A screen intelligent adjustment method for educational tablet computer based on image processing

Abstract

The present invention relates to the field of tablet computer eye protection technology, and in particular to a method for intelligently adjusting the screen of an educational tablet computer based on image processing. The present invention collects light luminance, preliminarily determines the screen display brightness based on the light luminance, periodically collects image information, obtains portrait features, determines the area of ​​the highlight region based on the portrait features, determines whether the screen display brightness is qualified based on the area of ​​the highlight region or the dispersion of the highlight region, generates corresponding processing instructions based on the judgment result, and transmits the corresponding processing instructions to the corresponding components so that the components receiving the instructions re-determine their operating parameters to ensure that the display brightness is qualified. The present invention effectively realizes intelligent recognition and precise adjustment of the screen brightness of the educational tablet computer based on the highlight region of the portrait face in the image information, effectively improving the use efficiency of the educational tablet computer.

Description

Technical Field

[0001] The present invention relates to the technical field of tablet computer eye protection, and in particular to an image processing-based intelligent screen adjustment method for an educational tablet computer. Background Art

[0002] An educational tablet is a tablet designed specifically for educational purposes. Pre-installed with a variety of educational resources, including course tutoring software and extracurricular development software, it provides users with a convenient learning platform, helping students learn knowledge at any time and improve their learning literacy. During use, the screen brightness of an educational tablet must meet the needs of the user's eyes. Since the user's learning environment is ever-changing, the ambient light intensity can change. Therefore, research on the screen brightness of educational tablets can help educational tablets adapt to different learning environments and have a suitable effect on the user's eyes, thereby increasing the usage rate of educational tablets.

[0003] Chinese patent publication number: CN117472315B, discloses a tablet computer eye protection system and method, the system includes an application data acquisition module, a touch sensing module, an environmental sensing module, and a processor, the processor being configured to: obtain user usage data from the application data acquisition module, the touch sensing module, and the environmental sensing module, the user usage data including a sequence of images presented by the tablet computer and user operation data on the tablet computer within a first preset time period, the first preset time period including at least the current moment, the operation data including application usage data and environmental data; based on the user usage data, evaluate the user's cumulative eye fatigue value; and determine eye protection parameters and eye protection prompt information based on the cumulative eye fatigue value, the eye protection parameters including at least one of an adjustment amount for the tablet computer's screen color temperature and an adjustment amount for the screen brightness.

[0004] This shows that the above solution provides eye protection by adjusting the tablet's parameters according to the user's eye fatigue. However, the above solution cannot intelligently identify and accurately adjust the screen brightness of the educational tablet based on the highlight areas of the face in the image information, thus failing to ensure the efficient use of the educational tablet. Summary of the Invention

[0005] To this end, the present invention provides an intelligent screen adjustment method for an educational tablet computer based on image processing, which is used to overcome the problem in the prior art that the screen brightness of the educational tablet computer cannot be intelligently identified and accurately adjusted based on the highlight area of ​​the face of a portrait in image information, resulting in low utilization efficiency of the educational tablet computer.

[0006] To achieve the above objectives, the present invention provides an intelligent screen adjustment method for an educational tablet computer based on image processing, comprising:

[0007] Collect the light intensity of the environment where the educational tablet computer is located;

[0008] Preliminarily determining the display brightness of the screen of the educational tablet computer based on the collected light illuminance;

[0009] Periodically collect image information of the area facing the screen and process the image information to obtain portrait features;

[0010] Determine the highlight area of ​​the face of the portrait according to the portrait features and calculate the area of ​​the highlight area;

[0011] Determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region or the dispersion of the highlight, and generating corresponding processing instructions according to the determination result;

[0012] Transmitting the corresponding processing instruction to the corresponding component so that the component receiving the instruction re-determines its operating parameters so that the display brightness is qualified;

[0013] When it is determined that the display brightness of the screen is qualified, the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected.

