Image distortion compensation display device and image distortion compensation method using the same
A display device capable of image distortion compensation may be provided that includes a display panel which outputs a compensated video signal. The display panel includes: an input interface controller which receives a video signal; a memory which stores the video signal received by the input interface controller; a memory controller which controls an input and an output of the memory; and an image distortion compensation device which handles a pixel position and a pixel value of the video signal stored in the memory and generates the compensated video signal.
1. An image distortion compensation method using a display device capable of image distortion compensation, the method comprising:
receiving a coordinate value (x d , y d ) of a pixel of an image to be artificially distorted;
dividing an area where an image is displayed into M×N grid sections and finding which section in the sections divided by the M×N grid the coordinate value (x d , y d ) of the pixel is included in;
first loading to read a distortion change amount which is represented by a vector and is at a vertex of the section in which the coordinate value (x d , y d ) of the pixel is included in the sections;
first calculating such that a coordinate value (x r , y r ) to be referenced is calculated by adding a sum of weight values on the basis of the coordinate value (x d , y d ) of the pixel and the loaded distortion change amount;
second calculating to calculate neighboring pixel coordinate values required for interpolation by using the coordinate value (x r , y r ) to be referenced;
second loading such that read pixel values corresponding to the neighboring pixel coordinate values calculated in the second calculating are read from a fraction memory buffer;
third calculating to calculate a pixel value for a compensated output image by applying the weight value on the basis of which pixel coordinate value the coordinate (x r , y r ) is closer to among the neighboring pixel coordinate values calculated in the second calculating; and
outputting to output the pixel value for the compensated output image.
2. The image distortion compensation method of claim 1 , further comprising, before the finding, checking whether a look-up table is updated or not and updating the look-up table from the memory.
3. The image distortion compensation method of claim 2 , wherein the look-up table comprises a plurality of look-up tables comprising different color information.
4. The image distortion compensation method of claim 1 , further comprising, between the second calculating and the second loading, checking whether a neighboring pixel position exists in the fraction memory buffer or not and reading a data segment from the memory by using the coordinate value to be referenced.
5. The image distortion compensation method of claim 1 , wherein, in the finding, when the distortion is within a predetermined range, it is determined that the distortion has not occurred.
6. The image distortion compensation method of claim 1 , wherein, in the finding, an amount of vector data which is stored in a look-up table is reduced to a half or less by using symmetry.