WO2022095321A1 - 亮度色度测量方法、装置、设备及可读存储介质 - Google Patents

亮度色度测量方法、装置、设备及可读存储介质 Download PDF

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WO2022095321A1
WO2022095321A1 PCT/CN2021/081505 CN2021081505W WO2022095321A1 WO 2022095321 A1 WO2022095321 A1 WO 2022095321A1 CN 2021081505 W CN2021081505 W CN 2021081505W WO 2022095321 A1 WO2022095321 A1 WO 2022095321A1
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matrix
chromaticity
luminance
light source
surface light
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PCT/CN2021/081505
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English (en)
French (fr)
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洪志坤
张胜森
欧昌东
郑增强
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武汉精测电子集团股份有限公司
武汉精立电子技术有限公司
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Publication of WO2022095321A1 publication Critical patent/WO2022095321A1/zh

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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
    • G01J3/462—Computing operations in or between colour spaces; Colour management systems
    • 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
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/80—Analysis of captured images to determine intrinsic or extrinsic camera parameters, i.e. camera calibration
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/90—Determination of colour characteristics
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10024—Color image
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30108—Industrial image inspection
    • G06T2207/30121—CRT, LCD or plasma display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30108—Industrial image inspection
    • G06T2207/30124—Fabrics; Textile; Paper

Definitions

  • the present invention relates to the technical field of color measurement, and in particular, to a method, device, device and readable storage medium for measuring luminance and chromaticity.
  • the photometer or colorimeter is divided into point type and imaging type.
  • the point-type brightness or colorimeter needs to measure the product point by point, so as to obtain the brightness of each point of the product or the chromaticity under a certain channel; the imaging-type brightness or colorimeter can measure each product at one time.
  • the luminance of a point or the chrominance of a channel In terms of measurement efficiency, imaging-type luminance or colorimeters are significantly better than spot-type luminance or colorimeters.
  • FIG. 1 is a schematic diagram of a scene in which a sample to be detected is measured by an imaging type luminance or colorimeter in the prior art.
  • the samples to be tested such as display screens, printed and dyed textiles, have different luminescence (viewing angle) characteristics at various angles.
  • the light from point B is collected at a symmetrical angle and enters the optical system of the imaging luminance or colorimeter; while the light from point A enters the optical system obliquely at an angle of field of view, it must be As a result, part of the light is not collected. Therefore, in actual measurement with an imaging-type luminance or colorimeter, the luminance or chromaticity characteristics of different regions and different viewing angles are measured. As a result, the resulting measurements are not accurate.
  • the main purpose of the present invention is to provide a luminance and chromaticity measurement method, device, equipment and readable storage medium, which aims to solve the problem of measuring the luminance and/or chromaticity of a sample to be detected by an imaging-type luminance or colorimeter in the prior art. Measurement, the final measurement result is inaccurate technical problems.
  • the present invention provides a method for measuring luminance and chromaticity, and the method for measuring luminance and chromaticity includes:
  • the step of obtaining a luminance and/or chromaticity calibration matrix by using a camera and a preset surface light source includes:
  • the camera uses the camera to acquire an image of a preset surface light source, and obtain a test luminance matrix and/or a chromaticity matrix of the preset surface light source based on the image of the preset surface light source;
  • the step of obtaining the brightness calibration matrix according to the standard brightness matrix of the preset surface light source and the test brightness matrix of the preset surface light source includes:
  • the step of obtaining the chromaticity calibration matrix according to the standard chromaticity matrix of the preset surface light source and the test chromaticity matrix of the preset surface light source includes:
  • the ratio values of the corresponding elements of the standard chromaticity matrix of the preset surface light source and the test chromaticity matrix of the preset surface light source are acquired, and normalized to obtain a chromaticity calibration matrix.
  • the standard brightness matrix of the preset surface light source is obtained based on the brightness of each point of the preset surface light source measured point by point with a standard single-point luminance meter, and the standard chromaticity matrix of the preset surface light source is based on a standard The chromaticity of each point of the preset surface light source measured point by point with a single-point colorimeter is obtained.
  • the preset surface light source is an integrating sphere uniform light source
  • the standard brightness matrix of the preset surface light source is constructed based on the following steps:
  • the standard chromaticity matrix of the preset surface light source is constructed based on the following steps:
  • the chromaticity value of any point of the integrating sphere uniform light source is obtained by using a standard single-point colorimeter, and a standard luminance matrix of the preset surface light source is constructed based on the chromaticity value.
