquired to have a switching value signal, judging whether the sample cup which is opposite to the observation window currently is a sample cup with test paper or not according to the path number of the switching value signal, and calling the color identification module if the sample cup is judged to be the sample cup with the test paper; the image capturing module captures a still image of a frame of test paper of the sample cup through an RGB (red, green and blue) tricolor video capture card and stores the still image into a frame buffer area; the color identification module has the functions of selecting a current frame of static image in a frame buffer area, intercepting a fixed rectangular area with test paper overlapped part images, solving the respective average value of RGB tricolor for all pixels in the fixed rectangular area, then solving the ratio of the red average value to the blue average value, comparing the ratio with the reference data of six grades of corresponding test paper colors of a sample in the color marking database, determining the color marking of the test paper in the current sample cup at the moment, and storing the judgment result in the test result database in a list form.
According to the invention, the size of the on-site dynamic image of the sample cup test paper is 192 multiplied by 144 pixels; the fixed rectangular area is 44 × 64 pixels.
The present invention has the following advantages.
The average value of RGB three primary colors is obtained by all pixels in a fixed rectangular area corresponding to the overlapped part of the test paper in the captured static image, and the average value is used as basic data of the color of the test paper, so that the inconsistency of color change caused by the existence of the reticulate patterns on the test paper is effectively eliminated.
And (II) the ratio of the red average value to the blue average value is calculated to be used as the basis for judging the color of the test paper, the objective rule that the litmus test paper is gradually changed from initial blue to red in the test process is met, and the litmus test paper has a large color resolution range. Meanwhile, the ratio is adopted instead of the numerical value of some colors as the basis for judgment, so that the influence of the illumination brightness on the tristimulus values can be effectively eliminated.
The invention adopts a 3CCD color camera and an RGB three-primary-color video capture card, and the three primary colors have respective independent light paths, signal conditioners, transmission lines and A/D converters, thereby ensuring the digitization accuracy of color and color signals; the invention is adopted to repeatedly collect and process the standard color blocks with different colors, thereby reducing the uncertainty of the dimensional and Vieri test definite value.
The invention can be used as a core device of a complete set of automatic measurement and control system for Vieri test, changes the operation mode of continuously distinguishing test paper by artificial naked eyes for a long time, and eliminates the essential defect of human error; the method lays a foundation for realizing quantitative transfer and operation automation of the Vieri test quantity value.
And (V) the invention can also be transplanted and applied to other chemical fields, and has wider application prospect.
Drawings
FIG. 1 is a schematic diagram of the color identification device of Vieri test paper according to the present invention.
Fig. 2 is a schematic diagram of the composition of the synchronous encoder for the position of the sample cup shown in fig. 1.
Fig. 3 is a schematic diagram of the composition of the lamp assembly shown in fig. 1.
Fig. 4 is a schematic diagram of test paper RGB tricolor video signal acquisition.
Fig. 5 is a flow chart of the main program of the image processing and color discrimination software package of the present invention.
Fig. 6 is a test result at a certain time displayed on a screen by the preferred embodiment of the present invention.
FIG. 7 is a flow diagram of the color recognition module shown in FIG. 5.
FIG. 8 is a graph showing the variation of the mean value of the three primary colors of the test paper color for a certain gunpowder sample according to the preferred embodiment of the present invention.
Detailed Description
As shown in fig. 1, the preferred embodiment of the present invention comprises a cuvette position synchronous encoder, an illumination assembly, a 3CCD color camera, an industrial control machine. The sample cup position synchronous encoder is arranged at the lower part of the Vieri test thermostat, the lighting assembly and the 3CCD color camera are over against an observation window of the Vieri test thermostat, and the industrial control machine completes the operations of image capture, signal processing, color identification and the like of a sample cup with litmus test paper at a corresponding position in the Vieri test thermostat according to an output signal of the sample cup position synchronous encoder.
