Method and apparatus of reducing random noise in digital video streams

A method for reducing noise of a digital video stream comprising:

• determining a noise value indicative of noise for a frame of the video stream;
• determining a motion value indicative of motion between two frames of the video stream, the motion value based at least in part on the noise value;
• identifying at least one pixel value in the frame as an edge;
• modifying the identified pixel value based at least in part on a blending factor and the noise value;
• modifying at least one pixel value in the frame based at least in part on a value for a pixel in a prior frame and the noise value;
• and
• generating a composite pixel value based at least in part on the spatially modified pixel value, the temporally modified pixel value, and the motion value.

A device for reducing noise of a digital video stream comprising:

• means for determining a noise value indicative of noise for a frame of the video stream;
• means for determining a motion value indicative of motion between two frames of the video stream, the motion value based at least in part on the noise value;
• means for identifying at least one pixel value in the frame as an edge and for modifying the identified pixel value based at least in part on a blending factor and the noise value;
• means for modifying at least one pixel value in the frame based at least in part on a value for a pixel in a prior frame and the noise value;
• and
• means for generating a composite pixel value based at least in part on the spatially modified pixel value, the temporally modified pixel value, and the motion value.

A computer-readable storage medium comprising instructions executable by a processor of an apparatus for reducing noise in a digital video stream, the instructions causing the apparatus to:

• determine a noise value indicative of noise for a frame of the video stream;
• determine a motion value indicative of motion between two frames of the video stream, the motion value based at least in part on the noise value;
• identify at least one pixel value in the frame as an edge and modify the identified pixel value based at least in part on a blending factor and the noise value;
• modify at least one pixel value in the frame based at least in part on a value for a pixel in a prior frame and the noise value;
• and
• generate a composite pixel value based at least in part on the spatially modified pixel value, the temporally modified pixel value, and the motion value.

A device for reducing noise of a digital video stream comprising:

• a processor configured to:
• determine a noise value indicative of noise for a frame of the video stream;
• determine a motion value indicative of motion between two frames of the video stream, the motion value based at least in part on the noise value;
• identify at least one pixel value in the frame as an edge and modify the identified pixel value based at least in part on a blending factor and the noise value;
• modify at least one pixel value in the frame based at least in part on a value for a pixel in a prior frame and the noise value;
• and
• generate a composite pixel value based at least in part on the spatially modified pixel value, the temporally modified pixel value, and the motion value.