  • the present invention also provides a luminance and chromaticity measuring device, the luminance and chromaticity measuring device comprising:
  • a building block for obtaining a luminance and/or chromaticity calibration matrix using a camera and a preset surface light source, the lens of the camera being a telecentric lens;
  • an acquisition module configured to use the camera to acquire an image of the sample to be tested, and obtain a test luminance and/or chromaticity matrix of the sample to be tested based on the image of the sample to be tested;
  • a calibration module configured to calibrate the test luminance matrix by using the luminance calibration matrix, and/or use the chromaticity calibration matrix to calibrate the test chromaticity matrix to obtain the actual luminance of the sample to be tested and/or chrominance matrix.
  • the present invention also provides a luminance and chromaticity measurement device, the luminance and chromaticity measurement device comprising a processor, a memory, and a luminance and chromaticity measurement program stored on the memory and executable by the processor , wherein when the luminance and chromaticity measurement program is executed by the processor, the steps of the above-mentioned luminance and chromaticity measurement method are implemented.
  • the present invention also provides a readable storage medium on which a luminance and chromaticity measurement program is stored, wherein when the luminance and chromaticity measurement program is executed by a processor, the above-mentioned luminance is realized The steps of the colorimetric measurement method.
  • a camera and a preset surface light source are used to obtain the luminance and/or chromaticity calibration matrix, and the lens of the camera is a telecentric lens; the camera is used to obtain an image of the sample to be tested, and the image of the sample to be tested is obtained based on the image of the sample to be tested.
  • obtain the test luminance and/or chromaticity matrix of the sample to be tested ; use the luminance calibration matrix to calibrate the test luminance matrix, and/or use the chromaticity calibration matrix to calibrate the test chromaticity matrix Perform calibration to obtain the actual luminance and/or chromaticity matrix of the sample to be tested.
  • the present invention based on the characteristics of the telecentric lens, it is possible to avoid the measurement error caused by the angle of view when measuring the luminance and/or chromaticity of the sample, and to calibrate the luminance and/or chromaticity matrix obtained based on the image. , further improving the accuracy of the final luminance and/or chromaticity measurements.
  • Fig. 1 is the scene schematic diagram that the brightness or colorimeter of imaging type in the prior art measures the sample to be detected
  • FIG. 2 is a schematic diagram of the hardware structure of the luminance and chromaticity measurement equipment involved in the solution of the embodiment of the present invention
  • FIG. 3 is a schematic flowchart of an embodiment of a method for measuring luminance and chromaticity of the present invention
  • FIG. 4 is a schematic diagram of a scene in which a sample to be detected is photographed in an embodiment
  • FIG. 5 is a schematic diagram of functional modules of an embodiment of an apparatus for measuring luminance and chromaticity of the present invention.
  • an embodiment of the present invention provides a luminance and chromaticity measurement device.
  • FIG. 2 is a schematic diagram of the hardware structure of the luminance and chromaticity measurement device involved in the solution of the embodiment of the present invention.
  • the luminance and chromaticity measurement device may include a processor 1001 (for example, a central processing unit, Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005.
  • the communication bus 1002 is used to realize the connection and communication between these components;
  • the user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard);
  • the network interface 1004 may optionally include a standard wired interface, a wireless interface (such as wireless fidelity WIreless-FIdelity, WI-FI interface);
  • the memory 1005 can be a high-speed random access memory (random access memory, RAM), or can be a stable memory (non-volatile memory), such as disk memory, memory
  • 1005 may also be a storage device independent of the aforementioned processor 1001 .
  • the hardware structure shown in FIG. 2 does not constitute a limitation of the present invention, and may include more or less components than those shown in the figure, or combine some components, or arrange different components.
  • the memory 1005 as a computer storage medium in FIG. 2 may include an operating system, a network communication module, a user interface module, and a luminance and chromaticity measurement program.
  • the processor 1001 may call the luminance and chromaticity measurement program stored in the memory 1005, and execute the luminance and chromaticity measurement method provided by the embodiment of the present invention.
  • an embodiment of the present invention provides a method for measuring luminance and chromaticity.
  • FIG. 3 is a schematic flowchart of an embodiment of a method for measuring luminance and chromaticity of the present invention.
  • the luminance and chromaticity measurement methods include:
  • Step S10 using a camera and a preset surface light source to obtain a luminance and/or chromaticity calibration matrix, and the lens of the camera is a telecentric lens;
  • a camera is used to photograph the preset surface light source to obtain an image of the preset surface light source, and then the luminance value and/or chromaticity value of each point on the image of the preset surface light source is extracted to obtain the image of the preset surface light source. Test the luminance and/or chrominance matrix. Then, a brightness calibration matrix is obtained according to the standard brightness matrix of the preset surface light source and the test brightness matrix of the preset surface light source, and/or obtained according to the standard chromaticity matrix of the preset surface light source and the test chromaticity matrix of the preset surface light source Chroma calibration matrix.
  • Step S20 using the camera to obtain an image of the sample to be tested, and based on the image of the sample to be tested, obtain a test luminance and/or chromaticity matrix of the sample to be tested;
  • the sample to be tested may be a display screen or a printed and dyed textile.
