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Abstract

An image compression method using a wavelet transform is provided. The image compression method includes a first wavelet transform process, a storage process, a second wavelet transform process, a quantization process and an entropy encoding process. The first wavelet transform process wavelet-transforms image data as many as a reference wavelet transform number of times in any one direction of a row-direction or a column-direction, to thereby output first low-frequency wavelet transform data and first high-frequency wavelet transform data. The second wavelet transform process wavelet-transforms the first low-frequency wavelet transform data and the last first high-frequency wavelet transform data which are stored in a memory as many as the reference wavelet transform number of times in a direction differing from that performed in the first wavelet transform process, to thereby output second low-frequency wavelet transform data and second high-frequency wavelet transform data. Accordingly, since an amount of calculation for a wavelet operation during wavelet transforming becomes less, the wavelet transform can be performed in a short time, a size of a wavelet transform circuit can be made compact, a quantity of data to be stored in the memory can be diminished, and an exchange of data with a memory can be reduced, to thereby lessen a power consumption.

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