| 主权项 |
1. An image projection system for projecting a first divided image to a first area of an image projection area using a first image projection device and projecting a second divided image to a second area, adjacent to the first area, of the image projection area using a second image projection device to project a large image including the first divided image and the second divided image to the image projection area, the image projection system comprising:
an image capturing device that captures, with a lens, an image of a first checker sheet including a checkered pattern including horizontal lines and vertical lines, the first checker sheet being placed on the image projection area; a corrector that corrects a distortion, caused by the lens, of a first checker sheet image as an image of the first checker sheet captured by the image capturing device, the distortion being corrected by use of an inside parameter of the image capturing device; a checker intersection coordinate detector that detects checker intersection coordinates as intersection coordinates of the horizontal lines and the vertical lines in the post-correction first checker sheet image; a first transform matrix calculator that calculates a first transform matrix usable to projection-transform the detected checker intersection coordinates into checker intersection coordinates uniformly or substantially uniformly distributed in the image projection area; a spatial code image generator that creates a first spatial code image as a gray scale image from a first positive image and a first negative image projected to the first area by the first image projection device, the first positive image and the first negative image including a gray code pattern that has a luminance value varying in a horizontal direction, creates a second spatial code image as a gray scale image from a second positive image and a second negative image projected to the first area by the first image projection device, the second positive image and the second negative image including a gray code pattern that has a luminance value varying in a vertical direction, creates a third spatial code image as a gray scale image from a third positive image and a third negative image projected to the second area by the second image projection device, the third positive image and the third negative image including a gray code pattern that has a luminance value varying in the horizontal direction, and creates a fourth spatial code image as a gray scale image from a fourth positive image and a fourth negative image projected to the second area by the second image projection device, the fourth positive image and the fourth negative image including a gray code pattern that has a luminance value varying in the vertical direction; a border coordinate acquirer that acquires a plurality of first border coordinates in the first spatial code image from a luminance distribution curve of the first positive image and the first negative image, acquires a plurality of second border coordinates in the second spatial code image from a luminance distribution curve of the second positive image and the second negative image, acquires a plurality of third border coordinates in the third spatial code image from a luminance distribution curve of the third positive image and the third negative image, and acquires a plurality of fourth border coordinates in the fourth spatial code image from a luminance distribution curve of the fourth positive image and the fourth negative image; an intersection coordinate acquirer that acquires first borderlines each connecting first border coordinates including the same code among the plurality of first border coordinates in the first spatial code image, second borderlines each connecting second border coordinates including the same code among the plurality of second border coordinates in the second spatial code image, third borderlines each connecting third border coordinates including the same code among the plurality of third border coordinates in the third spatial code image, and fourth borderlines each connecting fourth border coordinates including the same code among the plurality of fourth border coordinates in the fourth spatial code image; and synthesizes the first spatial code image and the second spatial code image and synthesizes the third spatial code image and the fourth spatial code image to acquire first intersection coordinates of the first borderlines and the second borderlines and second intersection coordinates of the third borderlines and the fourth borderlines; a second transform matrix calculator that transforms the first intersection coordinates and the second intersection coordinates by use of the first projection transform matrix, transforms the first intersection coordinates transformed by use of the first projection transform matrix into coordinates in a local coordinate system for the first image projection device, then calculates a second projection transform matrix usable to projection-transform the first intersection coordinates into intersection coordinates uniformly or substantially uniformly distributed in the first area, transforms the second intersection coordinates transformed by use of the first projection transform matrix into coordinates in a local coordinate system for the second image projection device, and then calculates a third projection transform matrix usable to projection-transform the second intersection coordinates into intersection coordinates uniformly or substantially uniformly distributed in the second area; a divided image generator that creates a first divided image to be output to the first image projection device and a second divided image to be output to the second image projection device; and an image corrector that transforms image data on the first divided image by use of the second projection transform matrix, transforms image data on the second divided image by use of the third projection transform matrix, and translates at least one of the first divided image and the second divided image toward a borderline between the first divided image and the second divided image to delete a gap between the first divided image and the second divided image. |
