CN220359389U - Defrosting and defogging circuit, camera and combined system with image processing function - Google Patents

Abstract

The utility model provides a defrosting and demisting circuit of a camera, which comprises the following components: the device comprises a first sensing circuit, a second sensing circuit, a control circuit and a heating circuit. The control circuit comprises a first input end, a second input end and an output end; the first sensing circuit is electrically connected with the first input end; the second input end is electrically connected with the second induction circuit; the heating circuit is electrically connected with the output end of the control circuit. The technical scheme of the utility model effectively solves the problem of inaccurate defrosting and demisting of the camera module, and optimizes the cleaning effect. In addition, the utility model also provides a camera and a combined system with an image processing function applying the camera.

Description

Defrosting and defogging circuit, camera and combined system with image processing function

Technical Field

The utility model relates to the technical field of cameras, in particular to a defrosting and defogging circuit, a camera and a combined system with an image processing function.

Background

With the vigorous development of industries such as smart cities, automobiles and the like, the functions and the number of cameras are greatly improved. However, in some special weather, some outdoor lenses of the camera module may frost and mist, which prevent normal use and present a great potential safety hazard.

Most of the existing defrosting and defogging cameras are used for structurally removing water and defogging, for example, a mounting defogging ring sleeve is embedded at the front end of a camera body lens, and the control is inaccurate and the cleaning effect is poor.

Disclosure of Invention

The utility model provides a defrosting and defogging circuit, a camera and a combined system with an image processing function, which realize that a lens is accurately heated under the condition of frosting and defogging of the lens so as to achieve a better cleaning effect.

In a first aspect, an embodiment of the present utility model provides a defrosting and defogging circuit for a camera. The defrosting and defogging circuit of the camera comprises a first sensing circuit, a second sensing circuit, a heating circuit and a control circuit, wherein the control circuit comprises an input end and an output end, and the first sensing circuit and the second sensing circuit are electrically connected with the input end of the control circuit; the heating circuit is electrically connected with the output end of the control circuit; the first sensing circuit is used for detecting whether the image of the camera is abnormal or not and outputting a first electric signal to the control circuit according to a detection result; the second sensing circuit outputs a second electric signal to the control circuit according to the temperature change of the camera, wherein the second electric signal comprises a first level signal or a second level signal; the control circuit generates a third electric signal according to the first electric signal and the second electric signal to control the heating circuit to be started or closed so as to heat or stop heating the camera.

Preferably, the first induction circuit comprises a pin arranged on the serial port adding unit, and the pin is electrically connected with the control circuit; the serial port adding unit outputs a first electric signal at the pin through the control of the feedback unit when the image of the camera is abnormal.

Preferably, the second sensing circuit further comprises a voltage comparator U1, and a first voltage dividing circuit and a second voltage dividing circuit connected in parallel, wherein the resistance value of the first voltage dividing circuit changes along with the temperature of the camera; the comparator comprises a first input pin, a second input pin and an output pin, wherein the first input pin is electrically connected with the first voltage dividing circuit, the second input pin is electrically connected with the second voltage dividing circuit, and the output pin is electrically connected with the control circuit.

Preferably, the first voltage dividing circuit comprises a thermistor and a first resistor connected in series, and the second voltage dividing circuit comprises a second resistor and a third resistor connected in series; the first input pin is electrically connected between the thermistor and the first resistor, and the second input pin is electrically connected between the second resistor and the third resistor.

Preferably, the heating circuit comprises an electronic switching device and an electric heating element, the electronic switching device is electrically connected with the output end of the control circuit, and the electronic switching device controls the electric heating element to work or stop working according to the third electric signal.

Preferably, the electronic switching device comprises a field effect transistor, wherein the field effect transistor comprises a source electrode, a grid electrode and a drain electrode; the grid electrode is electrically connected with the output end of the control circuit, and the drain electrode is electrically connected with the electric heating element; when the third level output by the control circuit is the first level, the electronic switching device is turned on, and the electric heating element starts to work; when the third level output by the control circuit is the second level, the electronic switching device is turned off, and the electric heating element stops working.

Preferably, the control circuit comprises a logic gate circuit, the input terminal of the control circuit is an input pin of the logic gate, and the output terminal of the control circuit is an output pin of the logic gate.

