JPS60104207A - Object detecting device - Google Patents

Abstract

PURPOSE:To always set a dynamic range of a signal sent out to a processing circuit, to a prescribed value by controlling a dynamic range of an output signal of a holding device in accordance with a variation of a monitor area based on setting. CONSTITUTION:A video signal from a video camera 7 is held by a holding device 11 responding to a timing generating device 25 of an object detecting circuit 8. A video signal corresponding to a picture of a monitor area of an area corresponding to this setting is compared with a reference value by a comparing and deciding device 28, and whether an object exists or not is decided and detected. When a set area of a monitor area is varied by a range setting circuit 42 of a monitor area adjusting circuit 41, a control signal varied in reverse against a variation of an area is outputted from a dividing circuit 44, a range controlling circuit 46 is controlled, a dynamic range of a signal which is outputted from the device 11 and sent out to an A/D conversion device 26, etc. becomes a prescribed value, and even if the monitor area set contents are varied, whether an object exists or not can be detected satisfactorily without executing an adjustment, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an object detection device, and more particularly, to detecting whether an object is present or not within the three-dimensional space of a 19r lamp. It is something to detect.

[* JAt Handling Techniques 8: The Problem Is False] As an object detection ILI device that can detect objects without contacting them, the external appearance of the object is captured using a device 1 and 1g, and this image 1g is captured using a cathode ray It is displayed on the official page, and thus the y4 degree on the 隘＠1 蛛管 changes -1 due to the lack of word form.
-7-1 It has been considered in the past to confirm the presence or absence of an object by utilizing this phenomenon. However, in this way, cathode ray 1
Depending on the method of detecting y4 degrees above, the ysI on the display screen
Display 1n according to the sensor Z required for f-n detection.
1, and the use of relatively large cathode ray tubes, there is a problem in that there is a limit to the miniaturization of the overall structure.
Furthermore, depending on the state of the bag layer of σ Ruhinza, there is a risk that external noise may be mixed into the sensor and noise may be introduced into the result of the calculation.

As a method to solve this problem, among the screens obtained by video gg@ sent out from a video camera that images a three-dimensional space of It is conceivable to capture and hold the held output signal and compare it with the level yal-reference value to obtain object detection number 46 depending on the presence or absence of an object.In this way, the display screen of the cathode The above-mentioned problems can be effectively studied by being able to detect objects easily and without layering sensors.

However, in the case of this method, the hold output (gO) obtained from the hold device has, in principle, a value corresponding to the value of the video @ which corresponds to the monitoring area on the screen, and therefore the area of the monitoring area. If the value is changed, the width of change in the hold output signal, in other words, the dynamic range will be expanded or contracted depending on the magnitude.

When the dynamic range of each hold output is expanded or contracted in this way, the hole concerned must be expanded or contracted each time. Therefore, each time the monitoring area is changed for the processing circuit that has been adjusted to the optimal operating condition, a painstaking re-arranging process is required. There must be. In particular, if the area of the monitoring area becomes extremely large or small, there is a risk that the adjustable range of the processing circuit will be exceeded. It will have to be remodeled.

[Purpose of the invention]

The present invention has been made in consideration of the above 6W, and even when the surface #r of the monitoring area is changed, the dynamic range of the signal sent from the hold device to the processing circuit in the subsequent stage can be maintained at almost the same value. This is what we are trying to do.

[Summary of the invention]

In order to achieve this object, the present invention generates an adjustment control signal that evolves in response to changes in the m1 value of the monitoring area based on a range redundancy bar number representing the range of the set monitoring area. , The dynamic range of the output signal of the hold device is controlled to a sudden value by this single control No. 4g.

〔Example〕

The present invention will be described in detail below with reference to the drawings as an embodiment in which the present invention is applied to detect whether or not a product injection-molded in an injection molding machine has fallen from a mold. In FIG. 1, an injection molded product as a detected object of an injection molding machine 1 is molded by injecting molding material through a conduit 4 with a movable mold 2 in pressure contact with a fixed mold 3, and then molded by molding the movable mold 2. 2 is (2)
After moving back and away from the foot mold 3 along the guide 5, it falls below the injection molding machine 1. However, even though the movable side mold 2 was retracted and the product was supposed to go down the road, the product could not be completely lowered and the oJ work side mold 2
Assuming that the product is attached to the fixed mold 3, the product will be sandwiched between the molds 3 and 4 when the movable mold 2 moves forward toward the fixed mold 3 in the next cycle. There is a risk that types 2 and 3 may be damaged. An object detection device 6 is provided to prevent the risk of being bent.

