JP2747426B2 - Temperature display video camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature display video camera for photographing a subject and outputting, as a numerical display image, the temperature of a test object in the photographed scene together with a visible light image.

[0002]

2. Description of the Related Art Conventionally, television cameras have been used for various monitoring purposes. In such a surveillance camera, not only an image in the visible light range is taken, but also an infrared image, and a technique of taking an image of the visible light and the infrared light image simultaneously or separately is adopted. In addition, a technique has been adopted in which information from the outside is added and synthesized to a television image, transmitted as a signal, and the image and information are simultaneously displayed on a monitor to enable effective monitoring.

[0003]

However, conventional surveillance cameras are biased toward capturing images as visible or infrared light. Depending on the purpose of the surveillance camera, there is a case where it is desired to monitor not only a visible light image but also the temperature of a specific object or a test object in the captured scene. When the thermometer could not be directly installed on the test object, it could only be observed as an infrared image. There is a need for a device that digitally displays the temperature of a test object, for which a thermometer cannot be installed on the test object or is possible but is not practically installable, and also the temperature of any test object together with a visible image. Was.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to remotely measure the temperature of a test object existing in a part of a photographed object scene, and to obtain the measurement result. Is to provide a temperature display video camera with a temperature display function having a function of capturing a digital numerical image together with a visible light image.

[0005]

In order to achieve the above object, a temperature display video camera according to the present invention includes a reflection optical system for introducing light from a test object and forming an image, and an image formed by the reflection optical system. An infrared detector arranged in the vicinity of the position of the test object image, a temperature display unit that receives the signal from the infrared detector, calculates the temperature of the test object, and displays the calculated temperature; A finder optical system including a mirror on the incident side optical axis of the reflection optical system and reflecting light from the test object; and a display surface of the temperature display unit is arranged in the finder optical system. A thermometer unit that includes a display surface and an eyepiece system that forms an image of the test object image side by side in the same field of view, and a thermometer unit that is disposed at an eyepiece of the eyepiece lens system, and that the test object image and the temperature A TV camera that images the display surface of the display unit in the same field of view Characterized by comprising.

The present invention is preferably characterized in that the finder optical system has an automatic focusing mechanism.

[0007] In another preferred form of the present invention, the television camera is a fixed focus camera.

In another aspect of the present invention, preferably, the thermometer unit and the television camera are housed in the same housing.

According to another aspect of the present invention, the television camera is mounted on a pan / tilt base that performs pan and tilt operations by remote control or automatic control in a predetermined pattern. Can be.

According to another preferred embodiment of the present invention, the television camera is connected to a monitoring center for displaying an image of a television video signal from the television camera via signal transmission means. It can be.

In another preferred embodiment of the present invention, the monitoring center has an image processing device for recognizing a display temperature of the temperature display section by signal processing of the television image signal and outputting detected temperature data. It can be characterized.

[0012] In another aspect of the present invention, preferably, the monitoring center has an alarm device for generating an alarm according to the detected temperature data.

[0013]

According to the present invention, the temperature of a part of an object field, specifically, the temperature of an object located at the center of the object field is measured remotely by using an infrared detector disposed in an optical system, and digitally measured. The temperature display function to be displayed and the digitally displayed temperature display are taken by a television camera together with the visible light image of the object field formed by the automatic focusing mechanism. Can be remotely monitored. It also allows the temperature of any object present in the field to be recorded as video information along with its optical image, and the field is arbitrarily selected by a pan-tilt device attached to the camera This makes it possible to perform temperature measurement and monitoring of a visible light image of the temperature without being caught by the shape and position of the test object. That is, in the prior art, it was difficult to obtain data on where and what state of the test object was measured, but in the present invention, it can be easily obtained.

[0014]

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

FIG. 1 shows the entire appearance of a temperature display video camera according to an embodiment of the present invention, in which a housing is partially cut away.
In FIG. 1, reference numeral 100 denotes the entire temperature display video camera, 110 denotes a temperature display unit having an autofocus mechanism, 120 denotes a CCD television camera, and 130 denotes a housing (housing) incorporating these units and the camera.
It is.