[0014] Furthermore, the process of determining the highlight region of the face of the portrait according to the portrait feature and counting the area of ​​the highlight region includes:

[0015] intercepting a facial region of the portrait face in the portrait feature;

[0016] determining the brightness of each sub-region in the facial region;

[0017] Comparing each of the brightnesses with the light luminance to sequentially determine a brightness difference value corresponding to each of the sub-areas;

[0018] Calculating the difference between each of the brightness difference values ​​and the preset brightness difference value in sequence, and recording the obtained difference value as the secondary brightness difference value;

[0019] When a single secondary brightness difference value is greater than zero, the sub-region corresponding to the brightness difference value is recorded as a highlight region;

[0020] The areas of the highlight regions are counted, and the sum of the obtained areas is recorded as the highlight region area.

[0021] Furthermore, the process of determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region includes:

[0022] Comparing the area of ​​the highlight region with the pre-stored preset area of ​​the highlight region;

[0023] When the area of ​​the highlight region is smaller than the first preset area of ​​the highlight region, determining that the display brightness of the screen is qualified, completing the periodic acquisition of the image information of the area facing the screen, and continuously acquiring the image information of the area facing the screen;

[0024] When the area of ​​the highlight region is greater than or equal to the first preset area of ​​the highlight region and smaller than the second preset area of ​​the highlight region, determining that the display brightness of the screen is unqualified, and determining whether the display brightness of the screen is qualified based on the highlight dispersion;

[0025] When the area of ​​the highlight region is greater than or equal to the area of ​​the second preset highlight region, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

[0026] Furthermore, the process of determining whether the display brightness of the screen is qualified based on the highlight dispersion includes:

[0027] For each highlight region, the highlight region closest to the highlight region is recorded as an adjacent highlight region, and the distance between the highlight region and the adjacent highlight region is calculated. The obtained distance is recorded as the distribution distance for the highlight region. After the distribution distance of each highlight region is obtained, the average value of the distribution distances is calculated, and the obtained average value is recorded as the highlight dispersion.

[0028] When the highlight dispersion is greater than a preset highlight dispersion, determining that the display brightness of the screen is qualified, and correcting the preset brightness difference value based on the highlight dispersion;

[0029] When the highlight dispersion is less than or equal to the preset highlight dispersion and the highlight area is concentrated on one side of the facial area, determining that a light source exists on one side of the environment area where the screen is located, and dividing the environment area to determine whether the display brightness of the screen is qualified;

[0030] When the highlight dispersion is less than or equal to the preset highlight dispersion and the highlight area is concentrated in the center of the facial area, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

[0031] Furthermore, the process of correcting the preset brightness difference value based on the highlight dispersion includes:

[0032] Calculating a difference between the highlight dispersion and the preset highlight dispersion, and recording the obtained difference as a dispersion difference;

[0033] The preset brightness difference is increased based on the discreteness difference, and the increase amplitude of the preset brightness difference is proportional to the discreteness difference.

[0034] Furthermore, the process of dividing the environmental area into regions to determine whether the display brightness of the screen is qualified includes:

[0035] dividing the environmental area into regions;

[0036] Obtaining a facial center point, wherein the facial center point is the geometric center point of the contour of the facial region;

[0037] Based on the facial center point, tangent lines are drawn outward along the two side edges of each highlight area, and the area enclosed by each tangent line and the edge of the environment area is recorded as the detection area;

[0038] intercepting the portrait area in the portrait feature;

[0039] removing the detection area and the portrait area from the environment area, and recording the area obtained after the removal as a comparison area;

[0040] The average brightness of the detection area is recorded as the detection area average brightness, and the average brightness of the comparison area is recorded as the comparison area average brightness;

[0041] Calculating the difference between the average brightness of the detection area and the average brightness of the comparison area, and recording the obtained difference as the regional brightness difference;

[0042] When the area brightness difference is greater than the preset area brightness difference, the display brightness of the screen is determined to be qualified, and the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected;

[0043] When the regional brightness difference is less than or equal to the preset regional brightness difference, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

[0044] Furthermore, the process of determining the actual distance between the portrait face and the screen according to the portrait features includes:

[0045] determining an eye region of the face of the portrait according to the portrait features;

[0046] Obtaining eye coordinates in the eye area;

[0047] performing distortion correction on the eye coordinates;

[0048] The distance between the eye coordinates and the screen is measured, and the obtained distance is recorded as the actual distance.

