TWI392339B - Surveillance system and method - Google Patents

Description

Monitoring system and monitoring method

The present invention relates to a monitoring system and method, and more particularly to a monitoring system and monitoring method that can be monitored under low light conditions.

Surveillance equipment is installed on many occasions in life for remote monitoring or security. Monitoring equipment can also be used in special locations, such as monitoring equipment operating conditions in high temperature or toxic environments, patient conditions in sterile wards, and the like.

Monitoring equipment usually includes a camera, a controller and a memory. The camera is used to capture the image of the monitored area, and transfer the captured picture data to the memory for storage; the controller can be used to control whether the memory stores the picture data, so that the storage can be selectively stored to save storage. space.

The monitoring device usually also includes a monitor for instantly displaying the picture taken by the camera, and also displaying a plurality of monitoring areas on the monitor at the same time. The monitoring device can be used for various types of urban traffic, unsupervised, community security, etc. field.

Since monitoring equipment mostly converts the image of the monitoring area into a signal by means of cameras, cameras, etc., the common problem encountered by the monitoring equipment is that it can only be sensed in an environment with poor lighting conditions such as night, cloudy or darkroom. The imaging effect of the visible light imaging device is not ideal, and even can not work; and the infrared sensing camera device is not only expensive, but also has low resolution, and the monitoring effect is quite limited.

In view of this, it is necessary to provide a monitoring system that can be effectively monitored under low light conditions.

In addition, it is necessary to provide a monitoring method that can be effectively monitored in low light conditions.

A monitoring system includes a camera device, a controller, a brightness detecting device, a sound detecting device, and an auxiliary light source. The camera device is configured to convert images in the monitoring area into image signals. The brightness detecting device is configured to detect the brightness of the light in the monitoring area to generate a brightness detecting signal. The sound detecting device is configured to detect a sound intensity in the monitoring area to generate a sound detecting signal, the controller includes a brightness comparator and a sound comparator, and the brightness comparator is configured to compare the brightness detecting signal with a predetermined brightness threshold. And emitting a signal to turn on the sound detecting device when the brightness detecting signal is less than the brightness threshold, the sound comparator is configured to compare the sound detecting signal with a predetermined sound threshold, and send the sound detecting signal when the sound detecting signal is greater than the sound threshold Signal to turn on the auxiliary light source. The auxiliary light source is used to illuminate the monitoring area.

A monitoring method includes: detecting a brightness of a light in a monitoring area; comparing a detected brightness of the light with a predetermined brightness threshold; and detecting a sound intensity in the monitored area when the brightness of the light is lower than a predetermined brightness threshold; The detected sound intensity is compared to a predetermined sound threshold; When the sound intensity is greater than the sound threshold, an auxiliary light is emitted to illuminate the monitoring area; and the image in the monitoring area is converted into an image signal.

The above monitoring system and monitoring method determine whether to emit auxiliary light to adjust the brightness of the monitoring area to a sufficient intensity by detecting the brightness of the light in the monitoring area, thereby ensuring that a high-quality monitoring picture can be obtained under various lighting conditions, and the monitoring effect can be obtained. improve.

As shown in FIG. 1, the monitoring system 10 of the preferred embodiment includes an imaging device 102, a controller 104, a storage device 106, a brightness detecting device 108, an auxiliary light source 110, and a sound detecting device 112.

The camera device 102 is configured to take a picture in the monitored area as an image signal. The captured image signal is transmitted to storage device 106 for storage.

The controller 104 is configured to send a control signal to the storage device 106 for controlling the storage device 106 to store the image signal. For example, the user can set the controller 104 to store the image signal only when the monitoring area screen is the active screen, so that only the active picture can be recorded in the storage device 106, and most of the repeated still pictures are not recorded, which can save storage. The storage space of device 106.

The brightness detecting device 108 is configured to detect the brightness of the light in the monitoring area to generate a brightness detecting signal. The brightness detection signal is sent to the controller 104, and the controller 104 sends a brightness control signal to the auxiliary light source 110 according to the brightness detection signal. The auxiliary light source 110 emits auxiliary light according to the brightness control signal to illuminate the monitoring area, so that the brightness of the light in the monitoring area is sufficient Combined monitoring requirements. For example, when the brightness detecting device 108 detects that the brightness of the light in the monitoring area is lower than a predetermined value, the controller 104 emits a brightness control signal to control the auxiliary light source 110 to be turned on and emit auxiliary light.

