JPH0792945A - Picture display control device - Google Patents

Abstract

PURPOSE:To provide a picture display control device in which a display content is not erased in midway and a display part is not kept in an on-state even when an operator does not operate. CONSTITUTION:This device is provided with a video camera 11 monitoring the front state of a display device 4, a memory 12 in which the front state of the display device 4 is stored previously as an initial state from the video camera 11, a comparison circuit 13 comparing the monitoring state of the video camera 11 with the initial state in the memory 12 and outputting a first signal when those states are different each other and a second signal when states are the same, a timmer 14 starting a time measurement when the second signal is inputted and outputting a third signal when the measurement time elapsed a prescribed time and a display control part 15 making the display part of the display device 4 on-state when the first signal is inputted and making the display part of the display device 4 off-state when the second and third signals are inputted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display control device for controlling an image displayed on a display device of a radar or sonar or a monitoring device of a production line in a factory.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram for explaining a conventional image display control device. Reference numeral 1 is an operation unit, such as a keyboard, which is composed of a character or a graphic on a display unit (not shown) of a display unit 4. Is displayed. A high-level operation signal is output during operation, and the operation signal is set to low level when no operation is performed. A timer 2 starts counting time when the input high-level operation signal is switched to low level, and outputs a time-up signal when the counting time exceeds a predetermined time. When a high-level operation signal is input during time counting, the time counting time is reset.

Reference numeral 3 is a display control unit which displays on the display device 4 when a high level operation signal is input.
When a time-up signal is input, a display-off signal is output to the display device 4. The display device 4 turns the display unit on when the display on signal is input, and turns the display unit off when the display off signal is input.

Next, the operation of the conventional image display control device configured as described above will be described. When the operation unit 1 is being operated, the operation unit 1 outputs a high-level operation signal, so the display control unit 3 continuously outputs the display-on signal to the display device 4, and the display device 4 Inputs the signal to turn on the display unit. Then, when the operation is interrupted, the operation unit 1 switches the level of the operation signal from high to low, so that the timer 2 starts time counting by the input of the signal, and when the time counting time exceeds a predetermined time, the time is up. The signal is output to the display control unit 3. Although the display control unit 3 holds the output of the display-on signal when the timer 2 is measuring time, the display content of the display unit of the display device 4 is continuously displayed.
When the time-up signal is input, a display-off signal is output to the display device 4. The display device 4 to which the display off signal is input turns off the display unit in the on state.
Set to f and erase the displayed contents.

[0005]

In the conventional image display control apparatus as described above, when the operator confirms or monitors the display contents of the display section without operating the operation section 1, the display is displayed during the operation. The contents sometimes disappeared. This is due to the function of the timer 2, but there has been the trouble of having to perform an operation for displaying the display content every time the display section is turned off. Conventionally, in order to solve such annoyance, a control stop switch for stopping the function of the display control was installed, but sometimes it is forgotten to cancel the stop of that function, and in such a case, Since the display unit is in the on state for a long time, there is a problem that the life of the display unit is shortened and power is wasted.

The present invention has been made to solve the above problems, and an image display that does not cause the display contents to disappear in the middle or the display section to remain in the ON state without the operator's operation. An object is to provide a control device.

[0007]

An image display control apparatus according to the present invention comprises a monitoring means for monitoring a state in front of a display device, and a storage means for storing the state in front of the display device as an initial state in advance from the monitoring means. Comparing the monitoring state of the monitoring means and the initial state of the storage means, outputting a first signal when the states are different, and outputting a second signal when the states are substantially the same or the same. Inputting the first signal, a comparing means, a time measuring means for starting time counting when the second signal is input, and outputting a third signal when the time counting time has passed a preset time. Display control means for turning on the display unit of the display device when the input signal is input, and turning off the display unit of the display device when the second signal and the third signal are input. It is those with a.

[0008]

In the present invention, the storage means stores the initial state in front of the display device from the monitoring means in advance. This initial state is, for example, a state when the operator is not in front of the display device. When the monitoring means outputs the state in front of the display device to the comparing means, the storing means outputs the initial state to the comparing means, so that the comparing means compares the monitoring state of the monitoring means with the initial state of the storing means. Then, as a result of the comparison, when the states are different, the first signal is output to the display control means. The difference between the two states is that the monitoring means has caught the operator in front of the display device, and in such a case, the display control means turns on the display section of the display device. Further, as a result of the comparison, when the two states are substantially the same, the second signal is output to the timing means and the display control means. The term "substantially the same" means that the state in front of the display device captured by the monitoring means is almost the same as the initial state, that is, when there is no operator. At this time, the time counting means starts time counting by the input of the second signal, and outputs the third signal to the display control means when the time counting time has passed a preset time. When the third signal is input, the display control means to which the second signal is input changes the display unit of the display device from the on state to the off state.

[0009]

1 is a block diagram for explaining an embodiment of the present invention. Incidentally, the same or corresponding parts as those of the conventional example described in FIG.

