CN107526235B - Method and device for preventing front cover of camera lens from fogging and camera - Google Patents
Method and device for preventing front cover of camera lens from fogging and camera Download PDFInfo
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- CN107526235B CN107526235B CN201610452104.5A CN201610452104A CN107526235B CN 107526235 B CN107526235 B CN 107526235B CN 201610452104 A CN201610452104 A CN 201610452104A CN 107526235 B CN107526235 B CN 107526235B
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- 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
Abstract
The embodiment of the invention provides a method and a device for preventing a front cover of a camera lens from fogging and a camera, wherein the method comprises the following steps: acquiring a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of a front cover of a lens of the camera; calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value; judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value; if yes, the fan is started to blow cold air in the camera to reduce the first temperature value, and then the first dew point value is reduced until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so that the lens front cover is prevented from being fogged. In the invention, when the second temperature value of the front cover of the camera lens is greater than the first dew point value, the first temperature value is reduced, so that the first dew point value is reduced, the second temperature value is far greater than the first dew point value, and the front cover of the camera lens is prevented from fogging.
Description
Technical Field
The invention relates to the technical field of security monitoring, in particular to a method and a device for preventing a front cover of a camera lens from fogging and a camera.
Background
At present, the camera has more applications in the security monitoring field, and the humiture of camera accessible temperature and humidity sensor detection camera internal environment, but temperature and humidity sensor mainly used camera internal temperature monitoring is so that report to the police when camera internal temperature is too high or low at present in the camera, for example: when the temperature and humidity sensor detects that the temperature inside the camera is low, the CPU can turn on a corresponding heating device inside the camera to improve the temperature inside the camera in order to ensure that the camera can work normally.
However, if the external environment where the camera is located is suddenly cooled, such as sudden downfall and heavy rain, the outdoor temperature is rapidly reduced, so that the temperature difference between the inside and the outside of the front cover of the camera is large, and the temperature and humidity environment inside the camera meets the cold front cover of the camera lens, fog is formed on the front cover of the camera lens, and the use of the camera is affected. At present, no corresponding method for preventing fogging of the front cover of the camera lens exists.
Disclosure of Invention
The invention aims to provide a method and a device for preventing a front cover of a camera lens from fogging and a camera, so as to prevent the front cover of the camera lens from fogging. The specific technical scheme is as follows:
a method of preventing fogging of a camera lens bezel, the method comprising:
acquiring a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of a front cover of a lens of the camera;
calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value;
judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value;
if yes, starting a fan to blow cold air in the camera to reduce the first temperature value, and further reducing the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value.
Optionally, the method further includes:
and when the second temperature value is greater than the sum of the first dew point value and the second temperature threshold value, starting a heating sheet to heat the interior of the camera to raise the first temperature value, and further raising the second temperature value until the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value, so as to prevent the lens front cover from fogging, wherein the third temperature threshold value is a positive value.
Optionally, the method further includes:
and when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, increasing the collection frequency for collecting the first temperature value, the first humidity value and the second temperature value to a first frequency.
Optionally, the method further includes:
and when the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value, reducing the collection frequency of collecting the first temperature value, the first humidity value and the second temperature value to a second frequency.
Optionally, the calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value includes:
calculating a first dew value of the camera internal environment according to the following formula:
wherein the content of the first and second substances,
Tdis a first dew point value, a and b are constants, T is a first temperature value, RH is a first humidity value, and γ is a dew point coefficient.
An apparatus for preventing fogging of a camera lens bezel, the apparatus comprising:
the acquisition module is used for acquiring a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of a front cover of a camera lens;
the calculation module is used for calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value;
the judging module is used for judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value, and if so, the first starting module is triggered;
the first starting module is used for starting the fan to blow cold air in the camera to reduce the first temperature value and further reduce the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value.
Optionally, the apparatus further comprises:
and the second starting module is used for starting a heating sheet to heat the interior of the camera to raise the first temperature value when the second temperature value is greater than the sum of the first dew value and the second temperature threshold value, and further raising the second temperature value until the second temperature value is greater than the sum of the first dew value and a third temperature threshold value, so as to prevent the lens front cover from fogging, wherein the third temperature threshold value is a positive value.
