Energy-saving control method for outdoor advertising machine

Abstract

The present invention relates to the field of data processing technology, and specifically to an energy-saving control method for an outdoor advertising machine. The method collects statistics on the control records of historical time periods, obtains a schedulable function of the upper limit of the control amount, further analyzes the relationship between illumination and screen display, and uses the screen illumination brightness diagram and the distribution and brightness relationship between different categories of pixel points on the pre-input screen to determine the overall light migration impact value at the current moment, and obtains a brightness migration function by combining the switching time interval and the light migration drop. An error term is introduced, and an energy-saving control function can be obtained by combining three information features. The output value of the energy-saving control function can be used to determine whether energy-saving adjustment is needed at the current moment. The present invention can effectively avoid the sensitivity of advertising machine regulation by controlling energy-saving regulation through the energy-saving control function, making the energy-saving regulation process more energy-saving while also ensuring the display quality of the advertising machine.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to an energy-saving control method for an outdoor advertising machine. Background Art

[0002] Outdoor advertising machines are electronic display devices specifically used to display advertising content in outdoor environments. Outdoor advertising machines can use energy-saving materials and sensor control to reduce energy consumption. The control strategy of general outdoor advertising machines needs to consider a variety of environmental factors such as changes in ambient light, changes in traffic flow, changes in human flow, special events or activities, changes in temperature and humidity, changes in power grid load, changes in advertising content, time periods, etc. However, in the actual control process, due to changes in environmental factors, the control strategy is too sensitive, and there will be a transition in control, which will increase the energy consumption consumed by the control and reduce the life of the device, which is not conducive to the normal use of the advertising machine. Summary of the invention

[0003] In order to solve the technical problem that the existing outdoor advertising machine is too sensitive when performing energy-saving regulation, the purpose of the present invention is to provide an energy-saving control method for an outdoor advertising machine. The technical solution adopted is as follows:

[0004] The present invention proposes an energy-saving control method for an outdoor advertising machine, the method comprising:

[0005] Obtain the control records of the outdoor advertising machine within a preset historical time period; respectively fit the positive control amount and the negative control amount in the control record, and obtain the control amount upper limit schedulable function according to the difference between the negative control amount fitting curve and the positive control amount fitting curve;

[0006] For the current moment, obtain the switching time interval of the screen at the current moment, the pre-input screen of the advertising machine, and the screen light brightness map of the same size as the pre-input screen; obtain the high-brightness pixel points and low-brightness pixel points on the pre-input screen, and obtain the high-illuminance pixel points and low-illuminance pixel points in the screen light brightness map; in the pre-input screen, use the high-brightness and high-illuminance pixel points as the target pixel points, the nearest low-brightness and low-illuminance pixel points of the target pixel points as the first comparison point, and the nearest low-brightness and high-illuminance pixel points as the second comparison point; obtain the light migration influence value of the target pixel points according to the distribution and brightness difference between the target pixel points and the two comparison points; obtain the overall light migration influence value of the current moment according to the distribution of the light migration influence values ​​of all target pixels;

[0007] Obtaining the light migration difference at the current moment according to the current change of the photodiode on the screen, and obtaining the brightness migration function at the current moment according to the switching time interval, the overall light migration impact value, and the light migration difference;

[0008] An energy-saving control function is obtained according to the brightness migration function, the upper limit schedulable function of the control amount and the error term; the error term is obtained by the difference between the actual displayed image and the pre-input image; and it is determined whether energy-saving adjustment is required at the current moment according to the energy-saving control function.

[0009] Furthermore, the fitting method of the negative control amount fitting curve and the positive control amount fitting curve includes:

[0010] For any dimension of the positive control amount and the negative control amount as the target dimension, the data of the target dimension is fitted, and in the fitting process, all target extreme value points of the fitting curve are obtained; if the target dimension is the positive control amount dimension, the target extreme value point is the minimum value point, and if the target dimension is the negative control amount dimension, the target extreme value point is the maximum value point;

[0011] For each data point on the fitting curve, the average data value of the two adjacent target extreme points is taken as the reference value, and the difference between the data point and the reference value is taken as the first fitting deviation; the difference between the data value of each target extreme point and the actual value is taken as the second fitting deviation; all the first fitting deviations and all the second fitting deviations are accumulated and summed to obtain the overall fitting deviation; the fitting process is stopped when the overall fitting deviation is the smallest.

