Apparatus and method for reducing qauntization error in digital

Details Apparatus and method for reducing qauntization error in digital Apparatus and method for reducing qauntization error in digital

1996-02-27

1999-05-25

Au, Amelia

Television

Image signal processing circuitry specific to television

Noise or undesired signal reduction

345155, 382261, 382264, H04N 521

Patent

active

059073705

ABSTRACT:
In an image signal processing apparatus and processing method, intermediate gradation is produced by way of a bit expansion to reduce a quantizing noise. The image signal processing apparatus is comprised of: bit expanding means for bit-expanding an n-bit quantized input image signal into an m-bit (symbols "n" and "m" are integers, and own a relationship of n<m); control signal output means for outputting a control signal based upon the input image signal; and a converting unit for adaptively converting the signal from the bit expanding means into an m-bit signal in response to the control signal from the control signal output means. Also, the image signal processing method comprises the steps of: bit-expanding an n-bit quantized input image signal to an m-bit (symbol "n" and "m" are integers and own a relationship of n>m); and adaptively producing lower order (m-n) bits in accordance with an image nature of the input image signal to thereby be converted into an m-bit signal.

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