CN107360351A - Network monitoring apparatus and its defogging method - Google Patents
Network monitoring apparatus and its defogging method Download PDFInfo
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- CN107360351A CN107360351A CN201710545489.4A CN201710545489A CN107360351A CN 107360351 A CN107360351 A CN 107360351A CN 201710545489 A CN201710545489 A CN 201710545489A CN 107360351 A CN107360351 A CN 107360351A
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- image
- temperature
- monitoring apparatus
- network monitoring
- sharpness
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/55—Details of cameras or camera bodies; Accessories therefor with provision for heating or cooling, e.g. in aircraft
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The present invention provides a kind of network monitoring apparatus and its defogging method.It can judge whether to control heater to be heated according to the image sharpness for obtaining image, to remove the fog inside network monitoring apparatus, avoid the acquisition image of network monitoring apparatus from ambiguous situation occur, and monitoring quality can be significantly increased.
Description
Technical field
The present invention relates to a kind of supervising device, more particularly to a kind of network monitoring apparatus and its defogging method.
Background technology
In recent years, flourishing with internet, the lasting reduction with photographic element unit price, network monitoring apparatus (example
Such as, network camera (Internet Protocol camera, IP camera)), largely use various place (such as
Company, factory, save from damage at home), to carry out remotely inspecting.A part of network monitoring apparatus is arranged at open air, therefore its
Inside is usually the space of sealing and has water-proof function, to adapt to more harsh environment.So at low ambient temperatures, network prison
Control device often causes internal moisture condensation into fog, will so cause network monitoring apparatus institute because interior temperature distribution is uneven
There is ambiguous situation in the image of acquisition, and can not effectively play due monitoring function.
The content of the invention
The present invention provides a kind of network monitoring apparatus and its defogging method, effectively can remove to go out inside network monitoring apparatus
Existing fog.
The network monitoring apparatus of the present invention includes image acquiring device, heater and control circuit.Image obtains dress
Acquisition image can be produced by putting.Image acquiring device includes image processor, can calculate the sharpness for obtaining image.Control electricity
Road couples image acquiring device and heater, and energy Enough judges whether that control is described according to the image sharpness for obtaining image and added
Thermal is heated.
The present invention also provides a kind of defogging method of network monitoring apparatus, and network monitoring apparatus includes heater.Network
The defogging method of supervising device comprises at least the following steps.Produced using network monitoring apparatus and obtain image.Calculate and obtain image
Sharpness.Judge whether to control the heater to be heated according to the image sharpness for obtaining image.
Based on above-mentioned, embodiments of the invention energy Enough judges whether to control heater according to the image sharpness for obtaining shadow
Heated, to remove the fog inside network monitoring apparatus, avoid the acquisition image appearance of network monitoring apparatus smudgy
Situation, and monitoring quality can be significantly increased.
For features described above of the invention and advantage can be become apparent, special embodiment below, and it is detailed to coordinate accompanying drawing to make
Carefully it is described as follows.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of network monitoring apparatus according to embodiments of the invention；
Fig. 2 is a kind of schematic diagram of network monitoring apparatus according to another embodiment of the present invention；
Fig. 3 A are a kind of waveform diagrams of luminance signal according to embodiments of the invention；
Fig. 3 B are a kind of waveform diagrams of chroma signals according to embodiments of the invention；
Fig. 4 is the brightness of pixel and the signal of chroma of a kind of calculating acquisition image according to embodiments of the invention
Figure；
Fig. 5 is a kind of schematic diagram of heater according to embodiments of the invention；
Fig. 6 is the schematic diagram of the heater according to another embodiment of the present invention；
Fig. 7 is the schematic diagram of the heater according to another embodiment of the present invention；
Fig. 8 is the schematic diagram of the heater according to another embodiment of the present invention；
Fig. 9 is the schematic diagram of the heater according to another embodiment of the present invention；
Figure 10 is a kind of flow chart of the defogging method of network monitoring apparatus according to the embodiment of the present invention；
Figure 11 is a kind of flow chart of the defogging method of network monitoring apparatus according to another embodiment of the present invention.
