JPH01113019A - Monitor imaging apparatus - Google Patents

Abstract

PURPOSE:To obtain optimal exposure amount easily with simple operations by use of an apparatus consisting of an exposure controlling part which controls luminance of a monitoring picture and exposure of a camera according to signals obtained from a camera discrimination part and a light measuring part. CONSTITUTION:When a code (a) which indicates the type of a camera 12 is input into a camera discrinating part 16, the said code is compared with pre- recorded code and the type of the camera 12 is identified. A signal (b) which indicates the type of the camera 12 is output to an exposure controlling part 18. The brightness of an image indicated by a monitor 19 is measured by a photosensor 22, and a light measuring circuit 23 outputs a signal (c) which indicates brightness ot the monitoring image to an exposure controlling part 18. In the exposure controlling part 18, data concerning proper expoure amount for each type of camera are stored. Based on these data, it outputs a controlling sign (d) to an exposure corrector 24 so as to obtain proper exposure time with the use of a signal which expresses the type of the camera and a signal which expresses brightness of the monitoring image and also by outputting a luminance adjusting signal (e) to a luminance adjustor 21.

Description

Detailed Description of the Invention [Industrial Application Field 1] The present invention is an electronic endoscope or an external device attached to the eyepiece of an endoscope that uses an image guide. ! &Regarding photographic equipment.

[Problems to be solved by conventional techniques and inventions] In recent years,
Endoscopes are widely used that allow the insertion of a 1.5-inch length insertion section into a body cavity to observe the affected area within the body cavity without making an incision, and to perform treatment using treatment instruments as necessary. It became so.

Furthermore, electronic endoscopes using solid-state image pickup devices as image carriers have recently been realized, and it has become possible to easily record and reproduce images of the endoscope.

Furthermore, even in an optical endoscope using an image guide, an external camera can be attached to record and reproduce endoscopic images.

By the way, it has become common practice to view endoscopic images on a television monitor, but when making a detailed diagnosis carefully, monitor images can be used to save diagnostic materials. 11! Photographs are often taken using the shadow 5A position.

The monitor device is configured to be connected to various cameras. For example, 35IllI% - eye reflex camera, Polaroid camera, special medical 16Ill1m camera, etc. When using these cameras to capture images displayed on a television monitor, the elements of one screen are 1/60 second (1 field) in imaging systems such as NTSC, such as interlaced scanning, and one perfect image is taken. The screen is 1/2 times the size of two 1/60 second images (1 frame).
30, the photographing time required to be longer than at least 1/30 second, which is one frame. However, the image displayed on the television monitor is
Some images are extremely bright or extremely dark. In extremely bright situations, if the aperture of the camera is fixed, the shutter speed may be less than 1730 seconds, and unevenness may occur in the film image. In addition, when it is extremely dark, a very long shadow time is required.

The conventional monitor image capturing device M1 captures an image of a television monitor 3 built into the device main body 2 as shown in FIG. When shooting an extremely bright television monitor image or an extremely dark television monitor 3, use the exposure compensation knob 6 and brightness adjustment knob 7 to adjust the exposure time to optimize the exposure time. This was adjusted empirically to ensure that the shutter speed would not be faster than specified or that the shooting time would not be longer than necessary. This correction operation was performed for each camera with its own settings, and was performed through trial and error based on the experience of the photographer.

[Object of the Invention] The present invention has been made in view of the above circumstances, and is capable of automatically setting the exposure compensation operation based on the type of camera and the brightness of the television monitor. It is an object of the present invention to provide a monitor image photographing device that can easily obtain a monitor image without performing any operations.

[Means and effects for solving the problems] The monitor image capturing device according to the present invention includes a camera discrimination section that discriminates the type of camera connected to the monitor, and a photometry section that measures light from the screen of the monitor. and an exposure control section that receives signals from the camera discrimination section and the photometry section and controls the brightness of the monitor screen and the exposure of the camera.

In other words, it determines the type of each camera and changes the camera's exposure value or the television monitor's brightness adjustment value depending on the brightness of the image to obtain an appropriate exposure time. It is.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

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

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

The camera 12 is provided with n bins (not shown), and these bins are connected to a camera discriminator 16 provided in the main body 13 of the apparatus by n signal lines 14. This camera discrimination section 16 discriminates the type of camera 12 attached to the device main body 13 based on a pre-registered code.

