CN105554409B - A kind of method and apparatus of change detection round the clock - Google Patents
A kind of method and apparatus of change detection round the clock Download PDFInfo
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- CN105554409B CN105554409B CN201510943460.2A CN201510943460A CN105554409B CN 105554409 B CN105554409 B CN 105554409B CN 201510943460 A CN201510943460 A CN 201510943460A CN 105554409 B CN105554409 B CN 105554409B
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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
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The present invention provides a kind of method and apparatus of change detection round the clock, and this method includes：The first interval of intensity of illumination is determined, change detection round the clock is carried out in first interval；When detecting that current light intensity is not located at first interval, the light filling brightness of infrared lamp is adjusted；When the light filling brightness of infrared lamp changes, judge whether the change direction of this light filling brightness is consistent with the change direction of the light filling brightness of last time, if not, renewal adjusts number repeatedly；Judge whether the current number of regulation repeatedly reaches predetermined threshold value, if it is, determining the second interval of intensity of illumination using first interval, and change detection round the clock is carried out in second interval；The maximum illumination intensity value of second interval is more than the maximum illumination intensity value of first interval, and the minimum illumination intensity value of second interval is less than the minimum illumination intensity value of first interval.By technical scheme, solves caused by headend equipment itself infrared lamp round the clock switching problem repeatedly, it is ensured that the normal use of headend equipment.
Description
Technical Field
The invention relates to the technical field of videos, in particular to a day and night switching detection method and device.
Background
The day-night switching is a basic function of front-end equipment (such as an analog camera, a network camera, an encoder, and the like), and is generally required to have the following effects: when the illumination intensity (illumination for short) of the environment is high, starting an IR (infrared) filter to filter infrared light in the environment; when the illumination intensity of the environment is low, the IR filter is removed, infrared light in the environment is received, and an infrared lamp of the front-end equipment is turned on, so that the illumination intensity of the environment is greatly improved. Furthermore, the front-end equipment can automatically start the IR filter when the illumination intensity is higher by acquiring the illumination intensity, automatically remove the IR filter when the illumination intensity is lower, and turn on an infrared lamp carried by the front-end equipment, so that automatic day and night switching is realized.
However, during automatic day-night switching, as the environment becomes dark and the light intensity is low, the front-end equipment automatically removes the IR filter and turns on the infrared lamp. In some environments where the scene is small or the reflection is strong, once the infrared lamp is turned on, the illumination intensity may become high, causing the front-end device to activate the IR filter and turn off the infrared lamp. After the infrared lamp is turned off, the illumination intensity becomes low again, the IR filter can be automatically removed by the front-end equipment, the infrared lamp is turned on, and the image effect and the user experience are greatly influenced by repeated processing.
Disclosure of Invention
The invention provides a method for detecting day-night switching, which comprises the following steps:
determining a first interval of illumination intensity, and carrying out day-night switching detection in the first interval;
when detecting that the current illumination intensity is not in the first interval, adjusting the fill-in brightness of the infrared lamp;
when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times;
judging whether the current repeated adjustment times reach a preset threshold value, if so, determining a second interval of the illumination intensity by using the first interval, and carrying out day-night switching detection in the second interval;
the maximum illumination intensity value of the second interval is greater than that of the first interval, and the minimum illumination intensity value of the second interval is less than that of the first interval.
When detecting that current illumination intensity is not located when first interval, the process of adjustment infrared lamp's light filling luminance specifically includes:
aiming at the process of carrying out day and night switching detection in the first interval, when the current illumination intensity is detected to be smaller than the minimum illumination intensity value in the first interval, the supplementary illumination brightness of the infrared lamp is increased; and when the current illumination intensity is detected to be greater than the maximum illumination intensity value of the first interval, the supplementary illumination brightness of the infrared lamp is reduced.
The process of determining whether the change direction of the luminance of the current supplementary lighting is consistent with the change direction of the luminance of the last supplementary lighting includes: if the change direction of the luminance of the current supplementary lighting is obtained to be the supplementary lighting luminance of the infrared lamp, and the change direction of the luminance of the previous supplementary lighting is obtained to be the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is consistent with the change direction of the luminance of the previous supplementary lighting; or if it is known that the change direction of the luminance of the current supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or if the change direction of the luminance of the current supplementary lighting is known to be the reduction of the supplementary lighting luminance of the infrared lamp, and the change direction of the luminance of the last supplementary lighting is known to be the increase of the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or, if it is known that the change direction of the luminance of the current supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, it is determined that the change direction of the luminance of the current supplementary lighting is the same as the change direction of the luminance of the last supplementary lighting.
The process of determining the second interval of the illumination intensity by using the first interval specifically includes:
determining a third interval of the illumination intensity, so that the detected illumination intensity is always positioned in the third interval when the day-night switching detection is carried out in the third interval; determining the current illumination intensity after the time for performing the diurnal switching detection using the third interval has continued for a set time;
determining the illumination intensity tolerance value as (the current illumination intensity-average brightness value) + a set value, wherein the average brightness value is (the maximum illumination intensity value in the first interval + the minimum illumination intensity value in the first interval)/2;
and determining the maximum illumination intensity value of the second interval as the sum of the average brightness value and the illumination intensity tolerance value, and determining the minimum illumination intensity value of the second interval as the difference between the average brightness value and the illumination intensity tolerance value.