In the figure, reference numeral 11 denotes, for example, a video camera corresponding to the monitoring means of the present invention, which is provided in the display device 4 and outputs an image in front of it as a video signal. 1
Reference numeral 2 is a memory of the storage means, and for example, an image when no operator is in front of the display device 4 is stored as initial image data. This data is for video camera 1
It is input at 1, and is stored when the initial image setting signal is output to the memory 12. When the video signal is output from the video camera 11, the initial image data is output as the initial image signal.

Reference numeral 13 is a comparison circuit of the comparison means of the present invention, which compares the video signal from the video camera 11 with the initial image signal from the memory 12 (calculates the degree of correlation).
When the video signal contains the image of the operator, the degree of correlation is low, so a low-level comparison signal is output, and when the video signal does not contain the image of the operator, the degree of correlation is high. It outputs a high-level comparison signal.

Reference numeral 14 is a timer of a time measuring means, which is a comparator circuit 13.
When the comparison signal from is low level, a low level signal is output, and when the comparison signal is high level, time counting is started. Then, when the measured time has passed a predetermined time, a high level signal is output. When a low-level comparison signal is input during time counting, the time counting is reset. Reference numeral 15 is a display control unit, which is a comparison circuit 1.
When the comparison signal from 3 and the output signal of the timer 14 are both at high level, the display off signal is output to the display device 4, and when both of these signals are at low level, the display on signal is output to the display device 4. .

In the image display control device configured as described above, first, the operation when the operator is in front of the display device 4 will be described. At this time, the video camera 11 outputs the video signal containing the image of the operator to the comparison circuit 13, so the comparison circuit 13 compares the input video signal with the initial image signal from the memory 12,
In this case, the video signal is the image data when the operator is in front of the display device 4, and the initial image signal is the image data when the operator is not present. Therefore, the low-level comparison signal is sent to the timer 14 and the display controller 15. And output to. Therefore, the display control unit 15 outputs a display-on signal to the display device 4, and the display device 4 holds the on-state of the display unit (not shown) by the input of the display-on signal.

Next, the operation when the operator is not in front of the display device 4 will be described. At this time,
Since the video signal from the video camera 11 becomes the image data when there is no operator in front of the display device 4, the comparison circuit 13 compares it with the initial image signal from the memory 12, and in this case, the correlation of the two signals. Therefore, the low-level comparison signal is switched to the high level and output to the timer 14 and the display control unit 15. The timer 14 to which the high-level comparison signal is input starts counting time, and outputs a high-level signal to the display control unit 15 when the counted time exceeds a predetermined time. The display control unit 15 outputs the display-on signal to the display device 4 when the timer 14 measures the time, but outputs the display-off signal when the high-level signal is input. Therefore, the display device 4 turns on the display unit.
Turn off the state and erase the displayed contents.

When the operator sits in front of the display device 4, the comparison circuit 13 outputs the low-level comparison signal to the timer 14 and the display controller 15 as described above, so that the timer 14 outputs the high-level signal. Is switched to the low level and is output to the display control unit 15, whereby the display control unit 15 outputs the display on signal to the display device 4, and the display device 4 turns the display unit on again by the input of the display on signal. Display the content again.

Although the video camera 11 is used as the monitoring means in the above embodiment, the state in front of the display device 4 is monitored by using a sound sensor for detecting sound and an optical sensor including an infrared sensor. You may do it. In addition, one video camera 11 is installed in one display device 4 and an image in front of the display device 4 is taken.
It is also possible to take images of the front of the plurality of display devices 4.

[0017]

As described above, according to the present invention, when the state in front of the display device captured by the monitoring means is different from the initial state of the memory, the display unit of the display device is turned on to turn on the front of the display device. Since the display unit is turned off when the state of (1) and the initial state of the memory are almost the same or the same, the troublesome operation during the monitoring of the display content is eliminated and the display content does not disappear in the middle. In addition, it is possible to prevent the life of the display device from being shortened due to forgetting to turn off the display unit, prevent unnecessary power consumption, and extend the replacement period for maintenance of the display device.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining an embodiment of the present invention.

FIG. 2 is a block diagram for explaining a conventional image display control device.

[Explanation of symbols]

 4 Display Device 11 Video Camera 12 Memory 13 Comparison Circuit 14 Timer 15 Display Control Section

Claims (1)

[Claims] 1. A monitoring means for monitoring a state in front of the display device, a storage means for storing the state in front of the display device as an initial state from the monitoring means in advance, a monitoring state of the monitoring means and an initial state of the storage means. And when the states are different, the first signal is output, and when the states are almost the same or the same, the second signal is output.
Comparing means for outputting a signal, and starting time measurement when the second signal is input,
When the measured time has passed a preset time, the third
A clocking means for outputting a signal, and a display unit of the display device being turned on when the first signal is input, and a display of the display device when the second signal and the third signal are input. An image display control apparatus, comprising: a display control unit for turning off the unit.