WO2018120074A1 - 用于监控摄像装置的夜视切换方法及其*** - Google Patents
用于监控摄像装置的夜视切换方法及其*** Download PDFInfo
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- WO2018120074A1 WO2018120074A1 PCT/CN2016/113639 CN2016113639W WO2018120074A1 WO 2018120074 A1 WO2018120074 A1 WO 2018120074A1 CN 2016113639 W CN2016113639 W CN 2016113639W WO 2018120074 A1 WO2018120074 A1 WO 2018120074A1
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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
- H04N23/60—Control of cameras or camera modules
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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
- H04N23/70—Circuitry for compensating brightness variation in the scene
Definitions
- the present invention relates to a surveillance camera device, and more particularly to a night vision switching method and system thereof for monitoring a camera device.
- Image sensors are one of the key components of camera devices. They mainly utilize the technology that image sensors can sense external light signals in space and convert them into image signals. Record the picture clearly.
- One of the fill light methods is continuous illumination with white light illumination or constant illumination brightness of white LED lights with constant illumination brightness, but constant illumination brightness fills light on the one hand, and on the other hand, changes with natural light at the same monitoring location.
- the effect of the constant illumination brightness is not good, and it is difficult to achieve a better image by taking the image, and the constant illumination brightness method in the prior art is usually based on the photosensitive element of the photoresistor to judge the brightness of the light, due to the photosensitive
- the resistor has the defects of inaccurate and inconsistent lighting conditions, which brings a lot of inconvenience to the construction work.
- the continuous illumination of the white light with constant illumination brightness cannot be satisfied, which leads to nighttime (or when the brightness is insufficient) )
- the quality of the captured image is poor.
- the second method of fill light is the infrared fill light method. Since the human eye can't capture infrared light, the optical imaging sensor of the camera can sense infrared light. Therefore, artificially supplementing infrared light is equivalent to enhancing external light, so that the external environment can be completely eliminated. In the case of light monitoring, there is also a good concealment effect, which can effectively improve the monitoring quality. However, it is necessary to determine whether it is necessary to turn on the fill light function according to the illumination brightness environment. In the case of sufficient light, try not to turn on the infrared light because Infrared light is more red, which will cause the picture to be reddish.
- the image when the infrared light is turned on, the image will be set to black and white, so that the color of the picture will not be affected, and the infrared must be turned on when the light is insufficient.
- Light so that you can see the picture clearly, so when the light is too weak, turn on the infrared light, the screen Noise will be more, and if the infrared light is turned on too early, it will enter the black and white picture too early, affecting the image quality, the same reason to turn off the infrared light It must also be on time, so when to turn the infrared light on and off becomes a critical issue. It is necessary to determine the opening and closing time of the infrared light by sensing the brightness of the outside world.
- the sensing of the external light brightness currently discloses the photosensitive photoresist.
- the installation method of the photoresistor will directly affect the photosensitive effect, because the optical lens area is at The photoresistor cannot be installed in the middle position.
- the photoresistor When the photoresistor is mounted on the left side of the optical lens area, the light on the right side cannot be sensed.
- the photoresistor When the photoresistor is installed in the above book, the light on the lower side cannot be sensed, and the photoresistor can only reflect the irradiation to the photoresistor.
- This change in light causes a change in the intensity of the infrared light, which is often limited in practical applications.
- the consistency of the photoresistor is relatively poor, and the consistency changes after being mounted on the machine.
- the price of the photoconductor with good consistency is expensive.
- another method for sensing the brightness of the outside light is to use the image sensor, and the photosensitivity is good, but after the light infrared lamp is turned on, the image sensor cannot distinguish the outside world. The light is still the compensation light of the infrared light, which causes the infrared light to be turned off. Otherwise, it is necessary to turn off the infrared light to determine whether the current light is sufficient without compensation, so the screen will have an intermittent black screen.
- a night vision switching method for monitoring a camera device which includes the following specific steps:
- the light-on step is to obtain the gain value of the current image sensor through the image sensor.
- the current image sensor gain value is higher than the set value, the light is turned on.
- the signal value of the photosensitive sensor in the case of light compensation is obtained by the photosensitive sensor.
- the signal value of the photosensitive sensor is higher than the signal value of the photosensitive sensor when the light is turned off, and the lamp is turned off.
- Step 1 Obtain the current image sensor gain value step, the image sensor acquires an image of the environment in which the camera device is located, and the digital signal processor in the image sensor obtains the captured image and analyzes and obtains the image sensor gain value of the current environment;
- Step 2 Fill the light step, turn on the light, and fill the light.
- the step of turning on the light further includes the step of acquiring data between the step of acquiring the image sensor gain value and the step of filling the light in step 2, and reading the current image picture brightness and the image sensor gain value.
- the step of obtaining the brightness of the image picture in the step 1 includes the following specific steps:
- Step 1 Acquire image image brightness step, the image sensor acquires image data of the environment where the camera device is located in real time, the image data is image data in the form of YUV data, Y represents image image brightness, and UV represents chromaticity;
- Step 2 acquiring image data, the digital signal processor acquiring data of the image data buffered in the source buffer;
- Step 3 determining the brightness of the image image, the API interface on the image sensor driver directly obtains the ME data of one frame image from the source buffer, and the ME data is the data containing only the Y component, and the average value is obtained after the Y value is obtained to determine the current Image image brightness, and read the set image image brightness target value at the same time.
- Step 4 Obtain the current sensor gain value of the automatic exposure, and automatically adjust the gain value and exposure time of the image sensor during automatic exposure.
- step of acquiring the image sensor gain value in step 1 further comprises a compensation step between the step of acquiring data and the step of filling light, the pair of images The sensor gain value is compensated.
- Step 1 Recording step, recording the current photosensor signal value as the photosensitive signal value when the lamp is turned on;
- Step 2 a calculation step of calculating a photosensor signal value when the lamp is turned off and an image sensor gain value when the lamp is turned off;
- Step 3 The second determining step determines whether the image sensor gain value is greater than the image sensor gain value when the light is turned off, and if the image sensor gain value is not greater than the image sensor gain value when the light is turned off, performing a third determining step; if the image sensor The gain value is greater than the image sensor gain value when the lamp is turned off; then the recording step is performed;
- Step 4 The third determining step determines whether the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, and if the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, performing a shutdown step; When the photosensor signal value is not greater than the photosensor signal value when the lamp is turned off, the step of determining the brightness of the image image is performed;
- Step 5 Close the steps and turn off the lights.
- Step 1 The night vision state determining step determines whether the night vision state is currently entered. If the night vision state is currently entered, the third determining step is performed. If the night vision state is not currently entered, the image sensor gain value determining step is performed;
- Step 2 The image sensor gain value determining step determines whether the current image sensor gain value is greater than the image sensor gain value when the light is turned off, and enters the night vision if the current image sensor gain value is greater than the image sensor gain value when the light is turned off.
- the number processing step if the current image sensor gain value is not greater than the image sensor gain value when the lamp is turned off, repeating the step of determining the image image brightness step;
- Step 3 Enter the night vision processing step, and increase the number of night visions into one more time;
- Step 4 Enter the night vision number determination step, determine whether the number of night visions is greater than the set number of times, and if the number of night visions is not greater than the set number of times, perform the step of determining the brightness of the image picture, if the number of night visions is entered If it is greater than the set number of times, set the number of night visions to zero, turn on the light, set the shooting mode of the camera to black and white mode, and wait for the photosensor signal value to stabilize before performing the recording step.
- Step 1 the image picture brightness value determining step, determining whether the current image picture brightness value is greater than the image picture target upper limit value, if the current image picture brightness value is greater than the image picture target upper limit value, waiting for the image picture brightness value to be stable, Repeating the step of obtaining the image image brightness value, if the current image picture brightness value is not greater than the image picture target upper limit value, performing a determining step;
- Step 2 determining step, determining whether the current image sensor gain value is greater than an image sensor gain value when the light is turned off, and setting the number of exiting night vision if the current image sensor gain value is not greater than the image sensor gain value when the light is turned off. Equal to zero; if the current image sensor gain value is greater than the image sensor gain value when the lamp is turned off, the signal value determining step is performed;
- Step 3 The signal value judging step determines whether the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, and if the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, the step of exiting the night vision process is performed. If the current photosensor signal value is not greater than the photosensor signal value when the lamp is turned off, then the number of times of setting out of the night vision is equal to zero, and the step of determining the brightness of the image picture is entered;
- Step 4 Exit the night vision processing step, and increase the number of night vision exits
- Step 5 Exit the night vision number judgment step, determine whether the number of times of exiting the night vision is greater than the set number of times, and if the number of times of exiting the night vision is not greater than the set number of times, set the number of times of exiting the night vision to be equal to zero, and determine the video image.
