CN204373781U - A kind of light beam laser paper color and light beam quality automatic checkout system - Google Patents

Abstract

The utility model relates to an automatic detection system for the color of light column laser paper and the quality of light column. The system is mainly composed of a positioning sensor, a color measuring instrument, a control execution device, a measurement platform and a computer. The color measurement instrument is arranged above the measurement platform, and the color measurement instrument is connected with the control execution device. The computer is connected; the positioning sensor is arranged on the top of the color measuring instrument, and is respectively connected with the color measuring device and the computer. The utility model solves the problems of measurement value uncertainty and human error, realizes automatic measurement, has convenient and fast operation, standard measurement and small error.

Description

An automatic detection system for light column laser paper color and light column quality

technical field

The utility model relates to an automatic detection system for the color and quality of light column laser paper, which is used to automatically detect and evaluate the color and quality of light column laser paper. The position of the measuring instrument and the paper to be tested can be fixed by building a special laser paper measurement platform , to ensure the stability of the measurement conditions and the reliability of the results. Through the detection equipment and control module, the displacement of the color measuring instrument and the position of the measuring point can be controlled, the color of the laser beam paper and the quality of the beam can be calculated and judged, and the period of the beam of the beam laser paper can be identified, so as to realize the automatic detection and monitoring of the color of the beam laser paper and the quality of the beam evaluate.

Background technique

Light column laser paper is a commonly used printing material for packaging and printing, which can significantly improve the appearance of packaging products. However, due to the diffracted light generated on the surface of the light column laser paper, iridescence is formed, resulting in different measurement results at different positions of the sample or in different directions of the instrument when measuring the color. At the same time, unqualified light beam laser paper will also cause color measurement errors due to reasons such as light beam tilt and uneven surface treatment. Obviously, the use of ordinary printed matter color measurement methods will lead to large measurement errors and uncertainties. The newly proposed method of detecting the color of light column laser paper also needs to be carried out on the basis of determining the direction of the light column and the vertical direction of the light column of the laser paper, resulting in measurement The process is cumbersome and time-consuming. At present, there is no mature method for quickly measuring and evaluating the color of the beam laser paper and the quality of the beam.

Contents of the invention

The purpose of this utility model is to solve the problems of uncertain measurement results and easy human errors caused by manual measurement of laser paper, and at the same time avoid the need to determine the beam direction and vertical direction of laser paper before measuring the color of laser paper. Based on the chromaticity values at different positions in the horizontal and vertical directions of the paper, an automatic detection and evaluation system for the color of the laser beam paper and the quality of the beam beam is proposed to realize the automatic measurement of the color of the laser paper and the quality of the beam beam.

In order to improve the accuracy and efficiency of color measurement and avoid operational uncertainty and human error caused by manual measurement, the utility model proposes a general test platform for light column laser paper color measurement and light column quality detection, which is used for testing in the field of printing and packaging. Laser paper color and beam quality provides a measuring device for accurate and rapid measurement of beam laser paper color and beam quality. This system is suitable for automatic color measurement of light column laser paper and printed matter using light column laser paper as printing material, color difference tolerance evaluation and light column quality inspection.

To achieve the above object, the utility model takes the following technical solutions:

An automatic detection system for light column laser paper color and light column quality, the system is mainly composed of a positioning sensor, a color measuring instrument, a control execution device, a measuring platform, a computer, etc., the color measuring instrument is set above the measuring platform, and the The color measurement instrument is connected to the control execution device, and the color measurement instrument and the control execution device are respectively connected to the computer; the positioning sensor is arranged above the color measurement instrument, and is respectively connected to the color measurement device and the computer.

The computer includes a control module, a sensor signal processing module, an image analysis module, a data analysis module, etc.; the control execution device of the color measuring instrument is electrically connected with the control module of the computer through an interface circuit, and the control execution device drives the color measurement instrument Carry out horizontal (surface) displacement (the relative vertical position between the color measuring instrument and the sample is fixed); the described positioning sensor is electrically connected with the sensor signal processing module, and the described color measuring instrument is connected with the image analysis module and the data analysis module electrical connection.

