JPH0422573B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention monitors an image of a subject captured by a video camera and an image obtained by converting biological signals into video signals simultaneously on the same screen. video data
Regarding a biological monitoring recording device that records on a VTR.

[Summary of the invention]

The present invention simultaneously monitors the image of the subject captured by a video camera and the image obtained by converting the biosignal from the biosignal detector into a video signal on the same screen, and further records the video data on a VTR. A biological monitoring recording device comprising: a first conversion circuit that converts a video signal from the video camera or a video signal recorded on the VTR into a non-interlaced video signal; a second conversion circuit that converts the signal or a biological signal recorded in a recording unit separate from the video signal from the video camera in the VTR into a non-interlaced video signal; and these first and second conversion circuits. By configuring a video signal synthesis circuit that synthesizes non-interlaced video signals from the video signal synthesis circuit and a monitor device that displays the synthesized video signal from the video signal synthesis circuit as a composite image on the same screen, the monitor We have improved the image quality of the composite image displayed by the device, and we have also made it possible to reliably display the biological waveform even if the transition of the biological waveform is frozen (stopped), making it possible to perform clear biological measurements. be.

[Conventional technology]

In various fields of biometry, including approximation and electroencephalogram measurement, there is an increasing need to decipher biosignals while monitoring subjects. Particularly when measuring patients with epilepsy, simultaneous comparison of changes in the subject before and after seizures with biological signals can provide clear interpretation. A biological monitoring recording device is known as a medical monitoring device mainly for such purposes.

As shown in FIG. 4, the conventional biological monitoring recording device includes a biological signal detection unit (such as an electroencephalogram, a _cardiac electric meter, etc.) 22
, a waveform memory 23 that converts the amplified biological signal _s2 from the biological signal detection unit 22 into a video signal (biological waveform) _v1 , a video camera 24 that monitors the subject 21, and a A video signal synthesis circuit 25 synthesizes the video signal v ₁ and the video signal v ₂ from the video camera 24, and the composite video signal V from the video signal synthesis circuit 25 is transferred to the video recording section VT (seventh section) on the surface layer of the video tape T. (see figure)
It is composed of a VTR 26 and a monitor device 27 that displays the composite video signal V from the video signal synthesis circuit 25 as a composite image on the same screen.

That is, an electrode is attached to the subject 21, and a biosignal _s1 such as an electroencephalogram detected from the electrode is amplified by the biosignal detection unit 22. And biological signal detection section 22
Number of channels (generally 14 channels) output from
The amplified biological signal (analog waveform) _s2 is converted into a video signal _v1 in the waveform memory 23. This waveform memory 23 converts the biological signal (analog signal) s ₂ into a digital signal using an A/D converter, and then stores it in a video RAM (image memory) corresponding to one screen, corresponding to the pixels of the monitor device 27. A video signal that creates a screen (waveform) in place of a 1-bit signal
Convert to v ₁ . On the other hand, the video signal v ₂ from the video camera 24 that captured the subject 21 is stored in the waveform memory 23.
The video signal is synthesized together with the video signal v ₁ from the video signal synthesis circuit 25 at the next stage. Then, the composite video signal V from the video signal synthesis circuit 25 is recorded by the VTR 26 and displayed on the same screen as a composite image by the monitor device 27. Furthermore, by playing back the VTR 26, the recorded biological waveform and the composite image of the subject 21 can be displayed on the same screen on the monitor device 27. According to this biological monitoring recording device, as shown in Fig. 5, it is possible to create an image in which the image of the subject 21 and the biological waveform are combined, and changes in the subject 21 and biological signals can be recorded simultaneously on the same screen. can be monitored.

[Problem to be solved by the invention]

However, the video camera 24, VTR 26, and monitor device 27 used in the conventional biological monitoring and recording device use an interlaced scanning video system. In this interlaced scanning, as shown in FIG. 6, every other scanning line l is scanned to complete one complete screen (frame) with odd and even fields. Therefore, the number of scanning lines in one field is
With 262.5 frames, one screen is 30 frames per second.

