Image processing apparatus and method
First Claim
1. An image processing apparatus generating a virtual viewpoint image from a captured image acquired by an imaging unit having distortion characteristics and vignetting characteristics, based on distortion characteristics and vignetting characteristics of a virtual camera, the image processing apparatus comprising:
- a first calculation unit configured to execute a first distortion correction on coordinates of a target pixel in the virtual viewpoint image based on the distortion characteristics of the virtual camera and to calculate coordinates in the virtual viewpoint image after the first distortion correction;
a second calculation unit configured to calculate ideal coordinates that are not distorted and correspond to a space position captured at the target pixel in the captured image from the coordinates of the target pixel in the virtual viewpoint image after the distortion correction;
a third calculation unit configured to execute a second distortion correction on coordinates of the captured image and to calculate real coordinates in the captured image from the ideal coordinates based on the distortion characteristics of the imaging unit;
a fourth calculation unit configured to calculate a pixel value of the target pixel based on the real coordinates and the captured image data; and
a correction unit configured to correct the pixel value based on the vignetting characteristics of the imaging unit and the vignetting characteristics of the virtual camera.
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Accused Products
Abstract
An image processing apparatus executes a distortion correction on coordinates of a target pixel in a virtual viewpoint image based on distortion characteristics of a virtual camera and calculates coordinates in the virtual viewpoint image after the distortion correction. The image process apparatus calculates ideal coordinates in a captured image from the coordinates in the virtual viewpoint image after the distortion correction and calculates real coordinates in the captured image from the ideal coordinates in the captured image based on distortion characteristics of an imaging unit. The image process apparatus calculates a pixel value corresponding to the real coordinates from image data of the virtual viewpoint image and corrects the pixel value corresponding to the real coordinates based on ambient light amount decrease characteristics of the imaging unit and ambient light amount decrease characteristics of the virtual camera.
17 Citations
6 Claims
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1. An image processing apparatus generating a virtual viewpoint image from a captured image acquired by an imaging unit having distortion characteristics and vignetting characteristics, based on distortion characteristics and vignetting characteristics of a virtual camera, the image processing apparatus comprising:
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a first calculation unit configured to execute a first distortion correction on coordinates of a target pixel in the virtual viewpoint image based on the distortion characteristics of the virtual camera and to calculate coordinates in the virtual viewpoint image after the first distortion correction; a second calculation unit configured to calculate ideal coordinates that are not distorted and correspond to a space position captured at the target pixel in the captured image from the coordinates of the target pixel in the virtual viewpoint image after the distortion correction; a third calculation unit configured to execute a second distortion correction on coordinates of the captured image and to calculate real coordinates in the captured image from the ideal coordinates based on the distortion characteristics of the imaging unit; a fourth calculation unit configured to calculate a pixel value of the target pixel based on the real coordinates and the captured image data; and a correction unit configured to correct the pixel value based on the vignetting characteristics of the imaging unit and the vignetting characteristics of the virtual camera. - View Dependent Claims (2, 3, 4, 5)
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6. An image processing method for generating a virtual viewpoint image from a captured image acquired by an imaging unit having distortion characteristics and vignetting characteristics, based on distortion characteristics and vignetting characteristics of a virtual camera, the image processing method comprising:
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executing a first distortion correction on coordinates of a target pixel in the virtual viewpoint image based on the distortion characteristics of the virtual camera and calculating coordinates in the virtual viewpoint image after the distortion correction; calculating ideal coordinates that are not distorted and correspond to a space position captured at the target pixel in the captured image from the coordinates of the target pixel in the virtual viewpoint image after the distortion correction; executing a second distortion correction on coordinates of the captured image and calculating real coordinates in the captured image from the ideal coordinates based on the distortion characteristics of the imaging unit; calculating a pixel value of the target pixel based on the real coordinates and the captured image data; and correcting the pixel value based on the vignetting characteristics of the imaging unit and the vignetting characteristics of the virtual camera.
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Specification