Description of reference numerals：
100：Network monitoring apparatus
102：Image acquiring device
104、600、700、800、900：Heater；
106：Control circuit
108：Image processor
502：Heat transistor unit；
504：Temperature sensing unit；
506：Driver element；
702：Sluggish unit；
704：Feedback unit；
802：Start unit；
902：OR gate；
A1：Comparator；
NTC1、NTC2：Negative tempperature coefficient thermistor；
Q1：NPN bipolar transistors；
Q2~Q5：PNP bipolar transistors；
R1、R2、R3、R4、R5：Resistance；
VCC：Operating voltage；
Vref1、Vref2：Reference voltage；
M1：Metal-oxide half field effect transistor；
S1：Enabling signal；
C1：Photo-sensitive cell；
L1：Camera lens；
B1：Substrate；
P1：Pixel；
SD1：First side；
SD2：Second side；
SA：Moisture detector；
SB：Temperature sensor；
S1002~S1006, S1102~S1104：The defogging method step of network monitoring apparatus.
Embodiment
Fig. 1 is a kind of schematic diagram of network monitoring apparatus according to embodiments of the invention, refer to Fig. 1.Network monitoring
Device 100 may be, for example, network camera, and it includes image acquiring device 102, heater 104 and control circuit 106, its
Middle control circuit 106 couples image acquiring device 102 and heater 104.Image acquiring device 102 can be for example including camera lens
(being not depicted in Fig. 1), photo-sensitive cell (being not depicted in Fig. 1), image processor 108 ... etc., it can be used to obtain external image,
Image/video is obtained to produce, in part embodiment, photo-sensitive cell can be incorporated into single-chip with image processor 108, so
It is not limited.Control circuit 106 can be for example including processor, and it for example can be implemented with chip, be so not limited.Control
Circuit 106 according to the image sharpness for obtaining image to judge whether to control heater 104 to be heated, to change network
The uneven situation of Temperature Distribution inside supervising device 100, and can remove the mist that the inside of network monitoring apparatus 100 occurs
Gas.Wherein, heater 104 may be, for example, to be heated using transistor, so be not limited.
Fig. 2 is a kind of schematic diagram of network monitoring apparatus according to another embodiment of the present invention, refer to Fig. 2.In this reality
Apply in example, network monitoring apparatus 100 have closed inner space (classification of waterproof of network monitoring apparatus 100 can for example higher than
IP44, such as IP55, IP67 etc.), image acquiring device 102 includes the one of camera lens L1 and photo-sensitive cell C1, wherein camera lens L1
Side can be exposed to the outside of network monitoring apparatus 100, and opposite side is then located at the inner space of network monitoring apparatus 100.In addition,
Photo-sensitive cell C1 is arranged on the substrate B1 inside network monitoring apparatus 100 with heater 104, and positioned at substrate B1 close to mirror
Head L1 the first side SD1, and control circuit 106 is then arranged on substrate B1 backwards to camera lens L1 the second side SD2.As shown in Fig. 2
Network monitoring apparatus 100 is separated as two spaces by substrate B1, because general networking supervising device 100 is to tend to miniaturization
Product, therefore inner space is not likely to produce thermal convection current.Consequently, it is possible to when control circuit 106 operates, its caused heat is not easy
It is transferred to positioned at the first side SD1 space, therefore causes the interior space temperature skewness of network monitoring apparatus 100, now
Just easily produce fog in the moisture condensation in network monitoring apparatus 100, if be condensed on camera lens L1 or photo-sensitive cell C1 or
On light path between the two, there is ambiguous situation in the image that photo-sensitive cell may be caused to be sensed.Control circuit 106
Can for example judge the acquired image of image acquiring device 102 image sharpness whether across (across) give tacit consent to sharpness, example
If the image sharpness for obtaining image is higher than from script becomes lower than acquiescence sharpness, represent in network monitoring apparatus 100
Fog is produced, the controllable heater 104 on the SD1 of the first sides of substrate B1 of control circuit 106 is heated, to balance base
The temperature in plate B1 both sides space, and then the fog of network monitoring apparatus 100 is removed, make network monitoring apparatus 100 be easier to haze
In the environment of can also be normally carried out monitoring.
In some embodiments, control circuit 106 also can determine whether the current image sharpness for obtaining image and previous judgement
Whether the difference of the image sharpness of the acquisition image gone out is more than acquiescence difference, such as control circuit 106 can determine whether when different
Between put obtain image between image sharpness difference whether be more than acquiescence difference, to be continuously monitored by network monitoring apparatus
Whether the situation that hazes is had inside 100.When the image sharpness and the previous acquisition image judged that currently obtain image
The difference of image sharpness when being more than acquiescence difference, the just situation that hazes may be represented, therefore the control of control circuit 106 adds
Thermal 104 is heated.