Optionally, the apparatus further comprises:
and the increasing module is used for increasing the acquisition frequency for acquiring the first temperature value, the first humidity value and the second temperature value to a first frequency when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value.
Optionally, the apparatus further comprises:
and the reducing module is used for reducing the collecting frequency of the first temperature value, the first humidity value and the second temperature value to a second frequency when the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value.
Optionally, the calculation module is specifically configured to:
calculating a first dew value of the camera internal environment according to the following formula:
wherein the content of the first and second substances,
Tdis a first dew point value, a and b are constants, T is a first temperature value, RH is a first humidity value, and γ is a dew point coefficient.
A camera, comprising: the temperature sensor is in contact with a lens front cover of the camera, and the temperature and humidity sensor, the controller and the fan are all arranged inside the camera;
the temperature and humidity sensor is used for acquiring a first temperature value of the internal environment of the camera and a first humidity value of the internal environment of the camera;
the temperature sensor is used for acquiring a second temperature value of the front cover of the camera lens;
the controller is used for calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value; judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value; if yes, starting a fan to blow cold air in the camera to reduce the first temperature value, and further reducing the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value;
the fan is used for blowing cold air inside the camera.
Optionally, the camera further includes: a heating plate disposed inside the camera;
the controller is specifically configured to, when the second temperature value is greater than a sum of the first dew point value and the second temperature threshold value, start a heating sheet to heat the inside of the camera to raise the first temperature value, and then raise the second temperature value until the second temperature value is greater than a sum of the first dew point value and a third temperature threshold value, so as to prevent the lens front cover from fogging, where the third temperature threshold value is a positive value.
The heating plate is used for heating the interior of the camera.
Optionally, the controller is specifically configured to increase an acquisition frequency of acquiring the first temperature value, the first humidity value, and the second temperature value to a first frequency when a difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value.
Optionally, the controller is specifically configured to reduce, to a second frequency, an acquisition frequency of acquiring the first temperature value, the first humidity value, and the second temperature value when the second temperature value is greater than a sum of the first dew point value and a third temperature threshold value.
In the embodiment of the invention, a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of the front cover of the camera lens are collected, a first dew point value of the internal environment of the camera is calculated according to the first temperature value and the first humidity value, when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, a fan is started to blow cold air in the camera to reduce the first temperature value, and further reduce the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so that the first temperature value is reduced when the second temperature value of the front cover of the camera lens is larger than the first dew point value, the second temperature value is far larger than the first dew point value, and the front cover of the camera lens is prevented from being fogged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first flowchart of a method for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention;
FIG. 2 is a second flowchart illustrating a method for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention;
FIG. 3 is a third flowchart illustrating a method for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention;
FIG. 4 is a fourth flowchart illustrating a method for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first structure of an apparatus for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention;
FIG. 6 is a second structural diagram of the device for preventing fogging of the front cover of the camera lens according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of a third structure of the device for preventing fogging of the front cover of the camera lens according to the embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating a fourth structure of an apparatus for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention;
fig. 9 is a first structural diagram of a camera according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a second structure of the video camera according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to solve the problem of the prior art, the embodiment of the invention provides a method and a device for preventing a front cover of a camera lens from fogging, and a camera.
First, a method for preventing fogging of a front cover of a camera lens according to an embodiment of the present invention will be described.
It should be noted that the method for preventing fogging of the front cover of the camera lens provided in the embodiment of the present invention is applied to a camera, and particularly to a Controller of the camera, where the Controller may be based on a single chip, a P L C (Programmable L organic Controller), a DSP (digital signal processor), or other Programmable Controller platforms, and the control logic may be implemented by different programming languages and software.
As shown in fig. 1, an embodiment of the present invention provides a method for preventing fogging of a front cover of a camera lens, including:
s101: the method comprises the steps of collecting a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of a front cover of a lens of the camera.
Because one side of the camera lens front cover is in contact with the external environment, and the other side of the camera lens front cover is in contact with the internal environment of the camera, when the external environment where the camera is located is suddenly cooled, the temperature difference between the inside and the outside of the camera lens front cover is large, and the temperature and humidity environment inside the camera meets the camera lens front cover with the temperature reduced, and fog can be formed on the camera lens front cover.