  • the sample to be tested is photographed by a camera to obtain an image of the sample to be tested, wherein the lens of the camera is a telecentric lens.
  • FIG. 4 is a schematic diagram of a scene in which a sample to be detected is photographed in an embodiment.
  • the telecentric imaging lens in Figure 4 is a telecentric lens. Based on the characteristics of the telecentric lens, it can be ensured that the light emitted by each point on the sample to be tested is collected at a symmetrical angle and enters the optical system of the camera.
  • the light emitted by points A and B is collected at a symmetrical angle and enters the optical system of the camera.
  • the working distance of the camera is determined according to the actual design working distance of the telecentric lens. Generally, the larger the size of the sample to be tested, the larger the working distance.
  • the image of the sample to be tested is the image under any channel (any of the R/G/B channels); if the chromaticity of the sample to be tested is measured,
  • the image of the sample to be tested includes images under each channel, for example, the image under the R channel, the image under the G channel, and the image under the B channel.
  • the images under each channel can be obtained by adding filters to the camera, or the camera is a color camera.
  • the obtained image of the sample to be tested includes the image under the R channel, the image under the G channel, and the image under the B channel. Then determine the chromaticity of each point in the image under the R channel, and then sort the corresponding chromaticity of each point according to the relative position of each point to obtain the test chromaticity matrix of the sample to be tested under the R channel.
  • Step S30 using the brightness calibration matrix to calibrate the test brightness matrix, and/or, using the chromaticity calibration matrix to calibrate the test chromaticity matrix to obtain the actual brightness of the sample to be tested and/or or chroma matrix.
  • the obtained test luminance and/or chromaticity matrix needs to be calibrated, so as to obtain the actual luminance and/or chromaticity matrix of the sample to be tested.
  • test brightness matrix there is only one test brightness matrix, and after calibrating it, the actual brightness matrix is obtained, and each element in the actual brightness matrix is the brightness of each point of the sample to be tested finally obtained.
  • the test chromaticity matrix includes the matrix under each channel. After the matrix under each channel is calibrated, the actual chromaticity matrix of the sample to be tested under each channel is obtained. Synthesize the elements at the X position in the actual chromaticity matrix under each channel to obtain the chromaticity at the X position of the sample to be tested.
  • a camera and a preset surface light source are used to obtain a luminance and/or chromaticity calibration matrix, and the lens of the camera is a telecentric lens; the camera is used to obtain an image of the sample to be tested, based on the image of the sample to be tested. image to obtain the test luminance and/or chromaticity matrix of the sample to be tested; use the luminance calibration matrix to calibrate the test luminance matrix, and/or use the chromaticity calibration matrix to calibrate the test chromaticity The matrix is calibrated to obtain the actual luminance and/or chromaticity matrix of the sample to be tested.
  • the step of using a camera and a preset surface light source to obtain a luminance and/or chromaticity calibration matrix includes:
  • the camera uses the camera to acquire an image of a preset surface light source, and obtain a test luminance matrix and/or a chromaticity matrix of the preset surface light source based on the image of the preset surface light source;
  • the luminance calibration matrix and/or the chromaticity calibration matrix after obtaining the luminance calibration matrix and/or the chromaticity calibration matrix, it can be stored in a specific storage area, and when the sample is subsequently measured, it can be obtained directly from the storage area.
  • the step of obtaining the brightness calibration matrix according to the standard brightness matrix of the preset surface light source and the test brightness matrix of the preset surface light source includes:
  • the step of obtaining the chromaticity calibration matrix according to the standard chromaticity matrix of the preset surface light source and the test chromaticity matrix of the preset surface light source includes:
  • the ratio values of the corresponding elements of the standard chromaticity matrix of the preset surface light source and the test chromaticity matrix of the preset surface light source are acquired, and normalized to obtain a chromaticity calibration matrix.
  • obtaining the luminance scale matrix is taken as an example for description.
  • the standard luminance matrix for a preset area light source is:
  • the test brightness matrix of the preset surface light source is:
  • Obtaining the chromaticity calibration matrix is to obtain the ratio values of the corresponding elements of the standard chromaticity matrix and the test chromaticity matrix under each channel of the preset surface light source, and perform normalization processing to obtain the chromaticity calibration matrix under each channel.
  • the embodiment of obtaining the chrominance calibration matrix under each channel is basically the same as the above-mentioned embodiment of obtaining the luminance calibration matrix, and details are not described here.
  • the standard brightness matrix of the preset surface light source is obtained based on the brightness of each point of the preset surface light source measured point by point with a standard single-point luminance meter, and the standard chromaticity of the preset surface light source is obtained.
  • the matrix is obtained based on the chromaticity of each point of the preset surface light source measured point by point with a standard single point colorimeter.