As shown in fig. 2, the cuvette position synchronous encoder includes an encoder disk 1, a first photoelectric converter 2, and a second photoelectric converter 3. The coding disc 1 is a metal disc with a shaft hole, is fixedly connected to a rotating shaft of the Vieri test thermostat and can synchronously rotate with a sample cup bracket; the disc is provided with a plurality of coding grooves 1-1 and a coding hole 1-2, the coding grooves 1-1 are uniformly distributed at the outer edge of the disc, the specific number of the coding grooves 1-1 is the same as the number of the sample cup placing holes on the sample cup bracket, and the positions of the coding grooves are in one-to-one correspondence; the coding hole 1-2 is positioned on the radial line of one coding groove 1-1 on the other side of the shaft hole and is offset towards the direction of the shaft hole so as to be staggered with the adjacent coding groove 1-1. At present, the Vieri test thermostat in the laboratory uses an eleven-hole sample cup holder, wherein, a sample cup inserted with a temperature measuring platinum resistor is placed in a hole 0, and a sample cup filled with test paper is placed in holes 1 to 10 (when placing the sample cup, the side of the sample cup where the overlapped part of the test paper can be seen is positioned on the outer circumference side of the sample cup holder, and the overlapped part of the test paper is centered), therefore, eleven coding grooves 1-1 are arranged on the code disk 1 of the preferred embodiment, and when installing, the coding groove 1-1 with the coding hole 1-2 on the radial line is aligned with the insertion position of the hole 0 on the sample cup holder. The first photoelectric converter 2 is arranged on the body at one side of the observation window of the Vieri test thermostat, the light emitting tube and the photoelectric conversion tube of the first photoelectric converter are respectively positioned at the upper end and the lower end of the coding disc 1, the radial positions of the light emitting tube and the photoelectric conversion tube correspond to the coding groove 1-1, the second photoelectric converter 3 and the first photoelectric converter 2 are arranged on the body of the Vieri test thermostat at an interval of 180 degrees, the light emitting tube and the photoelectric conversion tube of the second photoelectric converter are respectively positioned at the upper end and the lower end of the coding disc 1, and the radial positions of the light emitting tube and the photoelectric conversion tube correspond to the coding hole 1-2. When a motor in the Vieri test thermostat drives a sample cup support to rotate to a position where one sample cup is opposite to a 3CCD color camera, a photoelectric conversion tube of a first photoelectric converter 2 receives light emitted by a light emitting tube through a coding groove 1-1, the light is converted into a high level signal and sent to an information acquisition and control system, and the first photoelectric converter 2 can generate eleven pulse signals every time the sample cup support rotates for one circle. When the No. 0 hole of the sample cup support is rotated to a position opposite to the 3CCD color camera, the photoelectric conversion tube of the second photoelectric converter 3 receives light rays emitted by the light emitting tube through the coding hole 1-2, the light rays are converted into high level signals to be sent to the information acquisition and control system, and the second photoelectric converter 3 only generates one pulse signal when the sample cup support rotates for one circle. When the industrial control machine receives two paths of signals at the same time, the signals are high level, and the image shot by the current 3CCD color camera is confirmed to be the image of the sample cup with the platinum resistance for temperature measurement. When the industrial control machine receives the high level of the first signal, the current 3CCD color camera is confirmed to shoot an image of the test paper of the sample cup (and the image of the overlapped part of the test paper is positioned in the middle of the image).
According to fig. 3, the lighting assembly includes a lighting lamp power supply and filter, a metal halogen bulb, a light-gathering cover, and a light-gathering lens, and functions to provide a stable lighting source for the test paper image collected by the camera. In the preferred embodiment, the power supply of the lighting lamp adopts a 5V switching voltage-stabilized power supply, and a pi filter is added at the output end. The metal halogen bulb is selected as the lighting bulb, has the characteristics of high efficiency, high color rendering, high color temperature and short arc distance, and is suitable for intermittent lighting of low-voltage instruments in a laboratory environment. The light-gathering cover and the light-gathering lens gather the light into a beam of approximately parallel light which vertically irradiates an observation window of the Vieri experiment thermostat, and the window is double-layer glass coated with an optical film. The parallel light beams are subjected to multiple reflections on the upper glass of the sample cup, the support wall of the sample cup and the inner wall of the thermostat after penetrating through the observation window, so that diffused light is formed to illuminate the lower part of the sample cup, and reflected light generated by external light at a test paper image part is effectively avoided. Except the lighting lamp light, the whole observation window and the camera are covered by shading cloth so as to eliminate the influence of other external light rays on the color judgment of the test paper.
