Method, apparatus and a unit for image conversion
AssigneeKoninklijke Philips Electronics N.V.
InventorGerard De Haan
Life of this patent
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Abstract
An image conversion unit for converting a first image with a first resolution into a second image with a second resolution, the second resolution being higher than the first resolution being higher than the first resolution is disclosed. The image conversion unit comprises a noise generator for generating noise and a combining unit arranged to add the noise to the second image. Preferably the noise that is added comprises spectral components which are in a part of a frequency spectrum which is above the Nyquist frequency of the first image. Optionally the image conversion unit comprises a noise measurement unit to control the noise generator. FIG. 5A+5B+5C
Claims10
An image conversion unit for converting a first image with a first resolution into a second image with a second resolution, the second resolution being higher than the first resolution, the image conversion unit comprising:
- an image converter for converting a first image with a first resolution into an intermediate image with a second resolution, the second resolution being higher than the first resolution;
- a noise adder for adding noise to the intermediate image, wherein the said noise comprises spectral components that are in a part of a frequency spectrum that is above the Nyquist frequency of the first image;
- and
- a spatial enhancement filter for enhancing structures of said intermediate image which is based on the first image and which has the second resolution,
- wherein a combination of said noise adder and said spatial enhancement filter forms said second image.
A method of converting a first image with a first resolution into a second image with a second resolution, the second resolution being higher than the first resolution, the method comprising acts of:
- converting a first image with a first resolution into an intermediate image with a second resolution, the second resolution being higher than the first resolution;
- adding noise to the intermediate image, wherein the said noise comprises spectral components that are in a part of a frequency spectrum that is above the Nyquist frequency of the first image;
- and
- enhancing structures of the intermediate image which is based on the first image and which has the second resolution, wherein a combination of said adding noise act and said enhancing structures act forms said second image.
An image processing apparatus comprising:
- receiving means for receiving a signal corresponding to a first image, said first image having a first resolution;
- an image conversion unit for converting the first image into an intermediate image having a second resolution greater than said first resolution;
- a noise adder for adding noise to the intermediate image, said noise comprising spectral components that are in a part of a frequency spectrum that is above the Nyquist frequency of the first image;
- and
- a spatial enhancement filter for enhancing structures of said noise-added intermediate image which is based on the first image and which has the second resolution, thereby forming a second image.
Dependencies are inferred from the claim text.