Usually, in biological monitoring recording equipment,
In order to make the display of the biological waveform easier to see, it is necessary to increase the contrast between the biological waveform and the background (that is, to make the waveform brighter and the background darker). However, in conventional biological monitoring and recording devices, scanning is performed using an interlaced method as described above, and therefore, when the contrast is increased, line flickering peculiar to the interlaced method becomes noticeable.

Regarding the playback of recorded video tapes,
There are cases where the tape feed of the VTR 26 is temporarily stopped (paused) to check the image of the biological waveform. In this case, as shown in FIG. 7, the VTR 26 can only reproduce half of one screen, that is, the odd numbered fields (or even numbered fields), which causes the disadvantage that the waveform appears interrupted or cannot be seen at all when the amplitude of the waveform is small. occurs.

As described above, the conventional playback monitoring and recording apparatus uses the interlaced method, so it has the disadvantage that the image quality deteriorates significantly and clear biological measurements cannot be made.

The present invention has been made in view of the above points, and its purpose is to improve the image quality of a composite image displayed from a monitor device, and to
To provide a biological monitoring and recording device that can reliably display a biological waveform even if the transition of the biological waveform is frozen (stopped) and can perform clear biological measurements.

[Means to solve the problem]

The present invention simultaneously monitors the image of the subject 1 captured by the video camera 3 and the image obtained by converting the biosignal from the biosignal detection unit 2 into a video signal on the same screen, and further displays the video data. In the biological monitoring recording device A, which _is recorded on a VTR ₅ , _a first conversion circuit ( The scan converter 7) converts the biosignal s ₂ from the biosignal detection unit 2 or the biosignal s _r recorded in a recording unit separate from the video signal v ₁ from the video camera 3 in the VTR 5 into a non-interlaced video. signal v _o2
a second conversion circuit (waveform memory 8) that converts into
A video signal synthesis circuit 9 synthesizes the non-interlaced video signals v _o1 and v _o2 from the first and second conversion circuits 7 and 8, and a synthesized image signal V from the video signal synthesis circuit 9 is synthesized. and a monitor device 10 that displays images on the same screen.

[Effect]

In the above-mentioned biological monitoring recording device A of the present invention, the video signal _v1 from the interlaced video camera 3 is converted into a non-interlaced video signal _v01 by the first conversion circuit 7, and the biological signal is detected. The biological signal _s2 from the unit 2 is converted into a non-interlaced video signal (biological waveform) v _o2 by the second conversion circuit 8, and these video signals v _o1 and v _o2 are combined and monitored. On the other hand, regarding the recording of VTR5, the video signal from video camera 3 v ₁
and the biosignal s2 from the biosignal detection unit ₂ are recorded in separate recording units. For example, the video signal v ₁ from the video camera 3 is transferred to the video recording section VT of the video tape T.
The biological signal _s2 from the biological signal detection section 2 is recorded in the audio recording section AT. and,
When playing back the VTR 5, the video signal v _r played back from the video recording unit VT is converted into a non-interlaced video signal v _o1 by the first conversion circuit 7, and the biological signal s _r played back from the audio recording unit AT is converted into a non-interlaced video signal v o1. The second conversion circuit 8 converts it into a non-interlaced video signal (biological waveform) v _o2 , and similarly to the above, these video signals v _o1 and v _o2 are combined and monitored.

According to the configuration of the present invention, raster roughness and line flickering caused by the interlacing method are eliminated by the double-density non-interlacing method, and the image quality of the composite image displayed on the monitor device 10 is improved. can be achieved. Also, when recording data to the VTR5, biological signals s ₂
is recorded separately from the video signal v ₁ of subject 1, and recorded on the VTR.
When playing VTR 5, the video of Subject 1 and the video of the biological waveform are combined, so if you want to freeze (stop) the transition of the biological waveform, you do not have to pause (pause) the VTR 5. Only the waveform can be frozen, and the biological waveform can be reliably displayed. Furthermore, the display portion of the biological waveform does not cause deterioration in image quality due to reproduction on the VTR 5.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a block diagram showing the configuration of a biological monitoring recording apparatus A according to this embodiment.

