JPH0660941B2 - Object detection device - Google Patents

Description

The present invention relates to an object detection device, and is particularly suitable for application when monitoring changes in an object to be detected using a video signal.

Conventionally, as this type of object detection device, the appearance of an object to be detected is converted into a video signal by an imaging device, the video signal is displayed on a cathode ray tube, and a brightness sensor is attached on the display surface of the cathode ray tube. Thus, it is considered that the presence or absence of an object is confirmed by utilizing the fact that the brightness on the cathode ray tube changes depending on the presence or absence of the object.

However, according to the method of detecting the brightness on the cathode ray tube as described above, the brightness sensor for detecting the brightness on the display surface is cumbersome to attach on the display surface according to the position of the monitored object to be monitored. However, there is a problem that there is a certain limit to downsizing the overall structure because a relatively large cathode ray tube must be prepared, and further, the mounting state of the brightness sensor on the display surface. Therefore, external light may be mixed into the sensor and noise may be included in the luminance detection result.

The present invention has been made in consideration of the above points, and based on the image signal obtained by the image pickup apparatus, the positional information indicating the presence or absence of an object can be obtained from a predetermined area on the screen with a simple configuration. The object of the present invention is to propose an object detection device that can be obtained.

As means for solving such a problem, the present invention is based on a video signal VD obtained by picking up an image of an object to be detected by the video camera section 7, and detecting section (11, 12, 25, 26).
In the above, the integrated information S2A, S2B is obtained from the plurality of monitor areas A1, A2 on the screen formed by the video signal VD, and the monitor sections A1, A are obtained in the judging section (27, 28).
The two pieces of integration information S2A and S2B are respectively the reference signal S1.
4, in the object detection device that determines that a change has occurred in each of the monitoring area portions of the detected object when S15 is exceeded, the detection unit (11, 12, 25, 26) includes a plurality of monitoring areas A
1. Integrating means 16A and 16B provided for A1 and A2
And x position detecting means 48 and y position detecting means 43 for detecting the scanning position in the x direction and the scanning position in the y direction based on the video signal VD, and the setting position information on the screen for each of the monitoring areas A1 and A2. When the scanning position of the video signal VD matches the set position information on the basis of the detection outputs of the x-position detecting unit 48 and the y-position detecting unit 43, the integration unit designation information is stored, and the matching state is set. The monitoring position designation memory means 42, 44 for reading the set position information and the integration means designation information, and the corresponding integration means 16A, 16B of the integration means 16A, 16B based on the read set position information and the integration means designation information. By selectively designating for a predetermined time, the integrating means 16 that has been selectively designated.
A and 16B are provided with selection designating means (45, 46, 47, 49, 50) for taking in the video signal VD, and the integrated outputs of the integrating means 16A, 16B are integrated information S2A, S2B.
Is sent to the determination unit (27, 28).

According to such a configuration of the present invention, the x position detecting means 48
And the position on the screen currently being scanned is detected by the y position detecting means 43, and when the detected position reaches the set position stored in the monitoring position designation memory means 42, 44, a plurality of integrating means 16A , 16B, the corresponding integrating means 16A, 16B are selected to integrate the video signal VD.

Hereinafter, the drawings will be described in detail as an embodiment in which the object detection device according to the present invention is applied to a monitoring device of an injection molding machine.

In FIG. 1, an injection-molded product which is an object to be monitored of the injection molding machine 1 has a molding material through a conduit 4 in a state where a movable side mold 2 is in pressure contact with a fixed side mold 3 (this working process is called a mold clamping process). After being molded by injection, the movable side mold 2 is in a state of being retracted and separated from the fixed side mold 3 along the guide 5 (this working process is referred to as a mold opening process), and then the movable side mold 2 By projecting a pin (not shown) from the rear side (this working process is referred to as a projecting process), a basic working process of dropping the injection-molded product below the injection molding machine 1 is included. ing.

However, when the movable side mold 2 retreats and is in the mold open state in this way, the product should not be dropped but is stuck to the movable side mold 2 or the fixed side mold 3 without being dropped. In this case, in the next injection molding cycle, when the movable side mold 2 is pressed forward toward the fixed side mold 3 to be in the mold clamped state, the product is clamped between the molds 2 and 3 so that the product is clamped between the molds 2 and 3. May be damaged. A monitoring device 6 is provided to prevent such a risk.