[0012] Furthermore, the method for obtaining the control amount upper limit schedulable function includes:

[0013] The upper limit schedulable function of the control amount is obtained by subtracting the positive control amount fitting curve from the negative control amount fitting curve.

[0014] Furthermore, the pre-input image and the screen light luminance map are processed using the Otsu threshold algorithm to obtain high-brightness pixels and low-brightness pixels on the pre-input image, and high-illuminance pixels and low-illuminance pixels in the screen light luminance map.

[0015] Furthermore, the method for obtaining the light migration impact value includes:

[0016] The vector pointing from the target pixel point to the first comparison point is used as a first vector, the vector pointing from the target pixel point to the second comparison point is used as a second vector, and the Euclidean norm between the first vector and the second vector is obtained;

[0017] Obtaining a first brightness difference between a target pixel and the first comparison point, obtaining a second brightness difference between the first comparison point and the second comparison point, and using a ratio of the first brightness difference to the second brightness difference as a brightness compensation feature;

[0018] The Euclidean norm negative correlation is mapped and normalized, and then multiplied with the brightness compensation feature to obtain the light migration impact value.

[0019] Furthermore, the method for obtaining the overall light migration impact value includes:

[0020] The average light migration impact value of all target pixels is obtained, and the average light migration impact value is multiplied by the proportion of the number of target pixels in the pre-input picture to obtain the overall light migration impact value.

[0021] Furthermore, the method for obtaining the light migration drop includes:

[0022] At the current moment, among the unit panels on the screen, the unit panel with the largest sum of photodiode currents is used as the light spot unit panel, and the other unit panels are used as background unit panels; the difference between the average increased current of the photodiodes in the light spot unit panel and the average increased current of the photodiodes in the background unit panel at the current moment is used as the light migration drop.

[0023] Furthermore, the method for obtaining the brightness transfer function includes:

[0024] The sum of the light migration drop and the overall light migration impact value is taken as a light impact feature; the switching time interval is negatively correlated mapped and normalized, and then multiplied with the light impact feature to obtain the brightness migration function.

[0025] Furthermore, the method for obtaining the error term includes:

[0026] The pre-input picture is merged with the screen light luminance map to obtain the actual display image, and the mean square error between the actual display image and the pre-input picture is multiplied by a preset error weight to obtain the error term.

[0027] Furthermore, the method for obtaining the energy-saving control function includes:

[0028] The energy-saving control function is obtained by subtracting the brightness migration function from the upper limit schedulable function of the control amount and then adding the error term.

[0029] The present invention has the following beneficial effects:

[0030] The present invention first counts the control records of the historical time period to obtain a control amount upper limit schedulable function. The significance of this function is to constrain the control upper limit of the outdoor advertising machine. Through this function, the control amount upper limit of the advertising machine at the current moment can be determined, and on this basis, it is further determined whether to perform control. Further analyze the relationship between illumination and screen display, and use the screen illumination brightness diagram and the distribution and brightness relationship between different categories of pixels on the pre-input screen to determine the overall light migration impact value at the current moment. This index represents the influence of the current illumination environment factor on the advertising display. Therefore, the brightness migration function is obtained by combining the switching time interval and the light migration drop. The larger the brightness migration function, the greater the influence of the current illumination factor on the display, the poorer the control effect, and the less control is needed. Further introduce the error term. The greater the difference between the actual display image and the pre-input screen, the more distorted the current display content is, and the more control is needed. Therefore, the energy-saving control function can be obtained by combining the three information features. It can be judged whether energy-saving adjustment is needed at the current moment by the output value of the energy-saving control function. The control of energy-saving adjustment by the energy-saving control function can effectively avoid the sensitivity of advertising machine control, making the energy-saving control process more energy-saving while also ensuring the display quality of the advertising machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A flow chart of an energy-saving control method for an outdoor advertising machine provided by an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of the structure of an intelligent screen control module of an outdoor advertising machine provided by an embodiment of the present invention;

[0034] Figure 3 A schematic diagram of a negative regulation fitting curve provided by an embodiment of the present invention;

