CN114739644A - Method, device and equipment for judging color cast and readable storage medium - Google Patents

Method, device and equipment for judging color cast and readable storage medium Download PDF

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Publication number
CN114739644A
CN114739644A CN202210653478.9A CN202210653478A CN114739644A CN 114739644 A CN114739644 A CN 114739644A CN 202210653478 A CN202210653478 A CN 202210653478A CN 114739644 A CN114739644 A CN 114739644A
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Prior art keywords
distance
preset
color cast
color
less
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Inventor
刘洒
杨楷
杨阳
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Wuhan Jingce Electronic Group Co Ltd
Wuhan Jingli Electronic Technology Co Ltd
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Wuhan Jingce Electronic Group Co Ltd
Wuhan Jingli Electronic Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/02—Testing optical properties
    • G01M11/0285—Testing optical properties by measuring material or chromatic transmission properties
    • 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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0004—Industrial image inspection
    • 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
    • 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
    • G01J2003/467—Colour computing
    • 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
    • G06T2207/10004—Still image; Photographic 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/30—Computing systems specially adapted for manufacturing

Abstract

The invention provides a method, a device and equipment for judging color cast and readable storage media. The method comprises the following steps: acquiring a color coordinate point P of a region to be measured on a CIE 1931 chromaticity coordinate diagram; calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram; and determining the color cast grade of the area to be detected according to the distance and the included angle. By the adoption of the method, the problem of errors caused by a rectangular frame type card control method is effectively solved, and the accuracy of color cast judgment and the like is improved based on the card control method of the chromaticity circle (combined with the distance and the included angle).

Description

Method, device and equipment for judging color cast and readable storage medium
Technical Field
The present invention relates to the field of automatic optical detection technologies, and in particular, to a method, an apparatus, a device, and a readable storage medium for color cast determination.
Background
The automatic optical detection system is widely applied in industry, can replace people to complete a series of work with high repeatability and certain risk, has the characteristics of high speed, high precision, good reliability, no contact, no damage, high cost performance, strong universality and the like, and improves the production efficiency of a production line.
The detection accuracy of the display panel is particularly important in panel manufacturing, and a defect detection algorithm is used as the core of a panel defect detection system, and the detection effect directly determines the satisfaction degree of a customer. In recent years, accurate detection of color shift-like defects has been a challenge, especially for weak color shifts of that large area. At present, a colorimeter with stronger detection capability can be used for effectively solving the problem, measuring the colorimetric value of a region to be detected and judging the color cast condition of the region to be detected by controlling the colorimetric value in a clamping manner, but the conventional rectangular frame type card control method (wherein X is more than or equal to A and less than or equal to B, and C is more than or equal to C and less than or equal to D) is difficult to accurately set reasonable X and Y chromaticity card control ranges, and because the color gamut distribution of red, green, blue and the like in a standard CIE chromaticity diagram is not a regular rectangle but a curve distribution with radian, the conventional rectangular card control method has great error on the final chromaticity measurement judgment result, so that the color cast judgment and other structures are not accurate enough.
Disclosure of Invention
The invention mainly aims to provide a method, a device and equipment for color cast judgment and the like and a readable storage medium, and aims to solve the technical problem that in the prior art, the results of color cast judgment and the like based on a conventional rectangular card control method are not accurate enough.
In a first aspect, the present invention provides a method for color cast determination, the method comprising:
acquiring a color coordinate point P of a region to be measured on a CIE 1931 chromaticity coordinate diagram;
calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram;
and determining the color cast grade of the area to be detected according to the distance and the included angle.
Optionally, the step of determining the color cast grade of the region to be measured according to the distance and the included angle includes:
and when the distance is greater than or equal to zero and less than or equal to a first preset distance, determining that the color cast grade of the area to be detected is color cast-free.
Optionally, the step of determining the color cast grade of the region to be measured according to the distance and the included angle further includes:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is slightly reddish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is moderate reddish;
and when the distance is greater than the third preset distance and the included angle is greater than the first preset angle and less than the second preset angle, determining that the color cast grade of the area to be detected is severe red.