The method further comprises: aiming at the process of carrying out day and night switching detection in the second interval, when detecting that the current illumination intensity is not in the second interval, judging whether the infrared lamp is in a closed state;
if the infrared lamp is in the off state, the day-night switching detection in the first interval is resumed;
if the infrared lamp is not in the closed state, when the current illumination intensity is detected not to be in the second interval, adjusting the light supplement brightness of the infrared lamp; when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times; and judging whether the current repeated adjustment times reach a preset threshold value, if so, re-determining a second interval of the illumination intensity, and carrying out day-night switching detection in the second interval.
The invention provides a day and night switching detection device, which specifically comprises:
the infrared repeated detection module is used for determining a first interval of the illumination intensity and carrying out day-night switching detection in the first interval; when detecting that the current illumination intensity is not in the first interval, adjusting the fill-in brightness of the infrared lamp; when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times; judging whether the current repeated adjustment times reach a preset threshold value, if so, informing a brightness tolerance module to determine a second interval;
the brightness tolerance module is used for determining a second interval of the illumination intensity by using the first interval after receiving the notification from the infrared repeated detection module, and carrying out day-night switching detection in the second interval;
the maximum illumination intensity value of the second interval is greater than that of the first interval, and the minimum illumination intensity value of the second interval is less than that of the first interval.
The infrared repeated detection module is specifically configured to, in a process of adjusting the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is not in the first interval, perform day-night switching detection in the first interval, and increase the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is smaller than the minimum illumination intensity value in the first interval; and when the current illumination intensity is detected to be greater than the maximum illumination intensity value of the first interval, reducing the fill-in illumination brightness of the infrared lamp.
The infrared repeated detection module is specifically configured to, in a process of determining whether a change direction of luminance of this supplementary lighting is consistent with a change direction of luminance of previous supplementary lighting, determine that the change direction of luminance of this supplementary lighting is consistent with the change direction of luminance of previous supplementary lighting if it is known that the change direction of luminance of this supplementary lighting is to increase luminance of the infrared lamp and the change direction of luminance of previous supplementary lighting is to increase luminance of the infrared lamp; or if it is known that the change direction of the luminance of the current supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or if it is known that the change direction of the luminance of the current supplementary lighting is to reduce the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or, if it is known that the change direction of the luminance of the current supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, it is determined that the change direction of the luminance of the current supplementary lighting is the same as the change direction of the luminance of the last supplementary lighting.
The brightness tolerance module is specifically used for determining a third interval of the illumination intensity in the process of determining a second interval of the illumination intensity by using the first interval, so that the detected illumination intensity is always positioned in the third interval when the day-night switching detection is carried out in the third interval; determining the current illumination intensity after the time for performing the diurnal switching detection using the third interval has continued for a set time; determining the illumination intensity tolerance value as (the current illumination intensity-average brightness value) + a set value, wherein the average brightness value is (the maximum illumination intensity value in the first interval + the minimum illumination intensity value in the first interval)/2; and determining the maximum illumination intensity value of the second interval as the sum of the average brightness value and the illumination intensity tolerance value, and determining the minimum illumination intensity value of the second interval as the difference between the average brightness value and the illumination intensity tolerance value.
The brightness tolerance module is also used for carrying out day and night switching detection in the second interval, and judging whether the infrared lamp is in a closed state or not when detecting that the current illumination intensity is not in the second interval; if the infrared lamp is in the off state, the day-night switching detection in the first interval is resumed; and if the infrared lamp is not in the off state, informing the infrared repeated detection module to redetermine a second interval of the illumination intensity.
Based on the technical scheme, in the embodiment of the invention, in the automatic day and night switching process, when the situation that the fill-in brightness of the infrared lamp changes repeatedly occurs, the front-end equipment can find the situation in time, adjust the first interval corresponding to the illumination intensity into the second interval, and perform day and night switching detection in the second interval. Because the maximum illumination intensity value between the second interval is greater than the maximum illumination intensity value between the first interval, the minimum illumination intensity value between the second interval is less than the minimum illumination intensity value between the first interval, consequently even current illumination intensity when not being located between the first interval, also can be located between the second interval to solve the problem of the repeated switching round the clock that leads to because of front-end equipment self infrared lamp, can satisfy the switching requirement round the clock of each scene, ensure the normal use of front-end equipment.
Drawings
FIG. 1 is a flow chart of a method of circadian switch detection in one embodiment of the invention;
FIG. 2 is a diagram illustrating a luminance relationship diagram according to an embodiment of the present invention;
FIG. 3 is a schematic illustration of exposure control in one embodiment of the present invention;
FIG. 4 is a diagram illustrating a diurnal switching threshold determination model according to an embodiment of the present invention;
FIG. 5 is a hardware block diagram of a head end device in one embodiment of the invention;
FIG. 6 is a block diagram of a device for day-night switch detection in one embodiment of the present invention.
Detailed Description
In view of the problems in the prior art, an embodiment of the present invention provides a method for detecting a day-night switching, which can be applied to a front-end device (such as an analog camera, a web camera, an encoder, etc.) of a video monitoring system, and as shown in fig. 1, the method specifically includes the following steps:
step 101, determining a first interval of illumination intensity, and carrying out day-night switching detection in the first interval.