- the closing step if the number of night vision exits is greater than the set number of times, the closing step is performed, and the shooting mode of the imaging device is set to the color mode, and the number of times of exiting the night vision is set to be equal to zero, and the step of determining the brightness of the image picture is performed.
- the present invention also provides a night vision switching system for monitoring a camera device, comprising a light-on unit and a light-off unit, the light-emitting unit comprising the acquisition gain value module, the acquisition data module, the compensation module, and the fill light module;
- the light off unit includes a recording module, a calculation module, a second determination module, a third determination module, and a shutdown module;
- the acquiring gain value module is configured to acquire an image of an environment in which the image capturing device is located, and the digital signal processor in the image sensor obtains the captured image and analyzes the image sensor gain value of the current environment;
- the acquiring data module is configured to read a current image picture brightness and a sensor gain value, and is connected to the acquired gain value module;
- the compensation module is configured to compensate an image sensor gain value and connect to the acquired data module;
- the fill light module is configured to turn on an infrared light, perform fill light, and connect with the compensation module;
- the recording module is configured to record a current photosensor signal value, and is connected to the fill light module as a photosensitive signal value when the lamp is turned on;
- the calculation module is configured to calculate a photosensor signal value when the infrared lamp is turned off according to a photosensor signal value when the infrared lamp is turned on, and determine a sensor gain value when the infrared lamp is turned off, and connect the recording module to the recording module;
- the second determining module is configured to determine whether the current sensor gain value is greater than a sensor gain value when the infrared light is turned off, and is respectively connected to the calculating module and the recording module;
- the third determining module is configured to determine whether the current photosensor signal value is greater than a photosensor signal value when the infrared lamp is turned off, and is respectively connected to the second determining module and the acquiring gain value module;
- the shutdown module is configured to turn off the infrared light and connect with the third determining module.
- the obtaining the gain value module comprises: acquiring an image picture brightness sub-module, acquiring an image data sub-module, and determining an image picture brightness sub-module;
- the acquiring image picture brightness sub-module is configured to acquire image data of an environment in which the image capturing device is located in real time, and is connected to the acquired image data sub-module;
- the acquiring image data sub-module is configured to acquire, by the digital signal processor, data of the image data buffered in the source buffer, and connect to the determined image picture brightness sub-module;
- the determining image picture brightness sub-module is used for the API interface on the image sensor driver to directly obtain the ME data of one frame image from the source buffer, and the ME data is the data containing only the Y component, and the average value is obtained after obtaining the Y value. Determining the brightness of the current image picture, and simultaneously reading the set image image brightness target value, and respectively connecting with the acquired image data sub-module and the acquired data module.
- the beneficial effects of the present invention compared with the prior art are: the night vision switching method for the surveillance camera device of the present invention, which controls the switching of the night vision by the external sensing brightness of the image sensor and the photosensitive sensor, and obtains the image by using the image sensor.
- the image of the environment in which the device is located obtains the brightness of the current image, determines whether the light needs to be turned on for the brightness compensation according to the brightness of the current image, and then controls the light to be turned off according to the photosensitive sensor and/or the image sensor, thereby compensating the monitoring image.
- the brightness of the light is within a reasonable range, and it can realize 24 hours of unobstructed monitoring throughout the day, and ensure that the monitoring effect is basically unchanged under the condition that the ambient light intensity is constantly changing, saving energy, improving the service life of the surveillance camera device, and concealing effect. it is good.
- FIG. 1 is a flow chart of a night vision switching method for a surveillance camera device according to an embodiment of the present invention
- FIG. 2 is a block diagram showing a specific process of a night vision switching method for monitoring a camera device according to an embodiment of the present invention
- FIG. 3 is a structural block diagram of a night vision switching system for a surveillance camera device according to an embodiment of the present invention.
- FIG. 5 is an experimental graph (when the lamp is turned on) for monitoring the difference of the photosensitive sensor of the camera device at different temperatures to different machines according to an embodiment of the present invention
- FIG. 6 is an experimental graph of varying slopes of different temperature interval photosensors for different machines according to an embodiment of the present invention.
- the night vision switching method for monitoring the camera device provided by the embodiment can be used in the camera device to achieve a very accurate control of the camera device to turn off or turn on the light in the same environment. 24 hours a day, barrier-free monitoring, and ensure that the monitoring effect is basically unchanged in the case of constant changes in the ambient light intensity, and the concealing effect is good.
- the night vision switching method for monitoring the camera device includes the following specific steps:
- the light-on step is to obtain the gain value of the current image sensor through the image sensor.
- the current image sensor gain value is higher than the set value, the light is turned on.
- the signal value of the photosensitive sensor in the case of light compensation is obtained by the photosensitive sensor.
- the signal value of the photosensitive sensor is higher than the signal value of the photosensitive sensor when the light is turned off, and the lamp is turned off.
- the above-mentioned night vision switching method for monitoring the camera device controls the night vision switching by the image sensor and the photosensitive sensor inducing the external illumination brightness, and uses the image sensor to acquire the image of the environment in which the camera device is located, and obtains the current image image brightness. According to the brightness of the current image picture, it is judged whether the light needs to be turned on for the illumination brightness compensation, and then the light is controlled to be turned off according to the photosensitive sensor and/or the image sensor, thereby compensating for the illumination brightness of the monitoring image within a reasonable range, and achieving 24 hours a day.
- the obstacles are monitored, and the monitoring effect is basically unchanged under the condition that the ambient light intensity is constantly changing, the energy is saved, the service life of the monitoring camera device is improved, and the concealing effect is good.
- the image sensor gain value in the case of light compensation is lower than the image sensor gain value when the light is turned off, as an auxiliary condition for turning off the light.
- step of turning on the light comprises the following specific steps:
- Step 1 Obtain an image sensor gain value step, the image sensor acquires an image of an environment in which the camera device is located, and the digital signal processor in the image sensor obtains the captured image and analyzes and obtains an image sensor gain value of the current environment;
- Step 2 Fill the light step, turn on the light, and fill the light.
- the step of turning on the light further includes the step of acquiring data between the step of acquiring the image sensor gain value and the step of filling the light in step 2, and reading the current image picture brightness and the image sensor gain value.
- step of acquiring the image sensor gain value in the step 1 includes the following specific steps:
- Step 1 Acquire image image brightness step, the image sensor acquires image data of the environment where the camera device is located in real time, the image data is image data in the form of YUV data, Y represents image image brightness, and UV represents chromaticity;
- Step 2 acquiring image data, the digital signal processor acquiring data of the image data buffered in the source buffer;
- Step 3 determining the brightness of the image image, the API interface on the image sensor driver directly obtains the ME data of one frame image from the source buffer, and the ME data is the data containing only the Y component, and the average value is obtained after the Y value is obtained to determine the current Image image brightness, and simultaneously read the set image image brightness target value;
- Step 4 Obtain the current sensor gain value of the automatic exposure, and automatically adjust the gain value and exposure time of the image sensor during automatic exposure.
- the step 1 of acquiring the image sensor gain value further comprises a compensation step between the step of acquiring data and the step of filling light, and compensating the image sensor gain value.
- the compensation step of the above compensation step is as follows: when the AE runs, the target brightness has a certain range, for example, 100 to 120 are regarded as the standard brightness, and in the same external brightness environment, the image brightness value is under the standard brightness.
- the image sensor gain value is small when the time limit is limited, and the image sensor gain value is higher when the image brightness value is at the upper limit value of the standard brightness, in order to make the image sensor gain value correspond to the ambient brightness value.
- the image sensor gain value needs to be compensated.
- the specific compensation is related to the measured data, depending on the actual situation.