The monitoring device 6 is composed of a video camera 7 and an object detection circuit 8. The video camera 7 is arranged at a position near the movable side mold 2 on the side of the injection molding machine 1, and images the scene of the mold 2 and its vicinity at the timing when the movable side mold 2 has finished opening from the fixed side mold 3. Object detection circuit 8 for video signal VD
Send to.

Here, the injection molding machine 1 opens the mold 2 after injecting the molding material, and projects the product adhering to the mold 2 by projecting a projecting pin provided on the mold 2 side. . The injection molding machine 1 is sequence-controlled by a sequencer (not shown). Therefore, the sequencer may output a command signal S1 at the timing of starting opening of the mold, the timing of ending opening of the mold, the timing of the projecting operation of the projecting pin, etc. It is designed to send out.

In this embodiment, the product is still attached to the mold 2 at the timing when the mold 2 has finished opening (that is, after the mold opening process,
The video signal VD imaged in the state before the projecting step) can be taken into the object detection circuit 8, and then the video signal VD imaged at the timing when the product is projected by the projecting pin (that is, the state after the projecting step). It can be taken into the object detection circuit 8.

The object detection circuit 8 is, as shown in FIG.
It has a hold device 11 for receiving a video signal VD of a standard television system including horizontal and vertical sync signals sent from the device, and a sync signal generator 12 for receiving the sync signal SY as a trigger signal. The synchronization signal generator 12 outputs the clock signal CL for synchronizing the operation in the object detection circuit 8 with the video camera 7 to the synchronization signal SY.
It is designed to occur in sync with.

The hold device 11 stores, as an analog integrated value, a luminance signal of a unit area at positions of a plurality of predetermined points in the image information formed by the video signal VD, and the monitoring areas A1, A2 ... As shown in the figure, if the x coordinate is taken in the H direction and the y coordinate is taken in the V direction, the point (x
₁ , y ₁ ), a point (x ₁ + m, y ₁ ), a point (x ₁ , y ₁ +)
n) and a point (x ₁ + m, y ₁ + n), which is surrounded by four points, and the monitoring area A2 is a point (x ₂ , y ₂ ), a point (x ₂ +
m, y ₂ ), point (x ₂ , y ₂ + n), point (x ₂ + m, y
_It is the area surrounded by 4 points ( ₂ + n), and so on.

As shown in FIG. 4, the hold device 11 has a video signal V
Areas A1, A2, which receive D through the buffer circuit 15 ...
The analog integration circuits 16A, 16B, ... Corresponding to. The analog integrator circuit 16A receives the incoming video signal V
After converting D into a current in the voltage-current conversion circuit 19A through the analog switch 18A, the integration capacitor 20
Give to A. Thus, the analog integrated value stored in the capacitor 20A is sent out as the hold signal S2A through the buffer circuit 21A. Moreover, the hold voltage of the capacitor 20A is cleared through a clearing analog switch 22A connected in parallel.

On the other hand, the analog integrator circuit 16B similarly converts the incoming video signal VD into a current in the voltage / current converter circuit 19B through the hold analog switch 18B, and then integrates and holds it in the integrating capacitor 20B, and the hold value is held in the buffer circuit 21B. Through hold signal S2
Send as B. Also in this case, the clear analog switch 22B is connected in parallel with the capacitor 20B.

The analog integrator circuits 16A, 16B ... Hold analog switches 18A, 18B ..., and clear analog switches 22A, 22B ... Are respectively taken-in signals S3I generated by the timing generator 25 (FIG. 2).
The on signal is controlled by the clear signal S3C.

That is, as shown in FIG. 5, the timing generator 25 selects one of the first, second, ..., Scanning lines which starts with reference to the start time t ₀ of the vertical synchronizing signal V (FIG. 5 (A)). The capture signal S3I is generated at the timing corresponding to the monitoring areas A1, A2, ... For the scanning lines that cross the monitoring areas A1, A2. In the case of the embodiment of FIG. 3, the monitoring area A1 is from the y ₁ -th line (FIG. 5 (By ₁ )) to the (y ₁ + n) -th line (FIG. 5 (B (y ₁ +)).
n))) up to the horizontal synchronization signals Hy _{1 to} H
When the time corresponding to the coordinate x ₁ in the x-axis direction has elapsed from the start of (y ₁ + n), the acquisition timing signal TA1
Is started for a time corresponding to the distance m in the x-axis direction of the monitoring area A1. Further, regarding the monitoring area A2, from the y ₂ -th line to the y ₂ + n-th line (FIG. 5 (By ₂ )-
(B (y + n))) from the rising edge of each horizontal synchronizing signal Hy _{2 to} H (y ₂ + n) to the monitoring area A
When the timing corresponding to the coordinate x ₂ of ₂ has elapsed, the capture timing signal T for the analog switch 18B
B1 is started up for a time corresponding to a distance m in the x-axis direction of the monitoring area A2.