The sound detecting device 112 is for detecting the sound intensity in the monitoring area and generating a sound detecting signal. The sound detection signal is transmitted to the controller 104. The controller 104 sends a storage control signal to the storage device 106 according to the sound detection signal for controlling the storage device 106 to store the image signal. For example, when the sound intensity detected by the sound detecting device 112 is greater than a predetermined value, the storage device 106 stores the image signal.

As another alternative embodiment, the sound detecting device 112 can be turned on or off under the control of the brightness detecting signal. For example, when the brightness detection signal indicates that the brightness of the light in the monitoring area is lower than a predetermined value, the controller 104 emits a sound detection activation signal to turn on the sound detecting device 112. Therefore, when the illumination condition is not good, the sound intensity signal can be used as a supplement to the image signal to control whether the storage device 106 stores the image signal.

Furthermore, in other embodiments, the auxiliary light source 110 can be turned on or off by the combination of the brightness detection signal generated by the brightness detecting device 108 and the sound detecting signal generated by the sound detecting device 112. For example, under the condition that the illumination condition is lower than the predetermined value, when the sound intensity in the monitoring area is greater than the predetermined value, the auxiliary power source is turned on to illuminate the monitoring area, and the storage device 106 stores the image signal.

As shown in FIG. 2, it is a schematic structural diagram of a controller 40 of an embodiment. The controller 40 includes a brightness comparator 402, a first field effect transistor 404, a sound comparator 406, and a second field effect transistor 408.

The brightness detecting device 108 sends the generated brightness detecting signal to the brightness comparator 402. The brightness comparator 402 compares the brightness detecting signal with a predetermined brightness threshold signal, and generates a brightness comparison signal to be sent to the first field effect transistor 404.

The source of the first field effect transistor 404 is coupled to the DC power source V _CC for controlling the opening and closing of the sound detecting device 112 based on the brightness comparison signal. For example, when the brightness detection signal is less than the brightness threshold signal, the brightness comparator 402 sends a conduction signal to the gate of the first field effect transistor, thereby causing the first field effect transistor 404 to be turned on. Thus, the drain of the first field effect transistor 404 connected to the sound detecting device 112 generates an on current to turn on the sound detecting device 112. On the other hand, when the brightness detection signal is greater than the brightness threshold signal, the first field effect transistor 404 is turned off, and the drain current does not generate an on current, and the sound detecting device 112 is not turned on.

The sound detecting device 112 sends the generated sound detecting signal to the sound comparator 406, and the sound comparator 406 compares the sound detecting signal with a predetermined sound threshold signal, and generates a sound comparison signal to the second field effect transistor 408. .

The source of the second field effect transistor 408 is also coupled to the DC power source V _CC for controlling the turning on or off of the auxiliary light source 110 based on the sound comparison signal. For example, when the sound detection signal is greater than the sound threshold signal, the sound comparator 406 sends a conduction signal to the gate of the second field effect transistor such that the second field effect transistor 408 is turned on. Thus, the drain of the second field effect transistor 408 connected to the auxiliary light source 110 generates an on current to turn on the auxiliary light source 110. On the other hand, when the sound detection signal is smaller than the sound threshold signal, the second field effect transistor 408 is turned off, and the drain electrode does not generate the on current, and the auxiliary light source 110 is not turned on.

In other embodiments, the first field effect transistor 404 and the second field effect transistor 408 may be replaced by other types of switching elements. For example, one of the other types of sound detecting switching elements is used, which can send a matching opening or closing signal to the sound detecting device 112 according to the brightness comparison signal sent by the brightness comparator 402; or use one of the other kinds The light source switching element can send a matching opening or closing signal to the auxiliary light source 110 according to the sound comparison signal sent by the sound comparator 406.

In other embodiments, the brightness detection signal generated by the brightness detecting device 108 can be used to adjust the monitoring system 10 to be in different working modes, that is, to adjust the monitoring system according to the intensity of the light in the monitoring area indicated by the brightness detecting signal. Working modes, such as cloudy mode, eye mode, night mode, dusk mode, and the like. Further, depending on the mode of operation, the auxiliary light source 110 can emit auxiliary light of corresponding brightness to complement the insufficient portion of the brightness in the monitoring area, thereby avoiding the energy consumption of the auxiliary light source 110 being set to a single light-emitting brightness.

