JP2002077705A - Television camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a television camera for acquiring a video signal by picking up imaged lights converged by a wide angle lens (whose angle of view is ranging from 90 deg. to 180 deg., fish eye lens, a conical mirror) capable of reducing the circuit constitution of an interface between a conventional television camera and a distortion correcting device by simplifying the system construction. SOLUTION: This television camera is provided with a video signal processing part and a distortion correction processing part for performing distortion correction processing of a video signal signal-processed by the video signal processing part, so that a video signal whose distortion due to a wide angle lens is corrected can be outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television camera for capturing an image with a wide-angle lens (angle of view: 90 DEG to 180 DEG, fisheye lens, conical mirror).

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a video signal obtained by imaging a subject projected by a wide-angle lens (angle of view is 90 to 180 degrees, a fish-eye lens, a conical mirror) is output without correcting distortion. An analog video signal having distortion due to a wide-angle lens output from such a general television camera is input to a device that performs distortion correction processing using an externally provided wide-angle lens, and is input by the device. After the analog video signal having distortion remaining due to the wide-angle lens is converted into a digital video signal, the distortion caused by the wide-angle lens is corrected.

[0003]

Therefore, in order to obtain a distortion-corrected video signal, a system having a wide-angle lens distortion correction device in addition to the conventional television camera is required, so that a system space is required. It will be more demanding and its cost will be higher. Also, by converting the video signal output as an analog signal from the conventional television camera into a digital signal again, the quality of the converted video signal is degraded due to an increase in quantization error. turn into.

An object of the present invention is to make it possible to obtain a video signal in which distortion of a wide-angle lens is corrected by a television camera alone, thereby facilitating the construction of a system using the television camera. Another object of the present invention is to realize a lower cost by reducing a circuit configuration of an interface portion between the apparatus and the distortion correction device.

[0005]

In order to achieve the above-mentioned object, a television camera according to the present invention comprises an image pickup light collected by a wide-angle lens (angle of view: 90 ° to 180 °, fisheye lens, conical mirror). A television camera that obtains a video signal by capturing a video signal, comprising: a video signal processing unit; and a distortion correction processing unit that performs a distortion correction process on the video signal processed by the video signal processing unit. Is output.

Accordingly, the present invention makes it possible to obtain a video signal in which the distortion of the wide-angle lens is corrected by the television camera alone, thereby facilitating the system construction, and the circuit configuration of the interface between the conventional television camera and the distortion correction device. The cost can be reduced because of the reduction.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a television camera according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram of one embodiment of a television camera according to the present invention. FIG. 1 mainly illustrates a portion used for describing a television camera according to the present invention.

In FIG. 1, reference numeral 1 denotes a wide-angle lens for capturing an image of a subject at a wide angle, and 2 denotes an image sensor (CC) for converting incident light incident from the wide-angle lens 1 into an electric signal.
D image sensor, CMOS image sensor, etc.), 3 is an image sensor 2
An amplifier 4 that samples and holds the output video signal of the above, amplifies the output video signal to a required level, and outputs the amplified video signal.
The converter 5 is a digital signal processor (DSP) that performs various video signal processing such as white balance adjustment, gamma correction, and distortion correction on the digital video signal output from the A / D converter 4, and the digital signal processor 6 is a video signal A D / A converter for converting the processed digital video signal into an analog video signal, 7
Is a connector for outputting the analog video signal output from the D / A converter 6 to the outside of the television camera.
This is a monitor for inputting an analog video signal output to the outside of the television camera.

The operation of the television camera according to the present invention will be described below. In the television camera of the present invention, the imaging light a condensed at a wide angle by the wide-angle lens 1 is photoelectrically converted by the imaging element 2 and obtained by the photoelectric conversion.
Analog video signal b representing distorted video by wide-angle lens
Is input to the amplifier 3. The distorted analog video signal c amplified by the amplifier 3 is further input to the A / D converter 4. The distorted digital video signal d obtained by being converted into a digital signal by the A / D converter 4 is input to the digital video signal processor 5. In the digital video signal processor 5,
Distortion correction of the input distorted digital video signal is performed,
The distortion-corrected digital video signal f is input to the D / A converter 6. The video signal f input by the D / A converter 6 is D / A-converted, and the distortion-corrected analog video signal g obtained thereby is output from the connector 7 and the monitor 8
To enter.

[0010]

As described above, according to the present invention, since a television camera alone can obtain a video signal in which distortion of a wide-angle lens is corrected, the system can be easily constructed, and a conventional television camera and a distortion correction device can be obtained. The cost can be reduced because the circuit configuration of the interface with the interface is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a television camera according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional television camera and a system using the television camera.

[Explanation of symbols]

1: wide-angle lens, 2: imaging device, 3: amplifier,
4: A / D converter, 5: Digital video signal processor,
6: D / A converter, 7: connector, 8: monitor.

Claims (1)

[Claims] 1. A wide-angle lens (angle of view of 90 ° to 180 °,
In a television camera that obtains a video signal by capturing imaging light condensed by a fisheye lens or a conical mirror, a video signal processing unit and a distortion that performs a distortion correction process on the video signal processed by the video signal processing unit A television camera, comprising: a correction processing unit; and outputting a video signal in which distortion due to a wide-angle lens has been corrected.