CN111240612A - Method and terminal for adjusting screen resolution - Google Patents
Method and terminal for adjusting screen resolution Download PDFInfo
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- CN111240612A CN111240612A CN201811432933.2A CN201811432933A CN111240612A CN 111240612 A CN111240612 A CN 111240612A CN 201811432933 A CN201811432933 A CN 201811432933A CN 111240612 A CN111240612 A CN 111240612A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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Abstract
The invention is suitable for the technical field of computers, and provides a method and a terminal for adjusting screen resolution, wherein the method comprises the following steps: by acquiring the position of human eyes; calculating a target viewing distance between the human eyes and a display screen of the terminal according to the positions of the human eyes; determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution; and adjusting the resolution of the display screen to the target resolution. According to the scheme, the target viewing distance from human eyes to the terminal display screen is calculated, and the resolution of the terminal display screen is adjusted in real time according to the target viewing distance, so that the eyes can be better protected, and the visual fatigue is relieved; by reducing the resolution of the display screen of the terminal, the power consumption of the mobile terminal is reduced, and the endurance time of the equipment is increased.
Description
Technical Field
The invention belongs to the technical field of computers, and particularly relates to a method and a terminal for adjusting screen resolution.
Background
With the rapid development of the times, the intelligent terminal device is a necessity in life, but the resolution of the screen of the intelligent terminal device has different difficulties for different people, and the old and people with glasses are sensitive to the resolution of the screen of the intelligent terminal device.
The crowd who is comparatively sensitive to the resolution ratio of intelligent terminal equipment screen is using intelligent terminal's in-process, in order to see clearly the content that intelligent terminal equipment's screen shows, people place intelligent terminal's display screen in the place that is close apart from eyes usually and use, and this kind of using-way can arouse visual fatigue and cause the damage to user's eyesight.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method and a terminal for adjusting a screen resolution, so as to solve the problem in the prior art that, for a crowd who is sensitive to the resolution of a screen of an intelligent terminal device, using the intelligent terminal device causes visual fatigue and damages to the vision.
A first aspect of an embodiment of the present invention provides a method for adjusting a screen resolution, including:
acquiring the position of human eyes;
calculating a target viewing distance between the human eyes and a display screen of the terminal according to the human eye positions;
determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution;
and adjusting the resolution of the display screen to the target resolution.
A second aspect of an embodiment of the present invention provides a terminal, including:
the acquisition unit is used for acquiring the positions of human eyes;
the computing unit is used for computing a target viewing distance between the human eyes and a display screen of the terminal according to the human eye positions;
the determining unit is used for determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution;
and the adjusting unit is used for adjusting the resolution of the display screen to the target resolution.
A third aspect of an embodiment of the present invention provides another terminal, including a processor, an input device, an output device, and a memory, where the processor, the input device, the output device, and the memory are connected to each other, where the memory is used to store a computer program that supports the terminal to execute the above method, where the computer program includes program instructions, and the processor is configured to call the program instructions and execute the following steps:
acquiring the position of human eyes;
calculating a target viewing distance between the human eyes and a display screen of the terminal according to the human eye positions;
determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution;
and adjusting the resolution of the display screen to the target resolution.
A fourth aspect of embodiments of the present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of:
acquiring the position of human eyes;
calculating a target viewing distance between the human eyes and a display screen of the terminal according to the human eye positions;
determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution;
and adjusting the resolution of the display screen to the target resolution.
The method for adjusting the screen resolution and the terminal equipment provided by the embodiment of the invention have the following beneficial effects:
according to the embodiment of the invention, the positions of human eyes are obtained; calculating a target viewing distance between human eyes and a display screen of the terminal according to the positions of the human eyes; determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution; and adjusting the resolution of the display screen to the target resolution. By calculating the viewing distance from human eyes to the terminal display screen and adjusting the resolution of the terminal display screen in real time according to the target viewing distance, the eyes can be better protected, and the visual fatigue is relieved; by reducing the resolution of the display screen of the terminal, the power consumption of the mobile terminal is reduced, and the endurance time of the equipment is increased.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flowchart illustrating an implementation of a method for adjusting a resolution of a screen according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an implementation of a method for adjusting a resolution of a screen according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating an implementation of S201 in a method for adjusting a screen resolution according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a rectangular feature of a Harr character according to an embodiment of the present invention;
fig. 5 is a flowchart illustrating an implementation of S202 in a method for adjusting a screen resolution according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating an implementation of a method for adjusting a resolution of a screen according to another embodiment of the present invention;
FIG. 7 is a diagram illustrating a screen resolution distribution according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a terminal according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a terminal according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a method for adjusting a screen resolution according to an embodiment of the present invention. The main execution body of the method for adjusting the screen resolution in this embodiment is a terminal, and the terminal includes but is not limited to a mobile terminal such as a smart phone, a tablet computer, and a PDA. The method of adjusting the screen resolution as shown in the figure may include:
s101: the position of the human eyes is obtained.
