METHOD AND APPARATUS OF REDUCING RANDOM NOISE IN DIGITAL VIDEO STREAMS

摘要

Method and apparatus for reducing random noise in digital video streams are described. In one innovative aspect, the device includes a noise estimator. The device also includes a motion detector configured to 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. The device further includes a spatial noise reducer configured to filter the image data based at least in part on a blending factor and the noise value. The device also includes a temporal noise reducer configured to filter the video data based on the motion value and the noise value. The device also includes a blender configured to blend the spatial and temporal filtered values to provide a weighted composite filtered output image.

主权项

1. A device for reducing noise of a digital video stream comprising:
a noise estimator configured to determine a noise value indicative of noise for a frame of the video stream; a motion detector configured to 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; a spatial noise reducer configured to 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; a temporal noise reducer configured to 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 a blender configured to 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.