As shown in FIG. 3, it is a schematic structural diagram of a controller 50 of another embodiment. The controller 50 includes a brightness comparator 502, a mode adjustment module 504, a sound comparator 506, and a light source control module 508.

The brightness detecting device 108 sends the generated brightness detecting signal to the brightness comparator 502, and the brightness comparator 502 compares the brightness detecting signal with a predetermined brightness threshold signal and generates a brightness comparison signal. The brightness comparison signal is sent to the sound detecting device 112 for controlling the sound detecting device 112. Turn it on and off. For example, when the brightness detection signal is greater than the brightness threshold signal, indicating that the brightness of the monitoring area is higher than the predetermined brightness, the sound detecting device 112 is not required to be turned on; otherwise, when the brightness detecting signal is smaller than the brightness threshold signal, indicating that the monitoring is performed. The sound detecting means 112 is turned on when the brightness of the area is lower than the predetermined brightness.

The brightness detection signal generated by the brightness detecting device 108 is also sent to the mode adjustment module 504. The mode adjustment module 504 sends different mode adjustment signals according to the brightness detection signal. For example, the mode adjustment module 504 quantizes the brightness detection signal to different levels according to the signal intensity, and then issues a cloudy mode, a sky mode, a night mode, a dusk mode, etc. according to the level of the brightness detection signal. The signal is adjusted and the mode adjustment signal is transmitted to the light source control module 508.

The sound detecting device 112 sends the generated sound detecting signal to the sound comparator 506, and the sound comparator 506 compares the sound detecting signal with a predetermined sound threshold signal and generates a sound comparison signal. The sound comparison signal is sent to the light source control module 508 for controlling the opening and closing of the auxiliary light source 110.

The light source control module 508 receives the sound comparison signal from the sound comparator 506, and emits a light source control signal for controlling the opening and closing of the auxiliary light source 110 according to the sound comparison signal. On the other hand, the light source control signal is different due to different mode adjustment signals sent by the mode adjustment module 504. For example, when the sound comparison signal indicates that the sound intensity in the monitoring area detected by the sound detecting device 112 is greater than a predetermined sound threshold, and the mode adjusting signal sent by the mode adjusting module 504 is indicated as a cloudy mode, the light source control module Light source control signal issued by 508 The auxiliary light source 110 emits the auxiliary light of the corresponding intensity to illuminate the monitoring area; and when the mode adjustment signal is indicated as the night mode, the light source control signal issued by the light source control module 508 indicates that the auxiliary light source 110 emits a little more than the cloudy mode. Strong auxiliary light.

FIG. 4 is a flow chart of a monitoring method of a preferred embodiment. The flow of the monitoring method is described below in conjunction with the preferred embodiment of the monitoring system shown in FIG. 1.

First, in step 202, the brightness detecting device 108 detects the brightness of the light in the monitored area to determine the lighting conditions within the monitored area.

Step 204: Compare the detected light brightness with a predetermined brightness threshold to determine whether the auxiliary power supply needs to be turned on. If the brightness of the light in the monitored area is lower than the predetermined brightness threshold, then go to step 206, otherwise go to step 220.

Step 206: If the brightness of the light in the monitoring area is lower than a predetermined brightness threshold, the controller 104 issues a brightness control signal.

Step 208, after receiving the brightness control signal, the auxiliary light source 110 emits auxiliary light to illuminate the monitoring area.

In step 210, the sound detecting device 112 detects the sound intensity in the monitored area.

Step 212, comparing the detected sound intensity to a predetermined sound threshold. If the detected sound intensity is greater than the predetermined sound threshold, then step 214 is entered, otherwise step 218 is entered.

Step 214, if the detected sound intensity is greater than a predetermined sound threshold, Then the controller 104 issues a storage control signal.

Step 216, after receiving the storage control signal, the storage device 106 stores the image signal.

Step 218: If the result of the comparison in step 212 is that the detected sound intensity is less than a predetermined sound threshold, the image signal is not stored.

Step 220: If the result of the comparison in step 204 is that the detected light intensity is greater than a predetermined brightness threshold, the auxiliary light source 110 is not turned on.

