TWI640976B - Technique for color profiling of a display device - Google Patents

Abstract

The invention describes a method, a device, and a computer-readable storage medium for color configuration of a display device. The method includes applying a plurality of digital color values to a display device, wherein the digital color values are located in a high saturation region of an input color space, and measuring a plurality of physical color values output by the display device, the physical colors The value is associated with the applied digital color value. The method further includes generating a color profile of the display device by determining a mapping of the digital color value of the full input color space to the physical color value output by the display device based on the measured physical color value and based on the core mapping. The core mapping is a mapping of digital color values in a low-saturation region of an input color space to physical color values output by a reference display device, and the low-saturation region includes a low-saturation digital color value, which Included in the high saturation area.

Description

Technology for color arrangement of display device

FIELD OF THE INVENTION The present disclosure relates generally to color profiling of display devices. In particular, the present disclosure relates to a color configuration of a display device in order to generate color profile information of the display device. The technology can be implemented in one or more methods, devices, and computer-readable storage media.

BACKGROUND OF THE INVENTION The importance of display devices such as liquid crystal display (LCD) devices in modern life is still increasing. There are several cases in which the user can be surrounded by more than one display device. This may happen, for example, in a motor vehicle (e.g., a car) where a user can view multiple display devices simultaneously (e.g., behind a steering wheel, in a center console, and / or provided as a tablet).

In order to ensure a matching color representation on multiple display devices, and to generally ensure that a desired physical color is displayed on a particular display device, it is known to perform color configuration on the display device. During the color configuration, a plurality of digital color values are applied to the display device, and the relevant physical color values output by the display device are measured, for example, by a three-color source colorimeter. The data set (color profile data) representing the mapping between the input digital color value and the output physical color value is then stored in the memory of the display device, for example, in the form of an ICC profile, which may include a matrix And / or consult a data sheet (LUT). This information can be used later to apply the appropriate input digital color values to produce the desired output physical color value.

However, in order to obtain necessary information for generating a color profile (for example, at the end of a production process), in the known art, a large number of physical color values need to be measured for each configured display device. As a rule of thumb, the more colors you measure, the more accurate your color gamut mapping model will be. Since the configuration of the display device is usually performed as part of the production process of the display device, the time-consuming and complicated configuration process will reduce the performance of the entire production process.

Therefore, using a common configuration method, the display device configuration of the production line is either very time-consuming or not accurate enough.

SUMMARY OF THE INVENTION In view of the foregoing, there is a need for a technology for color configuration of a display device, in which the technology avoids one or more of the above disadvantages or other related problems.

According to a first aspect, a method for color configuration of a display device is proposed. The method includes applying a plurality of digital color values to a display device, wherein the digital color values are located in a high-saturation region of an input color space, and measuring a plurality of physical color values output by the display device, the physical color values and The applied digital color values are associated. The method further includes generating a color profile of the display device by determining a mapping of the digital color values of the full input color space to the physical color values output by the display device based on the measured physical color values and based on the core mapping. The core mapping is a mapping of the digital color values of the low-saturation region of the input color space to the physical color values output by the reference display device. The low-saturation digital color values include low-saturation digital color values that are not included in the high-saturation area.

The display device may include at least one of an LCD display device, an OLED display device, a CRT display device, and the like. The input color space may be, for example, an RGB color space, an HSV color space, or an HSL color space. The plurality of digital color values may correspond to the digital color values that cause a physical color value to be displayed in an edge region of a color gamut of each display device represented in an x-y plane (CIE-xyY or CIE-Yxy) of the CIE1931 color space. The edge region of the color gamut may be defined as a region whose distance from the outer edge of the color gamut of the display device is less than a predetermined threshold. Multiple physical color values can be measured by a tri-color source colorimeter or any other suitable color measuring device. The physical color value can be expressed as a color value in the xyY color space. More precisely, the physical color value can be expressed as a color value in the x-y plane of the xyY color space. In addition, to describe the measured physical color value, any other suitable color space can be used, such as the CIE 1931 XYZ color space, the CIELab color space, or any other suitable color space.

