Image encoding and decoding method and apparatus using edge synt

Details Image encoding and decoding method and apparatus using edge synt Image encoding and decoding method and apparatus using edge synt

1998-05-19

1999-11-23

Couso, Jose L.

Image analysis

Image compression or coding

Interframe coding

G06K 936

Patent

active

059914483

ABSTRACT:
A digitized image is encoded by detecting edges in the image, encoding the position and sharpness of the detected edges, smoothing and reducing the size of the digitized image, and encoding the resulting reduced image. A digitized image encoded in this way is reconstructed by generating a horizontal edge image and a vertical edge image, or a horizontal edge image, a vertical edge image, and a diagonal edge image, from the encoded edge position and sharpness information, smoothing each of these edge images by a series of filters to obtain a series of edge images, filtering each edge image in each series with an edge synthesis filter to synthesize a high-frequency image, decoding the reduced image, and performing an inverse wavelet transform on the decoded reduced image and the high-frequency images.

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R. Montufar-Chaveznava et al., "Astronomical Image Coding using an Edge and Texture Model", Proceedings of the IEEE-SP International Symposium on Time-Frequency and Time Scale Analysis (Oct. 25-28, 1994) pp. 148-151.
P.J. Burt et al., "The Laplacian Pyramid as a Compact Image Code", IEEE Transaction on Communications, vol. No. 4. (Apr. 1983) pp. 532-540.
Stephane Mallet et al., "Compact Image Coding from Edges with Wavelets", ICASSP 91: 1991 International Conference on Acoustics, Speech and Signal Processing, Toronto, Ontario, Canada (May 14-17, 1991) pp. 2745-2748.

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