  • the standard brightness matrix of the preset surface light source can be constructed by measuring the brightness of each point of the preset surface light source point by point based on a standard single-point luminance meter.
  • the chromaticity of each point of the preset surface light source under each channel can be measured point by point based on a standard single-point colorimeter, and the standard chromaticity matrix of the preset surface light source under each channel can be obtained.
  • the preset surface light source is an integrating sphere uniform light source
  • the standard brightness matrix of the preset surface light source is constructed based on the following steps:
  • the standard chromaticity matrix of the preset surface light source is constructed based on the following steps:
  • the chromaticity value of any point of the integrating sphere uniform light source is obtained by using a standard single-point colorimeter, and a standard luminance matrix of the preset surface light source is constructed based on the chromaticity value.
  • the preset surface light source is an integrating sphere uniform light source
  • its brightness and chromaticity can be considered to be uniform, that is, the brightness and chromaticity of each point are the same.
  • a standard single-point luminance meter is used to obtain the brightness value of any point of the uniform light source of the integrating sphere, and then the standard brightness matrix of the preset surface light source can be constructed based on the brightness value.
  • the standard chromaticity matrix of the preset surface light source uses a standard single-point colorimeter to obtain the chromaticity value of the integrating sphere uniform light source at any point under each channel, and then construct the preset surface light source under each channel.
  • the number of rows and columns of the standard luminance matrix is determined according to the single measurement size of the standard luminance meter and the size of the preset surface light source.
  • the number of rows and columns of the standard chromaticity matrix is determined according to the single measurement size of the standard colorimeter and the size of the preset surface light source.
  • an embodiment of the present invention further provides a luminance and chromaticity measuring device.
  • FIG. 5 is a schematic diagram of functional modules of an embodiment of a luminance and chromaticity measuring apparatus of the present invention.
  • the luminance and chromaticity measurement device includes:
  • a building module 10 for obtaining a luminance and/or chromaticity calibration matrix by using a camera and a preset surface light source, and the lens of the camera is a telecentric lens;
  • an acquisition module 20 configured to use the camera to acquire an image of the sample to be tested, and to obtain a test luminance and/or chromaticity matrix of the sample to be tested based on the image of the sample to be tested;
  • the calibration module 30 is configured to use the luminance calibration matrix to calibrate the test luminance matrix, and/or use the chromaticity calibration matrix to calibrate the test chromaticity matrix, so as to obtain the actual value of the sample to be tested.
  • Luminance and/or chrominance matrices are configured to use the luminance calibration matrix to calibrate the test luminance matrix, and/or use the chromaticity calibration matrix to calibrate the test chromaticity matrix, so as to obtain the actual value of the sample to be tested.
  • the building module 10 is used to:
  • the camera uses the camera to acquire an image of a preset surface light source, and obtain a test luminance matrix and/or a chromaticity matrix of the preset surface light source based on the image of the preset surface light source;
  • the building module 10 is used to:
  • the ratio values of the corresponding elements of the standard chromaticity matrix of the preset surface light source and the test chromaticity matrix of the preset surface light source are acquired, and normalized to obtain a chromaticity calibration matrix.
  • the standard brightness matrix of the preset surface light source is obtained based on the brightness of each point of the preset surface light source measured point by point with a standard single-point luminance meter, and the standard chromaticity of the preset surface light source is obtained.
  • the matrix is obtained based on the chromaticity of each point of the preset surface light source measured point by point with a standard single point colorimeter.
  • the preset surface light source is an integrating sphere uniform light source
  • the standard brightness matrix of the preset surface light source is constructed based on the following steps:
  • the standard chromaticity matrix of the preset surface light source is constructed based on the following steps:
  • the chromaticity value of any point of the integrating sphere uniform light source is obtained by using a standard single-point colorimeter, and a standard luminance matrix of the preset surface light source is constructed based on the chromaticity value.
  • each module in the above-mentioned luminance and chromaticity measurement device corresponds to each step in the above-mentioned embodiment of the luminance and chromaticity measurement method, and the functions and implementation process thereof will not be repeated here.
  • an embodiment of the present invention further provides a readable storage medium.
  • the readable storage medium of the present invention stores a luminance and chromaticity measurement program, wherein when the luminance and chromaticity measurement program is executed by the processor, the steps of the above-mentioned luminance and chromaticity measurement method are implemented.
  • the method implemented when the luminance and chromaticity measurement program is executed may refer to the various embodiments of the luminance and chromaticity measurement method of the present invention, which will not be repeated here.

