Methods and apparatus for calibrating and/or adjusting the arrangement of cameras in a camera pair
First Claim
1. A calibration apparatus, comprising:
- a calibration target including a grid pattern, said grid pattern including a plurality of grid elements, each grid element occupying an area of a grid, said grid pattern including subsets of grid elements of different colors;
a camera pair mount for supporting a camera pair facing said calibration target, said camera pair including a first camera and a second camera, said first and second cameras being positioned adjacent one another facing said calibration target;
a display; and
a processor configured to;
generate a calibration image by combining a first image captured by said first camera on a second image captured by the second camera; and
control the display to display the generated calibration image.
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Abstract
Methods and apparatus for checking the alignment and/or spacing of cameras of a camera pair, e.g., stereoscopic camera pair, are described. Images of a calibration target are captured by first and second cameras of a camera pair being calibrated The captured first and second images, which may correspond to all or a portion of the calibration target, are combined in accordance with the invention to generate a calibration image which is then displayed to an operator of the calibration apparatus including the calibration target. Given the position of at least some different color grid elements in the calibration target, when proper camera spacing and optical axis alignment of the cameras is achieved, the overlaid image will include an overlay of two different color image grid elements resulting in the generated calibration image including grid elements of a different color than that of the overlaid grid elements.
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Citations
21 Claims
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1. A calibration apparatus, comprising:
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a calibration target including a grid pattern, said grid pattern including a plurality of grid elements, each grid element occupying an area of a grid, said grid pattern including subsets of grid elements of different colors; a camera pair mount for supporting a camera pair facing said calibration target, said camera pair including a first camera and a second camera, said first and second cameras being positioned adjacent one another facing said calibration target; a display; and a processor configured to; generate a calibration image by combining a first image captured by said first camera on a second image captured by the second camera; and control the display to display the generated calibration image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method, comprising:
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operating first and second cameras of a camera pair, mounted on a camera mount and facing a calibration target, said calibration target being a physical object, said calibration target including a grid pattern to capture first and second images, respectively, of said grid pattern, said grid pattern including a plurality of grid elements, each grid element occupying an area of a grid, said grid pattern including subsets of grid elements of different colors; operating a processor to generate a calibration image by combining a first image captured by said first camera on a second image captured by the second camera; and displaying the generated calibration image. - View Dependent Claims (18, 19, 20)
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21. An apparatus, comprising:
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a calibration target including a grid pattern, said calibration target being a physical object, said grid pattern including a plurality of grid elements, each grid element occupying an area of a grid, said plurality of grid elements including grid elements of a first color, grid elements of a second color, grid elements of a third color and grid elements of a fourth color, said first, second, third and fourth colors being different; a camera pair mount for supporting a camera pair facing said calibration target, said camera pair including a first camera and a second camera, said first and second cameras being positioned adjacent one another facing said calibration target; a display; and a processor configured to; generate a calibration image by combining a first image captured by said first camera with a second image captured by the second camera by superimposing the first image on the second image; and control the display to display the generated calibration image.
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Specification