Thus, in FIG. 3, the analog switches 18A and 18B are respectively arranged at the timing when the scanning lines scan the monitor areas A1, A2, ... For the video signal for one field.
...... is turned on, the monitoring areas A1, A2 ...
The integrated value of the video signal corresponding to the light energy of ... Is held in the capacitors 20A, 20B.

The analog integrated value held in the analog integrator circuits 16A, 16B ... Is the clear signal S3C sent from the timing generator 25 at the timing of the vertical synchronizing signal V that arrives at the start of each field, and the clear analog switches 22A, 22B ... It is cleared by turning on ..., and the monitoring area A
An analog integrated amount representing the optical energy of the video signal corresponding to 1, A2 ... Is obtained.

In this way, the hold signal S2 of the hold device 11 is
The analog integrated output signal S4 consisting of A, S2B, ... Is digital in the analog digital conversion device 26 by the sampling clock signal S5 sent from the timing generation device 25 using the field section following the field section in which the hold operation is performed. It is converted into data, and this is given to the reference value calculation device 27 and the comparison determination device 28 as measurement result data.

Based on the measurement result data S6 currently obtained from the analog digital conversion device 26, the reference value calculation device 27 determines whether or not the product remains between the movable side mold 2 and the fixed side mold 3 in the injection molding machine 1. This judgment reference value data is calculated so that it can be judged based on the measurement result data, and as shown in FIG. 6, it has reference value calculation circuits 27A, 27B ... Corresponding to the monitoring areas A1, A2. .

That is, the reference value calculation circuit 27A processes the measurement result data S6 sent from the analog digital conversion device 26 based on the timing control signal S8 supplied from the timing generation device 25. That is, the measurement result data S6 is given to the first-stage memory M1 among a plurality of, for example, k-stage memories M1, M2, ... Mk that are connected in cascade, and each injection molding cycle in which the injection molding machine 1 molds one product at a time. The measurement result data S6 arriving at is stored in the memories M1, M2 ... Mk while being sequentially shifted. As a result, in the memories M1 to Mk,
The k pieces of measurement result data S6 detected in the past k injection molding cycles are stored. These memories M1 to M
The measurement result data stored in k is given to the adder AD1, and the addition result data S9 is given to the divider 32 as the output of the observation data memory 31.

In the divider 32, the number of added data k in the observation data memory 31
Is supplied from the constant setter 30. Thus, the calculator 32 converts the data S9 into the data S10.
Average value data S11 representing a simple average value obtained by dividing by
Is sent. This average value data S11 is given to the upper limit value circuit 33 and the lower limit value circuit 34 of the multiplier configuration, and the constant signal S1 given from the constant setters 35 and 36, respectively.
An upper limit value reference signal S14 and a lower limit value reference signal S15 obtained by multiplying 2 and S13 are transmitted. Here, the upper limit circuit 3
The content of the constant signal S12 given to 3 is r _H (r _H >
In addition to being set to 1), the content of the constant setting signal S13 given to the lower limit circuit 34 is set to r _L (r _L <1). Thus, the upper limit circuit 33 sends the upper limit reference signal S14 larger than the average value of the past k measurement result data and the lower limit circuit 34 sends the lower limit reference signal S15 smaller than the average value of the past k measurement data. To be done.

These reference signals S14 and S15 are used by the comparison / determination device 28.
(FIG. 2) is compared with the measurement result data S6 sent from the analog digital conversion device 26 as a reference signal, and the measurement result data S6 is the upper limit reference signal S14.
When the value is smaller and larger than the lower limit reference signal S15, the product normally drops from the injection molding machine 1 and there is no object between the movable side mold 2 and the fixed side mold 3 and the object detection signal S2.
0 will be sent.