[0035] Figure 4 A schematic diagram of a forward control amount fitting curve provided by an embodiment of the present invention;

[0036] Figure 5 A comparison diagram of a screen light brightness diagram and a pre-input image provided by an embodiment of the present invention;

[0037] Figure 6A schematic diagram of a target pixel and a comparison pixel provided by an embodiment of the present invention;

[0038] Figure 7 This is a comparison chart of power consumption of an outdoor advertising machine provided by one embodiment of the present invention before and after the embodiment is applied. DETAILED DESCRIPTION

[0039] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the energy-saving control method of an outdoor advertising machine proposed by the present invention, its specific implementation method, structure, features and effects are described in detail below in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0040] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0041] The embodiment of the present invention is directed to an outdoor advertising machine with energy-saving and control functions. The display screen of the outdoor advertising machine is composed of multiple light-emitting diodes, which are responsible for generating light and forming images. Each LED module contains multiple LED dot matrices, each dot matrix can display one pixel, and multiple LED modules are combined to form a unit board, and multiple unit boards form a complete display screen. The schematic diagram of the intelligent screen control module structure of this type of outdoor advertising machine is shown in FIG. Figure 2 As shown, the intelligent screen control of this type of advertising machine includes a power supply circuit, a signal input circuit, an energy-saving control circuit, a drive circuit, a communication circuit and a protection circuit. The integrated sensor is connected to the signal input circuit, and environmental information is collected through the integrated sensor. After input into the circuit, commands such as energy-saving control are executed; remote collaborative data interaction is used to perform information interaction, storage and other functions on the control log, as well as transmission of display content. For each control process of the advertising machine, the energy-saving control signal is input to the drive circuit. The signal is first power-amplified by the amplifier circuit to match the power level required by the LED screen. Subsequently, the pulse width modulation (PWM) technology is used to precisely modulate the amplified signal. PWM technology controls the average voltage of the output signal by adjusting the width ratio of the pulse, thereby achieving fine control of the current of the LED pixel point, ensuring that each pixel point can obtain uniform and stable brightness performance. The drive circuit accurately adjusts the current of the screen backlight or LED module based on the amplified and modulated control signal to achieve efficient brightness adjustment and energy consumption control, thereby optimizing the display effect and energy efficiency performance of the entire screen.

[0042] The specific scheme of the energy-saving control method of an outdoor advertising machine provided by the present invention is described in detail below with reference to the accompanying drawings.

[0043] See also Figure 1 , which shows a flow chart of an energy-saving control method for an outdoor advertising machine provided by an embodiment of the present invention, the method comprising:

[0044] Step S1: Obtain the control records of the outdoor advertising machine within a preset historical time period; fit the positive control amount and the negative control amount in the control record respectively, and obtain the control amount upper limit schedulable function according to the difference between the negative control amount fitting curve and the positive control amount fitting curve.

[0045] For outdoor advertising machines, their initial control strategy generally includes the triggering conditions of all environmental factors. Every time energy-saving control occurs, the system will record the events and conditions that trigger the control, including the environmental parameters before and after the control and the operating status of the advertising machine. Therefore, the control records of the outdoor advertising machine within the preset historical time period can be obtained for statistics and analysis. In the embodiment of the present invention, the preset historical time period is set to within three months.

[0046] The control record contains the control amount of each control, where the control amount is an absolute value, which is divided into two directions: negative control and positive control during the control process. In the embodiment of the present invention, the constant brightness of the display screen of the outdoor advertising machine is 2000CD / square meter. The difference between the brightness value after each control record and the constant brightness is obtained. The absolute value of the difference is the control amount. The positive and negative signs of the difference indicate the control direction. A positive number indicates that brightness compensation has been performed and additional energy consumption has occurred; a negative number indicates energy-saving control.

[0047] Because outdoor advertising machines are affected by a variety of environmental factors during the control process, some focus on controlling according to traffic flow to achieve better energy-saving display effects, while others focus on controlling according to ambient light, temperature and humidity to achieve better energy-saving display effects. In order to analyze the characteristics of the current control strategy of outdoor advertising machines, it is necessary to analyze the positive control and negative control results separately, fit the positive control amount and negative control amount in the control record respectively, and evaluate the control amount characteristics at each moment through the fitting curve.