For example, when the terminal detects that the user uses the terminal, the front camera is started, whether the face of the user is in a static state or not is judged through the camera, and when the face of the user is in the static state, the face image of the terminal user is obtained. The method for acquiring the face image includes but is not limited to photographing, video shooting, real-time video recording and the like. Determining a face region through the acquired face image, further detecting human eye features in the face region by utilizing the Haar-Like features (determining the approximate positions of human eyes through the Haar-Like features), and finally positioning the specific positions of the human eyes through a neural network model.
S102: and calculating the target viewing distance between the human eyes and the display screen of the terminal according to the human eye positions.
The viewing distance is the distance between the human eyes and the display screen of the terminal.
The terminal transmits an infrared signal to human eye retina through the infrared distance meter based on the human eye position, obtains a reflected wave signal corresponding to the transmitted infrared signal, and converts the obtained reflected wave signal into an electric signal. And detecting the time difference between the emitted infrared signal and the received reflected wave signal, and calculating the target viewing distance according to the product of the time difference and the light propagation speed. The viewing distance formula is: where c denotes the propagation speed of light, t denotes a time difference, and L denotes a viewing distance.
In another embodiment, the terminal may obtain a Received Signal Strength Indication (RSSI) value of a reflected Signal of the transmitted infrared Signal, obtain a viewing distance matching the RSSI value of the reflected Signal according to a corresponding relationship between the RSSI value and the viewing distance, and obtain the viewing distance between the human eye and the display screen of the terminal.
S103: and determining the target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution.
The terminal obtains the resolution corresponding to the target viewing distance based on the preset corresponding relation between the viewing distance and the resolution, and obtains the target resolution corresponding to the target viewing distance.
The corresponding relation between the viewing distance and the resolution of the display screen can be a preset corresponding relation for a user, and when the user uses the same terminal, the resolution of the display screen is smaller when the viewing distance is longer, and the size of the content displayed on the display screen of the terminal is larger; the resolution of the display screen is larger as the viewing distance is closer, and the size of the display content of the display screen of the terminal is smaller.
Illustratively, when the size of the terminal display screen is 100cm (the size value refers to the length of the diagonal line of the terminal display screen), if the viewing distance is in the range of 0-60 (unit: cm), the value range is equally divided into 6 left-open and right-closed sections, which are sequentially (0, 10], (10, 20], (20, 30], (30, 40], (40, 50], (50, 60], (viewing distance value falling in the second section (10, 20), such as 15cm, corresponding to resolution of 4320 p; viewing distance value falling in the third section (20, 30), such as 25cm, corresponding to resolution of 2160 p; viewing distance value falling in the fifth section (40, 50), such as 45cm, corresponding to resolution of 1080 p; and so on, the value of resolution of the display screen corresponding to the viewing distance is obtained. The range of the viewing distance can be divided into a plurality of left-open right-close or left-close right-open intervals in other numbers in an average or non-average manner, and the number of the intervals and the length of the intervals can be selected and set according to actual needs.
S104: and adjusting the resolution of the display screen to the target resolution.
And the terminal obtains the resolution of the display screen of the terminal at the current viewing distance according to the corresponding relation between the viewing distance and the resolution of the display screen, and adjusts the resolution of the display screen to the resolution.
The terminal automatically adjusts the resolution at the background, and if the terminal detects that the watching distance of the user is 45cm, the resolution of the display screen is adjusted to 1080 p.
According to the scheme, the target viewing distance from human eyes to the terminal display screen is calculated, and the resolution of the terminal display screen is adjusted in real time according to the target viewing distance, so that the eyes can be better protected, and the visual fatigue is relieved; by reducing the resolution of the display screen of the terminal, the power consumption of the mobile terminal is reduced, and the endurance time of the equipment is increased.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for adjusting a screen resolution according to another embodiment of the present invention. The main execution body of the method for adjusting the screen resolution in this embodiment is a terminal, and the terminal includes but is not limited to a mobile terminal such as a smart phone, a tablet computer, and a PAD. The method of adjusting the screen resolution as shown in the figure may include:
s201: obtaining eye position
In this embodiment, S201 is identical to S101 in the previous embodiment, and please refer to the related description of S101 in the previous embodiment, which is not repeated herein.
Further, as shown in fig. 3, S201 may include S2011 to S2012, which are specifically as follows:
s2011: and acquiring a face image of the terminal user.
When the terminal detects that a user uses the terminal, a front-facing camera is started, whether the face of the user is in a static state or not is judged through the camera, and when the face of the user is in the static state, a face image of the terminal user is obtained. The method for acquiring the face image includes but is not limited to photographing, video shooting, real-time video recording and the like.
