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Video camera and camera system having an electronic viewfinder portraying image information
| Details |
Inventors: Hashimoto, Hiroyuki; Saito, Haruo;
Assignee: Aiwa Co., Ltd. (Tokyo, JP)
Primary Examiner: Razavi; Michael T.
Assistant Examiner: Greening; Wendy R.
Attorney, Agent or Firm: Dellett and Walters
A video camera having a zoom function and a camera system are provided, wherein a ratio of view fields of the video camera and a photographic camera is calculated based on information about zooming powers of imaging lenses, and an image frame of the photographic cameras is displayed in a variable size at an electronic viewfinder in accordance with the ratio of the view fields and based on a picked-up image of fixed size, or a picked-up image is displayed in a variable size on the basis of the image frame of the photographic camera. View angles of the video camera and the photographic camera are obtained from the information about the zooming powers of the imaging lenses, and zoom adjustment is carried out with the view angles coinciding with each other, or the zooming power of one of the video camera and the photographic camera is adjusted such that the view angles become equal to each other. Accordingly, the view field of the photographic camera can be accurately recognized even if the zooming power is changed. |
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DETAILED DESCRIPTION According to one aspect of this invention, there is provided a video camera having a zoom function and including an electronic viewfinder, which comprises image frame signal generating means for generating an image frame signal for displaying an image frame of a photographic camera, image frame position changing means for changing a position of the image frame of the photographic camera in accordance with a change in an angle of view of a picked-up image caused by a change of a zooming power, and signal composition means for combining an image video signal with the image frame signal.
The picked-up image is displayed at a fixed location on a screen of the electronic viewfinder, and the image frame of the photographic camera is displayed on the screen on the basis of the picked-up image.
According to another aspect of this invention, there is provided a video camera having a zoom function and including an electronic viewfinder, which comprises image frame displaying means for displaying an image frame of a photographic camera on a screen of the electronic viewfinder, and display size changing means for changing a size of a picked-up image at the electronic viewfinder in accordance with a change in an angle of view of the picked-up image caused by a change of a zooming power.
The picked-up image is displayed on the screen of the electronic viewfinder on the basis of the image frame of the photographic camera.
According to still another aspect of this invention, there is provided a video camera having a zoom function and including an electronic viewfinder, which comprises zoom adjusting means for adjusting a zooming power, and mode changing means for setting a photographic camera mode.
In the photographic camera mode, the zooming power is adjusted by the zoom adjusting means such that an angle of view of a picked-up image coincides with that of the photographic camera.
According to a further aspect of this invention, there is provided a video camera having a zoom function and including an electronic viewfinder, which comprises image frame signal generating means for generating an Image frame signal for displaying an image frame of a photographic camera having a zoom function, image frame position changing means for changing a position of the image frame of the photographic camera in accordance with a change in an angle of view caused by a change of a zooming power, and signal composition means for combining an image video signal with the image frame signal
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Television 