Preferably, the defrosting and defogging circuit of the camera further comprises a power circuit, wherein the power circuit is used for providing electric energy for the defrosting and defogging circuit of the camera, and the power circuit is electrically connected with a main power supply of a main device for installing the camera; when the main device is started, the main power supply supplies power to the power supply circuit.

In a second aspect, an embodiment of the present utility model provides a camera, where the camera uses the defrosting and defogging circuit of the camera.

In a third aspect, an embodiment of the present utility model provides a combination system with an image processing function, where the combination system includes the above-mentioned camera and a host device to which the above-mentioned camera is applied.

Above-mentioned defrosting defogging circuit, camera and the master equipment of camera, through first induction circuit, second induction circuit double-circuit synchronous control heating circuit work, reach more accurate heating effect, in addition, adopt the mains operated, more energy saving.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a functional schematic diagram of a defrosting and demisting circuit module of a camera according to an embodiment of the present utility model.

Fig. 2 is a schematic circuit diagram of a defrosting and defogging circuit for a camera according to an embodiment of the present utility model.

Fig. 3 is a schematic diagram of connection between a camera and a main device according to an embodiment of the present utility model.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances, or in other words, the described embodiments may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, may also include other items, such as processes, methods, systems, articles, or apparatus that include a series of steps or elements, are not necessarily limited to only those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such processes, methods, articles, or apparatus.

It should be noted that the description of "first", "second", etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implying an indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

Please refer to fig. 3 in combination, which is a schematic diagram illustrating connection between a camera and a main device according to an embodiment of the present utility model. In this embodiment, the camera 1 is communicatively connected to the main device 2 for remote monitoring, object recognition, data acquisition, and the like. The host device 2 may be, but is not limited to, a vehicle, a barrier gate, a remote monitoring server, a drone, an industrial personal computer, or the like. The camera 1 can be arranged on the main equipment or can be separated from the main equipment 2, and only needs to keep communication connection. Further, the camera 1 and the main apparatus 2 can be regarded as a combined system having an image processing function. The camera 1 includes an imaging assembly (not shown) composed of a lens, an image sensor, and the like. It will be appreciated that the images captured by the camera 1 need to be transmitted to the host device 2 and processed by the host device 2 for remote monitoring, object recognition, data acquisition, etc. Specifically, the master device 2 includes a processor 21 (not shown). The camera 1 is communicatively connected to the processor 21, and is configured to receive an image captured by the camera 1.

Referring to fig. 1 in combination, a functional block diagram of a defrosting and defogging circuit of a camera according to an embodiment of the utility model is shown. In the present embodiment, the processor 21 is further configured to detect an image captured by the camera 1, so as to detect whether an abnormality occurs in the image captured by the camera 1. When an image shot by the camera 1 is abnormal, an image detection result of the abnormal image is fed back to the camera 1. In the present embodiment, whether or not the image captured by the camera 1 is abnormal includes blurred imaging caused by frosting and fogging of the camera when the camera 1 is suddenly cooled or heated by a low-temperature environment. The processor 21 is configured to detect whether the image captured by the camera 1 is abnormal or not by using an existing image detection algorithm, for example, an image deep learning algorithm, an image comparison algorithm, and the like, which are not listed here. Further, the camera 1 is in communication connection with the processor 21 through the serial port adding unit 201, specifically, the camera performs serial processing on the photographed image and sends the processed image to the processor 21. The processor 21 receives the image, performs deserialization, performs image detection, and sends the image detection result to the add-serial port unit 201.

The defrosting and defogging circuit 100 of the camera 1 is applied to the camera and is used for defrosting and defogging a lens, keeping the lens clean and further enabling the camera 1 to obtain a clearer image. The defrosting and defogging circuit 100 of the camera 1 includes a first sensing circuit 200, a second sensing circuit 300, a control circuit 400, and a heating circuit 500. In this embodiment, the first sensing circuit 200, the second sensing circuit 300, and the heating circuit 500 are all electrically connected to the control circuit 400. In this embodiment, the first sensing circuit is used for detecting whether the image of the camera is abnormal, the second sensing circuit is used for detecting the temperature abnormality of the camera, and the control circuit 400 is used for controlling the heating circuit 500 to heat the camera according to the detection results of the first sensing circuit 200 and the second sensing circuit 300.

