CN109979382A - Imaging system color correcting method and system under screen based on screen transmitted spectrum - Google Patents

Abstract

The invention discloses a color correction method and system for an imaging system under the screen based on the transmission spectrum of the screen, which mainly aims at correcting the color cast problem of the collected images when the imaging system under the screen is used for imaging under the screen through the screen. The method includes the following steps: firstly obtaining the distribution of the transmittance of the screen sample with the wavelength; generating an initial compensation matrix according to the distribution to compensate the under-screen imaging system; performing an imaging test on the compensated and corrected under-screen imaging system and acquiring a test image ; Correct the compensation matrix according to the test image, and use the corrected compensation matrix to compensate for the color cast of the under-screen imaging system; finally, continuously correct the compensation matrix according to the test results until the color cast is further weakened and meets the needs of use, and the under-screen imaging system color cast is corrected. The method can enable the under-screen imaging system to perform chromatic aberration-free imaging of objects at infinity, especially the under-screen imaging of the front camera of a mobile device.

Description

Color correction method and system for under-screen imaging system based on screen transmission spectrum

technical field

The invention relates to the technical field of image processing, in particular to a color correction method and system for an imaging system under a screen based on a screen transmission spectrum.

Background technique

For the under-screen imaging system, since the OLED (Organic Light Emitting Diode) screen is a multi-layer display device made of transparent materials with a certain transmittance, when the under-screen imaging is performed through the OLED screen, due to the incident incident The transmittance of each band of light in the white light of the under-screen imaging system is different in the OLED screen, which leads to the color distortion of the obtained image compared to the target scene when the under-screen imaging system is used to capture images. To solve this problem, it is necessary to correct the color calibration of the imaging system under the screen.

The current domestic commercial camera calibration method is based on D65 light source and reflective standard color plate. The method utilizes the imaging result of the imaging system to be calibrated and the RGB (standard industrial color mode) value of the corresponding color block in the standard color card to establish a corresponding relationship, thereby completing the calibration. At the same time, there are different color calibration methods for different digital imaging systems. For example, a multispectral camera color correction method, for satellite multispectral cameras, using the uniform illumination generated by the integrating sphere light source to compare the image of the standard color card color block with the real results of the standard color card color block, and complete the remote sensing multispectral camera for spaceflight. However, this method is not suitable for pipeline production and calibration scenarios, so it is necessary to propose a color correction for the imaging system under the OLED screen of the portable electronic device.

SUMMARY OF THE INVENTION

The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

To this end, an object of the present invention is to propose a color correction method for an imaging system under a screen based on a screen transmission spectrum.

Another object of the present invention is to propose a color correction system for an imaging system under the screen based on the screen transmission spectrum.

In order to achieve the above object, one aspect of the present invention proposes a color correction method for an imaging system under the screen based on the screen transmission spectrum, which includes the following steps: step S1, using a spectrometer to obtain the transmittance curve of the OLED screen sample; step S2, according to the transmittance The curve determines the initial compensation matrix of the OLED screen sample; step S3, using the initial compensation matrix to pre-calibrate the imaging system under the screen; step S4, using the pre-calibrated imaging system under the screen to take a photo test on the standard color card, Obtain the RGB three-channel test value of the corresponding area in the test result; Step S5, compare the RGB three-channel test value of the corresponding area with the color standard value in the standard card to determine a compensation matrix; Step S6, use the compensation The matrix calibrates the imaging system under the screen, and performs an imaging test on the standard color card to determine whether there is a color cast phenomenon. If there is, repeat the steps S4-S6, and if not, output the compensation result.

The color correction method of the under-screen imaging system based on the screen transmission spectrum of the embodiment of the present invention uses the screen sample transmission spectrum obtained by the spectrometer and pre-calibrates the under-screen imaging system according to the spectrum, and then uses the pre-calibrated system to calibrate the standard color card. Perform the shooting test to obtain the average calibration value, calculate the compensation matrix, and continuously correct the compensation matrix according to the test results, so as to correct the color cast phenomenon of the under-screen imaging system, especially for under-screen imaging with the front camera of a mobile phone or other mobile device, Color correction for OLED under-screen imaging systems for pipeline production and calibration scenarios and portable electronics.