On the other hand, the measurement result data S6 is the upper limit reference signal S1.
If it is larger than 4, it means that the brightness between the movable side mold 2 and the fixed side mold 3 is brighter than that when the product is dropped, which means that the product is present (the outer surface of which is considerably bright). If it is). On the other hand, when the measurement result data S6 is smaller than the lower limit reference signal S15, the brightness between the movable side mold 2 and the fixed side mold 3 is darker than when there is no product. In other words, there is a product. (In this case the outer surface of the product is rather dark). Thus, at the timing when the injection molding machine 1 opens the mold, that is, after the mold opening process, at the timing of starting the projecting process for dropping the product by the projecting pin,
An object detection signal S20 can be obtained which represents whether the product is between molds 2 and 3.

The reference value calculation circuit 27B has the same configuration as the reference value calculation circuit 27A.

Thus, the presence or absence of an object is detected for each of the monitoring areas A1, A2 ... And the reference signals S14A, S14B ...
, S15A, S15B ... Are formed and sent as reference signals S14, S15.

In the above configuration, the injection molding machine 1 finishes molding one product, and the movable side mold 2 is moved to the fixed side mold 3 in the mold opening process.
After opening with respect to the seventh step, at the timing of the time point t ₁ after the product is pushed down by the projecting pin in the projecting step,
As shown in FIG. 3A, when the detection command signal S1 arrives at the timing generator 25 from the sequencer of the injection molding machine 1 (FIG. 2), the timing generator 25 sends a clock from the synchronization signal generator 12. based on the signal CL, Figure 7 (B), the data acquisition signal subsequent first vertical synchronizing signal V is equivalent to one field interval following the point t ₂ arriving DT _iN (FIG. 7 ( D))
And a clear signal S3 formed by its rising
An analog integration circuit 16 of the hold device 11 using C
A, 16B ... (Fig. 4) clear switch 22A,
22B ... by turning on the capacitors 20A and 20B
The hold voltage of ... is cleared, and thus the hold signals S2A, S2B ... (Fig. 7 (C1), (C2) ...)
Is once cleared to the black level.

After that, the timing generator 25 receives the data acquisition signal DT _IN
Monitoring areas A1, A2, ... Between the sections shown in FIG. 7 (D).
Data capture signals TA1, TB1 ...
((E1), (E2) in FIG. 7) are generated, and in response to this, the hold signal S3I is held.
To the analog integrator circuits 16A, 16B ...
.. (FIG. 4) through analog switches 18A, 18B ..... The capacitors 20A, 20B .. Thus, the hold signals S2A, S2B of the analog integrator circuits 16A, 16B ...
Is FIG. 7 (C1), as shown in (C2) ......, is once cleared to black level at time _{t 2,} the accepting signal TA1, TB1 ...... (FIG. 7 (E1), (E2 ) ……)
Will increase each time is given.

If the injection molding machine 1 operates normally and the product is properly dropped by the protruding pin, the hold signals S2A, S2
The level of 2B ... is the reference value calculation circuit 27A, 27B ...
Since the level becomes an intermediate level between the upper limit value reference signal S14 and the lower limit value reference signal S15 obtained in FIG. 6, the comparison / determination device 28 indicates the object detection signal S indicating that there is no object.
20 (FIG. 2) will be transmitted.

On the other hand, when the injection molding machine 1 operates the protruding pin and the product does not fall from the movable mold 2, as shown in FIG. 8 corresponding to FIG. Input signals TA1, TB1 ... (FIG. 8 (E1), (E2) ...
...) is given, the value of the video signal VD becomes large because the surface of the product is quite bright. Therefore, the levels of the hold signals S2A, S2B, ... Sent from the analog integration circuits 16A, 16B ... (FIG. 4) of the hold device 11 are the reference value calculation circuit 27.
A, 27B ... Upper limit value reference signal S14
A, S14B ... becomes larger (Fig. 8 (C1),
(C2) ……). Therefore, at this time, the comparison / determination device 28 sends the object detection signal S20 indicating that there is an object.

In the above case, the case where the surface of the product is bright was described, but 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).
Shows the lower limit value reference signal S15 obtained by the reference value calculation device 27 when the levels of the hold signals S2A, S2B ... Shown in FIGS. 8 (C1), (C2).
Will be lower. Therefore, also in this case, the comparison / determination device 28 sends an object detection signal S20 indicating that the product has not dropped from the injection molding machine 1.

