System and method of spatio-temporal edge-preserved filtering techniques to reduce ringing and mosquito noise of digital pictures

A method, comprising:

• selecting a first block of pixels at least one integrated circuit set;
• determining whether the first block of pixels contains an edge pixel;
• selecting a second block of pixels adjacent to the first block of pixels;
• determining if the second block of pixels adjacent to the first block of pixels contains an edge pixel;
• if either the first or second block of pixels contains an edge pixel:
• selecting a first pixel among the first block of pixels,
• determining if the first pixel is a mosquito noise pixel,
• applying a mosquito filter if the first pixel is a mosquito noise pixel, and
• applying an edge-preserved filtering if the first pixel is not a ringing noise pixel,
• wherein applying a mosquito filter comprises:
• creating a first sub-block of pixels from the first block of pixels;
• creating a second sub-block of pixels from the block of pixels of the same size of the first sub-block of pixels, wherein the center block pixel of the first sub-block is different than the center block pixel of the second sub-block;
• generating a first mean value associated with the first block center block pixel with the pixels of the first sub-block;
• generating a second mean value associated with the pixels of the second sub-block at the second sub- block center block pixel;
• and
• generating a final median value as a function of at least the first mean value and the second mean value.

A system, comprising:

• a video decoder to decode a video bitstream;
• and
• an integrated circuit chip to:
• select a block of pixels from the decoded video bitstream;
• determine whether the block of pixels contains an edge pixel;
• if the block of pixels contains an edge pixel:
• select a first pixel among the block of pixels;
• determine if the first pixel is a ringing noise pixel;
• apply a ringing filter if the first pixel exhibits ringing noise;
• and
• apply an edge-preserved filter if the first pixel is not a ringing noise pixel,
• wherein applying the ringing filter comprises:
• creating a first sub-block of pixels from the block of pixels;
• creating a second sub-block of pixels from the block of pixels of the same size of the first sub-block of pixels, wherein the center block pixel of the first sub-block is different than the center block pixel of the second sub-block;
• generating a median value associated with the first block center block pixel with the pixels of the first sub-block;
• and
• generating a median value associated with the pixels of the second sub-block at the second sub- block center block pixel.