Referring to fig. 2 in combination, a schematic circuit diagram of a defrosting and defogging circuit for a camera according to an embodiment of the utility model is shown.

The first sensing circuit 200 is electrically connected to the control circuit 400, and is configured to output a first electrical signal when detecting that an abnormality occurs in an image captured by the camera 1. Specifically, the first sensing circuit 200 includes a serial port unit 201 and a pin 202 disposed on the serial port unit 201. The serial port adding unit 201 is used for transmitting imaging data of the camera and feeding back an image detection result. In this embodiment, the pin 202 is an idle general purpose pin (GPIO) disposed in the add-to-serial port unit 201. That is, the first sensing circuit 200 is constructed using the add-serial port unit 201. Specifically, a feedback unit 203 is added to the add-serial port unit 201, and an idle pin 202 in the add-serial port unit 201 is used as a pin controlled by the feedback unit 203, i.e. a pin as a feedback detection result. Further, the feedback unit 203 is obtained by adding a function of changing the output level of the control pin 202 under a certain condition to the add-drop unit 201. The change of the output level of the control pin 202 under a certain condition may be implemented by software or hardware, and may be implemented by using an existing technology, which is not described herein. More specifically, when the serial port adding unit 201 receives the image detection result fed back by the processor 21, the feedback unit 203 adjusts the output voltage of the pin 202 by a preset voltage value, thereby generating a first electrical signal. The pin 202 is electrically connected to the first input terminal a1 of the control circuit 400, and is configured to receive the image detection result output by the processor 21 and feed back a first electrical signal to the control circuit 400.

The second sensing circuit 300 is configured to output a second electrical signal when detecting that the camera temperature reaches the set temperature. The second sensing circuit 300 is electrically connected to the control circuit 400. Specifically, the second sensing circuit 300 includes a first voltage dividing circuit 301, a second voltage dividing circuit 302, and a comparator 303. The first voltage dividing circuit 301 and the second voltage dividing circuit 302 are electrically connected to the comparator 303, respectively, and in this embodiment, the first voltage dividing circuit 301 is connected in parallel to the second voltage dividing circuit 302. The plurality of resistors may constitute a first voltage dividing circuit 301 and a second voltage dividing circuit 302. The first voltage dividing circuit is used for sensing the temperature of the camera in real time and comprises a first resistor R1 and a thermistor Rt which are connected in series to generate corresponding first voltage signals; the second voltage dividing circuit 302 is configured to preset an abnormal temperature of frosting and hazing, and includes a second resistor R2 and a third resistor R3 connected in series, and generate a second voltage signal. The first voltage signal output by the first voltage dividing circuit 301 will change with the temperature change of the camera, and the second voltage signal output by the second voltage dividing circuit 302 will remain unchanged. Specifically, the comparator 303 may be a voltage comparator U1, including a first input pin b1, a second input pin b2, and an output pin b3. The comparator 303 feeds back a second electrical signal to the control circuit 400 for indicating whether the camera temperature is abnormal. The first input pin b1 is electrically connected between the first resistor R1 and the thermistor Rt, and is configured to receive the first voltage signal output by the first voltage divider 301. The second input pin b2 is electrically connected between the second resistor R2 and the third resistor R3, and is configured to receive the second voltage signal output by the second voltage dividing circuit 302. The comparator 303 outputs a second electrical signal according to a difference between the first voltage signal and the second voltage signal. The output pin b3 is electrically connected to the control circuit 400, and the second electrical signal is output to the control circuit 400 through the output pin b3. The second sensing circuit 300 may output a second electrical signal to the control circuit 400 to feedback whether the camera temperature is abnormal or not through different settings before R1, R2, R3, rt and the voltage comparator principle.

The control circuit 400 includes a first input terminal a1, a second input terminal a2, and an output terminal a3. Specifically, the control circuit 400 is, but not limited to, a logic and gate, and the first input terminal a1 is electrically connected to the GPIO interface 202 of the first sensing circuit 200, and is configured to receive the first electrical signal output by the add-drop unit 201 of the first sensing circuit 200. The second input terminal a2 is electrically connected to the output pin b3 of the voltage comparator U1 of the second sensing circuit 300, and is configured to receive the second electrical signal output by the comparator 303 of the second sensing circuit 300. The output terminal a3 is electrically connected to the electronic switching device 502 of the heating circuit 500, and is configured to output the first electrical signal, the second electrical signal, and the third electrical signal obtained after the logical phase of the first electrical signal and the second electrical signal to the heating circuit 500.