The meaning of the expression “mapping” according to the present disclosure may be understood such that each of a plurality of input digital color values is explicitly associated with an output physical color value of a corresponding display device. To this end, the color feature data may include at least one of a transformation matrix, a file, a lookup table (LUT), and an ICC configuration file. For example, the full input color space can be represented, for example, by a full RGB color space including the values of R, G, and B, each with an interval of [0,1] ([0%, 100%]), or each with an interval of [0, 255] (for 24-bit color representation). Additionally or alternatively, the full input color space may be represented, for example, by the full HSV color space, which includes values of H at intervals [0 °, 360 °], and each interval at [0, 1] The values of S and V. Additionally or alternatively, the full input color space may be represented, for example, by the full HSV color space, which includes values of H at intervals [0 °, 360 °], and each interval at [0, 1] The values of S and L. Those skilled in the art know that color values can be explicitly converted between RGB, HSV and HSL representations. For example, there are clear transformation rules between the RGB color space and the HSV color space.

The core mapping may be represented by a color profile and / or profile data. The core map can be read from the memory of the device executing the method. For example, the core mapping can be represented by a lookup table (LUT) or a transformation matrix. The low-saturation region may be composed of (or may be represented by) digital color values that cause display in a core region of a color gamut of each display device represented in an xy plane (CIE-xyY) of an xyY color space. Physical color value. The core area of the color gamut may be defined as an area whose distance from the outer edge of the color gamut of the display device is greater than a predetermined threshold. Alternatively, the core area of the color gamut may be defined as an area whose distance from the white point of the color gamut of the display device is greater than a predetermined threshold.

The low-saturation area includes at least one area whose low-saturation digital color value is more than zero, and the low-saturation digital color value is not included in the high-saturation area. For example, the low-saturation region and the high-saturation region may be mutually exclusive, so that each possible digital color value belongs to the low-saturation region or the high-saturation region. For example, a digital color value with a saturation value up to a specific threshold may belong to a low saturation region, and a digital color value above a specific threshold may belong to a high saturation region. However, there may also be overlapping areas of low-saturation regions and high-saturation regions.

The method may further include performing application, measurement, and generation steps on each of a plurality of display devices of a group of display devices.

The set of display devices may correspond to the same batch of the production line of the display device. The set of display devices may also be a subset of the same batch of the production line, or may include display devices of different batches.

The method may further include applying a plurality of digital color values to a reference display device, wherein the digital color values are located in the low-saturation region of the input color space, and measuring a plurality of physical values output by the reference display device. A color value, the physical color value being associated with an applied digital color value, and determining a digital color value of the low-saturation region of the input color space based on the measured physical color value of the reference display device Core mapping to physical color values output by the reference display device.

For example, the reference display device may be a display device in the group of display devices. For example, the reference display device may be arbitrarily selected from a group of display devices. The reference display device may be a display device of the same lot as the display device. Alternatively, the reference display device may be a display device of another batch from a different batch from the display device. The digital color value applied to the reference display device may be selected such that each RGB color is applied to the reference display device in a predefined low-saturation region, that is, (100, 100, 100), (100, 100, 101), (100, 100, 102), etc. Alternatively, the digital color values applied to the reference display device may have a predetermined interval (with respect to the input color space) from each other, so that only a subset of the predefined color values in the low-saturation region is applied to the reference Display devices, such as (100, 100, 100), (100, 100, 110), (100, 100, 120), etc.

The number of digital color values applied to the display device may be less than the number of digital color values applied to the reference display device.

For example, the number of digital color values applied to the display device may be 3 or 6. The number of digital color values applied to the reference display device may be greater than 100 or greater than 1000.

Measuring the plurality of physical color values output by the display device may include simultaneously outputting and measuring at least two of the plurality of physical color values by using different regions of the display device.

Similarly, measuring a plurality of physical color values output by the reference display device may include simultaneously outputting and measuring at least two of the plurality of physical color values by using different regions of the reference display device.

Different areas of the display device and / or different areas of the reference display device may be represented as "color blocks" in different areas of the display area of each display device / reference display device. Different regions may be represented by multiple pixels of a display device and / or a reference display device. For each different area, a colorimeter (tristimulus colorimeter) can be used to measure the corresponding physical color value. Additionally or alternatively, an equivalent measurement system may be used. The measurement system may be able to measure multiple color values at once (such as a camera system with a software product that will calculate physical color values based on the color patches taken).

