CN105844209B - visitor identification based on infrared radiation detection - Google Patents
visitor identification based on infrared radiation detection Download PDFInfo
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- CN105844209B CN105844209B CN201610053431.3A CN201610053431A CN105844209B CN 105844209 B CN105844209 B CN 105844209B CN 201610053431 A CN201610053431 A CN 201610053431A CN 105844209 B CN105844209 B CN 105844209B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/20—Movements or behaviour, e.g. gesture recognition
- G06V40/23—Recognition of whole body movements, e.g. for sport training
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/10—Detecting, e.g. by using light barriers
Abstract
The invention provides a visitor identification method based on infrared radiation detection, which comprises the following steps: an infrared pulse wave transmitting module transmits infrared pulses to the outside of the door; receiving the transmitted infrared pulse through an infrared receiving module, wherein the infrared receiving module is provided with a filtering device to allow infrared light with the same wavelength as the infrared light transmitted by the infrared pulse transmitting module to pass through; checking the difference between the reflected infrared intensity of the infrared light received by the infrared receiving module and the set background infrared intensity; responding to the reflected infrared intensity higher than the set background infrared intensity and sending a first response signal to the indoor host when the difference value between the reflected infrared intensity and the set background infrared intensity reaches a set first threshold value; the indoor host wakes up based on the first response signal. According to the visitor identification method, the visitor dynamics is determined based on the comparison between the infrared intensity monitored in real time and the background infrared intensity and the change trend of the difference value of the infrared intensity monitored in real time, and the timeliness, accuracy and anti-interference performance of identification are greatly improved.
Description
Technical Field
The invention relates to the technical field of electronic doorbell monitoring systems, in particular to visitor identification based on infrared radiation detection.
Background
In the existing electronic doorbell induction system, PIR type passive induction is mostly adopted for human body induction, and the principle is that an infrared detection sensor is used for detecting temperature change in a surrounding area so as to determine whether visitors exist in the surrounding area. The behavior of the visitor is then determined in a limited manner by the duration of the temperature change, such as the automatic visitor identification method and the doorbell system disclosed in the chinese patent CN 102855716B. Since the detector can only detect whether there is a temperature change, there are several disadvantages to this approach:
1. if the visitor is still, even if the visitor is in the detection range, the method cannot detect whether the visitor is in the detection range, namely the PIR method can determine that the visitor is in the detection range when being triggered, but the visitor cannot be determined as being out of the detection range when not being triggered;
2. The sensing directivity is not strong, so that the sensing head is likely to be triggered within 360 degrees around, the specific direction of a person cannot be judged, and the distance between a visitor and the sensing head cannot be judged;
3. Only whether a person is in the range can be known, and the arrival and departure of the person cannot be accurately judged;
4. When the ambient temperature is close to the human body temperature (35 ℃), the device is easy to lose effectiveness or trigger by mistake;
5. the PIR induction head can work effectively only by being exposed on the surface of a machine due to the principle limitation, and is easy to damage artificially.
Disclosure of Invention
the invention provides a visitor identification method based on infrared radiation detection, which comprises the following steps:
An infrared pulse wave transmitting module transmits infrared pulses to the outside of the door;
receiving the transmitted infrared pulse through an infrared receiving module, wherein the infrared receiving module is provided with a filtering device to allow infrared light with the same wavelength as that of the infrared light transmitted by the infrared pulse transmitting module to pass through;
Checking the difference between the reflected infrared intensity of the infrared light received by the infrared receiving module and the set background infrared intensity;
Responding to the reflected infrared intensity higher than the set background infrared intensity and sending a first response signal to the indoor host when the difference value between the reflected infrared intensity and the set background infrared intensity reaches a set first threshold value; and
The indoor host wakes up based on the first response signal.
according to the improvement of the invention, the visitor identification system based on infrared radiation detection is also provided, which comprises an outdoor unit arranged on the outer side of the door and an indoor host arranged on the inner side of the door, wherein:
the outdoor unit is provided with an infrared pulse wave transmitting module for transmitting infrared pulses at an initial working frequency and an infrared receiving module for receiving the infrared pulses to detect infrared intensity, and the infrared receiving module is provided with a filtering device which is set to only allow infrared light with the same wavelength as that of the infrared light transmitted by the infrared pulse wave transmitting module to pass through; the infrared receiving module and the infrared pulse wave transmitting module work at the same frequency at the same time;
The outdoor unit is further configured to send a first response signal to the indoor host computer when a difference value between the reflected infrared intensity of the infrared light received by the infrared receiving module and a set background infrared intensity reaches a set first threshold value;
and the indoor host wakes up when receiving the first response signal and controls and increases the working frequency of the infrared pulse wave transmitting module and the infrared receiving module.
it should be understood that all combinations of the foregoing concepts and additional concepts described in greater detail below can be considered as part of the inventive subject matter of this disclosure unless such concepts are mutually inconsistent. In addition, all combinations of claimed subject matter are considered a part of the presently disclosed subject matter.