For example, when the terminal camera detects that the face of the user is located at the same position within a preset time period, it is determined that the face of the user is in a static state, and at this time, the face image of the terminal user is obtained. The time period is set by the user in advance according to actual conditions, and may be set to 3 seconds, 5 seconds, 6 seconds, and the like, for example, and is not limited herein.
S2012: processing the face image by using a preset neural network model to obtain the eye position of the face image; the neural network model is obtained by training a face sample set and a non-face sample set by using a machine learning algorithm, in the training process, the input of the neural network model is a face image, and the output of the neural network is the eye position of the face image.
The terminal determines a face area through the acquired face image, further detects human eye features in the face area by utilizing the Haar-Like features (the approximate positions of human eyes are determined through the Haar-Like features), and finally positions the human eyes through a neural network model.
Haar-like features (Haar-like features) are a type of digital image features used for object recognition. They are the first real-time face detection algorithm, so they are named for their close resemblance to Haar wavelet transform. Currently, the commonly used Haar-like features can be classified into three categories: linear features, edge features, point features (central features), diagonal features, are combined into a feature template. The characteristic template is provided with a white rectangle and a black rectangle, and the characteristic of the template is defined as the difference value of the sum of the white matrix pixel and the black matrix pixel.
As shown in fig. 4, the feature values of a (edge feature), b (edge feature), and d (linear feature) are calculated by the following formula: v ═ SumWhite colour (Bai)-SumBlack colourFor features such as c (linear features), the feature numerical calculation formula is: v ═ SumWhite colour (Bai)-2×SumBlack colourIn order to make the numbers of pixels in two kinds of rectangular regions in c (linear feature) uniform, the sum of black region pixels in c is multiplied by 2.
The Haar characteristic value reflects the gray level change condition of the image. For example: some features of the face can be described simply by rectangular features, such as: the eyes are darker than the cheeks, the sides of the bridge of the nose are darker than the bridge of the nose, the mouth is darker than the surroundings, etc.
In this embodiment, the integral image of the face image is calculated by using the human eye features of the face image acquired by the Haar feature extraction terminal, and the integral image of the face image is calculated and stored at one time, so as to provide a direct calculation result for the following pixel value calculation. Then, in the face image acquired by the terminal, the window a (edge feature), b (edge feature), d (diagonal feature) and c (linear feature) as shown in fig. 4 is used to slide the face image acquired by the terminal by a step length of 1, when the face image slides to a position, the sum of the pixel values corresponding to the white position in the area covered by the window is subtracted by the sum of the pixel values corresponding to the black position, a Haar-like feature value is calculated, and finally the whole image is traversed. After one traversal is finished, the window is proportionally enlarged in width or length, and the previous traversal steps are repeated until the window is enlarged to the last proportion. And comparing the Haar-like characteristic value obtained in the traversal process with the characteristic value of the initial weak classifier so as to judge whether human eye characteristics exist in the input human face image. If the Haar-like characteristic value is larger than the threshold value, the human eye characteristic is considered to exist; and if the Haar-like characteristic value is smaller than the threshold value, the human eye characteristic is considered to be absent.
When the terminal judges that the human eye features exist in the human face image (namely the terminal considers that human eye organs exist in the human face image), the neural network model is used for determining the human eye position corresponding to the human face image.
The preset neural network model is obtained by training a face sample set and a non-face sample set by using a machine learning algorithm, wherein the face sample set can be various different types of face pictures including but not limited to a male face picture, a female face picture, a big face picture, a child face picture, a complete face picture, an upper half face picture, a lower half face picture and the like; the set of non-face samples can be a variety of different types of non-face pictures including, but not limited to, cat face pictures, dog face pictures, plant pictures, food pictures, and the like. The more pictures and the more complete the types contained in the face sample set and the non-face sample set, the more accurate the obtained training result.
The preset neural network model may include an input layer, a hidden layer, and an output layer (loss function layer). The input layer includes an input layer node for receiving an input face image from the outside. The hidden layer is used for processing the face image and extracting the local features of the face image, and the local features are the eye features. The output layer is used for outputting the human eye position corresponding to the human face image.
In the training process, the input of the neural network model is a face image acquired by a terminal, and the gray value processing of the face image is carried out by defining a convolution network (a filter slides (convolves) on a picture to generate feature mapping), so as to acquire the features of human eyes. Obtaining human eye position in human face image by utilizing softmax (normalization)The probability of a position is converted to a number between 0 and 1, defining a cross entropy loss function:
wherein y represents prediction output (namely the probability of acquiring the positions of human eyes in a human face image), L represents a cross entropy loss function value, and the loss function L is smaller when the prediction output is closer to a real sample label 1; the loss function L is larger as the prediction output is closer to the true sample label 0. After the processing, the output layer of the neural network model outputs the specific human eye position corresponding to the human face image.