The temperature display unit 110 can be used alone as a digital display thermometer, has a structure having a monocular lens system 111, and can remotely measure the temperature of an object on the optical axis. As will be understood from FIG. 2 described later, when the operator looks into the finder section 112 of the temperature display unit 110 aiming at the temperature measurement target,
In order for the display of the measurement result to be in the field of view of the operator,
The temperature is digitally displayed below the field of view of the viewfinder 112. When the finder 112 is viewed, the field of view is circular, and its center is located slightly above the optical axis of the finder. A circle is located at the center of the circular field of view, and the temperature of the subject within the circle is measured by a temperature sensor, and the temperature is digitally displayed.

A lens system 121 of a CCD television camera 120 having a fixed focus lens is arranged near the finder section 112 of the temperature display unit 110 and with its optical axis aligned. The television camera 120 captures the visible light image and the temperature display portion of the viewfinder 112 in the same field of view, and outputs the color video output to the outside via the connector 122. Reference numeral 123 denotes a connector for a control signal for obtaining necessary synchronization.

FIG. 2 shows the temperature display video camera 100 of FIG.
1 shows an example of the configuration of an image / temperature monitoring system using a computer.
The temperature measurement target 200 is imaged on the finder section 112 via the optical system of the temperature display unit 110, and the temperature measurement result is digitally displayed below the field of view of the finder section 112. The CCD television camera 120 captures the visible light image and the digital temperature display of the finder unit 112 in the same field of view, and transmits the captured color video output to the color monitor 220 via the communication cable 210.
The viewfinder 112 is displayed on the screen of the color monitor 220.
Is displayed in color as it is. Color monitor 2
In the display screen 20, reference numeral 221 denotes a circle at the center of the field of view, which is a measurement area mark, and the temperature of the subject in the circle 221 is measured by an infrared temperature sensor described later. Reference numeral 222 denotes a digital temperature display displayed below the field of view of the finder unit 112.

FIG. 3 shows a modification of the configuration of the image / temperature monitoring system. The difference from FIG. 2 is the temperature display video camera 10.
The point is that the image processor 300 is connected between the color monitor 220 and the color monitor 220. 310 is a communication cable similar to 210. Image processing processor 30
0 is the communication cable 2 from the temperature display video camera 100
By processing the television image signal transmitted through the digital camera 10, the digital temperature display image can be subjected to pattern recognition to output a signal of detected temperature data. Data can also be recorded on a recording medium using a printer, a VTR, or the like.
Further, the image processor 300 can use a buzzer or a color monitor 220 to generate an alarm by an alarm sound or a message display when the detected temperature data exceeds a preset upper and lower limit value.

FIG. 4 shows a configuration of an optical system and a circuit configuration of a signal processing system of a temperature display video camera according to an embodiment of the present invention.

First, the configuration of the temperature display unit 110 will be described. As is well known, a substance at a certain temperature emits infrared light having an intensity corresponding to the temperature. This temperature measuring unit 110 measures the intensity of the infrared light,
This is a measuring device for determining the temperature of the measurement object 200. This optical system adopts a single-lens reflex system as shown in FIG.
It is internally separated into a viewfinder (optical viewfinder) system and a temperature sensor system. The light from the measuring object 200 that has passed through the protective filter 401 that protects the internal optical system from external dust and the like is transmitted to the finder / AF (autofocus; autofocus, point) objective lens 4 of the refractive optical system.
02 performs automatic focusing. Objective lens 40
The center light surrounding the optical axis of No. 2 is reflected by a finder system half mirror 4O3 arranged on the optical axis, and this reflected light is used as a light beam for imaging by a camera. 1 through the scale glass 405 and the eyepiece system 406.
Image.

On the other hand, the light flux on the outer periphery of the objective lens 402 is
Avoid the optical system including the viewfinder mirror 403,
A temperature sensor (for example, a thermopile) through a control plate 411 and a spectral sensitivity correction filter 412 in the form of a reflective telescope via a spherical mirror (a temperature measuring objective lens of a reflective optical system) 410 with a hole in the center provided behind it. 413, and an image within the temperature measurement range is formed on the sensor 413.

