Method and apparatus for performing scalar quantization with a power of two step size
AssigneeRicoh Company, Ltd.
InventorsEdward L. Schwartz, Michael J. Gormish, Martin Boliek, Kok Gi Wu
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Abstract
A method and apparatus for performing scalar quantization with a power of two step size is described. In one embodiment, the method comprises receiving a sequence of image data to compress and specifying scalar quantization with a power of two step size using three bit values to apply to the sequence of image data.
Claims24
A computer implemented method comprising:
- receiving a sequence of image data to compress;
- specifying scalar quantization with a power of two step size using only three bit values to represent a quantizer that is applied to the sequence of image data, three bit values specifying a number of magnitude wavelet transform coefficient bitplanes to be truncated during the quantization, each of the magnitude wavelet transform coefficient bitplanes representing a magnitude level associated with wavelet trandform coefficients, the three bits indicating that all bitplanes are to be truncated when the three bits are in predetermined logic states.
An apparatus comprising:
- means for receiving a sequence of image data to compress;
- means for specifying scalar quantization with a power of two step size using only three bit values to represent a quantizer that is applied to the sequence of image data, the three bit values specifying a number of magnitude wavelet transform coefficient bitplanes to be truncated during the quantization, each of the magnitude wavelet transform coefficients bitplanes representing a magnitude level associated with wavelet tranform coefficients, the three bits indicating that all bitplanes are to be truncated when the three bits are in predetermined logic states.
An apparatus for compressing image data comprising:
- a controller to specify scalar quantization with a power of two step size using three bit values to be applied to the image data;
- a compressor coupled to the controller to compress a sequence of image data to create compressed data, the compressor comprising a quantizer responsive to the scalar quantization specified by the controller to quantize the image data, the quantizer represented by only three bit valus, the three bit values specifying a number of magnitude wavelet transform coefficient bitplanes to be truncated during the quantization, each of the magnitude wavelet transform coefficient bitplanes representing a magnitude level associated with wavelet transform coefficients, the three bits indicating that all bitplanes are to be truncated when the three bits are in predetermined logic states.
An article of manufacture comprising one or more computer recordable media having executable instructions stored thereon which, when executed by a computer, cause the computer to:
- receive a sequence of image data to compress;
- specify scalar quantization with a power of two step size using only three bit values to represent a quantizer that is applied to the sequence of image data, the three bit values specifying a number of magnitude wavelet transform coefficient bitplanes to be truncated during the quantization, each of the magnitude wavelet transform coefficient bitplanes representing a magnitude level associated with wavelet transform coefficients, the three bits indicating that all bitplanes are to be truncated when the three bits are in predetermined logic states.
Dependencies are inferred from the claim text.