As shown in the figure, this biomonitoring recording device _A includes a biosignal detection unit (e.g., an electroencephalogram, electrocardiograph, etc.) 2, and a video camera 3 that monitors the subject 1
and a modem circuit 4 that modulates or demodulates the amplified several-channel biosignal _s2 from the biosignal detection unit 2.
and a VTR 5 which records the video signal _v1 from the video camera 3 onto the video recording section of the videotape, and records the modulated signal (biological signal) _sn from the modem circuit 4 onto the audio recording section of the videotape; A switch 6a that selectively switches between the biological signal s2 from the biological signal detection unit ₂ and the demodulated signal (biological signal) _sd from the modem circuit 4, and the video signal _v1 from the video camera 3.
and a switch 6b that selectively switches the reproduced video signal v _r from the VTR 5.
and the video signal v ₁ from the video camera 3, or
a scan converter 7 that converts the reproduced video signal v _r from the VTR 5 into a non-interlaced video signal v _o1 ; a biosignal s 2 from the biosignal generator ₂ ;
Alternatively, a waveform memory 8 converts the demodulated signal _sd from the modem circuit 4 into a non-interlaced video signal (biological waveform) v _o2 , a video signal v _o1 from the scan converter 7, and a video signal v _o2 from the waveform memory 8. The video signal synthesis circuit 9 is composed of a video signal synthesis circuit 9 that synthesizes the video signal synthesis circuit 9, and a high scan monitor device 10 that supports non-interlacing and displays the synthesized video signal V from the video signal synthesis circuit 9 on the same screen as a composite image. still,
The modem circuit 4 modulates the biological signal _s2 having a high frequency component outside the voice band into a signal having a frequency component within the voice band, or modulates the biological signal s2 which has been modulated to have a frequency component within the voice band. The system demodulates the biosignal into the biosignal.

Therefore, the interlaced video signal v ₁ captured by the video camera 3 of the subject 1 is converted into a non-interlaced video signal v _o1 by the scan converter 7, and the signal from the electrode attached to the subject 1 is converted into a non-interlaced video signal v o1. After the biosignal s ₁ is amplified by the biosignal detection unit 2,
It is converted into a non-interlaced video signal (biological waveform) v _o2 in the waveform memory 8 (see FIG. 3). Here, as shown in FIG. 2, the scan converter 7 includes a Y/C separation circuit 11, a timing generation circuit 12, an A/D converter 13, and a control circuit 14.
, a line memory 15 , and a D/A converter 16 . Note that Y indicates a luminance signal and C indicates a color signal.
Then, the interlaced video signal _v1 from the video camera 3 is sent to the Y/C separation circuit 11 as an RGB signal.
v _R , v _G and v _B are converted into a composite synchronizing signal s _t , of which the RGB signals v _R , v _G and v _B are converted to an A/D converter 13
and a composite synchronization signal _st to the timing generation circuit 12. A timing generation circuit 12 generates a clock C and a control signal s _c necessary for each circuit, ie, an A/D converter 13 and a control circuit 1.
4 and the D/A converter 16. The RGB signals v _R , v _G and v _B from the Y/C separation circuit 11 are A/
After being converted into digital signals d _R , d _G and d _B by the D converter 13 , they are supplied to the control circuit 14 . The control circuit 14 sequentially sends the digital signals d _R , d _G and d _B from the A/D converter 13 to the line memory 15 , writes them into the memory for one scanning line (line), and performs line interpolation, for example. Converts a 15.7kHz interlaced signal to a 31.5kHz non-interlaced signal. The line memory 15 may be replaced with a frame memory. In this case, since the video signal v ₁ input to the scan converter 7 is an interlaced video signal, two systems of video signals, an odd field and an even field, are input to the clock C and control signal from the timing generation circuit 12. Write while performing double density conversion according to s _c . Therefore, the line memory 15
Alternatively, the frame memory stores double-density digital RGB signals, that is, RGB signals for one frame. After that, the control circuit 14
is data (digital RGB signals d _R , _DG and d _B ) from the line memory 15 or frame memory in accordance with the clock C from the timing generation circuit 12 and the control circuit _sc in accordance with the non-interlace method.
is read out and supplied to the D/A converter 16 at the next stage. Then, the control circuit 14 at the D/A converter 16
Convert the digital RGB signals d _R , d _G and d _B from , into analog RGB signals a _R , a _G and a _B to obtain a non-interlaced video signal v _o1 .