[0049] Furthermore, the process of correcting the display brightness of the screen based on the actual distance includes:

[0050] Comparing the actual distance with a pre-stored preset actual distance;

[0051] The display brightness is reduced based on the actual distance, and the reduction degree of the display brightness is inversely proportional to the actual distance.

[0052] Furthermore, after the display brightness is reduced, the process of adjusting the color temperature of the screen according to the interval in which the display brightness of the reduced screen is located includes:

[0053] Determining the interval in which the display brightness of the screen after being reduced is located, and recording the determined interval as a brightness interval;

[0054] The color temperature is reduced based on the brightness interval, and the reduction range of the color temperature is inversely proportional to the numerical range of the brightness interval.

[0055] Furthermore, after the color temperature is lowered, the process of re-determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region includes:

[0056] re-determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region;

[0057] When the area of ​​the highlight area is larger than the area of ​​the second preset highlight area, it is determined that the processing of the image information does not meet the standards, resulting in a deviation in the measurement of the actual distance, historical image information is obtained, and the range interval of the eye coordinates is obtained based on each historical image information, the center point is obtained from each range interval, the obtained center point is used as the eye coordinate, and the actual distance between the eye coordinates and the screen is remeasured.

[0058] Compared with the prior art, the beneficial effect of the present invention lies in that the present invention determines whether the display brightness of the screen is qualified based on the area of ​​the highlight area, can quickly and accurately complete the judgment on whether the display brightness of the screen is qualified, and effectively realizes the intelligent recognition of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information. When it is determined that the display brightness of the screen is unqualified, it determines whether the display brightness of the screen is qualified based on the highlight discreteness. It further realizes the intelligent recognition of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, and generates corresponding processing instructions according to the judgment result, effectively realizes the precise adjustment of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, and effectively improves the use efficiency of the educational tablet computer.

[0059] Furthermore, by determining the area of ​​the highlight area based on the facial area of ​​the portrait face according to the portrait features, the area of ​​the highlight area can be accurately determined, which helps to quickly and accurately determine whether the display brightness of the screen is qualified, further improving the use efficiency of the educational tablet computer.

[0060] Furthermore, the screen display brightness is judged to be qualified based on the highlight dispersion, which can more accurately judge whether the screen display brightness is qualified and avoid misjudgment. While further realizing the intelligent recognition of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, the utilization efficiency of the educational tablet computer is further improved.

[0061] Furthermore, the preset brightness difference is added based on the discreteness difference, which effectively avoids the misjudgment of whether the screen display brightness is qualified due to the preset brightness difference not meeting the standard. While further realizing the precise adjustment of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, the utilization efficiency of the educational tablet computer is further improved.

[0062] Furthermore, when the highlight dispersion is less than or equal to the preset highlight dispersion and the highlight area is concentrated on one side of the facial area, the environmental area is divided into areas to determine whether the display brightness of the screen is qualified, thereby avoiding misjudgment of the screen display brightness between qualified and unqualified. While further realizing the intelligent recognition of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, the utilization efficiency of the educational tablet computer is further improved.

[0063] Furthermore, when the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined based on the portrait features. The determination of the actual distance can more effectively correct the display brightness of the screen, while further realizing the precise adjustment of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, and further improving the utilization efficiency of the educational tablet computer.