As shown in FIG. 5, it is a flowchart of a monitoring method of another preferred embodiment, which controls whether to detect the sound intensity in the monitoring area by using the brightness detection result in the monitoring area, and then controls whether to emit auxiliary light according to the detection result. The flow of the monitoring method of the present embodiment will be described below in conjunction with the preferred embodiment of the monitoring system shown in FIG.

First, in step 302, the brightness detecting device 108 detects the brightness of the light in the monitored area to determine the lighting conditions within the monitored area.

Step 304, comparing the detected light ray brightness with a predetermined brightness threshold. If the detected light brightness is less than the predetermined brightness threshold, then step 306 is entered, otherwise step 320 is entered.

Step 306, if the detected light brightness is less than a predetermined brightness threshold, the controller 104 emits a sound detection enable signal.

Step 308, after receiving the sound detection enable signal, the sound detecting device 112 detects the sound intensity in the monitoring area.

Step 310, comparing the detected sound intensity with a predetermined sound threshold. If the detected sound intensity is greater than the predetermined sound threshold, then enter Step 312, otherwise go to step 318.

Step 312, if the detected sound intensity is greater than a predetermined sound threshold, the controller 104 emits a brightness control signal.

Step 314, after receiving the brightness control signal, the auxiliary light source 110 emits auxiliary light to illuminate the monitoring area.

In step 316, the storage device 106 stores the image signal.

Step 318: If the result of the comparison in step 310 is that the detected sound intensity is less than a predetermined sound threshold, the auxiliary light source 110 is not turned on.

Step 320: If the result of the comparison in step 304 is that the detected light intensity is greater than a predetermined brightness threshold, the auxiliary light source 110 and the sound detecting device 112 are not turned on.

As shown in FIG. 6 , it is a flowchart of another preferred embodiment of the monitoring method, which can select different working modes according to different lighting conditions, thereby controlling the auxiliary light source to emit auxiliary light of corresponding intensity. The flow of the monitoring method of the present embodiment will be described below with reference to a preferred embodiment of the monitoring system shown in FIG.

First, in step 602, the brightness detecting device 108 detects the brightness of the light in the monitored area to determine the lighting conditions within the monitored area.

In step 604, the brightness comparator 502 compares the detected light brightness to a predetermined brightness threshold. If the detected light brightness is less than the brightness threshold, then step 606 is entered, otherwise step 624 is entered.

Step 606, if the detected light brightness is less than a predetermined brightness threshold, the brightness comparator 502 emits a sound detection enable signal.

Step 608, after receiving the sound detection enable signal, the sound detecting device 112 detects the sound intensity in the monitoring area.

In step 610, the sound comparator 506 compares the detected sound intensity to a predetermined sound threshold. If the detected sound intensity is greater than the predetermined sound threshold, then step 612 is entered, otherwise step 622 is entered.

In step 612, the mode adjustment module 504 receives the brightness detection signal generated by the brightness detecting device 108 and quantizes it to determine which mode the monitoring system should be adjusted to operate.

In step 614, the mode adjustment module 504 sends a mode adjustment signal of the corresponding level to the light source control module 508 according to the quantization result.

In step 616, the light source control module 508 sends a light source control signal to the auxiliary light source 110 according to the mode adjustment signal sent by the mode adjustment module 504.

Step 618, after receiving the light source control signal, the auxiliary light source 110 emits auxiliary light of corresponding intensity according to the light source control signal to illuminate the monitoring area.

In step 620, the storage device 106 stores the image signal.

Step 622: If the result of the comparison in step 610 is that the detected sound intensity is less than a predetermined sound threshold, the auxiliary light source 110 is not turned on.

Step 624: If the result of the comparison in step 604 is that the detected light intensity is greater than a predetermined sound threshold, the auxiliary light source 110 and the sound detecting device 112 are not turned on.

The above monitoring system and monitoring method determine whether to emit auxiliary light to detect the brightness of the monitoring area to the foot by detecting the brightness of the light in the monitoring area. Sufficient strength, so that high-quality monitoring screens can be obtained under various lighting conditions, and the monitoring effect can be improved.

The above monitoring system can also use sound as a supplementary means when the lighting conditions are not ideal, and turn on the auxiliary power source and store the image signal when the sound intensity in the monitoring area is higher than a predetermined value. Furthermore, it is also possible to control the auxiliary light source to emit auxiliary light of different brightness according to different lighting conditions, and to avoid energy consumption caused by the auxiliary light source being set to a single light-emitting brightness.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above is only a preferred embodiment of the present invention, and those skilled in the art will be able to include equivalent modifications or variations in the spirit of the present invention.