[0048] See also Figure 3 and Figure 4 , Figure 3 FIG. 1 shows a schematic diagram of a negative regulation fitting curve provided by an embodiment of the present invention. Figure 4 FIG. 1 shows a schematic diagram of a forward control amount fitting curve provided by an embodiment of the present invention. Figure 3 and Figure 4It can be seen that the fitting result of the negative control amount fitting curve representing throttling is too large, and the fitting result of the positive control amount fitting curve representing compensation is too small. This is because the main control strategy of the advertising machine is based on throttling. Therefore, based on the difference between the negative control amount fitting curve and the positive control amount fitting curve, the control amount upper limit schedulable function can be obtained, that is, the maximum result of the control amount upper limit schedulable function can be regarded as the control result of maximizing throttling and minimizing compensation. The maximum result is the control upper limit when constraining the outdoor advertising machine to perform throttling control, which can be used for the final energy-saving control function.

[0049] Preferably, in one embodiment of the present invention, considering that the parameters of the fitting function need to be continuously changed during the fitting process, it is ensured that the fitting curve has a reasonable fitting result, such as Figure 3 and Figure 4 It can be seen that the purpose of the fitting curve in the embodiment of the present invention is to simplify the actual control amount curve and retain its trend and overall numerical characteristics. Therefore, in order to achieve the fitting result, the fitting process needs to be controlled according to the loss function during the fitting process. Therefore, the fitting method of the negative control amount fitting curve and the positive control amount fitting curve includes:

[0050] Because the fitting method of the positive control amount and the negative control amount in the embodiment of the present invention is the same, any one dimension of the positive control amount and the negative control amount is used as the target dimension, and the data of the target dimension is fitted. In the fitting process, all target extreme value points of the fitting curve are obtained. If the target dimension is the positive control amount dimension, the target extreme value point is the minimum point, and if the target dimension is the negative control amount dimension, the target extreme value point is the maximum point. For each data point on the fitting curve, the average data value of the two adjacent target extreme value points is used as the reference value, and the difference between the data point and the reference value is used as the first fitting deviation.

[0051] Because the negative control value dimension represents the throttling curve, it is necessary to pay attention to the maximum value point when fitting the curve. Conversely, the positive control value dimension is the compensation curve, and it is necessary to pay attention to the minimum value point. That is, the first fitting deviation uses the average data value of the extreme point as the reference value. By limiting the fitting function by the first fitting deviation, the overall trend can be retained and the fitting curve can be simplified.

[0052] The difference between the data value of each target extreme point and the actual value is taken as the second fitting deviation. The second fitting deviation is the fitting deviation in the conventional fitting process. Therefore, the first fitting deviation and the second fitting deviation are combined, and all the first fitting deviations and all the second fitting deviations are accumulated and summed to obtain the overall fitting deviation. That is, the overall fitting deviation is the loss value in the fitting process. When the overall fitting deviation is the smallest, the fitting is considered to be completed and the fitting process is stopped.

[0053] In an embodiment of the present invention, the upper limit schedulable function of the control amount is obtained by subtracting the positive control amount fitting curve from the negative control amount fitting curve.

[0054] It should be noted that, because the schedulable function of the upper limit of the control amount is obtained based on historical data statistics, it has the characteristic of being updateable. In the embodiment of the present invention, the schedulable function of the upper limit of the control amount is obtained by the server through big data statistics, and is updated every three months. The updated function data can be sent to the corresponding outdoor advertising machine. And because the schedulable function of the upper limit of the control amount is obtained based on historical data statistics, it represents the information in the historical data, and the embodiment of the present invention is intended to make a judgment on the real-time adjustment and control. In order to make the information corresponding to the current moment more accurate, in the embodiment of the present invention, all environmental factors at the current moment are compared with the environmental factors at each moment in the preset historical time period for similarity, and the schedulable function value in the schedulable function of the upper limit of the control amount at a historical moment with the greatest similarity is selected as the schedulable function value at the current moment for the subsequent construction of the energy-saving control function. It should be noted that the similarity can be selected as cosine similarity, and the environmental factors are quantified into a sequence. The similarity of environmental factors between different time periods is obtained by calculating the cosine similarity between the two sequences.