A high-saturation region may be defined as being composed of digital color values having a degree of saturation value above a first saturation threshold.

A low saturation region may be defined as being composed of digital color values having a saturation value below a second saturation threshold.

The first threshold value and the second threshold value may be the same saturation value or different saturation values. In any case, the saturation value can be expressed as a saturation value in the HSV color space or the HSL color space. However, saturation values can be derived from the RGB color space representation by using known transformation algorithms.

In the case where the input color space is an RGB color space using (R, G, B) vectors, a high-saturation region can be defined as consisting of digital color values, where the R value, G value, and B value of each digital color value Below the first RGB threshold.

In addition, a low-saturation region may be defined as being composed of digital color values, where the R value, G value, and B value of each digital color value are higher than the second RGB threshold.

The first RGB threshold and the second RGB threshold may be the same value or may be different values. For example, both the first RGB threshold and the second RGB threshold may be 30 (represented by a 24-bit color).

The plurality of digital color values located in a high-saturation region of the input color space may include at least one digital color value having a maximum saturation value.

This digital color value with the maximum saturation value can correspond to, for example, the basic colors in the RGB representation (ie (255, 0, 0) (red), (0, 255, 0) (green), and (0, 0, 255) (blue)). For example, all three of the above-mentioned basic colors in the RGB representation can be applied to a display device (continuously or simultaneously). The value of the maximum saturation may correspond to, for example, a saturation value (S) of 1 in the HSV or HSL color space.

The method may further include storing the color profile data in a memory of the display device. The color characteristic data may be stored, for example, in the form of an ICC profile. ICC profiles can include matrices and / or look-up tables (LUTs).

This group of display devices may be composed of display devices of the same model and manufacturer.

This group of display devices may be composed of display devices of the same batch in a production line.

The core mapping may include a first transformation matrix, and the profile information may include a second transformation matrix.

The first conversion matrix may be a 3 × 3 matrix for converting an RGB color value (a vector having 3 dimensions) into an xyY color value (a vector having 3 dimensions). The color profile data can be represented by a second transformation matrix. The second transformation matrix may include a multiplication of the transformation matrix and the first transformation matrix. The transformation matrix may include a rotation matrix and / or a matrix for affine transformation.

The second transformation matrix may include a rotation matrix. The rotation matrix can define rotations in the x-y plane of the xyY color space.

The display device may be configured for use in a motor vehicle. For example, the display device may be used as an instrument display behind a steering wheel of a motor vehicle, as a navigation display in a center console of a motor vehicle, and / or as a display device configured as a tablet computer for a motor vehicle.

According to a second aspect, a computer program product is provided. The computer program product includes a computer program code portion, and the method and method steps of the present invention are implemented when the computer program product is executed by one or more processors.

The one or more processors may be located on a single network node or may be included in a distributed computing system. The computer program product can be stored on a computer-readable storage medium such as a semiconductor memory, a DVD-ROM, a CD-ROM, and the like. A computer program product can also be provided for download via a communication connection.

According to a third aspect, a device for color configuration of a display device is provided. The device includes a memory and a processor. The memory stores a computer program capable of running on the processor, and the processor executes The computer program can realize the method and method steps of the present invention. The apparatus of the third aspect may also be configured to perform any of the methods and method steps described in the present invention.

The details described above with regard to the first aspect may also apply to the second and / or third aspect.

Fig. 1 shows a situation in which a plurality of display devices 2 are visible to a user. The example of FIG. 1 shows the cockpit of a car in which two display devices 2 are fixed on the dashboard 4 of the car. The other display device 2 is a display device of a mobile tablet computer 6, wherein the tablet computer 6 can be used to control certain functions of a car or to watch media content such as pictures or videos. The situation shown in FIG. 1 exemplifies the necessity of color management. By using color management, it can be ensured that the correct digital color input value is input into various display devices 2 so that one and the same physical color (or almost one and the same physical color) is displayed (ie, output) through the various display devices 2 . For example, by using color management, videos displayed simultaneously on the display device 2 of the mobile tablet computer 6 and one of the fixed display devices 2 should be displayed on the two display devices 2 in the same or almost the same physical color. As another example, UI elements (user interface elements), such as icons or visual indicators, should be displayed on all display devices 2 with the same or almost the same physical color value.

