CN114427911A - Color recognition device and method thereof - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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Abstract
The invention discloses a color recognition device and a method thereof, wherein the color recognition device comprises a shell, a circuit board, a mirror base, a sensor and a light source, wherein the circuit board is positioned on the upper side of the shell and forms a measurement cavity with the shell; the lens base and the circuit board form an accommodating cavity, and the sensor is arranged in the accommodating cavity; the lens base is provided with a light through hole which is communicated with the accommodating cavity; the bottom surface of the shell is provided with a measuring hole, the light through hole and the measuring hole form a reflected light path channel, and the sensor is positioned on the reflected light path channel. The invention is suitable for measuring the color of an article with a flat surface, and has the advantages of simple structure, small stray light error and accurate measurement.
Description
Technical Field
The invention belongs to the technical field of color measurement, and particularly relates to a measuring device and a method for effectively detecting the color of an object to be measured with a flat surface to be measured, which have a simple structure.
Background
The object surface color detecting instrument is widely applied to various industries and fields, such as textile, electronic products, paint, printing, paper manufacturing industries, camera detection and photographic color management fields; the demand of the detection of the surface color of an object in daily production and life is increasing, and the application of detection equipment is also wider and wider.
The detection of the color of the surface of an object has been known for decades. The method mainly comprises the steps of irradiating an object by using a standard light source, and converting reflected light into a measurement result through a sensor. International Lighting Association communication ILLUMINATION, proposed four color measurement principles of 45/0, 0/45, 0/dispersion and dispersion/0. In these X/Y measurement principles, X represents an angle between incident light and a normal line of a plane where a point to be measured is located (hereinafter referred to as an "incident angle"), and Y represents an angle between a normal line of a plane where a point to be measured is located (hereinafter referred to as a "reflection angle"), that is: the 45/0 measurement method refers to an incident angle of 45 degrees and a receiver reflection angle of 0 degree; 0/45 incident angle 0 degrees, receiver reflection angle 45; the 0/dispersion angle of incidence is 0 degrees and the receiver receives diffuse light. The diffuse/0 incident light diffuses the light and the receiver reflects an angle of 0 degrees.
Due to economy, the 45/0 measurement mode is widely applied, and more than three point light sources are placed on a conical surface with an included angle of 45 degrees with the normal of the surface of a sample, so that the 45/0 measurement mode can be met. However, the current 45/0 measurement mode has some measurement defects.
The color measuring device and the color measuring method which are disclosed at present have the disadvantages of large structure, inconvenient carrying and application; due to the stray light entering the sensor, the stray light error is large, the error calculation amount is large, the color measurement accuracy is low, and the like.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a color detection device and method, aiming at the above deficiencies in the prior art, the color detection device has the advantages of simple structure, reasonable design, easy implementation, high sensitivity, small stray light error, small calculated amount of the color detection method, high precision, and obvious effect especially when detecting an object with a flat surface to be detected.
In order to solve the technical problems, the invention adopts the technical scheme that:
1) a color recognition device is characterized by comprising a shell, a circuit board, a mirror base, a sensor and a light source; wherein: the circuit board is positioned on the upper side in the shell and forms a measuring cavity with the shell;
the lens base and the circuit board form an accommodating cavity, and the sensor is arranged in the accommodating cavity;
the lens base is provided with a light through hole which is communicated with the accommodating cavity;
the bottom surface of the shell is provided with a measuring hole, the light through hole and the measuring hole form a reflected light path channel, and the sensor is positioned on the reflected light path channel.
2) The color recognition device according to claim 1), wherein the sensor is preferably a multispectral sensor.
3) The color identification device according to claim 2), wherein the spectral range of the multispectral sensor is visible light and near-infrared light.
4) The color recognition device according to claims 1) -3), wherein the light source is disposed on the circuit board obliquely above the measurement hole.
5) The color recognition device according to claims 1) -4), wherein the light sources are distributed in a ring or a point ring.