The foregoing and other aspects, embodiments and features of the present teachings can be more fully understood from the following description taken in conjunction with the accompanying drawings. Additional aspects of the present invention, such as features and/or advantages of exemplary embodiments, will be apparent from the description which follows, or may be learned by practice of specific embodiments in accordance with the teachings of the present invention.
Drawings
The drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures may be represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. Embodiments of various aspects of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a visitor identification system based on infrared radiation detection in accordance with certain embodiments of the invention.
FIG. 2 is a schematic diagram of an interrupt generation format for visitor identification based on infrared radiation detection in accordance with certain embodiments of the present invention.
Figure 3 is a flow diagram illustrating an implementation of visitor identification based on infrared radiation detection in accordance with some embodiments of the invention.
Fig. 4 is a schematic diagram of an infrared radiation based detection process according to some embodiments of the invention.
Detailed Description
In order to better understand the technical content of the present invention, specific embodiments are described below with reference to the accompanying drawings.
in this disclosure, aspects of the present invention are described with reference to the accompanying drawings, in which a number of illustrative embodiments are shown. Embodiments of the present disclosure are not necessarily intended to include all aspects of the invention. It should be appreciated that the various concepts and embodiments described above, as well as those described in greater detail below, may be implemented in any of numerous ways, as the disclosed concepts and embodiments are not limited to any one implementation. In addition, some aspects of the present disclosure may be used alone, or in any suitable combination with other aspects of the present disclosure.
referring to figures 1, 2 and 3, the present invention is generally based on the detection of infrared radiation for the identification of visitors, according to an embodiment of the present invention. When infrared pulse is transmitted to an unobstructed background environment outdoors, an infrared intensity is obtained, similarly, when the visitor arrives in normal work, the transmitted infrared ray is reflected by the visitor to change the received infrared intensity, the possibility of the visitor is judged based on the change, and an indoor host is awakened based on the change, so that the visitor is transmitted with a higher frequency outside a control room, the visitor is more accurately and precisely identified, the dynamics of the visitor, such as leaving, approaching, too approaching and the like, is judged based on the change trend of the infrared intensity difference, the visitor is accurately identified by combining the monitoring of a doorbell, and the processing of corresponding passersby, normal visitors, suspicious visitors and high-risk visitors is facilitated.
fig. 1 is a schematic diagram of a visitor identification system based on infrared radiation detection according to an embodiment of the present invention, which includes an outdoor unit 100 and an indoor host 200. The outdoor unit 100 is installed outside the door, and the indoor unit 200 is installed inside the door.
As shown in fig. 1, the outdoor unit 100 has an infrared pulse wave transmitting module 101 and an infrared receiving module 102. The ir receiving module 102 may detect the intensity of the ir radiation and transmit the ir radiation to the indoor unit 200 through a communication link between the outdoor unit 100 and the indoor unit 200.
In this example, the infrared pulse wave transmitting module 101 is configured to transmit an infrared pulse to a detection area outside the door, and the infrared receiving module 102 is configured to receive the infrared pulse to detect the infrared intensity. As shown in fig. 1, the infrared receiving module 102 is further provided with a filtering device 102a configured to allow only infrared light with the same wavelength as the infrared light emitted by the infrared pulse emitting module 101 to pass through.
On the premise that the detection area is not obstructed, the infrared pulse wave transmitting module 101 transmits infrared pulses in the infrared pulse transmitting direction, and the infrared receiving module 102 receives and records the infrared intensity information at that time as background infrared intensity. This is a calibration operation.