Optionally, the step of determining the color cast grade of the region to be measured according to the distance and the included angle further includes:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be detected is slightly greenish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be detected is moderate green;
and when the distance is greater than the third preset distance, and the included angle is greater than the second preset angle and smaller than the third preset angle, determining that the color cast grade of the area to be detected is severe green.
Optionally, the step of determining the color cast grade of the region to be measured according to the distance and the included angle further includes:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, the included angle is greater than a third preset angle and less than 180 degrees, or the included angle is greater than-180 degrees and less than the first preset angle, determining that the color cast grade of the area to be detected is slightly bluish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the region to be detected is medium bluish;
and when the distance is greater than the third preset distance, and the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the area to be detected is heavily bluish.
In a second aspect, the present invention further provides a color cast judging device, including:
the acquisition module is used for acquiring a color coordinate point P of the area to be measured on a CIE 1931 chromaticity coordinate diagram;
the calculation module is used for calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram;
and the judging module is used for determining the color cast grade of the area to be detected according to the distance and the included angle.
Optionally, the module for determining is configured to:
and when the distance is greater than or equal to zero and less than or equal to a first preset distance, determining that the color cast grade of the area to be detected is color cast-free.
Optionally, the module for determining and the like is further configured to:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is slightly reddish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be measured is moderate reddish;
and when the distance is greater than the third preset distance and the included angle is greater than the first preset angle and less than the second preset angle, determining that the color cast grade of the area to be detected is severe red.
In a third aspect, the present invention further provides a device for color cast judgment, which includes a processor, a memory, and a program for color cast judgment stored in the memory and executable by the processor, wherein when the program for color cast judgment is executed by the processor, the steps of the method for color cast judgment are implemented.
In a fourth aspect, the present invention further provides a readable storage medium, where a program for color cast judgment is stored, where the program for color cast judgment is executed by a processor to implement the steps of the method for color cast judgment.
In the invention, a color coordinate point P of a region to be measured on a CIE 1931 chromaticity coordinate diagram is obtained; calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram; and determining the color cast grade of the area to be detected according to the distance and the included angle. By the adoption of the method, the problem of errors caused by a rectangular frame type card control method is effectively solved, and the accuracy of color cast judgment and the like is improved based on the card control method of the chromaticity circle (combined with the distance and the included angle).
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a color cast judgment device and the like according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a color cast determination method according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a CIE 1931 chromaticity coordinate diagram;
FIG. 4 is a schematic diagram of a CIE 1931 chromaticity coordinate diagram with an isoenergetic white light spot E as a coordinate origin to construct a new coordinate system;
FIG. 5 is a schematic view of a blue-emitting screen body in one embodiment;
fig. 6 is a schematic diagram of color cast judgment and the like according to a rectangular frame type card control method;
fig. 7 is a schematic diagram of functional modules of an embodiment of a color cast determination apparatus according to the invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, embodiments of the present invention provide a device for color cast determination, which may be a Personal Computer (PC), a notebook computer, a server, or other devices having a data processing function.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a device for color cast determination and the like according to an embodiment of the present invention. In this embodiment of the present invention, the device for color cast determination may include a processor 1001 (e.g., a 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 for realizing connection communication among the 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 (e.g., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to fig. 1, a memory 1005, which is one type of computer storage medium in fig. 1, may include programs such as an operating system, a network communication module, a user interface module, and color cast. The processor 1001 may call a program such as color cast judgment stored in the memory 1005, and execute a method such as color cast judgment provided by the embodiment of the present invention.
In a second aspect, an embodiment of the present invention provides a method for color cast determination.
In an embodiment, referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of a color cast determination method according to the present invention. As shown in fig. 2, the methods of color cast, etc. include:
step S10, acquiring a color coordinate point P of the area to be measured on a CIE 1931 chromaticity coordinate diagram;
in this embodiment, chromaticity information of the area to be measured on the screen, that is, the color coordinates (x, y) of the area to be measured on the CIE 1931 chromaticity coordinate diagram, is obtained based on the optical instrument colorimeter/meter, so as to obtain the corresponding color coordinate point P.