And 102, aiming at the process of carrying out day and night switching detection in the first interval, when detecting that the current illumination intensity is not in the first interval, adjusting the supplementary illumination brightness of the infrared lamp.
In the embodiment of the present invention, when detecting that the current illumination intensity is not in the first interval, the process of adjusting the fill-in luminance of the infrared lamp may specifically include, but is not limited to, the following manners: when the current illumination intensity is detected to be smaller than the minimum illumination intensity value in the first interval, the supplementary illumination brightness of the infrared lamp is increased; and when the current illumination intensity is detected to be greater than the maximum illumination intensity value of the first interval, the supplementary illumination brightness of the infrared lamp is reduced.
The first interval may be [ illumination intensity value 1, illumination intensity value 2], where illumination intensity value 1 is the minimum illumination intensity value of the first interval, and illumination intensity value 2 is the maximum illumination intensity value of the first interval.
In practical application, the first interval, which is the interval used by the existing front-end equipment for carrying out the diurnal switching detection, can be arbitrarily set according to actual needs. For example, when the illumination intensity of the environment is high (i.e., greater than the illumination intensity value 2), the front-end device activates the IR filter to filter the infrared light in the environment; when the illumination intensity of the environment is low (i.e. less than the illumination intensity value 1), the front-end device removes the IR filter, receives the infrared light in the environment, and turns on the infrared lamp of the front-end device.
In the embodiment of the invention, in the process of switching and detecting day and night in the first interval, when the current illumination intensity is detected to be smaller than the minimum illumination intensity value in the first interval, the fill-in luminance of the infrared lamp is increased, specifically, when the infrared lamp is turned off, the infrared lamp can be turned on by the front-end equipment, and when the infrared lamp is turned on and the fill-in luminance of the infrared lamp is lower, the fill-in luminance can be increased by the front-end equipment. Or when detecting that the current illumination intensity is greater than the maximum illumination intensity value in the first interval, the fill-in luminance of the infrared lamp is reduced, and specifically, the front-end device may reduce the fill-in luminance of the infrared lamp or turn off the infrared lamp.
103, when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time; if not, updating the repeated adjustment times (such as adjusting the counter + 1); if yes, the repeated adjustment times of the adjustment counter are cleared to 0.
In the embodiment of the present invention, the process of determining whether the change direction of the current fill-in luminance is consistent with the change direction of the previous fill-in luminance may specifically include, but is not limited to, the following manners: if the change direction of the light supplement brightness at this time is obtained as the light supplement brightness of the infrared lamp is increased, and the change direction of the light supplement brightness at the last time is obtained as the light supplement brightness of the infrared lamp is increased, the front-end equipment determines that the change direction of the light supplement brightness at this time is consistent with the change direction of the light supplement brightness at the last time; or if it is known that the change direction of the luminance of the current supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, the front-end device determines that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or if it is known that the change direction of the luminance of the current supplementary lighting is to reduce the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp, the front-end device determines that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or, if it is known that the change direction of the luminance of the current supplementary lighting is to decrease the luminance of the infrared lamp, and the change direction of the luminance of the last supplementary lighting is to decrease the luminance of the infrared lamp, the front-end device determines that the change direction of the luminance of the current supplementary lighting is the same as the change direction of the luminance of the last supplementary lighting.
Specifically, the front-end equipment carries out the in-process that switches over the detection round clock in the first interval, and the light filling luminance that detects the infrared lamp at every turn changes, if current illumination intensity is less than the increase light filling luminance that the minimum illumination intensity value in first interval leads to, perhaps current illumination intensity is greater than the reduction light filling luminance that the maximum illumination intensity value in first interval leads to, all can judge this light filling luminance's change direction and last light filling luminance's change direction unanimous, then to adjust counter +1 or will adjust the counter clear 0.
The front-end device also monitors the repeated adjustment times (i.e. the value of the adjustment counter) in real time during the day-night switching detection in the first interval, and executes step 104 when the repeated adjustment times reach a preset threshold N. The preset threshold N is the number of times that the fill-in light brightness of the infrared lamp can be tolerated by the front-end device changes repeatedly, and the value of the preset threshold N can be set according to practical experience, and can be small but is not suitable to be large, such as the value of the preset threshold N is 5. Further, when the number of times of the repeated adjustment reaches the preset threshold N, the number of times of the repeated adjustment of the adjustment counter may be cleared to 0, so as to avoid interfering with the next determination.
The reason that the fill light brightness of the infrared lamp changes repeatedly in the automatic day and night switching process is considered as follows: the influence of the infrared lamp of the front-end equipment on automatic day and night switching is influenced by the infrared lamp of the front-end equipment, so that the measured illumination intensity of the current environment is deviated, and the switching is repeated between the minimum illumination intensity value smaller than the first interval and the maximum illumination intensity value larger than the first interval. Therefore, to solve the problem that the fill-in luminance of the infrared lamp repeatedly changes, it is first detected whether the reason why the fill-in luminance of the infrared lamp repeatedly changes is influenced by the infrared lamp of the front-end device itself. Based on this, in the embodiment of the present invention, each time the change of the fill-in luminance of the infrared lamp is detected, it is determined whether the change direction of the fill-in luminance of this time is consistent with the change direction of the fill-in luminance of the last time, and then the adjustment counter +1 is cleared or the adjustment counter is cleared by 0, when the number of times of the repeated adjustment reaches the preset threshold N, it is determined that the reason why the fill-in luminance of the infrared lamp is repeatedly changed is influenced by the infrared lamp of the front-end device itself, and the subsequent steps are executed to avoid the influence of the infrared lamp of the front-end device itself, and then the problem that the fill-in luminance of the infrared lamp is repeatedly.
