Method and apparatus for visually optimized compression parameters
First Claim
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1. A method of generating a plurality of quantization parameter sets for compressing a digital image to different rates comprising the steps of:
- a) providing characteristics of an intended display medium;
b) specifying a plurality of threshold viewing distances from the display medium;
c) generating a plurality of quantization parameter sets, one for each threshold viewing distance, using a human visual system model; and
, d) indexing each quantization parameter set by the corresponding threshold viewing distance.
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Abstract
A method of generating a plurality of quantization parameter sets for compressing a digital image to different rates, the method comprises the steps of providing characteristics of an intended display medium; specifying a plurality of threshold viewing distances from the display medium; generating a plurality of quantization parameter sets, one for each threshold viewing distance, using a human visual system model; and, indexing each quantization parameter set by the corresponding threshold viewing distance.
71 Citations
6 Claims
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1. A method of generating a plurality of quantization parameter sets for compressing a digital image to different rates comprising the steps of:
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a) providing characteristics of an intended display medium;
b) specifying a plurality of threshold viewing distances from the display medium;
c) generating a plurality of quantization parameter sets, one for each threshold viewing distance, using a human visual system model; and
,d) indexing each quantization parameter set by the corresponding threshold viewing distance. - View Dependent Claims (2, 3, 4, 5, 6)
(e) compressing the digital image with the plurality of the quantization parameter sets to generate a plurality of compressed images, each with a corresponding compression rate.
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3. A method as in claim 2 further comprising the step of:
(f) forming a rate-distortion characteristic curve, where each compressed rate is associated with the corresponding quantization parameter set index.
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4. A method as in claim 1 further comprising using a JPEG quantization table as the quantization parameter set.
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5. A method as in claim 2 further comprising using a JPEG quantization table as the quantization parameter set and further comprising using JPEG compression standard to compress the digital image.
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6. A method as in claim 3 further comprising using a JPEG quantization table as the quantization parameter set and further comprising using JPEG compression standard to produce the compressed rate.
Specification
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Current AssigneeEastman Kodak Company
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Original AssigneeEastman Kodak Company
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InventorsRabbani, Majid, Honsinger, Chris W., Jones, Paul W.
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Primary Examiner(s)Grant, II, Jerome
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Application NumberUS09/223,073Time in Patent Office1,148 DaysField of Search382/251, 382/250, 382/248, 382/246, 382/276, 382/280, 382/232, 348/420US Class Current382/251CPC Class CodesG06T 9/007 Transform coding, e.g. disc...