[0055] Step S2: for the current moment, obtain the switching time interval of the current screen, the pre-input screen of the advertising machine, and the screen light intensity map of the same size as the pre-input screen; obtain high-brightness pixels and low-brightness pixels on the pre-input screen, and obtain high-illuminance pixels and low-illuminance pixels in the screen light intensity map; in the pre-input screen, use the high-brightness and high-illuminance pixels as the target pixels, the nearest low-brightness and low-illuminance pixels of the target pixels as the first comparison point, and the nearest low-brightness and high-illuminance pixels as the second comparison point; obtain the light migration influence value of the target pixel according to the distribution and brightness difference between the target pixel and the two comparison points; obtain the overall light migration influence value of the current moment according to the distribution of the light migration influence values ​​of all target pixels.

[0056] In the actual use of outdoor advertising machines, when the screen switches and the light environment changes quickly, it will cause multiple adjustments in a short period of time. These complicated adjustment processes not only fail to achieve the purpose of energy saving, but also are affected by environmental factors, resulting in the effect of the adjustment being not obvious. Therefore, it is necessary to further analyze the current situation of the advertising machine screen being affected by the light environment and the energy consumption required to balance the display effect. That is, the greater the consumption, the less transitional adjustment is needed at this time.

[0057] The embodiment of the present invention first counts the switching time interval of the current screen, that is, the time interval between the current screen and the next screen. The pre-input screen of the advertising machine at the current moment is obtained, that is, the screen currently displayed on the screen. A screen light brightness map of the same size as the pre-input screen is obtained. The screen light brightness map is obtained based on the photodiodes on the display screen. The positions of the photodiodes can be regarded as the positions of the pixels in the pre-input screen. Therefore, the illumination information obtained by each photodiode can constitute a screen light brightness map of the same size, that is, each pixel position in the screen light brightness map represents the amount of illumination received at this time, and the pre-input screen represents the information of the screen displayed at the current moment. Please refer to Figure 5 , which shows a comparison diagram of a screen light brightness diagram and a pre-input picture provided by an embodiment of the present invention, Figure 5 The left half is the screen light brightness diagram, and the right half is the pre-input screen.

[0058] Further obtain high-brightness pixels and low-brightness pixels on the pre-input screen, and obtain high-illuminance pixels and low-illuminance pixels in the screen light illumination map. In the pre-input screen, if a pixel is located at a high-brightness and high-illuminance pixel, then the pixel does not need high-brightness compensation. However, if the pixel is close to a low-brightness pixel area, and high-illuminance pixels have already appeared in the low-brightness pixel area, it means that the ambient light may have a tendency to migrate to this area. In order to balance the display smoothness, the advertising opportunity uses more energy to compensate for the brightness of the low-brightness area, resulting in frequent unnecessary adjustments. Therefore, the embodiment of the present invention needs to analyze the category distribution information of the pixel, take the high-brightness and high-illuminance pixel as the target pixel, select the nearest low-brightness and low-illuminance pixel of the target pixel as the first comparison point, and the nearest low-brightness and high-illuminance pixel as the second comparison point. The light migration impact value of the target pixel can be obtained by analyzing the distribution and brightness difference between the target pixel and the two comparison points. Please refer to Figure 6 , which shows a schematic diagram between a target pixel and a comparison pixel provided by an embodiment of the present invention, wherein point Q is the target pixel, point Q1 is the first comparison point, and point Q2 is the second comparison point. In order to more clearly characterize the distribution, the lower half of the image is divided into two areas: low brightness and low illumination, and low brightness and high illumination.

[0059] Preferably, in one embodiment of the present invention, the sampling Otsu threshold algorithm is used to process the pre-input image and the screen light luminance map to obtain high-brightness pixels and low-brightness pixels on the pre-input image, and high-illuminance pixels and low-illuminance pixels in the screen light luminance map. It should be noted that the Otsu threshold algorithm is a technical means well known to those skilled in the art, and can adaptively obtain the optimal threshold to divide the pixels in the image into two categories, and the specific content will not be repeated.

[0060] Preferably, in one embodiment of the present invention, the method for obtaining the light migration impact value includes:

[0061] A vector pointing from the target pixel point to the first comparison point is used as a first vector, a vector pointing from the target pixel point to the second comparison point is used as a second vector, and a Euclidean norm between the first vector and the second vector is obtained.