In an example, for each time the fill-in luminance of the infrared lamp is detected to change, whether the change direction of the fill-in luminance of this time is consistent with the change direction of the fill-in luminance of the last time is judged, and then the following steps may be performed in the process of adjusting the counter +1 or clearing the counter 0:
step 1, the front-end equipment detects that the current illumination intensity is not in a first interval. If the current illumination intensity is detected to be larger than the maximum illumination intensity value of the first interval, executing the step 2; if the current illumination intensity is detected to be less than the minimum illumination intensity value of the first interval, step 5 is executed.
And 2, reducing the fill-in luminance of the infrared lamp by the front-end equipment, and judging whether the change direction of the fill-in luminance of the last time is to increase the fill-in luminance of the infrared lamp. If yes, the front-end equipment can execute the step 3; if not, the front-end device may directly clear the adjustment counter by 0, and return to step 1.
Step 3, the front-end equipment determines that the change direction of the light supplement brightness at this time is inconsistent with the change direction of the light supplement brightness at the last time, adjusts the counter +1 and judges whether the numerical value of the adjustment counter reaches a preset threshold value N or not; if yes, the front-end equipment executes the step 4; if not, returning to the step 1.
And 4, clearing 0 by the front-end equipment for the repeated adjustment times of the adjustment counter, and executing step 104.
And 5, increasing the fill-in luminance of the infrared lamp by the front-end equipment, and judging whether the change direction of the fill-in luminance of the previous time is to reduce the fill-in luminance of the infrared lamp. If yes, the front-end equipment can execute the step 6; if not, the front-end device may directly clear the adjustment counter by 0, and return to step 1.
Step 6, the front-end equipment determines that the change direction of the light supplement brightness at this time is inconsistent with the change direction of the light supplement brightness at the last time, adjusts the counter +1 and judges whether the numerical value of the adjustment counter reaches a preset threshold value N or not; if yes, the front-end equipment executes the step 4; if not, returning to the step 1.
And 104, when the current repeated adjustment times reach a preset threshold value, determining a second interval of the illumination intensity by using the first interval, and carrying out day-night switching detection in the second interval.
And if so, determining a second interval of the illumination intensity by utilizing the first interval, and carrying out day-night switching detection in the second interval. If not, waiting for judging whether the current repeated adjustment times reach the preset threshold value or not next time.
In the process that the front-end device determines the second interval of the illumination intensity by using the first interval, the maximum illumination intensity value of the second interval needs to be larger than the maximum illumination intensity value of the first interval, and the minimum illumination intensity value of the second interval needs to be smaller than the minimum illumination intensity value of the first interval.
The second interval may be [ illumination intensity value 3, illumination intensity value 4], where the illumination intensity value 3 is the minimum illumination intensity value of the second interval, and the illumination intensity value 4 is the maximum illumination intensity value of the second interval. Moreover, the light intensity value 3 is smaller than the light intensity value 1, and the light intensity value 4 is larger than the light intensity value 2.
In the embodiment of the present invention, the process of determining the second interval of the illumination intensity by using the first interval may specifically include, but is not limited to, the following ways: and determining a third interval of the illumination intensity, so that the detected illumination intensity is always positioned in the third interval when the day-night switching detection is carried out in the third interval. When the time for the circadian switching detection using the third interval has continued for the set time, the current illumination intensity is determined. Determining the illumination intensity tolerance value as (current illumination intensity-average brightness value) + a set value, wherein the average brightness value is (maximum illumination intensity value of the first interval + minimum illumination intensity value of the first interval)/2. And determining the maximum illumination intensity value of the second interval as the sum of the average brightness value and the illumination intensity tolerance value, and determining the minimum illumination intensity value of the second interval as the difference between the average brightness value and the illumination intensity tolerance value.
In practical application, the repeated adjustment times reach the preset threshold, which generally occurs in a situation where the illumination intensity of the environment itself is very low (e.g., at night), and a scene with the illumination intensity additionally provided based on the fill-in luminance of the infrared lamp is needed. Therefore, when the first interval is used for determining the second interval of the illumination intensity, it needs to be ensured that the infrared lamp is turned on, and when light supplement processing is provided for the environment, the current illumination intensity is not greater than the maximum illumination intensity value of the second interval. Based on this, in order to determine the second interval, a stable current illumination intensity is first determined, that is, the current illumination intensity does not change due to repeated changes in fill-in luminance of the infrared lamp.
