Patent ID: 7983510

Claim:
A noise reduction device, a video sequence being inputted into a display system, the video sequence comprising N image frames, each of the image frames being composed of T pixels, each of the pixels having a gray level, N and T being positive integers, the noise reduction device being applied in the display system and selectively adjusting the gray level of the jth pixel of the ith image frame, i being an integer from 2 through N, j being an integer from 1 through T, the gray levels of the (i−1)th image frame of the video sequence already being adjusted and stored in a buffer of the display system, the noise reduction device comprising: a motion detector, for determining whether the jth pixel is a motion pixel or a static pixel; and a first noise reduction module, if the jth pixel is a motion pixel, the first noise reduction module directly storing the gray level of the jth pixel without adjustment into the buffer, if the jth pixel is a static pixel, the first noise reduction module adjusting the gray level of the jth pixel by the following formula: GL new =( GL j,i-1 *W+GL j,i )/( W+ 1), wherein GL new represents the adjusted gray level of the jth pixel, GL j,i-1 represents the gray level of the jth pixel of the (i−1)th image frame, GL j,i represents the gray level of the jth pixel of the ith image frame, W represents a weighting, and the first noise reduction module stores the adjusted gray level (GL new ) of the jth pixel into the buffer.