In addition, the waveform memory 8 converts the biological signal (analog signal) _s1 from the biological signal detector 2 into a digital signal using an A/D converter, and then stores one screen in a corresponding video RAM (image memory). , the 1-bit signal corresponding to the pixel of the monitor device 10 is converted into a video signal _vo2 for creating a screen (waveform).
At this time, the waveform memory 8 outputs a non-interlaced video signal _vo2 because the conversion is performed at twice the horizontal frequency as in the normal (interlace format).

Then, the non-interlaced video signals v _o1 and v _o2 from the scan converter 7 and the waveform memory 8 are combined in the next stage video signal synthesis circuit 9, and then the combined video signal V is sent to the next stage high scan monitor device. At step 10, as shown in FIG. 5, the composite image is displayed on the same screen. Monitor device 10
The scanning method in is a non-interlace method, and as shown in Figure 3, this non-interlace method doubles the horizontal frequency and doubles the number of scanning lines per field while keeping the field frequency (vertical frequency) the same. Make it. This results in 1
The density per scanning line is doubled and line flicker is improved.

On the other hand, when recording on the VTR 5, the video signal _v1 from the video camera 3 that captured the subject 1 is directly transferred to the video recording section on the surface layer of the videotape T.
Record to VT via video head VH (7th
(see figure). This recorded video does not include any biological waveform video. The biological waveform is generated by modulating the biological signal _s2 from the biological signal detection unit 2 with the modem circuit 4 and transmitting it to the VTR 5.
At this point, recording is made to the deep audio recording section AT of the videotape T via the audio head AH (see FIG. 7). That is, the video of the subject 1 and the biological signal _s2 are recorded separately in the VTR 5.

Next, when playing back the VTR 5, the switches 6a and 6b of the switching section 6 are switched in the direction shown by the broken lines, so that the input of the scan converter 7 changes from the video signal _v1 from the video camera 3 to the VTR 5. The input of the waveform memory ₈ is changed from the biosignal signal s2 from the biosignal detector ₂ to the playback biosignal _sr from the VTR 5 (more precisely, the demodulated signal s from the modem circuit 4). _d ). In particular, the reproduced biological signal s _r is demodulated into a biological signal s _d by an intermediate modem circuit 4 and then supplied to the waveform memory 8 . The reproduced video signal v _r from the VTR 5 is converted into a non-interlaced video signal v _o1 by the scan converter 7, and the biological signal s _d from the modem circuit 4 is converted into a non-interlaced video signal v by the waveform memory 8. converted to _o2 .
Thereafter, the non-interlaced video signal v _o1 from the scan converter 7 and the waveform memory 8 and
After _vo2 is synthesized by the next-stage video signal synthesis circuit 9, the synthesized video signal V is displayed on the same screen as a synthesized image by the next-stage high-scan monitor device 10.

Moreover, when trying to stop the biological waveform image during playback of the VTR 5, the operation of the waveform memory 8 is frozen (stopped). That is, in the waveform memory 8,
Writing of data to the video RAM is prohibited and only reading from the video RAM is performed.

