Image processing device for eliminating graininess of image
AssigneeNoritsu Precision Co., Ltd.
InventorKoji Kita
Life of this patent
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Abstract
Provided is an image processing device by which graininess of a target image is eliminated while outlines in the target image are maintained. The image processing device includes a smoothing unit and a weighted averaging unit. The smoothing unit is configured to generate a smooth image by smoothing the target image. The weighted averaging unit is configured to generate a weighted average image by performing weighted averaging of the target image and a difference image. The difference image is an image that is obtained by subtracting the target image from the smooth image.
Claims10
An image processing method for eliminating graininess of a target image, comprising the steps of:
- generating a smooth image by smoothing the target image so that the graininess remains in the smooth image;
- and
- generating a weighted average image by performing weighted averaging of the target image and a difference image using positive mixture ratios respectively to the target image and the difference image, the positive mixture ratios being constant not depending on pixel values of the target image, the difference image being a first image obtained by subtracting the target image from the smooth image or a second image obtained by uniformly adding a constant value to each pixel value of the first image, the positive mixture ratio to the difference image being α, the positive mixture ratio to the target image being 1-α and α>0.5.
An image processing device for eliminating graininess of a target image, comprising:
- a smoothing unit of a central processing unit (CPU) configured to generate a smooth image by smoothing the target image;
- and
- a weighted averaging unit of the CPU configured to generate a weighted average image by performing weighted averaging of the target image and a difference image using positive mixture ratios respectively to the target image and the difference image, the positive mixture ratios being constant not depending on pixel values of the target image, the difference image being a first image obtained by subtracting the target image from the smooth image or a second image obtained by uniformly adding a constant value to each pixel value of the first image, the positive mixture ratio to the difference image being a, the positive mixture ratio to the target image being 1-α and α>0.5.
A non-transitory computer readable medium storing an image processing program for eliminating graininess of a target image, the image processing program causing a computer to execute the steps of:
- generating a smooth image by smoothing the target image;
- and
- generating a weighted average image by performing weighted averaging of the target image and a difference image using positive mixture ratios respectively to the target image and the difference image, the positive mixture ratios being constant not depending on pixel values of the target image, the difference image being a first image obtained by subtracting the target image from the smooth image or a second image obtained by uniformly adding a constant value to each pixel value of the first image, the positive mixture ratio to the difference image being a, the positive mixture ratio to the target image being 1-α and α>0.5.
Dependencies are inferred from the claim text.