- the step of turning off the light includes the following specific steps:
- Step 1 Recording step, recording the current photosensor signal value as the photosensitive signal value when the lamp is turned on;
- Step 2 a calculation step of calculating a photosensor signal value when the lamp is turned off and an image sensor gain value when the lamp is turned off;
- Step 3 The second determining step determines whether the image sensor gain value is greater than the image sensor gain value when the light is turned off, and if the image sensor gain value is not greater than the image sensor gain value when the light is turned off, performing a third determining step; if the image sensor The gain value is greater than the image sensor gain value when the lamp is turned off; then the recording step is performed;
- Step 4 The third determining step determines whether the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, and if the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, performing a shutdown step; When the photosensor signal value is not greater than the photosensor signal value when the lamp is turned off, the step of determining the brightness of the image image is performed;
- Step 5 Close the steps and turn off the lights.
- the second determining step described above includes the following specific steps:
- Step 1 The night vision state determining step determines whether the night vision state is currently entered. If the night vision state is currently entered, the third determining step is performed. If the night vision state is not currently entered, the image sensor gain value determining step is performed;
- Step 2 The image sensor gain value determining step determines whether the current image sensor gain value is greater than the image sensor gain value when the light is turned off, and enters the night vision if the current image sensor gain value is greater than the image sensor gain value when the light is turned off.
- the number processing step if the current image sensor gain value is not greater than the image sensor gain value when the lamp is turned off, repeating the step of determining the image image brightness step;
- Step 3 Enter the night vision processing step, and increase the number of night visions into one more time;
- Step 4 Enter the night vision number determination step, determine whether the number of night visions is greater than the set number of times, and if the number of night visions is not greater than the set number of times, perform the step of determining the brightness of the image picture, if the number of night visions is entered If it is greater than the set number of times, set the number of night visions to zero, turn on the light, set the shooting mode of the camera to black and white mode, and wait for the photosensor signal value to stabilize before performing the recording step.
- the third step of the above step 4 includes the following specific steps:
- Step 1 the image picture brightness value determining step, determining whether the current image picture brightness value is greater than the image picture target upper limit value, if the current image picture brightness value is greater than the image picture target upper limit value, waiting for the image picture brightness value to be stable, Repeating the step of obtaining the image image brightness value, if the current image picture brightness value is not greater than the image picture target upper limit value, performing a determining step;
- Step 2 determining step, determining whether the current image sensor gain value is greater than an image sensor gain value when the light is turned off, and setting the number of exiting night vision if the current image sensor gain value is not greater than the image sensor gain value when the light is turned off. Equal to zero; if the current image sensor gain value is greater than the image sensor gain value when the lamp is turned off, the signal value determining step is performed;
- Step 3 The signal value judging step determines whether the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, and if the current photosensor signal value is greater than the photosensor signal value when the lamp is turned off, the step of exiting the night vision process is performed. If the current photosensor signal value is not greater than the photosensor signal value when the lamp is turned off, then the number of times of setting out of the night vision is equal to zero, and the step of determining the brightness of the image picture is entered;
- Step 4 Exit the night vision processing step, and increase the number of night vision exits
- Step 5 Exit the night vision number judgment step, determine whether the number of times of exiting the night vision is greater than the set number of times, and if the number of times of exiting the night vision is not greater than the set number of times, set the number of times of exiting the night vision to be equal to zero, and determine the video image.
- the closing step if the number of night vision exits is greater than the set number of times, the closing step is performed, and the shooting mode of the imaging device is set to the color mode, and the number of times of exiting the night vision is set to be equal to zero, and the step of determining the brightness of the image picture is performed.
- step 1 image picture brightness value judging step, when the lamp is stable and then the photosensor signal value is recorded, the influence of the lamp reflected light on the image is evaluated.
- the main purpose is to prevent an error when the brightness of the image sensor is not pulled up and the ambient light brightness is darkened when the brightness of the image is low.
- the photosensor is a photoresistor.
- the photosensor may be a photosensor such as a photodiode.
- the photosensor signal value refers to the photosensor ADC value.
- the photosensor signal value when the lamp is turned off and the image sensor gain value when the lamp is turned off are calculated by collecting the difference value of the photosensor signal values for turning on night vision and turning off night vision.
- FIG. 4 to FIG. 6 different photosensitive sensors have different degrees of response to temperature, and different photosensitive sensors have different sensitivity to light, so the photosensitive sensor signal values will be different, and FIG. 4 is for the same pair of five pairs of light sources.
- Photosensitive sensor ADC test values at different temperatures, because the photosensor is only used when the IR lamp is turned on; and Figure 5 is the slope of the change of the photosensors of different temperature range machines, and the results show that the slope of the machine with different temperatures is also different. Inconsistent.
- ADC_diff ((ADC_cali)*((LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX*10)/
- LIGHT_SENSOR_CALI_LUX /10; Where LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX is the ambient light level value that turns off night vision. LIGHT_SENSOR_CALI_LUX produces ambient light level values for calibration.
- the photosensor does not participate in the determination based on the determination of the image sensor; if the current photographing device is in the night mode, the determination of the photosensor is dominant, and the image sensor is determined. Supplemented.
- the lamp is an infrared lamp.
- the lamp may also be other fill lamps.
- the embodiment further provides a night vision switching system for monitoring a camera device, a light-on unit and a light-off unit, the light-emitting unit including the acquisition gain value module, the acquisition data module 20, the compensation module 30, and the fill light module.
- the light-off unit includes a recording module 50, a calculation module 60, a second determination module, a third determination module, and a shutdown module 70.
- the acquisition gain value module is configured to acquire an image of an environment where the imaging device is located,
- the digital signal processor in the image sensor acquires the captured image and analyzes the image sensor gain value of the current environment;
- the acquisition data module 20 is configured to read the current image image brightness and the image sensor gain value, and the obtaining The gain value module is connected;
- the compensation module 30 is configured to compensate the image sensor gain value, and is connected to the acquired data module 20;
- the fill light module 40 is configured to turn on the light, perform fill light, and connect with the compensation judgment module 30.
- a recording module 50 configured to record a current photosensor signal value, as a photosensitive signal value when the lamp is turned on, and the complement
- the module 40 is connected;
- the calculation module 60 is configured to calculate the photosensor signal value when the lamp is turned off and the illumination brightness when the lamp is turned off according to the photosensor signal value when the lamp is turned on, and determine the image sensor gain value to be connected with the recording module 50;
- the second determining module is configured to determine whether the current image sensor gain value is greater than the image sensor gain value when the light is turned off, and is respectively connected to the calculating module 60 and the recording module 50; and the third determining module is configured to determine the current photosensitive sensor signal. Whether the value is greater than the photosensor signal value when the lamp is turned off is respectively connected to the second judging module and the acquiring gain value module; and the closing module 70 is configured to turn off the lamp and connect with the third judging module.
- the compensation of the above compensation module 30 is as follows: when the AE is running, the target brightness has a certain range, for example, 100 to 120 are regarded as the standard brightness, and in the same external brightness environment, when the image brightness value is at the lower limit of the standard brightness, The image sensor gain value is small, and the image sensor gain value is higher when the image brightness value is at the upper limit of the standard brightness, in order to make the image sensor gain value correspond to the ambient brightness value. When the brightness is close to the upper and lower limits of the standard brightness, the image sensor gain value needs to be compensated. The specific compensation is related to the measured data, depending on the actual situation.
- ADC_diff can refer to the following ways:
- ADC_diff ((ADC_cali)*((LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX*10)/
- LIGHT_SENSOR_CALI_LUX /10; Where LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX is the ambient light level value that turns off night vision. LIGHT_SENSOR_CALI_LUX produces ambient light level values for calibration.
- the acquiring gain value module includes: acquiring image picture brightness sub-module 10, acquiring image data sub-module 11 and determining image picture brightness sub-module 12 and acquiring exposure gain value sub-module 13;
- the image brightness sub-module 10 is configured to acquire image data of an environment in which the image capturing device is located in real time, and is connected to the acquired image data sub-module 11; and acquire an image data sub-module 11 for acquiring image data in the digital signal processor.
- the data of the source buffer is connected to the determined image picture brightness sub-module 12; the determined image picture brightness sub-module 12 is used for the API interface on the image sensor driver to directly obtain the ME data of one frame image from the source buffer.
- the ME data is data containing only the Y component. After obtaining the Y value, the average value is used to determine the brightness of the current image picture, and the set image image brightness target value is read, and the obtained exposure gain value sub-module is connected;
- the acquisition exposure gain value sub-module 13 is configured to acquire a sensor gain value of the current automatic exposure, and automatically adjust the gain value and the exposure time of the image sensor when the automatic exposure is performed, and is connected to the acquired data module 20.