Therefore, the fogging of the camera lens front cover is related to the temperature and humidity value inside the camera and the temperature value of the camera lens front cover (i.e. the external environment temperature value), and therefore, in order to prevent the fogging of the camera lens front cover, a first temperature value of the camera internal environment, a first humidity value of the camera internal environment, and a second temperature value of the camera lens front cover need to be collected.
Wherein, the temperature value both can be gathered through temperature sensor, can gather through temperature and humidity sensor again, and is corresponding, and the humidity value can be gathered through humidity transducer, also can gather through temperature and humidity sensor, and this application does not prescribe a limit to this.
In an implementation manner of the invention, when the temperature and humidity sensor is used for acquiring the first temperature value of the internal environment of the camera and the first humidity value of the internal environment of the camera, the temperature and humidity sensor can be close to the lens front cover of the camera but cannot contact the lens front cover and is far away from other heating elements in the camera, so that the influence of the other heating elements on the acquired temperature and humidity value is avoided, and the temperature and humidity value acquired by the temperature and humidity sensor is ensured to be the temperature and humidity value of the air near the lens front cover of the camera.
In addition, through independent temperature sensor and independent humidity transducer, when measuring camera internal environment's first temperature and first humidity respectively, independent temperature sensor and independent humidity transducer's the position of setting can be similar with above-mentioned temperature and humidity transducer, and it is no longer repeated here.
In an implementation manner of the present invention, when the second temperature value of the lens front cover of the camera is collected by the temperature sensor, the temperature sensor can be in contact with the lens front cover of the camera because the temperature of the lens front cover is to be collected, when the external environment of the camera is not cooled, the internal environment temperature of the camera is balanced with the external environment temperature, the second temperature value collected by the temperature sensor is the external environment temperature value, when the external environment of the camera is cooled, the lens front cover is cooled along with the second temperature value, and the second temperature value collected by the temperature sensor is the temperature of the cooled lens front cover.
S102: a first dew value of the camera internal environment is calculated based on the first temperature value and the first humidity value.
The dew point value is a temperature value to which gaseous water contained in air needs to be reduced when the gaseous water is saturated and condensed into liquid water under fixed air pressure, so that when the temperature value of the camera lens front cover reaches the dew point value, fog can be formed on the camera lens front cover by the camera lens front cover when the temperature and humidity environment in the camera meets the dew point value.
Therefore, after obtaining the first temperature value of the internal environment of the camera, the first humidity value of the internal environment of the camera and the second temperature value of the front cover of the lens of the camera, the first dew point value of the internal environment of the camera is calculated according to the first temperature value and the first humidity value.
Specifically, calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value may include:
calculating a first dew value of the camera internal environment according to the following formula:
wherein the content of the first and second substances,
Tdis a first dew point value, a and b are constants, T is a first temperature value, RH is a first humidity value, and γ is a dew point coefficient.
Specifically, a may be 17.27 ℃ and b may be 237.7 ℃.
S103: and judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, and if so, executing the step S104.
Wherein the first temperature threshold is a positive value.
When the second temperature value of the camera lens front cover is reduced to the first dew point value, fog is formed on the camera lens front cover.
For example: the first temperature value of the internal environment of the camera is 25 ℃, the first humidity value is 50%, the first dew point value is calculated to be 14.8 ℃, and then the lens front cover can be fogged when the second temperature value of the lens front cover is 14.8 ℃.
Therefore, in order to prevent the camera lens front cover from fogging, measures are taken when the second temperature value is not reduced to the first dew point value, the difference between the second temperature value and the first dew point value is judged to be smaller than a first temperature threshold value, and if so, the subsequent steps are performed, wherein the first temperature threshold value can be set to be smaller, and particularly, the first temperature threshold value can be 5 ℃ in order to reduce the power consumption of the camera.
S104: and starting the fan to blow cold air in the camera to reduce the first temperature value and further reduce the first dew point value until the second temperature value is greater than the sum of the first dew point value and a second temperature threshold value so as to prevent the lens front cover from fogging.
Wherein the second temperature threshold is a positive value.
And when the second temperature value is smaller than the sum of the first dew point value and the first temperature threshold value, starting a fan arranged in the camera, blowing cold air in the camera, circulating air inside and outside the camera, and further reducing the temperature in the camera.
