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| Receiver interference suppression system |
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| Method and apparatus for digitally processing gamma pedestal and gain |
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Multi-format digital image pickup apparatus
| Details |
Inventors: Iura, Noriyuki; Imaide, Takuya; Kinugasa, Toshiro;
Assignee: Hitaci, Ltd. (Tokyo, JP)
Primary Examiner: Groody; James J.
Assistant Examiner: Hsia; Sherrie
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus
An image pickup apparatus which includes a timing pulse generator, an imager having an effective pixel number requiring a predetermined frequency for the horizontal scanning pulse in order to to produce a video signal having a normal aspect ratio and a video signal processing circuit for processing the signal outputted from the imager to generating a video signal. An electronic zoom signal processing circuit is provided for enlarging the video signal generated by the video signal processing circuit in the horizontal direction. The timing pulse generator supplies the imager with a horizontal pulse having a frequency higher than the predetermined frequency required by the effective pixel number of the image input element and the electronic zoom signal processing circuit enlarges the video signal generated in the horizontal direction to produce a video signal having a normal aspect ratio. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG.
1 is a diagram of an image pickup apparatus according to the first embodiment of the present invention.
The image pickup apparatus includes means to designate a lens 101, an imager 102, an A/D converter 103, a timing pulse generator 104, a video signal processing circuit 105, an electronic zoom signal processing circuit 106, an encoding device 107, an encoder 108, a decoder 109, a color signal modulation circuit 110, an digital to analog (D/A) converter 111, a monitor 112, a first transmission I/F circuit 113, and a second transmission I/F circuit 114, Connected to the first transmission I/F circuit 113, by a telephone network.
The timing pulse generator 104 and the electronic zoom signal processing circuit 106 may be such as that taught by an "An Electronic Zoom Video Camera Using Imager Scanning Control" by T.
Kinugasa, IEEE, 1991, pp.
46-49.
The decoder 109 and the encoder 108 may be such as that taught by the LSI logic CCITT video compression chip set Technical note.
An embodiment of the imager 102 is shown in FIG.
3.
In the construction shown in FIG.
3 light inputted through the lens 101 to the imager 102 is subjected to photo-electric conversion by, for example, a photo diode 301.
A converted signal charge is transferred through a vertical CCD 302 to a horizontal CCD 303, and in synchronization with a horizontal scanning pulse a supplied from the timing pulse generator 104.
The transferred signal is subjected to voltage conversion and outputted as a signal.
The output signal of the image pickup element 102 is converted by the A/D converter 103 into a sampled digital signal in accordance with a timing pulse supplied from the timing pulse generator 104.
The signal converted into a digital signal by the A/D converter 103 is converted into a video signal by the video signal processing circuit 105 carrying out known processing such as A-correction.
The output video signal of the video signal processing circuit 105 representative of the image to be displayed is enlarged in the horizontal direction so that the image is converted to the correct aspect ratio for the display and outputted as a video signal by the electronic zoom signal processing circuit 106 which is controlled by the timing pulse generator 104
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Image Analysis 