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Abstract

一种亮度色度测量方法、装置、设备及可读存储介质。方法包括：（S10）利用相机和预置面光源获取亮度和/或色度标定矩阵，相机的镜头为远心镜头；（S20）利用相机获取待测样品的图像，基于待测样品的图像，得到待测样品的测试亮度和/或色度矩阵；（S30）利用亮度标定矩阵对测试亮度矩阵进行标定，和/或，利用色度标定矩阵对测试色度矩阵进行标定，得到待测样品的实际亮度和/或色度矩阵。基于远心镜头的特性，能够避免在对样品进行亮度和/或色度测量时，视场角带来的测量误差，且对基于图像得到的亮度和/或色度矩阵进行标定，进一步提升了最终的亮度和/或色度测量结果的精度。

Description

亮度色度测量方法、装置、设备及可读存储介质 技术领域
本发明涉及颜色测量技术领域，尤其涉及一种亮度色度测量方法、装置、设备及可读存储介质。
背景技术
在纺织、印染以及显示面板行业，一般需要通过亮度计或色度计测量产品的亮度和色度。而亮度计或色度计又分为点式的和成像式的。其中，点式的亮度或色度计，需要对产品进行逐点测量，从而得到产品各个点的亮度或某一通道下的色度；成像式的亮度或色度计，可以一次测得产品各个点的亮度或某一通道下的色度。从测量效率来看，成像式的亮度或色度计要明显优于点式的亮度或色度计。
但是成像式的亮度或色度计存在较大的误差问题。参照图1，图1为现有技术中成像式的亮度或色度计对待检测样品进行测量的场景示意图。如图1所示，待检测样品，如显示屏，印染纺织品，其发光(视角)特性，在各个角度上并不相同。如图1中A点和B点，B点发出的光线以对称角度收集进入成像式的亮度或色度计的光学系统；而A点的光线以一个视场角的角度倾斜进入光学系统，必然导致一部分光线未被收集。所以在实际用成像式的亮度或色度计测量时，测量的是不同区域位置，不同视场角下的亮度或色度特性。因此，最终得到的测量结果并不准确。
发明内容
本发明的主要目的在于提供一种亮度色度测量方法、装置、设备及可读存储介质，旨在解决现有技术中通过成像式的亮度或色度计对待检测样品进行亮度和/或色度测量，最终得到的测量结果不准确的技术问题。
第一方面，本发明提供一种亮度色度测量方法，所述亮度色度测量方法包括：
利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；
利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；
利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。
可选的，所述利用相机和预置面光源获取亮度和/或色度标定矩阵的步骤包括：
利用所述相机获取预置面光源的图像，基于所述预置面光源的图像，得到所述预置面光源的测试亮度矩阵和/或色度矩阵；
根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵，和/或，根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵。
可选的，所述根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵的步骤包括：
获取预置面光源的标准亮度矩阵和预置面光源的测试亮度矩阵对应元素的比例值，并进行归一化处理，得到亮度标定矩阵；
所述根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵的步骤包括：
获取预置面光源的标准色度矩阵和预置面光源的测试色度矩阵对应元素的比例值，并进行归一化处理，得到色度标定矩阵。
可选的，所述预置面光源的标准亮度矩阵基于标准的单点亮度计逐点测量的预置面光源的各点的亮度获得，所述预置面光源的标准色度矩阵基于标准的单点色度计逐点测量的预置面光源的各点的色度获得。
可选的，所述预置面光源为积分球均匀光源，所述预置面光源的标准亮度矩阵基于如下步骤构建：
利用标准单点亮度计获取所述积分球均匀光源任意一点的亮度值，基于该亮度值构建所述预置面光源的标准亮度矩阵；
所述预置面光源的标准色度矩阵基于如下步骤构建：
利用标准单点色度计获取所述积分球均匀光源任意一点的色度值，基于该色度值构建所述预置面光源的标准亮度矩阵。
第二方面，本发明还提供一种亮度色度测量装置，所述亮度色度测量装置包括：
构建模块，用于利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；
获取模块，用于利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；
标定模块，用于利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。
第三方面，本发明还提供一种亮度色度测量设备，所述亮度色度测量设备包括处理器、存储器、以及存储在所述存储器上并可被所述处理器执行的亮度色度测量程序，其中所述亮度色度测量程序被所述处理器执行时，实现如上所述的亮度色度测量方法的步骤。
第四方面，本发明还提供一种可读存储介质，所述可读存储介质上存储有亮度色度测量程序，其中所述亮度色度测量程序被处理器执行时，实现如上所述的亮度色度测量方法的步骤。
本发明中，利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。通过本发明，基于远心镜头的特性，能够避免在对样品进行亮度和/或色度测量时，视场角带来的测量误差，且对基于图像得到的亮度和/或色度矩阵进行标定，进一步提升了最终的亮度和/或色度测量结果的精度。