At present, the reason why the fill light brightness of the infrared lamp changes repeatedly is as follows: the infrared lamp is adjusted repeatedly between the opening state and the closing state, and the infrared lamp is adjusted repeatedly between different light supplement brightness of the opening state. Further, the reason why the infrared lamp is repeatedly adjusted between different fill-in luminances in the on state is that: the infrared lamp can be started only when the voltage reaches a certain value under the influence of the electrical characteristics of the infrared lamp, and the voltage value is generally about 20% of the voltage value required by the highest light supplement brightness of the infrared lamp, so that jump can be generated between the starting and the closing of the lowest light supplement brightness of the infrared lamp. And in addition, under the starting state of the infrared lamp, similar jumping to a certain degree also exists in each light supplement brightness interval, and if the current illumination intensity is adjusted up and down in the first interval all the time due to the jumping, namely the current illumination intensity is smaller than the minimum illumination intensity value of the first interval or larger than the maximum illumination intensity value of the first interval, the infrared lamp can be adjusted repeatedly between different light supplement brightness in the starting state.
Based on this, in order to confirm stable current illumination intensity, then the fill light luminance of infrared lamp can not change repeatedly, can not adjust repeatedly between on-state and off-state promptly, also can not adjust repeatedly between the different fill light luminance of on-state. In order to implement the process, in the embodiment of the present invention, a third interval of the illumination intensity is determined, where a maximum illumination intensity value of the third interval is a maximum illumination intensity value that can be reached by the illumination intensity of the current environment, and the illumination intensity of the current environment does not exceed the maximum illumination intensity value of the third interval no matter in a scene with a very high illumination intensity in the daytime or in a scene based on infrared lamps at night. In this way, when day and night switching detection is performed in the third interval, the detected illumination intensity is always in the third interval, so that the fill-in luminance of the infrared lamp cannot be adjusted repeatedly, that is, the fill-in luminance of the infrared lamp cannot be changed repeatedly.
Further, after the time for performing the day-night switching detection in the third interval lasts for the set time t seconds, the illumination intensity of the current environment is considered to be stabilized, the obtained current illumination intensity is the stable current illumination intensity, and the value of t seconds can be arbitrarily set according to experience, for example, 10 seconds.
Further, after obtaining the stable current illumination intensity, the illumination intensity tolerance value may be determined to be (current illumination intensity-average brightness value) + a set value, the maximum illumination intensity value of the second interval is determined to be the sum of the average brightness value and the illumination intensity tolerance value, and the minimum illumination intensity value of the second interval is determined to be the difference between the average brightness value and the illumination intensity tolerance value. Wherein the average brightness value is (maximum illumination intensity value in the first interval + minimum illumination intensity value in the first interval)/2.
in fig. 2, the brightness value 1 is the minimum illumination intensity value of the original brightness interval (i.e., the first interval), the brightness value 2 is the maximum illumination intensity value of the original brightness interval, i.e., the original brightness interval is [ brightness value 1, brightness value 2 ]. the original tolerance value of the original brightness interval is (brightness value 2-brightness value 1)/2, and the average brightness value (i.e., the average brightness value) of the brightness interval is (brightness value 2+ brightness value 1)/2. on the basis, the new tolerance value (i.e., the illumination intensity tolerance value) of the new brightness interval (i.e., the second interval) can be calculated as (the current illumination intensity-brightness interval average brightness) + the set value △ b, and the maximum illumination intensity value of the new brightness interval can be determined as brightness value 4, and the brightness value 4 is the sum of the average brightness value of the brightness interval and the new tolerance value, and the minimum illumination intensity value of the new brightness interval is determined as brightness value 3, and the brightness interval Δ 3 is the difference between the average brightness interval and the new tolerance value.
in a possible embodiment, the range of the set value △ b is preferably small and is not preferably large, because the set value △ b is present to ensure that the current illumination intensity is included in a new brightness interval (i.e., the second interval) to stop the repeated change of the fill-in brightness of the infrared lamp, and therefore, the set value △ b is a positive value, and the current illumination intensity does not break through the new brightness interval when the environment is adjusted slightly (e.g., the environment is slightly brighter).
In the embodiment of the invention, after the second interval is determined, for the process of carrying out day and night switching detection in the second interval, when the current illumination intensity is not detected to be in the second interval, whether the infrared lamp is in the off state is judged. If the infrared lamp is in the off state, the day-night switching detection in the first interval is resumed. If the infrared lamp is not in the off state, returning to step 102, and re-executing the above process, different from the above process, because the second interval is currently used for day-night switching detection, when it is detected that the current illumination intensity is not in the second interval, adjusting the fill-in luminance of the infrared lamp, the subsequent processing being the same as the above process, that is, when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance of this time is consistent with the change direction of the fill-in luminance of the last time, if not, updating the repeated adjustment times; and judging whether the current repeated adjustment times reach a preset threshold value, if so, re-determining a second interval of the illumination intensity, and carrying out day-night switching detection in the second interval.
The above process has been analyzed to: when the illumination intensity of the environment is very low (such as at night), the illumination intensity needs to be additionally provided based on the fill-in luminance of the infrared lamp, when the infrared lamp is turned on and fill-in light is provided to the environment, the current illumination intensity is not greater than the maximum illumination intensity value of the second interval, therefore, aiming at the process of switching and detecting day and night in the second interval, when the detected current illumination intensity is greater than the maximum illumination intensity value of the second interval, the illumination intensity of the environment may already be high (such as recovering from night to day), if the infrared lamp is in the off state at the moment, the illumination intensity of the environment already exceeds the maximum illumination intensity value of the second interval (such as the current environment is day), the infrared lamp does not need to be turned on any more subsequently, and the problem that the fill-in luminance of the infrared lamp repeatedly changes does not occur, so that the second interval is recovered to the first interval, and resuming the diurnal switching detection process in the first interval. In addition, when the detected current illumination intensity is greater than the maximum illumination intensity value in the second interval, if the infrared lamp is in the on state at this time, which indicates that the infrared lamp is repeatedly changed, the determined second interval is not suitable, and then the process returns to step 102 to re-execute the above process.
