CN103533252B - Method and device for automatically switching day and night modes - Google Patents
Method and device for automatically switching day and night modes Download PDFInfo
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Abstract
The invention provides a method for automatically switching day and night modes. The method is applied to a camera and comprises the following steps of A, calculating the brightness of a picture according to a current photographed image; B, performing day and night mode switching according to the calculated brightness of the picture. According to the method provided by the technical scheme, the problems of cost, illumination and instruments which are caused by the adoption of a photoresistor in the prior art are solved.
Description
Technical Field
The invention relates to the technical field of video monitoring, in particular to a method and a device for automatically switching day and night modes.
Background
In a video monitoring system, an automatic day-night switching function (also called an automatic ICR function) of a front-end monitoring device is realized by automatically switching an IR cut filter according to light intensity, and the aim is to increase the sensitivity characteristic of the monitoring front-end device. When the front-end monitoring equipment is placed under dim light intensity, the IR cut filter sheet is automatically moved away, the infrared sensitivity is increased, and a clear black-and-white image can be obtained by matching with infrared light; when the front-end monitoring equipment is placed under the light intensity with abundant sunlight, the IR cut filter is automatically added, so that a clear image with real color is obtained (visible light and infrared light enter a CCD (charge coupled device) or a CMOS (complementary metal oxide semiconductor) and the color restoration is interfered). The automatic switching of the ICR enables the front-end monitoring equipment to work effectively in both daytime and nighttime environments.
In the prior art, a photoresistor is adopted to realize day and night automatic switching function of front-end monitoring equipment. However, this technique has several disadvantages:
(1) illuminance inconsistency: the photoresistor detects illumination different from that detected by the lens, and the photoresistor detects illumination of the device mounting position, which is different from that sensed by the lens. (2) Device non-uniformity: the individual difference of the photoresistors exists, the inconsistency of detection results exists in the photoresistors under the same environment illumination, and the inconsistency of the installation positions of the photoresistors also causes the inconsistency of the detection results; (3) cost: the photoresistor requires cost itself, plus the design and installation in the process makes it more costly.
Disclosure of Invention
In view of the above, the present invention provides a method for automatically switching between day and night modes.
The method of the invention is applied to a camera, and comprises the following steps:
step A, calculating the brightness of a picture according to a current shot image;
and B, switching day and night modes according to the calculated picture brightness.
Preferably, the day and night mode switching according to the calculated picture brightness is specifically:
judging the size relationship between the brightness of the current picture and Th _ N and Th _ D;
when the current day and night mode is a black and white mode and the picture brightness is greater than Th _ N, switching the day and night mode to a color mode; when the current day and night mode is the color mode and the picture brightness is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Th _ N and Th _ D are preset values, and Th _ N > Th _ D.
Preferably, the circadian mode switching is performed using smart IR technique according to the calculated picture brightness.
Preferably, the switching of the day and night mode by adopting smart IR technology according to the calculated picture brightness is specifically as follows:
judging the size relationship between the brightness of the current picture and Th _ N1 and Th _ D;
judging the size relation between the brightness adjustment gain of the current picture and Gi;
judging the relation between the current infrared lamp intensity and the lowest-grade infrared lamp intensity;
when the current day and night mode is a black and white mode, the picture brightness is greater than Th _ N1, the picture brightness adjusting gain is not greater than Gi, and the infrared lamp intensity is not greater than the lowest infrared lamp intensity, the day and night mode is switched to a color mode; when the current day and night mode is the color mode and the picture brightness is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Gi is a gain lossless point, Th _ N1 and Th _ D are preset values, and Th _ N1> Th _ D.
Preferably, the average brightness of the picture is counted using a brightness histogram when calculating the brightness of the picture from the currently photographed image.
Based on the same conception, the invention also provides a day and night mode automatic switching device, which is applied to a camera and comprises:
the brightness calculation module is used for calculating the image brightness of the currently shot image;
and the day and night mode switching module is used for switching the day and night mode according to the calculated picture brightness.
Preferably, the circadian mode switching module comprises: the device comprises a brightness judgment module and a switching control module; wherein,
the brightness judging module is used for judging whether the picture brightness is greater than TH _ N or less than Th _ D, and if so, the switching control module is informed;
the switching control module is used for switching the day and night mode to the color mode when the current day and night mode is the black and white mode and the picture brightness is more than TH _ N; when the current day and night mode is the color mode and the brightness of the picture is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Th _ N and Th _ D are preset values, and Th _ N > Th _ D.