[0064] Furthermore, by reducing the display brightness of the screen based on the actual distance, the display brightness of the screen can be reduced quickly and accurately, so that the display brightness of the screen is qualified and in line with the usage environment. While further realizing the precise adjustment of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, the utilization efficiency of the educational tablet computer is further improved.

[0065] Furthermore, after the display brightness is reduced, the color temperature of the screen is adjusted according to the range of the reduced display brightness of the screen, effectively ensuring the balance between the display brightness and the color temperature of the screen, so that the display brightness of the screen is qualified and more in line with the usage environment. While further realizing the precise adjustment of the screen brightness of the educational tablet computer based on the highlight area of ​​the portrait face in the image information, the utilization efficiency of the educational tablet computer is further improved.

[0066] Furthermore, after the color temperature is lowered, the screen display brightness is re-determined to be qualified based on the area of ​​the highlight region, and the screen brightness of the educational tablet computer is further intelligently identified based on the highlight region of the portrait face in the image information. When it is determined that the processing of the image information does not meet the standards, resulting in a deviation in the measurement of the actual distance, the range interval of the eye coordinates is obtained based on each historical image information, and the center point is obtained from each range interval. The obtained center point is used as the eye coordinate, and the actual distance between the eye coordinates and the screen is re-measured, so that the actual distance is more accurate, which is conducive to ensuring that the screen display brightness is qualified. While further realizing the precise adjustment of the screen brightness of the educational tablet computer based on the highlight region of the portrait face in the image information, the utilization efficiency of the educational tablet computer is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A structural block diagram of a system using an intelligent screen adjustment method for an educational tablet computer based on image processing;

[0068] Figure 2 This is a flow chart of the method for intelligently adjusting the screen of an educational tablet computer based on image processing according to the present invention;

[0069] Figure 3 This is a flow chart of the present invention for determining whether the display brightness of the screen is qualified;

[0070] Figure 4 This is a flow chart of the present invention for determining the actual distance between a portrait face and a screen and correcting the display brightness of the screen based on the actual distance. DETAILED DESCRIPTION

[0071] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0072] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0073] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside", and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0074] Furthermore, it should be noted that, in the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0075] See also Figure 1 As shown, it is a structural block diagram of a system using an intelligent screen adjustment method for an educational tablet computer based on image processing. The structure of the embodiment of the present invention includes an acquisition module, a display module, a processing module, an analysis module and a control module; wherein the acquisition module is used to collect the light brightness of the environment in which the educational tablet computer is located; the display module is connected to the acquisition module and is used to preliminarily determine the display brightness of the screen of the educational tablet computer based on the collected light brightness; the processing module is connected to the display module and periodically collects image information of the area facing the screen and processes the image information to obtain portrait features; the analysis module is respectively connected to the display module and the processing module and is used to determine the highlight area of ​​the portrait face based on the portrait features and calculate the area of ​​the highlight area. The analysis module is also used to determine whether the display brightness of the screen is qualified based on the area of ​​the highlight area or the highlight dispersion, and generate corresponding processing instructions based on the judgment result. When the display brightness of the screen is determined to be qualified, the periodic collection of the image information of the area facing the screen is completed and the image information of the area facing the screen is continuously collected; the control module is connected to the analysis module and is used to transmit the corresponding processing instructions to the corresponding components so that the components receiving the instructions re-determine their operating parameters to make the display brightness qualified.

[0076] See also Figure 2 As shown in FIG, which is a flow chart of the method for intelligently adjusting the screen of an educational tablet computer based on image processing of the present invention. The method of the embodiment of the present invention includes:

[0077] Collecting the light brightness of the environment where the educational tablet computer is located;

[0078] Preliminarily determining the display brightness of the screen of the educational tablet computer based on the collected light illuminance;

[0079] Periodically collecting the image information of the area facing the screen, and processing the image information to obtain the portrait features;

[0080] Determine the highlight area of ​​the face of the portrait according to the portrait features and count the area of ​​the highlight area;

[0081] Determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region or the highlight dispersion, and generating corresponding processing instructions according to the determination result;

[0082] Transmitting the corresponding processing instruction to the corresponding component so that the component receiving the instruction re-determines its operating parameters so that the display brightness is qualified;

[0083] When it is determined that the display brightness of the screen is qualified, the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected.