The object detection device 6 includes a camera 7 and an object detection circuit 8. The camera 7 is placed near the mold 2 on the side of the injection number Jhiiso J, and captures the scene near the mold 2 at the timing when the mold 2 of the mold 1 on the fixed side has finished opening. The video signal VD is then sent to the object detection circuit 8.

Here, after injecting the molding material, the injection molding machine 1 opens the mold 2 and removes the product attached to the mold 2 by ejecting the ejector bottle provided in the mold 211j+. . The injection molding machine 1 is sequence-controlled by a sequencer (not shown), and therefore the sequencer sends command signals as necessary at timings such as when the mold starts to open, when it finishes opening, and when the ejector bottle ejects. It is done like this. In the case of this embodiment, when mold 2 has finished opening, the product is still in mold 21.
C (video signal VL captured while wearing C) can be taken into the beggar object detection circuit 8, and then #! The imaged video signal VDY can be taken into the object detection circuit 8 at the timing when the object passes through the protrusion.

Object detection circuit 8! As shown in Figure 2, the video camera 7
including horizontal and vertical synchronization signals sent from fx7
) It has 11 hold devices that receive the video signal VD of the standard television system, and also has a corresponding synchronization signal 5Y7a.
') A synchronization signal generator 12 is provided which receives the synchronization signal as a signal. The synchronization signal generator #12 is configured to generate a clock CL for synchronizing the operating camera 7 in the object detection circuit 8 in synchronization with the synchronization signal SY.

The hold device 11 stores a predetermined value of the screen formed by the video signal VDK as an analog value of the luminance value of a unit cell in the 2nd place if, for example, and in this embodiment, it is used for monitoring. If the areas A1 and A2 are expressed by taking the X coordinate in the H direction and taking the y coordinate in the V direction as shown in FIG.
+m, yl), A', (X11 yl +11
) point (X □ 10m, y □ 10n) Surrounded by 4 points (X □ 10m, y □ 10n) The surveillance area A2 is A (X2 * y2) *
k (X2+nl r y2) point (X2 r y2+
n ) A, (x2+m, y2+n), which is a range surrounded by 4A.

As shown in FIG. 4, the Hall and # recorder 11 receives first and #! 2 analog integration circuits 16A and 16B Y shoulder. The first analog integration circuit 16A converts the incoming bidet No. 18 (vl) through an analog switch 18k to a voltage and current conversion circuit 19A.
After converting it into a t current, it is applied to an integrating capacitor 2OA. In this way, the analog integral value stored in the capacitor 20A and the friend buffer circuit 21AyIl' are
It is sent out as a hold signal S2A.

Further, the hold voltage of the capacitor 2OA is cleared by a clearing analog switch 22AYd connected in parallel. On the other hand, #3 and #2 analog axis circuits 16B similarly receive the incoming video signal VDY through the analog switch 18BY for holding the voltage -#
r conversion circuit 19B After converting into current at vc, hold the tank capacitor 20BKi, and then
' Value Y follows the buffer circuit 21B and sends it out as a hold signal 82B. In this case as well, capacitor 2LIB
[, A clearing analog switch 22B is connected to the M column. Analog switches 18AA and 18B1 for holding the analog integration circuits 16A and 16B; analog switches 22A and zzB for clearing 22A and zz B
I, Clear I No. 6 830 controls on.

In other words, as shown in FIG. 5, the timing generator 25 generates the start time to the vertical direction M1B No. V (FIG. 5(A)).
Among the scanning lines of the first and second scans H that start based on , the scanning line that crosses the areas A1 and A2 is captured at the timing corresponding to the monitoring areas A1 and A2. Occur. In the case of the embodiment shown in FIG. 3, the area A1 is from the line of the y1th scan H (FIG. 5 (Byl)) to the line of the (y□+n)th scan (FIG. 5 (is < 3
'1 + n) It can only be started for a certain amount of time. Also, regarding area A2, from the 11th line I to the y2+11th line (Fig. 5 (By2) to (
B(y+n)))) When each of the horizontal synchronizing signals Hy2 to H(y2+n) rises for the line up to B(y+n)), a timing corresponding to the seat position x2 of area A2 has elapsed from the rising point of the horizontal synchronizing signal Hy2 to H(y2+n). l''B1 is raised by a distance #iIt m in the X-axis direction of area A2.