Preferably, the circadian mode switching module performs circadian mode switching using smart IR technology according to the calculated picture brightness.
Preferably, the circadian mode switching module comprises: the device comprises a brightness judgment module, a brightness adjustment gain judgment module, an infrared lamp intensity judgment module and a switching control module; wherein,
the brightness judging module is used for judging whether the picture brightness is greater than TH _ N1 or less than Th _ D, and if so, the switching control module is informed;
the brightness adjustment gain judgment module is used for judging whether the picture brightness adjustment gain is not greater than Gi or not, and if so, the brightness adjustment gain judgment module informs the switching control module;
the infrared lamp intensity judging module is used for judging whether the infrared lamp intensity is not greater than the infrared lamp intensity of the lowest gear or not, and if so, informing the switching control module;
the switching control module is used for switching the day and night mode to the color mode when the current day and night mode is the black and white mode, the picture brightness is greater than Th _ N1, the picture brightness adjusting gain is not greater than Gi, and the infrared lamp intensity is not greater than the lowest infrared lamp intensity; when the current day and night mode is the color mode and the picture brightness is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Gi is a gain lossless point, Th _ N1 and Th _ D are preset values, and Th _ N1> Th _ D.
Preferably, the brightness calculation module calculates the average brightness of the picture by using a brightness histogram when calculating the brightness of the picture according to the currently photographed image.
Compared with the prior art, the method and the device have the advantages that the brightness value of the image acquired by the camera lens is used as the basis for switching the day and night modes of the camera, and the problems of cost, illumination and devices in the prior art due to the adoption of the photoresistor are solved. In addition, the invention also overcomes the problem of repeated switching of day and night modes.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention.
FIG. 2 is a flow chart of an embodiment of the present invention.
FIG. 3 is a logical block diagram of the apparatus of the present invention.
FIG. 4 is a logical structure diagram of the apparatus of the present invention.
Detailed Description
The following detailed description of the invention refers to the accompanying drawings.
The invention provides a day and night mode automatic switching method applied to a camera, which specifically comprises the following steps: A. calculating the brightness of a picture according to the currently shot image; B. and switching day and night modes according to the calculated picture brightness.
After the camera takes a frame of image, the average brightness of the picture can be counted by using the image brightness histogram. The average brightness is the brightness of the currently calculated picture. The brightness of the picture, namely the brightness reflected by the lens, is taken as a main judgment factor for automatically switching day and night modes, and the requirement of human eye observation is better met.
FIG. 1 is a flow chart of an embodiment of the present invention.
And S11, acquiring the current brightness value Xa of the picture.
S12, judging whether the current mode is black and white mode, if yes, turning to step S13, otherwise, turning to step S14.
S13, judging whether the current picture is too bright, if so, switching the day and night mode to the color mode.
S14, judging whether the current picture is too dark, if so, switching the day and night mode to the black and white mode.
When the image is judged to be too bright or too dark, the acquired brightness value can be compared with a preset threshold value. For example, a picture is considered too bright when Xa > Th _ N and too dark when Xa < Th _ D. Th _ N and Th _ D are empirical values obtained through a number of experiments. The day and night mode is switched to the color mode or the black and white mode to obtain better image effect, so that the observer can obtain more image details.
The method uses the brightness value of the image acquired by the camera lens as the basis for switching the day and night modes of the camera, and solves the problems of cost, illumination and devices in the prior art due to the adoption of the photoresistor. The brightness value of the image belongs to the parameter which is often used by the camera in the process of image quality control, and the invention uses the parameter value as the basis of day-night mode switching and does not enlarge the complex part of the internal processing of the camera.
In order to improve the night image effect, the front-end monitoring equipment is generally loaded with infrared lamps. In the black and white mode, the infrared lamp is automatically turned on, so that the image quality at night can be greatly improved. However, in some specific scenes, the infrared light is directly reflected to the lens to make the picture bright, the day and night mode is automatically switched back to the color mode and the infrared lamp is turned off, and after the infrared lamp is turned off, the ambient brightness is too dark, and the day and night mode is automatically switched back to the black and white mode, so that the day and night mode is repeatedly switched.
