Hybrid waveform and model-based encoding and decoding of image s

Details Hybrid waveform and model-based encoding and decoding of image s Hybrid waveform and model-based encoding and decoding of image s

1996-09-12

1999-06-29

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

3582612, 3582611, 3582613, 382238, H04N 1417, H04N 1419, H04N 1415, G06K 936

Patent

active

059176091

ABSTRACT:
A hybrid waveform and model-based image signal encoder and decoder are described. The image signal is waveform-encoded (11) and decoded (31) so as to approximate the waveform of the original input signal as well as possible after compression. In order to compensate its loss, the noise component of the signal (or, more generally, a signal component which gets lost by the waveform encoding) is model-based encoded (12,13) and separately transmitted or stored. In the decoder, the noise is regenerated (32-34) and added (36) to the waveform-decoded image signal. The invention is particularly applicable to compression of medical X-ray angiographic images where loss of noise leads a cardiologist or radiologist to believe that the image is distorted.

REFERENCES:
patent: 5117287 (1992-05-01), Koike et al.
patent: 5592228 (1997-01-01), Dachiku et al.
"Model-Based/Waveform Hybrid Coding for Videotelephone Images", by Y. Nakaya et al, IEEE Conf. on Acoustics, Speech and Signal Processing (ICASSP) 91, vol. 4, 1991, pp. 2741-2744.
"On Adaptive DCT Coding Techniques for Digital Video Recording", IERE Proc., 7th Int. Conf. Video, Audio and Data Recording, Mar. 22-24, York U.K., pp. 199-204.
"The LOT: Transform Coding Without Blocking Effects", IEEE Trans. on Acoustics, Speech and Signal Processing, vol. 37, No. 4, Apr. 1989.

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