Method and device for Mura defect repair

1. A method, comprising:

1) decoding an image input signal into pixel grayscale data of a frame image;

2) looking up a DeMura lookup table and DeMura control data; and performing linear interpolation on Mura designated areas of the frame image according to the DeMura lookup table and DeMura control data, to obtain compensation data of the Mura designated areas of the frame image; and

3) superposing the compensation data and the pixel grayscale data of the frame image to obtain a compensated frame image signal;

wherein:

the DeMura control data comprises a plurality of compensation grayscale nodes, and the DeMura lookup table comprises a plurality of node lookup tables in one-to-one correspondence to the plurality of compensation grayscale nodes;

when a grayscale value of a pixel point Px in the Mura designated areas is on one of the compensation grayscale nodes, acquire compensation data of adjacent pixel points M and N in the same row or column as the pixel point Px from a node lookup table corresponding to the one of the compensation grayscale nodes, and compensation data of the pixel point Px in the grayscale value is calculated by the following formula:

P =(( X N −X Px )× M +( X Px −X M )× N )/( X N −X M )  (1)

the pixel points M and N are in the same row as the pixel point P x ; X Px represents a horizontal coordinate of the pixel point Px, and P represents the compensation data of the pixel point P x ; X M represents a horizontal coordinate of the pixel point M, and M represents the compensation data of the pixel point M; X N represents a horizontal coordinate of the pixel point N, and N represents the compensation data of the pixel point N;

or, compensation data of the pixel point P x in the grayscale value is calculated by the following formula:

P =(( Y N −Y Px )× M +( Y Px −Y M )× N )/( Y N −Y M )  (2)

the pixel points M and N are in the same column as the pixel point P x ; Y Px represents a vertical coordinate of the pixel point P x , and P represents the compensation data of the pixel point P x ; Y M represents a vertical coordinate of the pixel point M, and M represents the compensation data of the pixel point M; Y N represents a vertical coordinate of the pixel point N, and N represents the compensation data of the pixel point N.

2. The method of claim 1 , wherein the Mura designated areas share the upper grayscale bound, the lower grayscale bound and the plurality of compensation grayscale nodes.

3. The method of claim 1 , wherein when a pixel point Pc is located in a plurality of Mura designated areas, corresponding compensation data of the pixel point Pc in each of the Mura designated areas is accumulated.

4. A method, comprising:

1) decoding an image input signal into pixel grayscale data of a frame image;

2) looking up a DeMura lookup table and DeMura control data; and performing linear interpolation on Mura designated areas of the frame image according to the DeMura lookup table and DeMura control data, to obtain compensation data of the Mura designated areas of the frame image; and

3) superposing the compensation data and the pixel grayscale data of the frame image to obtain a compensated frame image signal;

wherein:

the DeMura control data comprises a plurality of compensation grayscale nodes, and the DeMura lookup table comprises a plurality of node lookup tables in one-to-one correspondence to the plurality of compensation grayscale nodes;

when a grayscale value of a pixel point Py in the Mura designated areas is between two adjacent compensation grayscale nodes Plane1 and Plane2, separately acquire compensation data of the pixel point Py when the grayscale value of the pixel point Py is on the two compensation grayscale nodes Plane1 and Plane2, and compensation data of the pixel point Py in the grayscale value T is calculated by the following formula:

P =((Plane2− T )× S +( T −Plane1)× R )/(Plane2−Plane1)  (3)

P represents the compensation data of the pixel point Py in the grayscale T; R represents the compensation data of the pixel point Py on the compensation grayscale node Plane2; and S represents the compensation data of the pixel point Py on the compensation grayscale node Plane1.

5. The method of claim 4 , wherein the Mura designated areas share the upper grayscale bound, the lower grayscale bound and the plurality of compensation grayscale nodes.

6. The method of claim 4 , wherein when a pixel point Pc is located in a plurality of Mura designated areas, corresponding compensation data of the pixel point Pc in each of the Mura designated areas is accumulated.