As described above, the temperature measuring sensor 413, which is a detecting element, is provided at the focal position of the reflection optical system (temperature measuring objective lens), while a measurement area mark is provided at an equivalent position of the finder optical system. Glass plate (scale glass) 4
05 and a display unit 417 for digitally displaying temperature measurement data are provided. That is, a signal from the temperature measurement sensor 413 is converted into a digital temperature, and the signal is converted into a numerical character representation.
It is arranged so that it becomes.

The radiant energy from the measuring object 200 is converted into a voltage by the temperature sensor 413 through the above optical system,
Next, the amplifier 414 amplifies the voltage, and then A / A
The digitalization is performed by a D (analog / digital) conversion unit 415, and the microcomputer unit 416 performs necessary processing on the digital value. The temperature data thus detected is sent from the microcomputer unit 415 to the display unit 4 using liquid crystal or LEDs (light emitting diodes).
17 and digitally displayed.

The microcomputer section 416 further controls an infrared light emitting section 420 for outputting infrared rays for automatic focusing and an optical control section 418 for moving the objective lens 402. The infrared light emitted from the infrared light emitting section 420 and reflected by the measurement object 200 is detected by the sensor 413, and the video camera 1
The distance between 00 and the measurement object 200 is measured by the microcomputer unit 416. Microcomputer section 416
Then, a drive command corresponding to the distance data (or a difference value between the current distance data and the previous distance data) is sent to the optical control unit 418. The optical control unit 418 moves the control mechanism of the objective lens 402 in response to the command, thereby automatically performing focusing. When the focus is achieved, the infrared light emitting section 420 is turned off once, and the microcomputer section 416 displays on the display section 417 only the temperature data after the focus is achieved. The operations of the auto focus and the temperature measurement are alternately repeated in a time division manner. Since the automatic focusing method is employed, more accurate measurement data is always displayed stably. As the automatic focusing method, in addition to such an infrared method, an ultrasonic method, a phase difference method, a hill-climbing method, and the like are known. Of course, any method can be applied to the present invention.

By the way, the ratio of the infrared intensity of a certain measurement object to the infrared intensity of a black body at the same temperature is called emissivity, and the value of the emissivity differs depending on the measurement wavelength range. In order to measure the temperature accurately, it is necessary to set the emissivity according to the measurement wavelength range of the light receiving system of the measuring instrument. Therefore, in this temperature display unit 110, the emissivity of the operation unit /
Alarm key, up key, down key (not shown)
Allows you to set this value. The information of such various key switches is also processed by the microcomputer unit 416.

Next, the configuration of the CCD television camera 120 will be described. The television camera 120 is a camera having a fixed-focus optical lens system 121 that can simultaneously put an object scene image and a temperature digital display unit of the temperature display unit 110 into an imaging range and simultaneously focus and image. is there. The optical image that has passed through the optical lens system 121 is formed on the CCD image sensor 430, and is converted into an electrical RGB (red, green, blue) analog image signal. This image signal is sampled by a sample-and-hold circuit 431, digitized by an A / D converter 432, and then subjected to predetermined digital processing required for television video signal conversion by a digital processing circuit 433.
The signal is converted into an analog video signal by an A (digital / analog) converter 434. This video signal is supplied to a video output amplifier 4
After being amplified at 35, it is output to the video output connector 122 and sent to the color monitor 220 via the signal cable 210, for example, as shown in FIG. 436 is a clock generator, and 437 is a timing pulse generator.

FIG. 5 shows an example of the appearance when the above-mentioned temperature display video camera 100 of the present invention is mounted on a pan-tilt table 500. Pan-tilt table 500 is a video camera 1OO
Perform pan (left-right rotation) and tilt (vertical swing) operations by remote control or automatic control in a predetermined pattern. This makes it possible to measure the temperature at an arbitrary position on the measured object, and to measure a plurality of measurement positions sequentially by automatically moving the camera. As described above, the apparatus according to the embodiment is formed into one housing in a normal camera format, and can be installed on a normal remote control head.