As shown in fig. 4, the 3CCD color camera selected in the preferred embodiment uses a 12V switching regulated power supply and a pi filter as a power supply, and its main technical indexes are: CCD chip 3 × 1/3', 752 × 582 pixels, horizontal resolution 570TV line, signal-to-noise ratio > 54db; the working principle is that the target image is converged to a color separation prism by a lens, then is separated into independent RGB three-color light by the color separation prism, and the RGB three-color light respectively irradiates corresponding area array CCDs, and the three color separation video signals are modulated by independent circuit boards and then are output to an information acquisition and control system together with a synchronous signal.
In this embodiment, a switching value input card, a switching value output card, and an RGB three-primary-color video capture card are inserted into the industrial controller, and an image processing and color identification software package including a color mark database, a test result database, a sample cup synchronization signal processing module, a power control module, an image capture module, a color identification module, a display module, and a parameter setting module is built in the industrial controller. The switching value input card can convert high level signals output by the first photoelectric converter and the second photoelectric converter into two switching value signals and send the two switching value signals to the sample cup synchronous signal processing module, and the main technical indexes of the switching value input card are as follows: the input voltage is 5-24V, the maximum input current is 60mA, the input is isolated, and the input impedance is 1.2k omega. The switching value output card is provided with two switching output channels, wherein: the first switch output channel controls the first solid-state relay according to an instruction sent by the control module, so that the power supply of the lighting lamp is switched on or switched off; the second switch output channel controls the second solid-state relay according to the instruction sent by the control module, so that the stabilized voltage power supply of the 3CCD color camera is switched on or switched off, and the main technical indexes of the switching value output card are as follows: relay class 8SPST, contact rated voltage 24VDC, current 1A. The RGB three-primary-color video capture card is provided with three paths of preamplifiers, A/D converters and auxiliary circuits which are respectively independent, and the main technical indexes are as follows: the 6 software-selectable A/D conversion channels support two paths of RGB video signals, 1 path of single synchronous signal channel, an RGB 8; the three color-separated video signals output by the 3CCD color camera are converted into three 8-bit digital video signals by an RGB three-primary-color video capture card. The color mark database stores the ratio of red to blue corresponding to six color grades of dozens of sample types, and the data can be obtained by a large number of experimental operations and statistical analysis of experimental results or obtained by quantity transmission of a last-level Vieri test metering device.
Fig. 5 shows the main flow of the information collection and control system software program. When the invention is adopted to carry out the Vieri test, because the color discrimination standards of the Vieri test paper of different drug types are different, before the test, the drug type parameters in each sample cup on the sample bracket in the current batch are input into the parameter setting module through the keyboard of the industrial control machine. When the test is started, the timing system is started first and the current time is displayed on the display screen of the industrial control machine. When the timing reaches 1 minute before the specified test paper color distinguishing time, the power control module controls a first solid-state relay and a second solid-state relay on the switching value output card to respectively switch on the illuminating lamp and the power of the 3CCD color camera, so that the brightness of the illuminating lamp and the circuit performance in the camera reach a stable state before the image is collected; meanwhile, preparation is made for color discrimination at the current moment, namely a group of digital images retained by previous color discrimination in a frame buffer area are eliminated, relevant data in the color identification processing process temporarily stored in the previous discrimination process in the memory are eliminated, and color data and color marks of test paper of each sample cup in the previous discrimination process displayed in the display screen are eliminated. Then, the display module receives the digital video signal output by the RGB three-primary-color video capture card, and captures the central part (192 × 144 pixels) of the image to display the dynamic field image through the display screen. When the timing reaches the specified test paper color judging time, the sample cup synchronous signal processing module is started, and whether the switching value input card has an interrupt signal or not is continuously inquired. Once the switching value input card sends an interrupt signal, the synchronous signal processing module judges whether a sample cup inserted with a temperature measuring platinum resistor (namely the position of a No. 0 hole of the bracket) or a certain sample cup placed with a test sample and test paper is opposite to the observation window at the moment according to the levels of the two switching value signals. If the position is the position of the No. 0 hole of the bracket, clearing the number variable of the current sample cup in the memory; if only the signal of the first photoelectric converter 2 is at a high level, namely one of the holes 1 to 10 of the bracket is over against the observation window, the variable of the current sample cup number in the memory is increased progressively, and the video signal at the moment is the test paper image of the current sample cup number. If the color of the test paper of the sample cup is not judged, calling an image capture module to capture a frame of still image divided into three monochromatic images of red, blue and green from the output of the RGB three-primary-color video capture card, and capturing 192 multiplied by 144 pixels from the middle part to store the pixels in a frame buffer area; and calling a color identification module to complete color identification of the test paper image. And then the program continuously inquires whether the switching value input card has an interrupt signal or not until the test paper image colors of all the sample cups are completely judged. If the color of the test paper images of all the sample cups is completely judged, the program marks the three-primary-color numerical values and the colors of the test paper in all the sample cups at the current moment on a display screen for displaying (see figure 6), and simultaneously stores the test results into a test result database in a list form. And then, the program can repeatedly cycle the test period from the timing step until seven hours are reached or the test is finished.
