Image processing method for a TFT LCD

Abstract

Image compression, decompression and motion detection methods are described. Two temporally adjacent frame images, a previous time frame and a current time frame, are compressed in round-off and averaging techniques. Next, according to the compressed data of two corresponding pixels of the two frame images, whether or not the pixel of the current time frame image is of a motion picture is detected. If the pixel is of a motion picture, the compressed pixel data of the previous time frame image is decompressed, and an overdrive process is performed on the decompressed pixel data and the original pixel data of the current time frame image to produce an overdrive output. If the pixel is not of a motion picture, an overdrive process is not performed.

1 . An image compression method for a TFT LCD, an image being divided into a plurality of pixels, signals representing said plurality of pixels of said image being converted into RGB form data, said RGB form data being converted into YUV form data, said method comprising: 
 averaging U components and V components of said plurality of pixels respectively, to obtain a same Ua component and a same Va component for said plurality of pixels, a Y component, said Ua component and said Va component thereby forming YUaVa data.    
   
   
       2 . The method of  claim 1 , wherein the Y component is represented by B0 bits, the U component is represented by B1 bits, the V component is represented by B2 bits, and after obtaining said Ua component and Va component said method further comprises: 
 transforming said YUaVa data of said plurality of pixels into YmUmVm form data, wherein said Ym component is represented by B3 bits, said Um component is represented by B4 bits, said Vm component is represented by B5 bits, B3 is smaller than B0, B4 is smaller than B1, and B5 is smaller than B2, and    wherein said Ym component is equal to an integer quotient when said Y component plus 2 to the power of (B0−B3−1) is divided by 2 to the power of (B0−B3), said Um component is equal to the integer quotient when said Ua component plus 2 to the power of (B1−B4−1) is divided by 2 to the power of (B1−B4), and said Vm component is equal to the integer quotient when said Va component plus 2 to the power of (B2−B5−1) is divided by 2 to the power of (B2−B5).    
   
   
       3 . The method of  claim 1 , wherein the Y component is a luminance component, and the U component and V component are chrominance components.  
   
   
       4 . An image decompression method for a TFT LCD, an image being divided into a plurality of pixels, compressed YmUmVm form data of each pixel of a first time frame image, called YpUpVp data, being produced, compressed YmUmVm form data of each pixel of a second time frame image, called YcUcVc data, also being produced, said Yp component being represented by B3 bits, said Up component being represented by B4 bits, said Vp component being represented by B5 bits, said second time being later than said first time, and said two frame images being temporally adjacent, said method comprising: 
 comparing said YpUpVp data and said YcUcVc data of two corresponding pixels of said first time frame image and said second time frame image, then transforming said YpUpVp data into YdUdVd data, wherein said Yd component is represented by B0 bits, said Ud component is represented by B1 bits, said Vd component is represented by B2 bits, B3 is smaller than B0, B4 is smaller than B1, and B5 is smaller than B2; and    wherein when said Yp component is larger than said Yc component, said Yd component is equal to said Yp component multiplied by 2 to the power of (B0−B3), plus 2 to the power of (B0−B3) and minus 1, and said Yd component is otherwise equal to said Yp component multiplied by 2 to the power of (B0−B3),    wherein when said Up component is larger than said Uc component, said Ud component is equal to said Up component multiplied by 2 to the power of (B1−B4), plus 2 to the power of (B1−B4) and minus 1, and said Ud component is otherwise equal to said Up component multiplied by 2 to the power of (B1−B4); and    wherein when said Vp component is larger than said Vc component, said Vd component is equal to said Vp component multiplied by 2 to the power of (B2−B5), plus 2 to the power of (B2−B5) and minus 1, and said Vd component is otherwise equal to said Vp component multiplied by 2 to the power of (B2−B5).    
   
   
       5 . A method of detecting a motion image for a TFT LCD, an image being divided into a plurality of pixels, compressed YmUmVm form data of a pixel of a first time frame image, called YpUpVp data, being produced, and compressed YmUmVm form data of a pixel of a second time frame image, called YcUcVc data, also being produced, wherein positions of said two pixels on said two frame images correspond, said second time is later than said first time, said two frame images are temporally adjacent, and said second time frame image is a current time input frame image, said method comprises: 
 computing a first difference between said Yp component and said Yc component, a second difference between said Up component and said Uc component, and a third difference between said Vp component and said Vc component representing said two corresponding pixels of said first time frame image and said second time frame image.    
   
   
       6 . The method of  claim 5 , further comprising comparing said first difference with a first threshold, said second difference with a second threshold, and said third difference with a third threshold, and when at least one of said first difference, said second difference, and said third difference is larger than said first threshold, said second threshold, and said third threshold, respectively, judging the pixel of said two corresponding pixels that is of said second time frame image to be of a motion picture.  
   
   
       7 . The method of  claim 6 , wherein when none of said first difference, said second difference, and said third difference is larger than said first threshold, said second threshold, and said third threshold, respectively, further judging the pixel of said two corresponding pixels that is of said second time frame image to be of a still picture.  
   
   
       8 . The method of  claim 6 , wherein after judging the pixel of said two corresponding pixels that is of said second time frame image to be of a motion picture, an overdrive processing between said two corresponding pixels is performed.  
   
   
       9 . The method of  claim 6 , wherein said first threshold, said second threshold, and said third threshold are configured to adapt to image inputs under different noise conditions.  
   
   
       10 . A method of image processing for a TFT LCD, an image being divided into a plurality of pixels, said method comprising: 
 converting signals representing a pixel of a first time frame image into RGB form data, and converting signals representing a pixel of a second time frame image into RGB form data, called RcGcBc data, wherein positions of said two pixels on said two frame images correspond, said second time is later than said first time, said two frame images are temporally adjacent, and said second time frame image is a current time input frame image;    transforming said RGB form data representing said two pixels into YUV form data;    compressing said YUV form data of said pixel of said first time frame image into YmUmVm form data, called YpUpVp data, and compressing said YUV form data of said pixel of said second time frame image into YmUmVm form data, called YcUcVc data;    determining if said pixel of said second time frame image is of a motion picture; wherein    when said pixel of said second time frame image is judged to be of a motion picture, comparing said YpUpVp data and said YcUcVc data of said two corresponding pixels, decompressing said YpUpVp data into YdUdVd data, then transforming said YdUdVd data into RGB form data, called R′G′B′ data, and performing an overdrive processing on said RcGcBc data and said R′G′B′ data of said two corresponding pixels to produce RoGoBo data as an output;    and when said pixel of said second time frame image is judged to be not of a motion picture, providing said RcGcBc data as an output.    
   
   
       11 . The method of  claim 10 , wherein the Y component of said YUV form data is a luminance component, and the U component and V component of said YUV form data are chrominance components.