(Other Embodiments) The temperature display unit is preferably of the automatic focus type as described above when the non-measurement object moves, but is manually adjusted for the stationary measurement object. Adjustment or a fixed focus method can be performed sufficiently. In the embodiments of the present invention, a signal cable is exemplified as a signal transmission unit, but wireless or optical communication may be used.

[0030]

As described above, according to the present invention,
Since the temperature of the test object present in a part of the field is remotely measured, the measurement result is digitally displayed, and together with the visible light image by the imaging optical system, the image is taken by a television camera. For example, when used for monitoring, it is possible to remotely measure the temperature of any part of the monitoring range with high accuracy, and to use it for new applications (for example, monitoring the operation status of equipment, recording video of temperature management, Etc.).

As a preferred example of the use of the present invention, there is a temperature monitoring of a turning point of a lathe.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire appearance of a temperature display video camera according to one embodiment of the present invention, in which a housing portion is partially cut away.

FIG. 2 is a configuration diagram showing an example of a configuration of an image / temperature monitoring system using the temperature display video camera 100 of FIG. 1;

FIG. 3 is a configuration diagram showing a modification of the configuration of the image / temperature monitoring system.

FIG. 4 is a block diagram showing a configuration of an optical system and a circuit configuration of a signal processing system of the temperature display video camera according to one embodiment of the present invention.

FIG. 5 is a perspective view showing an example of the appearance when the temperature display video camera 100 of the present invention is mounted on a pan-tilt table 500.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 temperature display video camera 110 temperature display unit 112 finder section 120 CCD television camera 121 lens system (optical system lens) 122 video output connector 200 temperature measuring object 210 signal cable 220 color monitor 300 image processing processor 402 finder / AF objective lens ( Refractive optical system) 405 Scale glass 406 Eyepiece lens system 410 Temperature measuring objective lens (reflective optical system) 412 Spectral sensitivity correction filter 413 Temperature measuring sensor 415 A / D conversion unit 416 Microcomputer unit 417 Digital display unit 418 Optical control unit 420 Infrared ray Light-emitting unit 430 CCD imaging device 433 Digital processing circuit 500 Pan-tilt table

Claims (8)

(57) [Claims] 1. A reflection optical system for introducing light from a test object and forming an image, an infrared detector arranged near a position of the test object image formed by the reflection optical system, and the infrared detection A temperature display unit for receiving the signal from the detector and calculating the temperature of the test object, and displaying the calculated temperature; and a temperature display unit on the incident side optical axis of the reflection optical system, from the test object. A finder optical system including a mirror that reflects light; and an eyepiece lens on which a display surface of the temperature display unit is arranged, and the display surface and the image of the test object are arranged in the same field of view in the finder optical system. A thermometer unit that includes a system, and a television camera that is arranged in an eyepiece of the eyepiece lens system and captures an image of the test object image and a display surface of the temperature display unit in the same field of view. And temperature display video camera. 2. The temperature display video camera according to claim 1, wherein the finder optical system has an automatic focusing mechanism. 3. The video camera of claim 2, wherein the television camera is a fixed focus camera. 4. The temperature display video camera according to claim 1, wherein the thermometer unit and the television camera are housed in the same housing. 5. The television camera according to claim 1, wherein the television camera is mounted on a pan-tilt base that performs a pan and tilt operation by remote control or automatic control in a predetermined pattern. Temperature display video camera. 6. The television camera according to claim 1, wherein the television camera is connected to a monitoring center for displaying an image of a television video signal from the television camera via signal transmission means. The temperature display video camera described in 1. 7. The monitoring center according to claim 6, wherein the monitoring center has an image processing device that recognizes a display temperature of the temperature display unit by signal processing of the television image signal and outputs detected temperature data. Temperature display video camera. 8. The video camera according to claim 7, wherein the monitoring center has an alarm device that generates an alarm according to the detected temperature data.