6) Color recognition device as claimed in claims 4) to 5), characterized in that the incident light of the light source is angled with respect to the bottom surface of the housing when passing through the measuring aperture.
7) The color recognition apparatus of claim 6), wherein the incident light of the light source is at an angle of 45 degrees to the bottom surface of the housing when passing through the measurement aperture.
8) Color recognition arrangement according to claims 1) -7), characterized in that the light sources are LEDs.
9) Color recognition arrangement according to claims 1) -8), characterized in that the sensor is electrically connected to a circuit board.
10) The color recognition device as claimed in claims 1) -9), wherein the opening of the light-passing hole adjacent to one side of the accommodating cavity is smaller than the opening of the other side.
11) The color recognition device according to claims 1) -10), wherein the sensor has the same central axis as the light passing hole and the measurement hole.
12) The color recognition apparatus of claim 11), wherein the measurement hole is provided at a central position of a bottom surface of the housing.
13) A color recognition method applied to the color recognition apparatus according to claims 1) to 12), the color recognition method comprising the steps of:
s1, the sensor collects data of a measured object; (ii) a
S2, performing color gamut calculation according to the collected data;
s3, calculating the color difference according to the collected data and the value obtained by the color gamut calculation.
14) The color identification method according to claim 13), characterized in that the S01 color data calibration and the S02 color chart calibration are performed before the step S1.
15) The color identification method according to claim 14), wherein when the sensor is a multispectral sensor, the S01 color data calibration comprises the following steps:
s011, measuring a standard multicolor color chart by adopting standard spectrum measuring equipment to obtain standard spectrum data;
s012, according to the order of measuring the standard multicolor cards by the standard spectrum measuring equipment, measuring the standard multicolor cards by the color identification device to obtain the multispectral sensor data;
and S013 fitting and calibrating the standard spectrum data and the spectrum sensor data.
16) The color recognition method according to claim 15), wherein the method of acquiring the standard spectral data in step S011 is: the standard spectral measurement device is driven into the color identification device such that the standard spectral measurement device is in an approximate environment with the multispectral sensor of the color identification device.
Compared with the prior art, the invention has the following advantages:
1. the invention is composed of a shell, a circuit board, a light source, a lens seat and a sensor which are arranged in a measuring cavity formed by the shell and the circuit board, wherein the sensor is electrically connected with the circuit board, thereby facilitating various subsequent electrical operations, and the invention has simple structure, reasonable design and easy realization.
2. The sensor is arranged in the accommodating cavity formed by the lens base and the circuit board, so that a light source can not directly enter the sensor basically, stray light errors are small, and the measurement precision is high.
3. The bottom of the lens base is provided with the light through hole, so that incident light of the light source penetrates through the measuring hole, forms a certain included angle and irradiates on a sample to be measured, reflected light reflected by the sample to be measured smoothly reaches the sensor through the reflected light path, stray light indirectly generated by the light source cannot be emitted into the sensor basically, stray light error is small, and measuring precision is high.
4. The multispectral sensor is adopted, so that the color measurement accuracy is higher, and meanwhile, the multispectral sensor can be used for measuring the spectral information and the material information of the object to be measured, and the further development of the functions of the color measurement device is facilitated.
5. The color measuring device has the advantages of good use effect and strong practicability, and is convenient for popularization and use in color measurement of an object to be measured with a relatively flat surface to be measured.
In conclusion, the invention has the advantages of simple structure, reasonable design, easy realization, high detection sensitivity, high precision, strong practicability and long service life, and solves the error generated when the sensor is directly exposed to a light source in the prior art.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic structural diagram of a color measurement device according to an embodiment of the present invention.
Description of reference numerals:
1-a circuit board; 2-a sensor; 3-light through hole;
4-a lens base; 5-a light source; 6-measuring the hole;
7-the substance to be detected; 8-shell.
Fig. 2-3 are flow charts of color measurement methods according to an embodiment of the present invention.
