Image processing apparatus for preventing occurrence of moire in

Details Image processing apparatus for preventing occurrence of moire in Image processing apparatus for preventing occurrence of moire in

1995-06-05

1997-09-30

Razavi, Michael T.

Image analysis

Image compression or coding

Transform coding

382264, 382275, 358454, 358433, G06T 500

Patent

active

056733402

ABSTRACT:
An image processing apparatus for image compression and decompression in which occurrence of moire in a reconstructed image is eliminated. The apparatus includes an encoder part for encoding an image into a compressed image, and a decoder part for decoding the compressed image into a reconstructed image. The encoder part includes an input part, a predictive coder, a subtracter, an ADCT encoder and a code memory. The predictive coder and subtracter act to remove high-frequency components prior to the calculation of the DCT coefficients by the ADCT encoder, thereby preventing moire in the reconstructed image.

REFERENCES:
patent: 4541012 (1985-09-01), Tescher
patent: 4827533 (1989-05-01), Tanaka
patent: 5289548 (1994-02-01), Wilson et al.

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