By the way, such an object detecting operation is sent from the sequencer every time one product is made in the subsequent injection molding cycle after the injection molding machine 1 closes the movable side mold 2 in the mold clamping process to end one injection molding cycle. In response to the command signal S1 coming in, the measurement result data S6 sent from the analog digital conversion device 26 for each cycle are sequentially given to the reference value calculating device 27, and at this time, the reference value calculating device 27 has the reference value calculating circuit 27A. , Memory 27B ...
1, M2, M3 ... Mk are sequentially updated and recorded while shifting the data for each arrival.
Figure). Therefore, the magnitude of the video signal at the time of dropping the product in the past k injection molding cycles is stored in the reference value calculation device 27, and the upper limit value reference signal S14 and the lower limit value reference signal S15 are calculated based on this data. become.

As a result, if the imaging condition of the injection molding machine 1 by the camera 7 changes in the middle, for example, if the level of the video signal VD drifts due to deterioration of the light source, temperature characteristics, or the like, the influence is exerted. The change in the level of the measurement result data S6 appears as a change in the signal level at the device input side end of the comparison / determination device 28. At this time, the levels of the reference value signals S14 and S15 of the reference value calculation device 27 have the same tendency. However, since it fluctuates, the fluctuation component is canceled in the judgment operation of the comparison and judgment device 28, so that the judgment operation by the object detection signal S20 can be stabilized.

As described above, according to the configuration of FIG. 2, predetermined monitor areas A1, A2, ... On the screen formed by the video signal VD.
For the injection molding machine 1, it is possible to reliably detect whether or not the injection-molded product remains in the movable side mold 2 at the timing when the projecting process is completed. It is possible to obtain a determination result that is not affected by the drift of the video signal VD based on.

In the case of this embodiment, the timing generator 25 (FIG. 2)
Includes a take-in signal generating circuit 41 having the structure shown in FIG. 9 for generating the take-in signal S3 (and accordingly the take-in signals TA1, TB1 ... In FIG. 5) to the hold device 11. In FIG. 9, the fetch signal generation circuit 41 has a monitoring position designation memory 42 of RAM configuration.
Data relating to the scanning positions of the monitoring areas A1, A2, ... As described above with reference to FIG. 3 is written in advance as a data signal DP from a main controller (not shown) through the writing circuit 40. For example, the first
As shown in FIGS. 0 and 11, the monitoring areas A1, A2, ... As described above with reference to FIG. 3, use a length of four scanning lines in the V direction and have five positions in the H direction. If the area of is monitored, the monitoring position designation memory 42
Is the x direction position data x corresponding to the line number data y _{1 to} y ₁ +3 for the monitoring area A1 as shown in FIG.
₁ and integrating circuit specifying data [16A] contains the data whose content and x-direction position data x ₂ and the integrator circuit designation data corresponding to the line number data y ₂ ~y _{2 +3} for monitoring area A2 [16B] Stores data with the contents of.

Each line number data _{y 1 ~y 1 + 3, y} 2 ~y 2 + 3 ...
Is assigned to a predetermined memory area of the memory 42, and by reading the address of the memory area, the x-direction position data and the integration circuit designation data corresponding to the line number data assigned thereto are read.

The count contents of the x counter 48 and the y counter 43 are given to the memory 42 through the address converter 44 as read signals in the monitoring position designation memory 42. The y-counter 43 counts the clock pulse CLH given in synchronization with the horizontal synchronizing signal H from the synchronizing signal generator 12 (FIG. 12), and thus the content of the y-counter 43 sequentially specifies the scanning line number of the video signal VD. I will go.

The x counter 48 is designed to sequentially specify the numbers of the monitoring points in the x direction.
The clock signal CLx having the same period as that of the horizontal synchronizing signal obtained from (FIG. 2) is divided by a predetermined number to count.

Its contents at the time of operation of the y-counter 43 is _{y 1} ~y 1
_{+ 3, y 2 ~y 2 +} 3 if the ..., because the corresponding line number data in the x-direction position data, and the integration circuit specified data is stored in the memory 42, which is the x and y position register 45, respectively, And the integration circuit designation register 46. The contents of the x- and y-direction position register 45 are given to the comparator 47 and are monitored to see if they match the contents of the x-counter 48 and the y-counter 43.