In the embodiment of the invention, after the second interval is determined, for the process of switching and detecting day and night in the second interval, when the current illumination intensity is detected to be smaller than the minimum illumination intensity value in the second interval, it indicates that the current illumination intensity cannot meet the image acquisition requirement when the infrared lamp is turned on for exposure processing. Therefore, the exposure process may be performed by other means to acquire a better image.
As shown in fig. 3, the day-night switching is closely related to the exposure adjustment for the exposure control. In fig. 3, the process of gradually increasing the ambient illumination (i.e., the illumination intensity) is performed sequentially from left to right. And in the first stage of lowest ambient illumination, simultaneously starting gain adjustment, infrared lamp adjustment and shutter adjustment. And at the second stage of the environment illumination centering, the infrared lamp adjustment and the shutter adjustment are started simultaneously. In the third stage of highest ambient light, only the shutter adjustment is opened. For the process of only opening the shutter adjustment, details are not repeated in this application. The above-described embodiments of the present application have been described with respect to the process of simultaneously turning on the infrared lamp adjustment and the shutter adjustment, and only the process of turning on the infrared lamp adjustment is described in the above-described embodiments. When the infrared lamp is started for exposure processing, if the current illumination intensity cannot meet the acquisition requirement of the image, the gain adjustment can be started for exposure processing, wherein the gain adjustment refers to that the signal intensity can be increased when the illumination intensity of the environment is low, and the signal intensity can be reduced when the illumination intensity of the environment is high.
After the gain adjustment is turned on for exposure processing, the information of the gain adjustment can be used for day-night switching detection, such as setting a color-to-black threshold and a black-to-color threshold, respectively. The day-night switching threshold judgment model shown in fig. 4 generally requires that the black-to-color threshold a be smaller than the color-to-black threshold b, so that both are present at a certain interval to cope with repeated day-night switching. Specifically, when the gain of the front-end device is smaller than the black-to-color threshold a, it indicates that the ambient light intensity becomes high, and the IR filter is activated to filter the infrared light in the environment. When the gain of the front-end equipment is greater than the color-to-black threshold b, the illumination intensity of the environment is low, the IR filter is removed, the infrared light in the environment is received, the infrared lamp of the front-end equipment is turned on, and the gain of the front-end equipment is improved.
Based on the technical scheme, in the embodiment of the invention, in the automatic day and night switching process, when the situation that the fill-in brightness of the infrared lamp changes repeatedly occurs, the front-end equipment can find the situation in time, adjust the first interval corresponding to the illumination intensity into the second interval, and perform day and night switching detection in the second interval. Because the maximum illumination intensity value between the second interval is greater than the maximum illumination intensity value between the first interval, the minimum illumination intensity value between the second interval is less than the minimum illumination intensity value between the first interval, consequently even current illumination intensity when not being located between the first interval, also can be located between the second interval to solve the problem of the repeated switching round the clock that leads to because of front-end equipment self infrared lamp, can satisfy the switching requirement round the clock of each scene, ensure the normal use of front-end equipment.
Based on the same inventive concept as the method, the embodiment of the invention also provides a device for detecting the day-night switching, and the device for detecting the day-night switching can be applied to front-end equipment. The day and night switching detection device can be realized by software, or can be realized by hardware or a combination of the software and the hardware. Taking a software implementation as an example, the apparatus in a logical sense is formed by reading corresponding computer program instructions in the non-volatile memory through a processor of the front-end device where the apparatus is located. From a hardware aspect, as shown in fig. 5, a hardware structure diagram of a front-end device where the device for detecting day-night switching provided by the present invention is located is shown, where the front-end device may further include other hardware, such as a forwarding chip, a network interface, and a memory, which are responsible for processing packets, in addition to the processor and the nonvolatile memory shown in fig. 5; in terms of hardware structure, the front-end device may also be a distributed device, and may include a plurality of interface cards, so as to perform message processing extension at a hardware level.
As shown in fig. 6, a structural diagram of a device for detecting a circadian switch, which is proposed by the present invention and is applied to a front-end device, specifically includes:
the infrared repeated detection module 11 is used for determining a first interval of illumination intensity and carrying out day-night switching detection in the first interval; when detecting that the current illumination intensity is not in the first interval, adjusting the fill-in brightness of the infrared lamp; when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times; judging whether the current repeated adjustment times reach a preset threshold value, if so, informing a brightness tolerance module to determine a second interval;
a brightness tolerance module 12 for determining a second interval of the illumination intensity using the first interval after receiving the notification from the infrared repeated detection module, and performing a day-night switching detection in the second interval;
the maximum illumination intensity value of the second interval is greater than that of the first interval, and the minimum illumination intensity value of the second interval is less than that of the first interval.
