Recursive noise reduction device having improved adaptability wi

Details Recursive noise reduction device having improved adaptability wi Recursive noise reduction device having improved adaptability wi

1996-05-28

1998-02-17

Trammell, James P.

Boots, shoes, and leggings

348607, 348620, H04N 5213

Patent

active

057197938

ABSTRACT:
A recursive noise reduction device which has adaptability with respect to changes in input image data which are not noise, resulting from, e.g., scene changes and subject movement, and in which a rise in the black level and a drop in the white level does not occur. The recursive noise reduction device includes a storage unit which stores image signals in field or frame units, and a computation unit which multiplies by an input image signal A by K (0<K<1), and multiplies by (1-K) an image signal B from a previous recursive calculation, which is output from the storage unit. The computation unit adds the input image signal A, which has been multiplied by K, to the signal B, which has been multiplied by (1-K), and the computation results are stored in the storage unit. A comparison device compares the signal A with the signal B. The value obtained by rounding the result of the addition upward to the next whole number is considered the computation result when A>B, and the value obtained by rounding the result of the addition downward to the next whole number is considered the computation result when A<B. The comparison device and the computation unit may comprise a Look-up Table.

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