The heating circuit is configured to receive the third electrical signal generated by the control circuit 400 to control heating of the camera. The heating circuit 500 comprises an electric heating element 501, an electronic switching device 502, a fourth resistor R4. The electric heating element 501 is electrically connected with the electronic switching device 502 and is used for heating the camera to achieve the purposes of defrosting and demisting; the electronic switching device 502 is electrically connected with the output end a3 of the control circuit 400 and the electric heating element 501, and receives the third electric signal output by the control circuit 400; the fourth resistor is electrically connected with the electronic switching device and is used as reserved circuit protection. The electronic switching device 502 may be a field effect transistor Q1, where a gate G of the field effect transistor Q1 is electrically connected to an output terminal a3 of the logic and gate, and a drain D of the field effect transistor Q1 is electrically connected to the electric heating element 501. Specifically, field effect transistor Q1 includes, but is not limited to, an NMOS transistor.

The operation principle of the defrosting and demisting circuit 100 for the camera will be described in detail as follows:

the first electrical signal output by the GPIO pin 202 in the first sensing circuit 200 defaults to a low level, and when the image detection result fed back by the processor 21 is abnormal, the first electrical signal is adjusted to a high level and fed back to the control circuit 400. The second electric signal output by the comparator 303 in the second sensing circuit 300 defaults to a low level, when the temperature of the sensed camera reaches the preset abnormal temperature of frosting and fogging, the pressure difference between the first voltage dividing circuit 301 and the second voltage dividing circuit 302 increases, the second electric signal turns to a high level, and the abnormal temperature of the camera is fed back to the control circuit 400.

When the default output level of the third electric signal is low and the first electric signal and the second electric signal are both high, the output pin a3 of the logic and gate of the control circuit 400 will generate high level, that is, the third electric signal is also high, the electronic switching device 502 of the heating circuit 500 is turned on, and the electric heating element 501 starts to operate. When one of the first electrical signal and the second electrical signal is at a low level and the other is at a high level, the output third electrical signal is at a low level, and the heating circuit 500 does not operate; when both the first and second electrical signals are low, the third electrical signal is low, and the heating circuit 500 does not operate. Then, the electronic switching device 502 of the heating circuit 500 is turned on, and the electric heating element 501 starts to operate. Specifically, the electric heating element 501 includes, but is not limited to, a heating resistance wire T for heating the lens of the camera to achieve the defrosting and defogging effects.

In some possible embodiments, the manner in which the first sensing circuit 200 and the second sensing circuit 300 output the electrical signal to trigger the control circuit 400 is not limited thereto, and will not be described herein. In the first sensing circuit 200, the thermistor is mainly characterized by high sensitivity, high accuracy, economy, suitability for severe environments, and capability of measuring the temperature of the camera by using the resistance-temperature characteristic thereof, and can be placed near the camera, on the lens or around the lens, and no position limitation is made here.

The camera can be applied to scenes such as smart city construction, intelligent traffic systems, vehicles, unmanned aerial vehicles, industrial personal computers and the like, and is not listed here.

In the above embodiment, the first sensing circuit for detecting the image and the second sensing circuit for detecting the temperature determine whether to operate through the control circuit. When the temperature and the image are abnormal at the same time, the control circuit outputs an electric signal to enable the field effect tube to be conducted, and the electric heating unit starts to work so as to achieve the effects of defrosting and defogging of the camera. In addition, the first sensing circuit 200 can feed back to the outside whether the image shot by the camera is abnormal only by using the idle pin 202, and further, the defrosting and defogging circuit 100 of the camera can obtain whether the image shot by the camera is abnormal or not through the pin 202, that is, obtain a corresponding image detection result. That is, the defrosting and defogging circuit of the camera does not need to additionally add an image detection element to detect the image shot by the camera so as to obtain an image detection result. On the one hand, the structure of the defrosting and defogging circuit of the camera is simplified, and on the other hand, the first sensing circuit 200 is an image detection result obtained from the processor 21, so that the image detection result obtained by the defrosting and defogging circuit 100 of the camera is more accurate and quicker.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, if and when such modifications and variations of the present utility model fall within the scope of the claims and the equivalents thereof, the present utility model is intended to encompass such modifications and variations.