The infrared repeated detection module 11 is specifically configured to, in a process of adjusting the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is not in the first interval, perform day-night switching detection in the first interval, and increase the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is smaller than the minimum illumination intensity value in the first interval; and when the current illumination intensity is detected to be greater than the maximum illumination intensity value of the first interval, reducing the fill-in illumination brightness of the infrared lamp.
The infrared repeated detection module 11 is specifically configured to, in a process of determining whether a change direction of luminance of this supplementary lighting is consistent with a change direction of luminance of a previous supplementary lighting, determine that the change direction of luminance of this supplementary lighting is consistent with the change direction of luminance of the previous supplementary lighting if it is known that the change direction of luminance of this supplementary lighting is to increase luminance of the infrared lamp, and the change direction of luminance of the previous supplementary lighting is to increase luminance of the infrared lamp; or if it is known that the change direction of the luminance of the current supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or if it is known that the change direction of the luminance of the current supplementary lighting is to reduce the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or, if it is known that the change direction of the luminance of the current supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, it is determined that the change direction of the luminance of the current supplementary lighting is the same as the change direction of the luminance of the last supplementary lighting.
The brightness tolerance module 12 is specifically configured to determine a third interval of the illumination intensity in the process of determining the second interval of the illumination intensity by using the first interval, so that the detected illumination intensity is always located in the third interval when performing the diurnal switching detection in the third interval; determining the current illumination intensity after the time for performing the diurnal switching detection using the third interval has continued for a set time; determining the illumination intensity tolerance value as (the current illumination intensity-average brightness value) + a set value, wherein the average brightness value is (the maximum illumination intensity value in the first interval + the minimum illumination intensity value in the first interval)/2; and determining the maximum illumination intensity value of the second interval as the sum of the average brightness value and the illumination intensity tolerance value, and determining the minimum illumination intensity value of the second interval as the difference between the average brightness value and the illumination intensity tolerance value.
The brightness tolerance module 12 is further configured to, for the process of performing day-night switching detection in the second interval, determine whether the infrared lamp is in an off state when it is detected that the current illumination intensity is not in the second interval; if the infrared lamp is in the off state, the day-night switching detection in the first interval is resumed; and if the infrared lamp is not in the off state, informing the infrared repeated detection module to redetermine a second interval of the illumination intensity.
The modules of the device can be integrated into a whole or can be separately deployed. The modules can be combined into one module, and can also be further split into a plurality of sub-modules.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus a necessary general hardware platform, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention. Those skilled in the art will appreciate that the drawings are merely schematic representations of one preferred embodiment and that the blocks or flow diagrams in the drawings are not necessarily required to practice the present invention.
Those skilled in the art will appreciate that the modules in the devices in the embodiments may be distributed in the devices in the embodiments according to the description of the embodiments, and may be correspondingly changed in one or more devices different from the embodiments. The modules of the above embodiments may be combined into one module, or further split into multiple sub-modules. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (8)
1. A method of circadian switch detection, the method comprising:
determining a first interval of illumination intensity, and carrying out day-night switching detection in the first interval;
when detecting that the current illumination intensity is not in the first interval, adjusting the fill-in brightness of the infrared lamp;
when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times;
judging whether the current repeated adjustment times reach a preset threshold value, if so, determining a second interval of the illumination intensity by using the first interval, and carrying out day-night switching detection in the second interval;
the maximum illumination intensity value of the second interval is greater than that of the first interval, and the minimum illumination intensity value of the second interval is less than that of the first interval;
the process of determining the second interval of the illumination intensity by using the first interval specifically includes:
determining a third interval of the illumination intensity, so that the detected illumination intensity is always positioned in the third interval when the day-night switching detection is carried out in the third interval; determining the current illumination intensity after the time for performing the diurnal switching detection using the third interval has continued for a set time; determining the illumination intensity tolerance value as (the current illumination intensity-average brightness value) + a set value, wherein the average brightness value is (the maximum illumination intensity value in the first interval + the minimum illumination intensity value in the first interval)/2; determining the maximum illumination intensity value of the second interval as the sum of the average brightness value and the illumination intensity tolerance value, and determining the minimum illumination intensity value of the second interval as the difference between the average brightness value and the illumination intensity tolerance value;
and the maximum illumination intensity value of the third interval is the maximum illumination intensity value which can be reached by the illumination intensity of the current environment.
2. The method according to claim 1, wherein the step of adjusting the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is not in the first interval specifically includes:
aiming at the process of carrying out day and night switching detection in the first interval, when the current illumination intensity is detected to be smaller than the minimum illumination intensity value in the first interval, the supplementary illumination brightness of the infrared lamp is increased; and when the current illumination intensity is detected to be greater than the maximum illumination intensity value of the first interval, the supplementary illumination brightness of the infrared lamp is reduced.
