Method and apparatus for specifying quantization based upon the human visual system
AssigneeRicoh Company, Ltd.
InventorsEdward L. Schwartz, Michael J. Gormish, Martin Boliek, Kok Gi Wu
Life of this patent
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Abstract
A method and apparatus for specifying quantization based upon the human visual system is described. In one embodiment, the method comprises specifying scalar quantization for application to one or more bit planes of luminance information in image data using a human visual system (HVS) weighting and quantizing bit planes of the luminance information in the image data based on specified scalar quantization.
Claims22
A method, comprising:
- specifying scalar quantization for application to one or more bit planes of luminance information in image data using a human visual system (HVS) weighting based on viewing distance of a predetermined number of pixels, including specifying at least one of 1HH, 1HL, and 1LH subbands of a bit plane to be truncated;
- and
- quantizing bit planes of the luminance information in the image data based on specified scalar quantization.
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 perform a method, comprising:
- specifying scalar quantization for application to one or more bit planes of luminance information in image data using a human visual system (HVS) weighting based on viewing distance of a predetermined number of pixels, including specifying at least one of 1HH, 1HL, and 1LH subbands of a bit plane to be truncated;
- and
- quantizing bit planes of the luminance information in the image data based on specified scalar quantization.
An apparatus, comprising:
- a controller to specify scalar quantization for application to one or more bit planes of luminance information in image data using a human visual system (HVS) weighting based on viewing distance of a predetermined number of pixels, including specifying at least one of 1HH, 1HL, and 1LH subbands of a bit plane to be truncated;
- and
- a compressor coupled to the controller to compress the image data, the compressor including a quantizer to quantize bit planes of the luminance information in the image data based on specified scalar quantization.
An apparatus, comprising:
- means for specifying scalar quantization for application to one or more bit planes of luminance information in image data using a human visual system (HVS) weighting based on viewing distance of a predetermined number of pixels, including specifying at least one of 1HH, 1HL, and 1LH subbands of a bit plane to be truncated;
- and
- means for quantizing bit planes of the luminance information in the image data based on specified scalar quantization.
Dependencies are inferred from the claim text.