In order to overcome the above-mentioned problem of the repetitive switching of the circadian mode, the present invention applies Smart IR technology to overcome the problem of the repetitive switching of the circadian mode. Smart IR technology is that the camera product adopts intelligent image processing technology, and intelligently adjusts the brightness curve by detecting the brightness of multiple blocks of an image, thereby preventing the phenomena of overexposure of an image of a certain block, underexposure of an image of a certain block, and the like. The key point of the method is that the control on the intensity of the infrared lamp is added in the night exposure control, the current picture brightness adjusting gain and the intensity of the infrared lamp are acquired in real time, and the current picture brightness adjusting gain and the intensity of the infrared lamp are adjusted in a self-adaptive mode, so that the picture brightness is stabilized within a certain range. The following describes in detail how the Smart IR technology is applied to overcome the problem of repeated switching of the day and night mode in the present invention by the second embodiment.
Referring to the flow chart shown in fig. 2, a description of the second embodiment will be made in conjunction with the flow chart.
And S21, acquiring the brightness value of the current picture.
S22, judging whether the current mode is a black-and-white mode, if so, turning to S23; otherwise go to S24.
S23, determine whether the picture is overexposed (i.e. Xa > Th _ N1.
S24, determine whether the picture is too dark (Xa < Th _ D.
S25, the mode is switched to the black-and-white mode, and the process returns to S21.
S26, judging whether the picture brightness adjusting gain is larger than Gi (gain lossless point), if so, turning to S28; otherwise go to S29.
S27, judging whether the picture is too dark (namely Xa < TH _ N2), if yes, turning to S30; otherwise go to S31.
And S28, adjusting the gain downwards and returning to S21.
And S29, judging whether the infrared lamp is larger than the brightness of the lowest gear, if so, turning to S35, and otherwise, turning to S36.
S30, judging whether the infrared lamp is less than the highest-grade brightness, if so, turning to S32; otherwise go to S33.
S31, the screen brightness remains unchanged, and the process returns to S21.
And S32, adjusting the brightness of the infrared lamp up, and returning to S21.
S33, judging whether the picture brightness adjusting gain is smaller than the maximum value, if yes, turning to S34, otherwise, not processing and returning to S21.
S34, the gain is adjusted up, and the process returns to S21.
And S35, adjusting the brightness of the infrared lamp downwards, and returning to S21.
S36, switching to color mode, and returning to S21.
Parameters in the above example: th _ N1, Th _ N2 and Th _ D are preset values, and are obtained through a large number of experimental tests, and the three relations are Th _ N1> Th _ N2> Th _ D. (Th _ N2, Th _ N1) is a stable interval of the screen brightness in the monochrome mode, and the screen quality is better in this interval, so this interval belongs to the result required by Smart IR technique in the monochrome mode. If the brightness is not in the interval, the brightness is adjusted to reach the interval by adjusting the gain or the infrared lamp.
In the black-and-white mode, in the process of adjusting the brightness in the stable interval, if the judged brightness is greater than a preset value Th _ N1, the brightness adjusting gain is not greater than a gain lossless point Gi, and the infrared lamp is not greater than the brightness of the lowest level, the black-and-white mode is switched to the color mode. This solves the above-mentioned problem of repeated switching of the day and night mode. Since this method recognizes that the picture brightening is caused by ambient light rather than infrared light, it is possible to avoid repeated switching of the day and night mode.
There is no difference between the switching in the color mode and the embodiment, that is, the color mode is switched to the black-and-white mode when the luminance is less than the preset value Th _ D.
The invention also provides a day and night mode automatic switching device based on the same conception, and the device is applied to the camera. Referring to fig. 3, the apparatus includes: the device comprises a brightness calculation module and a day and night mode switching module. The brightness calculation module is used for calculating the image brightness of the current shot image; the day and night mode switching module is used for switching the day and night mode according to the calculated picture brightness.
The circadian mode switching module further comprises: the device comprises a brightness judgment module and a switching control module. The brightness judging module is used for judging whether the picture brightness is greater than TH _ N or less than Th _ D, and if so, the switching control module is informed; the switching control module is used for switching the day and night mode to the color mode when the current day and night mode is the black and white mode and the picture brightness is more than TH _ N; when the current day and night mode is the color mode and the brightness of the picture is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Th _ N and Th _ D are preset values, and Th _ N > Th _ D.
The device uses the brightness value of the image collected by the camera lens as the basis for switching the day and night modes of the camera, and solves the problems of cost, illumination and devices in the prior art due to the adoption of the photoresistor.