Fig. 4 is a flowchart of a color data calibration method according to an embodiment of the present invention.
Detailed Description
The terms and words used in the following specification and claims are not limited to the literal meanings, but are used only by the inventors to enable a clear and consistent understanding of the application. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present application are provided for illustration only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
While ordinal numbers such as "first," "second," etc., will be used to describe various components, those components are not limited herein. The term is used only to distinguish one element from another. For example, a first component could be termed a second component, and, similarly, a second component could be termed a first component, without departing from the teachings of the inventive concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.
The color measuring device is shown in figure 1, and the color measuring device comprises a shell 8, a circuit board 1, a lens base 4, a sensor 2 and a light source 5; wherein: the circuit board 1 is positioned on the upper side of the shell 8 and forms a measuring cavity with the shell 8; the lens base 4 and the circuit board 1 form an accommodating cavity, and the sensor 2 is arranged in the accommodating cavity; the lens base 4 is provided with a light through hole 3, and the light through hole 3 is communicated with the accommodating cavity; the bottom surface of the shell 8 is provided with a measuring hole 6, the light through hole 3 and the measuring hole 6 form a reflected light path channel, and the sensor 2 is positioned on the reflected light path channel. The direction of the reflected light path is the same as the normal direction of the sample to be measured.
More specifically, in the embodiment of the present application, the light source 5 is disposed on the circuit board 1 obliquely above the measurement hole 6, wherein an incident light of the light source 5 forms an angle with the bottom surface of the housing 8 when passing through the measurement hole 6. When a sample to be measured is placed below the color measuring device, the measuring hole 6 is aligned with a point to be measured on the sample to be measured, the incident light of the light source 5 passes through the measuring hole 6 and irradiates the sample to be measured at a certain included angle, and the reflected light reflected by the sample to be measured passes through the reflected light path and then reaches the sensor 2.
More specifically, as shown in fig. 1, in the embodiment of the present application, the lens holder 4 and the circuit board 1 form an accommodating cavity, and the sensor 2 is disposed in the accommodating cavity, so that the sensor 2 and the light source 5 form a barrier and are not directly exposed under the light source 5, and then light generated by the light source 5 cannot directly enter the sensor, stray light of the light entering the sensor 2 is reduced, color measurement errors are reduced, and measurement accuracy is improved.
More specifically, as shown in fig. 1, in the embodiment of the present application, the lens holder 4 is provided with a light through hole 3, so that incident light of the light source 5 passes through the measuring hole 6 and irradiates on the sample to be measured at a certain included angle, and then reflected light reflected by the sample to be measured smoothly passes through the reflected light path to reach the sensor 2, and meanwhile stray light generated by the light source 5 cannot directly or indirectly enter the sensor 2, so that a color measurement error is reduced, and measurement accuracy is improved.
More specifically, as shown in fig. 1, in the embodiment of the present application, the sensor has the same central axis as the light passing hole and the measurement hole. The reflected light path channel is more favorable for the reflected light to enter the sensor 2, and meanwhile stray light is reduced from entering.
Preferably, the opening of the light through hole 3 close to one side of the accommodating cavity is smaller than the opening of the other side, so that the wall of the accommodating cavity is at a certain oblique angle, and stray light can be better prevented from being emitted.
More specifically, in the embodiment of the present application, the sensor 2 is disposed in the accommodating cavity of the mirror base 4 and the circuit board 1, and is configured to receive the reflected light, and further, the sensor is electrically connected to the circuit board. Preferably, the sensor 2 is a multispectral sensor, the spectral range of the multispectral sensor is visible light and near infrared band, and further, the wavelength range is 350-1000 nm. The multispectral sensor carries out color identification and measurement by collecting the spectral information of the object to be measured, so that the color identification device has high measurement sensitivity and high measurement precision. The spectral information collected at the same time can be used for judging the material of an object, so that the color recognition device provided by the invention can be further expanded in function according to actual requirements, and can be applied to more fields.