Thus, when a match is detected by the comparator 47, the match detection output PS is given as a trigger signal to the pulse generating circuit 49 having, for example, a monototo vibrator, so that a pulse having a predetermined pulse width is generated in the fetch signal generating circuit having a decoder. It is given to 50 as a load signal. The take-in signal generating circuit 50 converts the integrating circuit designating data stored in the integrating circuit designating register 46 into integrating engine designating signals SW1, SW2 ..., Which are the analog integrating circuits 16A, 16B ..... (FIG. 4). It is sent as an ON control signal to the analog switches 18A, 18B ....

According to the configuration of FIG. 9, the monitoring position designation memory 42 corresponds to the x-direction position data at the left end of the monitoring areas A1, A2 ... As is apparent from FIGS. 10, 11 and 12. If the video signal reaches a section corresponding to a scanning line that crosses the left end of the monitoring area A1 or A2, the contents of the x counter 48 and the y counter 43 at this time are stored. Correspondingly, the x and y direction position data and the integration circuit designation data of the monitoring position designation memory 42 are read to the x and y direction position register 45 and the product circuit designation register 46. At the same time, a count operation is performed so that the content of the x counter 48 for the scan line sequentially scans the scan line from the left side to the right side.

Eventually, when the contents of the x counter 48 and the y counter 43 become the same as the contents read in the x and y direction position register 45, this corresponds to the left end of the monitoring area A1, A2 ... Of the video signal VD. It means that the video signal of the part to be reached has arrived. At this time, comparator 4
Since 7 generates the coincidence output PS, the acquisition signal generation circuit 50 analogizes the acquisition specification signal corresponding to the contents of the integration circuit specification register 46 during the time corresponding to the pulse width of the pulse generated in the pulse generation circuit 49. Integrating circuit 16A,
It will be sent to 16B ....

Here, the pulse width of the pulse generation circuit 49 is the monitoring area A1,
Since the length corresponding to the length of A2 in the x direction is selected, the generation time of the acquisition signal output from the acquisition signal generation circuit 50 is exactly the same as the time for scanning the monitoring areas A1 and A2. Will be done.

Therefore, as described above with reference to FIGS. 7 and 8, the acquisition signals TA1, TB1 ... (FIG. 7 (E1), (E1), (E1), (E1), ...
2) ..., FIG. 8 (E1), (E2) ...) is obtained, and the analog integrator circuits 16A, 16 are thereby obtained.
The integrated value of the video signal corresponding to the monitoring areas A1, A2, ... is held as information indicating the light energy of the monitoring areas A1, A2 ,. The result can be obtained.

Thus, if the configuration as shown in FIG. 9 is adopted, a relatively simple configuration can be used for determining that the video signal VD corresponding to the monitoring area has arrived. By the way, as the data of the monitoring position designation memory 42, only the data about the start position of the monitoring area needs to be stored. Therefore, even if the number of monitoring areas becomes large, the storage capacity of the memory 42 does not have to be so large. good. Further, when the monitoring position is designated or the area of the monitoring area is changed, the monitoring position designation memory 4
It is only necessary to change the data stored in No. 2 and thus a highly versatile monitoring device for the injection molding machine can be realized.

In practice, in the case of this embodiment, the screen formed by the video signal VD is divided into eight in the x direction and six in the y direction as the monitoring areas A1, A2 ... As shown in FIG. 8 × 6 = 48 monitoring areas A11, A12 ... A6
8 and the positions of the respective monitoring areas A11, A12 ... A68 are coordinates (x ₁₁ , y ₁₁ ), (x ₁₂ , y ₁₁ ) ... in the upper left corner.
As can be represented by (x ₁₈ , y ₁₆ ), the monitoring areas A11, A12, ..., A68 are formed so as to be arranged adjacent to each other in a grid pattern.

As a result, in the monitoring position designation memory 42 of FIG. 9, as shown in FIG. 21 corresponding to FIG.
11, A12 ... Line number data (y
₁₁ , y ₁₁ +1, y ₁₁ +2, y ₁₁ +3), (y ₁₁ , y ₁₁ +
1, y ₁₁ +2, y ₁₁ +3) (y ₁₆ , y ₁₆ +1, y ₁₆
+2, y ₁₆ +3), and x-direction position data x ₁₁ , x ₁₂ ...
... x ₁₈ is stored in advance, and every time the count outputs of the y counter 43 and the x counter 48 are given to the address converter 44, the capture signal generation circuit 50 is sent from the monitoring position designation memory 42 via the integration circuit designation register 46. From the 68, the corresponding integrator circuits are selected and designated from the 68 integrator circuits provided for the monitor areas A11, A12, ... A pulse generation circuit 49 sends out an integration operation signal having a pulse width corresponding to the length of the monitoring areas A11, A12 ... A68 in the x direction via 47.