Thus, in FIG. 3, the analog switches 18A and 18B are turned on at the timing when the scanning line scans the areas A1 and A2 for one field of video signal, respectively, so that the video signal corresponding to the area of tI114 area A] and A2 is turned on. The capacitors 21JA and 20BKM are bolded for each corresponding line. In this way, the analog integrated values held in the analog integration circuits 16A and 16B are cleared by the clear signal 83C sent from the timing generation superposition 5 at the timing of the vertical synchronization No. 18V that arrives at the start of each field. 22B'2 is cleared by turning on, thereby obtaining an analog switch for the video signal portion corresponding to areas AI and A2 for each field.

In this way, hold 4! i: The analog integrated output signal 4 made up of the hold signals S2A and S2B at position 11 is converted from analog to digital by the sampling clock signal 85 sent from the timing generator δ using the field section Y that continues between the fields where the hold operation sound occurred. The data is converted into digital data in the device, and this is provided as measurement result data to the base value meter unit fl127 and the comparison/judgment unit.

Is the reference value calculation device 27 & private analog-to-digital conversion device # obtained from? Based on the redundant data 86, it is determined whether or not there is a product remaining between the side mold 2 and fixed side mold 3 in the injection molding machine I.
This method calculates the judgment reference value data so that a condolence decision can be made based on the fixed result data, and for example, the configuration shown in FIG. 6 can be applied. The reference value calculation device 27 processes the measurement result data sent from the conversion device based on the timing control signal S8 given from the timing generation device 6. In other words, the measurement result data S6 are connected in cascade with each other. For example, the memories Ml and A11 are
2...Mk, the first stage memory MIK is given, and the Oki 1 constant result data 86 that arrives in each cycle when the injection molding machine 1 molds one product one by one is sequentially stored in the memory M.
J, N2...Mk. The memory contents of memories M1 to Mk are stored in adder ADZ.
given it.

The increase result data S9 is given to the divider 32 as an output of the observation data memory 31.

A constant signal 810 corresponding to the number of addition data k of the observation data memo IJ 31 is given to the divider 32 from the constant setter 33, and thus the data 89 is output from the divider 32.
A simple average output S11 obtained by dividing by 10 is sent out. This average value data S11 is the upper limit value circuit 3 having a multiplier configuration.
3 and the lower limit value circuit 34, and the constants 812 and 813 given from the constant setters A and 36, respectively.
An upper limit reference signal 814 and a lower limit reference signal 515Y obtained by multiplying . Here, 1: The content of the constant signal 812 given to the limit value circuit 33 is set to rl, (rh>1), and the content of the running number setting signal 813 given to the lower limit value circuit 33 is set to rt(rt< 1) K is set.

In this way, the upper limit value reference signal S14, which is larger than the average value of the past measurement result data, is sent from the upper limit value circuit 33, and the lower limit value reference signal S14, which is smaller than the average value of the past measurement data data, is sent from the lower limit value circuit 34. S15 is sent.

These reference signals 814 and 815 are given as reference signals to the soft-movement device 4 and compared with the distance measurement result data S6 sent from the conversion device 26, and 61! When the fixed result data S6 is smaller than the upper limit reference signal S14 and larger than the lower limit reference signal S15, the product falls normally from the injection failure machine 1 and there is no object between T+J moving side mold side mold 2 fixed side mold 3. An object detection output signal S indicating that there is no object will be sent out.

In contrast, the measurement result data S6 or the upper limit reference signal 81
If it is larger than 4, it is neglected that the brightness between = Jyg + side mold 2 and hard > 1 side mold 3 is brighter than the state in which the product was dropped, and this indicates that the product, quality, or quality 1- (when its outer surface is bright). On the other hand, the measurement result data 6 is the lower limit reference signal 8.
If it is smaller than 15, the brightness between the movable side mold 2 and the fixed side mold 3 is lower than when there is no product.In other words, there is a product (the outer surface of this ratio product is quite bright) ) represents that. (Injection molding machine 1
It is possible to obtain an object detection signal 820 indicating whether or not the product is between the molds 2 and 3 at the timing when the mold is opened and the product is to be dropped by the protruding pin.

Here, the reference value 1 calculation device 27 is 8I! 6. As shown in Figure 6, a reference value d plus circuit 2 is provided for each monitoring area AI and A2.
7A and 27B7 south, each reference value N1 koji circuit 27A and 27B is similarly configured as described above, thus detecting the presence of an object in each monitoring area AI and A2 and providing reference signals 514A and 814B%, respectively. 815A and 815B are formed, which are sent as the reference (g numbers 814 and 815) of the reference value 11 calculating device n.