In addition, the color correction method for the under-screen imaging system based on the screen transmission spectrum according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

Further, in an embodiment of the present invention, the step S1 further includes: using a transmission spectrometer to measure the OLED screen sample to obtain transmittance curves at different wavelengths.

Further, in an embodiment of the present invention, in the step S2, the average transmittance is obtained by calculating the transmittance curve to determine the initial compensation matrix of the OLED screen sample, wherein the The initial compensation matrix is for three channels of RGB.

Further, in an embodiment of the present invention, the pre-calibration relationship between the RGB of the pre-calibrated under-screen imaging system and the RGB of the OLED screen sample is:

Wherein, R, G, B represent the three channels of the OLED screen sample, C _{0, 3×3} represent the initial compensation matrix, R ₀ , G ₀ , B ₀ represent the pre-calibrated under-screen imaging system of three channels.

Further, in an embodiment of the present invention, in the step S4, if the standard color card is used as the test target, only the first three rows of color blocks need to be selected for data collection processing.

In order to achieve the above object, another aspect of the present invention proposes a color correction system for an imaging system under the screen based on the screen transmission spectrum, comprising: an acquisition module for acquiring the transmittance curve of an OLED screen sample by using a spectrometer; an initialization module for The transmittance curve determines the initial compensation matrix of the OLED screen sample; the pre-calibration module is used to pre-calibrate the under-screen imaging system using the initial compensation matrix; the test module is used to use the pre-calibrated under-screen imaging system to calibrate the standard The color card performs a photo test, and obtains the RGB three-channel test value of the corresponding area in the test result; the comparison module is used to compare the RGB three-channel test value of the corresponding area with the color standard value in the standard card to determine a compensation matrix; The judging module is used for calibrating the under-screen imaging system by using the compensation matrix, and performing an imaging test on the standard color card to judge whether there is a color cast phenomenon, and if not, output a compensation result.

The color correction system of the under-screen imaging system based on the screen transmission spectrum according to the embodiment of the present invention pre-calibrates the under-screen imaging system according to the transmission spectrum of the screen sample obtained by the spectrometer, and then uses the pre-calibrated system to calibrate the standard color chart Perform the shooting test to obtain the average calibration value, calculate the compensation matrix, and continuously correct the compensation matrix according to the test results, so as to correct the color cast phenomenon of the under-screen imaging system, especially for under-screen imaging with the front camera of a mobile phone or other mobile device, Color correction for OLED under-screen imaging systems for pipeline production and calibration scenarios and portable electronics.

In addition, the color correction system for the under-screen imaging system based on the screen transmission spectrum according to the above-mentioned embodiments of the present invention may also have the following additional technical features:

Further, in an embodiment of the present invention, the acquisition module further includes: using a transmission spectrometer to measure the OLED screen sample to acquire transmittance curves at different wavelengths.

Further, in an embodiment of the present invention, in the initialization module, the average transmittance is obtained by calculating the transmittance curve to determine the initial compensation matrix of the OLED screen sample, wherein the The initial compensation matrix is for three channels of RGB.

Further, in an embodiment of the present invention, the pre-calibration relationship between the RGB of the pre-calibrated under-screen imaging system and the RGB of the OLED screen sample is:

Wherein, R, G, B represent the three channels of the OLED screen sample, C _{0, 3×3} represent the initial compensation matrix, R ₀ , G ₀ , B ₀ represent the pre-calibrated under-screen imaging system of three channels.