The above list of preferred embodiments of the present utility model is, of course, not intended to limit the scope of the utility model, and equivalent variations according to the claims of the present utility model are therefore included in the scope of the present utility model.

Claims (10)

1. The defrosting and defogging circuit of the camera is characterized by comprising a first sensing circuit, a second sensing circuit, a control circuit and a heating circuit; the control circuit comprises an input end and an output end, and the first sensing circuit and the second sensing circuit are electrically connected with the input end; the heating circuit is electrically connected with the output end of the control circuit; the first sensing circuit is used for detecting whether the image of the camera is abnormal or not and outputting a first electric signal to the control circuit according to a detection result; the second sensing circuit outputs a second electric signal to the control circuit according to the temperature change of the camera, wherein the second electric signal comprises a first level signal or a second level signal; and the control circuit generates a third electric signal according to the first electric signal and the second electric signal to control the heating circuit to be started or closed so as to heat or stop heating the camera.

2. The defrosting and defogging circuit of a camera of claim 1, wherein the camera is in communication connection with a main device of the camera, the main device receives an image sent by the camera and detects the image, and feeds back a detection result to the camera, and the first sensing circuit is configured to output the first electrical signal according to the feedback detection result.

3. The defrosting and defogging circuit of a camera according to claim 2, wherein the camera is in communication connection with the main device through a serial port adding unit, the first sensing circuit comprises a feedback unit and a pin, the feedback unit is arranged in the serial port adding unit, and the feedback unit controls the pin to output the first electric signal according to the feedback detection result.

4. The defrost and defog circuit of a camera of claim 1, wherein the second sensing circuit further comprises a voltage comparator and a first voltage dividing circuit and a second voltage dividing circuit connected in parallel, wherein a resistance value of the first voltage dividing circuit changes with a temperature of the camera; the comparator comprises a first input pin, a second input pin and an output pin, wherein the first input pin is electrically connected with the first voltage dividing circuit, the second input pin is electrically connected with the second voltage dividing circuit, and the output pin is electrically connected with the control circuit.

5. The defrost and defog circuit of a camera as claimed in claim 4, wherein the first voltage divider circuit comprises a thermistor and a first resistor connected in series, and the second voltage divider circuit comprises a second resistor and a third resistor connected in series; the first input pin is electrically connected between the thermistor and a first resistor, and the second input pin is electrically connected between the second resistor and a third resistor.

6. The defrosting and defogging circuit of a camera according to claim 1, wherein the heating circuit comprises an electronic switching device and an electric heating element, the electronic switching device is electrically connected with the output end of the control circuit, and the electronic switching device controls the electric heating element to work or stop working according to the third electric signal.

7. The defrost and defog circuit of a camera as claimed in claim 6, wherein the electronic switching device comprises a field effect transistor comprising a source, a gate, a drain; the grid electrode is electrically connected with the output end of the control circuit, and the drain electrode is electrically connected with the electric heating element; when the third level output by the control circuit is the first level, the electronic switching device is conducted, and the electric heating element starts to work; when the third level output by the control circuit is the second level, the electronic switching device is turned off, and the electric heating element stops working; the control circuit comprises a logic gate circuit, wherein the input end of the control circuit is an input pin of the logic gate, and the output end of the control circuit is an output pin of the logic gate.

8. The defrost and defog circuit of a camera as claimed in claim 1, wherein the defrost and defog circuit of the camera further comprises a power circuit for providing power to the defrost and defog circuit of the camera, the power circuit being electrically connected to a main power supply of a main device; the camera is in communication connection with the main equipment; when the main equipment is started, the main power supply supplies power to the power supply circuit.

9. A camera comprising an imaging assembly and a camera defrost and defog circuit as claimed in any one of claims 1 to 8.

10. A combination system with image processing function, characterized by comprising a camera according to claim 9 and a master device in communicative connection with the camera.