3. The method according to claim 2, wherein the step of determining whether the change direction of the current fill-in luminance is consistent with the change direction of the previous fill-in luminance includes:
if the change direction of the luminance of the current supplementary lighting is obtained to be the supplementary lighting luminance of the infrared lamp, and the change direction of the luminance of the last supplementary lighting is obtained to be the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is consistent with the change direction of the luminance of the last supplementary lighting; or,
if the change direction of the luminance of the current supplementary lighting is obtained to be the supplementary lighting luminance of the infrared lamp, and the change direction of the luminance of the last supplementary lighting is obtained to be the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or,
if the change direction of the luminance of the current supplementary lighting is known to be the reduction of the supplementary lighting luminance of the infrared lamp, and the change direction of the luminance of the last supplementary lighting is known to be the increase of the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or,
and if the change direction of the luminance of the current supplementary lighting is known to be the reduction of the supplementary lighting luminance of the infrared lamp, and the change direction of the luminance of the last supplementary lighting is known to be the reduction of the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is consistent with the change direction of the luminance of the last supplementary lighting.
4. The method of claim 1, further comprising:
aiming at the process of carrying out day and night switching detection in the second interval, when detecting that the current illumination intensity is not in the second interval, judging whether the infrared lamp is in a closed state;
if the infrared lamp is in the off state, the day-night switching detection in the first interval is resumed;
if the infrared lamp is not in the closed state, when the current illumination intensity is detected not to be in the second interval, adjusting the light supplement brightness of the infrared lamp; when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times; and judging whether the current repeated adjustment times reach a preset threshold value, if so, re-determining a second interval of the illumination intensity, and carrying out day-night switching detection in the second interval.
5. A device for diurnal switching detection, the device comprising in particular:
the infrared repeated detection module is used for determining a first interval of the illumination intensity and carrying out day-night switching detection in the first interval; when detecting that the current illumination intensity is not in the first interval, adjusting the fill-in brightness of the infrared lamp; when the fill-in luminance of the infrared lamp changes, judging whether the change direction of the fill-in luminance at this time is consistent with the change direction of the fill-in luminance at the last time, and if not, updating the repeated adjustment times; judging whether the current repeated adjustment times reach a preset threshold value, if so, informing a brightness tolerance module to determine a second interval;
the brightness tolerance module is used for determining a second interval of the illumination intensity by using the first interval after receiving the notification from the infrared repeated detection module, and carrying out day-night switching detection in the second interval;
the maximum illumination intensity value of the second interval is greater than that of the first interval, and the minimum illumination intensity value of the second interval is less than that of the first interval;
the brightness tolerance module is specifically used for determining a third interval of the illumination intensity in the process of determining a second interval of the illumination intensity by using the first interval, so that the detected illumination intensity is always located in the third interval when the day-night switching detection is carried out in the third interval; determining the current illumination intensity after the time for performing the diurnal switching detection using the third interval has continued for a set time; determining the illumination intensity tolerance value as (the current illumination intensity-average brightness value) + a set value, wherein the average brightness value is (the maximum illumination intensity value in the first interval + the minimum illumination intensity value in the first interval)/2; determining the maximum illumination intensity value of the second interval as the sum of the average brightness value and the illumination intensity tolerance value, and determining the minimum illumination intensity value of the second interval as the difference between the average brightness value and the illumination intensity tolerance value;
and the maximum illumination intensity value of the third interval is the maximum illumination intensity value which can be reached by the illumination intensity of the current environment.
6. The apparatus of claim 5,
the infrared repeated detection module is specifically configured to, in a process of adjusting the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is not in the first interval, perform day-night switching detection in the first interval, and increase the fill-in luminance of the infrared lamp when detecting that the current illumination intensity is smaller than the minimum illumination intensity value in the first interval; and when the current illumination intensity is detected to be greater than the maximum illumination intensity value of the first interval, reducing the fill-in illumination brightness of the infrared lamp.
7. The apparatus of claim 6,
the infrared repeated detection module is specifically configured to, in a process of determining whether a change direction of luminance of this supplementary lighting is consistent with a change direction of luminance of previous supplementary lighting, determine that the change direction of luminance of this supplementary lighting is consistent with the change direction of luminance of previous supplementary lighting if it is known that the change direction of luminance of this supplementary lighting is to increase luminance of the infrared lamp and the change direction of luminance of previous supplementary lighting is to increase luminance of the infrared lamp; or if it is known that the change direction of the luminance of the current supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or if it is known that the change direction of the luminance of the current supplementary lighting is to reduce the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to increase the supplementary lighting luminance of the infrared lamp, determining that the change direction of the luminance of the current supplementary lighting is not consistent with the change direction of the luminance of the last supplementary lighting; or, if it is known that the change direction of the luminance of the current supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp and the change direction of the luminance of the last supplementary lighting is to decrease the supplementary lighting luminance of the infrared lamp, it is determined that the change direction of the luminance of the current supplementary lighting is the same as the change direction of the luminance of the last supplementary lighting.
8. The apparatus of claim 5,
the brightness tolerance module is also used for carrying out day and night switching detection in the second interval, and judging whether the infrared lamp is in a closed state or not when detecting that the current illumination intensity is not in the second interval; if the infrared lamp is in the off state, the day-night switching detection in the first interval is resumed; and if the infrared lamp is not in the off state, informing the infrared repeated detection module to redetermine a second interval of the illumination intensity.
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| CN113132718B (en) * | 2021-04-20 | 2022-05-24 | 深圳市多酷科技有限公司 | Day and night type image pickup device switching abnormality detection method, device, equipment and storage medium |
| CN118102527A (en) * | 2024-04-22 | 2024-05-28 | 广东省旭晟半导体股份有限公司 | Method and device for adjusting brightness of infrared light source |
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