The color measuring instrument is a diffuse reflectance spectrophotometer, and correspondingly, the color measuring instrument control execution device is a spectrophotometer control execution device.

The color measuring instrument can be an integrating sphere spectrophotometer, the measurement condition is a D65 light source, the illumination and observation geometrical conditions are d/8 (diffuse reflection illumination, 8° angle of view detection from the normal direction), CIE1964 standard observer , SCI (including specular reflection).

The method for automatically detecting and evaluating the color of light column laser paper and the quality of light column by using the above detection system includes the following steps:

(1) Using the above-mentioned automatic detection system, place and fix the light column laser paper to be measured on the measurement platform;

(2) set the color measurement instrument in the control module of the computer on the measurement platform in the horizontal direction and the vertical direction of the number of measurement points n and the measurement step size d;

(3) Automatically control the displacement, positioning and measurement of the color measuring instrument in the horizontal and vertical directions by the computer, and read the color information of the measured sample at different positions;

(4) The data analysis module of the computer analyzes and calculates the color and chromaticity values of the beam laser paper in the horizontal and vertical directions measured by the instrument, selects the reference value, and compares the CIELAB (or CIEDE2000) obtained at different measurement positions of the tested sample color difference value;

(5) Draw the color difference distribution diagram at different positions. From the periodic distribution of color difference and the peak distribution law, the color uniformity and light beam quality of a single beam of laser paper can be detected, that is, whether the beam of light is inclined, whether the surface treatment of the laser paper is uniform, At the same time, the rainbow period of the light column laser paper can also be obtained.

Further, compare the peak value of the color difference distribution curve in step (5) with the set color difference tolerance value to judge whether the color of the light beam laser paper base is qualified or not; or compare the data of the test sample and the standard sample to give the sample qualified judgment of whether or not.

In step (2), the color measuring instrument can move along the test platform in the X horizontal direction and the Y vertical direction, and the number of measuring points n and the displacement of the set color measuring instrument in the X and Y directions can be input on the computer software operation interface The step size d, (n-1)×d is smaller than the effective measurement range of the measurement platform.

In step (3), the computer automatically controls the color measuring instrument to perform measurement according to the parameters set in step (2), and reads the chromaticity value of the color of the beam laser paper sample.

In step (4), take the color chromaticity value of the starting point as a reference value, calculate the CIELAB (or CIEDE2000) color difference value compared with it at different measurement positions; or take the average of the color chromaticity values at all different positions in the horizontal X direction Value is the reference value, calculate the CIELAB (or CIEDE2000) color difference value of each measurement point compared with the average value; The CIELAB (or CIEDE2000) color difference value calculated and compared with this point.

The computer data analysis module calculates the CIELAB (or CIEDE2000) color difference value between sampling points at different locations, compares it with the color difference tolerance value given by the laser paper manufacturer or printing and packaging manufacturer, and judges whether the color of the beam laser paper is qualified or not. Or compare the data of the test sample and the standard sample, and give a judgment on whether the sample is qualified or not.

In step (5), it is necessary to uniformly collect color chromaticity information at different positions along the horizontal and vertical directions on a piece of light column laser paper, select a reference value, and obtain CIELAB (or CIEDE2000) color difference values at different measurement positions of the tested sample; Draw the chromatic aberration distribution diagram, and detect the quality of the light column of the light column laser paper, whether the light column is inclined, and whether the surface treatment is uniform through the periodic distribution of the color difference distribution line diagram.

The utility model sends instructions to measure in the horizontal direction and the vertical direction through the computer control module, uniformly collects the chromaticity value in the vertical light column direction through the spectrophotometer, compares the size of the color difference with the initial position, draws a broken line diagram of the color difference distribution, and analyzes the data by the computer. Calculate the light column period of the light column laser paper. The color of the laser paper is evaluated by the peak value of the color difference distribution line graph, and the color uniformity and light column quality of the light beam laser paper are evaluated by the periodic distribution of the color difference distribution line graph.