[0084] Please continue reading Figure 2 As shown, the process of determining the highlight region of the face of the portrait according to the portrait features and counting the area of ​​the highlight region in the embodiment of the present invention includes:

[0085] intercepting a facial region of the portrait face in the portrait feature;

[0086] determining the brightness of each sub-region in the facial region;

[0087] Comparing the brightness of each sub-region with the light luminance to determine the brightness difference value corresponding to each sub-region in turn;

[0088] The difference between the brightness difference value corresponding to each sub-region and the preset brightness difference value T is calculated in sequence, and the obtained difference value is recorded as the secondary brightness difference value. In this embodiment, the preset brightness difference value T is 43.1 cd / m 2 ;

[0089] When a single secondary brightness difference value is greater than zero, the sub-region corresponding to the brightness difference value is recorded as a highlight region;

[0090] The areas of the highlight regions are counted, and the sum of the obtained areas is recorded as the highlight region area.

[0091] See also Figure 3 As shown in FIG, which is a flow chart of the present invention for determining whether the display brightness of the screen is qualified. The process of determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region in the embodiment of the present invention includes:

[0092] Comparing the area of ​​the highlight region with the pre-stored preset area of ​​the highlight region;

[0093] When the area of ​​the highlight region is smaller than the first preset highlight region area S1, the display brightness of the screen is determined to be qualified, and the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected. In this embodiment, the first preset highlight region area S1 = 3 cm 2 ;

[0094] When the area of ​​the highlight region is greater than or equal to the first preset highlight region area S1 and less than the second preset highlight region area S2, it is determined that the display brightness of the screen is unqualified, and whether the display brightness of the screen is qualified is determined based on the highlight dispersion. In this embodiment, the second preset highlight region area S2 = 67 cm 2 ;

[0095] When the area of ​​the highlight region is greater than or equal to the second preset highlight region area S2, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

[0096] Please continue reading Figure 3 As shown, the process of determining whether the display brightness of the screen is qualified based on the highlight dispersion in the embodiment of the present invention includes:

[0097] For each highlight region, the highlight region closest to the highlight region is recorded as an adjacent highlight region, and the distance between the highlight region and the adjacent highlight region is calculated. The obtained distance is recorded as the distribution distance for the highlight region. After the distribution distance of each highlight region is obtained, the average value of the distribution distances is calculated, and the obtained average value is recorded as the highlight dispersion.

[0098] When the highlight dispersion is greater than a preset highlight dispersion C, the display brightness of the screen is determined to be qualified, and the preset brightness difference is corrected based on the highlight dispersion. In this embodiment, the preset highlight dispersion C=3.28 cm;

[0099] When the highlight dispersion is less than or equal to the preset highlight dispersion C and the highlight area is concentrated on one side of the facial area, determining that a light source exists on one side of the environment area where the screen is located, and dividing the environment area to determine whether the display brightness of the screen is qualified;

[0100] When the highlight dispersion is less than or equal to the preset highlight dispersion C and the highlight area is concentrated in the center of the facial area, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

[0101] Please continue reading Figure 3 As shown, the process of correcting the preset brightness difference value based on the highlight dispersion in the embodiment of the present invention includes:

[0102] Calculating a difference between the highlight dispersion and the preset highlight dispersion, and recording the obtained difference as a dispersion difference;

[0103] increasing the preset brightness difference value based on the discreteness difference value;

[0104] When the dispersion difference is greater than the second preset dispersion difference ΔF2, the preset brightness difference is increased to 1.16 times the initial preset brightness difference. In this embodiment, the second preset dispersion difference ΔF2=0.69 cm.