- the second determining module includes a night vision state determining sub-module 91, a sensor gain value judging sub-module 92, a night-vision-of-nights number processing sub-module 93, and a night-time-of-nights number determining sub-module 94.
- the night vision state judging sub-module 91 is configured to determine whether the night vision state is currently entered, and is respectively connected to the calculation module 60 and the sensor gain value judging sub-module 92; the sensor gain value judging sub-module 92 is used. And determining whether the current image sensor gain value is greater than the image sensor gain value when the light is turned off, respectively, and connecting to the night vision time processing sub-module 93 and the determined image picture brightness sub-module 12; the entering night vision time processing sub-module 93, the number of times for entering the night vision is added more than once, and is connected to the night vision number determining sub-module 94; the entering night vision number determining sub-module 94 is configured to determine whether the number of night visions entering the night vision is greater than the set The number of times is respectively connected to the determined image picture brightness sub-module 12, the closing module 70, and the recording module 50.
- the third determining module includes a video picture brightness value determining sub-module 80, a determining sub-module 81, a signal value judging sub-module 82, an exit night-vision time processing sub-module 83, and an exit night-vision number judging sub-module 84;
- the image picture brightness value determining sub-module 80 is configured to determine whether the image picture brightness value is greater than the image picture target upper limit value, and is connected to the determined image picture brightness sub-module 12 and the determining sub-module 81;
- the module 81 is configured to determine whether the current image sensor gain value is greater than an image sensor gain value when the lamp is turned off, and is respectively connected to the shutdown module 70 and the signal value judging sub-module 82; and the signal value judging sub-module 82 is configured to determine the current photo-sensitivity Whether the sensor signal value is greater than the photosensor signal value when the lamp is turned off, and is respectively connected to the exit night vision number processing sub-module 83 and the determined image picture brightness sub-module 12; the exit night-vision time processing sub-module 83 is used The number of times of exiting the night vision is further increased, and is connected to the exit night vision number judging sub-module 84; the exit night vision number judging sub-module 84 is connected to determine whether the number of exiting night
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Abstract
本发明涉及用于监控摄像装置的夜视切换方法及其***,该方法包括开灯步骤,通过图像传感器获取当前图像传感器的增益值,当前的图像传感器的增益值高于设定值时,开启灯。关灯步骤,通过光敏传感器获取在光补偿情况下光敏传感器的信号值,在光补偿情况下光敏传感器的信号值高于关灯时的光敏传感器的信号值,关闭灯。本发明利用图像传感器获取摄像装置所处的环境的图像,获取当前的影像图片亮度,根据影像图片亮度判断是否需要开启灯进行光照亮度补偿,通过光敏传感器和/或图像传感器控制关闭灯,实现全天24小时无障碍监控,保证在外界环境光强不断变化情况下监控效果不变,节约能源,提高监控摄像装置的使用寿命,隐蔽效果好。
Description
技术领域
本发明涉及监控摄像装置,更具体地说是指用于监控摄像装置的夜视切换方法及其***。
背景技术
目前,摄像监控装置已被广泛应用到各个领域中,图像传感器作为摄像装置的关键零部件之一,其主要利用了图像传感器可在空间中感应外界光信号并将其转换成图像信号的技术,将画面清晰地记录下来。
然而,在全天24小时均需要监控的安防等领域,对监控摄像机的性能提出了更高的要求,如:监控摄像设备在白天和黑夜(或者亮处与暗处)等光照亮度不一致的情况下,都需要有出色的监控效果。对于监控摄像机来说,在光线充足的白天或者有充足照明光照亮度的黑夜或暗处一般都有较好的拍摄效果。但是,在低光照亮度环境下(光线较暗甚至没有光线的情况下),监控摄像装置在光线不足的区域不能有效成像,达不到大范围照射的目的。通常只能通过拉大曝光时间,放大增益值来进行拍摄,此时的图像噪点很大,拍摄的图像画面质量较差。
针对上述光照不足的问题,现有技术中通过给监控摄像机照射环境补光是直接的解决办法。
补光方法之一是采用恒定光照亮度的白灯照明或恒定光照亮度白光LED灯持续照明,但是恒定光照亮度补光一方面存在能源浪费,另一方面,在同一监控地点随着自然光的不断变化,导致恒定光照亮度补光的效果不佳,很难实现拍摄的图像达到较理想的效果,而且现有技术中的恒定光照亮度补光方法通常基于光敏电阻的感光元件来判断光照亮度,由于光敏电阻存在判断光照条件不准确和不一致的缺陷,给施工工作带来诸多不便,另外,对于有些不能有效供电的地方,不能满足恒定光照亮度白光灯的持续照明,进而导致夜间(或者光照亮度不足时)拍摄的图像质量较差。
补光方法之二是红外补光方法,由于人眼不能捕捉红外光,但是摄像机的光学成像传感器能感应红外光,因此通过人为补充红外光相当于增强外界光线,这样既能达到外界环境完全无光的情况下监控,还有很好的隐蔽效果,能有效提高监控质量,但是,需要根据光照亮度环境来确定是否需要开启补光功能,在光线足够的情况下是尽量不要开启红外灯,因为红外灯红光偏多,会导致画面偏红,为解决这一问题在开启红外灯的时候图像会设定成黑白画面,也就不会影响画面颜色了,而在光线不足时就必须开启红外灯,这样才能看清楚画面,所以在光线太弱时才打开红外灯,画面Noise会比较多,而红外灯开启过早的话会过早的进入黑白画面,影响影像品质,同样的道理关闭红外灯也会必须准时,因此什么时候开启与关闭红外灯成为至关重要的问题。需要通过对外界的光照亮度进行感应判断后再决定红外灯的开启和关闭时间,对外界光照亮度的感应目前公开了光敏电阻感光,光敏电阻的安装方式将直接影响感光效果,因为光学镜头区域处于中间位置不能安装光敏电阻,当光敏电阻安装在光学镜头区域的左侧就不能感应右侧的光线,当光敏电阻安装在上册就不能感应下侧的光线,而且光敏电阻只能反映照射到光敏电阻这一点的光线变化而导致红外光强的变化,在实际应用中经常受到限制,光敏电阻的一致性比较差,而安装到机器上之后一致性又会发生变化。而且一致性好的光敏电阻的价格又昂贵,目前还公布了另一种对外界光照亮度的感应的方法为使用图像传感器,感光一致性好,但是光红外灯开启之后,图像传感器不能区分是外界光线还是红外灯的补偿光线,从而导致关闭红外灯不及时,不然就需要先关闭红外灯再来判定当前的光线是否足够而不需要进行补偿,所以画面会出现间歇性的黑屏。