When the outdoor unit 100 is normally operated, the infrared pulse wave transmitting module 101 continuously transmits infrared pulses in the infrared pulse transmitting direction, and the infrared receiving module 102 operates simultaneously therewith to detect whether there is a visitor.
if there is no visitor in the emitting direction of the infrared pulse, the infrared intensity reading received and obtained by the infrared receiving module 102 will be consistent with the background infrared intensity.
If there is a visitor in the radiation direction of the infrared pulse, the infrared light will be partially reflected to the infrared receiving module 102, and the reading of the infrared light intensity on the infrared receiving module 102 will be higher than the pre-stored background infrared intensity. And, the closer the visitor is to the infrared pulse emitting module 101, the higher the infrared light intensity reading on the infrared receiving module 102.
At this time, the distance from the visitor to the probe can be estimated according to the difference between the infrared light intensity reading on the infrared receiving module 102 and the background infrared intensity. Then, according to a preset threshold, for example, the first threshold, when the difference is greater than or equal to the preset threshold, the infrared receiving module 102 generates an interrupt (i.e., a response signal) to notify the indoor host 200 via the communication link, and transmits the difference to the indoor host 200.
The indoor host 200 wakes up from the sleep state after receiving the aforementioned interrupt, i.e., response signal. In this example, the indoor host 200 is in a sleep state when it normally operates (when a response signal is not received), and wakes up when there is a possibility of a guest, i.e., when it receives the aforementioned response signal.
In a preferred example, the infrared pulse wave transmitting module 101 transmits an infrared pulse at a set initial operating frequency when transmitting the infrared pulse to the outside of the door, and the infrared receiving module 102 operates at the same frequency as the infrared pulse wave transmitting module 101.
as described above, after the indoor host 200 wakes up, the operating frequencies of the aforementioned infrared pulse wave transmitting module 101 and infrared receiving module 102 are controlled to be increased, that is, when there is a potential visitor, the infrared pulse wave transmitting module 101 and infrared receiving module 102 will transmit and receive infrared pulses at a faster operating frequency to ensure the detection accuracy, and the indoor host 200 continuously receives and reads the difference between the infrared reading obtained by the infrared receiving module 102 and the background infrared.
After receiving the difference, the indoor host 200 determines the leaving or approaching of the visitor based on the variation trend of the difference between the reflected infrared intensity of the infrared light and the set background infrared intensity. In conjunction with the illustration shown in fig. 4, the distance can be determined from the intensity of the received reflected infrared, and whether the visitor is away or close can be determined from the increase or decrease in intensity (and thus the change in intensity difference), which is the most central place in the present embodiment of passive infrared.
For example, if this difference is getting smaller, the guest is leaving, whereas if the guest is approaching (i.e., approaching the door).
of course, i can adjust the infrared radiation detection range by adjusting the magnitude of the initial operating frequency. For example, an adjustment program and/or an adjustment button is provided on the indoor host 200 for adjusting the magnitude of the initial operating frequency. The initial operating frequency thus set is stored in the first memory 104 of the outdoor unit 100 after being set. In some examples, such a first memory 104 may also be designed and/or formed integrally with the infrared receiving module 102.
As shown in fig. 1, the outdoor unit 100 further includes a first processor 103 and a first memory 104, the reflected infrared intensity of the infrared light and the set background infrared intensity are stored in the first memory 104, and the first processor 103 is configured to control the operation of the whole outdoor unit 100, for example: the infrared pulse wave transmitting module 101 and the infrared receiving module 102 are controlled to work according to the set initial working frequency and/or the increased working frequency, the difference between the infrared intensity obtained in real time by the infrared receiving module 102 and the pre-stored background infrared intensity is obtained through processing and calculation, the interruption is generated and the transmission to the indoor host 200 is controlled based on the difference, and the transmission of the difference is controlled. Such a first processor 103 and a first memory 104 may be implemented by using existing processors and storage media, such as a single chip, a controller of an embedded architecture, a microprocessor, a flash memory, and the like.
With reference to the method for identifying a visitor based on infrared radiation detection shown in fig. 3, a process of identifying and processing the visitor by the indoor host 200 based on a difference between an infrared intensity obtained by the infrared receiving module in real time and a pre-stored background infrared intensity will be described in more detail below.
As shown in fig. 1, 2 and 3, after the outdoor unit 100 generates an interrupt and sends a response signal to the indoor host 200, the indoor host 200 wakes up accordingly and enters a continuous monitoring state, and the indoor host 200 controls to increase the operating frequencies of the ir pulse wave transmitting module 101 and the ir receiving module 102, so as to acquire the motion state information of the visitor more quickly and accurately, and simultaneously, sends the difference value acquired in real time to the indoor host 200. The indoor host 200 enters corresponding guest processes, including passing guest processes, normal guest processes, suspicious guest processes, and high-risk guest processes, based on the difference data, such as a variation tendency of the difference and whether the guest leaves the detection area for a set time period, monitoring a doorbell operation, and the like. This will be further explained below.
Referring to fig. 3, in response to the difference between the reflected infrared intensity and the set background infrared intensity showing a gradually decreasing trend and being away from the monitoring distance within the set first time period (further away from the camera device outside the door, such as the probe), the indoor host 200 determines that the visitor is leaving, i.e., the visitor is a passing visitor, the indoor host 200 resets the infrared receiving module 102 and the infrared pulse wave emitting module 101 to operate at the initial operating frequency, and the indoor host goes to sleep until being awakened again.
if the visitor does not leave within the first time period but gradually approaches the camera device outside the door, that is, the difference value shows a gradually increasing trend, in response to that the difference value between the reflected infrared intensity and the set background infrared intensity shows a gradually increasing trend, and the doorbell operation is monitored within the set second time period, the indoor host 200 judges that the visitor is a normal visitor, and then enters normal visitor processing, for example, controls the doorbell to sound normally or with a set doorbell.
here, the interval T2 of the second duration is greater than the interval T1 of the first duration.
If the visitor is still approaching (i.e. the aforementioned difference value shows a gradually increasing trend), and the doorbell operation is not monitored in the second time period, the indoor host 200 will control to start the outdoor live image information collection, for example, control to start the outdoor camera device to collect the outdoor (visitor) image and/or video, and if the visitor is too close to the doorbell, for example, less than 20cm, the visitor may be a suspicious visitor.
With reference to fig. 3, in response to that the difference between the reflected infrared intensity and the set background infrared intensity shows a gradually increasing trend, and no doorbell operation is monitored within the set second time period, the indoor host determines that the visitor is a suspicious visitor and further controls to increase the operating frequencies of the infrared pulse wave transmitting module and the infrared receiving module again. Therefore, under the condition that the visitor is judged to be a suspicious visitor, the behavior of the suspicious visitor is tracked at a higher frequency, so that the state of the visitor is detected in the fastest time, and the danger or the possibility of the danger is found in advance.
referring to fig. 3, when the visitor is determined as a suspicious visitor (the difference between the reflected infrared intensity and the set background infrared intensity still shows a gradually increasing trend), if the visitor still does not leave the detection area for the third time period (i.e. does not leave the monitoring distance), and the doorbell is not pressed (i.e. doorbell operation is not detected), or the visitor is too close to the doorbell, for example, less than 10cm, it is determined as a high-risk visitor, and the high-risk visitor is treated and the alarm is given in one of the following manners: comprising at least one of the following operations: and sending out sound and/or light alarm information, sending the alarm information to a set contact person and sending the alarm information to a public alarm platform. Of course, as shown in fig. 3, when the visitor presses the doorbell, the visitor is determined as a normal visitor, and the visitor enters normal visitor processing.
That is, in response to the difference between the aforementioned reflected infrared intensity and the set background infrared intensity exhibiting a tendency to gradually increase, and: 1) the visitor does not leave the monitoring distance within a set third time length, and the doorbell operation is not detected; or 2) judging that the visitor is too close to the doorbell according to the difference, judging that the visitor is a high-risk visitor by the indoor host 200, and entering the high-risk visitor for processing.
In the previous example, the interval T3 of the third duration is greater than the interval T2 of the second duration.
As shown in fig. 3, after all of the pass-through guest processing, normal guest processing, suspicious guest processing, and high-risk guest processing, the indoor host 200 will sleep until it is awakened again.
As shown in fig. 1, the in-room host 200 has a display 201, a speaker 202, a network connector 203, control buttons 204, a second processor 205, and a second memory 206. The display 201 is used for displaying the working state information of the indoor host 200, and visual feedback such as image information and warning information collected by the camera device outside the door to the user. The speaker 202 is used for playing the reminder information and/or the alarm information according to the control of the second processor 204. The network connector 203 is used to connect the indoor host 200 to a network, such as the internet, a local area network, etc., so as to transmit ladder information or alarm information to a user, a public alarm platform, or a set mobile phone. The control buttons 204, including, for example, power on/off, function setup buttons, active monitor buttons, etc., are designed to trigger or invoke corresponding functions.