[0105] When the dispersion difference is less than or equal to the second preset dispersion difference ΔF2 and greater than the first preset dispersion difference ΔF1, the preset brightness difference is increased to 1.11 times the initial preset brightness difference. In this embodiment, the first preset dispersion difference ΔF1=0.38 cm.

[0106] When the dispersion difference is less than or equal to the first preset dispersion difference ΔF1, the preset brightness difference is increased to 1.07 times the initial preset brightness difference.

[0107] Please continue reading Figure 3 As shown, the process of dividing the environment area to determine whether the display brightness of the screen is qualified in the embodiment of the present invention includes:

[0108] dividing the environmental area into regions;

[0109] Obtaining a facial center point, wherein the facial center point is the geometric center point of the contour of the facial region;

[0110] Based on the facial center point, tangent lines are drawn outward along the two side edges of each highlight area, and the area enclosed by each tangent line and the edge of the environment area is recorded as the detection area;

[0111] intercepting the portrait area in the portrait feature;

[0112] removing the detection area and the portrait area from the environment area, and recording the area obtained after the removal as a comparison area;

[0113] The average brightness of the detection area is recorded as the detection area average brightness, and the average brightness of the comparison area is recorded as the comparison area average brightness;

[0114] Calculating the difference between the average brightness of the detection area and the average brightness of the comparison area, and recording the obtained difference as the regional brightness difference;

[0115] When the regional brightness difference is greater than the preset regional brightness difference R, the display brightness of the screen is determined to be qualified, and the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected. In this embodiment, the preset regional brightness difference R is 50 cd / m 2 ;

[0116] When the regional brightness difference is less than or equal to the preset regional brightness difference R, it is determined that the display brightness of the screen is unqualified, and the display brightness of the screen is corrected based on the portrait feature.

[0117] See also Figure 4 As shown in FIG, which is a flow chart of the present invention for determining the actual distance between a portrait face and a screen and correcting the display brightness of the screen based on the actual distance. The process of determining the actual distance between the portrait face and the screen based on the portrait features in the embodiment of the present invention includes:

[0118] determining an eye region of the face of the portrait according to the portrait features;

[0119] Obtaining eye coordinates in the eye area;

[0120] performing distortion correction on the eye coordinates;

[0121] The distance between the eye coordinates and the screen is measured, and the obtained distance is recorded as the actual distance.

[0122] Please continue reading Figure 4 As shown, the process of correcting the display brightness of the screen based on the actual distance in the embodiment of the present invention includes:

[0123] Comparing the actual distance with a pre-stored preset actual distance;

[0124] reducing the display brightness based on the actual distance;

[0125] When the actual distance is greater than a second preset actual distance ΔD2, the display brightness is reduced to 0.96 times the initial display brightness, wherein the second preset actual distance ΔD2 in this embodiment is 28 cm;

[0126] When the actual distance is less than or equal to the second preset actual distance ΔD2 and greater than the first preset actual distance ΔD1, the display brightness is reduced to 0.91 times the initial display brightness, wherein the first preset actual distance ΔD1 in this embodiment is 19 cm;

[0127] When the actual distance is less than or equal to the first preset actual distance ΔD1, the display brightness is reduced to 0.87 times the initial display brightness.

[0128] Please continue reading Figure 4 As shown, the process of adjusting the color temperature of the screen according to the interval of the reduced display brightness of the screen after the display brightness is reduced in the embodiment of the present invention includes:

[0129] Determining the interval in which the display brightness of the screen after being reduced is located, and recording the determined interval as a brightness interval;

[0130] The color temperature is reduced based on the brightness range, and the reduction range of the color temperature is inversely proportional to the brightness range.