In the above configuration, the injection molding machine 1 opens the movable side mold 2 relative to the fixed side mold 3 after completing the molding 7 for one product, and the product is transferred to the projecting pin at 7°C at the timing t0. When the detection command signal S] from the sequencer of the injection molding machine 1 arrives at the timing generator B as shown in FIG. CLK based on his first vertical sync signal V as shown in Figure 7(6).
When t2 arrives, a data acquisition signal D'rxN (FIG. 70) corresponding to the following one field section is formed, and the first and second signals of the hold device 11 are Clearing switch 2 for the analog integration circuits 16A and 1fiB (Figure 4)
2A and 22 B'r turn on and capacitor A
and 2f) H, thus clearing the hold voltages S2A and 52B (Fig. 7 (C1) and (C2
)) Clear to w-4 black level.

After that, the timing generator 625 outputs the data acquisition signal DT.
Data acquisition No. 16 'l'' AI and TBI (Fig. 5) corresponding to monitoring areas A1 and A2 (Fig. 3) between
Figures (El) and (g2)) Analog phase division INr 16 A and tt;
(Figure m4) The capacitors 2OA and alB are used to hold the sampling video signal No. 6 through the analog switches 18A and 18BY. Thus, the hold signal S2A of the first and second analog integrating circuits 16A and 16B
and 82B are shown in Figure 7 (C1) and (C2) VC 1""
As such, once the opening point t2 has been cleared to the black level, it will rise each time the intake No. 11 TAI and TBI (Fig. 147 (El) and (E2)) are given.

Here, if the injection molding machine 1 is operating normally and the product is correctly dropped by the ejecting bin, the bold (no. Since the level is intermediate between the reference signal 814 and the lower limit reference signal S15, the comparison/determination device 2
8 means an object or a fish 2 1 - Object detection signal 8 will be sent out. On the other hand, even though injection 1 and fuhiiso 1 operate the protruding bottle, the product or movable side mold If the bath does not rise from 2, the video signal when the capture signals '01 and TBl (Fig. 8 (El) and (E2)) are given as shown in Fig. 8g8 corresponding to Fig. 7. The value of Vi) is such that the level of the video signal v1) is high because the surface of the product is quite bright. Therefore, the level of the hold signals 82A and 82B sent out from the first and second analog integration circuits 10A and 16B (FIG. 45) of the hold device 11 is equal to the reference value H [the upper limit reference 1d obtained in the calculation device 27]. No. 81
4 (Figure 8 (CI) and (C2)).

Therefore, at this time, the comparison/judgment device sends out an object detection signal S which indicates that there is an object.

In addition, in the above case, the brightness of the surface of the product is considered to be bright, or conversely, when the surface of the product is darker than when there is no product (for example, when the surface of the product is black), Figure 8 The level of the hold signals S2A and 82B shown in (CI') and (C2) is low at the other end (and the lower limit value reference No. 48 S
It will be lower than 15. In this case as well, the comparison/judgment device will detect an object (No. 18 SΔ) indicating that the product has not left the injection molding pattern.

By the way, this object detection operation is performed by injection JINX machine 1.
After that, the iJ dynamic motion mold 2 is closed and repeated every time the injection molding machine 1 produces a product by a command signal 81 that is sent from the sequencer each time one product is produced. Ill reply-
Therefore, the foot measurement result data S26 sent from the changing device 26 for each cycle is given to the reference 111 calculation device γ in the 11111st order, and at this time the reference value meter
27 is a memo 1 of calculation circuits 27A and 27B. IMI,
IV12, IV13, . . . The data that sequentially arrives in Mk is shifted each time it arrives and is updated and recorded while fz. Therefore, the magnitude of the video signal when the product falls in the past injection molding cycle is stored in the reference subdivision 3# device 27, and based on this data, the upper limit reference 1d814
and lower limit reference signal 815.

This means, for example, that the injection I molding machine IVc by the camera 7
For example, if the imaging conditions for the first pair change during the process, such as deterioration of the light source, temperature 1? If the level of the video signal v1) drifts due to characteristics, etc., the effect will appear as a change in the level of the constant result data S6 and a fluctuation in the signal level at the input terminal of the comparison/judgment device. Reference value signal 8 of the reference value meter chest device 27
14 and 815σ] levels also have the same tendency, so the comparative judgment 5t28 1'
By canceling the gaI component in the constant motion of 41, the determination motion by the object detection 4g, 52iJ can be made into a female character.

