Image device, surveillance camera, and mask method of camera screen
First Claim
1. An image device including an imaging element which image device is mountable to a rotative table and for masking a partial area of a picture to be displayed on a camera screen so as not to be seen which picture has been captured by the imaging element, comprising:
- a control position information obtaining section configured to obtain PAN and TILT rotation angles of said rotative table and a zoom position;
a mask generating section configured to calculate coordinates of corners of a first mask area disposed on an image plane defined by said imaging element, the coordinates being in a 3-dimensional coordinate system having an origin through which a central axis of a rotation for the PAN rotation angle and another central axis of a rotation for the TILT rotation angle pass;
a mask display position calculating section configured to calculate coordinates of corners of a second mask area on said camera screen in a 2-dimensional coordinate system from said coordinates of the corners of said first mask area calculated by said mask generating section by using a relation that distances between a plurality of corners of said camera screen and each corner of said second mask area are proportional to distances between a plurality of corners of said image plane and each corner of said first mask area with a constant ratio, respectively; and
a mask signal output section configured to be able to add a masking signal to a signal of the picture to be displayed on said camera screen so that the picture in said second mask area is not able to be seen.
2 Assignments
0 Petitions
Accused Products
Abstract
In a microcomputer included in an image device, a mask 2D 3D converting section expresses coordinates of a 2-dimensional image plane defined by an imaging element having a rectangular contour in a 3-dimensional coordinate system. The image plane is positioned in the state that a focal length corresponding to a zoom position is adopted as a Z coordinate value of the image plane in the 3-dimensional coordinate system. A mask display position calculating section 165 calculates a 2-dimensional position of a mask on a camera screen by utilizing a similarity of the size of the image plane and the size of the camera screen when a position of a mask on the image plane in the 3-dimensional coordinate system after PAN, TILT rotations and a zooming is converted into the 2-dimensional position of the mask on the camera screen.
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Citations
9 Claims
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1. An image device including an imaging element which image device is mountable to a rotative table and for masking a partial area of a picture to be displayed on a camera screen so as not to be seen which picture has been captured by the imaging element, comprising:
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a control position information obtaining section configured to obtain PAN and TILT rotation angles of said rotative table and a zoom position; a mask generating section configured to calculate coordinates of corners of a first mask area disposed on an image plane defined by said imaging element, the coordinates being in a 3-dimensional coordinate system having an origin through which a central axis of a rotation for the PAN rotation angle and another central axis of a rotation for the TILT rotation angle pass; a mask display position calculating section configured to calculate coordinates of corners of a second mask area on said camera screen in a 2-dimensional coordinate system from said coordinates of the corners of said first mask area calculated by said mask generating section by using a relation that distances between a plurality of corners of said camera screen and each corner of said second mask area are proportional to distances between a plurality of corners of said image plane and each corner of said first mask area with a constant ratio, respectively; and a mask signal output section configured to be able to add a masking signal to a signal of the picture to be displayed on said camera screen so that the picture in said second mask area is not able to be seen. - View Dependent Claims (2, 3)
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4. A surveillance camera having a camera including an optical lens unit, an imaging element and an image processing section for processing a signal of a picture captured by said imaging element and outputting a processed signal of the picture to a camera screen, and a rotative table supporting the camera rotatively, comprising:
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a control position information obtaining section configured to obtain PAN and TILT rotation angles of said rotative table and a zoom position; a mask generating section configured to calculate coordinates of corners of a first mask area disposed on an image plane defined by said imaging element, the coordinates being in a 3-dimensional coordinate system having an origin through which a central axis of a rotation for the PAN rotation angle and another central axis of a rotation for the TILT rotation angle pass; a mask display position calculating section configured to calculate coordinates of corners of a second mask area on said camera screen in a 2-dimensional coordinate system from said coordinates of the corners of said first mask area calculated by said mask generating section by using a relation that distances between a plurality of corners of said camera screen and each corner of said second mask area are proportional to distances between a plurality of corners of said image plane and each corner of said first mask area with a constant ratio, respectively; and a mask signal output section configured to be able to add a masking signal to a signal of the picture to be displayed on said camera screen so that the picture in said second mask area is not able to be seen, whereby masking can be carried out in a partial area of the picture to be displayed on said camera screen. - View Dependent Claims (5, 6)
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7. A mask method of masking a camera screen by using an image device including an imaging element which image device is mountable to a rotative table and for masking a partial area of a picture to be displayed on the camera screen so as not to be seen which picture has been captured by the imaging element, comprising:
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a first step of obtaining PAN and TILT rotation angles of said rotative table and a zoom position; a second step of calculating coordinates of corners of a first mask area on an image plane defined by said imaging element which coordinates is in a 3-dimensional coordinate system having an origin through which a central axis of a rotation for the PAN rotation angle and another central axis of a rotation for the TILT rotation angle pass; a third step of calculating coordinates of corners of a second mask area on said camera screen in a 2-dimensional coordinate system from said coordinates of the corners of said first mask area calculated by said second step by using a relation that distances between a plurality of corners of said camera screen and each corner of said second mask area are proportional to distances between a plurality of corners of said image plane and each corner of said first mask area with a constant ratio, respectively; and a fourth step of adding a mask signal to a signal of the picture to be displayed on said camera screen so that the picture in said second mask area calculated by said third step is not able to be seen. - View Dependent Claims (8, 9)
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Specification