For example: the first dew point value is 14.8 ℃, the first temperature threshold value is 5 ℃, and when the second temperature value is between 14.8 ℃ and 19.8 ℃, the fan is started to blow cold air inside the camera.
The camera has the advantages that cold air is blown inside the camera, the first temperature value is rapidly reduced, the first dew point value is further reduced until the second temperature value is larger than the sum of the first dew point value and the second temperature threshold value, at the moment, the second temperature value is far larger than the first dew point value, the fogging of the front cover of the lens is prevented, different second temperature threshold values can be set according to different camera structures and heat dissipation conditions, and the second temperature threshold values can be 7 ℃.
In the embodiment of the invention, a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of the front cover of the camera lens are collected, a first dew point value of the internal environment of the camera is calculated according to the first temperature value and the first humidity value, when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, a fan is started to blow cold air in the camera to reduce the first temperature value, and further reduce the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so that the first temperature value is reduced when the second temperature value of the front cover of the camera lens is larger than the first dew point value, the second temperature value is far larger than the first dew point value, and the front cover of the camera lens is prevented from being fogged.
The method shown in fig. 1 is described in detail below with a specific embodiment:
for example: acquiring a first temperature value of the internal environment of the camera as 25 ℃, a first humidity value as 50%, a second temperature value of the front cover of the camera lens as 16 ℃, a first temperature threshold as 5 ℃ and a second temperature threshold as 7 ℃;
calculating a first dew point value of the internal environment of the camera to be 14.8 ℃ according to the first temperature value and the first humidity value;
the temperature of the camera is controlled to be 16-14.8 ℃. < 5 ℃, the fan is started to blow cold air in the camera to reduce the first temperature value, and then the first dew point value is reduced until the second temperature value is larger than the sum of the first dew point value and the second temperature threshold value, namely, the fan is started to blow cold air in the camera until the temperature is 16 ℃. > the first dew point value plus 7 ℃, namely, the first dew point value is smaller than 9 ℃ (16 ℃ -7 ℃), so that fogging of the front cover of.
On the basis of the embodiment shown in fig. 1, as shown in fig. 2, an embodiment of the present invention provides a method for preventing fogging of a front cover of a camera lens, where the method may further include:
s105: and when the second temperature value is greater than the sum of the first dew point value and the second temperature threshold value, starting the heating sheet to heat the interior of the camera to raise the first temperature value, and further raising the second temperature value until the second temperature value is greater than the sum of the first dew point value and the third temperature threshold value, so as to prevent the lens front cover from fogging.
Wherein the third temperature threshold is a positive value.
When the second temperature value is greater than the sum of the first dew point value and the second temperature threshold value, the heating sheet is started to heat the interior of the camera, the fan is closed at the moment, and air circulation inside and outside the camera is reduced, so that the first temperature value in the interior of the camera is rapidly increased, and the temperature of the front lens cover is also rapidly increased due to air circulation inside the equipment, at the moment, the second temperature value collected by the temperature sensor is the temperature of the front lens cover after the temperature is increased, so that the second temperature value is increased while the first temperature value is increased until the second temperature value is greater than the sum of the first dew point value and the third temperature threshold value, at the moment, the second temperature value is far greater than the first dew point value, so that the possibility of generating fog on the front lens cover of the camera is extremely low, and the front lens cover is prevented from being fogged, wherein in order that the second temperature value is far greater than the first dew point value, the third temperature threshold, different third temperature thresholds can be set according to different camera structures and heat dissipation conditions, and specifically, the third temperature threshold can be 20 ℃.
Therefore, when the second temperature value is larger than the sum of the first dew point value and the second temperature threshold value, the first temperature value is increased by starting the heating sheet to heat the interior of the camera until the second temperature value is larger than the sum of the first dew point value and the third temperature threshold value, so that the second temperature value is far larger than the first dew point value, the possibility that the front cover of the camera lens generates fog is extremely low, and the front cover of the camera lens is further prevented from fogging.