Specifically, image processor 108 judges to obtain the mode of the image sharpness of image, is, for example, according to acquisition figure
The brightness of picture and colourity judges, that is, luminance signal (Y) and chroma signals obtained from obtaining image according to separation
(Cb/Cr) judge.It is respectively actual brightness (Y) and chroma (C) signal for S-Video, shown in Fig. 3 A and Fig. 3 B
Example.For example, when the situation that the inside of network monitoring apparatus 100 hazes, accessed by image acquiring device 102
Image will occur that picture is partially greyish white and there is the block of same brightness and chroma to become changeable big situation, network monitoring apparatus
100 can be according to the luminance signal and the value of chroma signals and numerical value for the previous period obtained on image corresponding to each pixel
Compare, to determine whether that picture is partially greyish white and there is the block of same brightness and chroma to become changeable big situation, and then can sentence
Whether the image sharpness for acquisition image that breaks has the situation of decline.Wherein, as Fig. 4 calculate obtain image pixel brightness with
And shown in the schematic diagram of chroma, network monitoring apparatus 100 obtains on image each pixel P1 brightness and during chroma calculating,
Can by zigzag (zigzag) scan in a manner of come calculate obtain image on each pixel brightness and chroma (so not as
Limit).If some adjacent blocks have similar brightness and chroma numerical value (compared with for the previous period), it is possible to learn and start to haze
.
In addition, in some embodiments, network monitoring apparatus 100 is also optionally included with moisture detector and temperature
For sensor at least first, for example in Fig. 2 embodiments, network monitoring apparatus 100 may include that moisture detector SA and temperature pass
Sensor SB, it is respectively coupled to control circuit 106, and respectively detecting the humidity of network monitoring apparatus 100 and temperature.Control circuit
106 can determine whether the humidity detected by moisture detector SA is sensed higher than acquiescence humidity, and temperature sensor SB
Temperature whether be less than default temperature, and using it in the lump as the foundation for judging whether to control heater 104 to be heated.Example
As can be in obtaining the image sharpness of image less than acquiescence sharpness, the humidity detected by moisture detector higher than acquiescence humidity
And the temperature that is sensed of temperature sensor less than three kinds of situations such as default temperature at least one occurs when, control heater
104 are heated, to avoid the inside of network monitoring apparatus 100 from producing fog.
In other embodiments, as shown in figure 5, heater 104 can be for example including heating transistor unit 502, temperature
Sensing unit 504 and driver element 506, the coupling of driver element 506 heating transistor unit 502 and temperature sensing unit 504.
Wherein temperature sensing unit 504 senses voltage, and driver element 506 to sensing temperature according to sensing result output temperature
Then heated to heat transistor unit 502 according to the driving of temperature sensing voltage.In addition, control circuit 106 also can be direct
Control heating transistor unit 502 is heated.Wherein heat transistor unit 502 for example can be come in fact with bipolar transistor
Apply, such as PNP bipolar transistors, thus by heating transistor unit 502 come replace heating plate (heater board) as
Production cost can be greatly reduced in heating element heater, and reduces layout (layout) space of printed circuit board (PCB).
Fig. 6 is the schematic diagram of the heater according to another embodiment of the present invention, refer to Fig. 6.Specifically, it is above-mentioned to add
The embodiment of hot transistor unit 502, temperature sensing unit 504 and driver element 506 can be as shown in fig. 6, implement in Fig. 6
In the heater 600 of example, temperature sensing unit 504 is to be implemented with negative tempperature coefficient thermistor NTC1, and it is coupled to drive
Between moving cell 506 and ground connection.Driver element 506 includes NPN bipolar transistors Q1, resistance R1 and electricity in the present embodiment
Resistance R2, wherein resistance R1 and resistance R2 are series between operating voltage VCC and NPN bipolar transistor Q1 base stage, and electricity
R1 and resistance R2 common joint coupling NPN bipolar transistors Q1 collector is hindered, NPN bipolar transistors Q1 emitter-base bandgap grading is then
It is coupled to ground connection.In addition, heating transistor unit 502 includes being serially connected between operating voltage VCC and ground connection in the present embodiment
Three PNP bipolar transistor Q2~Q4, wherein PNP bipolar transistors Q2 base stage coupling NPN bipolar transistors Q1
Collector, PNP bipolar transistors Q2, Q3 base stage, which connect, is respectively coupled to its collector.