Preferably, as shown in fig. 1, the light source 5 is disposed on the circuit board 1 obliquely above the measurement hole 6.
Preferably, as shown in fig. 1, the incident light of the light source 5 passes through the measurement hole 6 and forms an angle with the bottom surface of the housing 8. Further, the incident light of the light source 5 passes through the measuring hole 6 and irradiates on the sample to be measured at an included angle of 45 degrees.
Preferably, the light sources 5 are distributed in a ring or a point ring.
Preferably, the light source 5 is an LED.
Color measuring method
The present invention further includes a color measurement method, as shown in fig. 2, in an embodiment of the present application, the color identification method includes the following steps:
s1, the sensor 2 collects data of a measured object; (ii) a
S2, performing color gamut calculation according to the collected data;
s3, calculating the color difference according to the collected data and the value obtained by the color gamut calculation.
As shown in fig. 3, in an embodiment of the present application, further, the color identification method further includes the following calibration steps:
s01 color data calibration and S02 color card calibration.
More specifically, as shown in fig. 4, in an embodiment of the present application, the sensor 2 is implemented as a multispectral sensor, and the S01 color data calibration includes the following steps:
s011, measuring a standard multicolor color chart by adopting standard spectrum measuring equipment to obtain standard spectrum data;
s012, according to the order of measuring the standard multicolor cards by the standard spectrum measuring equipment, measuring the standard multicolor cards by the color identification device to obtain the multispectral sensor data;
and S013 fitting and calibrating the standard spectrum data and the spectrum sensor data.
Further, the method for acquiring the standard spectrum data in step S011 includes: the standard spectral measurement device is driven into the color identification device such that the standard spectral measurement device is in an approximate environment with the multispectral sensor of the color identification device. Specifically, after the standard spectrum measuring device goes deep into the color identification device, the light source 5 is turned on, the standard spectrum measuring device measures the standard multicolor chart, and obtains XYZ values of standard spectrum data of each color on the standard multicolor chart, and when the standard multicolor chart is implemented as an N (where N is the number of colors of the color chart), the XYZ values of the N standard spectrum data form a 3 × N standard spectrum data matrix T.
Further, the method for acquiring the multispectral sensor data in step S012 includes: taking multispectral sensors with 10 channels (the front 8 channels correspond to visible light, the back 2 channels are transparent channels and flicker channels, and the back 2 channels are not involved in calculation) as an example, firstly, placing the color identification device on an N-color card, and sequentially collecting the multispectral sensor 8 channel data of each color according to the sequence of measuring the standard N-color card by the standard spectrum measuring equipment; secondly, calculating the RawSensorValue of the multi-spectral sensor 8 channel data according to the Gain and the Integration Time set by the multi-spectral sensor to obtain a final 8 XN multi-spectral sensor data matrix S, wherein the calculation formula is as follows:
when the color measuring device according to the prior art performs measurement, it still needs to collect the offset matrix offset of the sensor under dark environmental conditions, so as to perform matrix offset correction on the multispectral sensor data matrix S as a necessary parameter when performing fitting calibration in step S13. The offset value is generally generated by light rays directly emitted into the sensor by the light source, and the structure design of the color identification device ensures that the light rays of the light source cannot be directly emitted into the sensor basically, so that matrix values of the offset values are all 0, the matrix offset value is not required to be corrected in the step S013, the calculated amount of the S01 color data calibration method is reduced, and the color identification accuracy is improved.
Further, the method for performing the fitting calibration in step S013 is: a fitting method is selected, and in one embodiment of the invention, the method used is a least squares fit. The specific fitting method comprises the following steps:
setting a conversion matrix from the data matrix S of the 8-channel multispectral sensor to the standard spectral data matrix T as CXYZThe method comprises the following steps:
CXYZS＝T
the least square method can be used for obtaining:
CXYZSST＝TST
CXYZ＝(SST)-1TST
wherein S isTIs the transpose of S.