In order to perform such color management, it is necessary to arrange each display device 2 in advance. In other words, it is necessary to know or at least estimate to which physical color value the corresponding display device 2 "maps" the corresponding input digital color value. The result of this configuration may be stored, for example, in the form of a color profile (eg, an ICC profile) on the memory of the corresponding display device 2. Several formats of this color configuration are well known, for example, a 3 × 3 matrix can be used, which converts a three-dimensional RGB vector into a three-dimensional xyY vector. Several other suitable color spaces can be used instead of the RGB color space and the xyY color space. Between these color spaces, explicit conversion rules are known. For example, an HSV or HSL color space may be used instead of the RGB color space. In addition, CIELab, CIEL * a * b *, or any other suitable color space can be used instead of the xyY color space. As an alternative to the matrix, the color profile can also be represented by a look-up table (LUT), where the table maps each input digital color value to the associated output physical color value.

Once the correspondence between the input digital color value and the output physical color value of each display device is known, the information (color profile data) can be used to display the required physical color value.

It should be understood that in addition to the case shown in FIG. 1, there are several cases where it is desirable to use color management, for example, in order to achieve a uniform color impression among a plurality of display devices 2. For example, in photo retouching or graphic design, it is important that the display device used displays "correct" colors.

FIG. 2 shows a flowchart of a method for color configuration of a display device according to the present disclosure.

In a first step 10, a plurality of digital color values are applied to a display device, wherein the digital color values are located in a high-saturation region of the input color space. The display device is a display device to be configured, and may correspond to one of the display devices 2 shown in FIG. 1.

In a second step 12, a plurality of physical color values output by the display device are measured. The physical color value is associated with the applied digital color value.

In the third step 14, the color profile data of the display device is generated by determining the mapping of the digital color value of the full input color space to the physical color value output by the display device based on the measured physical color value and based on the core mapping. .

The core mapping is a mapping of the digital color values of the low-saturation regions of the input color space to the physical color values output by the reference display device, such as from the same production batch, and the low-saturation regions include low-saturation digital color values The low-saturation digital color values are not included in the high-saturation region.

In the following, with reference to FIG. 3, a device 20 that can be used to perform the above method of FIG. 2 is described. FIG. 3 shows a block diagram of a device 20 for a color configuration of a display device according to the present disclosure. The device 20 includes a memory 22 and a processor 24, where the memory 22 and the processor 24 are logically connected such that the processor 24 is configured to perform a method based on instructions stored in the memory 22. The memory 22 may include volatile and / or non-volatile memory, and may include, for example, one or more of HDD, SDD, RAM, ROM, magnetic storage devices, solid-state storage devices, and optical storage devices. The processor 24 may include, for example, a single CPU or multiple processors configured to execute the method according to instructions stored in the memory 22. The memory 22 and the processor 24 are not necessarily physically located on the same or the same device, but may be distributed on multiple devices and logically connected through corresponding data interfaces. In addition, the device 20 for color configuration of the display device may be implemented by a cloud computing device.

In the memory 22 storing the instructions, when the instructions are executed, the processor 24 is instructed to perform the following steps:

-Applying multiple digital color values to a display device, where the digital color values are located in a high saturation region of the input color space;

-Measuring a plurality of physical color values output by the display device, the physical color values being associated with applied digital color values; and

-Generate the color profile information of the display device by determining the mapping of the digital color value of the full input color space to the physical color value output by the display device based on the measured physical color value and based on the core mapping.

The core mapping is a mapping of digital color values in a low-saturation region of an input color space to physical color values output by a reference display device, and the low-saturation region includes a low-saturation digital color value, which is not Included in the high saturation area.