[0131] When the brightness interval is within the third preset brightness interval B3, the color temperature is reduced to 0.76 times the initial color temperature, wherein the third preset brightness interval B3 in this embodiment is equal to [190n its, 600n its];

[0132] When the brightness interval is in the second preset brightness interval B2, the color temperature is reduced to 0.89 times the initial color temperature, wherein the second preset brightness interval B2 of this embodiment =∈[120n its,190n its];

[0133] When the brightness interval is in the first preset brightness interval B1, the color temperature is reduced to 0.95 times the initial color temperature, wherein, in this embodiment, the first preset brightness interval B1 =∈[19n its, 120n its].

[0134] Please continue reading Figure 4 As shown, the process of re-determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region after the color temperature is lowered in the embodiment of the present invention includes:

[0135] re-determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region;

[0136] When the area of ​​the highlight area is larger than the area of ​​the second preset highlight area, it is determined that the processing of the image information does not meet the standards, resulting in a deviation in the measurement of the actual distance, historical image information is obtained, and the range interval of the eye coordinates is obtained based on each historical image information, the center point is obtained from each range interval, the obtained center point is used as the eye coordinate, and the actual distance between the eye coordinates and the screen is remeasured.

[0137] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0138] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for intelligently adjusting the screen of an educational tablet computer based on image processing, characterized in that: include: Collect the light intensity of the environment where the educational tablet computer is located; Preliminarily determining the display brightness of the screen of the educational tablet computer based on the collected light illuminance; Periodically collect image information of the area facing the screen and process the image information to obtain portrait features; Determine the highlight area of ​​the face of the portrait according to the portrait features and calculate the area of ​​the highlight area; Determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region or the dispersion of the highlight, and generating corresponding processing instructions according to the determination result; Transmitting the corresponding processing instruction to the corresponding component so that the component receiving the instruction re-determines its operating parameters so that the display brightness is qualified; When it is determined that the display brightness of the screen is qualified, the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected; The process of determining the highlight region of the face of the portrait according to the portrait features and counting the area of ​​the highlight region includes: intercepting a facial region of the portrait face in the portrait feature; determining the brightness of each sub-region in the facial region; Comparing each of the brightnesses with the light luminance to sequentially determine a brightness difference value corresponding to each of the sub-areas; Calculating the difference between each of the brightness difference values ​​and the preset brightness difference value in sequence, and recording the obtained difference value as the secondary brightness difference value; When a single secondary brightness difference value is greater than zero, the sub-region corresponding to the brightness difference value is recorded as a highlight region; Counting the areas of the highlight regions, and recording the sum of the obtained areas as the highlight region area; The process of determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region includes: Comparing the area of ​​the highlight region with the pre-stored preset area of ​​the highlight region; When the area of ​​the highlight region is smaller than the first preset area of ​​the highlight region, determining that the display brightness of the screen is qualified, completing the periodic acquisition of the image information of the area facing the screen, and continuously acquiring the image information of the area facing the screen; When the area of ​​the highlight region is greater than or equal to the first preset area of ​​the highlight region and smaller than the second preset area of ​​the highlight region, determining that the display brightness of the screen is unqualified, and determining whether the display brightness of the screen is qualified based on the highlight dispersion; When the area of ​​the highlight region is greater than or equal to the area of ​​the second preset highlight region, determining that the display brightness of the screen is unqualified, determining the actual distance between the portrait face and the screen according to the portrait feature, and correcting the display brightness of the screen based on the actual distance; The process of determining whether the display brightness of the screen is qualified based on the highlight dispersion includes: For each highlight region, the highlight region closest to the highlight region is recorded as an adjacent highlight region, and the distance between the highlight region and the adjacent highlight region is calculated. The obtained distance is recorded as the distribution distance for the highlight region. After the distribution distance of each highlight region is obtained, the average value of the distribution distances is calculated, and the obtained average value is recorded as the highlight dispersion. When the highlight dispersion is greater than a preset highlight dispersion, determining that the display brightness of the screen is qualified, and correcting the preset brightness difference value based on the highlight dispersion; When the highlight dispersion is less than or equal to the preset highlight dispersion and the highlight area is concentrated on one side of the facial area, determining that a light source exists on one side of the environment area where the screen is located, and dividing the environment area to determine whether the display brightness of the screen is qualified; When the highlight dispersion is less than or equal to the preset highlight dispersion and the highlight area is concentrated in the center of the facial area, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