因此,有必要设计一种用于监控摄像装置的夜视切换方法,解决以下问题:1.使用光敏电阻感光会一致比较差,不同的机器,不同的角度,不同的环境的光照亮度切换点都不一致;2.使用影像传感器感光会出现关闭不及时或者在补光的时候需要关闭红外灯,从而影响图像质量。
发明内容
本发明的目的在于克服现有技术的缺陷,提供用于监控摄像装置的夜视切换方法及其***。
为实现上述目的,本发明采用以下技术方案:用于监控摄像装置的夜视切换方法,包括以下具体步骤:
开灯步骤,通过图像传感器获取当前图像传感器的增益值,当前的图像传感器的增益值高于设定值时,开启灯。
关灯步骤,通过光敏传感器获取在光补偿情况下光敏传感器的信号值,在光补偿情况下光敏传感器的信号值高于关灯时的光敏传感器的信号值,关闭灯。
其进一步技术方案为:所述开灯步骤包括以下具体步骤:
步骤一、获取当前图像传感器增益值步骤,图像传感器获取摄像装置所处环境的图像,图像传感器内的数字信号处理器获取拍摄的图像后分析得出当前环境的图像传感器增益值;
步骤二、补光步骤,开启灯,进行补光。
其进一步技术方案为:所述开灯步骤还包括位于步骤一获取图像传感器增益值步骤与步骤二补光步骤之间的获取数据步骤,读取当前的影像图片亮度以及图像传感器增益值。
其进一步技术方案为:在所述步骤一获取影像图片亮度步骤,包括以下具体步骤:
步骤1、获取影像图片亮度步骤,图像传感器实时获取摄像装置所处环境的图像数据,所述图像数据为YUV数据形式的图像数据,Y代表影像图片亮度,UV代表色度;
步骤2、获取图像数据步骤,数字信号处理器获取图像数据缓存在源缓冲区的数据;
步骤3、确定影像图片亮度步骤,影像传感器驱动上的API接口直接从源缓冲区中获取一帧图像的ME数据,ME数据是只含有Y分量的数据,取得Y值后取平均值来确定当前影像图片亮度,同时读取所设定的影像图片亮度目标值。
步骤4、获取当前自动曝光的传感器增益值,自动曝光的时候会自动调影像传感器的增益值与曝光时间。
5.根据权利要求3所述的用于监控摄像装置的夜视切换方法,其特征在于,所述步骤一获取图像传感器增益值步骤还包括位于获取数据步骤与补光步骤之间的补偿步骤,对图像传感器增益值进行补偿。
其进一步技术方案为:所述关灯步骤包括以下具体步骤:
步骤一、记录步骤,记录当前的光敏传感器信号值,作为开启灯时的光敏信号值;
步骤二、计算步骤,计算关闭灯时的光敏传感器信号值以及关闭灯时的图像传感器增益值;
步骤三、第二判断步骤,判断图像传感器增益值是否大于关闭灯时的图像传感器增益值,若图像传感器增益值不大于关闭灯时的图像传感器增益值,则进行第三判断步骤;若图像传感器增益值大于关闭灯时的图像传感器增益值;则进行记录步骤;
步骤四、第三判断步骤,判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,若当前的光敏传感器信号值大于关闭灯时的光敏传感器信号值,进行关闭步骤;若当前的光敏传感器信号值不大于关闭灯时的光敏传感器信号值,则进行确定影像图片亮度步骤;
步骤五、关闭步骤,关闭灯。
其进一步技术方案为:所述第二判断步骤包括以下具体步骤:
步骤1、夜视状态判断步骤,判断当前是否进入夜视状态,若当前进入夜视状态,则进行第三判断步骤,若当前不是进入夜视状态,进行图像传感器增益值判断步骤;
步骤2、图像传感器增益值判断步骤,判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,若当前的图像传感器增益值大于关闭灯时的图像传感器增益值,则进行进入夜视次数处理步骤,若当前的图像传感器增益值不大于关闭灯时的图像传感器增益值,则重复确定影像图片亮度步骤;
步骤3、进入夜视次数处理步骤,进入夜视的次数加多一次;
步骤4、进入夜视次数判断步骤,判断进入夜视的次数是否大于设定的次数,若进入夜视的次数不大于设定的次数,则进行确定影像图片亮度步骤,若进入夜视的次数大于设定的次数,则设定进入夜视次数为零次,打开灯,同时设定摄像装置的拍摄模式为黑白模式,并且等待光敏传感器信号值稳定后,进行记录步骤。
其进一步技术方案为:所述第三判断步骤包括以下具体步骤:
步骤1、影像图片亮度值判断步骤,判断当前的影像图片亮度值是否大于影像图片目标上限值,若当前的影像图片亮度值大于影像图片目标上限值,则等待影像图片亮度值稳定后,重复获取影像图片亮度值步骤,若当前的影像图片亮度值不大于影像图片目标上限值,则进行判断步骤;
步骤2、判断步骤,判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,若当前的图像传感器增益值不大于关闭灯时的图像传感器增益值,则设定退出夜视的次数等于零次;若当前的图像传感器增益值大于关闭灯时的图像传感器增益值,则进行信号值判断步骤;
步骤3、信号值判断步骤,判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,若当前的光敏传感器信号值大于关闭灯时的光敏传感器信号值,进行退出夜视次数处理步骤,若当前的光敏传感器信号值不大于关闭灯时的光敏传感器信号值,则进行设定退出夜视的次数等于零次,并进入确定影像图片亮度步骤;
步骤4、退出夜视次数处理步骤,退出夜视的次数加多一次;
步骤5、退出夜视次数判断步骤,判断退出夜视的次数是否大于设定的次数,若退出夜视的次数不大于设定的次数,设定退出夜视的次数等于零次,进行确定影像图片亮度步骤,若夜视的次数退出大于设定的次数,则进行关闭步骤,同时设定摄像装置的拍摄模式为彩色模式,设定退出夜视的次数等于零次,进行确定影像图片亮度步骤。
本发明还提供了用于监控摄像装置的夜视切换***,包括开灯单元以及关灯单元,所述开灯单元包括所述获取增益值模块、获取数据模块、补偿模块以及补光模块;所述关灯单元包括记录模块、计算模块、第二判断模块、第三判断模块以及关闭模块;
所述获取增益值模块,用于图像传感器获取摄像装置所处环境的图像,图像传感器内的数字信号处理器获取拍摄的图像后分析得出当前环境的图像传感器增益值;
所述获取数据模块,用于读取当前的影像图片亮度以及传感器增益值,与所述获取增益值模块连接;
所述补偿模块,用于对图像传感器增益值进行补偿,与所述获取数据模块连接;
所述补光模块,用于开启红外灯,进行补光,与所述补偿模块连接;
所述记录模块,用于记录当前的光敏传感器信号值,作为开启灯时的光敏信号值,与所述补光模块连接;
所述计算模块,用于根据开启红外灯时的光敏传感器信号值计算关闭红外灯时的光敏传感器信号值以及关闭红外灯时的光照亮度判断传感器增益值,与所述记录模块连接;
所述第二判断模块,用于判断当前的传感器增益值是否大于关闭红外灯时的传感器增益值,分别与所述计算模块以及所述记录模块连接;
所述第三判断模块,用于判断当前的光敏传感器信号值是否大于关闭红外灯时的光敏传感器信号值,分别与所述第二判断模块以及所述获取增益值模块连接;
所述关闭模块,用于关闭红外灯,与所述第三判断模块连接。
其进一步技术方案为:所述获取增益值模块包括获取影像图片亮度子模块、获取图像数据子模块以及确定影像图片亮度子模块;
所述获取影像图片亮度子模块,用于图像传感器实时获取摄像装置所处环境的图像数据,与所述获取图像数据子模块连接;
所述获取图像数据子模块,用于数字信号处理器获取图像数据缓存在源缓冲区的数据,与所述确定影像图片亮度子模块连接;
所述确定影像图片亮度子模块,用于影像传感器驱动上的API接口直接从源缓冲区中获取一帧图像的ME数据,ME数据是只含有Y分量的数据,取得Y值后取平均值来确定当前影像图片亮度,同时读取所设定的影像图片亮度目标值,分别与所述获取图像数据子模块以及所述获取数据模块连接。
本发明与现有技术相比的有益效果是:本发明的用于监控摄像装置的夜视切换方法,通过图像传感器与光敏传感器共同感应外界光照亮度来控制夜视的切换,利用图像传感器获取摄像装置所处的环境的图像,获取当前的影像图片亮度,根据当前影像图片亮度判断是否需要开启灯进行光照亮度补偿,再根据通过光敏传感器和/或图像传感器,控制关闭灯,进而补偿监控图像的光照亮度在合理的范围内,实现全天24小时无障碍监控,且保证在外界环境光强不断变化的情况下监控效果基本不变,节约了能源,提高了监控摄像装置的使用寿命,隐蔽效果好。
下面结合附图和具体实施例对本发明作进一步描述。
附图说明
图1为本发明具体实施例提供的用于监控摄像装置的夜视切换方法的流程框图;
图2为本发明具体实施例提供的用于监控摄像装置的夜视切换方法的具体流程框图;
图3为本发明具体实施例提供的用于监控摄像装置的夜视切换***的结构框图;
图4为本发明具体实施例提供的光敏传感器在不同温度对不同机台的差异的实验数据表格(开启灯时);
图5为本发明具体实施例提供的用于监控摄像装置的光敏传感器在不同温度对不同机台的差异的实验曲线图(开启灯时);
图6为本发明具体实施例提供的不同的温度区间光敏传感器对不同机台的变化斜率的实验曲线图。
附图标记
10 获取影像图片亮度子模块 11 获取图像数据子模块
12 确定影像图片亮度子模块 20 获取数据模块
30 补偿模块 40 补光模块
50 记录模块 60 计算模块
70 关闭模块 80 影像图片亮度值判断子模块
81 判断子模块 82 信号值判断子模块
83 退出夜视次数处理子模块 84 退出夜视次数判断子模块
91 夜视状态判断子模块 92 传感器增益值判断子模块
93 进入夜视次数处理子模块 94 进入夜视次数判断子模块
13 获取曝光增益值子模块
具体实施方式
为了更充分理解本发明的技术内容,下面结合具体实施例对本发明的技术方案进一步介绍和说明,但不局限于此。
如图1~6所示的具体实施例,本实施例提供的用于监控摄像装置的夜视切换方法,可以运用在摄像装置中,实现非常准确的控制摄像装置在同一环境下关闭或者开启灯,全天24小时无障碍监控,且保证在外界环境光强不断变化的情况下监控效果基本不变,隐蔽效果好。
用于监控摄像装置的夜视切换方法,包括以下具体步骤:
开灯步骤,通过图像传感器获取当前图像传感器的增益值,当前的图像传感器的增益值高于设定值时,开启灯。
关灯步骤,通过光敏传感器获取在光补偿情况下光敏传感器的信号值,在光补偿情况下光敏传感器的信号值高于关灯时的光敏传感器的信号值,关闭灯。
上述的用于监控摄像装置的夜视切换方法,通过图像传感器与光敏传感器共同感应外界光照亮度来控制夜视的切换,利用图像传感器获取摄像装置所处的环境的图像,获取当前的影像图片亮度,根据当前影像图片亮度判断是否需要开启灯进行光照亮度补偿,再根据通过光敏传感器和/或图像传感器,控制关闭灯,进而补偿监控图像的光照亮度在合理的范围内,实现全天24小时无障碍监控,且保证在外界环境光强不断变化的情况下监控效果基本不变,节约了能源,提高了监控摄像装置的使用寿命,隐蔽效果好。
对于上述的关灯步骤,还可以在光补偿情况下图像传感器增益值低于关灯时图像传感器增益值,作为关闭灯的辅助条件.