As described above, according to the configuration shown in FIG. 2, predetermined monitoring areas AI and A on the first side of the song are
Regarding 2, it is possible to detect the inconsistency of an object 1~,
In this way, even if video signal drift occurs due to fluctuations in imaging conditions, it is possible to obtain a 4'11 result that is not affected by the drift.

In addition to the above configuration, the object detection circuit 8 includes a monitoring checkerboard adjustment circuit 41 as shown in FIG. σ) The monitoring area adjustment circuit 41 allows the areas of the monitoring areas A1 and A2 (Fig. 3) to be arbitrarily selected as necessary, and no matter which value the area size is selected, the analog Axis output signal S
Components 1 for processing 1", that is, analog-digital S' (W system [26, 1-1], are used so as not to fluctuate the dynamic range of the reference value rise control device 27 and the Hiei pressure control device 28.

The monitoring surface leg adjustment circuit 41 is configured such that the operator can manually set the horizontal length m and vertical length n of the monitoring areas Al and A2 in the range setting circuit 42#L, and the set outputs are 8m and 8n. It is given to Kakudono 8 circuit 43.

The multiplier circuit 43 multiplies the set output 8 and S, and supplies the area signal S□□ corresponding to the surfaces At'',' (=+n×n) of the monitoring areas A1 and A2 to the divider circuit 44.

Ru.

The divider circuit 44 receives a 2-pin number signal 8° with a range integer constant C from the 1P leg setting circuit 45 and outputs a key number signal S. If the surface phase (No. 8 8□. No. S4], i-range control circuit 46
give to

The range control circuit 46 controls the dynamic range illumination signal 841 of the analog integral output signal 84 given from the hold device 11 to the analog-to-digital converter.
For example, the configuration shown in FIG. 9 can be applied. In FIG. 9, reference numeral 51 denotes a multiplier circuit configured as an operational amplifier, and the multiplier for the analog output signal 84 that arrives as a subtractive power is controlled by the adjustment control No. 100 S41 in the multiplier switching circuit 52. Here, the multiplier switching circuit 52 is configured by connecting switches H1 to H4 to the white row of resistors R1 to RdK connected to the output terminal of the multiplier circuit 51, and is configured by connecting the switches H1 to H4 to the white row of resistors R1 to RdK connected to the output terminal of the multiplier circuit 51, and converting the adjusted price by 1 times the number 541 (for example, by the 4-bit digital 1g number). By selectively closing the switch 11-H4 according to the selected switch, the resistor connected to the selected switch is grounded. In this way, the resistors ROY and 1ff connected to the resistors R1 to R41C (the 1st gear signal fed back to the input terminal of the multiplier circuit 510; AV control signal 4
1, a timing adjustment signal 843 is also applied to the next output value 842 sent from the output end of the honor circuit 51. This timing adjustment signal 843 corresponds to the area (=mXn)K set in the range setting circuit 42 VC, and also corresponds to the acquisition signals TAI and TBI
In addition to adjusting the pulse width and center Ib position of Figure h5), specify the set input signal to be generated for this acquisition signal TAI and TA2Y, and thus adjust the center of the newly set monitoring station j#AI and A2. 4'11' 4ts4w holding device 11 with a size corresponding to the position and area
to be sent from.

In the above monitoring area IIA adjustment circuit 41, the range setting circuit 42 determines the horizontal length m of the monitoring areas A1 and A2.
and one or both of the vertical length n 6f Toshifumi '1-
Then, in response to the timing adjustment signal, the timing generator δ sends out an acquisition signal SaI to the hold device 11 at a timing corresponding to the position and area of the newly set monitoring areas A and A2. Here, since the rising width or the number of lines of 4g No. 1'A1 and '1'B1 (Fig. 5) that constitute the acquisition signal 831 increases or decreases depending on the area of the monitoring areas A1 and A2, the capacitor of the hold device 11 The charging time for 2OA and 20B increases or decreases depending on the increase or decrease in area. Therefore, the value of the hold voltage stored in capacitors λ)A and 20B, and thus the value of the integrated output signal S4, increases or decreases in proportion to the planes & of the monitoring areas A1 and A2.

On the other hand, the multiplier that is sent from the monitoring area adjustment circuit 41 and is to be multiplied by the integral output signal S4 in the range control circuit 46 increases or decreases in inverse proportion to the change in the area of the monitoring areas A1 and A2. Therefore, the range control circuit 46
The dynamic range of No. 842 in the output 4 of is the monitoring area A.
Even if the tans of 1 and A2 are increased or decreased, it does not respond to this,
Hold at a constant value.