When environment temperature is lower, negative tempperature coefficient thermistor NTC1 resistance value will be bigger, negative temperature coefficient heat-sensitive
Voltage on resistance NTC1 is also bigger.Pass through appropriately designed resistance R1, resistance R2 and negative tempperature coefficient thermistor NTC1
Resistance value, the voltage on negative tempperature coefficient thermistor NTC1 can be led in environment temperature as little as default value (such as -40 DEG C)
Logical NPN bipolar transistor Q1, and NPN bipolar transistors Q1 base voltage is improved, and then drag down PNP bipolar transistors
Q2 base voltage, conducting PNP bipolar transistors Q2~Q4.PNP bipolar transistors Q2~Q4 switched on can start to produce
Heat, to improve printed circuit board (pcb board) temperature.As PNP bipolar transistors Q2~Q4 improves pcb board temperature gradually,
Negative tempperature coefficient thermistor NTC1 resistance value and NPN bipolar transistors Q1 base voltage also slowly decline, finally
So that NPN bipolar transistors Q1 is closed, and then related closing PNP bipolar transistor Q2~Q4, to avoid the heat time
It is long and cause temperature too high or waste unnecessary power supply.In addition, control circuit 106 can also couple PNP bipolar transistors
Q2 base stage, when heater 600 to be controlled is heated, PNP bipolar transistors Q2 base voltage can be directly dragged down,
To turn on PNP bipolar transistor Q2~Q4, PNP bipolar transistors Q2~Q4 is set to start to produce heat.
The heating transistor unit 502 of the present embodiment includes three PNP bipolar transistor Q2~Q4, and it can be respectively configured
In the position that different needs heat, to improve heating effect.Such as when heater 600 is applied on the electronic device, can
PNP bipolar transistors Q2~Q4 is respectively configured to the position of element poor to low temperature tolerant degree in electronic installation, with true
Protecting electronic installation normally can start shooting or operate.Further, since the PNP bipolar transistors as heating element heater can be coupled directly
To ground connection (such as PNP bipolar transistor Q4), the PNP bipolar transistors of heating element heater can be by ground path by thermal energy conduction
To PCB ground planes, it is more effectively carried out heating.
Fig. 7 is the schematic diagram of the heater according to another embodiment of the present invention, refer to Fig. 7.Heating compared to Fig. 5
Device 104, can also include sluggish unit 702 in the heater 700 of the present embodiment, its be coupled to temperature sensing unit 504 with
Between driver element 506.Sluggish unit 702 can be used to the electricity for the temperature sensing voltage that delay temperature sensing unit 504 is exported
Voltage level switching time, during avoiding temperature from being swung near the critical-temperature of enable driver element 506, driver element 506 according to
Continually switch its state according to temperature sensing voltage.Sluggish unit 702 can be for example when temperature rises to the first temperature according to temperature
Degree sensing voltage output first voltage and enable driver element 506, and according to temperature sensing when temperature drops to second temperature
Voltage output second voltage and forbidden energy driver element 506, wherein the first temperature is higher than second temperature.
For example, the temperature sensing unit 504 of the present embodiment can be for example including negative coefficient thermistors NTC2 and electricity
R3 is hindered, wherein negative coefficient thermistors NTC2 one end coupling operating voltage VCC, resistance R3 are then coupled to negative coefficient thermistors
Between the NTC2 other end and ground connection.Sluggish unit 702 may include comparator A1 and feedback unit 704, and comparator A1 is just
Input couples reference voltage Vref 1, negative input end coupling negative coefficient thermistors NTC2 and resistance R3 common joint, feedback
Unit 704 is then coupled between comparator A1 output end and positive input terminal, and it is in the output end according to comparator A1
Voltage produces feedback voltage to comparator A1 positive input terminal.Feedback unit 704 is to be implemented with resistance R4 in the present embodiment.
