Image correcting device, method for creating corrected image, correction table creating device, method for creating correction table, program for creating correction table, and program for creating corrected image
First Claim
Patent Images
1. An image correcting device for creating a corrected image through geometrical correction of an input image, comprising:
- an input interface configured to input the input image;
a memory configured to store the input image;
a geometrical correcting circuit configured to subject the input image stored in the memory to geometrical correction by;
calculating a pair of angles (θ
, φ
) which corresponds to each pixel position (u, v) on an output image as the corrected image;
calculating a light direction (X, Y, Z) based on a line of intersection between a plane obtained by rotating a YZ plane by the angle θ
about Y axis and a plane obtained by rotating an XZ plane by the angle φ
about X axis, in a three dimensional Cartesian coordinate system with an origin at a projection center of the input image;
calculating a position on the input image corresponding to the light direction, as a resampling position; and
associating the resampling position with the pixel position on the output image; and
an output interface configured to output the input image corrected by the geometrical correcting circuit, as the corrected image,wherein a ratio of a first angle change rate of each of the angles (θ
, φ
) at the edge of the output image to a second angle change rate of each of the angles (θ
, φ
) at the center of the output image is within a predetermined numerical range.
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Accused Products
Abstract
An image correcting device includes an image input section, image storage section, correction table storage section, geometry correcting section subjecting an input image to geometrical correction based on a correction table, and image output section outputting the input image as a corrected image. The table is created by: calculating a pair of angles (θ, φ) corresponding to each pixel position on the output image as the corrected image; calculating a light direction based on an intersection line between a plane obtained by rotating a YZ plane by angle θ about Y axis and that by rotating an XZ plane by angle φ about X axis, in three dimensional Cartesian coordinate system with origin at a projection center of the input image; calculating a position on the input image corresponding to the light direction, as a resampling position; and associating the resampling position with the pixel position on the output image.
9 Citations
7 Claims
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1. An image correcting device for creating a corrected image through geometrical correction of an input image, comprising:
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an input interface configured to input the input image; a memory configured to store the input image; a geometrical correcting circuit configured to subject the input image stored in the memory to geometrical correction by;
calculating a pair of angles (θ
, φ
) which corresponds to each pixel position (u, v) on an output image as the corrected image;
calculating a light direction (X, Y, Z) based on a line of intersection between a plane obtained by rotating a YZ plane by the angle θ
about Y axis and a plane obtained by rotating an XZ plane by the angle φ
about X axis, in a three dimensional Cartesian coordinate system with an origin at a projection center of the input image;
calculating a position on the input image corresponding to the light direction, as a resampling position; and
associating the resampling position with the pixel position on the output image; andan output interface configured to output the input image corrected by the geometrical correcting circuit, as the corrected image, wherein a ratio of a first angle change rate of each of the angles (θ
, φ
) at the edge of the output image to a second angle change rate of each of the angles (θ
, φ
) at the center of the output image is within a predetermined numerical range. - View Dependent Claims (2, 3)
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4. A method of creating a corrected image through geometrical correction of an input image, comprising the steps of:
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inputting the input image; storing the input image; subjecting the input image stored in the image storage section to geometrical correction by;
calculating a pair of angles (θ
, φ
) which corresponds to each pixel position (u, v) on an output image as the corrected image;
calculating a light direction (X, Y, Z) based on a line of intersection between a plane obtained by rotating a YZ plane by the angle θ
about Y axis and a plane obtained by rotating an XZ plane by the angle φ
about X axis, in a three dimensional Cartesian coordinate system with an origin at a projection center of the input image;
calculating a position on the input image corresponding to the light direction, as a resampling position; and
associating the resampling position with the pixel position on the output image; andoutputting the input image corrected in the step of geometrical correction as the corrected image, wherein a ratio of a first angle change rate of each of the angles (θ
, φ
) at the edge of the output image to a second angle change rate of each of the angles (θ
, φ
) at the center of the output image is within a predetermined numerical range. - View Dependent Claims (5, 6, 7)
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Specification
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Current AssigneeHitachi Information & Telecommunication Engineering, Ltd. (Hitachi, Ltd.)
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Original AssigneeHitachi Information & Communication Engineering Limited (Hitachi, Ltd.)
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InventorsMinakawa, Tsuyoshi, Hamada, Tatsuzo
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Primary Examiner(s)Allison, Andrae S
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Application NumberUS13/035,537Publication NumberTime in Patent Office1,054 DaysField of Search382/103, 382/254, 382/274, 382/295, 348/36, 348/40, 348/39US Class Current382/274CPC Class CodesG06T 3/047 Fisheye or wide-angle trans...G06T 3/12 Panospheric to cylindrical ...