[0062] A first brightness difference between the target pixel and the first comparison point is obtained, a second brightness difference between the first comparison point and the second comparison point is obtained, and the ratio of the first brightness difference to the second brightness difference is used as a brightness compensation feature. The larger the first brightness difference, the greater the visual drop around the target pixel, and the smaller the second brightness difference, the greater the light has migrated to the same low-brightness area. At this time, the additional brightness compensation generated by the screen may be greater, so the brightness compensation feature is greater.

[0063] After the Euclidean norm negative correlation is mapped and normalized, it is multiplied with the brightness compensation feature to obtain the light migration impact value. The result of the Euclidean norm negative correlation mapping and normalization can be regarded as the similarity between the two vectors, that is, the closer the size and direction between the two vectors are, the greater the light migration impact value is, so the light migration impact value can be obtained by multiplying the vector similarity with the brightness compensation feature.

[0064] In an embodiment of the present invention, the method of negative correlation mapping and normalization is: taking the opposite of the Euclidean norm as the power of an exponential function with a natural constant as the base, and the mapping result of the exponential function is the final negative correlation mapping and normalization result. In other embodiments of the present invention, other basic mathematical means may also be used to achieve negative correlation mapping and normalization, which will not be described in detail here.

[0065] After obtaining the light migration impact value of each target pixel point, the overall light migration impact value of the entire advertising machine screen at the current moment can be obtained by statistically analyzing the distribution of all light migration impact values.

[0066] Preferably, in an embodiment of the present invention, the average light migration impact value of all target pixels is obtained, and the average light migration impact value is multiplied by the number ratio of the target pixels in the pre-input image to obtain the overall light migration impact value. That is, the number ratio is used as a weight, that is, the greater the ratio of the target pixels, the greater the impact on the image display; the greater the average light migration impact value, the greater the degree and scale of light migration, and the greater the overall light migration impact value.

[0067] Step S3: Obtain the light migration difference at the current moment according to the current change of the photodiode on the screen, and obtain the brightness migration function at the current moment according to the switching time interval, the overall light migration impact value, and the light migration difference.

[0068] When strong light shines on the screen, the photodiode at the corresponding position will produce a current change, generate an increased current, the magnitude of the current increases, and the current signal trend is positive. Therefore, the light migration difference at the current moment can be further obtained based on the current change of the photodiode on the screen. That is, the light migration difference represents the difference between the light irradiation area and other areas, and also represents the amount of energy consumption generated by other areas during the regulation process.

[0069] Combining the switching time interval, the overall light migration impact value, and the light migration drop, the brightness migration function at the current moment can be obtained. That is, the smaller the switching time interval, the more frequent the picture changes, and the more frequent the screen adjustment process at this time; the larger the overall light migration impact value and the light migration drop, the more obvious the contrast between the picture brightness and the light brightness on the screen at this time, the greater the impact of light on the screen, and the more frequent the adjustment.

[0070] Preferably, in one embodiment of the present invention, the method for obtaining the light migration drop includes:

[0071] When the light on the screen is obviously uneven, direct light or light migration in the direct direction may occur, resulting in a light spot on the screen. The light at the light spot is significantly higher than the light in other areas. Therefore, at the current moment, among the unit boards on the screen, the unit board with the largest sum of photodiode currents is used as the light spot unit board, and the other unit boards are background unit boards. The difference between the average increased current of the photodiode in the light spot unit board and the average increased current of the photodiode in the background unit board at the current moment is used as the light migration drop.

[0072] Preferably, in one embodiment of the present invention, the method for obtaining the brightness transfer function includes:

[0073] The sum of the light migration drop and the overall light migration impact value is used as the light impact feature; the switching time interval is negatively correlated and normalized and then multiplied with the light impact feature to obtain a brightness migration function. It should be noted that the negative correlation mapping and normalization method in the embodiment of the present invention can be implemented using the same mathematical means, which is not limited or elaborated herein.

[0074] Step S4: Obtain an energy-saving control function according to the brightness migration function, the upper limit schedulable function of the control amount, and the error term; the error term is obtained by the difference between the actual display image and the pre-input image; and determine whether energy-saving adjustment is required at the current moment according to the energy-saving control function.

