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US 7,031,545 B2Granted
Method and apparatus for automatically adjusting sharpening weighting value
OwnerKuo-Jeng Wanginventor
Life of this patent
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Abstract
A method of automatically adjusting sharpening weighting value in an image sharpening process is disclosed. The method utilizes scanning a correction board having a black reference region, a white reference region and a plurality of line pair regions to aid the calculations of the modulation transfer function value and noise value. The method automatically adjusts weighting values of a sharpening function and avoids accompanying noise increase simultaneously in an image sharpening process performed in an image processing apparatus and thereby high quality images with high signal/noise ratio can be provided.
Claims16
A method comprising:
- scanning a correction board having a black reference region, a white reference region and a plurality of line pair regions;
- increasing a sharpening function weighting value;
- calculating a modulation transfer function value by using data generated from scanning said line pair regions and said weighting value;
- comparing said calculated modulation transfer function value with a preset modulation transfer function specification;
- calculating a noise value by using data generated from scanning said black reference region and said white reference region;
- and
- comparing said calculated noise value with a preset noise specification.
4 more elements
A method comprising:
- scanning a correction bard having a black reference region, a white reference region and a plurality of line pair regions;
- increasing a sharpening function weighting;
- calculating a modulation transfer function valve by using data generated from scanning said line pair regions and said sharpening function weighting value;
- comparing said calculated modulation transfer function value with a preset modulation transfer function specification;
- calculating a noise value by using data generated from scanning said black reference region and said white reference region, wherein said modulation transfer function value is over a preset modulation transfer function specification;
- comparing said calculated noise value with a preset noise specification;
- decreasing said sharpening function weighting value when said calculated noise value is over said preset noise specification;
- re-calculating said modulation transfer function value by using said decreased sharpening function weighting value;
- re-comparing said re-calculated modulation transfer function value with said preset modulation transfer function specification;
- re-calculating said noise value;
- and
- re-comparing said re-calculated noise value with said preset noise specification.
9 more elements
A method comprising:
- scanning a correction board having a black reference region, a white reference region and a plurality of line pair regions, wherein each said line pair region comprises at least two sets of line pairs, each line pair having an individual slope and at least two substantially parallel black lines and a white region between said adjacent black lines;
- increasing a sharpening function weighting value;
- calculating a modulation transfer function value by using data generated from scanning said line pair regions and said weighting value;
- comparing said calculated modulation transfer function value with a preset modulation transfer function specification;
- calculating a noise value by using data generated from scanning said black reference region and said white reference region;
- and
- comparing said calculated noise value with a preset noise specification.
4 more elements
A method, comprising:
- scanning a correction board having a black reference region, a white reference region and a line pair region;
- calculating a modulation transfer function value using information generated by the scanning operation of the correction board and further using a weighting value;
- comparing said calculated modulation transfer function value with a preset modulation transfer function specification;
- and
- increasing the weighting value if the calculated modulation transfer function value is less than the preset modulation transfer function value.
2 more elements
An apparatus, comprising:
- means for scanning a correction board having a black reference region, a white reference region and a line pair region;
- means for calculating a modulation transfer function value using information generated by the scanning operation of the correction board and further using a weighting value;
- means for comparing said calculated modulation transfer function value with a preset modulation transfer function specification;
- and
- means for increasing the weighting value if the calculated modulation transfer function value is less than the preset modulation transfer function value.
2 more elements
Dependencies are inferred from the claim text.