The method shown in fig. 2 is described in detail below with a specific embodiment:
for example: acquiring a first temperature value of the internal environment of the camera as 25 ℃, a first humidity value as 50%, a second temperature value of the front cover of the camera lens as 16 ℃, a first temperature threshold as 5 ℃, a second temperature threshold as 7 ℃ and a third temperature threshold as 20 ℃;
calculating a first dew point value of the internal environment of the camera to be 14.8 ℃ according to the first temperature value and the first humidity value;
as the temperature of 16-14.8 ℃ ═ 1.2 ℃ < 5 ℃, the fan is started to blow cold air inside the camera to reduce the first temperature value, and further reduce the first dew point value until the second temperature value is greater than the sum of the first dew point value and the second temperature threshold value, namely, the fan is started to blow cold air inside the camera until the temperature of 16 ℃ > the first dew point value +7 ℃, namely, until the first dew point value is less than 9 ℃ (16 ℃ -7 ℃), for example, the first dew point value is 8 ℃, so as to prevent the front lens cover from fogging;
at the moment, the heating plate is started to heat the interior of the camera to raise the first temperature value and further raise the second temperature value until the second temperature value is larger than the sum of the first dew point value and the third temperature threshold value, namely, the heating plate is started to heat the interior of the camera until the second temperature value is larger than 8 ℃ and the temperature is larger than 20 ℃ and is equal to 28 ℃, so that the fogging of the front lens cover is further prevented.
On the basis of the embodiment shown in fig. 2, as shown in fig. 3, an embodiment of the present invention provides a method for preventing fogging of a front cover of a camera lens, where the method may further include:
s106: and when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, increasing the collection frequency of collecting the first temperature value, the first humidity value and the second temperature value to a first frequency.
When gathering first temperature value, first humidity value and second temperature value, in order to reduce the consumption of camera, can set up the collection frequency as once per minute, after second temperature value and first dew point value difference are less than first temperature threshold value, in order to open the fan rapidly, can improve the collection frequency of gathering first temperature value, first humidity value and second temperature value and once per second.
Owing to improved the acquisition frequency, the fan is at the inside in-process that blows cold air and reduce first temperature value of camera, and the inside first temperature of camera after the change can be learnt comparatively fast to the controller of camera, and then can calculate the first dew point value after the change according to the first temperature value after the change, and the controller of camera just so can be greater than at the second temperature value first dew point value has in time closed the fan when the sum of second temperature threshold value, further reduces the energy consumption of camera.
The principle of timely opening and closing the fan is the same, due to the fact that the collecting frequency is improved, after the fan is closed, the heating plate is opened, and the heating plate is timely closed under the condition that corresponding conditions are met, and therefore the purpose of better preventing the front cover of the camera lens from being fogged is achieved.
Therefore, the front cover of the camera lens is prevented from being fogged better in a mode of improving the acquisition frequency.
On the basis of the embodiment shown in fig. 3, as shown in fig. 4, the method for preventing the camera lens front cover from fogging according to the embodiment of the present invention may further include:
s107: and when the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value, reducing the collection frequency of collecting the first temperature value, the first humidity value and the second temperature value to a second frequency.
After the camera lens front cover is prevented from fogging, it is reasonable to reduce the acquisition frequency to once every minute or once every five minutes in order to reduce the power consumption of the camera at this time.
Therefore, when the second temperature value is larger than the sum of the first dew value and the third temperature threshold value, the power consumption of the camera is reduced and the service life of the camera is prolonged by reducing the acquisition frequency.
With respect to the above method embodiment, an embodiment of the present invention further provides an apparatus for preventing fogging of a front cover of a camera lens, as shown in fig. 5, the apparatus may include:
the acquisition module 201 is configured to acquire a first temperature value of an internal environment of the camera, a first humidity value of the internal environment of the camera, and a second temperature value of a front cover of a lens of the camera;
a calculating module 202, configured to calculate a first dew point value of an internal environment of the camera according to the first temperature value and the first humidity value;
a determining module 203, configured to determine whether a difference between the second temperature value and the first dew point value is smaller than a first temperature threshold, where the first temperature threshold is a positive value, and if so, trigger a first starting module 204;
the first starting module 204 is configured to start a fan to blow cold air inside the camera to reduce the first temperature value, and further reduce the first dew point value until the second temperature value is greater than a sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, where the second temperature threshold value is a positive value.