However, the above-described device has a problem that the day-night mode is repeatedly switched in some cases. To solve this problem, further improvements in the apparatus are required. And the improved day and night mode switching module adopts smartIR technology to switch the day and night mode according to the calculated picture brightness. Specifically, the circadian mode switching module includes: the device comprises a brightness judgment module, a brightness adjustment gain judgment module, an infrared lamp intensity judgment module and a switching control module. The brightness judging module is used for judging whether the picture brightness is greater than TH _ N1 or less than Th _ D, and if so, the switching control module is informed; the brightness adjustment gain judgment module is used for judging whether the picture brightness adjustment gain is not greater than Gi or not, and if so, the brightness adjustment gain judgment module informs the switching control module; the infrared lamp intensity judging module is used for judging whether the infrared lamp intensity is not greater than the infrared lamp intensity of the lowest level or not, and if so, informing the switching control module; the switching control module is used for switching the day and night mode to the color mode when the current day and night mode is the black and white mode, the picture brightness is greater than Th _ N1, the picture brightness adjusting gain is not greater than Gi, and the infrared lamp intensity is not greater than the lowest infrared lamp intensity; when the current day and night mode is the color mode and the picture brightness is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Gi is a gain lossless point, Th _ N1 and Th _ D are preset values, and Th _ N1> Th _ D.
Applying the smart IR technique to the judgment of the day-night mode switching recognizes whether the brightness is high due to the ambient light or the infrared light in the black-and-white mode, so that the problem of the repeated switching is overcome.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A day and night mode automatic switching method is applied to a camera and is characterized by comprising the following steps:
step A, calculating the brightness of a picture according to a current shot image;
b, switching day and night modes according to the calculated picture brightness;
wherein, the day and night mode switching is performed according to the calculated picture brightness, comprising:
adopting smart IR technology to switch day and night modes according to the calculated picture brightness, which specifically comprises the following steps:
judging the size relationship between the brightness of the current picture and Th _ N1 and Th _ D;
judging the size relation between the brightness adjustment gain of the current picture and Gi;
judging the relation between the current infrared lamp intensity and the lowest-grade infrared lamp intensity;
when the current day and night mode is a black and white mode, the picture brightness is greater than Th _ N1, the picture brightness adjusting gain is not greater than Gi, and the infrared lamp intensity is not greater than the lowest infrared lamp intensity, the day and night mode is switched to a color mode; when the current day and night mode is the color mode and the picture brightness is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Gi is a gain lossless point, Th _ N1 and Th _ D are preset values, and Th _ N1> Th _ D.
2. The circadian mode automatic switching method according to claim 1, wherein said calculating the luminance of the frame from the currently taken image uses a luminance histogram to count the average luminance of the frame.
3. An automatic switching device for day and night modes, which is applied to a camera, is characterized by comprising:
the brightness calculation module is used for calculating the image brightness of the currently shot image;
a day and night mode switching module for switching day and night modes according to the calculated picture brightness;
the day and night mode switching module adopts smart IR technology to switch day and night modes according to the calculated picture brightness;
the circadian mode switching module includes: the device comprises a brightness judgment module, a brightness adjustment gain judgment module, an infrared lamp intensity judgment module and a switching control module; wherein,
the brightness judging module is used for judging whether the picture brightness is greater than TH _ N1 or less than Th _ D, and if so, the switching control module is informed;
the brightness adjustment gain judgment module is used for judging whether the picture brightness adjustment gain is not greater than Gi or not, and if so, the brightness adjustment gain judgment module informs the switching control module;
the infrared lamp intensity judging module is used for judging whether the infrared lamp intensity is not greater than the infrared lamp intensity of the lowest gear or not, and if so, informing the switching control module;
the switching control module is used for switching the day and night mode to the color mode when the current day and night mode is the black and white mode, the picture brightness is greater than Th _ N1, the picture brightness adjusting gain is not greater than Gi, and the infrared lamp intensity is not greater than the lowest infrared lamp intensity; when the current day and night mode is the color mode and the picture brightness is less than Th _ D, the day and night mode is switched to the black and white mode, wherein Gi is a gain lossless point, Th _ N1 and Th _ D are preset values, and Th _ N1> Th _ D.
4. The automatic switching apparatus for circadian modes according to claim 3, wherein said luminance calculating module counts the average luminance of the picture using a luminance histogram when calculating the luminance of the picture from the currently photographed image.
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