Therefore, if the dynamic range of the processing circuit in the subsequent stage for processing the output signal 84 of the hold device 11 is once adjusted to the optimum value, then the monitoring areas A1 and A can be adjusted as necessary.
Even if the area Z of No. 2 is changed in length, the proper condition can be maintained reliably, and therefore the object detection operation can always be performed with high precision without requiring any complicated effort.

FIG. 10 shows another embodiment 2 of the range control circuit 46, in which the output signal 84 of the hold device 11 is received by the multiplication type digital-to-analog converter circuit 55, and the output signal 84 of the range control circuit 46 is converted into, for example, an 8-hit digital No. 46 format signal. The dynamic range 7al of the output signal 842 can be adjusted by the output signal 841. Even in this case, the same effect as in the above case can be obtained.

In addition, in the above description, the range control circuit 4 is at a loss.

At the same time, the monitoring area adjustment circuit 41 obtains a control signal 841 that is inversely proportional to the change in area, so that the input to the range control circuit 460 that is proportional to the change in area is canceled out by the adjustment control signal 841. However, the calculation of the range control circuit 46 is not limited to Sakae 1-, but also includes
g Use of glazed objects such as performance instruments.

In short, the monitoring area adjustment circuit 41 forms an adjustment control signal 841 that changes in response to changes in m1, and the range control circuit 46 generates an adjustment control signal 841 that changes in response to changes in -p+. It is better to cancel the range change adjustment control signal 841.

Furthermore, in the above-described embodiment, the present invention detects whether or not the product falls when the mold is opened in the injection molding machine.
This is an example in which the sound of an object placed on a belt conveyor is detected and the intrusion of mud into the space is detected ``f'
It can also be widely applied to 1FIH criminal devices such as

Furthermore, in the above, range control IgIk! i't 4
6 The car described above is installed on the output side of the Y hold device 11, and the above-mentioned he
You can get Y 1 giant 1-like effect.

〔Effect of the invention〕

As described above, according to the present invention, on the screen σ-) supervisor 4M, 1
When the area of the lil region changes, the change that occurs in the dynamic range of the hold device (σ)
By eliminating the noise using the 1l i+ circuit,
Even if you change the monitoring surface axis, it is complicated! An object detection device that does not require IV work can be easily obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the extension box 1 of the object detection device according to the present invention; Fig. 2 is a block diagram showing the detailed configuration of the object detection circuit (σ); ) For explanation 1
- Fig. 4 is a detailed configuration diagram of the hold device 11 in Fig. 2, and Fig. 5 is a connection diagram showing the detailed structure of the hold device 11 in Fig. 2; Each issue'1 is a signal waveform diagram, a block diagram showing the specific configuration of the reference value calculation device 27 in Figure 61 and Figure 92, and Figures 7 and 8 are each part of Figure 2.) Signal number diagram showing the signal,
FIG. 9 is a connection diagram showing the detailed configuration of the microwave oven section lj part 11 circuit shown in FIG. ■...Injection molding machine, 2, 3...Movable side, fixed side mold,
7... Video camera, 8... Object detection circuit, 11.
... Monthly field device, 12... Synchronization signal generator, 5
. . . Timing generator, 26 .
2...Range setting circuit, 46...Range control circuit. Agent 1) Megumi Hebe 43 Figure 4 Figure μ Figure 5 Figure 0 1; (B(I/2+fl+f)) H(ff2+71 +/
) Condolence 7 Figure tt i2 6th rule, 7,2 CH2) i TB/”°゛: 49 Solid

Claims (1)

[Claims] The image obtained by the video signal sent from the video camera that images the three-dimensional space of PJr's feet. Ji! At the timing corresponding to the area, take the upper u1:bite 4th number into the hold device and hold it, and check the level of the output signal of this hold device! + (Compared to quasi-1 direct, in an object detection device that responds to the presence or absence of an object, if+: 'j
Indicates the range of the J2 viewing area (1 - range setting number) 1. (Reverse increase in response to changes in the face of the semi-selected monitoring area.+
7. Monitoring I + i phase tone adjustment circuit that occurs as follows: Adjustment control No. 11 receives and controls the dynamic range of the output (+4') f of the hold device piece 1" Range control fjll141 An object detection device having a t% characteristic comprising: