Edge evaluation method, edge detection method, image correction method, and image processing system
AssigneeShimadzu Corporation
InventorShoichi Okamura
Life of this patent
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Abstract
An image processing system of this invention includes a variation calculator for calculating a variation in pixel value of each pixel relative to adjacent pixels, and an edge degree calculating device for calculating, for one arbitrary pixel, an edge degree which expresses numerically a probability of the one pixel being an edge, based on variations of a peripheral pixel group consisting of the one pixel and surrounding pixels. According to the image processing system constructed in this way, whether edges or not can be evaluated with high accuracy even when the pixels undergoing noise.
Claims18
An edge evaluation method for evaluating probabilities that pixels constituting image data are edges, comprising:
- a variation calculating step for calculating a variation in pixel value of each pixel relative to adjacent pixels;
- and
- an edge degree calculating step for calculating, for one arbitrary pixel, an edge degree which expresses numerically a probability of the one pixel being an edge, based on variations of a peripheral pixel group consisting of the one pixel and surrounding pixels;
- wherein, when a total of absolute values substituting for the variations of the peripheral pixel group is regarded as a variation range summation;
- and
- an absolute value of a total of the variations per se of the peripheral pixel group is regarded as a variation increase and decrease range;
- the edge degree is a ratio of the variation increase and decrease range to the variation range summation, or a value corresponding to the ratio.
An edge detection method for detecting that pixels constituting image data are edges, comprising:
- a variation calculating step for calculating a variation in pixel value of each pixel relative to adjacent pixels;
- an edge degree calculating step for calculating, for one arbitrary pixel, an edge degree which expresses numerically a probability of the one pixel being an edge, based on variations of a peripheral pixel group consisting of the one pixel and surrounding pixels;
- and
- an edge detecting step for determining, based on a result of the edge degree being compared with a threshold value, that the one pixel is an edge;
- wherein, when a total of absolute values substituting for the variations of the peripheral pixel group is regarded as a variation range summation;
- and
- an absolute value of a total of the variations per se of the peripheral pixel group is regarded as a variation increase and decrease range;
- the edge degree is a ratio of the variation increase and decrease range to the variation range summation, or a value corresponding to the ratio.
An image correction method for correcting pixel values of pixels constituting image data, comprising:
- a variation calculating step for calculating a variation in pixel value of each pixel relative to adjacent pixels;
- an edge degree calculating step for calculating, for one arbitrary pixel, an edge degree which expresses numerically a probability of the one pixel being an edge, based on variations of a peripheral pixel group consisting of the one pixel and surrounding pixels;
- and
- an image correcting step for correcting a pixel value of the one pixel based on the edge degree;
- wherein, when a total of absolute values substituting for the variations of the peripheral pixel group is regarded as a variation range summation;
- and
- an absolute value of a total of the variations per se of the peripheral pixel group is regarded as a variation increase and decrease range;
- the edge degree is a ratio of the variation increase and decrease range to the variation range summation, or a value corresponding to the ratio.
An image processing system for evaluating probabilities that pixels constituting image data are edges, comprising:
- a variation calculating device for calculating a variation in pixel value of each pixel relative to adjacent pixels;
- and
- an edge degree calculating device for calculating, for one arbitrary pixel, an edge degree which expresses numerically a probability of the one pixel being an edge, based on variations of a peripheral pixel group consisting of the one pixel and surrounding pixels;
- wherein, when a total of absolute values substituting for the variations of the peripheral pixel group is regarded as a variation range summation;
- and
- an absolute value of a total of the variations per se of the peripheral pixel group is regarded as a variation increase and decrease range;
- the edge degree is a ratio of the variation increase and decrease range to the variation range summation, or a value corresponding to the ratio.
Dependencies are inferred from the claim text.