Driver element 506 includes metal-oxide half field effect transistor M1 in the present embodiment, and it is coupled to heating transistor unit
Between 502 and ground connection, metal-oxide half field effect transistor M1 grid is then coupled to comparator A1 output end.In addition, the present embodiment
Heating transistor unit 502 include PNP bipolar transistor Q5, its emitter-base bandgap grading coupling operating voltage VCC, PNP bipolar transistor
Pipe Q5 collector coupling ground connection, PNP bipolar transistors Q5 base stage then couple metal-oxide half field effect transistor M1 drain electrode.
In the present embodiment, environment temperature is lower, and negative tempperature coefficient thermistor NTC2 resistance value is bigger, and causes ratio
The voltage of negative input end compared with device A1 is smaller.When the voltage of comparator A1 negative input end is less than the reference voltage of positive input terminal
During Vref1, comparator A1 turns on output HIGH voltage metal-oxide half field effect transistor M1.The metal-oxide half field effect transistor M1 of conducting
PNP bipolar transistors Q5 base voltage can be dragged down, and turns on PNP bipolar transistor Q5, makes PNP bipolar transistors Q5
Start to produce heat, and then improve pcb board temperature.And as PNP bipolar transistors Q5 improves temperature, negative temperature coefficient heat gradually
Quick resistance NTC2 resistance value will slowly decline so that the voltage of comparator A1 negative input end slowly becomes big.As comparator A1
The voltage of negative input end when being more than the reference voltage Vref 1 of positive input terminal, comparator A1 output voltage switch to low-voltage and
So that metal-oxide half field effect transistor M1 is closed, and then closes PNP bipolar transistor Q5, it is set to stop heating.
It is worth noting that, in the present embodiment, comparator A1 output voltage is fed back to by positive input by resistance R4
End can postpone metal-oxide half field effect transistor M1 and be switched on and pent time.Such as temperature on pcb board can be made to drop to 6 DEG C
When just open metal-oxide half field effect transistor M1, begin to warm up PNP bipolar transistors Q5, and when temperature rises to 22 DEG C
Metal-oxide half field effect transistor M1 is closed, PNP bipolar transistors Q5 is stopped heating.Wherein metal-oxide half field effect transistor M1 is prolonged
The time for turning on and being delayed by late closing can be adjusted according to actual demand by changing resistance R4 resistance value.
In addition, from above-described embodiment, driver element 506 is not as microcontroller or CPU etc. are complicated
Circuit is implemented, higher to the tolerance level of low temperature, so can ensure that still can normally carry out under the environment of extremely low temperature it is accurate
Computer heating control.In addition, control circuit 106 can also couple PNP bipolar transistors Q5 base stage, when heater 700 to be controlled
When being heated, PNP bipolar transistors Q5 base voltage can be directly dragged down, to turn on PNP bipolar transistor Q5, is made
PNP bipolar transistors Q5 starts to produce heat.
Fig. 8 is the schematic diagram of the heater according to another embodiment of the present invention, refer to Fig. 8.As described above, heating dress
Put and can be applicable on electronic installation, namely heater can also have the function of starting electronic installation, it can ensure that electronic installation
Normally it can start shooting or operate at low ambient temperatures.As in the present embodiment, heater 800 can be used to export enabling signal
S1, to start the elements such as the chip in electronic installation, CPU or microprocessor, electronic installation may be, for example, network
Supervising device 100, also may be, for example, computer, display ... etc..As shown in figure 8, the heater 800 of the present embodiment is except figure
Outside 5 heater 104, in addition to start unit 802, it couples temperature sensing unit 504, and start unit 802 can be in pcb board
When upper temperature rises to default temperature, foundation temperature sensing voltage output enabling signal S1 (such as export to control circuit 106,
To start control circuit 106).
Furthermore, it is understood that before to ensure that temperature not yet rises to default temperature in pcb board, start unit 802 will not be defeated
Go out enabling signal S1 and start electronic installation, the embodiment of heater can be as shown in Figure 9.In fig.9, heater 900 wraps
Include start unit 802 and the heater 700 such as Fig. 7.Start unit 802 can be implemented in the present embodiment with OR gate 902, or
The first input end coupling negative tempperature coefficient thermistor NTC2 and resistance R3 of door 902 common joint, the second of OR gate 902 are defeated
Enter end then to couple the output end of OR gate 902 and receive the reference voltage Vref 2 in logic low, reference voltage Vref 2 can
Such as by the way that the second input of OR gate 902 is couple into ground connection to provide by resistance R5.Cause when environment temperature is too low
Voltage (namely temperature sensing voltage) on negative tempperature coefficient thermistor NTC2 and resistance R3 common joint is in logic low
During level, the output of OR gate 902 is also logic low, and and now start unit 802 does not export enabling signal S1 yet.
