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US 7,254,276 B2Granted
Noise reduction in image capturing apparatus
AssigneeFUJIFILM Corporation
InventorsMasahiko Sugimoto, Kazuhiko Takemura, Kenkichi Hayashi, Koichi Sakamoto, Masaya Tamaru, Hirokazu Kobayashi
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Abstract
An image capturing apparatus for capturing an image of a subject; has: an image pick-up unit for acquiring the image; and a noise reduction unit which removes a frequency component of a color difference signal of the image corresponding to a frequency component of a luminance signal based on the frequency component of the luminance signal of the image.
Claims13
An image capturing apparatus for capturing an image of a subject, comprising:
- an image pick-up unit for acquiring said image;
- a noise reduction unit which removes a frequency component of a color difference signal of said image corresponding to a frequency component of a luminance signal based on said frequency component of said luminance signal of said image;
- and
- a DCT transforming unit which applies a discrete-cosine-transform (DCT) to said luminance signal and said color difference signal,
- wherein said noise reduction unit removes said frequency component of said color difference signal, to which said DCT is applied, corresponding to said frequency component of said luminance signal when said frequency component of said luminance signal, to which said DCT is applied, is smaller than a previously provided threshold value.
2 more elements
A computer readable medium storing thereon a computer program to process an image, the computer program comprising:
- an acquiring module for acquiring an image to be processed by said computer;
- a noise reduction module for removing a frequency component of a color difference signal of said image corresponding to a frequency component of a luminance signal based on said frequency component of said luminance signal of said image;
- and
- a DCT transforming module which applies a discrete-cosine-transform (DCT) to said luminance signal and said color difference signal,
- wherein said noise reduction module removes said frequency component of said color difference signal, to which said DCT is applied, corresponding to said frequency component of said luminance signal when said frequency component of said luminance signal, to which said DCT is applied, is smaller than a previously provided threshold value.
2 more elements
An image capturing apparatus for capturing an image of a subject, comprising:
- an image pick-up unit for acquiring said image;
- and
- a noise reduction unit which removes a frequency component of a color difference signal of said image corresponding to a frequency component of a luminance signal based on said frequency component of said luminance signal of said image,
- wherein said noise reduction unit removes said frequency component of said color difference signal corresponding to said frequency component of said luminance signal based on said frequency component of said luminance signal and said frequency component of said color difference signal, which corresponds to said frequency component of said luminance signal, and
- wherein said noise reduction unit removes said frequency component of said color difference signal corresponding to said frequency component of said luminance signal, when a product of said frequency component of said luminance signal and said frequency component of said color difference signal, which corresponds to said frequency component of said luminance signal, is smaller than a previously provided threshold value.
2 more elements
An image capturing apparatus for capturing an image of a subject, comprising:
- an image pick-up unit for acquiring said image;
- a noise reduction unit which removes a frequency component of a color difference signal of said image corresponding to a frequency component of a luminance signal based on said frequency component of said luminance signal of said image;
- and
- a DCT transforming unit which applies a discrete-cosine-transform (DCT) to said luminance signal and said color difference signal,
- wherein said noise reduction unit removes said frequency component of said color difference signal that corresponds to said frequency component of said luminance signal when said frequency component of said luminance signal is smaller than a previously provided threshold value, and
- wherein said noise reduction unit removes said frequency component of said color difference signal, to which said DCT is applied, corresponding to said frequency component of said luminance signal when a product of said frequency component of said luminance signal, to which said DCT is applied, and said frequency component of said color difference signal, to which said DCT is applied, corresponding to said frequency component of said luminance signal is smaller than said threshold value.
3 more elements
Dependencies are inferred from the claim text.