The number of the face sample set and the number of the non-face sample set samples can be set according to actual conditions, the number of the samples trained to a certain extent is more, and the more accurate the result is when the neural network model obtained by training is used for identification.
S202: and calculating the target viewing distance between the human eyes and the display screen of the terminal according to the human eye positions.
In this embodiment, S202 is identical to S102 in the previous embodiment, and please refer to the related description of S102 in the previous embodiment, which is not repeated herein.
Further, as shown in fig. 5, in order to calculate the target viewing distance between the human eye and the terminal display more accurately and more quickly, S202 may include S2021 to S2023, specifically as follows:
s2021: and emitting an infrared signal according to the position of the human eyes.
The terminal transmits infrared signals to the retina of the human eye through the infrared distance meter based on the position of the human eye.
S2022: and receiving a reflected signal of the infrared signal, and acquiring a Received Signal Strength Indication (RSSI) value of the reflected signal.
The terminal transmits infrared signals to the retina of the human eye through the infrared distance meter based on the position of the human eye, and the infrared signals are reflected when encountering barriers, so that the terminal acquires reflection signals corresponding to the infrared signals transmitted to the retina of the human eye and acquires the RSSI value of the reflection signals.
S2023: and determining the target viewing distance between human eyes and a display screen of the terminal according to the preset corresponding relation between the RSSI value and the distance and the RSSI value of the reflected signal.
And the terminal acquires the viewing distance matched with the RSSI value of the reflected signal according to the corresponding relation between the RSSI value and the viewing distance to obtain the viewing distance between human eyes and a display screen of the terminal.
The corresponding relation between the RSSI value and the viewing distance is preset and stored in the terminal, the greater the RSSI value is, the closer the viewing distance is, and the smaller the RSSI value is, the farther the viewing distance is.
For example, if the RSSI is in the range of-100 to 0, the unit of the RSSI is: decibel milliwatts (dbm), the value range is averagely divided into 5 left-open and right-closed intervals, the RSSI value falling in the first interval (-100, -80), (-80, -60), (-60, -40), (-40, -20), (-20, 0] in sequence, such as-90 dbm, the viewing distance from the corresponding human eye to the display screen of the terminal is 30cm, the RSSI value falling in the second interval (-80, -60), such as-75 dbm, the viewing distance from the corresponding human eye to the display screen of the terminal is 15cm, the RSSI value falling in the third interval (-60, -40), such as-50 dbm, the viewing distance from the corresponding human eye to the display screen of the terminal is 5cm, and so on, the viewing distance from the human eye to the display screen of the terminal corresponding to the RSSI value is obtained, which is worth explaining, here, the example is merely an exemplary illustration, and other manners may also be adopted, the range of the RSSI may also be divided into some other number of left-open right-closed or left-closed right-open intervals, or the number of the intervals and the length of the intervals may be selectively set according to actual needs.
The RSSI value may also be a one-to-one correspondence with the viewing distance. Illustratively, if the RSSI value ranges from-60 to 0, the RSSI value is in dbm, and the corresponding viewing distance ranges from 60 to 0, the viewing distance values are in units of: centimeters (cm). When the RSSI value of the reflected signal acquired by the terminal is-50 dbm, the corresponding viewing distance is 50 cm; when the RSSI value of the reflected signal acquired by the terminal is-30 dbm, the corresponding viewing distance is 30 cm; when the RSSI value of the reflected signal acquired by the terminal is-15 dbm, the corresponding viewing distance is 15 cm; and by analogy, the watching distance corresponding to the RSSI value is obtained.
S203: and determining the target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution.
S203 in this embodiment is identical to S103 in the previous embodiment, and please refer to the related description of S103 in the previous embodiment, which is not repeated herein.
Further, in order to avoid the misoperation of adjusting the resolution of the display screen and reducing the frequently adjusted resolution, S203 may be: when the absolute value of the difference value between a first target viewing distance calculated at a first moment and a second target viewing distance calculated at a second moment is larger than a preset threshold value, determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution; wherein the first time is adjacent to the second time, and the first time is before the second time.
The terminal calculates to obtain a first target viewing distance value at a first moment, calculates to obtain a second target viewing distance value at a second moment, and judges whether the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is larger than a preset threshold value.
If the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is larger than a preset threshold value, judging that the resolution of the display screen needs to be adjusted; and determining the resolution corresponding to the second target viewing distance value according to the preset corresponding relation between the viewing distance and the resolution of the display screen, and adjusting the resolution of the display screen to the resolution corresponding to the second target viewing distance value.
And if the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is smaller than or equal to a preset threshold value, not adjusting the resolution of the display screen, and keeping the resolution corresponding to the first target viewing distance value.
It should be noted that during the calculation of the first target viewing distance value and the second target viewing distance value, the resolution of the display screen remains unchanged, and the resolution corresponding to the first target viewing distance value is maintained.