On the other hand, heater 700 then proceed by heating and so that temperature is begun to ramp up, negative temperature coefficient thermistor power
The voltage on NTC2 and resistance R3 common joint is hindered also therefore with rising.When negative tempperature coefficient thermistor NTC2 and resistance
(now pcb board temperature just rises to default temperature), OR gate 902 when voltage on R3 common joint rises to logic high
It is changed to export the voltage of logic high potential, namely now start unit 802 just exports enabling signal S1, wherein start unit 802
Corresponding temperature for example can be set by changing resistance R3 resistance value when exporting enabling signal S1.So according to temperature
Voltage is sensed to decide whether to start, you can ensure before temperature not yet rises to default temperature, start unit 802 will not export
Enabling signal S1 starts electronic installation, and then avoids electronic installation from being activated in low temperature and cause electronic device startup or running
It is abnormal.
It is worth noting that, the second input of OR gate 902 mutually couples with output end in the present embodiment, therefore work as OR gate
After the voltage of 902 output logic high potentials (namely after output enabling signal S1), the voltage of the second input of OR gate 902 also can
Switch to logic high potential.Consequently, it is possible to no matter how the voltage on the first input end of OR gate 902 changes afterwards, no matter namely ring
How border temperature changes, and the voltage that OR gate 902 exports can all be maintained at logic high potential.That is, in electronic installation in quilt
After startup, heater 900 will not close electronic installation because later environment temperature declines, and can be continuously kept electronics
The starting state of device.In other embodiments, in electronic installation after being activated, if being intended to set makes heater 900 in ring
Border temperature stops output enabling signal S1, the second input and the output of removable OR gate 902 when dropping below default temperature
Coupling relation between end.
Figure 10 is a kind of flow chart of the defogging method of network monitoring apparatus according to the embodiment of the present invention, refer to figure
10.From above-described embodiment, the defogging method of network monitoring apparatus can comprise at least the following steps.First, supervised using network
Control device and produce acquisition image (step S1002), then, calculate the sharpness (step S1004) for capturing image.Last foundation again
The image sharpness for obtaining image judges whether to control heater to be heated (step S1006).Wherein step S1006 reality
The mode of applying refers to be described above.
Figure 11 is a kind of flow chart of the defogging method of network monitoring apparatus according to another embodiment of the present invention, be refer to
Figure 11.In the present embodiment, the defogging method of network monitoring apparatus further include detection humidity and temperature at least one (step
Rapid S1102), and according to image sharpness, detected humidity and the temperature at least one sensed for obtaining image
Judge whether to control heater to be heated (step S1104).Wherein when the image sharpness for obtaining image is sharp less than giving tacit consent to
Humidity detected by sharp degree, moisture detector is higher than the temperature that acquiescence humidity and temperature sensor are sensed less than acquiescence
When at least one occurs, controllable refrigerating/heating apparatus is heated three kinds of situations such as temperature, to avoid producing inside network monitoring apparatus
Fog gas.
In summary, embodiments of the invention judge whether to control heater to be heated according to image is obtained, with
The fog inside network monitoring apparatus is removed, avoids the acquisition image of network monitoring apparatus from ambiguous situation occur, and can
Monitoring quality is significantly increased.In some embodiments, heater can also be by driver element come according to temperature sensing voltage
Driving heating transistor unit is heated, and makes start unit when temperature rises to default temperature, according to temperature sensing voltage
Enabling signal is exported, enabling signal startup network monitoring dress can be normally sent to ensure heater under the environment of extremely low temperature
Put.In addition, carry out heating the production cost that can reduce heater using transistor unit is heated, furthermore, due to as heating
The heating transistor unit of element can be by PCB ground planes by thermal energy conduction to other elements, compared to conventional heating plate only
It is able to can be more effectively carried out heating by printed circuit board (PCB) heat conduction.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent
The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to
The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered
Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology
The scope of scheme.
Claims (11)
- A kind of 1. network monitoring apparatus, it is characterised in that including：Image acquiring device, can produce an acquisition image, and described image acquisition device includes：Image processor, the sharpness of the acquisition image can be calculated；Heater；AndControl circuit, described image acquisition device and the heater are coupled, can images of the Enough according to the acquisition image Sharpness judges whether to control the heater to be heated.
