CN115834872A - Method for rapidly measuring three-dimensional color gamut of multi-primary color display system - Google Patents
Method for rapidly measuring three-dimensional color gamut of multi-primary color display system Download PDFInfo
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- CN115834872A CN115834872A CN202211722532.7A CN202211722532A CN115834872A CN 115834872 A CN115834872 A CN 115834872A CN 202211722532 A CN202211722532 A CN 202211722532A CN 115834872 A CN115834872 A CN 115834872A
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Abstract
The invention discloses a method for quickly measuring a three-dimensional color gamut of a multi-primary color display system, which comprises the following steps: measuring the color gamut boundary of the color solid point by a color brightness meter; step two: calculating the volume of the three-dimensional color gamut of the actual display system according to an algorithm described by the three-dimensional color gamut boundary of the display system; the invention utilizes the color brightness meter and different test atlas to measure the color coordinate and brightness of each point of the color solid boundary of the practical display system, then the boundary of the color solid is drawn according to a certain algorithm, and the volume of the solid color gamut is calculated, thereby realizing the measurement of the solid color gamut of different projectors, enabling the measurement to be compared and being capable of rapidly and accurately measuring the solid color gamut; the method for measuring the color gamut of the multi-primary color display system is provided on the basis of the three-primary color display system three-dimensional color gamut measurement, and has strong applicability and wide application range.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a method for quickly measuring a three-dimensional color gamut of a multi-primary color display system.
Background
Color gamut is one of the most important parameters of a display system, characterizing the ability of the display system to render colors. Early color gamuts were based on the planar gamut area of the CIE-xy chromaticity diagram, and are still currently in use in most industries due to their simple and intuitive nature.
However, color is a three-dimensional physical quantity including hue, saturation and brightness, so that the color gamut obtained in the planar chromaticity diagram without brightness information is inaccurate, and we need to accurately measure the color gamut volume of the display system in the stereoscopic color gamut.
Disclosure of Invention
The invention aims to provide a method for rapidly measuring a three-dimensional color gamut of a multi-primary color display system, which measures the color coordinates and the brightness of each point of the color three-dimensional boundary of an actual display system by using a color brightness meter and different test atlas sets, then draws the boundary of the color three-dimensional according to a certain algorithm, and calculates the volume of the three-dimensional color gamut.
A method for rapidly measuring a three-dimensional color gamut of a multi-primary display system comprises the following steps:
the method comprises the following steps: measuring the color gamut boundary of the color solid point by a color brightness meter;
step two: and calculating the stereo color gamut volume of the actual display system according to an algorithm described by the stereo color gamut boundary of the display system.
As a further scheme of the invention: in the first step, the process of obtaining the color gamut boundary is as follows:
s1: preparing a test diagram set;
s2: starting the projector, fixing a standard white board in front of the projector as a screen, placing a color brightness meter at a position 3 meters away from the screen within a small angle, focusing, sequentially measuring color coordinates and brightness of the projector when the projector projects different test images, and recording;
s3: from the color coordinates and luminance data obtained in S2, the color gamut boundary is drawn in the CIELAB space.
As a further scheme of the invention: in S1, the test chart set is drawn by a computer.
As a further scheme of the invention: in S2, the color coordinates and brightness for different test patterns are read by a color brightness meter and recorded.
As a further scheme of the invention: in S3, the description of the gamut boundary in CIELAB space is rendered in a computer with the matlab program in order based on a measured series of color coordinates and luminance values.
As a further scheme of the invention: superposing the color gamut coverage range under each hue angle and brightness to obtain the whole coverage color gamut, and calculating the volume of the three-dimensional color gamut, specifically: after the color gamut boundary is obtained through drawing, dividing the color gamut boundary into one hundred layers according to brightness in a CIELAB space through a matlab program by a division approximation method, calculating the area of each layer, multiplying the area by the height, and finally summing to obtain the three-dimensional color gamut volume.
The invention has the beneficial effects that: the invention realizes the measurement of the three-dimensional color gamut of different projectors, so that the measurement can be carried out, and the three-dimensional color gamut can be rapidly and accurately measured;
the method for measuring the color gamut of the multi-primary color display system is provided on the basis of the three-primary color display system three-dimensional color gamut measurement, and has strong applicability and wide application range.
Drawings
The invention will be further described with reference to the accompanying drawings.
Fig. 1 is a drawing flow chart of a stereoscopic color gamut map according to the present invention.