Fig. 7 shows a color discrimination subroutine flowchart of the present invention. When the main process judges that the current captured image is a test paper image, the color identification module is started. The module firstly intercepts a rectangular frame of 44 multiplied by 64 pixels from red, green and blue image data stored in a frame buffer area, and the image of the rectangular frame is the image of a test paper overlapping part; the average value of the primary colors of all the pixels in the rectangular frame of the three monochromatic still images is obtained by adopting the following formulas respectively:
in the formula (I), the compound is shown in the specification, 
respectively, the average values r of red, green and blue obtained for m rows by n columns of pixels ij 、g ij 、b ij Respectively representing the red, green and blue values of the jth pixel of the ith row, and solving the ratio of the red average value to the blue average value according to the following formula.
The color identification module calls test paper color datum data of corresponding medicine types from the color mark database according to the medicine type parameters set by the parameter setting module, namely the ratio of red to blue corresponding to the six color grades is compared with the delta value calculated by the module, the test paper color at the moment is determined to belong to the color section, and the color mark of the test paper is judged.
The Vieri test uses litmus paper, which decomposes to release NO when heated in a sealed sample cup 2 The color of the test paper is changed from initial bluish to reddish by the action of litmus test paper. The color of the test paper is not completely the same because of the different additives and proportions of the additives in different types of gunpowder, but the color of the litmus test paper is not the sameThe objective rule of gradually changing from blue to red is determined by the nature of litmus paper. Fig. 8 is a curve of the average change of the three primary colors of the test paper color measured in a single dimension-also-test of a certain gunpowder sample, the abscissa is the number of times of the test paper color discrimination, each time is separated by half an hour, and the ordinate is the primary color value. It can be seen that, after the separation of the three primary colors, the green component of litmus paper changes little in the test process within 7 hours, the red color gradually increases, and the blue color decreases. In this example, the test paper color changed from bluish purple (Lz) to rose (M), the average red color changed from 91.27 to 109.02, 19.45%, the average green color changed from 80.75 to 86.08, 6.6%, the average blue color changed from 87.37 to 79.55, changing by-8.95%, and thus the human eye felt that the test paper color gradually changed from blue to red. Meanwhile, the color temperature and the illumination of an external light source have great influence on the values of the three primary colors, the illumination of light rays is changed, the brightness of the whole test paper image is changed, and the three primary color values correspondingly rise and fall. Through tests of different processing methods, the ratio of the red average value to the blue average value is used as a judgment basis for judging the mark of the color of the test paper, so that the influence of the illumination brightness on the tristimulus values can be effectively eliminated. Meanwhile, the ratio of the red average value to the blue average value is changed in a large range, so that the change of the color of litmus paper can be effectively distinguished. In this example, the ratio of the red average to the blue average changed from 1.045 to 1.37 by 31.1%.
The technical indexes achieved by the preferred embodiment are as follows:
the standard deviation of the measurement repeatability is less than 3 percent,
the measurement time for one sample cup test paper was 0.5 seconds.
