Image compression method using wavelet transform techniques

Details Image compression method using wavelet transform techniques Image compression method using wavelet transform techniques

1996-01-19

2000-05-30

Lee, Thomas D.

Image analysis

Image compression or coding

Pyramid, hierarchy, or tree structure

382248, 348398, 348405, G06K 936, H04N 712

Patent

active

060699779

ABSTRACT:
An image compression method is provided which uses a wavelet transform technique to generate transform coefficients relating to an input image. Furthermore, the method generates and encodes an efficient tree structure of the transform coefficients by performing the following steps. First, transform coefficients are obtained by transforming an input image in accordance with the wavelet transforming technique. Then, a quantizing interval which minimizes quantization errors is determined for a predetermined step size and is determined according to statistical characteristics of the input image. Then, a simple tree structure is generated based on the transform coefficients, and such tree structure is modified by using statistical characteristics of the transform coefficients to produce a monotonically decreasing tree structure. The resultant tree structure is modified by limiting a maximum height difference between parent nodes and child nodes of the tree structure to produce the tree list. In addition, the transform coefficients may be quantized based on the quantizing interval to produce quantized transform coefficients, and the modified tree list and the quantized transform coefficients may be arithmeticlly coded.

REFERENCES:
patent: 5321776 (1994-06-01), Shapiro
Kim et al, "New tree structure with conditional height difference for wavelet transform image coding" Electronics Letters Jan. 1995 vol. 31, No. 2.

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