Television – Image signal processing circuitry specific to television – Motion dependent key signal generation or scene change...
Reexamination Certificate
2005-09-27
2009-08-04
Ometz, David L (Department: 2622)
Television
Image signal processing circuitry specific to television
Motion dependent key signal generation or scene change...
C348S699000, C348S700000, C348S607000, C375S240160
Reexamination Certificate
active
07570309
ABSTRACT:
An improved temporal noise reduction method and system detects the global motion and adjusts the overall gain of the temporal filtering. Temporal noise reduction is applied to two video frames, wherein one video frame is the current input noisy frame, and the other video frame is a previous filtered frame stored in memory. In this method, noise estimation is first performed to estimate the noise variance/standard deviation in the input video sequence. Then, motion estimation is applied to obtain the motion vectors indicating relative motion between the pixels in the current noisy frame and the corresponding pixels in the previous noise-reduced frame. From such motion vectors, global motion estimation is applied to estimate the camera motion of the video sequence. If reliable global motion is obtained, the overall gain of the temporal filtering is reduced by adjusting the estimated noise level. Motion blur is thus prevented.
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Kim Yeong-Taeg
Zhou Zhi
Désir Jean W
Myers Andras Sherman LLP
Ometz David L
Samsung Electronics Co,. Ltd.
Sherman, Esq. Kenneth L.
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