To apply digital color values to one or more display devices, the device 20 includes a digital color output interface 26. Through the digital color output interface 26, digital color values can be applied to a display device, for example, by using a cable and a suitable connector. As the connector, for example, a VGA, DVI or HDMI connector or any other suitable connector can be used.

To measure the physical color value, the device 20 includes a measurement interface 28. A colorimeter (eg, a three-color source colorimeter) may be used to measure physical color values and provide these values to the device 20 through a measurement interface 28.

The device 20 further includes a color profile output interface 30, through which the generated color profile data can be output to a corresponding display device, so that the color profile data can be stored in the memory of the display device Body. However, the color profile output interface 30 may further include an interface through which the generated color profile data may be transmitted to a centralized database (for example, a database available via the Internet), and if necessary, may be downloaded from It is read or downloaded by a centralized database.

FIG. 4 shows two different color gamuts 40 and 42, each of which belongs to a corresponding display device. The representation of Figure 4 shows the x-y plane of the xyY color space. In other words, FIG. 4 shows a CIE 1931 chromaticity diagram in which the color gamut of all visible chromaticities is represented by a tongue-shaped graphic 44. In the tongue-shaped graphic 44, different display devices are capable of displaying a subset of chromaticity values, where the subset is referred to as the "color gamut" or "color range" of the corresponding display device.

Those skilled in the art will understand that there are several possibilities for color representation in different color spaces. For example, the color gamuts 40 and 42 can also be expressed in Lab color space (CIELAB), where the L * value represents the brightness of the color, and the a * and b * values represent the chromaticity of a certain color. In this case, the representation of FIG. 4 lies in the a * -b * plane of the color space. Another example of a color space that can be used is the CIE 1976 (L *, u *, v *) color space (CIELUV). Between these color spaces, there are clear conversion rules that allow technicians to easily convert physical color values from one color space to another.

As shown in FIG. 4, different display devices can physically display different color ranges (so-called color gamuts 40, 42) in the chromaticity plane (eg, x-y plane) of the color space under consideration. The physical colors that can be displayed by a particular display device may be limited by the quality and amount of pixel colors used to generate the color impression of the corresponding display device. For example, in the case where the display device under consideration has pixels for displaying red, green, and blue, the obtained color gamuts can be triangles as shown in color gamuts 40 and 42 in FIG. 4 (for specific Brightness value). In this case, all colors, that is, all chromaticity values within the corresponding shape of the color gamuts 40, 42 can be physically displayed by the corresponding display device.

The color gamut of the display device under consideration strongly depends on the quality of the display device and / or the technology used (amount of pixel color, LCD / CRT / OLED, etc.). However, in display devices of the same and the same batch production line, there will be a slight change between the color gamuts 40, 42 of the display device. Therefore, in most cases, it cannot be assumed that all display devices in the same batch of display devices ("a set of display devices" according to the present disclosure) of a production line have the same color gamut. However, as shown in FIG. 4, it can be assumed that the display devices of the same batch (ie, the display devices in a group of display devices) are all capable of displaying colors within a specific core color gamut 46.

Since the core color gamut 46 is included in the color gamuts 40, 42 of all the display devices of the group of display devices, it is not necessary to perform the physical color value within the core color gamut 46 for each display device in the group of display devices. Detailed configuration. According to the techniques described herein, it is sufficient to measure the core color gamut 46 only once for a group of display devices. Alternatively, information about the core color gamut 46 may also be collected from a database in which the information is stored as a core color gamut for a particular type of display device. Alternatively, the measured core color gamut of an earlier batch of the production line may be used.

However, as shown in FIG. 4, the edge regions of the respective color gamuts 40, 42 may be different from each other. Therefore, for each display device, at least these edge regions need to be individually measured and configured.

The physical color value of the core color gamut 46 corresponds to a color value having a low saturation. These physical color values are located near the white point (WP). In contrast to these physical color values with low saturation, the physical color values of the edge regions of color gamuts 40 and 42 correspond to color values with high saturation.

Therefore, the physical color value of the core color gamut 46 corresponds to an input digital color value having a low saturation value. The physical color values of the edge regions of the color gamuts 40 and 42 correspond to the input digital color values having a high saturation value.