The preset threshold is a value defined by a user, and the user may define the threshold according to the user's needs, for example, the threshold may be 5 or 8, and this is not limited here. The first time and the second time are two adjacent times, and the first time is before the second time.
Illustratively, the terminal calculates that the viewing distance value of the user at the first moment is 15cm, the viewing distance value of the user at the second moment is 25cm, at this time, the viewing distance value of the user at the second moment is subtracted from the viewing distance value of the user at the first moment by 15cm, the absolute value of the difference between the two is 10, the absolute value 10 of the difference is greater than a preset threshold value 5, the resolution of the display screen needs to be adjusted, the resolution of the display screen is determined according to the viewing distance value, and the resolution of the display screen is adjusted to 2160p of the display screen corresponding to the viewing distance value of the user at the second moment by the terminal. During the calculation of the viewing distance value at the first time and the viewing distance value at the second time, the resolution of the display screen does not need to be adjusted, and the viewing distance value at the first time is kept at a resolution 4320p corresponding to 15 cm.
Or the terminal calculates that the viewing distance value of the user at the first moment is 25cm, the viewing distance value of the user at the second moment is 15cm, at this time, the viewing distance value of the user at the second moment is subtracted by the viewing distance value of the user at the first moment by 25cm, the absolute value of the difference between the viewing distance value and the viewing distance value is 10, the absolute value of the difference 10 is larger than the preset threshold 5, the resolution of the display screen needs to be adjusted is judged, the resolution of the display screen is determined according to the viewing distance value, and the resolution of the display screen is adjusted to be 2160p of the display screen corresponding to the viewing distance value of the user at the second moment. During the calculation of the viewing distance value at the first time and the viewing distance value at the second time, the resolution of the display screen does not need to be adjusted, and the viewing distance value at the first time is kept at a resolution 4320p corresponding to 15 cm.
Optionally, the terminal calculates a first target viewing distance value at a first time, calculates a second target viewing distance value at a second time, and determines whether an absolute value of a difference between the first target viewing distance value and the second target viewing distance value is greater than a preset threshold within a preset time.
And if the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is greater than a preset threshold value within a preset time, determining the resolution corresponding to the second target viewing distance value at the second moment according to the preset corresponding relation between the viewing distance and the resolution of the display screen, and adjusting the resolution of the display screen to the resolution corresponding to the second target viewing distance value.
If the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is not greater than the preset threshold value within the preset time, the resolution of the display screen does not need to be adjusted, and the resolution corresponding to the first target viewing distance value is maintained.
It should be noted that during the calculation of the first target viewing distance value and the second target viewing distance value, the resolution of the display screen remains unchanged, and the resolution corresponding to the first target viewing distance value is maintained.
The preset time is a value defined by a user, and the user can define the time length according to the requirement of the user, for example, the preset time can be set to be 20 seconds, 15 seconds and the like.
Illustratively, the terminal calculates that the viewing distance value of the user at the first moment is 15cm, the viewing distance value of the user at the second moment is 25cm, at this time, the viewing distance value of the user at the second moment is subtracted by the viewing distance value of the user at the first moment by 15cm, the absolute value of the difference between the viewing distance value and the viewing distance value is 10, the absolute value of the difference 10 is greater than a preset threshold 5, and the absolute value of the difference 10 is greater than the preset threshold 5 within 15 seconds, then it is determined that the resolution of the display screen needs to be adjusted, the resolution of the display screen is determined according to the viewing distance value, and the resolution of the display screen is adjusted to the resolution 2160p of the display screen corresponding to the viewing distance value of the user at the second moment. During the calculation of the viewing distance value at the first time and the viewing distance value at the second time, the resolution of the display screen does not need to be adjusted, and the viewing distance value at the first time is kept at a resolution 4320p corresponding to 15 cm.
S204: and adjusting the resolution of the display screen to the target resolution.
The present embodiment S204 is identical to S104 in the previous embodiment, and please refer to the related description of S104 in the previous embodiment, which is not repeated herein.
S205: and if the terminal is detected to be in a screen locking state or the face image is not detected, adjusting the resolution of the display screen to be the preset lowest resolution.
When the terminal device is in a screen locking state, such as a standby state, a screen turning state, a power-off state and the like of the mobile phone, or the terminal does not detect a face image, for example, the face of a terminal user is far away from the terminal device and exceeds a terminal detection range, the face of the user only stays on a display screen of the terminal device for a short time and does not stay for a period of time, and the like, the terminal automatically adjusts the resolution of the display screen to be the preset minimum resolution. The preset minimum resolution is a value defined by a user, and the user can set the minimum resolution of the display screen according to the user's needs, such as 720p, which is not limited here.