Step S20, calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram;
in this embodiment, on the basis of the color coordinates (x, y) on the CIE 1931 chromaticity coordinate diagram, the corresponding point P may be determined, the color coordinates of the isoenergetic albedo point E on the CIE 1931 chromaticity coordinate diagram are known, and based on this, the distance D between the point P and the isoenergetic albedo point E and the included angle θ between the connecting line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram may be calculated.
Referring to fig. 3, fig. 3 is a schematic diagram of a CIE 1931 chromaticity coordinate diagram. The parameters in the diagram can be referred to the description of the CIE 1931 chromaticity coordinate diagram in the prior art, and the coordinate of the isoenergetic whitelight point E in the CIE 1931 chromaticity coordinate diagram is (0.3333 ). It is easy to understand that, knowing the coordinates of two points (point P and point E) in the same coordinate system, the distance between the two points and the angle between the line formed by the two points and the x-axis of the coordinate system can be known.
And step S30, determining the color cast grade of the area to be measured according to the distance and the included angle.
In this embodiment, based on the distance D and the included angle θ calculated in step S20, the color cast level of the region to be measured can be determined according to a preset criterion such as judgment.
In the embodiment, a color coordinate point P of a region to be measured on a CIE 1931 chromaticity coordinate diagram is obtained; calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram; and determining the color cast grade of the area to be detected according to the distance and the included angle. By the adoption of the embodiment, the error problem caused by the rectangular frame type card control method is effectively solved based on the card control method of the chromaticity circle (combining the distance and the included angle), and the accuracy of color cast judgment and the like is improved.
Referring to fig. 4, fig. 4 is a schematic diagram of constructing a new coordinate system on the CIE 1931 chromaticity diagram with the isoenergetic white light point E as the origin of coordinates. As shown in fig. 4, only the chromaticity diagram color gamut is divided into three major categories of red, green and blue,
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1、
Figure 546617DEST_PATH_IMAGE001
2、
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3 is the boundary of the color gamut, and the color cast of red, blue and green is respectively along
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4、
Figure 784459DEST_PATH_IMAGE001
5、
Figure 813595DEST_PATH_IMAGE001
6 are gradually increased in the direction of the arrow. C1, C2, and C3 are circles having radii of R1 (0.06), R2 (0.14), and R3 (0.22), respectively, with a point O (i.e., an isoenergetic white spot E) as a center.
The coordinates of the color gamut boundary points O, P1, P2, and P3 on the CIE 1931 chromaticity coordinate diagram are shown in table 1:
Figure 241034DEST_PATH_IMAGE002
in FIG. 4
Figure 722831DEST_PATH_IMAGE003
r、
Figure 870916DEST_PATH_IMAGE003
g、
Figure 629924DEST_PATH_IMAGE003
b correspond to the following angular ranges:
Figure 103631DEST_PATH_IMAGE003
r：θ1＜θ＜θ2；
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g：θ2＜θ＜θ3；
Figure 671106DEST_PATH_IMAGE003
b: theta 3 is more than theta and less than pi or-pi is more than theta and less than theta 1;
with reference to fig. 4 and the above data, the following rules such as color cast judgment can be formulated:
1. OK, i.e. no color cast (D ≦ 0 ≦ R1)
2.1, slight reddening (R1 < D ≦ R2 and theta 1 < theta 2)
2.2, moderately reddish (R2 < D. ltoreq.R 3 and theta 1 < theta. ltoreq.theta 2)
2.3, heavy reddish (D > R3 and theta 1 < theta 2)
3.1, slight greenish (R1 < D ≦ R2 and θ 2 < θ 3)
3.2, moderate greenish (R2 < D ≦ R3 and theta 2 < theta 3)
3.3, heavy greenish (D > R3 and theta 2 < theta 3)
4.1, slightly bluish (R1 < D. ltoreq.R 2 and θ 3 < θ < π/- π < θ 1)
4.2, moderately bluish (R2 < D. ltoreq.R 3 and θ 3 < θ < π/- π < θ 1)
4.3, severe bluish (D > R3 and θ 3 < θ < π/- π < θ 1)
Recording R1 as a first preset distance, R2 as a second preset distance, R3 as a third preset distance, theta 1 as a first preset angle, theta 2 as a second preset angle, and theta 3 as a third preset angle. In addition, a first/second/third preset distance and a first/second/third preset angle may be further provided on the basis of R1, R2, R3, θ 1, θ 2, and θ 2.