For example, an input digital color value with a low saturation value may correspond to a (R, G, B) value, where each of the (R, G, B) values has an R value, each of the G value and the B value is higher than A predetermined RGB threshold (for example, 30 in a 24-bit color representation).

In addition, the saturation value of the input digital color value can be exported, for example, from the corresponding digital color value in the HSV or HSL representation, where the S value corresponds to the saturation value. The S value is usually in the range between 0 and 1, that is, in the range between 0% and 100%. For example, between the RGB representation of a digital color value and the HSV or HSL representation of the same digital color value, there are explicit transformation rules known to those skilled in the art. Therefore, in a case where digital color values are expressed in the RGB color space, for example, the saturation value S may be assigned to each digital color value.

Therefore, the core color gamut 46 may be formed by an input digital color value having a saturation value S below a predetermined saturation threshold. Similarly, the edge regions of the color gamuts 40 and 42 may be formed of input digital color values having a saturation value S above a predetermined saturation threshold.

According to an embodiment of the present disclosure, first, the core color gamut 46 is measured by using a reference display device. For example, the reference display device may be a display device in the batch display device to be configured (for example, arbitrarily selected). Alternatively, information about the core color gamut 46 may be derived from a database. The information about the core color gamut 46 corresponds to a core mapping in which each of a plurality of input digital color values of a low-saturation region of the input color space is mapped to a corresponding output physical color value within the core color gamut 46.

When measuring the core color gamut 46, determine the core mapping by applying multiple input digital color values (for example, more than 100, more than 1000, or more than 10,000) to a reference display device, and measure the corresponding output physical color value, And based on the measured physical color value, a data structure (for example, a matrix or a lookup table) describing the mapping between the input digital color value and the output physical color value is generated. The input digital color value for this measurement of the core color gamut 46 is the digital color value of the low saturation region of the input color space.

Secondly, a plurality of predefined input digital color values of a high-saturation region of the input color space are applied to the first display device to be measured. These predefined input digital color values cause the first display device to display the physical color value 48 represented as a black star in the graph of FIG. 4. For example, you can use fully saturated color values from the input color space. For example, the input digital color value of a high-saturation region can include three RGB values (0, 0, 255), (0, 255, 0), and (255, 0, 0). Additionally or alternatively, the input digital color value of the high-saturation region may include three RGB values (0, 255, 255), (255, 0, 255), and (255, 255, 0). In some embodiments, the predefined input digital color values are selected such that they meet predefined rules, such as R + G = 255 B = 0, B + G = 255 R = 0, and / or R + B = 255 G = 0. The corresponding output physical color value is measured by using a suitable measuring device (for example, a three-color source colorimeter).

Based on the measurement results of the high-saturation area, and based on the information about the core color gamut 46 in the low-saturation area, the color gamut 40 may be determined for the first display device. In other words, the mapping between the full input color space and the individual output physical color values can be determined. Based on this mapping, color profile data is generated, for example, in the form of a matrix or lookup table (LUT). One possibility for determining the color profile is given below with reference to Figs. 5, 6a and 6b.

Similar to the measurement of the first display device, the color profile data of the second display device can be generated, where the corresponding color gamut 42 of the second display device is indicated by the dashed line in FIG. 4. In addition, the physical color value 50 generated by applying the input digital color value in the high-saturation region of the second display device is shown as a dotted line in the graph of FIG. 4.

By using the above method, it is possible to configure a plurality of display devices in a group of display devices (for example, the same batch of a production line) significantly faster than if each display device is individually and completely configured. For each display device in this group of display devices, the core mapping of the low-saturation area only needs to be analyzed once (by using a reference display device, the reference display device can be obtained from a group of display devices), and only a limited number of measurements are required High saturation color value.

Referring to FIG. 5, FIG. 6a and FIG. 6b, an exemplary embodiment of generating color profile data according to the present disclosure is described. The examples shown in Figs. 5, 6a and 6b are based on the principle described above with reference to Fig. 4. Therefore, the above description of FIG. 4 is also applicable to the examples of FIGS. 5, 6 a, and 6 b.