The measurement repeatability standard deviation refers to the statistical deviation of the ratio of the red average value to the blue average value found by repeated measurements on standard color blocks.
Claims (2)
1. The utility model provides a dimension is experimental test paper colour identification device also, its characterized in that: the device comprises a sample cup position synchronous encoder comprising an encoding disc [1] and two photoelectric converters [2 and 3], an illuminating assembly comprising an illuminating lamp and an illuminating lamp power supply, a 3CCD color camera, and an industrial controller provided with a switching value input card [4], a switching value output card, an RGB three-primary-color video acquisition card and an image processing and color distinguishing software package. The code disc [1] is fixedly connected with a rotating shaft of a sample cup support in the Vierie test thermostat, and is provided with a code groove [1-1] and a code hole [1-2] which have the same number and correspond to the number and position of sample cup holes on the sample cup support, when any sample cup rotates to an observation window which is opposite to the Vierie test thermostat along with the sample cup support, the first photoelectric converter [2] acts through the corresponding code groove [1-1] and provides a high level signal for the switching value input card [4], and when the sample cup support hole which is provided with a temperature measurement platinum resistor is converted to the observation window, the first photoelectric converter [2] and the second photoelectric converter [ 3] act through the corresponding code groove [1-1] and the code hole [1-2] respectively and provide a high level signal for the switching value input card [4 ]; the lighting assembly and the 3CCD color camera are arranged right opposite to an observation window of the Vieri test thermostat, and a lighting lamp power supply and a camera power supply of the lighting assembly and the 3CCD color camera are respectively connected with a first solid-state relay and a second solid-state relay on the switching value output card; the image processing and color distinguishing software comprises a color mark database, a test result database, a parameter setting module, a power supply control module, a display module, a sample cup synchronous signal processing module, an image capturing module and a color identifying module: the color marking database stores the ratio of red to blue corresponding to six color grades of dozens of different sample types; the test result database stores test paper color data and identification results collected at various times; the parameter setting module is used for setting the drug type parameters of the samples placed in the sample cups during the test; the power supply control module correspondingly controls the first solid-state relay and the second solid-state relay to switch on or off the power supply of the lighting lamp and the power supply of the camera at the beginning or the end of a test period; the display module collects the video output of the 3CCD color camera through a three-primary-color video capture card, the on-site dynamic image of the test paper of the sample cup is always displayed through a display screen in a test period, and the color mark of the test paper in each sample cup is displayed after the test period is finished; the function of the sample cup synchronous signal processing module is to call the image capturing module when the switching value input card [4] is inquired to have a switching value signal, judge whether the sample cup which is over against the observation window is a sample cup with test paper or not according to the path number of the switching value signal, and call the color identification module if the sample cup is judged to be the sample cup with test paper; the image capturing module captures a still image of a frame of sample cup test paper through an RGB (red, green and blue) tricolor video capture card and stores the still image into a frame buffer area; the color identification module has the functions of selecting a current frame of static image in a frame buffer area, intercepting a fixed rectangular area with a test paper overlapped part image, solving the respective average value of RGB three primary colors of all pixels in the fixed rectangular area, then solving the ratio of the red average value to the blue average value, comparing the ratio with the six grades of reference data of the corresponding test paper color of a sample in the color marking database, determining the color marking of the test paper in the current sample cup at the moment, and storing the judgment result in the test result database in a list form.
2. The Vieri test strip color-identifying device of claim 1, wherein: the size of the on-site dynamic image of the sample cup test paper is 192 multiplied by 144 pixels; the fixed rectangular area is 44 × 64 pixels.
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| US5642189A (en) * | 1995-06-12 | 1997-06-24 | Measurex Corporation | Color sensor simulating standard source illuminant |
| WO2002086430A2 (en) * | 2001-04-24 | 2002-10-31 | Color Quest Limited | Color comparison method and apparatus |
| DE10156804B4 (en) * | 2001-11-20 | 2011-03-17 | Quidel Corp., San Diego | Optical measuring device for test strips |
| CN1811358A (en) * | 2005-01-28 | 2006-08-02 | 北京机械工业学院 | Control method for measuring colour difference |
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