SYSTEM AND METHOD FOR FILTERING IMAGE NOISE
First Claim
1. A system for filtering image noise, the system comprising:
- an image acquiring module for acquiring an image;
a gray-scale converter for converting gray-scale values of the image, and for sharpening the image;
an intersecting point selecting module for defining axes perpendicular to image borders, for determining gray-scale values of axis points, for selecting intersecting points between the image borders and the axes, for creating an object points set, and for inputting the intersecting points into the object points set; and
a noise filtering module for fitting a geometric character according to the object points set and defining a tolerance threshold value, for calculating a distance from each intersecting point in the object points set to the geometric character, for determining whether the distance is larger than the defined tolerance threshold value, and for marking the intersecting point as a noise and deleting the intersecting point if the distance is larger than the defined tolerance threshold value.
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Accused Products
Abstract
A method for filtering image noise includes the steps of: acquiring an image; converting gray-scale values of the image and sharpening the image; defining axes perpendicular to image borders and selecting intersecting points between the axes and the image border; creating an object points set and inputting all the intersecting points into the object points set; fitting a geometric character according to the object points set; defining a tolerance threshold value; selecting an intersecting point from the object points set; calculating a distance from the selected intersecting point to the geometric character; determining whether the distance is larger than the defined tolerance threshold value; marking the selected intersecting point as a noise if the distance is larger than the defined tolerance threshold value; and deleting the selected intersecting point from the object points set. A related method is also disclosed.
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Citations
19 Claims
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1. A system for filtering image noise, the system comprising:
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an image acquiring module for acquiring an image;
a gray-scale converter for converting gray-scale values of the image, and for sharpening the image;
an intersecting point selecting module for defining axes perpendicular to image borders, for determining gray-scale values of axis points, for selecting intersecting points between the image borders and the axes, for creating an object points set, and for inputting the intersecting points into the object points set; and
a noise filtering module for fitting a geometric character according to the object points set and defining a tolerance threshold value, for calculating a distance from each intersecting point in the object points set to the geometric character, for determining whether the distance is larger than the defined tolerance threshold value, and for marking the intersecting point as a noise and deleting the intersecting point if the distance is larger than the defined tolerance threshold value. - View Dependent Claims (2, 3, 4)
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5. A method for filtering image noise, the method comprising the steps of:
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acquiring an image;
converting gray-scale values of the image and sharpening the image;
defining axes perpendicular to image borders and selecting intersecting points between the axes and the image border;
creating an object points set and inputting all the intersecting points into the object points set;
fitting a geometric character according to the object points set;
defining a tolerance threshold value;
selecting an intersecting point from the object points set;
calculating a distance from the selected intersecting point to the geometric character;
determining whether the distance is larger than the defined tolerance threshold value;
marking the selected intersecting point as a noise if the distance is larger than the defined tolerance threshold value; and
deleting the selected intersecting point from the object points set. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for filtering image noise, the system comprising:
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an image acquiring module for acquiring an image;
a gray-scale converter for converting gray-scale values of the image;
an intersecting point selecting module for defining axes perpendicular to image borders, for selecting intersecting points between the image borders and the axes, for creating an object points set, and for inputting the intersecting points into the object points set; and
a noise filtering module for fitting a geometric character according to the object points set.
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Specification