According to the scheme, the target viewing distance from human eyes to the terminal display screen is calculated, and the resolution of the terminal display screen is adjusted in real time according to the target viewing distance, so that the eyes can be better protected, and the visual fatigue is relieved; by reducing the resolution of the display screen of the terminal, the power consumption of the mobile terminal is reduced, and the endurance time of the equipment is increased.
Referring to fig. 6, fig. 6 is a schematic flow chart of a method for adjusting a screen resolution according to another embodiment of the present invention. The main execution body of the method for adjusting the screen resolution in this embodiment is a terminal, and the terminal includes but is not limited to a mobile terminal such as a smart phone, a tablet computer, and a PAD.
The difference between the present embodiment and the embodiment corresponding to fig. 2 is S303 to S304, where S301 to S302 in the present embodiment are completely the same as S201 to S202 in the previous embodiment, and reference is specifically made to the related description of S201 to S202 in the previous embodiment, which is not repeated herein. S303 to S304 are specifically as follows:
s303: and acquiring target size information of the display screen.
The terminal acquires the size information of a display screen of the terminal currently used by a user. The size information of the display screen may be the size information of the display screen carried by the terminal device when the terminal device leaves the factory, or the size information of the display screen in a one-hand operation mode that is convenient for a user to adjust.
S304: and determining target resolution ratios matched with the target size information and the target viewing distance according to preset corresponding relations among the size information, the target viewing distance and the resolution ratios of the display screen.
The terminal acquires the size information of the terminal display screen currently used by a user, and determines the resolution of the terminal display screen matched with the size and the viewing distance of the terminal display screen according to the preset corresponding relation among the size information, the viewing distance and the resolution of the terminal display screen.
The preset corresponding relation among the size information, the viewing distance and the resolution of the terminal display screen can be specifically a preset corresponding relation for a user, and the resolution of the terminal display screen is determined by the size information and the viewing distance of the terminal display screen at the same time.
As shown in fig. 7, the abscissa is size information of the terminal display screen, and the ordinate is a viewing distance value. When the viewing distance value is 20cm and the size of the terminal display screen is 30cm, the resolution of the terminal display screen is 1080 p; when the viewing distance value is 20cm and the size of the terminal display screen is 70cm, the resolution of the terminal display screen is 2160 p; when the viewing distance value is 30cm and the size of the terminal display screen is 30cm, the resolution of the terminal display screen is 720 p; when the viewing distance value is 40cm and the size of the terminal display screen is 70cm, the resolution of the terminal display screen is 1080 p. If the values of the horizontal and vertical coordinates just fall on the border of the different zones shown in fig. 7, the resolution of the terminal display screen is based on the resolution shown below the border. For example, when the viewing distance value is 30cm and the size of the terminal display is 70cm, the resolution of the terminal display is just on the boundary of 1080p and 2160p, and 2160p is taken as the resolution of the terminal display.
Further, S304 specifically is: when the absolute value of the difference value between the first target viewing distance calculated at the first moment and the second target viewing distance calculated at the second moment is larger than a preset threshold value, determining target resolution ratios matched with the target size information and the target viewing distance according to a preset corresponding relation among size information of a display screen, the target viewing distance and the resolution ratio.
The terminal calculates a first target viewing distance value at a first moment, calculates a second target viewing distance value at a second moment, judges whether the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is larger than a preset threshold value, determines the resolution corresponding to the second target viewing distance value according to the size information of the display screen and the target viewing distance if the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is larger than the preset threshold value, and adjusts the resolution of the display screen to the resolution corresponding to the second target viewing distance value; and if the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is smaller than or equal to a preset threshold value, the resolution of the display screen is not adjusted, and the resolution corresponding to the first target viewing distance value is kept.
It should be noted that during the calculation of the first target viewing distance value and the second target viewing distance value, the resolution of the display screen remains unchanged, and the resolution corresponding to the first target viewing distance value is maintained.
The preset threshold is a value defined by a user, and the user may define the threshold according to the user's needs, for example, the threshold may be 5 or 8, and this is not limited here. The first time and the second time are two adjacent times, and the first time is before the second time.
Illustratively, the terminal calculates that the viewing distance value of the user at the first moment is 15cm, the viewing distance value of the user at the second moment is 25cm, at this time, the viewing distance value of the user at the second moment is subtracted from the viewing distance value of the user at the first moment by 15cm, the absolute value of the difference between the two values is 10, the absolute value of the difference 10 is greater than a preset threshold 5, and it is determined that the resolution of the display screen needs to be adjusted. And determining the value of the resolution of the display screen according to the size information of the display screen and the target viewing distance, for example, when the viewing distance value is 25cm and the size of the display screen is 40cm, the resolution of the corresponding display screen should be adjusted to 1080 p.
During the calculation of the viewing distance value at the first instant and the viewing distance value at the second instant, the resolution of the display screen remains unchanged.