10‧‧‧Monitoring system

102‧‧‧ camera

104, 40, 50‧ ‧ controller

106‧‧‧Storage device

108‧‧‧Brightness detection device

110‧‧‧Auxiliary light source

112‧‧‧Sound detection device

402, 502‧‧‧Brightness comparator

404‧‧‧The first effect transistor

406, 506‧‧‧ sound comparator

408‧‧‧Second effect transistor

504‧‧‧Mode Adjustment Module

508‧‧‧Light source control module

202~220, 302~320, 602~624‧‧‧ Monitoring method flow

1 is a schematic structural view of a monitoring system of a preferred embodiment.

2 is a schematic structural view of a controller of a preferred embodiment.

3 is a schematic structural view of a controller of another preferred embodiment.

4 is a flow chart of a monitoring method of a preferred embodiment.

FIG. 5 is a flow chart of a monitoring method of another preferred embodiment.

6 is a flow chart of a monitoring method of another preferred embodiment.

10‧‧‧Monitoring system

102‧‧‧ camera

104‧‧‧ Controller

106‧‧‧Storage device

108‧‧‧Brightness detection device

110‧‧‧Auxiliary light source

112‧‧‧Sound detection device

Claims (12)

A monitoring system includes an imaging device for converting an image in a monitoring area into an image signal, wherein the monitoring system further comprises: a controller, a brightness detecting device, a sound detecting device, and an auxiliary light source, the brightness The detecting device is configured to detect the brightness of the light in the monitoring area to generate a brightness detecting signal, the sound detecting device is configured to detect the sound intensity in the monitoring area to generate a sound detecting signal, and the controller comprises a brightness comparator and a sound comparator. The brightness comparator is configured to compare the brightness detection signal with a predetermined brightness threshold, and send a signal to turn on the sound detecting device when the brightness detecting signal is less than the brightness threshold, the sound comparator is configured to use the sound detecting signal and the predetermined sound detecting signal The sound threshold is compared, and a signal is emitted to turn on the auxiliary light source when the sound detecting signal is greater than the sound threshold, and the auxiliary light source is used to illuminate the monitoring area. The monitoring system of claim 1, wherein the monitoring system further comprises a storage device, the storage device being connected to the camera device for storing the image signal. The monitoring system of claim 2, wherein the controller can send a storage control signal to the storage device according to the sound detection signal to control whether the storage device stores the image signal. The monitoring system of claim 3, wherein the storage device stores the image signal when the sound detecting signal is greater than the sound threshold. The monitoring system of claim 1, wherein the controller comprises a light source switching element, and the light source switching element can send a matching light source opening and closing signal to the auxiliary light source according to the sound comparison signal sent by the sound comparator. . The monitoring system of claim 5, wherein the light source switching element is a field effect transistor. The monitoring system of claim 1, wherein the controller includes a mode adjustment module, the mode adjustment module receives the brightness detection signal, quantizes and classifies the brightness detection signal, and generates a mode adjustment signal. And controlling the auxiliary light source to emit auxiliary light of corresponding intensity in each working mode to illuminate the monitoring area. The monitoring system of claim 7, wherein the controller further comprises a light source control module, wherein the light source control module is configured to receive the mode adjustment signal, and adjust the signal according to the mode to send a light source control signal to the An auxiliary light source that emits a corresponding intensity of auxiliary light according to the auxiliary light source. The monitoring system of claim 1, wherein the monitoring system further comprises a storage device, the storage device being connected to the camera device for storing the image signal. A monitoring method includes: detecting a brightness of a light in a monitoring area; comparing a detected brightness of the light with a predetermined brightness threshold; and detecting a sound intensity in the monitored area when the brightness of the light is lower than a predetermined brightness threshold; The detected sound intensity is compared with a predetermined sound threshold; when the sound intensity is greater than the sound threshold, the auxiliary light is controlled to illuminate the monitoring area; and the image in the monitored area is converted into an image signal. The monitoring method of claim 10, wherein the monitoring method further comprises: The brightness of the light is graded; when the sound intensity is greater than a predetermined sound threshold, the auxiliary light of the corresponding intensity is emitted according to different levels of the brightness of the light. The monitoring method of claim 10, wherein the monitoring method further comprises: storing the image signal.