更进一步的,所述开灯步骤包括以下具体步骤:
步骤一、获取图像传感器增益值步骤,图像传感器获取摄像装置所处环境的图像,图像传感器内的数字信号处理器获取拍摄的图像后分析得出当前环境的图像传感器增益值;
步骤二、补光步骤,开启灯,进行补光。
在本实施例中,所述开灯步骤还包括位于步骤一获取图像传感器增益值步骤与步骤二补光步骤之间的获取数据步骤,读取当前的影像图片亮度以及图像传感器增益值。
另外,在所述步骤一获取图像传感器增益值步骤,包括以下具体步骤:
步骤1、获取影像图片亮度步骤,图像传感器实时获取摄像装置所处环境的图像数据,所述图像数据为YUV数据形式的图像数据,Y代表影像图片亮度,UV代表色度;
步骤2、获取图像数据步骤,数字信号处理器获取图像数据缓存在源缓冲区的数据;
步骤3、确定影像图片亮度步骤,影像传感器驱动上的API接口直接从源缓冲区中获取一帧图像的ME数据,ME数据是只含有Y分量的数据,取得Y值后取平均值来确定当前影像图片亮度,同时读取所设定的影像图片亮度目标值;
步骤4、获取当前自动曝光的传感器增益值,自动曝光的时候会自动调影像传感器的增益值与曝光时间
更进一步的,所述步骤一获取图像传感器增益值步骤还包括位于获取数据步骤与补光步骤之间的补偿步骤,对图像传感器增益值进行补偿。
具体的,上述的补偿步骤的补偿依据如下:AE跑的时候目标亮度会有一定的范围,比如100至120都算是达标亮度,而在同样的外界亮度环境下,图像亮度值在达标亮度的下限时,图像传感器增益值小,而图像亮度值在达标亮度的上限值时图像传感器增益值会高一些,为了使图像传感器增益值与环境亮度值对应
当亮度接近达标亮度的上下限时需要对图像传感器增益值进行补偿,具体补偿多少与实测数据有关,依据实际情况而定。
在本实施例中,所述关灯步骤包括以下具体步骤:
步骤一、记录步骤,记录当前的光敏传感器信号值,作为开启灯时的光敏信号值;
步骤二、计算步骤,计算关闭灯时的光敏传感器信号值以及关闭灯时的图像传感器增益值;
步骤三、第二判断步骤,判断图像传感器增益值是否大于关闭灯时的图像传感器增益值,若图像传感器增益值不大于关闭灯时的图像传感器增益值,则进行第三判断步骤;若图像传感器增益值大于关闭灯时的图像传感器增益值;则进行记录步骤;
步骤四、第三判断步骤,判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,若当前的光敏传感器信号值大于关闭灯时的光敏传感器信号值,进行关闭步骤;若当前的光敏传感器信号值不大于关闭灯时的光敏传感器信号值,则进行确定影像图片亮度步骤;
步骤五、关闭步骤,关闭灯。
上述的第二判断步骤包括以下具体步骤:
步骤1、夜视状态判断步骤,判断当前是否进入夜视状态,若当前进入夜视状态,则进行第三判断步骤,若当前不是进入夜视状态,进行图像传感器增益值判断步骤;
步骤2、图像传感器增益值判断步骤,判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,若当前的图像传感器增益值大于关闭灯时的图像传感器增益值,则进行进入夜视次数处理步骤,若当前的图像传感器增益值不大于关闭灯时的图像传感器增益值,则重复确定影像图片亮度步骤;
步骤3、进入夜视次数处理步骤,进入夜视的次数加多一次;
步骤4、进入夜视次数判断步骤,判断进入夜视的次数是否大于设定的次数,若进入夜视的次数不大于设定的次数,则进行确定影像图片亮度步骤,若进入夜视的次数大于设定的次数,则设定进入夜视次数为零次,打开灯,同时设定摄像装置的拍摄模式为黑白模式,并且等待光敏传感器信号值稳定后,进行记录步骤。
上述的步骤四第三判断步骤,包括以下具体步骤:
步骤1、影像图片亮度值判断步骤,判断当前的影像图片亮度值是否大于影像图片目标上限值,若当前的影像图片亮度值大于影像图片目标上限值,则等待影像图片亮度值稳定后,重复获取影像图片亮度值步骤,若当前的影像图片亮度值不大于影像图片目标上限值,则进行判断步骤;
步骤2、判断步骤,判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,若当前的图像传感器增益值不大于关闭灯时的图像传感器增益值,则设定退出夜视的次数等于零次;若当前的图像传感器增益值大于关闭灯时的图像传感器增益值,则进行信号值判断步骤;
步骤3、信号值判断步骤,判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,若当前的光敏传感器信号值大于关闭灯时的光敏传感器信号值,进行退出夜视次数处理步骤,若当前的光敏传感器信号值不大于关闭灯时的光敏传感器信号值,则进行设定退出夜视的次数等于零次,并进入确定影像图片亮度步骤;
步骤4、退出夜视次数处理步骤,退出夜视的次数加多一次;
步骤5、退出夜视次数判断步骤,判断退出夜视的次数是否大于设定的次数,若退出夜视的次数不大于设定的次数,设定退出夜视的次数等于零次,进行确定影像图片亮度步骤,若夜视的次数退出大于设定的次数,则进行关闭步骤,同时设定摄像装置的拍摄模式为彩色模式,设定退出夜视的次数等于零次,进行确定影像图片亮度步骤。
对于上述的步骤1影像图片亮度值判断步骤,等灯稳定再记录光敏传感器信号值,这时候就会把灯反射光对影像的影响评估进去。
在本实施例中,根据影像图片亮度值判定图像传感器增益值是否准确,主要的目的是防止当出现光照亮度很低,图像传感器增益值没有拉上来的而环境光照亮度已经变暗的情况出现误判。
在本实施例中,光敏传感器为光敏电阻,当然,于其他实施例,上述光敏传感器可以为光敏二极管等感光器件。
更进一步的,光敏传感器信号值指的是光敏传感器ADC值。
在所述计算步骤中,采用ADC_off = ADC_on + ADC_diff +
Gain_diff的计算方式计算关闭灯时的光敏传感器信号值以及关闭灯时的光照亮度判断图像传感器增益值,其中ADC_off
表示需要关闭灯的时候光敏传感器的信号值, ADC_on 表示开启灯时记录的光敏传感器的信号值,ADC_diff
表示开灯与关灯的光敏传感器ADC阀门值,即预设的开关灯时,光敏传感器的ADC差异值,其中ADC_Diff,
Gain_diff表示开灯与关灯的图像传感器增益值的阀门值。
更进一步的,关闭灯时的光敏传感器信号值以及关闭灯时的图像传感器增益值的计算方法是收集开启夜视与关闭夜视的光敏传感器信号值的差异值。
参照图4至图6,不同的光敏传感器对温度的反应程度不一样,不同的光敏传感器对光的敏感程度也不一样,所以光敏传感器信号值都会有差异,图4是对5台对同一光源不同温度的光敏传感器ADC测试值,因为只有在IR灯开启的时候使用到光敏传感器;而图5是不同的温度区间机台光敏传感器的变化斜率,结果得出不同的温度不同的机台斜率也不一致。
更进一步的,上述的ADC_diff的计算可以参照以下方式:
ADC_diff=((ADC_cali)*((LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX*10)/
LIGHT_SENSOR_CALI_LUX)/10;
其中LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX是关闭夜视的环境光照亮度值。LIGHT_SENSOR_CALI_LUX生产校正时的环境光照亮度值。
当然,于其他实施例,上述的ADC_diff的计算可以采用其他方式。
在计算ADC_diff的时候,如果机台单体差异性不大可以设定成一个固定值ADC_thd或者是ADC_thd