Optionally, the terminal calculates a first target viewing distance value at a first time, calculates a second target viewing distance value at a second time, and determines whether an absolute value of a difference between the first target viewing distance value and the second target viewing distance value is greater than a preset threshold within a preset time.
If the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is greater than a preset threshold value within preset time, judging that the resolution of the display screen needs to be adjusted; and determining the resolution corresponding to the second target viewing distance value according to the size information and the target viewing distance of the display screen, and adjusting the resolution of the display screen to the resolution corresponding to the second target viewing distance value.
And if the absolute value of the difference value between the first target viewing distance value and the second target viewing distance value is not greater than the preset threshold value within the preset time, judging that the resolution of the display screen does not need to be adjusted, and keeping the resolution corresponding to the first target viewing distance value.
It should be noted that during the calculation of the first target viewing distance value and the second target viewing distance value, the resolution of the display screen remains unchanged, and the resolution corresponding to the first target viewing distance value is maintained.
The preset time is a value defined by a user, and the user can define the time length according to the requirement of the user, for example, the preset time can be set to be 20 seconds, 15 seconds and the like.
Illustratively, the terminal calculates that the viewing distance value of the user at the first time is 15cm, the viewing distance value of the user at the second time is 25cm, at this time, the viewing distance value of the user at the second time is subtracted from the viewing distance value of the user at the first time by 15cm, so that the absolute value of the difference between the two is 10, the absolute value of the difference 10 is greater than the preset threshold 5, and the absolute value of the difference 10 is greater than the preset threshold 5 within 15 seconds, so that the resolution of the display screen needs to be adjusted. And determining the value of the resolution of the display screen according to the size information of the display screen and the target viewing distance, for example, when the viewing distance value is 25cm and the size of the display screen is 40cm, the resolution of the corresponding display screen should be adjusted to 1080 p.
During the calculation of the viewing distance value at the first instant and the viewing distance value at the second instant, the resolution of the display screen remains unchanged.
According to the scheme, the target viewing distance from human eyes to the terminal display screen is calculated, and the resolution of the terminal display screen is adjusted in real time according to the target viewing distance, so that the eyes can be better protected, and the visual fatigue is relieved; by reducing the resolution of the display screen of the terminal, the power consumption of the mobile terminal is reduced, and the endurance time of the equipment is increased.
Referring to fig. 8, fig. 8 is a schematic diagram of a terminal according to an embodiment of the present invention. The terminal includes units for executing steps in the embodiments corresponding to fig. 1, fig. 2, fig. 3, fig. 5, and fig. 6. Please refer to fig. 1 and 2, fig. 3, fig. 5, and fig. 6 for the corresponding embodiments. For convenience of explanation, only the portions related to the present embodiment are shown. Referring to fig. 8, the terminal 4 includes:
a human eye position obtaining unit 410 for obtaining a human eye position;
a calculating unit 420, configured to calculate a target viewing distance between the human eye and a display screen of the terminal according to the human eye position;
a first determining unit 430, configured to determine a target resolution corresponding to the target viewing distance based on a preset correspondence between the viewing distance and the resolution;
a first adjusting unit 440, configured to adjust the resolution of the display screen to the target resolution.
Further, the obtaining unit 410 includes:
the face image acquisition unit is used for acquiring a face image of a terminal user;
the human eye position acquisition unit is used for processing the human face image by using a preset neural network model to obtain the human eye position of the human face image; the neural network model is obtained by training a face sample set and a non-face sample set by using a machine learning algorithm, in the training process, the input of the neural network model is a face image, and the output of the neural network is the eye position of the face image.
Further, the calculating unit 420 is specifically configured to:
emitting an infrared signal according to the position of the human eyes;
receiving a reflected signal of the infrared signal, and acquiring a Received Signal Strength Indication (RSSI) value of the reflected signal;
and determining the target viewing distance between the human eyes and the display screen of the terminal according to the preset corresponding relation between the RSSI value and the viewing distance and the RSSI value of the reflected signal.
Further, the first determining unit 430 is specifically configured to: when the absolute value of the difference value between a first target viewing distance calculated at a first moment and a second target viewing distance calculated at a second moment is larger than a preset threshold value, determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the distances and the resolutions; wherein the first time is adjacent to the second time, and the first time is before the second time.
Further, the terminal further includes:
a size information acquisition unit for acquiring target size information of the display screen;
and the second determining unit is used for determining the target resolution ratio matched with the target size information and the target viewing distance according to the preset corresponding relation among the size information, the target viewing distance and the resolution ratio of the display screen.
Further, the terminal may further include:
and the second adjusting unit is used for adjusting the resolution of the display screen to be the preset lowest resolution if the terminal is detected to be in a screen locking state or no face image is detected.