FIG. 5 shows a representation of physical color values in an x-y plane similar to the representation of FIG. 4. A core color gamut 46 is shown, the corners of which correspond to (0, 0, 240), (0, 240, 0) and (240, 0, 0) (in RGB color space) digital input color values . In addition, the position of the white point (WP) in the physical color space (x-y plane) is determined by measuring the physical color value (255, 255, 255) corresponding to the digital color value.

The color gamut 40 of the display device to be measured is indicated by a dotted line. For example, the position and shape of the color gamut 40 is determined by measuring the input color values (0, 0, 255), (0, 255, 0) and (255, 0, 0). As shown in FIG. 5, the shape of the color gamut 40 is rotated by an angle δ with respect to the core color gamut 46.

In FIG. 6a, a mathematical operation is shown, describing how to determine the color profile data of the entire input color space for the display device with respect to the situation shown in FIG. The upper part of Fig. 6a shows the color profile data in the form of a core matrix 60. In other words, the core matrix 60 represents inputting digital color values in the RGB color space (as (R, G, B) vector 62) to output physical color values in the xyY color space (as (x, y, Y) vector 64) ) The core mapping. The core matrix 60 is a 3 × 3 matrix including nine elements a11 to a33.

By comparing the shape of the core color gamut 46 and the corner points of the color gamut 40 of the display device to be measured, the angle δ can be determined. The position of the white point can be known from the core map and has coordinates x _WP and y _WP in the xy plane. As shown in the lower part of FIG. 6 a, the core color gamut 46 is rotated around the white point WP by an angle δ by multiplying the core matrix 60 by the conversion matrix M (δ) 66. For clarity, the transformation matrix 66 is shown as three separate matrices, which can be multiplied to generate a 3 × 3 transformation matrix.

In addition, the multiplication of the matrices 66 and 60 corresponds to the final conversion matrix 70 of the display device for configuration. Such a final conversion matrix 70 is shown in the left part of Fig. 6b. This final transformation matrix 70 can be represented as one transformation matrix having nine elements b11 to b33 by performing matrix multiplication of the matrices 66 and 60. In other words, the color profile data of the display device is represented by the multiplication of the conversion matrix 66 and the core matrix 60. By using the color distribution data (represented by the final transformation matrix 70), for each input (R, G, B) value, the corresponding physical color value (x ', y', Y ') can be derived, as shown on the left side of Figure 6b section.

As an alternative to the final conversion matrix 70, a lookup table (LUT) 72 may also be generated based on the core mapping and based on the measured physical color values of the display device to be configured. In the above example described with reference to Fig. 6a, the equation shown in the lower part of Fig. 6a can be solved by using multiple predefined (R, G, B) vectors or multiple predefined (x ', y', Y ') vectors. To generate a lookup table 72.

Thus, Fig. 6b shows two examples of color profile data according to the present disclosure. In the left part is the conversion matrix 70 and in the right part is the lookup table 72.

The color profile data may be stored in the memory of the display device in the form of a matrix 70 and / or a look-up table (LUT) 72 as the color profile data. In addition, the color profile data may be stored in a database, which is available, for example, through the Internet.

FIG. 7 illustrates how multiple physical physical values of the display device 2 can be measured simultaneously. Therefore, a plurality of measuring devices 60 are provided, each measuring device 60 measures a physical color value in a predetermined area of the display device 2. In these predefined areas, different colors are shown, for example, in the form of color patches as shown in FIG. 7. In other words, different digital input color values are applied to different regions of the display device 2 at the same time. The generated physical color value is measured by a plurality of measurement devices 60. This method can be used for both the configuration of the reference display and the configuration of the display device to be configured. By using the technique shown in FIG. 7, the total time for configuring the display device can be greatly reduced.