附图说明
图1为现有技术中成像式的亮度或色度计对待检测样品进行测量的场景示意图；
图2为本发明实施例方案中涉及的亮度色度测量设备的硬件结构示意图；
图3为本发明亮度色度测量方法一实施例的流程示意图；
图4为一实施例中对待检测样品进行拍摄的场景示意图；
图5为本发明亮度色度测量装置一实施例的功能模块示意图。
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
第一方面，本发明实施例提供一种亮度色度测量设备。
参照图2，图2为本发明实施例方案中涉及的亮度色度测量设备的硬件结构示意图。本发明实施例中，亮度色度测量设备可以包括处理器1001(例如中央处理器Central Processing Unit，CPU)，通信总线1002，用户接口1003，网络接口1004，存储器1005。其中，通信总线1002用于实现这些组件之间的连接通信；用户接口1003可以包括显示屏(Display)、输入单元比如键盘(Keyboard)；网络接口1004可选的可以包括标准的有线接口、无线接口(如无线保真WIreless-FIdelity，WI-FI接口)；存储器1005可以是高速随机存取存储器(random access memory，RAM)，也可以是稳定的存储器(non-volatile memory)，例如磁盘存储器，存储器1005可选的还可以是独立于前述处理器1001的存储装置。本领域技术人员可以理解，图2中示出的硬件结构并不构成对本发明的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
继续参照图2，图2中作为一种计算机存储介质的存储器1005中可以包括操作系统、网络通信模块、用户接口模块以及亮度色度测量程序。其中，处理器1001可以调用存储器1005中存储的亮度色度测量程序，并执行本发明实施例提供的亮度色度测量方法。
第二方面，本发明实施例提供了一种亮度色度测量方法。
参照图3，图3为本发明亮度色度测量方法一实施例的流程示意图。如图3所示，亮度色度测量方法包括：
步骤S10，利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；
本实施例中，利用相机对预置面光源进行拍摄，得到预置面光源的图像，然后提取预置面光源的图像上各点的亮度值和/或色度值，得到预置面光源的测试亮度和/或色度矩阵。然后，根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵，和/或，根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵。
步骤S20，利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；
本实施例中，待测样品可以是显示屏或印染纺织品等。通过相机对待测样品进行拍摄，得到待测样品的图像，其中，相机的镜头为远心镜头。如图4所示，图4为一实施例中对待检测样品进行拍摄的场景示意图。图4中的远心成像镜头即远心镜头。基于远心镜头的特性，可以保证待检测样品上各点发出的光线以对称角度收集进入相机的光学系统，如点A、B发出的光线以对称角度收集进入相机的光学系统。其中，相机的工作距离根据远心镜头的实际设计工作距离来确定。一般的，待检测样品尺寸越大，工作距离越大。
容易理解的是，若是对待测样品的亮度进行测量，则待测样品的图像是在任一通道下(R/G/B通道中的任一个)的图像；若是对待测样品的色度进行测量，则待测样品的图像包括各个通道下的图像，例如R通道下的图像、G通道下的图像以及B通道下的图像。其中各个通道下的图像可以通过在相机上加装滤镜得到，或者相机为彩色相机。
以测量亮度为例，得到待测样品的图像后，确定图像中各点的亮度，然后按照各点的相对位置，对各点对应的亮度进行排序，得到待测样品的测试亮度矩阵。
以测量色度为例，得到的待测样品的图像包括R通道下的图像、G通道下的图像以及B通道下的图像。则确定R通道下的图像中各点的色度，然后按照各点的相对位置，对各点对应的色度进行排序，得到待测样品在R通道下的测试色度矩阵，同理，得到待测样品在G通道下的测试色度矩阵以及待 测样品在B通道下的测试色度矩阵。
步骤S30，利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。
本实施例中，为了进一步提高测量精度，需要对得到的测试亮度和/或色度矩阵进行标定，从而得到待测样品的实际亮度和/或色度矩阵。
其中，测试亮度矩阵只有一个，对其标定后，得到实际亮度矩阵，实际亮度矩阵中的每个元素即最终得到的待测样品的各个点的亮度。测试色度矩阵包括各个通道下的矩阵，分别对各个通道下的矩阵进行标定后，得到待测样品在各个通道下的实际色度矩阵。综合各个通道下的实际色度矩阵中X位置处的元素，即得到待测样品X位置处的色度。
本实施例中，利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。通过本实施例，基于远心镜头的特性，能够避免在对样品进行亮度和/或色度测量时，视场角带来的测量误差，且对基于图像得到的亮度和/或色度矩阵进行标定，进一步提升了最终的亮度和/或色度测量结果的精度。
进一步地，一实施例中，所述利用相机和预置面光源获取亮度和/或色度标定矩阵的步骤包括：
利用所述相机获取预置面光源的图像，基于所述预置面光源的图像，得到所述预置面光源的测试亮度矩阵和/或色度矩阵；
