JPH0796004B2 - Monitor image capture device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to photographing a monitor image projected by an external television camera or the like mounted on an eyepiece of an electronic endoscope or an endoscope using an image guide. Regarding the device.

[Problems to be Solved by Prior Art and Invention] In recent years, by inserting an elongated insertion portion into a body cavity,
2. Description of the Related Art Endoscopes have become widely used, which allow observation of an affected area in a body cavity without making an incision, and medical treatment using a treatment tool as needed.

Further, recently, an electronic endoscope using a solid-state image sensor as an image pickup means has been realized, and recording and reproduction of an endoscope screen can be easily performed.

Further, also in an optical endoscope using an image guide, it is possible to record or reproduce an endoscopic image by mounting an external camera.

By the way, it has come to be widely practiced to make a diagnosis by observing an endoscopic image on a television monitor. However, when a detailed diagnosis is carefully performed, a monitor image photographing device is used to store the diagnostic material. Photography is often done by.

The monitor photographing device is configured to be connected with various cameras. For example, it is a 35 mm single-lens reflex camera, a polaroid camera, a medical special 16 mm camera, or the like. When capturing an image displayed on a television monitor with these cameras, one screen element is 1/60 second (one field) in the image system such as NTSC such as interlaced scanning, which is one perfect element. The screen requires a time longer than 1/30 second, which is at least one frame, from the background expressed by 1/30 of two 1/60 second images (1 frame). However, the images displayed on the television monitor include extremely bright images or dark images. If it is extremely bright, the shutter speed may be 1/30 seconds or less when the aperture of the camera is fixed, and unevenness may occur in a film image taken. Also, when it is extremely dark, a very long shooting time is required.

As shown in FIG. 3, the conventional monitor image photographing device 1 displays an image of the television monitor 3 built in the device main body 2, for example, a 35 mm single-lens reflex camera, a polaroid camera, a medical special
It is usual to shoot with a camera 4 such as a 16 mm camera, and for an extremely bright television monitor image or an extremely dark television monitor 3, the exposure compensation knob 6 and the brightness are adjusted in order to optimize the exposure time. The exposure time was adjusted empirically with the adjustment knob 7 so that the shutter speed would not be faster than the specified speed, or the shooting time would not be longer than necessary. This correction operation is performed for each camera at each setting, and after trial and error, it is performed based on the experience of the photographer.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an exposure correction operation can be automatically set based on the type of camera and the brightness of a television monitor, and an optimum exposure amount is complicated. It is an object of the present invention to provide a monitor image photographing device that can be easily obtained without performing various operations.

[Means and Actions for Solving Problems] A monitor image capturing apparatus according to the present invention includes a camera determination unit that determines the type of a camera connected to the monitor, and a photometric unit that measures the light from the screen of the monitor. The camera discriminating unit and the exposure control unit that receives the signals from the photometry unit and controls the brightness of the monitor screen and the exposure of the camera.

That is, the type of each camera is discriminated, and together with this, the exposure value of the camera or the brightness adjustment value of the television monitor is changed according to the brightness of the image so that an appropriate exposure time can be obtained. Is.

Embodiments Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a monitor photographing apparatus according to the first embodiment of the present invention.

The monitor photographing device 11 includes a camera 12 and a device body 13.

The camera 12 is provided with n pins (not shown), and these pins are connected to the device main body by n signal lines 14.
It is connected to a camera discrimination unit 16 provided inside 13. This camera discrimination unit 16 is a camera attached to the device body 13.
The 12 types are identified by the code registered in advance.
The camera discrimination unit 16 is a kind of decoder circuit, and outputs a signal representing the type of the camera 12 to the exposure control unit 18 through m signal lines 17. This exposure control unit 18
Is connected to a brightness adjuster 21 of a television monitor (hereinafter referred to as monitor) 19 so that the brightness of an image displayed on the monitor 19 can be adjusted.

The brightness of the image on the monitor 19 is detected by a photo sensor 22 and measured by a photometric circuit 23. The photometric circuit 23 outputs the photometric data to the exposure controller 18. Further, the exposure control unit 18 is connected to an exposure corrector 24 built in the camera 12 so that the exposure amount of the camera 12 can be adjusted.