2‧‧‧ display device
4‧‧‧ Dashboard
6‧‧‧mobile tablet
10‧‧‧ the first step
12‧‧‧Second step
14‧‧‧ third step
20‧‧‧ device
22‧‧‧Memory
24‧‧‧ processor
26, 28, 30‧‧‧ interface
40, 42‧‧‧ color gamut
44‧‧‧ Tongue Shape
46‧‧‧Core Color Gamut
48, 50‧‧‧ physical color value

60‧‧‧ Core Matrix

62, 64‧‧‧ vector

66‧‧‧ Transformation Matrix

70‧‧‧ final conversion matrix

72‧‧‧View Data Sheet

δ‧‧‧ angle

An embodiment of the technology given herein is described below with reference to the drawings, in which: FIG. 1 shows a schematic diagram regarding the condition of a motor vehicle, in which a plurality of display devices are visible to a user; FIG. 2 shows a display according to the present disclosure; A schematic diagram of a method for color configuration of a display device; FIG. 3 illustrates a schematic diagram of a device for color configuration of a display device according to the present disclosure; FIG. 4 illustrates a core color gamut and two different displays of one batch Color gamut of the device; Figure 5 shows an example of the core color gamut and full color gamut of the display device and the corresponding rotation angle; Figure 6a shows an example of generating color profile data by using a matrix; Figure 6b shows an example based on Two examples of color profile data (matrix and look-up table) of the present disclosure; and FIG. 7 illustrates a manner of measuring multiple physical color values of a display device simultaneously.

Claims (16)

A method for color configuration of a display device, comprising: applying a plurality of digital color values to a display device, wherein the digital color values are located in a high-saturation region of an input color space; and measuring a plurality of output from the display device. A physical color value that is associated with the applied digital color value; and by determining the digital color value of the full input color space to the physical color output by the display device based on the measured physical color value and based on the core mapping Value mapping to generate color profile data of the display device, wherein the core mapping is a mapping of digital color values of a low-saturation region of the input color space to physical color values output by a reference display device, and The low-saturation digital color value includes a low-saturation digital color value, and the low-saturation digital color value is not included in the high-saturation digital value. The method of claim 1, further comprising: performing the applying, measuring, and generating steps on each of a plurality of display devices of a group of display devices. The method according to claim 1 or 2, further comprising: applying a plurality of digital color values to a reference display device, wherein the digital color values are located in the low-saturation region of the input color space; and measuring the A reference to a plurality of physical color values output by the display device, the physical color values being associated with an applied digital color value; and determining the low of the input color space based on the measured physical color values of the reference display device Core mapping of the digital color values of the saturation region to the physical color values output by the reference display device. The method of claim 3, wherein the number of the digital color values applied to the display device is smaller than the number of the digital color values applied to the reference display device. The method according to claim 1 or 2, wherein measuring a plurality of physical color values output by the display device includes simultaneously outputting and measuring a plurality of the plurality of physical color values by using different regions of the display device. At least two. The method of claim 1 or 2, wherein the high-saturation region is defined as being composed of digital color values having a saturation value above a first saturation threshold. The method of claim 1 or 2, wherein the low saturation region is defined as consisting of a digital color value having a saturation value below a second saturation threshold. The method of claim 1 or 2, wherein the plurality of digital color values located in the high-saturation region of the input color space include at least one digital color value having a maximum saturation value. The method according to claim 1 or 2, further comprising: storing the color profile data in a memory of the display device. The method of claim 2, wherein the set of display devices consists of display devices of the same model and manufacturer. The method of claim 2, wherein the set of display devices is composed of display devices of the same batch of a production line. The method according to claim 1 or 2, wherein the core mapping comprises a first transformation matrix, and wherein the color profile data comprises a second transformation matrix. The method of claim 12, wherein the second transformation matrix comprises a rotation matrix. Method according to claim 1 or 2, wherein the display device is configured for a motor vehicle. A computer program product including a computer program code portion, which when executed by one or more processors, implements the steps of the method according to any one of claims 1-14. A device for color configuration of a display device, the device is configured to: apply a plurality of digital color values to a display device, wherein the digital color values are located in a high saturation region of an input color space; and measure the display device Output a plurality of physical color values, the physical color values being associated with the applied digital color values; and by determining the digital color values of the full input color space to the display device based on the measured physical color values and based on the core mapping Mapping of output physical color values to generate color profile data of the display device, wherein the core mapping is a digital color value of a low-saturation region of the input color space to a physical color value output by a reference display device And wherein the low-saturation area includes a low-saturation digital color value, and the low-saturation digital color value is not included in the high-saturation area.