Further, in an embodiment of the present invention, in the test module, if the standard color card is used as the test target, only the first three rows of color blocks need to be selected for data acquisition and processing.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

1 is a flowchart of a color correction method for an under-screen imaging system based on a screen transmission spectrum according to an embodiment of the present invention;

2 is a specific flowchart of a color correction method for an under-screen imaging system based on a screen transmission spectrum according to an embodiment of the present invention;

3 is a schematic diagram of a transmittance curve of a screen sample according to an embodiment of the present invention;

4 is a schematic diagram of a color standard color card according to an embodiment of the present invention;

Fig. 5 is the corresponding RGB value of some colors in the standard color card according to an embodiment of the present invention;

6 is a schematic structural diagram of a color correction system of an under-screen imaging system based on a screen transmission spectrum according to an embodiment of the present invention.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following describes the color correction method and system of the under-screen imaging system based on the screen transmission spectrum proposed according to the embodiments of the present invention with reference to the accompanying drawings. First, the color correction of the under-screen imaging system based on the screen transmission spectrum proposed according to the embodiments of the present invention will be described with reference to the accompanying drawings. Correction method.

FIG. 1 is a flowchart of a color correction method for an under-screen imaging system based on a screen transmission spectrum according to an embodiment of the present invention.

As shown in Figure 1, the color correction method of the imaging system under the screen based on the screen transmission spectrum includes the following steps:

In step S1, a spectrometer is used to obtain the transmittance curve of the OLED screen sample.

Further, in step S1 of the embodiment of the present invention, a transmission spectrometer is used to measure the OLED screen sample to obtain transmittance curves at different wavelengths. Among them, the transmittance curve may also be referred to as a transmittance spectrum curve.

In step S2, the initial compensation matrix of the OLED screen sample is determined according to the transmittance curve.

That is, according to the transmission spectral distribution of the screen sample, a color pre-calibration matrix for the three channels of RGB is obtained.

Further, in the embodiment of the present invention, step S2 is to obtain the average transmittance by calculating the transmittance curve to determine the initial compensation matrix of the OLED screen sample, wherein the initial compensation matrix is for three channels of RGB.

It can be understood that, in the embodiment of the present invention, a transmission spectrum test is performed on the OLED screen, and a pre-calibration matrix is determined according to the transmittance in three industrial standard RGB bands.

In step S3, the under-screen imaging system is pre-calibrated using the initial compensation matrix.

It can be understood that the generated pre-calibration matrix is used to pre-calibrate the images captured by the under-screen imaging system.

Among them, the pre-calibration relationship between the RGB of the pre-calibrated under-screen imaging system and the RGB of the OLED screen sample is:

Among them, R, G, B represent the three channels of the OLED screen sample, C _{0, 3×3} represent the initial compensation matrix, and R ₀ , G ₀ , B ₀ represent the three channels of the pre-calibrated under-screen imaging system.

In step S4, the pre-calibrated under-screen imaging system is used to perform a photo test on the standard color card, and the RGB three-channel test values of the corresponding area in the test result are obtained.

Among them, if the standard color card is used as the test target, only the first three rows of color blocks need to be selected for data acquisition and processing.

After the test, use the RGB value of the standard color card to compare with the RGB value of the test result, and use the difference to generate a correction matrix.

In step S5, the test values of the three RGB channels in the corresponding area are compared with the color standard values in the standard card to determine the compensation matrix.

That is to say, the compensation matrix is obtained according to the difference between the standard RGB value and the test value of each partial area in the standard color card.

In step S6, the under-screen imaging system is calibrated using the compensation matrix, and an imaging test is performed on the standard color card to determine whether there is a color cast phenomenon, if so, repeat steps S4-S6, if not, output the compensation result.

To sum up, as shown in FIG. 2 , the calibration method of the embodiment of the present invention is as follows: first, use a spectrometer to test the transmission spectrum of the screen sample used by the imaging system under the screen; calculate the initial compensation matrix C _0,3×3 according to the obtained projection spectrum; use After the initial compensation matrix performs preliminary color correction on the imaging system under the screen, use the pre-corrected system to shoot the standard color card S _0,m×n to obtain the test value T _i,m×n ; use the difference between the test value and the standard value. The correction compensation matrix C _i,3×3 is calculated from the difference between the corresponding values of the color channels; the standard color card is photographed again, and the correction process is repeated as required.

