Display apparatus, calibration apparatus and calibration method thereof

1. A display apparatus comprising:

a display comprising display modules, each of the display modules including light emitting pixels;

a storage configured to store a correction coefficient for each of the light emitting pixels included in each of the display modules; and

a processor configured to apply the correction coefficient for each of the light emitting pixels respectively to a pixel value of each of the light emitting pixels to correct the pixel value of each of the light emitting pixels,

wherein the correction coefficient for each of the light emitting pixels is determined based on a first target value for reducing a color step between each of the display modules,

wherein the first target value is determined based on one or more representative pixel values of the display modules,

wherein the correction coefficient for each of the light emitting pixels is further determined by determining an actual pixel value of each of the light emitting pixels, based on a degree of interference between the light emitting pixels that are modeled based on a captured image of the display, and

wherein the degree of interference between the light emitting pixels is modeled based on at least one of a distance between the light emitting pixels, a peak pixel value of the light emitting pixels, a light distribution deviation of the light emitting pixels and a disposition angle of the light emitting pixels.

2. The display apparatus as claimed in claim 1 , wherein the pixel value represents either one or both of luminance and color.

3. The display apparatus as claimed in claim 1 , wherein the correction coefficient for each of the light emitting pixels is determined by compensating a first correction coefficient by the first target value,

wherein the first correction coefficient is determined so that the determined actual pixel value of each of the light emitting pixels to which the first correction coefficient is applied has a second target value that is set for uniformity between the light emitting pixels.

4. The display apparatus as claimed in claim 1 , wherein the degree of interference between the light emitting pixels is modeled based on the distance between a target pixel and an adjacent pixel, among the modeled pixels, and the peak pixel value of the adjacent pixel.

5. The display apparatus as claimed in claim 1 , wherein the degree of interference between the light emitting pixels is further modeled based on either one or both of the light distribution deviation between a target pixel and an adjacent pixel, among the light emitting pixels, and the disposition angle at which the target pixel and the adjacent pixel are disposed.

6. The display apparatus as claimed in claim 1 , wherein each of the display modules is a light emitting diode (LED) module comprising LED pixels, or an LED cabinet to which LED modules are connected.

7. A calibration method of a display comprising display modules, the method comprising:

modeling, by a processor of a calibration apparatus, a degree of interference between light emitting pixels included in each of the display modules, based on a captured image of the display;

determining, by the processor, a correction coefficient for each of the light emitting pixels, based on the degree of interference that are modeled;

determining, by the processor, a representative pixel value of each of the display modules, based on the captured image of the display;

determining, by the processor, a first target value for reducing a color step between each of the display modules, based on the determined representative pixel value of each of the display modules;

compensating, by the processor, the correction coefficient, based on the determined representative pixel value of each of the display modules and the determined first target value;

wherein the correction coefficient is determined based on a second target value for uniformity between pixels, and

wherein the degree of interference between the light emitting pixels is modeled based on at least one of a distance between the light emitting pixels, a peak pixel value of the light emitting pixels, a light distribution deviation of the light emitting pixels and a disposition angle of the light emitting pixels.

8. The calibration method as claimed in claim 7 , wherein the modeling the degree of interference comprises:

determining the distance between a target pixel and an adjacent pixel, among the light emitting pixels, and the peak value of the adjacent pixel; and

modeling the degree of interference between the light emitting pixels, based on the determined distance and the determined peak pixel value, and

wherein the determining the correction coefficient comprises:

determining an actual pixel value of the target pixel, based on the modeled degree of interference; and

determining the correction coefficient, based on the determined actual pixel value and the second target value.

9. The calibration method as claimed in claim 8 , wherein the determining of the actual pixel value comprises determining the actual pixel value of the target pixel not interfering with the adjacent pixel, based on the determined degree of interference and a pixel value of the target pixel that is measured from the captured image, and

wherein the determining of the correction coefficient comprises determining the correction coefficient so that the determined actual pixel value to which the correction coefficient is applied has the second target value.

10. The calibration method as claimed in claim 7 , wherein the determining of the degree of interference comprises determining the degree of interference between the light emitting pixels, based on the light distribution deviation between a target pixel and an adjacent pixel.

11. The calibration method as claimed in claim 7 , wherein the determining of the degree of interference comprises determining the degree of interference between the light emitting pixels, based on the disposition angle at which a target pixel and an adjacent pixel are disposed.

12. The calibration method as claimed in claim 7 , wherein each of the display modules is a light emitting diode (LED) module comprising LED pixels, or an LED cabinet to which LED modules are connected.

13. A calibration apparatus comprising:

a camera configured to capture an image of a display comprising display modules to generate a captured image;

a storage configured to store the captured image; and

a processor configured to:

model a degree of interference between light emitting pixels included in each of the display modules, based on the captured image of the display;

determine a correction coefficient for each of the light emitting pixels, based on the degree of interference that are modeled;

determine a representative pixel value of each of the display modules, based on the captured image;

determine a first target value for reducing a color step between each of the display modules, based on the determined representative pixel value of each of the display modules; and

compensate the correction coefficient, based on the determined representative pixel value of each of the display modules and the determined first target value,

wherein the correction coefficient is determined based on a second target value for uniformity between pixels, and

wherein the degree of interference between the light emitting pixels is modeled based on at least one of a distance between the light emitting pixels, a peak pixel value of the light emitting pixels, a light distribution deviation of the light emitting pixels and a disposition angle of the light emitting pixels.

14. The calibration apparatus as claimed in claim 13 , wherein the processor is further configured to:

determine the distance between a target pixel and an adjacent pixel, among the light emitting pixels and the peak pixel value of the adjacent pixel;

model the degree of interference between the light emitting pixels, based on the determined distance and the determined peak pixel value;

determine an actual pixel value of the target pixel, based on the modeled degree of interference; and

determine the correction coefficient, based on the determined actual pixel value and the second target value.

15. The calibration apparatus as claimed in claim 14 , wherein the processor is further configured to:

determine the actual pixel value of the target pixel not interfering with the adjacent pixel, based on the determined degree of interference and a pixel value of the target pixel that is measured from the captured image; and

determine the correction coefficient so that the determined actual pixel value to which the correction coefficient is applied has the second target value.

16. The calibration apparatus as claimed in claim 13 , wherein the processor is further configured to determine the degree of interference between the light emitting pixels, based on the light distribution deviation between a target pixel and an adjacent pixel.

17. The calibration apparatus as claimed in claim 13 , wherein the processor is further configured to determine the degree of interference between the light emitting pixels, based on the disposition angle at which a target pixel and an adjacent pixel are disposed.

18. The calibration apparatus as claimed in claim 13 , wherein each of the display modules is an LED module comprising LED pixels, or an LED cabinet to which LED modules are connected.