Referring to fig. 9, fig. 9 is a schematic diagram of a terminal according to another embodiment of the present invention. As shown in fig. 9, the terminal 5 of this embodiment includes: a processor 50, a memory 51 and a computer program 52 stored in said memory 51 and executable on said processor 50. The processor 50 executes the computer program 52 to implement the steps in the above-described method embodiment of adjusting the screen resolution of each terminal, for example, S101 to S104 shown in fig. 1. Alternatively, the processor 50, when executing the computer program 52, implements the functions of the units in the device embodiments, such as the functions of the units 410 to 440 shown in fig. 8.
Illustratively, the computer program 52 may be divided into one or more units, which are stored in the memory 51 and executed by the processor 50 to accomplish the present invention. The one or more units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 52 in the terminal 5. For example, the computer program 52 may be divided into an acquisition unit, a calculation unit, a determination unit, and an adjustment unit, each unit functioning specifically as described above.
The terminal may include, but is not limited to, a processor 50, a memory 51. It will be appreciated by those skilled in the art that fig. 9 is only an example of a terminal 5 and does not constitute a limitation of the terminal 5 and may include more or less components than those shown, or some components in combination, or different components, for example the terminal may also include input output terminals, network access terminals, buses, etc.
The Processor 50 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 51 may be an internal storage unit of the terminal 5, such as a hard disk or a memory of the terminal 5. The memory 51 may also be an external storage terminal of the terminal 5, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like provided on the terminal 5. Further, the memory 51 may also include both an internal storage unit of the terminal 5 and an external storage terminal. The memory 51 is used for storing the computer program and other programs and data required by the terminal. The memory 51 may also be used to temporarily store data that has been output or is to be output.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method of adjusting screen resolution, comprising:
acquiring the position of human eyes;
calculating a target viewing distance between the human eyes and a display screen of the terminal according to the human eye positions;
determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution;
and adjusting the resolution of the display screen to the target resolution.
2. The method of claim 1, wherein said obtaining eye positions comprises:
acquiring a face image of a terminal user;
processing the face image by using a preset neural network model to obtain the eye position of the face image; the neural network model is obtained by training a face sample set and a non-face sample set by using a machine learning algorithm, in the training process, the input of the neural network model is a face image, and the output of the neural network is the eye position of the face image.
3. The method of claim 1, wherein determining the target resolution corresponding to the target viewing distance based on a preset correspondence between viewing distance and resolution comprises:
when the absolute value of the difference value between a first target viewing distance calculated at a first moment and a second target viewing distance calculated at a second moment is larger than a preset threshold value, determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the distances and the resolutions; wherein the first time is adjacent to the second time, and the first time is before the second time.
4. The method of claim 1, wherein calculating the target viewing distance between the human eye and the display screen of the terminal according to the human eye position comprises:
emitting an infrared signal according to the position of the human eyes;
receiving a reflected signal of the infrared signal, and acquiring a Received Signal Strength Indication (RSSI) value of the reflected signal;
and determining the target viewing distance between the human eyes and the display screen of the terminal according to the preset corresponding relation between the RSSI value and the viewing distance and the RSSI value of the reflected signal.
5. The method of any of claims 1 to 4, wherein prior to adjusting the resolution of the display screen to the target resolution, further comprising:
acquiring target size information of the display screen;
the step of determining the target resolution corresponding to the target viewing distance based on the preset corresponding relationship between the viewing distance and the resolution includes:
and determining target resolution ratios matched with the target size information and the target viewing distance according to preset corresponding relations among the size information, the target viewing distance and the resolution ratios of the display screen.
6. The method of claim 1, further comprising:
and if the terminal is detected to be in a screen locking state or the face image is not detected, adjusting the resolution of the display screen to be the preset lowest resolution.
7. A terminal, comprising:
the acquisition unit is used for acquiring the positions of human eyes;
the computing unit is used for computing a target viewing distance between the human eyes and a display screen of the terminal according to the human eye positions;
the determining unit is used for determining a target resolution corresponding to the target viewing distance based on a preset corresponding relation between the viewing distance and the resolution;
and the adjusting unit is used for adjusting the resolution of the display screen to the target resolution.
8. The terminal of claim 7, wherein said obtaining eye positions comprises:
the face image acquisition unit is used for acquiring a face image of a terminal user;
the human eye position acquisition unit is used for processing the human face image by using a preset neural network model to obtain the human eye position of the human face image; the neural network model is obtained by training a face sample set and a non-face sample set by using a machine learning algorithm, in the training process, the input of the neural network model is a face image, and the output of the neural network is the eye position of the face image.
9. A terminal comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6.
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| CN201811432933.2A CN111240612A (en) | 2018-11-28 | 2018-11-28 | Method and terminal for adjusting screen resolution |
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| CN201811432933.2A CN111240612A (en) | 2018-11-28 | 2018-11-28 | Method and terminal for adjusting screen resolution |
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