The utility model is a device for detecting the color of the light column laser paper and the quality of the light column. A spectrophotometer is arranged on the measurement platform, and a positioning sensor is arranged above the spectrophotometer; Spectrophotometer; the sensor signal processing module of the computer is electrically connected with the positioning sensor, and the data analysis module of the computer is electrically connected with the spectrophotometer. The detection method includes: 1) determining the displacement step size and the number of measuring points; 2) sampling at different positions in the X (horizontal) and Y (vertical) directions of the paper, and reading the measured values; 3) calculating the difference between different measuring points in the vertical direction and the starting point 4) Evaluate the quality of the light column through the color difference distribution diagram, and calculate the light column period.

Compared with the prior art, the beneficial effect of the utility model is: through the detection device of the laser paper color, the position of the measuring instrument and the paper to be tested can be fixed to ensure the stability of the measurement condition and the reliability of the result; the setting of the color measuring instrument The displacement and the position of the measuring point, the color measuring instrument automatically measures and calculates the CIELAB (or CIEDE2000) color difference value between different sampling points, and judges whether the color of the light column laser paper sample and the quality of the light column are qualified or not. This system can solve the measurement value uncertainty and human error caused by manual measurement of laser paper samples, and at the same time avoid different cutting methods when cutting laser paper, resulting in inconsistent distribution of light beams, and it is difficult to measure the color of laser paper. When unifying the direction of the beam of light and the direction of the vertical beam of light, the automatic measurement of the color of the laser paper can be realized. It is easy to operate, simple and fast, and the measurement is standardized and the error is small.

The color measuring instrument of the utility model automatically measures and calculates the color difference value between different sampling points, which can be compared with the existing color difference tolerance value in the data analysis module to judge the color and the quality of the light column laser paper sample.

The utility model will be further described below through the accompanying drawings and specific embodiments, but it does not mean that the protection scope of the utility model is limited.

Description of drawings

Figure 1 is a schematic diagram of the structure of the automatic measurement system for the color of the light column laser paper.

Fig. 2 is a schematic diagram of different measuring positions of the color measuring instrument on the laser paper.

Fig. 3 is a calculated broken-line diagram of the color difference distribution at different positions in the vertical direction and the initial position of the two kinds of laser paper.

Fig. 4-1 and Fig. 4-2 are the line graphs of the color difference distribution at different positions in the vertical direction and at the starting position obtained by calculating the first and second types of laser paper tilted at a certain angle, respectively.

Figure 5-1 and Figure 5-2 are the grayscale images of the two types of light column laser paper base scanned by the scanner, and the light column period can be judged by measuring the distance between the black stripes.

Detailed ways

The utility model can automatically detect and evaluate the color of the light column laser paper and the quality of the light column. First of all, it is necessary to determine the sampling and displacement of the color measuring instrument at different measuring positions. The measurement system of the utility model can accurately control the position of the measuring point of the color measuring instrument on the light column laser paper sample, so that the color measuring instrument can follow a certain step along the X and Y directions respectively. Long-term measurement, automatically measure the color value of each point, and calculate the CIELAB (or CIEDE2000) color difference value between different sampling points, so as to obtain the uniformity of the color of the single laser paper sample and the quality of the light column, and compare the measured value with the color of the standard sample By comparison, a quality judgment of the sample can be obtained.

Below in conjunction with accompanying drawing embodiment, the utility model is described further:

As shown in Figure 1, the device for automatically detecting the color of light column laser paper and the quality of light column includes a computer, a measurement platform, and a spectrophotometer is arranged on the measurement platform; a positioning sensor is arranged above the spectrophotometer; the computer includes a control module, a sensor signal processing module, The image analysis module and the data analysis module; the control module is electrically connected to the spectrophotometer control execution device through the interface circuit, and the spectrophotometer control execution device is connected to the spectrophotometer; the sensor signal processing module is electrically connected to the positioning sensor, and the positioning sensor is connected to the spectrophotometer connected, the spectrophotometer is electrically connected with the image analysis module and the data analysis module. The control actuator can drive the spectrophotometer to move horizontally, and the relative vertical position between the spectrophotometer and the sample is fixed.