Embodiment 1, taking RGB as an example, the specific steps are as follows:

(1) Use a transmission spectrometer to measure the screen used in the imaging system under the screen, obtain the transmittance curves at different wavelengths, and obtain the average bandwidth of 10 nm at the operating wavelengths of 700 nm, 546.1 nm and 435.8 nm for the three required imaging systems respectively. transmittance t _λ .

(2) Obtain the initial color compensation matrix C _0,3×3 based on the transmission spectrum of the screen sample through the obtained average transmittance at different wavelengths, and its expression should be as follows:

(3) Use the initial color compensation matrix C _0,3×3 to pre-calibrate the imaging system under the screen, then the relationship between the RGB and the RGB of the captured image after the pre-calibration of the imaging system under the screen can be expressed as:

(4) Use the under-screen imaging system to shoot the standard color swatch S _0,m×n to obtain the test value T _i,m×n , where m and n respectively represent the rows of different standard test color blocks in the field of view of the under-screen imaging system number and number of columns. Taking the color patch distribution of the standard color card in the case of RGB as an example, S _0,m×n can be expressed as the following form. Among them, if the standard color card is used as the test target, only the first three rows of color blocks need to be selected for data acquisition and processing.

(5) Compare the RGB value in each color block in T _0,m×n with the color standard value in the standard color card respectively, obtain the RGB difference value between the standard value and the standard value, and determine the compensation according to the average value of the difference value Matrix C _i,3×3 .

(6) The RGB value of the under-screen imaging system after compensation is obtained according to the compensation matrix C _{i, 3×3} :

According to actual needs, repeat steps (4)-(6) until the test value of the standard color card by the imaging system under the screen is the same as the value of the standard color card.

Embodiment 2, taking the system color correction method for imaging under the screen of a transparent top-emitting OLED screen as an example, the specific steps are as follows:

(1) Use a transmission spectrometer to measure the screen used in the imaging system under the screen, and obtain the wavelength and transmittance curve as shown in Figure 3. As in the imaging system, RGB has corresponding wavelengths. According to the RGB three primary color wavelengths determined by the International Commission on Illumination in 1931, the reference wavelength of R red light is 700nm; the reference wavelength of G green light is 546.1nm; Average transmittance with a bandwidth of 10 nm at each wavelength. In the embodiment of the present invention, the average transmittance of blue light is 41.15%, the average transmittance of green light is 51.51%, and the average transmittance of red light is 48.70%. The normalized transmittances are: 0.7989 for blue light, 1 for green light, and 0.9454 for red light.

(2) Obtain the initial color compensation matrix C _0,3×3 based on the transmission spectrum of the screen sample, and its expression should be as follows:

(3) Using the initial color compensation matrix C _0,3×3 to pre-calibrate the OLED display screen used in the under-screen imaging system in this example, the pre-calibration relationship between RGB and the captured image RGB after the pre-calibration of the under-screen imaging system can be Expressed as:

(4) Use the under-screen imaging system to shoot the standard color swatch S _0,m×n as shown in Figure 4, and obtain the test value T _i,m×n , where m and n represent the difference in the field of view of the under-screen imaging system respectively The number of rows and columns where the standard test color blocks are located.

Taking the color patch distribution of the standard color card in the case of RGB as an example, S _0,m×n can be expressed as the following form. Among them, if the standard color card shown in FIG. 4 is used as the test target, only the first three rows of color blocks need to be selected for data acquisition and processing.

(5) Compare the RGB values in each color block in T _0,m×n with the standard values shown in Figure 5, and obtain the RGB difference matrix T _Δ between the standard values and the standard values, and according to the average of the difference values The value determines the compensation matrix

(6) According to the compensation matrix The RGB value of the under-screen imaging system after compensation is:

Steps (4)-(6) are repeated according to the actual needs, and the cycle optimization is carried out until the usage requirements are met.

