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US 5,706,220 AGranted
System and method for implementing the fast wavelet transform
AssigneeLSI Logic Corporation
InventorsManoucher Vafai, Loganath Ramachandran, Mody Lempel
Life of this patent
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Abstract
A system and method implementing a fast wavelet transform by shifting a pair of pixels into a single shift register and using a multimode quadrature mirror filter to eliminate the need of downsampling the filtered signals and to decrease the area required to implement the device on a semiconductor chip.
Claims8
In an integrated circuit device for wavelet transformation, including a shift register and a multimode filter, in a wavelet compression system for multimedia computing;
- a method for transforming a signal of pixels comprising:
- shifting a pair of pixels into a first pair of cells of the shift register and shifting another pair of pixels out of a last pair of cells of the shift register;
- switching the multimode filter to a high-pass mode;
- passing all pixels currently contained in the shift register .through the multimode filter to form a high-pass output;
- switching the multimode filter to a low-pass mode;
- and
- passing all pixels currently contained in the shift register through the multimode filter to form a low-pass output.
4 more elements
A wavelet-based compression system for multimedia computing, the system comprising:
- digitized pixels of a two-dimensional image;
- a clock transmitting clock cycles;
- a shift register into which two of the digitized pixels are shifted per two clock cycles;
- a multimode filter, with a high-pass mode and a low-pass mode, into which the digitized pixels contained in the shift register are transferred each clock cycle;
- and
- a mode input which toggles a multimode filter between the high-pass mode and the low-pass mode once per clock cycle.
3 more elements
Dependencies are inferred from the claim text.