With this, the monitoring information can be easily obtained from the entire screen with a simple configuration.

In the above description, the case where a specific area is designated for monitoring the image screen has been described, but instead, as shown in FIG. 13, monitoring is performed for a predetermined length along the scanning line. You can In this case the first
In FIG. 2, for example, the x direction position data and the integration circuit designation data for only one line (a plurality of lines in FIG. 12) may be stored as the storage data for the monitoring region designation position. Even in this case, in the same manner as described above for the above monitoring area,
The determination result can be easily obtained by using the detection output indicating the light energy of the monitoring area. In this specification, the monitoring area includes the monitoring target along the scanning line as shown in FIG.

In the case of the embodiment shown in FIG. 2, the hold device 11 holds the video signal as an analog value, and after the hold signal is converted into a digital value by the analog digital conversion device 26, it is digitally objected by the comparison / determination device 28. However, instead of this, as shown in FIG. 14, the analog hold signal S4 obtained in the hold device 11 is directly given to the comparison / judgment device 28, and the comparison / judgment device 28 outputs the analog signal. The presence / absence of an object may be determined.

In this case, the output S4 of the hold device 11 is converted into a digital signal in the analog digital conversion device 71 and given to the reference value calculation device 27 as measurement result data,
Further, the reference value signal obtained as a result of the calculation in the reference value calculation device 27 is converted into an analog signal in the digital analog conversion device 72 and then given to the comparison / determination device 28. Even in this case, the same effect as described above with reference to FIG. 2 can be obtained.

Further, instead of the configuration of FIG. 2, as shown in FIG. 15, the holding device 11 may be changed to a configuration for holding digital data. That is, in this case, the camera 7
The video signal VD coming from the timing generator 25
The integration circuit 73 performs integration according to the area of the monitoring areas A1 and A2 (FIG. 3) according to the capture signal S3 of the analog signal, and then the integration result is converted into a digital signal by the analog digital conversion device 74 to convert it to a digital memory 75. To store. Thus, the measurement result data S6 in the digital signal format can be obtained from the hold device 11, and thus the measurement result data S6 can be directly applied to the reference value calculation device 27 and the comparison / determination device 28. Even if you do so, the second
The same effect as in the case of the figure can be obtained.

Further, instead of the configuration of the integrating circuit 73 in FIG. 15, it may be changed to the configuration of FIG. 16 in which it is digitally integrated. That is, in FIG. 16, the video signal VD coming from the camera 7 samples the instantaneous value corresponding to the position in the x direction on each line in the sample circuit 76 and converts it into a digital value in the analog digital converter 77, and then adds it 78. Give to. The adder 78 sequentially adds the instantaneous value data that arrives at each sample point in the monitoring area, and stores the addition result in the digital memory 79. In this way, the video data sampled over the entire area of the monitoring area is integrated at the output end of the adder 78, whereby substantially the same data as that obtained by integrating the analog signal can be obtained. By doing so, the effect obtained in FIG. 15 can also be obtained by the configuration in FIG.

Further, as the hold device 11 for holding the analog signal, instead of the analog integrating circuits 16A and 16B shown in FIG. 4, the structures shown in FIG. 17 may be applied.
That is, in the case of FIG. 17, the voltage-current conversion circuit 1 of FIG.
The difference is that a filter circuit 81 is provided in place of 9A and 19B. Here, the filter circuit 81 is configured as a high-pass filter, so that the DC component included in the video signal obtained from the camera cannot pass through the filter circuit 81, and as a result, only the video signal is output from the capacitors 20A and 2A.
It will be held at 0B. Therefore, it is possible to reduce the error in the determination result due to the change in the DC component.
In addition to this, the filter circuit 81 limits the frequency of the video signal held in the capacitors 20A and 20B to a specific region, so that the noise included in the low frequency band portion can be removed.

Further, in the hold device having the configuration of FIG. 4, the capacitors 40A and 4A are used to hold a plurality of sample signals.
Analog switch for loading analog memory consisting of 0B 1
Although it has a configuration in which it is connected in parallel via 8A and 18B, instead of this, as shown in FIG.
Analog signals 83A, 83B, ... 83N connected in series with each other through the analog switches 82A, 82B ... 82 (N-1).
To each analog memory 83A, 83B ...
... The measurement output signal S corresponding to each monitoring point in parallel from 83N
31A, S31B ... S31N may be transmitted.