According to the color correction method of the under-screen imaging system based on the screen transmission spectrum proposed in the embodiment of the present invention, the under-screen imaging system is pre-calibrated according to the transmission spectrum of the screen sample obtained by the spectrometer, and the pre-calibrated system is used to calibrate the standard The color card is tested to obtain the average calibration value, and the compensation matrix is calculated, and the compensation matrix is continuously corrected according to the test results, so as to correct the color cast of the imaging system under the screen, especially the front camera of the mobile phone or other mobile devices. Imaging, color correction for OLED under-screen imaging systems for pipeline production and calibration scenarios and portable electronic devices.

Next, the color correction system of the under-screen imaging system based on the screen transmission spectrum proposed according to the embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 6 is a color correction system of an under-screen imaging system based on a screen transmission spectrum according to an embodiment of the present invention.

As shown in FIG. 6 , the color correction system 10 of the under-screen imaging system based on the screen transmission spectrum includes: an acquisition module 100 , an initialization module 200 , a pre-calibration module 300 , a test module 400 , a comparison module 500 and a judgment module 600 .

Wherein, the acquisition module 100 is used for acquiring the transmittance curve of the OLED screen sample by using a spectrometer. The initialization module 200 is used to determine the initial compensation matrix of the OLED screen sample according to the transmittance curve. The pre-calibration module 300 is used to pre-calibrate the under-screen imaging system by using the initial compensation matrix. The test module 400 is configured to use the pre-calibrated under-screen imaging system to perform a photo test on the standard color card, and obtain the RGB three-channel test value of the corresponding area in the test result. The comparison module 500 is configured to compare the test values of the three RGB channels in the corresponding area with the color standard values in the standard card to determine a compensation matrix. The judging module 600 is used for calibrating the imaging system under the screen by using the compensation matrix, and performing the imaging test on the standard color card to judge whether there is a color cast phenomenon, and if not, output the compensation result.

It can be understood that the system in the embodiment of the present invention includes components such as a spectrometer, a reflective standard color card, a screen sample used in the under-screen imaging system, and an under-screen imaging system module.

Further, in an embodiment of the present invention, the acquisition module further includes: using a transmission spectrometer to measure the OLED screen sample to acquire transmittance curves at different wavelengths.

Further, in an embodiment of the present invention, in the initialization module, the average transmittance is obtained by calculating the transmittance curve to determine the initial compensation matrix of the OLED screen sample, wherein the initial compensation matrix is for three RGB three channel.

Further, in an embodiment of the present invention, the pre-calibration relationship between the RGB of the pre-calibrated under-screen imaging system and the RGB of the OLED screen sample is:

Among them, R, G, B represent the three channels of the OLED screen sample, C _{0, 3×3} represent the initial compensation matrix, and R ₀ , G ₀ , B ₀ represent the three channels of the pre-calibrated under-screen imaging system.

Further, in an embodiment of the present invention, in the test module, if the standard color card is used as the test target, only the first three rows of color blocks need to be selected for data acquisition and processing.

It should be noted that the foregoing explanations on the embodiments of the color correction method for the under-screen imaging system based on the screen transmission spectrum are also applicable to this system, and are not repeated here.

According to the color correction system of the under-screen imaging system based on the screen transmission spectrum proposed in the embodiment of the present invention, the under-screen imaging system is pre-calibrated according to the transmission spectrum of the screen sample obtained by the spectrometer, and the pre-calibrated system is used to calibrate the standard The color card is tested to obtain the average calibration value, and the compensation matrix is calculated, and the compensation matrix is continuously corrected according to the test results, so as to correct the color cast of the imaging system under the screen, especially the front camera of the mobile phone or other mobile devices. Imaging, color correction for OLED under-screen imaging systems for pipeline production and calibration scenarios and portable electronic devices.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (10)

1. imaging system color correcting method under a kind of screen based on screen transmitted spectrum, which is characterized in that including following step It is rapid:

Step S1 obtains the transmittance graph of OLED screen curtain sample using spectrometer；