As described above, according to this example, the video signal v ₁ from the interlaced video camera 3 is converted into the non-interlaced video signal v _{o 1} by the scan converter 7, and the biological signal detection unit 2
Convert the biosignal _s2 from the waveform memory 8 into a non-interlaced video signal (biological waveform) _vo2 ,
Since these video signals v _o1 and v _o2 are combined and monitored, the raster roughness and line flicker caused by the interlace method are eliminated by the double density non-interlace method, and the monitor device 10 The image quality of the composite image displayed can be improved. Therefore, even if the contrast between the waveform and the background is strengthened, flickering and the like will not be noticeable, making it possible to make the display of the biological waveform easier to see.

Regarding the recording of the VTR 5, the video signal _v1 from the video camera 3 and the biosignal _s2 from the biosignal detector 2 are stored in separate recording sections and recorded.
For example, the video signal _v1 from the video camera 3 is recorded on the video recording section VT of the videotape, and the biosignal s2 from the biosignal detection section ₂ is recorded on the audio recording section.
Record on AT. When playing back the VTR5, the playback video signal played from the video recording unit VT
The scan converter 7 converts v _r into a non-interlaced video signal v _o1 , and the audio recording section
After demodulating the biological signal s _r reproduced from the AT via the modem circuit 4, it is converted into a non-interlaced video signal (biological waveform) v _o2 in the waveform memory 8,
Similarly to the above, these video signals v _o1 and v _o2 are combined and monitored. That is, when recording data on the VTR 5, the biological signal _s2 is recorded separately from the video signal v1 of the patient ₁ , and when the VTR 5 is played back, the video of the patient 1 and the video of the biological waveform are combined. I did it like this,
If you want to freeze (stop) the transition of the biological waveform, you can do so without pausing the VTR5.
It becomes possible to freeze only the biological waveform.
Therefore, the waveform image may be displayed intermittently, or
There is no possibility that the still image is not displayed at all, and the still image of the biological waveform can be displayed reliably and clearly.

〔Effect of the invention〕

According to the biological monitoring recording device of the present invention,
It is possible to improve the image quality of the composite image of the subject and biological waveform displayed from the monitor device, and
Even if the transition of the biological waveform is frozen, the biological waveform can be displayed reliably and clearly, and clear biological measurements can be performed.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a biological monitoring recording device according to this embodiment, Fig. 2 is a block diagram showing a scan converter according to this embodiment, and Fig. 3 is an explanation showing a non-interlace method according to this embodiment. 4 is a block diagram showing a conventional biological monitoring recording device, FIG. 5 is an explanatory diagram showing an example of a monitor screen, FIG. 6 is an explanatory diagram showing an interlaced system, and FIG. 7 is a video tape FIG. A is the biological monitoring recording device, 1 is the subject,
2 is a biological signal detection section, 3 is a video camera, 4 is a modem circuit, 5 is a VTR, 6 is a switching section, 7
is a scan converter, 8 is a waveform memory, 9 is a video signal synthesis circuit, 10 is a high scan monitor device, 11 is a Y/C separation circuit, 12 is a timing generation circuit, 13 is an A/D converter, and 14 is a control circuit. ,
15 is a line memory, and 16 is a D/A converter.

Claims (1)

[Claims] 1. An image captured by a video camera of the subject and an image obtained by converting the biological signal from the biological signal detection unit into a video signal are simultaneously monitored on the same screen, and the video data is In a biological monitoring recording device that is recorded on a VTR, the video signal from the above video camera or the above
A first conversion circuit that converts a video signal recorded on the VTR into a non-interlaced video signal, and a biological signal from the biological signal detection section, or the biological signal from the VTR.
a second conversion circuit that converts the biological signal recorded in a recording unit separate from the video signal from the video camera into a non-interlace video signal; and a non-interlace conversion circuit from these first and second conversion circuits. A biological monitoring device comprising: a video signal synthesis circuit that synthesizes video signals obtained by combining the video signals; and a monitor device that displays the synthesized video signals from the video signal synthesis circuit as a composite image on the same screen.