Correcting device and method for perspective transformed document images
First Claim
1. A correcting device for a perspective transformed document image, said correcting device comprising.a horizontal vanishing point determining unit, for detecting a horizontal vanishing point of the perspective transformed document image;
- a vertical vanishing point determining unit, for detecting a vertical vanishing point of the perspective transformed document image; and
a perspective transformation correcting and converting unit, for correcting the perspective transformed document image;
wherein the horizontal vanishing point determining unit comprises a direct horizontal line segment detecting unit, an indirect horizontal line segment detecting unit and a horizontal vanishing point detecting unit, and wherein the horizontal vanishing point detecting unit detects a horizontal vanishing point in accordance with direct horizontal line segments detected by the direct horizontal line segment detecting unit and indirect horizontal line segments detected by the indirect horizontal line segment detecting unit.
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Abstract
This invention provides a correcting device and a correcting method for perspective transformation of document images. The correcting device comprises a horizontal vanishing point determining unit, for detecting a horizontal vanishing point of the perspective transformed document image; a vertical vanishing point determining unit, for detecting a vertical vanishing point of the perspective transformed document image; and a perspective transformation correcting and converting unit, for correcting the perspective transformed document image; wherein the horizontal vanishing point determining unit comprises a direct horizontal line segment detecting unit, an indirect horizontal line segment detecting unit and a horizontal vanishing point detecting unit, and wherein the horizontal vanishing point detecting unit detects a horizontal vanishing point in accordance with a direct horizontal line segment detected by the direct horizontal line segment detecting unit and an indirect horizontal line segment detected by the indirect horizontal line segment detecting unit.
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Citations
20 Claims
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1. A correcting device for a perspective transformed document image, said correcting device comprising.
a horizontal vanishing point determining unit, for detecting a horizontal vanishing point of the perspective transformed document image; -
a vertical vanishing point determining unit, for detecting a vertical vanishing point of the perspective transformed document image; and a perspective transformation correcting and converting unit, for correcting the perspective transformed document image; wherein the horizontal vanishing point determining unit comprises a direct horizontal line segment detecting unit, an indirect horizontal line segment detecting unit and a horizontal vanishing point detecting unit, and wherein the horizontal vanishing point detecting unit detects a horizontal vanishing point in accordance with direct horizontal line segments detected by the direct horizontal line segment detecting unit and indirect horizontal line segments detected by the indirect horizontal line segment detecting unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14)
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12. A correcting device for a perspective transformed document image, said correcting device comprising:
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a horizontal vanishing point determining unit, for detecting a horizontal vanishing point of the perspective transformed document image; a vertical vanishing point determining unit, for detecting a vertical vanishing point of the perspective transformed document image; and a perspective transformation correcting and converting unit, for correcting the perspective transformed document image; wherein the vertical vanishing point determining unit comprises a direct vertical line segment detecting unit, an indirect vertical line segment detecting unit and a vertical vanishing point detecting unit, and wherein the vertical vanishing point detecting unit detects a vertical vanishing point in accordance with direct vertical line segments detected by the direct vertical line segment detecting unit and indirect vertical line segments detected by the indirect vertical line segment detecting unit. - View Dependent Claims (15, 16, 17, 18)
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19. A correcting method for a perspective transformed document image, said correcting method comprising:
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a horizontal vanishing point determining step, for detecting a horizontal vanishing point of the perspective transformed document image; a vertical vanishing point determining step, for detecting a vertical vanishing point of the perspective transformed document image; and a perspective transformation correcting and converting step, for correcting the perspective transformed document image; wherein the horizontal vanishing point determining step comprises a direct horizontal line segment detecting step, an indirect horizontal line segment detecting step and a horizontal vanishing point detecting step, and wherein the horizontal vanishing point detecting step detects a horizontal vanishing point in accordance with a direct horizontal line segment detected by the direct horizontal line segment detecting step and an indirect horizontal line segment detected by the indirect horizontal line segment detecting step.
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20. A correcting method for a perspective transformed document image, said correcting method comprising:
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a horizontal vanishing point determining step, for detecting a horizontal vanishing point of the perspective transformed document image; a vertical vanishing point determining step, for detecting a vertical vanishing point of the perspective transformed document image; and a perspective transformation correcting and converting step, for correcting the perspective transformed document image; wherein the vertical vanishing point determining step comprises a direct vertical line segment detecting step, an indirect vertical line segment detecting step and a vertical vanishing point detecting step, and wherein the vertical vanishing point detecting step detects a vertical vanishing point in accordance with a direct vertical line segment detected by the direct vertical line segment detecting step and an indirect vertical line segment detected by the indirect vertical line segment detecting step.
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Specification