2. The method for intelligently adjusting the screen of an educational tablet computer based on image processing according to claim 1, characterized in that: The process of correcting the preset brightness difference value based on the highlight dispersion includes: Calculating a difference between the highlight dispersion and the preset highlight dispersion, and recording the obtained difference as a dispersion difference; The preset brightness difference is increased based on the discreteness difference, and the increase amplitude of the preset brightness difference is proportional to the discreteness difference.

3. The method for intelligently adjusting the screen of an educational tablet computer based on image processing according to claim 1, characterized in that: The process of dividing the environment area into regions to determine whether the display brightness of the screen is qualified includes: dividing the environmental area into regions; Obtaining a facial center point, wherein the facial center point is the geometric center point of the contour of the facial region; Based on the facial center point, tangent lines are drawn outward along the two side edges of each highlight area, and the area enclosed by each tangent line and the edge of the environment area is recorded as the detection area; intercepting a portrait region in the portrait feature; removing the detection area and the portrait area from the environment area, and recording the area obtained after the removal as a comparison area; The average brightness of the detection area is recorded as the detection area average brightness, and the average brightness of the comparison area is recorded as the comparison area average brightness; Calculating the difference between the average brightness of the detection area and the average brightness of the comparison area, and recording the obtained difference as the regional brightness difference; When the area brightness difference is greater than the preset area brightness difference, the display brightness of the screen is determined to be qualified, and the periodic collection of the image information of the area facing the screen is completed, and the image information of the area facing the screen is continuously collected; When the regional brightness difference is less than or equal to the preset regional brightness difference, the display brightness of the screen is determined to be unqualified, the actual distance between the portrait face and the screen is determined according to the portrait features, and the display brightness of the screen is corrected based on the actual distance.

4. The method for intelligently adjusting the screen of an educational tablet computer based on image processing according to claim 1, characterized in that: The process of determining the actual distance between the face of the portrait and the screen according to the portrait features includes: determining an eye region of the face of the portrait according to the portrait features; Obtaining eye coordinates in the eye area; performing distortion correction on the eye coordinates; The distance between the eye coordinates and the screen is measured, and the obtained distance is recorded as the actual distance.

5. The method for intelligently adjusting the screen of an educational tablet computer based on image processing according to claim 4, characterized in that: The process of correcting the display brightness of the screen based on the actual distance includes: Comparing the actual distance with a pre-stored preset actual distance; The display brightness is reduced based on the actual distance, and the reduction degree of the display brightness is inversely proportional to the actual distance.

6. The method for intelligently adjusting the screen of an educational tablet computer based on image processing according to claim 5, characterized in that: After the display brightness is reduced, the process of adjusting the color temperature of the screen according to the interval in which the display brightness of the reduced screen is located includes: Determining the interval in which the display brightness of the screen after being reduced is located, and recording the determined interval as a brightness interval; The color temperature is reduced based on the brightness interval, and the reduction range of the color temperature is inversely proportional to the numerical range of the brightness interval.

7. The method for intelligently adjusting the screen of an educational tablet computer based on image processing according to claim 6, characterized in that: The process of re-determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region after the color temperature is lowered includes: re-determining whether the display brightness of the screen is qualified based on the area of ​​the highlight region; When the area of ​​the highlight area is larger than the area of ​​the second preset highlight area, it is determined that the processing of the image information does not meet the standards, resulting in a deviation in the measurement of the actual distance, historical image information is obtained, and the range interval of the eye coordinates is obtained based on each historical image information, the center point is obtained from each range interval, the obtained center point is used as the eye coordinate, and the actual distance between the eye coordinates and the screen is remeasured.

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