根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵，和/或，根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵。
本实施例中，得到亮度标定矩阵和/或色度标定矩阵后，可将其保存在特定存储区域，后续对样本进行测量时，直接从存储区域获取即可。
进一步地，一实施例中，所述根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵的步骤包括：
获取预置面光源的标准亮度矩阵和预置面光源的测试亮度矩阵对应元素的比例值，并进行归一化处理，得到亮度标定矩阵；
所述根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵的步骤包括：
获取预置面光源的标准色度矩阵和预置面光源的测试色度矩阵对应元素的比例值，并进行归一化处理，得到色度标定矩阵。
本实施例中，以获得亮度标度矩阵为例进行说明。
例如，预置面光源的标准亮度矩阵为：
Figure PCTCN2021081505-appb-000001
预置面光源的测试亮度矩阵为：
Figure PCTCN2021081505-appb-000002
则比例值为：
Figure PCTCN2021081505-appb-000003
然后对比例值进行归一化处理，得到亮度标定矩阵。
获得色度标定矩阵即获取预置面光源各个通道下的标准色度矩阵和测试色度矩阵对应元素的比例值，并进行归一化处理，获得各个通道下的色度标定矩阵。获得每个通道下的色度标定矩阵的实施例与上述获得亮度标度矩阵的实施例基本相同，在此不做赘述。
进一步地，一实施例中，所述预置面光源的标准亮度矩阵基于标准的单点亮度计逐点测量的预置面光源的各点的亮度获得，所述预置面光源的标准色度矩阵基于标准的单点色度计逐点测量的预置面光源的各点的色度获得。
本实施例中，基于标准的单点亮度计逐点测量预置面光源的各点的亮度，即可构建预置面光源的标准亮度矩阵。同理，基于标准的单点色度计逐点测 量预置面光源在各个通道下各点的色度，即可得到预置面光源在各个通道下的标准色度矩阵。
进一步地，一实施例中，所述预置面光源为积分球均匀光源，所述预置面光源的标准亮度矩阵基于如下步骤构建：
利用标准单点亮度计获取所述积分球均匀光源任意一点的亮度值，基于该亮度值构建所述预置面光源的标准亮度矩阵；
所述预置面光源的标准色度矩阵基于如下步骤构建：
利用标准单点色度计获取所述积分球均匀光源任意一点的色度值，基于该色度值构建所述预置面光源的标准亮度矩阵。
本实施例中，当预置面光源为积分球均匀光源时，可认为其亮度和色度是均匀的，即每个点的亮度相同，色度相同。
基于此，在构建预置面光源的标准亮度矩阵时，利用标准单点亮度计获取积分球均匀光源任意一点的亮度值，即可基于该亮度值构建预置面光源的标准亮度矩阵。
同理，在构建预置面光源的标准色度矩阵时，利用标准单点色度计获取积分球均匀光源在各个通道下任意一点的色度值，即可构建预置面光源在各个通道下的标准色度矩阵。
其中，标准亮度矩阵的行数以及列数，根据标准亮度计的单次测量尺寸以及预置面光源的尺寸确定。同理，标准色度矩阵的行数以及列数，根据标准色度计的单次测量尺寸以及预置面光源的尺寸确定。
第三方面，本发明实施例还提供一种亮度色度测量装置。
参照图5，图5为本发明亮度色度测量装置一实施例的功能模块示意图。如图5所示，亮度色度测量装置包括：
构建模块10，用于利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；
获取模块20，用于利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；
标定模块30，用于利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测 样品的实际亮度和/或色度矩阵。
进一步地，一实施例中，构建模块10用于：
利用所述相机获取预置面光源的图像，基于所述预置面光源的图像，得到所述预置面光源的测试亮度矩阵和/或色度矩阵；
根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵，和/或，根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵。
进一步地，一实施例中，构建模块10用于：
获取预置面光源的标准亮度矩阵和预置面光源的测试亮度矩阵对应元素的比例值，并进行归一化处理，得到亮度标定矩阵；
和/或，
获取预置面光源的标准色度矩阵和预置面光源的测试色度矩阵对应元素的比例值，并进行归一化处理，得到色度标定矩阵。
进一步地，一实施例中，所述预置面光源的标准亮度矩阵基于标准的单点亮度计逐点测量的预置面光源的各点的亮度获得，所述预置面光源的标准色度矩阵基于标准的单点色度计逐点测量的预置面光源的各点的色度获得。
进一步地，一实施例中，所述预置面光源为积分球均匀光源，所述预置面光源的标准亮度矩阵基于如下步骤构建：
利用标准单点亮度计获取所述积分球均匀光源任意一点的亮度值，基于该亮度值构建所述预置面光源的标准亮度矩阵；
所述预置面光源的标准色度矩阵基于如下步骤构建：
利用标准单点色度计获取所述积分球均匀光源任意一点的色度值，基于该色度值构建所述预置面光源的标准亮度矩阵。
其中，上述亮度色度测量装置中各个模块的功能实现与上述亮度色度测量方法实施例中各步骤相对应，其功能和实现过程在此处不再一一赘述。
第四方面，本发明实施例还提供一种可读存储介质。
本发明可读存储介质上存储有亮度色度测量程序，其中所述亮度色度测量程序被处理器执行时，实现如上述的亮度色度测量方法的步骤。