From this, a conversion matrix C is obtainedXYZAnd calculating in the steps S2 and S3, and finally realizing the color measurement of the object to be measured.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (16)
1. A color recognition device is characterized by comprising a shell, a circuit board, a mirror base, a sensor and a light source; wherein:
the circuit board is positioned on the upper side in the shell and forms a measuring cavity with the shell;
the lens base and the circuit board form an accommodating cavity, and the sensor is arranged in the accommodating cavity;
the lens base is provided with a light through hole which is communicated with the accommodating cavity;
the bottom surface of the shell is provided with a measuring hole, the light through hole and the measuring hole form a reflected light path channel, and the sensor is positioned on the reflected light path channel.
2. The color identification device according to claim 1, wherein the sensor is preferably a multispectral sensor.
3. The color identification device according to claim 2, wherein the spectral range of the multispectral sensor is visible light and near-infrared light.
4. The color recognition apparatus of claims 1-3, wherein the light source is disposed on the circuit board obliquely above the measurement hole.
5. The color recognition device according to claims 1-4, wherein the light sources are distributed in a ring or a point ring.
6. Color recognition arrangement according to one of claims 4 to 5, characterized in that the light rays incident from the light source are directed through the measuring aperture at an angle to the bottom surface of the housing.
7. The color identifying device of claim 6 wherein the incident light from the light source passes through the measuring aperture at an angle of 45 degrees to the bottom surface of the housing.
8. The color recognition device of claims 1-7, wherein the light source is an LED.
9. The color recognition device of claims 1-8, wherein the sensor is electrically connected to a circuit board.
10. The color recognition device as claimed in claims 1 to 9, wherein the opening of the light passing hole adjacent to one side of the accommodating cavity is smaller than the opening of the other side.
11. The color recognition device of claims 1-10, wherein the sensor has the same central axis as the light passing hole and the measurement hole.
12. The color identifying device of claim 11 wherein the measuring hole is formed at a center of a bottom surface of the housing.
13. A color recognition method applied to the color recognition apparatus according to claims 1-12, the method comprising the steps of:
s1, the sensor collects data of a measured object;
s2, performing color gamut calculation according to the collected data;
s3, calculating the color difference according to the collected data and the value obtained by the color gamut calculation.
14. The color identification method according to claim 13, wherein S01 color data calibration and S02 color chart calibration are performed before the step S1.
15. The color identification method according to claim 14, wherein when the sensor is a multispectral sensor, the S01 color data calibration comprises the steps of:
s011, measuring a standard multicolor color chart by adopting standard spectrum measuring equipment to obtain standard spectrum data;
s012, according to the order of measuring the standard multicolor cards by the standard spectrum measuring equipment, measuring the standard multicolor cards by the color identification device to obtain the multispectral sensor data;
and S013 fitting and calibrating the standard spectral data and the multispectral sensor data.
16. The color recognition method according to claim 15, wherein the step S011 of acquiring the standard spectral data comprises: the standard spectral measurement device is driven into the color identification device such that the standard spectral measurement device is in an approximate environment with the multispectral sensor of the color identification device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115493698A (en) * | 2022-11-18 | 2022-12-20 | 深圳市华众自动化工程有限公司 | RGB-based color recognition sensor |
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| CN102494775A (en) * | 2011-12-06 | 2012-06-13 | 北京新岸线数字图像技术有限公司 | Multi-angle color collection device and detection equipment of color variable ink |
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Effective date of registration: 20230413 Address after: Room 3211, 3rd Floor, Building 3, No. 830 Wenyi West Road, Xihu District, Hangzhou City, Zhejiang Province, 310000 Applicant after: Hangzhou View Zhilian Technology Co.,Ltd. Address before: 312000 room 701, building 12, Chunxiao garden, Bailu Jintan, Tianhe community, lingzhi Town, Yuecheng District, Shaoxing City, Zhejiang Province Applicant before: Chen Yuxin |