Further, in one embodiment, step S30 includes:
and when the distance is greater than or equal to zero and less than or equal to a first preset distance, determining that the color cast grade of the area to be detected is color cast-free.
In this embodiment, due to the influence of factors such as manufacturing process errors and optical environment, the actually measured screen body cannot reach a complete non-color-cast state, and in general, a slight color cast of the screen body is allowed, so that when the color coordinates (x, y) of the area to be measured on the CIE 1931 chromaticity coordinate diagram fall within the circle C1, the area to be measured is regarded as being non-color cast. Namely, when the distance is greater than or equal to zero and less than or equal to a first preset distance (namely, the rule 1 of color cast judgment and the like is met), determining that the color cast grade of the area to be detected is color cast-free.
Further, in an embodiment, step S30 includes:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is slightly reddish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is moderate reddish;
and when the distance is greater than the third preset distance and the included angle is greater than the first preset angle and less than the second preset angle, determining that the color cast grade of the area to be detected is severe red.
In this embodiment, when the distance D and the included angle θ satisfy the rule 2.1 of color cast judgment, it is determined that the color cast grade of the region to be measured is slightly reddish; when the distance D and the included angle theta meet the color cast judgment equal rule 2.2, determining that the color cast grade of the area to be detected is moderate red; and when the distance D and the included angle theta meet the color cast judgment equal rule of 2.3, determining that the color cast grade of the area to be measured is severe red.
Further, in one embodiment, step S30 includes:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be detected is slightly greenish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be detected is moderate green;
and when the distance is greater than the third preset distance, and the included angle is greater than the second preset angle and less than the third preset angle, determining that the color cast grade of the area to be measured is severe greenish.
In this embodiment, when the distance D and the included angle θ satisfy the rule of color cast judgment, such as 3.1, it is determined that the color cast grade of the region to be measured is slightly greenish; when the distance D and the included angle theta meet the color cast judgment rule 3.2, determining that the color cast grade of the area to be detected is moderate green; and when the distance D and the included angle theta meet the color cast judgment rule 3.3, determining that the color cast grade of the area to be detected is severe green.
Further, in one embodiment, step S30 includes:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, the included angle is greater than a third preset angle and less than 180 degrees, or the included angle is greater than-180 degrees and less than the first preset angle, determining that the color cast grade of the area to be detected is slightly bluish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the region to be detected is medium bluish;
and when the distance is greater than the third preset distance, and the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the area to be measured is heavily bluish.
In the embodiment, when the distance D and the included angle theta meet the color cast judgment rule of 4.1, the color cast grade of the area to be detected is determined to be slightly bluish; when the distance D and the included angle theta meet the color cast judgment rule 4.2, determining that the color cast grade of the area to be detected is moderate blue; and when the distance D and the included angle theta meet the color cast judgment equal rule of 4.3, determining that the color cast grade of the region to be measured is severe bluish.
Further, in an embodiment, the included angle θ between the connecting line of each point and the isoenergetic white light point E and the x axis on the CIE 1931 chromaticity coordinate diagram of the area to be measured 1 to 9 corresponding to the points P1 to P9 on the CIE 1931 chromaticity coordinate diagram, the color coordinates corresponding to the points, the distance D between each point and the isoenergetic white light point E, and the isoenergetic white light point E is shown in table 2:
Figure 284621DEST_PATH_IMAGE004
through the rules such as color cast judgment, the results of color cast judgment and the like of the areas 1-9 to be detected can be determined to be OK, namely no color cast exists.