The operation of the monitor photographing device 11 configured as described above will be described.

The n pins (not shown) provided in the camera 12 attached to the apparatus main body 13 are connected to the camera discrimination unit 16 by the n signal lines 14. One of the n signal lines 14 is grounded, and a code indicating the type of the camera 12 can be output by selectively connecting the grounding pin and other pins. That is, the voltage level of the pin connected to the ground becomes L, and the voltage level of the other pin not connected becomes H level. Depending on how you connect in this way, there are 2 ^n-1 types of cameras.
It can represent 12 types.

When the code a representing the type of the camera 12 is input to the camera discrimination unit 16 as described above, it is compared with a code registered in advance and the type of the camera 12 is decoded. The decoded signal b representing the type of the camera 12 is output to the exposure controller 18.

On the other hand, the brightness of the image displayed on the monitor 19 is measured by the photo sensor 22, and the photometric circuit 23 outputs a signal c corresponding to the brightness of the monitor image to the exposure control unit 18. The exposure control unit 18 is set with data that provides an appropriate exposure amount according to the type of each camera, and an appropriate exposure time is set by the signal b indicating the type of camera and the signal c indicating the brightness of the monitor image. Therefore, the control signal d is output to the exposure compensator 24 to adjust the exposure amount, and the brightness of the monitor 19 is controlled by outputting the brightness adjustment signal e to the brightness adjuster 21.

According to the present embodiment, the type of the camera 12 is discriminated and the exposure amount is corrected according to the camera 2, so that an optimum monitor image can be taken even on an extremely bright screen or an extremely dark screen. .

FIG. 2 is an explanatory diagram of an exposure correction unit inside the camera according to the second embodiment of the present invention.

The exposure compensator 26 provided in the camera 12 includes a voltage comparator 27
And an EV value switching unit 28.
Is composed of a plurality of resistors R1 ... Connected in series and a changeover switch 29 having a plurality of contacts wired at the connection portion of the resistors R1.

Inside the camera 12, the EE exposure signal f is a voltage comparator.
It is input to one of the comparison input terminals of 27, and the voltage rises as the metering starts. At the other comparison input terminal of the voltage comparator 27, the exposure correction voltage g is set by the changeover switch 29 whose switching is controlled by the control signal d output from the exposure control section 18 described in the first embodiment. When the EE exposure signal f exceeds the exposure correction voltage g, the photometry end signal h is output to the exposure controller 18 to end the photometry. That is, the exposure amount can be selected by switching the voltage level of the exposure correction voltage g.

By configuring as in this embodiment, the exposure control unit 18
The generated exposure correction signal g can be electrically processed to control the exposure time.

Other configurations, operations and effects are similar to those of the first embodiment.

In each of the above embodiments, the type of camera is discriminated by the camera discriminating unit, but the camera discriminating unit may be omitted to limit the camera so that only the exposure control is performed.

The present invention is not the electrically operated exposure correction means shown in the second embodiment, but means for physically changing an element such as an aperture that directly changes the optical amount by receiving a correction signal from the exposure control section. It may be.

[Effects of the Invention] As described above, according to the present invention, the exposure correction operation can be automatically set from the type of camera and the brightness of the television monitor, and the optimum exposure amount can be complicatedly operated. You can easily get without.

[Brief description of drawings]

FIG. 1 is a block diagram of a monitor photographing apparatus according to the first embodiment of the present invention, FIG. 2 is an explanatory diagram of an exposure correction unit inside a camera according to the second embodiment of the present invention, and FIG. It is an explanatory view of the outline of a monitor image photographing device. 11 …… Monitor shooting device 12 …… Camera, 13 …… Device body 18 …… Exposure control unit, 19 …… Monitor 23 …… Photometric circuit

Claims (1)

[Claims] 1. A monitor image photographing apparatus comprising a monitor and a camera capable of photographing an image on the monitor, and a photometry section for measuring light from the screen of the monitor, a signal from the camera discrimination section and the photometry section. A monitor image capturing device, comprising: an exposure control unit that controls the brightness of the monitor screen and the exposure of the camera.