Method and apparatus for automatic electronic replacement of billboards in a video image
First Claim
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1. Apparatus for automatic replacement of a billboard in a video image comprising:
- an automatic camera orientation measurement apparatus including motion measurement means operative to measure the Field of View (FOV) of the TV camera relative to a known reference position; and
an image processing means for processing video signals generated by the TV camera, wherein said processing means includes calibration means for periodically automatically calibrating the motion measurement means, the calibration means including a fine adjustment image processing means for perspectively transforming the current video image to provide an estimated transformed model, means for storing a replica of the billboard image, means for comparing the perspectively transformed video image with the stored replica to provide a residual video field, means for solving residual distortion between the transformed model and the residual video field and means for updating the estimated transformation by means of the residual distortion to provide a calibration correction factor.
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Abstract
Apparatus for automatic electronic replacement of a billboard in a video image including an automatic camera orientation measurement apparatus including motion measurement means operative to measure the Field of View (FOV) of the TV camera relative to a known reference position.
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Citations
20 Claims
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1. Apparatus for automatic replacement of a billboard in a video image comprising:
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an automatic camera orientation measurement apparatus including motion measurement means operative to measure the Field of View (FOV) of the TV camera relative to a known reference position; and
an image processing means for processing video signals generated by the TV camera, wherein said processing means includes calibration means for periodically automatically calibrating the motion measurement means, the calibration means including a fine adjustment image processing means for perspectively transforming the current video image to provide an estimated transformed model, means for storing a replica of the billboard image, means for comparing the perspectively transformed video image with the stored replica to provide a residual video field, means for solving residual distortion between the transformed model and the residual video field and means for updating the estimated transformation by means of the residual distortion to provide a calibration correction factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of automatic replacement of a billboard in a video image said method comprising the steps of:
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recording the Field of View (FOV) parameters of a TV camera in a first reference position;
storing the image viewed by the TV camera in said first reference position;
measuring the movement of the camera relative to the first reference position and recording the measurements and periodically automatically calibrating the motion measurements by comparison of the present video image produced by said TV camera with the stored video image in said reference position which comparison includes a fine adjustment image processing step including perspectively transforming the current video image to provide an estimated transformed model, storing a replica of the billboard image, comparing the perspectively transformed video image with the stored replica to provide a residual video field, solving residual distortion between the transformed model and the residual video field and updating the estimated transformation by means of the residual distortion to provide a calibration correction factor; and
calibrating a difference signal for recalibration of the motion measurements and said first reference position and replacing a real billboard in said camera'"'"'s field of view with a virtual replacement billboard in accordance with said recalibrated first reference position. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification