JPH02117281A - Infrared image pickup device - Google Patents

Abstract

PURPOSE:To prevent the turbulence of a display picture even when the range of an oscillation angle and an oscillation speed are fluctuated by generating a sampling signal in correspondence to the absolute angle information of an image pickup means. CONSTITUTION:An angle information presenting means 117 outputs angle information 115 in the turning condition of an image pickup means 113. Based on these information 115, an angle detecting means 121 detects the absolute angle of the means 113 and outputs absolute angle information 119. In correspondence to these information 119, a sampling signal generating means 125 generates a sampling signal 123. In a sampling means 127, picture information 111 are sampled in correspondence to the signal 123 and outputted as digital information to a display means. Thus, since the signal 123 is generated in correspondence to the information 119 of the means 113, the turbulence of the picture is not generated in a display means to display the digital information even when the range of the oscillation angle and the oscillation speed are fluctuated in the means 113.

Description

[Detailed Description of the Invention] [1 Required] In particular, the present invention relates to an infrared imaging device that obtains an infrared imaging signal of an observation target, and the displayed image is not disturbed even if there are fluctuations in the swing angle range or swing speed. ↑ An imaging means that outputs infrared image information of the observation target while being rotated by a driving means, and an angular information providing unit that is connected to the imaging means and outputs angle information in the rotating state. an angle detection means for detecting the absolute angle of the imaging means based on the angle information and outputting the absolute angle information; a sampling signal generation means for generating a sampling signal according to the absolute angle information; The apparatus is configured to include a sampling means for sampling video information according to a sampling signal and outputting the sampled image information to a display means as digital information.

[Industrial application field]

The present invention relates to an infrared imaging device that obtains an infrared imaging signal of an observation target.

[Conventional technology]

Conventionally, when obtaining an infrared image of an observation target, an infrared camera sensor included in an infrared imaging device is swung at a constant speed within a certain angular range (field of view), and an image signal (analog signal) is obtained. get. Sampling pulses are generated at regular time intervals determined in relation to the field of view range and the swing speed, and the imaging signal (analog signal) is sampled and converted into a video signal (digital signal). The video signal obtained by such a conversion operation is subjected to necessary processing and displayed as an image on a television monitor or the like.

In such a configuration, if the sampling pulse generation point and pulse period are shifted relative to the viewing range and shake speed, jitter will occur in the video signal (digital signal), so it will not be possible to display a high-quality image on the television monitor screen. You will not be able to obtain a clear image.

A major factor causing such jitter is a mechanical problem that causes the infrared camera sensor to swing, and is a variation in the angular range (field of view) and its speed.

However, it is actually extremely difficult to eliminate such fluctuations. Therefore, a sampling pulse generation technique that is devised so that even such fluctuations do not affect the video signal (digital signal) is required.

The conventional sampling pulse generation method involves swinging an infrared camera sensor, especially the scan mirror included in it, within a predetermined angular range (field of view), detecting the center position of the scan mirror, and then generating an image based on the center detection pulse. There is a system that uses a sampling pulse setting ROM that replaces sampling points (sample points) with time intervals to set them as time intervals.

[Problem to be solved by the invention]

By the way, in the infrared imaging device using the above-mentioned conventional sampling pulse generation method, the sampling pulse is determined only by the temporal timing, so the range of the deflection angle and the deflection speed as described above are limited. There is a problem in that jitter occurs due to the fluctuation, resulting in a disturbed displayed image.

The present invention was created in view of the above points, and an object of the present invention is to provide an infrared imaging device in which the displayed image is not disturbed even if there are fluctuations in the range of vibration angle or speed. .

[Means to solve the problem]

FIG. 1 is a block diagram of the principle of an infrared imaging device according to the present invention.

In the figure, an imaging means 113 outputs infrared image information 111 of an observation target while being rotated by a driving means.

Angle information providing means 117 is connected to imaging means 113 and outputs angle information 115 in its rotational state.

Angle detection means 121 detects the absolute angle of imaging means 113 based on angle information 115 and outputs absolute angle information 119.

The sampling signal generating means 125 generates the absolute angle information 11
9, a sampling signal 123 is generated.

The sampling means 127 samples the video information 111 obtained by the imaging means 113 according to the sampling signal 123, and outputs the sampled information as digital information to the display means.

Therefore, as a whole, the absolute angle information 119 of the imaging means 113 is obtained based on the angle information 115, and the sampling signal 123 is generated accordingly.

[For production]

Imaging means 11 to which angle information providing means 117 is connected
3 is rotated (for example, swung within a desired angle range), and depending on the angular state, infrared image information 1 of the observation target is displayed.
11 is output. The video information 111 is the sampling means 127
supplied to

Further, the angle information providing means 117 outputs angle information 115 regarding the rotating state of the imaging means 113. Based on this angle information 115, the angle detection means 121 detects the image pickup means 1.
13 and outputs absolute angle information 119. The sampling signal generating means 125 generates a sampling signal 123 in accordance with this absolute angle information 119.

The sampling means 127 samples the video information 111 according to the sampling signal 123 and outputs it as digital information to the display means.

In the present invention, since the sampling signal 123 is generated in accordance with the absolute angle information 119 of the imaging means 113, even if there is a fluctuation in the range of the deflection angle or the deflection speed of the imaging means 113, There is no image disturbance on the display means for displaying digital information.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 2 shows the configuration of an infrared imaging device according to an embodiment of the present invention.

FIG. 3(a) shows the configuration of a sampling signal generating portion in the infrared imaging device of the embodiment shown in FIG.

(1) Here, the correspondence between the embodiment of the present invention and FIG. 1 will be shown.

The video information 111 corresponds to the infrared video signal 253.

The imaging means 113 includes a scan mirror 211. This corresponds to the infrared detector 251.

The angle information 115 corresponds to the angle signal 217.

The angle information providing means 117 corresponds to the resolver 215.

The absolute angle information 119 corresponds to the absolute angle detection signal 221.

The angle detection means 121 corresponds to the mirror deflection angle detection circuit 219.

The sampling signal 123 is the sampling pulse signal 2
It corresponds to 25.

The sampling signal generation means 125 corresponds to the sampling pulse calculation circuit 223.

The sampling means 127 includes a timing controller 227,
Multiplexer 255. Analog-digital converter 2
It corresponds to 71.

The display means is the digital signal control section 273. It corresponds to the television monitor 285.

Examples of the present invention will be described below assuming that the correspondence relationship as described above exists.

■, -1 and - Please refer to FIG. 2 and FIG. 3 (b).

In the infrared imaging device according to this embodiment, a scan mirror 211 included in an infrared camera sensor (not shown)
is rotated by a motor 213 within a predetermined deflection angle range (field of view range), and a resolver 215 directly connected to the motor 213 detects the rotation state of the scan mirror 211 and generates an angle signal 217 based on the rotation state of the scan mirror 211 to output an angle signal 217 to adjust the mirror. It is supplied to the swing angle detection circuit 219. The mirror swing angle detection circuit 219 detects the movement based on the pulse of the angle signal 217 and outputs a digitalized absolute angle detection signal 221, which is supplied to the sampling pulse calculation circuit 223.

The sampling pulse calculation circuit 223 has a sampling angle preset value SP (for example, a value of “5”) by a setting section (not shown).
12°”), the interval and number of sampling pulses are calculated according to the sample angle preset value SP and the desired function, and a sampling pulse signal 225 is provided to the timing controller 227.

Further, an angle signal is supplied to a motor control section 229 according to the detected angle obtained by the mirror swing angle detection circuit 219, and the motor control section 229 controls the motor 213. Through such loop control, the scanning mirror 2
The vibration speed is controlled within eleven vibration angle ranges.

The scan mirror 211 driven by the motor 213 under rotation control as described above is rotated within a predetermined deflection angle range (field of view range).

In response to the deflection of the scan mirror 211, infrared rays from a subject 240, which is an observation target, are collected by a lens 231 and detected by an infrared detector 251. Here, depending on the shake of the scan mirror 211, there are a plurality of infrared detection states within the field of view of the infrared camera. A plurality of infrared video signals 253 (analog signals) corresponding to each of the plurality of infrared detection states are sent to the infrared detector 2.
51 and is supplied to the next stage multiplexer 255.

Timing controller 227 generates timing signal 261 at a desired point in time according to sampling pulse signal 225. This timing signal 261 is connected to a cascaded multiplexer 255 and an analog-to-digital converter 2.
71 and the digital signal control unit 273, respectively.

Multiplexer 25 to which infrared video signal 253 is supplied
5 switches to select one of the plurality of infrared video signals 253 according to the timing signal 261 and outputs the selected video signal 281 to the analog/digital converter 271. The selected video signal 281 selected here is an analog signal, and the analog-to-digital converter 271 samples and converts it into bamboo according to the supplied timing signal 261, and sends the digitally converted digital video signal 283 to the next stage. The signal is supplied to the digital signal control section 273 of. The digital signal control unit 273 performs necessary processing on the digitized digital video signal 283 based on the timing of the timing signal 261, restores it to an analog signal, obtains an image signal, and displays the image signal on the television monitor 285. The image of the subject 240 is displayed on the screen.