[0075] The result of the energy-saving control function at the current moment can be obtained through the analysis and data acquisition of the above steps. The larger the value of the brightness migration function, the smaller the regulation effect at this time and the additional energy consumption will be generated, which is not suitable for regulation, and the result of the energy-saving control function is smaller; the upper limit of the regulation amount schedulable function represents the upper limit of the schedulable value at the current moment. The larger the result of this function, the greater the advertising machine can use the throttled power for brightness compensation under the premise of saving energy and not increasing additional power supply. The greater the necessity of regulation, the greater the result of the energy-saving control function. Further introducing the error term, the error term is obtained by the difference between the actual display image and the pre-input screen. By introducing the error term, the distortion of the display content can be avoided, so that the screen can be effectively compensated. Therefore, according to the energy-saving function, it can be judged whether energy-saving adjustment is needed at the current moment.

[0076] Preferably, in one embodiment of the present invention, the method for obtaining the error term includes:

[0077] The pre-input image is fused with the screen light intensity map to obtain the actual display image. That is, the actual display image is not the image actually displayed on the screen, but can be regarded as the display result of the human eye vision at this time, which is a virtual simulation result. In the embodiment of the present invention, the method of fusing the pre-input image with the screen light intensity map is to add and average the pixel values ​​at the corresponding positions to obtain the fusion result.

[0078] The mean square error between the actual display image and the pre-input image is multiplied by the preset error weight to obtain the error term. It should be noted that the method for obtaining the mean square error is a technical means well known to those skilled in the art, and will not be described in detail in the embodiment of the present invention. In the embodiment of the present invention, the error weight is set to 0.4. The role of the error weight is to reduce the influence of the error term in the energy-saving control function to avoid excessive sensitivity.

[0079] Preferably, in one embodiment of the present invention, the energy-saving control function is obtained by subtracting the brightness migration function from the upper limit schedulable function of the control amount and then adding the error term.

[0080] In the embodiment of the present invention, a control threshold can be set. When the output value of the energy-saving control function is greater than the control threshold, it means that adjustment can be made at this time, otherwise no adjustment is required. Since the upper limit of the control amount can be scheduled to constrain the outdoor advertising machine to introduce additional electricity from the power grid when compensating for its screen brightness, and the brightness migration function constrains the necessity of adjustment, the final control signal can effectively avoid the problem of over-adjustment in the control process and save energy consumption to the greatest extent. In addition, the error term can also avoid the distortion of the actual display content; then the final energy-saving control signal can further achieve energy-saving effects based on the original outdoor advertising machine design and control strategy. Please refer to Figure 7, which shows a comparison of power consumption of an outdoor advertising machine provided by an embodiment of the present invention before and after the application of the embodiment, Figure 7 Multiple advertising machines are listed in the table. Among the control measurement items, "original" corresponds to the existing control strategy, and "new" corresponds to the control strategy of this embodiment. Under the original control strategy, the average daily power consumption of outdoor advertising machines is about 5 degrees. After testing, the energy-saving control strategy of this embodiment can save about 12%-16% of electricity.

[0081] In summary, the embodiment of the present invention first counts the control records of the historical time period, obtains the upper limit schedulable function of the control amount, further analyzes the relationship between illumination and screen display, uses the screen illumination brightness diagram and the distribution and brightness relationship between different categories of pixel points on the pre-input screen to determine the overall light migration impact value at the current moment, and combines the switching time interval and the light migration drop to obtain the brightness migration function. The error term is introduced, and the energy-saving control function can be obtained by combining the three information features. The output value of the energy-saving control function can be used to determine whether energy-saving adjustment is needed at the current moment. The embodiment of the present invention can effectively avoid the sensitivity of advertising machine regulation by controlling the energy-saving adjustment through the energy-saving control function, making the energy-saving regulation process more energy-saving while also ensuring the display quality of the advertising machine.

