Image analysis – Image enhancement or restoration – Image filter
Patent
1996-12-20
1999-10-26
Rodgers, Scott
Image analysis
Image enhancement or restoration
Image filter
382263, 382266, 382275, 358463, G06K 940, G06T 500, H04N 1409
Patent
active
059741937
ABSTRACT:
Edge Enhanced Noise Reduction (EENR) is a frequency dependent instantaneous compander system. It is applied only in the encoder both to Chrominance and luminance, and is best placed after the horizontal and vertical down sampling filters in the pre-processing stages of an encoder (not shown per se). High frequency, low level information (mainly noise) are reduced significantly in amplitude. In particular, EENR is designed to preserve edge details. In addition, a vertical recursive filter can be used to prevent low level vertical information from being removed by the system. This is partially useful in the luminance path. High level, high frequency components remain virtually unaffected. The system is `transparent` to low frequency information. EENR has been designed to work in conjunction with MPEG encoding presented with source material which is slightly noisy and where the transmission bit rate is being constrained. It has been designed to provide minimal loss in picture quality due to the noise reduction process itself. It is not necessary to provide a complementary process in the receiver.
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NDS Limited
Rodgers Scott
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