Now, the deflection angle of the scan mirror 211 by the motor 213, the corresponding numerical value of the absolute angle detection signal 221 obtained by the mirror deflection angle detection circuit 219, and the timing of the sampling pulse signal 225 outputted by the sampling pulse calculation circuit 223. is shown in Figure 3 (b).

As shown in FIG. 3, when the scan mirror 211 is swung by a motor 213 at a predetermined speed and by a predetermined angle left and right with the center of the field of view as the center of deflection, the mirror is The swing angle detection circuit 219 sets the angle information corresponding to the absolute angle to 0", for example.
~ "4095" is output as a value. This value is output as the absolute angle detection signal 221 & the sampling pulse calculation circuit 22.
3, so based on the angle information corresponding to the absolute angle and considering the sample angle precent value SP, when the deflection to the left is maximum, the value becomes "512" and the first sampling pulse is... ..., the value "'2 at the center of the runout
048″° and the 128th sampling pulse...
..., value "' 3584 when the swing to the right is maximum
”, and the sampling pulse signal 225 is calculated and generated so as to become the 256th sampling pulse.

In this way, the angle signal 217 from the resolver 215
In accordance with each sampling pulse of the sampling pulse signal 225 obtained from the sampling pulse calculation circuit 223 in accordance with the multi-blefner 255 . Analog-to-digital converter 271 and digital signal control section 273 perform respective processing. Therefore, the scan mirror 21
Even if fluctuations occur in the range of the swing angle and the swing speed in 1, the timing at which the sampling pulse occurs and the pulse circulation are shifted in accordance with the fluctuations in the field of view range and the swing speed. Therefore, the influence of jitter caused by the vibration of the scan mirror 211 is removed,
The displayed image on the screen of the television monitor 285 will be of good quality.

Further, the rotation of the motor 213 is controlled based on the angle information detected by the mirror deflection angle detection circuit 219, and the deflection state of the scan mirror 211 is controlled. Since the motor 213 is driven by such a closed loop and the deflection angle range (field of view range) and speed of the scan mirror 211 are controlled, fluctuations in the deflection of the scan mirror 211 are reduced. Therefore, the timing between the deflection of the scan mirror 211 and the timing signal 261 can be adjusted well.

■ Mr. Nomon of 0-shot H, please note that in ``correspondence between RL, Example and Figure 1'',
Although the correspondence between the present invention and the embodiments has been described, those skilled in the art can easily imagine that the present invention is not limited to this and that there are various modifications.

[Effects of the Invention] As described above, according to the present invention, by generating a sampling signal according to the absolute angle information of the imaging means, the range of the deflection angle can be determined in the imaging means.

This is extremely useful in practice because jitter does not occur even if there is a fluctuation in the shake speed, and the displayed image is not disturbed.

[Brief explanation of drawings]

FIG. 1 is a principle block diagram of an infrared imaging device according to the present invention, FIG. 2 is a block diagram of the configuration of an infrared imaging device according to an embodiment of the present invention, and FIG. 3 is an infrared imaging system according to an embodiment of the present invention shown in FIG. FIG. 2 is a configuration diagram and an explanatory diagram of the operation of a sampling signal generation portion of the device. In the figure, 111 is video information, 113 is imaging means, 115 is angle information, 117 is angle information providing means, 119 is absolute angle information, 121 is angle detection means, 123 is a sampling signal, 125 is sampling signal generation means, 127 211 is a sampling means, 211 is a scan mirror 213 is a motor, 215 is a resolver, 217 is an angle signal, 219 is a mirror swing angle detection circuit, 221 is an absolute angle detection signal, 223 is a sampling pulse calculation circuit, 227 is a timing controller, 229 240 is an object, 251 is an infrared detector, 261 is a timing signal, 281 is a selected video signal, and 285 is a television monitor. Refer to the principles of the invention... Figure 1

Claims (1)

[Claims] (1) Imaging means (11) outputting infrared video information (111) of the observation target while being rotated by the driving means
3), and angle information providing means (115) connected to the imaging means (113) and outputting angle information (115) in its rotational state.
117), and the imaging means (11) based on the angle information (115).
Angle detection means (121) that detects the absolute angle of 3) and outputs absolute angle information (119);
a sampling signal generating means (125) that generates a sampling signal (123) according to the image capturing means (113);
Sampling means (1) for sampling according to the sampling signal (123) and outputting it to the display means as digital information.
27) An infrared imaging device characterized by being configured to include the following.