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US 2003/0169935 A1Published application
Image decompression apparatus and method
AssigneeRicoh Company, Ltd.
InventorsYutaka Sano, Akio Matsubara
Life of this patent
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Abstract
In a still image decompression process, operations of respective parts of a still image decompression apparatus are controlled so as to limit the operations into those such that a decompressed image on a specific LL subband is obtained.
Claims23
An image decompression apparatus, comprising:
- an input unit to input a code sequence of wavelet coefficients;
- a decoding unit to decode the input code sequence;
- an inverse-quantization unit to perform inverse-quantization on the decoded wavelet coefficients;
- an inverse-wavelet-transform unit to perform inverse wavelet transform on the inverse-quantized wavelet coefficients so as to obtain pixel values;
- and
- a control unit to control operations of the input unit, the decoding unit, the inverse-quantization unit, and the inverse-quantization unit to limit operations into those such that a decompressed image of a specific LL subband be obtained therefrom.
3 more elements
An image decompression method, comprising:
- a) inputting a code sequence of wavelet coefficients;
- b) decoding the code sequence to generate decoded wavelet coefficients;
- c) performing inverse-quantization on the decoded wavelet coefficients to generate inverse-quantized wavelet coefficients;
- d) performing inverse wavelet transform on inverse-quantized wavelet coefficients to obtain pixel values;
- and
- e) controlling operations of inputting the code sequence, decoding the input code sequence, performing inverse quantization, and performing an inverse wavelet transform to limit the operations to obtain a decompressed image of a specific LL subband.
3 more elements
An article of manufacture having one or more recordable media storing instructions which, when
- executed by a system, cause the system to:
- a) input a code sequence of wavelet coefficients;
- b) decode the code sequence to generate decoded wavelet coefficients;
- c) perform inverse-quantization on the decoded wavelet coefficients to generate inverse-quantized wavelet coefficients;
- d) perform inverse wavelet transform on inverse-quantized wavelet coefficients to obtain pixel values;
- and
- e) control execution of instructions to input the code sequence, decode the input code sequence, perform inverse quantization, and perform an inverse wavelet transform to limit the operations to obtain a decompressed image of a specific LL subband.
4 more elements
Dependencies are inferred from the claim text.