Image processing device and method, program recording medium, and imaging system
First Claim
1. An image processing device comprising:
- a filtering unit comprising a plurality of filtering unit stages for filtering an input image;
a plurality of band image signal generating units for generating a plurality of band image signals having different frequency bands from each other from an output image of the filtering unit;
a noise reduction processing unit for performing a noise reduction process of reducing a noise component contained in the plurality of band image signals generated by the band image signal generating units; and
a plurality of image synthesizing units for synthesizing the plurality of band image signals subjected to the noise reduction process;
wherein the image processing device includes a first pixel expansion unit for performing a pixel expansion process of expanding pixels at an outer peripheral part of an image input to one of the plurality of filtering unit stages other than a first stage of the filtering unit, or an image output from one of the plurality of band image signal generating units.
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Accused Products
Abstract
A number of invalid pixels at an outer peripheral part is reduced while suppressing an influence on an image quality such as discontinuity by pixel expansion, and suppressing increase in a number of processing pixels. When sequentially generating a plurality of reduced images having resolutions different from each other by sequentially performing a reduction process on an input image when realizing a noise reduction process using multiresolution transformation, the pixel expansion process of expanding the pixels at the outer peripheral part of the image of the reduced image is performed at least once before performing one of the reduction processes, and the reduced image after the pixel expansion process is further reduced to generate the plurality of reduced images.
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Citations
12 Claims
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1. An image processing device comprising:
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a filtering unit comprising a plurality of filtering unit stages for filtering an input image; a plurality of band image signal generating units for generating a plurality of band image signals having different frequency bands from each other from an output image of the filtering unit; a noise reduction processing unit for performing a noise reduction process of reducing a noise component contained in the plurality of band image signals generated by the band image signal generating units; and a plurality of image synthesizing units for synthesizing the plurality of band image signals subjected to the noise reduction process; wherein the image processing device includes a first pixel expansion unit for performing a pixel expansion process of expanding pixels at an outer peripheral part of an image input to one of the plurality of filtering unit stages other than a first stage of the filtering unit, or an image output from one of the plurality of band image signal generating units. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image processing method comprising:
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performing filtering over plural times with respect to an input image; generating a plurality of band image signals having different frequency bands from each other from a plurality of output images obtained by the filtering of plural times; performing a pixel expansion process of expanding pixels at outer peripheral parts of the plurality of output images obtained by the filtering and at least one image of the plurality of band image signals; performing a noise reduction process of reducing a noise component contained in the plurality of band image signals; and synthesizing the plurality of band image signals subjected to the noise reduction process. - View Dependent Claims (10)
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11. A computer readable storage device having an image processing program stored thereon for causing a computer to execute functions comprising:
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performing filtering over plural times with respect to an input image; generating a plurality of band image signals having different frequency bands from each other from a plurality of output images obtained by the filtering of plural times; performing a pixel expansion process of expanding pixels at outer peripheral parts of the plurality of output images obtained by the filtering and at least one image of the plurality of band image signals; performing a noise reduction process of reducing a noise component contained in the plurality of band image signals; and synthesizing the plurality of band image signals subjected to the noise reduction process. - View Dependent Claims (12)
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Specification