The second processor 205 is configured to control the operation of the indoor host 200, for example, comprehensively determine the type of the visitor based on the read change trend of the difference value and whether the visitor leaves, operates the doorbell, is too close to the doorbell within a set time range, and enter a corresponding visitor processing flow.
a second memory 206 arranged for storing processing for execution by the second processor 205 to implement the above-mentioned specific type identification of the guest and corresponding procedures, some specific examples of such processing procedures, in conjunction with the procedure shown in fig. 3, as described in the above steps, for example:
The indoor host 200 decides the leaving or approaching of the visitor based on the variation trend of the difference between the reflected infrared intensity of the infrared light and the set background infrared intensity;
the indoor host 200 controls to increase the operating frequencies of the infrared pulse wave transmitting module 101 and the infrared receiving module 102 in response to the response signal (i.e., the interrupt shown in fig. 2);
in response to the fact that the difference between the reflected infrared intensity and the set background infrared intensity shows a gradually decreasing trend and leaves the monitoring distance within the set first time period, the indoor host 200 determines that the visitor leaves, and resets the infrared receiving module 102 and the infrared pulse wave transmitting module 101 to operate at the initial operating frequency and enter the sleep mode.
Responding to the fact that the difference value between the reflected infrared intensity and the set background infrared intensity shows a gradually increasing trend, monitoring the doorbell operation within the set second time length, and judging the visitor as a normal visitor by the indoor host;
in response to the fact that the difference between the reflected infrared intensity and the set background infrared intensity is gradually increased and the doorbell operation is not monitored within the set second time period, the indoor host 200 determines that the visitor is a suspicious visitor and controls to increase the operating frequencies of the infrared pulse wave transmitting module and the infrared receiving module again.
When the indoor host 200 enters suspicious visitor processing, controlling and starting the collection of images and/or images outside the door;
In response to a tendency that a difference between the aforementioned reflected infrared intensity and a set background infrared intensity shows a gradual increase, and: 1) the visitor does not leave the monitoring distance within a set third time length, and the doorbell operation is not detected; or 2) judging that the visitor is too close to the doorbell according to the difference, judging that the visitor is a high-risk visitor by the indoor host 200, and entering the high-risk visitor for processing.
Here, the second processor and the second memory may also be, for example, the processor and the memory in the prior art, such as a microprocessor, a single chip, a flash memory, and the like.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the protection scope of the present invention should be determined by the appended claims.
Claims (10)
1. a visitor identification method based on infrared radiation detection is characterized by comprising the following steps:
An infrared pulse wave transmitting module transmits infrared pulses to the outside of the door;
Receiving the transmitted infrared pulse through an infrared receiving module, wherein the infrared receiving module is provided with a filtering device to allow infrared light with the same wavelength as that of the infrared light transmitted by the infrared pulse transmitting module to pass through;
checking the difference between the reflected infrared intensity of the infrared light received by the infrared receiving module and the set background infrared intensity;
Responding to the fact that the reflected infrared intensity is higher than the set background infrared intensity, and when the difference value between the reflected infrared intensity and the set background infrared intensity reaches a set first threshold value, sending the difference value to the indoor host; and
The indoor host machine wakes up based on the difference value, responds to the difference value to control and increase the working frequency of the infrared pulse wave transmitting module and the infrared receiving module, determines the leaving or approaching of a visitor based on the change trend of the difference between the reflected infrared intensity of the infrared light and the set background infrared intensity, and judges the type of the visitor;
the indoor host responds to the fact that the difference value shows a gradually-decreasing trend and leaves the monitoring distance within a set first time length, the indoor host judges that the visitor leaves the monitoring distance to pass through the visitor, and the indoor host resets the infrared receiving module and the infrared pulse wave transmitting module to work at an initial working frequency and enter a dormant state;
The indoor host responds to the difference value and shows a gradually increasing trend, the doorbell operation is monitored within a set second time length, and the indoor host judges the visitor as a normal visitor;
And the indoor host responds to the trend that the difference value is gradually increased, and the doorbell operation is not monitored within the set second time length, so that the indoor host judges that the visitor is a suspicious visitor and controls the working frequency of the infrared pulse wave transmitting module and the infrared receiving module to be increased again.
