VANISHING POINT DETECTING SYSTEM, VANISHING POINT DETECTING METHOD, AND VANISHING POINT DETECTING PROGRAM
First Claim
Patent Images
1. A vanishing point detecting system comprising:
- a straight line detecting unit that detects a straight line from an image;
a straight line angular variation evaluation value assigning unit that assigns, for each point in a space including at least a portion of the image, when angles of straight lines that pass through the point or through a prescribed range surrounding the point are sparsely distributed over a relatively wide range, a straight line angular variation evaluation value having a larger value; and
a vanishing point detecting unit that, using, as a vanishing point evaluation value, the straight line angular variation evaluation value, detects, as a vanishing point, a point at which the straight line angular variation evaluation value has a relatively large value in comparison with other points.
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Abstract
Disclosed is a vanishing point detecting system that includes a straight line detecting unit, a vanishing point detecting unit, and a vanishing point outputting unit. In the vanishing point detecting unit, a vanishing point is detected with one evaluation index of vanishing point plausibility being whether or not angles of plural straight lines passing through a point in question or a vicinity thereof are sparsely distributed over a relatively wide range.
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Citations
28 Claims
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1. A vanishing point detecting system comprising:
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a straight line detecting unit that detects a straight line from an image; a straight line angular variation evaluation value assigning unit that assigns, for each point in a space including at least a portion of the image, when angles of straight lines that pass through the point or through a prescribed range surrounding the point are sparsely distributed over a relatively wide range, a straight line angular variation evaluation value having a larger value; and a vanishing point detecting unit that, using, as a vanishing point evaluation value, the straight line angular variation evaluation value, detects, as a vanishing point, a point at which the straight line angular variation evaluation value has a relatively large value in comparison with other points. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10)
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3. A vanishing point detecting system comprising:
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a straight line detecting unit that detects straight lines from an image and that assigns a confidence factor as a straight line to each of the straight lines detected; a straight line angular variation evaluation value assigning unit that assigns, for each point in a space including at least a portion of the image, when angles of straight lines that pass through the point or through a prescribed range surrounding the point are sparsely distributed over a relatively wide range, a straight line angular variation evaluation value having a larger value; a vanishing point evaluation value assigning unit that assigns, for each point in a space including at least a portion of the image, when a relatively large number of straight lines pass, based on a confidence factor for straight lines passing through the point or through a prescribed range surrounding the point, a vanishing point evaluation value having a larger value; and a vanishing point detecting unit that detects, as a vanishing point, a point at which the vanishing point evaluation value has a relatively large value;
wherein the vanishing point evaluation value assigning unit, when calculating the vanishing point evaluation value, takes into account the straight line angular variation evaluation value.
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11. A vanishing point detecting method comprising:
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detecting a straight line from an image; assigning, for each point in a space including at least a portion of the image, when angles of straight lines that pass to the point or to a prescribed range surrounding the point are sparsely distributed over a relatively wide range, a straight line angular variation evaluation value having a larger value; and using the straight line angular variation evaluation value as a vanishing point evaluation value, and detecting, as a vanishing point, a point at which the straight line angular variation evaluation value has a relatively large value. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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12. A vanishing point detecting method comprising:
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detecting a straight line from an image together with a confidence factor as a straight line; assigning, for each point in a space including at least a portion of the image, when angles of straight lines that pass to the point or to a prescribed range surrounding the point are sparsely distributed over a relatively wide range, a straight line angular variation evaluation value having a larger value; assigning, for each point in a space including at least a portion of the image, when a relatively large number of straight lines pass, based on a confidence factor for straight lines that pass to the point or to a prescribed range surrounding the point, a vanishing point evaluation value having a larger value; and detecting, as a vanishing point, a point at which the vanishing point evaluation value has a relatively large value; wherein, when calculating the vanishing point evaluation value, the straight line angular variation evaluation value is taken into account.
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20. A program for causing a computer which detects a vanishing point to execute the processing comprising:
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detecting a straight line from an image; assigning, for each point in a space including at least a portion of the image, when angles of straight lines that pass to the point or to a prescribed range surrounding the point are sparsely distributed over a relatively wide range, a straight line angular variation evaluation value having a larger value; and using the straight line angular variation evaluation value as a vanishing point evaluation value, and detecting, as a vanishing point, a point at which the straight line angular variation evaluation value has a relatively large value. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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Specification