Fig. 2 is a schematic diagram of a stereo color gamut measurement sequence of the present invention.
Fig. 3 is a schematic illustration of the gamut volume of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a method for rapidly measuring a stereoscopic color gamut of a multi-primary display system, including:
the method comprises the following steps: measuring the color gamut boundary of the color solid point by a color brightness meter;
step two: and calculating the stereo color gamut volume of the actual display system according to an algorithm described by the stereo color gamut boundary of the display system.
In one particular embodiment:
taking the three primary color algorithm as an example:
s1: preparing a test chart set: a test chart is made on a computer, and comprises 1 black dot (0, 0), 8 monochromatic red lights (32, 0) to (255, 0), 8 monochromatic green lights (0, 32, 0) to (0, 255, 0), 8 monochromatic blue lights (0, 32) to (0, 255) for a total of 8 sheets, a two-color mixed such as (32, 0), (32, 0, 32), etc. for a total of 24 sheets, and a three-color mixed such as (255, 255, 255) for a total of 8 sheets, for a total of 57 test charts;
s2: starting a projector, fixing a standard white board in front of the projector as a screen, and placing a color brightness meter at a proper distance within a small angle;
after focusing, sequentially measuring and recording color coordinates and brightness when the projector projects different test charts;
s3: and drawing a color gamut boundary in a CIELAB space according to the color coordinate and brightness data obtained by testing, and calculating a three-dimensional color gamut volume.
Take six primary color projector as an example
V1: starting a projector, and sequentially adjusting the intensity of each started primary color to the proportion shown in the following table for the six-primary-color projector;
for example, 445nm, which is the maximum value when 445nm blue light is turned on to white balance, 445nm, 465nm, which is the maximum value when 445nm and 465nm blue light are turned on to white balance, and so on;
v2: after the measurement of the data in the above table is completed, drawing a three-dimensional color gamut diagram in the CIE xyY space as shown in fig. 1, according to a three-dimensional color gamut measurement sequence table as shown in fig. 2, and converting into the CIELAB space to calculate the color gamut volume as shown in fig. 3;
each line segment can be divided into 3-8 segments, and the coordinates of each point are measured in sequence, so that a more accurate three-dimensional color gamut map and numerical values are obtained.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (6)
1. A method for rapidly measuring a three-dimensional color gamut of a multi-primary-color display system is characterized by comprising the following steps of:
the method comprises the following steps: measuring the color gamut boundary of the color solid point by a color brightness meter;
step two: and calculating the stereo color gamut volume of the actual display system according to an algorithm drawn by the stereo color gamut boundary of the display system.
2. The method for rapidly measuring the stereoscopic color gamut of the multi-primary display system according to claim 1, wherein in the first step, the process of obtaining the color gamut boundary comprises:
s1: preparing a test chart set;
s2: starting the projector, fixing a standard white board in front of the projector as a screen, placing a color brightness meter at a position 3 meters away from the screen within a small angle, focusing, sequentially measuring color coordinates and brightness of the projector when the projector projects different test images, and recording;
s3: from the color coordinates and luminance data obtained at S2, the gamut boundary is plotted in the C IELAB space.
3. The method for rapidly measuring the stereoscopic color gamut of a multi-primary display system according to claim 2, wherein in S1, the test atlas is drawn by a computer.
4. The method of claim 2, wherein in S2, the color coordinates and brightness of different test patterns are recorded by reading the measured color coordinates and brightness values with a color brightness meter.
5. The method of claim 2, wherein in step S3, the description of the color gamut boundary in the cai ELAB space is sequentially rendered in the computer by a matlab program according to the measured set of color coordinates and luminance values.
6. The method for rapidly measuring the stereoscopic color gamut of a multi-primary display system according to claim 4, wherein the coverage ranges of the color gamut under each hue angle and brightness are overlapped to obtain the whole coverage color gamut, and the stereoscopic color gamut volume is calculated, specifically: after the color gamut boundary is obtained through drawing, dividing the color gamut boundary into one hundred layers according to brightness in a CIELAB space through a matlab program by a division approximation method, calculating the area of each layer, multiplying the area by the height, and finally summing to obtain the three-dimensional color gamut volume.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773022A (en) * | 2023-08-21 | 2023-09-19 | 武汉精一微仪器有限公司 | Stereoscopic color gamut measurement method and system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773022A (en) * | 2023-08-21 | 2023-09-19 | 武汉精一微仪器有限公司 | Stereoscopic color gamut measurement method and system |
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