其中，亮度色度测量程序被执行时所实现的方法可参照本发明亮度色度 测量方法的各个实施例，此处不再赘述。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者系统不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者系统所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者系统中还存在另外的相同要素。
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在如上所述的一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备执行本发明各个实施例所述的方法。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种亮度色度测量方法，其特征在于，所述亮度色度测量方法包括：
    利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；
    利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；
    利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。
  2. 如权利要求1所述的亮度色度测量方法，其特征在于，所述利用相机和预置面光源获取亮度和/或色度标定矩阵的步骤包括：
    利用所述相机获取预置面光源的图像，基于所述预置面光源的图像，得到所述预置面光源的测试亮度矩阵和/或色度矩阵；
    根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵，和/或，根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵。
  3. 如权利要求2所述的亮度色度测量方法，其特征在于，所述根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵的步骤包括：
    获取预置面光源的标准亮度矩阵和预置面光源的测试亮度矩阵对应元素的比例值，并进行归一化处理，得到亮度标定矩阵；
    所述根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵的步骤包括：
    获取预置面光源的标准色度矩阵和预置面光源的测试色度矩阵对应元素的比例值，并进行归一化处理，得到色度标定矩阵。
  4. 如权利要求2所述的亮度色度测量方法，其特征在于，所述预置面光 源的标准亮度矩阵基于标准的单点亮度计逐点测量的预置面光源的各点的亮度获得，所述预置面光源的标准色度矩阵基于标准的单点色度计逐点测量的预置面光源的各点的色度获得。
  5. 如权利要求2所述的亮度色度测量方法，其特征在于，所述预置面光源为积分球均匀光源，所述预置面光源的标准亮度矩阵基于如下步骤构建：
    利用标准单点亮度计获取所述积分球均匀光源任意一点的亮度值，基于该亮度值构建所述预置面光源的标准亮度矩阵；
    所述预置面光源的标准色度矩阵基于如下步骤构建：
    利用标准单点色度计获取所述积分球均匀光源任意一点的色度值，基于该色度值构建所述预置面光源的标准亮度矩阵。
  6. 一种亮度色度测量装置，其特征在于，所述亮度色度测量装置包括：
    构建模块，用于利用相机和预置面光源获取亮度和/或色度标定矩阵，所述相机的镜头为远心镜头；
    获取模块，用于利用所述相机获取待测样品的图像，基于所述待测样品的图像，得到所述待测样品的测试亮度和/或色度矩阵；
    标定模块，用于利用所述亮度标定矩阵对所述测试亮度矩阵进行标定，和/或，利用所述色度标定矩阵对所述测试色度矩阵进行标定，得到所述待测样品的实际亮度和/或色度矩阵。
  7. 如权利要求6所述的亮度色度测量装置，其特征在于，所述构建模块用于：
    利用所述相机获取预置面光源的图像，基于所述预置面光源的图像，得到所述预置面光源的测试亮度矩阵和/或色度矩阵；
    根据预置面光源的标准亮度矩阵以及预置面光源的测试亮度矩阵得到亮度标定矩阵，和/或，根据预置面光源的标准色度矩阵以及预置面光源的测试色度矩阵得到色度标定矩阵。
  8. 如权利要求7所述的亮度色度测量装置，其特征在于，所述构建模块 用于：
    获取预置面光源的标准亮度矩阵和预置面光源的测试亮度矩阵对应元素的比例值，并进行归一化处理，得到亮度标定矩阵；
    和/或，
    获取预置面光源的标准色度矩阵和预置面光源的测试色度矩阵对应元素的比例值，并进行归一化处理，得到色度标定矩阵。
  9. 一种亮度色度测量设备，其特征在于，所述亮度色度测量设备包括处理器、存储器、以及存储在所述存储器上并可被所述处理器执行的亮度色度测量程序，其中所述亮度色度测量程序被所述处理器执行时，实现如权利要求1至5中任一项所述的亮度色度测量方法的步骤。
  10. 一种可读存储介质，其特征在于，所述可读存储介质上存储有亮度色度测量程序，其中所述亮度色度测量程序被处理器执行时，实现如权利要求1至5中任一项所述的亮度色度测量方法的步骤。
PCT/CN2021/081505 2020-11-06 2021-03-18 亮度色度测量方法、装置、设备及可读存储介质 WO2022095321A1 (zh)

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