Further, in an embodiment, referring to fig. 5, fig. 5 is a schematic diagram of a blue-emitting screen body in an embodiment. As shown in fig. 5, color coordinates of four regions to be measured on the bluing screen body in the CIE 1931 chromaticity coordinate diagram are P1 (0.228336, 0.236646), P2 (0.228894, 0.239925), P3 (0.22496, 0.230985) and P4 (0.231918, 0.242693), respectively. With the combination of the above steps S20 and the rules such as judgment, the information shown in table 3 is obtained by calculation:
Figure 929229DEST_PATH_IMAGE005
therefore, the results of judgment and the like obtained by the scheme of the embodiment are consistent with the actual situation, namely, the method for judging color cast and the like according to the scheme of the embodiment has high accuracy.
Fig. 6 is a schematic diagram of color cast judgment and the like according to the rectangular frame type card control method. As shown in fig. 6, the color gamut satisfies polar coordinate distribution, and does not satisfy rectangular coordinate distribution, for example, if the color gamut between OP1 and OP2 needs to be divided into a color cast type (e.g. red), according to the conventional rectangular frame type (as shown by the rectangular box on the figure), many small rectangles need to be divided inside the corresponding region to define the color gamut as full as possible, but no matter how subdivided, there will always be missing color gamut parts in the boundary region, and based on the clipping (combining distance and included angle) of the chromaticity circle in this embodiment, this problem is well avoided.
In a third aspect, an embodiment of the present invention further provides a device for color cast determination.
In an embodiment, referring to fig. 7, fig. 7 is a functional module schematic diagram of an embodiment of a color cast determination device according to the present invention. As shown in fig. 7, the color cast judging device includes:
the acquisition module 10 is configured to acquire a color coordinate point P of the area to be measured on a CIE 1931 chromaticity coordinate diagram;
the calculating module 20 is configured to calculate a distance between the color coordinate point P and the color coordinate point E on the CIE 1931 chromaticity coordinate diagram and an included angle between a connection line of the two points EP and an x axis on the CIE 1931 chromaticity coordinate diagram, based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram;
and the judging module 30 is used for determining the color cast grade of the area to be measured according to the distance and the included angle.
Further, in an embodiment, the module 30 is configured to:
and when the distance is greater than or equal to zero and less than or equal to a first preset distance, determining that the color cast grade of the area to be measured is color cast-free.
Further, in an embodiment, the module 30 is configured to:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is slightly reddish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is moderate reddish;
and when the distance is greater than the third preset distance and the included angle is greater than the first preset angle and less than the second preset angle, determining that the color cast grade of the area to be measured is severe reddish.
Further, in an embodiment, the module 30 is configured to:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be measured is slightly greenish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be detected is moderate green;
and when the distance is greater than the third preset distance, and the included angle is greater than the second preset angle and smaller than the third preset angle, determining that the color cast grade of the area to be detected is severe green.
Further, in an embodiment, the module 30 is configured to:
when the distance is larger than a first preset distance and smaller than or equal to a second preset distance, the included angle is larger than a third preset angle and smaller than 180 degrees, or the included angle is larger than-180 degrees and smaller than the first preset angle, determining that the color cast grade of the area to be detected is slightly bluish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the region to be detected is medium bluish;
and when the distance is greater than the third preset distance, and the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the area to be detected is heavily bluish.
The function implementation of each module in the device for color cast judgment and the like corresponds to each step in the method embodiments for color cast judgment and the like, and the function and implementation process are not described in detail herein.
In a fourth aspect, the embodiment of the present invention further provides a readable storage medium.
The readable storage medium of the present invention stores a program for color cast determination, wherein the program for color cast determination implements the steps of the method for color cast determination when executed by the processor.