Step S2 determines the initial compensation matrix of the OLED screen curtain sample according to the transmittance graph；

Step S3 carries out pre-calibration to imaging system under screen using the initial compensation matrix；

Step S4 carries out test of taking pictures to standard color card using imaging system under the screen after pre-calibration, obtains in test result The RGB triple channel test value of corresponding region；

Tri- lane testing values of RGB of the corresponding region are compared by step S5 with color standard value in the standard card Determine compensation matrix；And

Step S6 calibrates imaging system under the screen using the compensation matrix, and carries out to the standard color card Imaging test judges whether there is colour cast phenomenon, and then repeating said steps S4-S6 then exports compensation knot if it does not exist if it exists Fruit.

2. imaging system color correcting method under the screen according to claim 1 based on screen transmitted spectrum, feature It is, the step S1 further comprises:

The OLED screen curtain sample is measured using transmission-type spectrometer, obtains the transmittance graph under different wave length.

3. imaging system color correcting method under the screen according to claim 1 based on screen transmitted spectrum, feature It is, is to obtain mean transmissivity by calculating the transmittance graph, to determine the OLED screen curtain in the step S2 The initial compensation matrix of sample, wherein the initial compensation matrix is for tri- channels RGB.

4. imaging system color correcting method under the screen according to claim 1 based on screen transmitted spectrum, feature It is, the pre-calibration relationship under the screen after the pre-calibration between the RGB of imaging system and the RGB of the OLED screen curtain sample Are as follows:

Wherein, R, G, B indicate three channels of the OLED screen curtain sample, C_0,3×3Indicate the initial compensation matrix, R₀, G₀, B₀ Three channels of imaging system under screen after indicating the pre-calibration.

5. imaging system color correcting method under the screen according to claim 1 based on screen transmitted spectrum, feature It is, in the step S4, if only needing to choose first three rows color blocks part using the standard color card as test target Carry out data acquisition process.

6. imaging system color calibration system under a kind of screen based on screen transmitted spectrum characterized by comprising

Module is obtained, for obtaining the transmittance graph of OLED screen curtain sample using spectrometer；

Initialization module, for determining the initial compensation matrix of the OLED screen curtain sample according to the transmittance graph；

Pre-calibration module, for carrying out pre-calibration to imaging system under screen using the initial compensation matrix；

Test module obtains test for carrying out test of taking pictures to standard color card using imaging system under the screen after pre-calibration As a result the RGB triple channel test value of middle corresponding region；

Comparison module, for by color standard value in tri- lane testing values of RGB of the corresponding region and the standard card into Row relatively determines compensation matrix；And

Judgment module, for being calibrated using the compensation matrix to imaging system under the screen, and to the reference colour Card carries out imaging test, judges whether there is colour cast phenomenon, then exports compensation result if it does not exist.

7. imaging system color calibration system under the screen according to claim 6 based on screen transmitted spectrum, feature It is, the acquisition module further comprises:

The OLED screen curtain sample is measured using transmission-type spectrometer, obtains the transmittance graph under different wave length.

8. imaging system color calibration system under the screen according to claim 6 based on screen transmitted spectrum, feature It is, is to obtain mean transmissivity by calculating the transmittance graph, to determine the OLED in the initialization module The initial compensation matrix of screen sample, wherein the initial compensation matrix is for tri- channels RGB.

9. imaging system color calibration system under the screen according to claim 6 based on screen transmitted spectrum, feature It is, the pre-calibration relationship under the screen after the pre-calibration between the RGB of imaging system and the RGB of the OLED screen curtain sample Are as follows:

Wherein, R, G, B indicate three channels of the OLED screen curtain sample, C_0,3×3Indicate the initial compensation matrix, R₀, G₀, B₀ Three channels of imaging system under screen after indicating the pre-calibration.

10. imaging system color calibration system under the screen according to claim 6 based on screen transmitted spectrum, feature It is, in the test module, if only needing to choose first three rows color block portion using the standard color card as test target Divide and carries out data acquisition process.