Take X-Rite SP64 integrating sphere spectrophotometer as an example. It should be noted that the utility model is not limited to this series of spectrophotometers, and this method is applicable to different professional grade reflective spectrophotometers.

Automatically detect and evaluate the color of the light column laser paper and the quality of the light column, the specific steps are as follows:

(1) Fix the spectrophotometer and light column laser paper sample on a special measurement platform, as shown in Figure 1, the measurement platform is used to fix the position of the paper to be tested, and the control module in the computer instructs the spectrophotometer to control the execution device through the interface circuit , used to precisely control the displacement of the spectrophotometer in the X and Y directions respectively.

The positioning sensor is used to accurately detect the sampling position of the spectrophotometer on the paper to be tested, and send the coordinate position of the sampling point to the sensor signal processing module.

(2) Input the displacement step length and the number of sampling points of the spectrophotometer in the horizontal X direction and the vertical Y direction on the software operation interface of the computer data analysis module (just smaller than the effective measurement format size of the measurement platform), and the sampling size is measured within the effective measurement range of the platform. If it is necessary to test the color uniformity and beam quality of laser paper, it is generally recommended to sample as much as possible uniformly in the XY direction of the paper as needed.

(3) The spectrophotometer is precisely controlled by the spectrophotometer control executive device, and the displacement steps in the X and Y directions are realized to realize the positioning and measurement of the spectrophotometer, and to read the color values of different measurement positions of the laser paper sample.

(4) The computer data analysis module calculates and compares the CIELAB (or CIEDE2000) color difference values between the different measurement positions of the light column laser paper samples, as shown in Figure 2. The Y direction shown by the solid line of the light column laser paper vertical measurement platform is respectively every The interval is 2.5mm, and the X direction is measured at intervals of 2.5mm. Measure the chromaticity value of 65 points in total, compare the color difference with the starting point CIELAB color difference, draw the color difference distribution map, and detect the color of the beam laser paper through the periodic distribution of color difference. quality and beam quality. The above measurements were carried out on the two kinds of beam laser paper samples, and the color difference distribution diagram was drawn as shown in Figure 3. Compared with the initial position of the first kind of paper, the minimum value of color difference appeared at positions 20, 39 and 58. Compared with the starting position of the second paper, the maximum color difference appears at the positions of 11, 30 and 49. Therefore, it can be calculated that the light column period of the two light column laser papers is 19×2.5mm=4.75cm.

(5) After rotating the first light column laser paper in step (1) at any angle within the range of 0°-180°, fix it on the measurement platform, as shown in Figure 2, along the X direction and Y direction shown by the dotted line For direction measurement, repeat steps (2)-(4), compare the color chromaticity values at different positions in the vertical direction with the initial position, and calculate the measurement points of the laser paper at the solid line position and the dotted line position after rotation chromatic aberration, draw a line graph of the chromatic aberration distribution, as shown in Figure 4-1 and Figure 4-2.

The following steps (4) and (5) are combined to judge whether the color of the beam laser paper and the quality of the beam are qualified or not.

Use a digital camera with a line light source to take or scan the digital image of the light column laser paper sample, as shown in Figure 5-1 and Figure 5-2. By reading the vertical distance between adjacent black lines in the image, it is determined that the light column period C of the light column laser paper sample is 4.8cm. It can be seen from the above verification that the light column period obtained by the method of the utility model is basically the same as that obtained by the conventional method.

From the periodic distribution and peak distribution of color difference in Figure 3, it can be seen that the color of the first beam laser paper has certain differences at different positions on the paper, and the peak value of the third cycle (measurement position 48) is the same as the first The CIELAB color difference value of the peak value of one cycle (measurement position 10) is 1.04, and there are also certain differences in the shape distribution of the line graphs of different cycles, indicating that the surface treatment of the laser paper is not very uniform; the second and third cycles of drawing paper The CIELAB color difference value and the CIELAB color difference value scatter diagram of the first cycle, the linear correlation coefficients are 0.90 and 0.83 respectively. Based on the above analysis, whether the color of the paper and the quality of the light column are qualified or not needs to be judged in combination with the color difference tolerance given by the manufacturer.

