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US 7,889,280 B2Granted
Image processing apparatus and method thereof
AssigneeCanon Kabushiki Kaisha
InventorSeiji Osawa
Life of this patent
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Abstract
Chroma correction is executed in consideration of the area effect of colors. To this end, an input image is segmented into a plurality of regions as sets of pixels having similar feature amounts, and a size evaluation value of the each segmented regions is calculated based on the number of pixels and a shape of the each segmented region. Chroma correction is applied to the input image to weaken correction as the region has a larger size evaluation value.
Claims14
An image processing apparatus comprising:
- a segmentation unit, arranged to segment an input image into a plurality of regions as sets of pixels having similar feature amounts;
- a calculator, arranged to calculate a size evaluation value V of an apparent size of each region segmented by the segmentation unit based on a number of pixels S and a shape of the each region, wherein the apparent size indicates a visual size of the region in the input image;
- and
- a corrector, arranged to perform chroma emphasis correction on the input image to weaken correction as a region has a larger size evaluation value V,
- wherein the calculator calculates the size evaluation value V using a dimension H in a vertical direction and a dimension W in a horizontal direction of the region as the shape, and a numerical formula which uses the number of pixels S, the dimension H, and the dimension W, so that the size evaluation value V grows large when a difference between the dimension H and the dimension W becomes small.
2 more elements
An image processing method comprising:
- using a processor to perform the steps of:
- segmenting an input image into a plurality of regions as sets of pixels having similar feature amounts;
- calculating a size evaluation value V of an apparent size of each segmented region based on a number of pixels S and a shape of the region, wherein the apparent size indicates a visual size of the region in the input image;
- and
- performing chroma emphasis correction on the input image to weaken correction as a region has a larger size evaluation value V,
- wherein the calculating step calculates the size evaluation value V using a dimension H in a vertical direction and a dimension W in a horizontal direction of the region as the shape, and a numerical formula which uses the number of pixels S, the dimension H, and the dimension W, so that the size evaluation value V grows large when a difference between the dimension H and the dimension W becomes small.
3 more elements
Dependencies are inferred from the claim text.