Further, as shown in FIG. 19, if the measured output signal is sent only from the final stage analog memory 83N in the configuration of FIG. 18, the output signal S3 thus obtained is obtained.
2 can send the measurement signal corresponding to each monitoring point in a time series manner. Even in this way, the fourth
The same effect as described above with reference to the drawing can be obtained.

Further, in the above-mentioned embodiment, the synchronizing signal is given from the camera 7 to the synchronizing signal generator 12, but instead of this, the camera 7 is synchronized with the synchronizing signal generated in the synchronizing signal generator 12. Is also good.

As described above, according to the present invention, as means for obtaining an integrated output for a plurality of monitoring areas of a video signal,
When the scanning position of the video signal detected by the x and y position detecting means coincides with the setting position of the monitoring area set in the monitoring position specifying memory means, the corresponding integrating means is selected and specified to thereby select the monitoring area. By integrating the video signal corresponding to, it is possible to obtain information indicating the presence or absence of a change in the detected object with a simple configuration,
By doing so, a low noise detection output can be obtained by the integration effect.

Incidentally, it is conceivable that the video information is temporarily stored in an analog or digital manner and then the video information corresponding to the monitoring area is read and processed. However, it is unavoidable that noise is mixed in the detection output because the entire configuration is complicated and noise is mixed in, but the present invention can effectively solve this problem.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an outline of an object detecting device according to the present invention, FIG. 2 is a block diagram showing a detailed configuration of the object detecting device, and FIG. 3 is a schematic diagram used for explaining a monitoring area. FIG. 4 is a connection diagram showing a detailed configuration of the hold device 11 of FIG. 2, FIG. 5 is a signal waveform diagram showing an acquisition signal given to the hold device 11 from the timing generator 25 of FIG. 2, and FIG. Is a block diagram showing a concrete configuration of the reference value calculation device 27 of FIG. 2, FIGS. 7 and 8 are signal waveform diagrams showing signals of respective parts of FIG. 2, and FIG. 9 is timing generation of FIG. Block diagrams showing the acquisition signal generating circuit 41 included in the device 25 in detail, FIGS. 10 to 12 are schematic diagrams and charts for explaining the configuration of FIG. 9, and FIG. 13 is another monitoring area. 14 is a schematic diagram showing an embodiment, and FIGS. 14 to 16 show still another embodiment of FIG. Block diagram, FIG. 17 is a connection diagram showing another embodiment of the holding device 11 of FIG. 2, and FIGS. 18 and 19 are block diagrams showing still another embodiment of the holding device 11 of FIG. FIG. 20 is a schematic diagram specifically showing the monitoring area set in the embodiment, and FIG. 21 is a table showing data of the monitoring position designation memory of FIG. 1 ... Injection molding machine 2, 3 ... Movable side, fixed side mold, 7 ...
... video camera, 8 ... object detection circuit, 11 ... hold device, 12 ... synchronization signal generator, 25 ... timing generator, 26 ... analog digital converter, 2
7 ... Reference value calculation device, 28 ... Comparison determination device, 41 ...
... Capture signal generation circuit.

Claims (1)

[Claims] 1. Based on a video signal obtained by picking up an image of an object to be detected by a video camera section, the detection section obtains integral information from a plurality of monitor areas on the screen formed by the video signal and makes a determination. In the object detection device for determining that a change occurs in each of the monitoring area portions of the detected object when the integral information of each of the monitoring areas exceeds a reference signal in the monitoring unit, the detection unit includes a plurality of monitoring areas. And the scanning position in the x direction and y based on the video signal.
X position detecting means and y position detecting means for detecting the scanning position in the direction, and set position information and integration means specifying information on the screen for each of the monitoring areas are stored to detect the x position detecting means and the y position detecting means. Monitoring position designation memory means for reading out the setting position information and the integration means specifying information which have reached the matching position when the scanning position of the video signal matches the setting position information based on the output, Selection designation of causing the corresponding integration means to capture the video signal by selectively designating a corresponding integration means of the integration means for a predetermined time based on the read set position information and the integration means designation information. An object detecting device comprising: means for sending the integrated output of the integrating means to the determining section as the integrated information.