This camera discrimination section 16 is a type of decoder circuit, and is configured to output a signal representing the type of camera 12 to the exposure control section 18 through m signal lines 17. This exposure control section 18 is a television monitor (referred to as a monitor).
The monitor 19 is connected to a brightness adjuster 21, and the brightness of the image displayed on the monitor 19 can be adjusted.

The brightness of the image of Wang Eryu 19 is detected by a photosensor 22 and measured by a photometry circuit 23. This photometry circuit 23 is configured to output photometry data to the exposure control section 18. Further, the exposure control section 18 is connected to an exposure compensator 24 built into 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 explained.

Zero bins (not shown) provided in the camera 12 attached to the device main body 13 are connected to the camera discrimination section 16 by zero signal lines 14 .

Among these zero signals FJ14, one is grounded, and by selectively connecting this grounding pin to the other pins, it is possible to output the code in Table 1 indicating the type of camera 12. That is, the voltage level of the pin connected to ground becomes L, and the voltage level of the other unconnected pins becomes T[ level. In this way, depending on the connection method, there are 2°-1 types of cameras 12 as shown in Table 1.

As described above, when the code a representing the type of camera 12 is input to the camera discriminator 16, it is compared with a pre-registered code and the type of camera 12 is deciphered. This decoded signal representing the type of camera 12 is output to the exposure control section on the first day.

On the other hand, the brightness of the image displayed on the monitor 19 is measured by the photosensor 22, and the photometry circuit 23 outputs a signal C corresponding to the brightness of the monitor image to the exposure control section 18.

The exposure control unit 18 is set with data that provides an appropriate exposure amount depending on the type of camera, and the appropriate exposure is determined based on the camera type signal shown in Table 1 and the signal C representing the brightness of the monitor image. The control unit Tj d
@The exposure is adjusted by outputting it to the exposure compensator 24, and the brightness adjustment signal e is output to the brightness adjuster 2 to adjust the brightness of Tanabata 19.
'1.

According to this embodiment, by determining the type of camera 12 and correcting the exposure amount according to the camera 2, it is possible to capture an optimal monitor image even for extremely bright or extremely dark screens. .

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

The exposure compensation unit 26 provided in the camera 12 is composed of a voltage comparator 27 and an EV value switching unit 28.
The V value switching unit 28 includes a plurality of resistors R1 and R1 connected in series.
. . . and a changeover switch 29 that connects a plurality of contacts wired to the connection portions of the plurality of resistors R1 .

Inside the camera 12, the E-E exposure signal f is input to one comparison input terminal of a voltage comparator 27, and the voltage increases with the start of photometry. The exposure compensation voltage 9 is set to the other comparison input terminal of the voltage comparator 27 by a 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 E-E exposure signal f exceeds the exposure correction voltage q, a photometry end signal is output to the exposure control section 18, and the photometry is ended. In other words, exposure can be selected by switching the voltage level of the exposure correction voltage q.

By using the configuration as in this embodiment, the exposure control section 1
The exposure time can be controlled by electrically processing the exposure correction signal q generated from 8.

The other functions and effects of Structure 2 are the same as those of the first embodiment.

In each of the above embodiments, the type of camera is determined by the camera determination section, but the camera determination section is omitted and the cameras are limited, and the exposure is 11JI! It is also possible to perform only D.

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

[Effects of the Invention] As explained above, according to the present invention, it is possible to automatically set the exposure compensation operation based on the type of camera and the brightness of the television monitor, and it is possible to automatically set the exposure compensation operation based on the type of camera and the brightness of the television monitor. You can easily get it without.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a monitor photographing device according to a first embodiment of the present invention, FIG. 2 is an explanatory diagram of an exposure compensation section inside a camera according to a second embodiment of the present invention, and FIG. FIG. 8 is a schematic explanatory diagram of a monitor image 81 shadow device. 11...Monitor photographing device 12...Camera 13...Device main body 18.
・・Exposure control unit 1・・Monitor Fig. 1 Fig. 3

Claims (1)

[Scope of Claims] A monitor image photographing device comprising a monitor and a camera capable of photographing an image of the monitor, comprising: a photometry section that measures light from the screen of the monitor; and a signal from the camera discrimination section and the photometry section. A monitor image photographing device comprising: an exposure control section that receives a received signal and controls the brightness of the monitor screen and the exposure of the camera.