The color of the second light column laser paper is at different positions on the paper. The CIELAB color difference of the peaks of the three repetition periods (11, 30, 49 positions) does not exceed 0.1. At the same time, the periodicity of the color difference broken line distribution diagram is good. The scatter diagram of the CIELAB color difference values in the second and third periods and the CIELAB color difference values in the first period, the linear correlation coefficients are 0.99 and 0.97 respectively. It shows that the color quality and beam quality of the paper meet the requirements.

The above step (5) measures a certain inclination angle of the laser paper, just to verify the consistency of the measurement and analysis results with the original measurement results. It can be seen from Figure 4-1 and Figure 4-2 that the light column period of the two kinds of paper, The analysis results of color quality and beam quality are consistent with Fig. 3. In fact, when testing the color of the laser paper and the quality of the light beam, it is only necessary to complete the operations of steps (1)-(4), that is, the direction of the light beam is not limited during the entire measurement process, that is, the direction of the light beam can be consistent with the measurement level same or different direction.

Comparing the peak value of the color difference distribution curve with the set color difference tolerance value can further judge whether the color of the light column laser paper base is qualified or not; or compare the data of the test sample and the standard sample to give a judgment on whether the sample is qualified or not. The light beam laser paper color and light beam quality detection and evaluation system of the utility model can control the spectrophotometer to scan and measure samples in X and Y directions. The measurement platform can fix the light column laser paper sample, and control the color measuring instrument through the control module to measure the color of the light column laser paper sample on the XY plane according to the preset measurement direction and displacement step, and to measure the color of a specific position of the light column laser paper sample. Measurement. Since the measurement position between the instrument and the sample can be accurately controlled, the accuracy and reliability of the measurement are ensured, and the error of human operation is reduced.

The system of the utility model can compare the color measurement value of the sample at different positions with the existing color value and color difference tolerance, and at the same time draw the broken line diagram of the color difference distribution at different positions in the vertical light column direction of the laser paper, detect the quality of the light column, and give a single The color uniformity of the laser paper base, the quality of the light column laser paper light column, and the comparison and judgment of the color consistency between the sample to be tested and the standard sample.

The above is only a preferred embodiment of the utility model, and is not intended to limit the utility model in other forms; any skilled person who is familiar with this profession may use the technical content disclosed above to change or modify it into an equivalent change An equivalent embodiment of . However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present utility model without departing from the content of the technical solution of the utility model still belong to the protection scope of the technical solution of the utility model.

Claims (5)

1. A light beam laser paper color and light beam quality automatic detection system is characterized in that: the system is mainly composed of a positioning sensor, a color measuring instrument, a control execution device, a measuring platform and a computer, and the described color measuring instrument is arranged on the measuring platform above, the color measuring instrument is connected with the control execution device, and the color measurement instrument and the control execution device are respectively connected with the computer; Connect with computer. 2. The automatic detection system for light column laser paper color and light column quality according to claim 1, wherein the computer includes a control module, a sensor signal processing module, an image analysis module and a data analysis module. 3. The light column laser paper color and light column quality automatic detection system according to claim 2, characterized in that: the control execution device is electrically connected with the control module of the computer through the interface circuit, and the control execution device drives the color measuring instrument to perform leveling. displacement. 4. The light column laser paper color and light column quality automatic detection system according to claim 2, characterized in that: the positioning sensor is electrically connected to the sensor signal processing module, and the color measuring instrument is connected to the image analysis module and data analysis module. The modules are electrically connected. 5. The automatic detection system for the color of light column laser paper and the quality of light column according to claim 1, wherein the color measuring instrument is a diffuse reflectance spectrophotometer.