The method implemented when the program such as color cast judgment is executed may refer to each embodiment of the method such as color cast judgment of the present invention, and details thereof are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims (10)

1. A method for color cast, etc., comprising:
acquiring a color coordinate point P of a region to be measured on a CIE 1931 chromaticity coordinate diagram;
calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram;
and determining the color cast grade of the area to be detected according to the distance and the included angle.
2. The method for color cast determination and the like according to claim 1, wherein the step of determining the color cast grade of the region to be measured according to the distance and the included angle comprises:
and when the distance is greater than or equal to zero and less than or equal to a first preset distance, determining that the color cast grade of the area to be detected is color cast-free.
3. The method for color cast determination and the like according to claim 1, wherein the step of determining the color cast grade of the region to be measured according to the distance and the included angle further comprises:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is slightly reddish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is moderate reddish;
and when the distance is greater than the third preset distance and the included angle is greater than the first preset angle and less than the second preset angle, determining that the color cast grade of the area to be detected is severe red.
4. The method for color cast determination and the like according to claim 1, wherein the step of determining the color cast grade of the region to be measured according to the distance and the included angle further comprises:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be detected is slightly greenish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a second preset angle and less than a third preset angle, determining that the color cast grade of the area to be measured is moderate green;
and when the distance is greater than the third preset distance, and the included angle is greater than the second preset angle and smaller than the third preset angle, determining that the color cast grade of the area to be detected is severe green.
5. The method for color cast determination and the like according to claim 1, wherein the step of determining the color cast grade of the region to be measured according to the distance and the included angle further comprises:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, the included angle is greater than a third preset angle and less than 180 degrees, or the included angle is greater than-180 degrees and less than the first preset angle, determining that the color cast grade of the area to be detected is slightly bluish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the region to be detected is medium bluish;
and when the distance is greater than the third preset distance, and the included angle is greater than a third preset angle and less than 180 degrees or the included angle is greater than-180 degrees and less than a first preset angle, determining that the color cast grade of the area to be detected is heavily bluish.
6. A color cast judgment device or the like, characterized by comprising:
the acquisition module is used for acquiring a color coordinate point P of the area to be measured on a CIE 1931 chromaticity coordinate diagram;
the calculation module is used for calculating the distance between the color coordinate point P and the color coordinate point E and the included angle between the connection line of the two points EP and the x axis on the CIE 1931 chromaticity coordinate diagram based on the color coordinate point P of the region to be measured on the CIE 1931 chromaticity coordinate diagram and the color coordinate point E of the isoenergetic white light on the CIE 1931 chromaticity coordinate diagram;
and the judging module is used for determining the color cast grade of the area to be detected according to the distance and the included angle.
7. The color cast judgment device according to claim 6, wherein the judgment module is configured to:
and when the distance is greater than or equal to zero and less than or equal to a first preset distance, determining that the color cast grade of the area to be detected is color cast-free.
8. The apparatus for color cast, etc. of claim 6, wherein the judging module is further configured to:
when the distance is greater than a first preset distance and less than or equal to a second preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be detected is slightly reddish;
when the distance is greater than the second preset distance and less than or equal to a third preset distance, and the included angle is greater than a first preset angle and less than a second preset angle, determining that the color cast grade of the area to be measured is moderate reddish;
and when the distance is greater than the third preset distance and the included angle is greater than the first preset angle and less than the second preset angle, determining that the color cast grade of the area to be measured is severe reddish.
9. A device for color cast or the like, comprising a processor, a memory, and a program for color cast or the like stored on the memory and executable by the processor, wherein the program for color cast or the like, when executed by the processor, implements the steps of the method for color cast or the like according to any of claims 1 to 5.
10. A readable storage medium, having a program for color shift determination stored thereon, wherein the program for color shift determination, when executed by a processor, implements the steps of the method for color shift determination according to any one of claims 1 to 5.
CN202210653478.9A 2022-06-10 2022-06-10 Method, device and equipment for judging color cast and readable storage medium Pending CN114739644A (en)

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