2. The visitor identification method based on infrared radiation detection according to claim 1, wherein in the method, the infrared pulse wave transmitting module transmits infrared pulses at a set initial operating frequency when transmitting infrared pulses to the outside of the door, and the infrared receiving module and the infrared pulse wave transmitting module operate at the same frequency.
3. The method as claimed in claim 1, wherein the set background infrared intensity is an infrared intensity obtained by an infrared pulse wave emitting module emitting infrared pulses and an infrared receiving module receiving the infrared pulses when the door is clear.
4. a method as claimed in claim 1, wherein the method further comprises the steps of:
the indoor host enters suspicious visitor processing and controls and starts to acquire images and/or images outside the door.
5. a method as claimed in claim 1, wherein the method further comprises the steps of:
In response to a tendency that a difference between the aforementioned reflected infrared intensity and a set background infrared intensity shows a gradual increase, and: 1) the visitor does not leave the monitoring distance within a set third time length, and the doorbell operation is not detected; or 2) judging that the visitor is too close to the doorbell according to the difference, and enabling the indoor host to enter the high-risk visitor to process the visitor.
6. A method as claimed in claim 1, wherein the method further comprises the steps of:
And adjusting the size of the initial working frequency to adjust the infrared radiation detection range.
7. a visitor identification system based on infrared radiation detection is characterized by comprising an outdoor unit arranged on the outer side of a door and an indoor host arranged on the inner side of the door, wherein:
the outdoor unit is provided with an infrared pulse wave transmitting module for transmitting infrared pulses at an initial working frequency and an infrared receiving module for receiving the infrared pulses to detect infrared intensity, and the infrared receiving module is provided with a filtering device which is set to only allow infrared light with the same wavelength as that of the infrared light transmitted by the infrared pulse wave transmitting module to pass through; the infrared receiving module and the infrared pulse wave transmitting module work at the same frequency at the same time;
the outdoor unit is further configured to send a first response signal to the indoor host computer when a difference value between the reflected infrared intensity of the infrared light received by the infrared receiving module and a set background infrared intensity reaches a set first threshold value;
The indoor host wakes up when receiving the first response signal and controls and increases the working frequency of the infrared pulse wave transmitting module and the infrared receiving module;
The indoor host is further configured to show a gradually decreasing trend based on a difference value between the reflected infrared intensity of the infrared light received by the infrared receiving module and a set background infrared intensity, and when the visitor leaves the monitoring distance within a set first time length, the visitor is judged to leave and the infrared receiving module and the infrared pulse wave emitting module are reset to work at an initial working frequency, and the indoor host enters a sleep state;
The indoor host is further configured to show a gradually increasing trend based on a difference value between the reflected infrared intensity and a set background infrared intensity, and when the doorbell operation is not monitored within a set second time period, determine that the visitor is a suspicious visitor and control to increase the operating frequency of the infrared pulse wave transmitting module and the infrared receiving module again.
8. The visitor identification system based on infrared radiation detection as claimed in claim 7, wherein the indoor host further controls to start the image capturing device installed outside the door to capture still images and/or videos outside the door when the visitor is determined as a suspicious visitor.
9. An infrared radiation detection based visitor identification system according to claim 7 wherein the indoor host computer is further arranged to exhibit a gradual increase trend based on the difference between the aforementioned reflected infrared intensity and a set background infrared intensity, and: 1) when the visitor does not leave the monitoring distance within the set third time length and does not detect the doorbell operation; or 2) when judging that the visitor is too close to the doorbell according to the difference value, entering high-risk visitor processing, wherein the method comprises at least one of the following operations: and sending out sound and/or light alarm information, sending the alarm information to a set contact person and sending the alarm information to a public alarm platform.
10. an infrared radiation detection based visitor identification system according to any one of claims 7-9 wherein the indoor host computer is provided with means for adjusting the initial operating frequency of the infrared receiving means and the infrared pulse wave emitting means.
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| CN108615282A (en) * | 2018-04-12 | 2018-10-02 | 广东汇泰龙科技有限公司 | A kind of radio visual doorbell control method and system based on face lock |
| CN110290348A (en) * | 2019-06-13 | 2019-09-27 | 浙江大华技术股份有限公司 | A kind of smart electronics opal and its awakening method, device |
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