*(ADC_on/ADC_on_std),差异性大的时候需要在生产的时候在LIGHT_SENSOR_CALI_LUX =
5lux的光源环境下进行校正,记录每一台在5lux的光源下的信号值ADC_cali,以作计算ADC_diff所用,然后再计算此值与标准值的斜率,从而得到更接近本机台的数据。
在本实施例中,若当前拍摄装置处于白天模式,则以图像传感器的判定为准,光敏传感器不参与判定;若当前拍摄装置处于晚上模式,则以光敏传感器的判定为主,图像传感器的判定为辅。
在本实施例中,所述的灯为红外灯,当然,于其他实施例,上述的灯还可以为其他补光灯。
本实施例还提供了用于监控摄像装置的夜视切换***,开灯单元以及关灯单元,所述开灯单元包括所述获取增益值模块、获取数据模块20、补偿模块30以及补光模块40,所述关灯单元包括记录模块50、计算模块60、第二判断模块、第三判断模块以及关闭模块70;所述获取增益值模块,用于图像传感器获取摄像装置所处环境的图像,图像传感器内的数字信号处理器获取拍摄的图像后分析得出当前环境的图像传感器增益值;获取数据模块20,用于读取当前的影像图片亮度以及图像传感器增益值,与所述所述获取增益值模块连接;补偿模块30,用于对图像传感器增益值进行补偿,与所述获取数据模块20连接;补光模块40,用于开启灯,进行补光,与所述补偿判断模块30连接;记录模块50,用于记录当前的光敏传感器信号值,作为开启灯时的光敏信号值,与所述补光模块40连接;计算模块60,用于根据开启灯时的光敏传感器信号值计算关闭灯时的光敏传感器信号值以及关闭灯时的光照亮度判断图像传感器增益值,与所述记录模块50连接;第二判断模块,用于判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,分别与所述计算模块60以及记录模块50连接;第三判断模块,用于判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,分别与所述第二判断模块以及所述获取增益值模块连接;关闭模块70,用于关闭灯,与所述第三判断模块连接。
上述的补偿模块30的补偿依据如下:AE跑的时候目标亮度会有一定的范围,比如100至120都算是达标亮度,而在同样的外界亮度环境下,图像亮度值在达标亮度的下限时,图像传感器增益值小,而图像亮度值在达标亮度的上限值时图像传感器增益值会高一些,为了使图像传感器增益值与环境亮度值对应
当亮度接近达标亮度的上下限时需要对图像传感器增益值进行补偿,具体补偿多少与实测数据有关,依据实际情况而定。
另外,所述计算模块60是采用ADC_off = ADC_on + ADC_diff +
Gain_diff的计算方式计算关闭灯时的光敏传感器信号值以及关闭灯时的光照亮度判断图像传感器增益值,其中ADC_off
表示需要关闭灯的时候光敏传感器的信号值,ADC_on表示开启灯时记录的光敏传感器的信号值,ADC_diff
表示开灯与关灯的光敏传感器ADC阀门值,即预设的开关灯时,光敏传感器的ADC差异值, Gain_diff表示开灯与关灯的图像传感器增益值的阀门值。
上述的ADC_diff的计算可以参照以下方式:
ADC_diff=((ADC_cali)*((LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX*10)/
LIGHT_SENSOR_CALI_LUX)/10;
其中LIGHT_SENSOR_DAY_NIGHT_DIFF_LUX是关闭夜视的环境光照亮度值。LIGHT_SENSOR_CALI_LUX生产校正时的环境光照亮度值。
在计算ADC_diff的时候,如果机台单体差异性不大可以设定成一个固定值ADC_thd或者是ADC_thd
*(ADC_on/ADC_on_std),差异性大的时候需要在生产的时候在LIGHT_SENSOR_CALI_LUX =
5lux的光源环境下进行校正,记录每一台在5lux的光源下的信号值ADC_cali,以作计算ADC_diff所用,然后再计算此值与标准值的斜率,从而得到更接近本机台的数据。
另外,在本实施例中,所述获取增益值模块包括获取影像图片亮度子模块10、获取图像数据子模块11以及确定影像图片亮度子模块12以及获取曝光增益值子模块13;所述获取影像图片亮度子模块10,用于图像传感器实时获取摄像装置所处环境的图像数据,与所述获取图像数据子模块11连接;获取图像数据子模块11,用于数字信号处理器获取图像数据缓存在源缓冲区的数据,与所述确定影像图片亮度子模块12连接;所述确定影像图片亮度子模块12,用于影像传感器驱动上的API接口直接从源缓冲区中获取一帧图像的ME数据,ME数据是只含有Y分量的数据,取得Y值后取平均值来确定当前影像图片亮度,同时读取所设定的影像图片亮度目标值,与所述获取曝光增益值子模块连接;
所述获取曝光增益值子模块13,用于获取当前自动曝光的传感器增益值,自动曝光的时候会自动调影像传感器的增益值与曝光时间,与所述获取数据模块20连接。
另外,所述第二判断模块包括夜视状态判断子模块91、传感器增益值判断子模块92、进入夜视次数处理子模块93以及进入夜视次数判断子模块94。
其中,夜视状态判断子模块91,用于判断当前是否进入夜视状态,分别与所述计算模块60以及所述传感器增益值判断子模块92连接;所述传感器增益值判断子模块92,用于判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,分别与所述进入夜视次数处理子模块93以及确定影像图片亮度子模块12连接;所述进入夜视次数处理子模块93,用于进入夜视的次数加多一次,与所述进入夜视次数判断子模块94连接;所述进入夜视次数判断子模块94,用于判断进入夜视的次数是否大于设定的次数,分别与确定影像图片亮度子模块12、关闭模块70以及记录模块50连接。
所述第三判断模块包括影像图片亮度值判断子模块80、判断子模块81、信号值判断子模块82、退出夜视次数处理子模块83以及退出夜视次数判断子模块84;
所述影像图片亮度值判断子模块80,用于判断影像图片亮度值是否大于影像图片目标上限值,与所述确定影像图片亮度子模块12以及所述判断子模块81连接;所述判断子模块81,用于判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,分别与关闭模块70以及信号值判断子模块82连接;信号值判断子模块82,用于判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,分别与所述退出夜视次数处理子模块83以及所述确定影像图片亮度子模块12连接;所述退出夜视次数处理子模块83,用于退出夜视的次数加多一次,与所述退出夜视次数判断子模块84连接;所述退出夜视次数判断子模块84连接,用于判断退出夜视的次数是否大于设定的次数,分别与确定影像图片亮度子模块12以及关闭模块70连接。
上述仅以实施例来进一步说明本发明的技术内容,以便于读者更容易理解,但不代表本发明的实施方式仅限于此,任何依本发明所做的技术延伸或再创造,均受本发明的保护。本发明的保护范围以权利要求书为准。
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- 用于监控摄像装置的夜视切换方法,其特征在于,包括以下具体步骤:开灯步骤,通过图像传感器获取当前图像传感器的增益值,当前的图像传感器的增益值高于设定值时,开启灯。关灯步骤,通过光敏传感器获取在光补偿情况下光敏传感器的信号值,在光补偿情况下光敏传感器的信号值高于关灯时的光敏传感器的信号值,关闭灯。
