JPH05103258A - Video camera - Google Patents

Abstract

PURPOSE:To obtain an auto-iris control signal corresponding to the shape of an object, and to easily attain confirmation during setting. CONSTITUTION:Only a video signal corresponding to the inside of a window is inputted by a gate circuit 16 to an integration circuit 15 by a window setting signal 19 to a camera 7, and the data of the quantity of light in the window are searched as an iris control signal 14. The window setting signal 19 is inputted to a character generator 18, and a graphic 17 corresponding to the window is inserted into a video signal 13. Thus, a user can set the window while looking at a monitor, and the auto-iris control emphasizing the specific object can be attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to auto iris control in a video camera.

[0002]

2. Description of the Related Art A conventional technique is disclosed in JP-A-1-293767.
As described in the publication, it has a function of limiting the area where the control signal of the auto iris is obtained, but the shape is rough and its position is not clear to the user.

[0003]

The above prior art does not take into consideration the shape of the area (hereinafter referred to as a window) from which the control signal of the auto iris is obtained, and cannot be easily confirmed even if the shape is changed to a more accurate shape. There was a problem.

An object of the present invention is to make it possible to set a window according to the shape of a subject, and further to make it easy to confirm during setting.

[0005]

In order to achieve the above object, the camera section is provided with an operation section for inputting a signal for changing a window.

Further, in order to display the changed window shape in the output signal, a character generator is provided in the camera section or the power adapter section.

[0007]

The window is set in an arbitrary position on the screen in an arbitrary shape by a signal from the operation unit.

Further, by outputting a figure corresponding to the position and shape of the window from the character generator and superimposing it on the video signal output, the positional relationship between the window and the subject can be confirmed on the monitor. This allows the user to set the window while viewing on the monitor.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanation of a window for auto iris control.

When the brightness of the target object 2 and the background 3 on the screen 1 is significantly different, backlight or over-forwarding occurs. If the subject 2 in this state is photographed by a camera that controls auto iris control based on the light amount of the entire screen, the image of the subject 2 becomes too dark or too bright.

If the area 5 (window) for calculating the light quantity for the automatic iris control is set and the light quantity of the image 6 outside thereof is ignored and the position and shape of the window 5 are made variable, it is adjusted to the subject 2. As a result, it is possible to prevent backlighting and over-forwarding.

Furthermore, by adding the shape of the window 5 to the video signal output by the character generator, the user can easily set the window 5 and superimpose it on the subject 2.

FIG. 2 is a block diagram showing an embodiment of the present invention.

Window setting signal input 19 to the camera 7
Thus, the gate circuit 16 inputs the video signal corresponding to the inside of the window to the integration circuit 15, and the integration circuit 15 obtains the integrated value of the input signal.

The obtained integral value becomes the iris control signal 14 as the data of the light quantity in the window.

The position and shape of the window in the screen are changed by the window setting signal 19. further,
By inputting to the character generator 18, the graphic 17 corresponding to the window is added to the video signal 13. This allows the user to set the window while looking at the monitor, enabling auto iris control that focuses on a particular subject.

FIG. 3 shows another embodiment of the present invention.

In a surveillance system divided into a camera 20 and a power adapter 21, a window setting signal 19 is transmitted from the power adapter 21 to change the window on the camera side, and a character generator 24 in the adapter 21 corresponds to a figure corresponding to the window. 17 is output.
In the case of this embodiment, if the power adapter controls a plurality of cameras, it is not necessary to provide the character generator 24 for all the cameras, and the cost can be reduced.

[0020]

According to the present invention, the window for auto iris control can be changed and its position on the screen can be confirmed, so that there is an effect that auto iris control according to the subject can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a window.

FIG. 2 is a block diagram of an iris control camera.

FIG. 3 is a block diagram of an iris control camera.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Video screen, 2 ... Subject, 3 ... Background, 4 ... Screen using the present invention, 5 ... Window, 6 ... Outside window, 7 ... Camera, 8 ... Auto iris lens, 9 ... Sensor, 10 ... Preamplifier, 11 ... Process circuit, etc. 12 ... Addition circuit, 13 ... Video signal output, 14 ... Iris control signal, 15 ... Integrator circuit, 16 ... Gate circuit, 17 ... Window corresponding figure, 18 ... Character generator, 19 ... Window setting signal, 20 ... Camera, 21 ... Adapter, 22 ... Addition circuit, 23 ... Video signal output, 24 ... Character generator.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinji Kishino 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Stock Company, Hitachi Image Information Systems (72) Inventor Kiyoshi Yamauchi 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi Image Information System

Claims (2)

[Claims] 1. A video camera having an automatic iris control function, wherein a region for obtaining an iris control signal can be set at any position on the screen in any shape. 2. A video camera having an automatic iris control function, which is provided with a function of displaying an area for obtaining an iris control signal on a screen.