[0082] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0083] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. An energy-saving control method for an outdoor advertising machine, characterized in that: The method comprises: Obtain the control records of the outdoor advertising machine within a preset historical time period; respectively fit the positive control amount and the negative control amount in the control record, and obtain the control amount upper limit schedulable function according to the difference between the negative control amount fitting curve and the positive control amount fitting curve; For the current moment, obtain the switching time interval of the screen at the current moment, the pre-input screen of the advertising machine, and the screen light brightness map of the same size as the pre-input screen; obtain the high-brightness pixel points and low-brightness pixel points on the pre-input screen, and obtain the high-illuminance pixel points and low-illuminance pixel points in the screen light brightness map; in the pre-input screen, use the high-brightness and high-illuminance pixel points as the target pixel points, the nearest low-brightness and low-illuminance pixel points of the target pixel points as the first comparison point, and the nearest low-brightness and high-illuminance pixel points as the second comparison point; obtain the light migration influence value of the target pixel points according to the distribution and brightness difference between the target pixel points and the two comparison points; obtain the overall light migration influence value of the current moment according to the distribution of the light migration influence values ​​of all target pixels; Obtaining the light migration difference at the current moment according to the current change of the photodiode on the screen, and obtaining the brightness migration function at the current moment according to the switching time interval, the overall light migration impact value, and the light migration difference; An energy-saving control function is obtained according to the brightness migration function, the upper limit schedulable function of the control amount and the error term; the error term is obtained by the difference between the actual displayed image and the pre-input image; and it is determined whether energy-saving adjustment is required at the current moment according to the energy-saving control function.

2. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The fitting method of the negative control amount fitting curve and the positive control amount fitting curve includes: For any dimension of the positive control amount and the negative control amount as the target dimension, the data of the target dimension is fitted, and in the fitting process, all target extreme value points of the fitting curve are obtained; if the target dimension is the positive control amount dimension, the target extreme value point is the minimum value point, and if the target dimension is the negative control amount dimension, the target extreme value point is the maximum value point; For each data point on the fitting curve, the average data value of the two adjacent target extreme points is taken as the reference value, and the difference between the data point and the reference value is taken as the first fitting deviation; the difference between the data value of each target extreme point and the actual value is taken as the second fitting deviation; all the first fitting deviations and all the second fitting deviations are accumulated and summed to obtain the overall fitting deviation; the fitting process is stopped when the overall fitting deviation is the smallest.

3. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the schedulable function of the upper limit of the control amount includes: The upper limit schedulable function of the control amount is obtained by subtracting the positive control amount fitting curve from the negative control amount fitting curve.

4. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The pre-input image and the screen light luminance map are processed using the Otsu threshold algorithm to obtain high-brightness pixels and low-brightness pixels on the pre-input image, and high-illuminance pixels and low-illuminance pixels in the screen light luminance map.

5. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the light migration impact value includes: The vector pointing from the target pixel point to the first comparison point is used as a first vector, the vector pointing from the target pixel point to the second comparison point is used as a second vector, and the Euclidean norm between the first vector and the second vector is obtained; Obtaining a first brightness difference between a target pixel and the first comparison point, obtaining a second brightness difference between the first comparison point and the second comparison point, and using a ratio of the first brightness difference to the second brightness difference as a brightness compensation feature; The Euclidean norm negative correlation is mapped and normalized, and then multiplied with the brightness compensation feature to obtain the light migration impact value.

6. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the overall light migration impact value includes: The average light migration impact value of all target pixels is obtained, and the average light migration impact value is multiplied by the proportion of the number of target pixels in the pre-input picture to obtain the overall light migration impact value.

7. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the light migration difference includes: At the current moment, among the unit panels on the screen, the unit panel with the largest sum of photodiode currents is used as the light spot unit panel, and the other unit panels are used as background unit panels; the difference between the average increased current of the photodiodes in the light spot unit panel and the average increased current of the photodiodes in the background unit panel at the current moment is used as the light migration drop.

8. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the brightness transfer function includes: The sum of the light migration drop and the overall light migration impact value is taken as a light impact feature; the switching time interval is negatively correlated mapped and normalized, and then multiplied with the light impact feature to obtain the brightness migration function.

9. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the error term includes: The pre-input picture is merged with the screen light luminance map to obtain the actual display image, and the mean square error between the actual display image and the pre-input picture is multiplied by a preset error weight to obtain the error term.

10. The energy-saving control method of an outdoor advertising machine according to claim 1, characterized in that: The method for obtaining the energy-saving control function includes: The energy-saving control function is obtained by subtracting the brightness migration function from the upper limit schedulable function of the control amount and then adding the error term.

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