Recursive noise reduction device for reducing noise of stationar

Details Recursive noise reduction device for reducing noise of stationar Recursive noise reduction device for reducing noise of stationar

1994-12-12

1996-04-16

Groody, James J.

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

348620, H04N 5213

Patent

active

055087515

ABSTRACT:
A recursive noise reduction device which reduces the noise component(s) of stationary region(s) in a moving image, successively cyclically calculating the coefficient (K) times of the present image signals and (1-K) times of the previous image signal having a correlation with the present image signal. The present image signal is a signal of an image of a frame or field that is presently entered and the previous image signal is a signal of an immediately previous image of the frame or field. The recursive noise reduction device includes a calculating unit to recursively calculate a sum of the coefficient K times the present image signal and (1-K) times the previous image signal, modifying the value of the aforementioned coefficient K according to the number of times of cyclic calculation, and a movement detection unit to detect the movement of an image within the stationary region(s) of the image. The value of the coefficient K is modified according to the output signal of the movement detection unit. Preferably, in the case that movement is detected by the movement detection unit, the value of the coefficient K is made equal to 1 as regards only the movement region of the image, and after this, the value of K is gradually made smaller.

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U.S. Ser. No. 08/062,768 filing date May 18, 1993 Keiichi Nitta assignee Nikon Corporation.
U.S. Ser. No. 08/356,129 filing date Dec. 15, 1994 Nitta assignee Nikon Corporation.

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