- 根据权利要求1所述的用于监控摄像装置的夜视切换方法,其特征在于,所述开灯步骤包括以下具体步骤:步骤一、获取当前图像传感器增益值步骤,图像传感器获取摄像装置所处环境的图像,图像传感器内的数字信号处理器获取拍摄的图像后分析得出当前环境的图像传感器增益值;步骤二、补光步骤,开启灯,进行补光。
- 根据权利要求2所述的用于监控摄像装置的夜视切换方法,其特征在于,所述开灯步骤还包括位于步骤一获取图像传感器增益值步骤与步骤二补光步骤之间的获取数据步骤,读取当前的影像图片亮度以及图像传感器增益值。
- 根据权利要求3所述的用于监控摄像装置的夜视切换方法,其特征在于,在所述步骤一获取影像图片亮度步骤,包括以下具体步骤:步骤1、获取影像图片亮度步骤,图像传感器实时获取摄像装置所处环境的图像数据,所述图像数据为YUV数据形式的图像数据,Y代表影像图片亮度,UV代表色度;步骤2、获取图像数据步骤,数字信号处理器获取图像数据缓存在源缓冲区的数据;步骤3、确定影像图片亮度步骤,影像传感器驱动上的API接口直接从源缓冲区中获取一帧图像的ME数据,ME数据是只含有Y分量的数据,取得Y值后取平均值来确定当前影像图片亮度,同时读取所设定的影像图片亮度目标值;步骤4、获取当前自动曝光的传感器增益值,自动曝光的时候会自动调影像传感器的增益值与曝光时间。
- 根据权利要求3所述的用于监控摄像装置的夜视切换方法,其特征在于,所述步骤一获取图像传感器增益值步骤还包括位于获取数据步骤与补光步骤之间的补偿步骤,对图像传感器增益值进行补偿。
- 根据权利要求1至5任一项所述的用于监控摄像装置的夜视切换方法,其特征在于,所述关灯步骤包括以下具体步骤:步骤一、记录步骤,记录当前的光敏传感器信号值,作为开启灯时的光敏信号值;步骤二、计算步骤,计算关闭灯时的光敏传感器信号值以及关闭灯时的图像传感器增益值;步骤三、第二判断步骤,判断图像传感器增益值是否大于关闭灯时的图像传感器增益值,若图像传感器增益值不大于关闭灯时的图像传感器增益值,则进行第三判断步骤;若图像传感器增益值大于关闭灯时的图像传感器增益值;则进行记录步骤;步骤四、第三判断步骤,判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,若当前的光敏传感器信号值大于关闭灯时的光敏传感器信号值,进行关闭步骤;若当前的光敏传感器信号值不大于关闭灯时的光敏传感器信号值,则进行确定影像图片亮度步骤;步骤五、关闭步骤,关闭灯。
- 根据权利要求6所述的用于监控摄像装置的夜视切换方法,其特征在于,所述第二判断步骤包括以下具体步骤:步骤1、夜视状态判断步骤,判断当前是否进入夜视状态,若当前进入夜视状态,则进行第三判断步骤,若当前不是进入夜视状态,进行图像传感器增益值判断步骤;步骤2、图像传感器增益值判断步骤,判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,若当前的图像传感器增益值大于关闭灯时的图像传感器增益值,则进行进入夜视次数处理步骤,若当前的图像传感器增益值不大于关闭灯时的图像传感器增益值,则重复确定影像图片亮度步骤;步骤3、进入夜视次数处理步骤,进入夜视的次数加多一次;步骤4、进入夜视次数判断步骤,判断进入夜视的次数是否大于设定的次数,若进入夜视的次数不大于设定的次数,则进行确定影像图片亮度步骤,若进入夜视的次数大于设定的次数,则设定进入夜视次数为零次,打开灯,同时设定摄像装置的拍摄模式为黑白模式,并且等待光敏传感器信号值稳定后,进行记录步骤。
- 根据权利要求7所述的用于监控摄像装置的夜视切换方法,其特征在于,所述第三判断步骤包括以下具体步骤:步骤1、影像图片亮度值判断步骤,判断当前的影像图片亮度值是否大于影像图片目标上限值,若当前的影像图片亮度值大于影像图片目标上限值,则等待影像图片亮度值稳定后,重复获取影像图片亮度值步骤,若当前的影像图片亮度值不大于影像图片目标上限值,则进行判断步骤;步骤2、判断步骤,判断当前的图像传感器增益值是否大于关闭灯时的图像传感器增益值,若当前的图像传感器增益值不大于关闭灯时的图像传感器增益值,则设定退出夜视的次数等于零次;若当前的图像传感器增益值大于关闭灯时的图像传感器增益值,则进行信号值判断步骤;步骤3、信号值判断步骤,判断当前的光敏传感器信号值是否大于关闭灯时的光敏传感器信号值,若当前的光敏传感器信号值大于关闭灯时的光敏传感器信号值,进行退出夜视次数处理步骤,若当前的光敏传感器信号值不大于关闭灯时的光敏传感器信号值,则进行设定退出夜视的次数等于零次,并进入确定影像图片亮度步骤;步骤4、退出夜视次数处理步骤,退出夜视的次数加多一次;步骤5、退出夜视次数判断步骤,判断退出夜视的次数是否大于设定的次数,若退出夜视的次数不大于设定的次数,设定退出夜视的次数等于零次,进行确定影像图片亮度步骤,若夜视的次数退出大于设定的次数,则进行关闭步骤,同时设定摄像装置的拍摄模式为彩色模式,设定退出夜视的次数等于零次,进行确定影像图片亮度步骤。
- 用于监控摄像装置的夜视切换***,其特征在于,包括开灯单元以及关灯单元,所述开灯单元包括获取增益值模块、获取数据模块、补偿模块以及补光模块;所述关灯单元包括记录模块、计算模块、第二判断模块、第三判断模块以及关闭模块;所述获取增益值模块,用于图像传感器获取摄像装置所处环境的图像,图像传感器内的数字信号处理器获取拍摄的图像后分析得出当前环境的图像传感器增益值;所述获取数据模块,用于读取当前的影像图片亮度以及传感器增益值,与所述获取增益值模块连接;所述补偿模块,用于对图像传感器增益值进行补偿,与所述获取数据模块连接;所述补光模块,用于开启红外灯,进行补光,与所述补偿模块连接;所述记录模块,用于记录当前的光敏传感器信号值,作为开启灯时的光敏信号值,与所述补光模块连接;所述计算模块,用于根据开启红外灯时的光敏传感器信号值计算关闭红外灯时的光敏传感器信号值以及关闭红外灯时的光照亮度判断传感器增益值,与所述记录模块连接;所述第二判断模块,用于判断当前的传感器增益值是否大于关闭红外灯时的传感器增益值,分别与所述计算模块以及所述记录模块连接;所述第三判断模块,用于判断当前的光敏传感器信号值是否大于关闭红外灯时的光敏传感器信号值,分别与所述第二判断模块以及所述确定影像图片亮度模块连接;所述关闭模块,用于关闭红外灯,与所述第三判断模块连接。
- 根据权利要求9所述的用于监控摄像装置的夜视切换***,其特征在于,所述确定影像图片亮度模块包括获取影像图片亮度子模块、获取图像数据子模块、确定影像图片亮度子模块以及所述获取曝光增益值子模块;所述获取影像图片亮度子模块,用于图像传感器实时获取摄像装置所处环境的图像数据,与所述获取图像数据子模块连接;所述获取图像数据子模块,用于数字信号处理器获取图像数据缓存在源缓冲区的数据,与所述确定影像图片亮度子模块连接;所述确定影像图片亮度子模块,用于影像传感器驱动上的API接口直接从源缓冲区中获取一帧图像的ME数据,ME数据是只含有Y分量的数据,取得Y值后取平均值来确定当前影像图片亮度,同时读取所设定的影像图片亮度目标值,与所述获取曝光增益值子模块连接;所述获取曝光增益值子模块,用于获取当前自动曝光的传感器增益值,自动曝光的时候会自动调影像传感器的增益值与曝光时间,与所述获取数据模块连接。
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