- 2. network monitoring apparatus according to claim 1, it is characterised in that the control circuit energy Enough judges current obtain Whether the difference of the image sharpness of image and the image sharpness of the previous acquisition image judged is more than an acquiescence difference, and It is big in the difference of the current image sharpness for obtaining image and the image sharpness of the previous acquisition image judged The heater is controlled to be heated when the acquiescence difference.
- 3. network monitoring apparatus according to claim 1, it is characterised in that also include：Moisture detector, couples the control circuit, the control circuit can also Enough in the image sharpness of the acquisition image During less than the humidity detected by an acquiescence sharpness and the moisture detector higher than an acquiescence humidity, the heating dress is controlled Put and heated.
- 4. network monitoring apparatus according to claim 1, it is characterised in that also include：Temperature sensor, couples the control circuit, the control circuit can also Enough in the image sharpness of the acquisition image When the temperature sensed less than an acquiescence sharpness and the temperature sensor is less than a default temperature, the heating dress is controlled Put and heated.
- 5. network monitoring apparatus according to claim 1, it is characterised in that waterproof of wherein described network monitoring apparatus etc. Level is higher than IP44, and the heater includes：Heat transistor unit；Temperature sensing unit, energy Enough senses an environment temperature, and exports a temperature sensing voltage according to this；AndDriver element, the control circuit, the heating transistor unit and the temperature sensing unit are coupled, can Enough foundations institute State the temperature sensing voltage driving heating transistor unit to be heated, the control circuit can also the Enough controls heating crystalline substance Body pipe unit is heated.
- 6. network monitoring apparatus according to claim 5, it is characterised in that the heater also includes：Start unit, the temperature sensing unit is coupled, energy Enough is when printed circuit plate temperature rises to a default temperature, foundation The enabling signal of temperature sensing voltage output one, to start the network monitoring apparatus.
- 7. network monitoring apparatus according to claim 5, it is characterised in that the heater also includes：Sluggish unit, it is coupled between the temperature sensing unit and the driver element, can the Enough delays temperature sensing electricity The voltage level switching time of pressure, wherein the sluggish unit energy Enough is when temperature rises to first temperature on a printed circuit board The driver element described in enable according to the first voltage of temperature sensing voltage output one, and energy Enough drops to one second in temperature According to the second voltage of temperature sensing voltage output one, driver element described in forbidden energy, first temperature are higher than institute during temperature State second temperature.
- 8. a kind of defogging method of network monitoring apparatus, it is characterised in that the network monitoring apparatus includes a heater, institute Stating the defogging method of network monitoring apparatus includes：One, which is produced, using the network monitoring apparatus obtains image；Calculate the sharpness of the acquisition image；AndImage sharpness according to the acquisition image judges whether to control the heater to be heated.
- 9. the defogging method of network monitoring apparatus according to claim 8, it is characterised in that including：Whether the difference of the image sharpness of the current image sharpness for obtaining image of judgement and the previous acquisition image judged More than an acquiescence difference, when the image of the current image sharpness for obtaining image and the previous acquisition image judged When the difference of sharpness is more than the acquiescence difference, the heater is controlled to be heated.
- 10. the defogging method of network monitoring apparatus according to claim 8, it is characterised in that including：Detect humidity；AndHumidity is given tacit consent to higher than one beyond an acquiescence sharpness and detected humidity in the image sharpness of the acquisition image When, control the heater to be heated.
- 11. the defogging method of network monitoring apparatus according to claim 8, it is characterised in that including：Sensing temperature；AndIt is less than a default temperature in the temperature that the image sharpness of the acquisition image is given tacit consent to sharpness beyond one and sensed When, control the heater to be heated.
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| CN201710545489.4A CN107360351A (en) | 2017-07-06 | 2017-07-06 | Network monitoring apparatus and its defogging method |
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| CN201710545489.4A CN107360351A (en) | 2017-07-06 | 2017-07-06 | Network monitoring apparatus and its defogging method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112954142A (en) * | 2019-11-22 | 2021-06-11 | 宝山钢铁股份有限公司 | Intelligent dust-removing defogging camera protective cover and intelligent identification method thereof |
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Application publication date: 20171117 |