In the embodiment of the invention, a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of the front cover of the camera lens are collected, a first dew point value of the internal environment of the camera is calculated according to the first temperature value and the first humidity value, when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, a fan is started to blow cold air in the camera to reduce the first temperature value, and further reduce the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so that the first temperature value is reduced when the second temperature value of the front cover of the camera lens is larger than the first dew point value, the second temperature value is far larger than the first dew point value, and the front cover of the camera lens is prevented from being fogged.
Specifically, the calculating module 202 may be specifically configured to:
calculating a first dew value of the camera internal environment according to the following formula:
wherein the content of the first and second substances,
Tdis a first dew point value, a and b are constants, T is a first temperature value, RH is a first humidity value, and γ is a dew point coefficient.
On the basis of the embodiment shown in fig. 5, as shown in fig. 6, the apparatus for preventing fogging of the front cover of the camera lens according to the embodiment of the present invention may further include:
a second starting module 205, configured to, when the second temperature value is greater than a sum of the first dew point value and the second temperature threshold, start a heating sheet to heat the inside of the camera to raise the first temperature value, and then raise the second temperature value until the second temperature value is greater than the sum of the first dew point value and a third temperature threshold, so as to prevent the lens front cover from fogging, where the third temperature threshold is a positive value.
Therefore, when the second temperature value is larger than the sum of the first dew point value and the second temperature threshold value, the first temperature value is increased by starting the heating sheet to heat the interior of the camera until the second temperature value is larger than the sum of the first dew point value and the third temperature threshold value, so that the second temperature value is far larger than the first dew point value, the possibility that the front cover of the camera lens generates fog is extremely low, and the front cover of the camera lens is further prevented from fogging.
On the basis of the embodiment shown in fig. 6, as shown in fig. 7, the apparatus for preventing fogging of the front cover of the camera lens according to the embodiment of the present invention may further include:
the increasing module 206 is configured to increase the acquiring frequency of acquiring the first temperature value, the first humidity value, and the second temperature value to a first frequency when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold.
Therefore, the front cover of the camera lens is prevented from being fogged better in a mode of improving the acquisition frequency.
On the basis of the embodiment shown in fig. 7, as shown in fig. 8, the apparatus for preventing fogging of the front cover of the camera lens according to the embodiment of the present invention may further include:
and a reducing module 207, configured to reduce, to a second frequency, an acquisition frequency of acquiring the first temperature value, the first humidity value, and the second temperature value when the second temperature value is greater than a sum of the first dew point value and a third temperature threshold value.
Therefore, when the second temperature value is larger than the sum of the first dew value and the third temperature threshold value, the power consumption of the camera is reduced and the service life of the camera is prolonged by reducing the acquisition frequency.
Further, as shown in fig. 9, an embodiment of the present invention further provides a camera, which may include: the camera comprises a temperature sensor 91, a temperature and humidity sensor 92, a controller 93 and a fan 94, wherein the temperature sensor 91 is in contact with a lens front cover of the camera, and the temperature and humidity sensor 92, the controller 93 and the fan 94 are all arranged inside the camera;
the temperature and humidity sensor 92 is used for acquiring a first temperature value of the internal environment of the camera and a first humidity value of the internal environment of the camera;
the temperature sensor 91 is used for acquiring a second temperature value of the front cover of the camera lens;
the controller 93 is configured to calculate a first dew point value of an internal environment of the camera according to the first temperature value and the first humidity value; judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value; if yes, starting a fan to blow cold air in the camera to reduce the first temperature value, and further reducing the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value;
the fan 94 is used for blowing cold air inside the camera.
Because temperature and humidity sensor is used for gathering the first temperature value of camera internal environment and the first humidity value of camera internal environment, therefore temperature and humidity sensor can be close to the camera lens protecgulum of camera, but can not contact the camera lens protecgulum to keep away from other heating element of camera inside, avoid other heating element to produce the influence to the humiture value of gathering, in order to guarantee that the humiture value that temperature and humidity sensor gathered is the humiture value of near camera lens protecgulum air promptly.
From this, through the optimal design of distance control and avoidance heat source, the difference between the humiture value that temperature and humidity sensor gathered and the near real temperature and humidity value of the near air of camera lens protecgulum is less, for example: the error of temperature value is +/-1 deg.C, and the error of humidity value is +/-3%, so that the error of calculated dew point value is within +/-5 deg.C.
