Automatic grading measurement method of diamond color

An automatic measurement and color grading technology, applied in the direction of color measurement devices, etc., can solve the problems of grading result differences, repeatability, and reproducibility that cannot meet the measurement results, so as to reduce the impact, ensure the signal-to-noise ratio and dynamic range, Effect of reducing measurement system error

Active Publication Date: 2017-05-17
石朴(上海)光学科技有限公司
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Problems solved by technology

Therefore, there are differences between the detection results of this method and the way of human visual color, resulting in differences in grading results
At the same time, due to the different sizes of the...

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  • Automatic grading measurement method of diamond color
  • Automatic grading measurement method of diamond color
  • Automatic grading measurement method of diamond color

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Embodiment Construction

[0039] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0040] An automatic measurement method for diamond color grading, comprising the following steps:

[0041] (1) Adjust the lighting and observation conditions so that the test environment is consistent with the human eye observation environment;

[0042] The lighting and observation conditions are as follows: conform to the lighting conditions of the CIE standard lighting body D65, use a white diffuse reflection background, specify the observation angle of the diamond sample surface, meet the observation conditions that the line of sight is perpendicular to the pavilion when the human eye observes, and the measured ...

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Abstract

The invention discloses an automatic grading measurement method of diamond color; the method includes steps of adjusting lighting and observing conditions so that the testing environment is consistent with environment observed by human eye; accurately positioning by a microscope zone so that the tested point is completely consistent with the measurement position point of a standard colorimetric stone when diamonds with different grains are measured; collecting an image signal and a spectral signal of a sample waist part and a pavilion and every position closing to the bottom point; contrasting a color coordinate of the measurement sample with the color coordinate of every grade standard colorimetric stone point by point; calculating the differential value between the color coordinate of the measurement sample and the color coordinate of every grade standard colorimetric stone, making the color grade of the measurement sample close to the national standard grade with the minimum differential value of the chromaticity coordinate; if the differential value of the color coordinate is consistent with two grades of standards, closing to the lower grade standard. The method guarantees the consistence of the diamond color grading and human eye observation by the automatic measurement system, simulates the traditional colorimetric environment of human eyes, and reduces the bias of the measurement system caused by different observing conditions.

Description

technical field [0001] The invention relates to a measuring device and method conforming to visual diamond color grading, in particular to an automatic measuring method for diamond color grading. Background technique [0002] Diamond color is a very important indicator in diamond evaluation. The national standard is divided into 12 continuous color grades according to the change of diamond color, which are represented by letters and numbers: as shown in Table 1, [0003] Table 1 Diamond Color Grade Table [0004] D 100 E 99 F 98 G 97 H 96 I 95 J 94 K 93 L 92 M 91 N 90 <N <90 [0005] The above-mentioned color grades are all calibrated by master stones. A set of standard color stones is essential in color grading. Our country uses a set of 11 standard color stones. Diamond color grading has always been carried out mainly by human eye observation. This human eye observation method is very strict...

Claims

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Application Information

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IPC IPC(8): G01J3/46
CPCG01J3/46
Inventor 林斌程佑法
Owner 石朴(上海)光学科技有限公司
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