Because temperature sensor is used for gathering the second temperature value of camera lens protecgulum, consequently can contact temperature sensor and the camera lens protecgulum of camera, when the external environment that the camera was located is not cooled down, camera internal environment temperature and external environment temperature balance, the second temperature value that temperature sensor gathered is external environment temperature value, when the external environment that the camera was located is cooled down, the camera lens protecgulum is cooled down thereupon, the second temperature value that temperature sensor gathered is the temperature of the camera lens protecgulum after the cooling down.
Therefore, a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of the front cover of the camera lens are collected through the controller, a first dew point value of the internal environment of the camera is calculated according to the first temperature value and the first humidity value, when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, the fan is started to blow cold air in the camera to reduce the first temperature value, the first dew point value is further reduced until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, therefore, the first temperature value is reduced when the second temperature value of the front cover of the camera lens is larger than the first dew point value, the first dew point value is reduced, the second temperature value is far larger than the first dew point value, and fogging of the front cover of the camera lens is avoided.
On the basis of the embodiment shown in fig. 9, as shown in fig. 10, the camera provided in the embodiment of the present invention may further include: a heating sheet 95 disposed inside the camera;
the controller 93 is specifically configured to, when the second temperature value is greater than a sum of the first dew point value and the second temperature threshold value, start a heating sheet to heat the inside of the camera to raise the first temperature value, and then raise the second temperature value until the second temperature value is greater than a sum of the first dew point value and a third temperature threshold value, so as to prevent the lens front cover from fogging, where the third temperature threshold value is a positive value.
The heating plate 95 is used for heating the inside of the camera.
Therefore, when the second temperature value is larger than the sum of the first dew point value and the second temperature threshold value, the controller starts the heating sheet to heat the interior of the camera, the first temperature value is increased, and then the second temperature value is increased until the second temperature value is larger than the sum of the first dew point value and the third temperature threshold value, so that the second temperature value is far larger than the first dew point value, the possibility that the front cover of the camera lens generates fog is extremely low, and the front cover of the camera lens is further prevented from fogging.
The controller 93 may be specifically configured to increase the collection frequency for collecting the first temperature value, the first humidity value, and the second temperature value to a first frequency when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value.
The controller 93 may be specifically configured to reduce the collection frequency for collecting the first temperature value, the first humidity value, and the second temperature value to a second frequency when the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (11)
1. A method of preventing fogging of a camera lens bezel, the method comprising:
acquiring a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of a front cover of a lens of the camera;
calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value;
judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value;
if yes, starting a fan to blow cold air in the camera to reduce the first temperature value, and further reducing the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value;
and when the second temperature value is greater than the sum of the first dew point value and the second temperature threshold value, starting a heating sheet to heat the interior of the camera to raise the first temperature value, and further raising the second temperature value until the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value, so as to prevent the lens front cover from fogging, wherein the third temperature threshold value is a positive value.
2. The method of claim 1, further comprising:
and when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, increasing the collection frequency for collecting the first temperature value, the first humidity value and the second temperature value to a first frequency.
3. The method of claim 2, further comprising:
and when the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value, reducing the collection frequency of collecting the first temperature value, the first humidity value and the second temperature value to a second frequency.
4. The method of claim 1, wherein calculating a first dew point value of a camera internal environment from the first temperature value and the first humidity value comprises:
calculating a first dew value of the camera internal environment according to the following formula:
wherein the content of the first and second substances,
Tdis a first dew point value, a and b are constants, T is a first temperature value, RH is a first humidity value, and γ is a dew point coefficient.
5. An apparatus for preventing fogging of a camera lens bezel, the apparatus comprising:
the acquisition module is used for acquiring a first temperature value of the internal environment of the camera, a first humidity value of the internal environment of the camera and a second temperature value of a front cover of a camera lens;
the calculation module is used for calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value;
the judging module is used for judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value, and if so, the first starting module is triggered;
the first starting module is used for starting a fan to blow cold air in the camera to reduce the first temperature value and further reduce the first dew point value until the second temperature value is greater than the sum of the first dew point value and a second temperature threshold value so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value;
and the second starting module is used for starting a heating sheet to heat the interior of the camera to raise the first temperature value when the second temperature value is greater than the sum of the first dew value and the second temperature threshold value, and further raising the second temperature value until the second temperature value is greater than the sum of the first dew value and a third temperature threshold value, so as to prevent the lens front cover from fogging, wherein the third temperature threshold value is a positive value.
6. The apparatus of claim 5, further comprising:
and the increasing module is used for increasing the acquisition frequency for acquiring the first temperature value, the first humidity value and the second temperature value to a first frequency when the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value.
7. The apparatus of claim 6, further comprising:
and the reducing module is used for reducing the collecting frequency of the first temperature value, the first humidity value and the second temperature value to a second frequency when the second temperature value is greater than the sum of the first dew point value and a third temperature threshold value.
8. The apparatus of claim 5, wherein the computing module is specifically configured to:
calculating a first dew value of the camera internal environment according to the following formula:
wherein the content of the first and second substances,
Tdis a first dew point value, a and b are constants, T is a first temperature value, RH is a first humidity value, and γ is a dew point coefficient.
9. A camera, comprising: the temperature sensor is in contact with a lens front cover of the camera, and the temperature and humidity sensor, the controller, the fan and the heating plate are all arranged inside the camera;
the temperature and humidity sensor is used for acquiring a first temperature value of the internal environment of the camera and a first humidity value of the internal environment of the camera;
the temperature sensor is used for acquiring a second temperature value of the front cover of the camera lens;
the controller is used for calculating a first dew point value of the internal environment of the camera according to the first temperature value and the first humidity value; judging whether the difference between the second temperature value and the first dew point value is smaller than a first temperature threshold value, wherein the first temperature threshold value is a positive value; if yes, starting a fan to blow cold air in the camera to reduce the first temperature value, and further reducing the first dew point value until the second temperature value is larger than the sum of the first dew point value and a second temperature threshold value, so as to prevent the lens front cover from fogging, wherein the second temperature threshold value is a positive value;
the fan is used for blowing cold air inside the camera;
the controller is specifically configured to, when the second temperature value is greater than a sum of the first dew point value and the second temperature threshold value, start a heating sheet to heat the inside of the camera to raise the first temperature value, and then raise the second temperature value until the second temperature value is greater than a sum of the first dew point value and a third temperature threshold value, so as to prevent the lens front cover from fogging, where the third temperature threshold value is a positive value;
the heating plate is used for heating the interior of the camera.
10. The camera of claim 9, wherein the controller is configured to increase the frequency of acquiring the first temperature value, the first humidity value, and the second temperature value to a first frequency when the difference between the second temperature value and the first dew point value is less than a first temperature threshold.
11. The camera of claim 10, wherein the controller is configured to decrease the frequency of acquiring the first temperature value, the first humidity value, and the second temperature value to a second frequency when the second temperature value is greater than a sum of the first dew point value and a third temperature threshold value.
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| CN110248060A (en) * | 2019-06-13 | 2019-09-17 | 惠州市德赛西威汽车电子股份有限公司 | A kind of method and camera module for preventing cam lens from hazing |
| CN113438389B (en) * | 2020-03-23 | 2022-08-23 | 浙江宇视科技有限公司 | Anti-fog method, anti-fog device, camera device and storage medium |
| CN111299879B (en) * | 2020-05-13 | 2020-10-23 | 佛山市宏石激光技术有限公司 | Anti-condensation method for laser head |
| CN111787195B (en) * | 2020-06-12 | 2021-08-31 | 西华师范大学 | Camera equipment capable of preventing lens fogging in cold weather |
| CN114326112A (en) * | 2020-09-30 | 2022-04-12 | 华为技术有限公司 | Anti-fog head-mounted display device and anti-fog method |
| CN113179363B (en) * | 2021-04-23 | 2023-04-07 | 重庆市海普软件产业有限公司 | Defogging device, surveillance camera with defogging device and defogging method |
| CN113467545A (en) * | 2021-07-26 | 2021-10-01 | 联想(北京)有限公司 | Control method and electronic device |
| CN113645383B (en) * | 2021-07-29 | 2022-07-22 | 深圳市芯成像科技有限公司 | Defogging method and system for lens and camera |
| CN116170667B (en) * | 2023-04-25 | 2023-07-04 | 深圳世国科技股份有限公司 | Automatic temperature control method and device for intelligent explosion-proof shield camera |
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