CN115204107A - Evaluation method and evaluation device for word size grading of vehicle-mounted information system - Google Patents

Abstract

The invention discloses an evaluation method and a device for grading the font size of a vehicle-mounted information system, wherein the evaluation method comprises the following steps: displaying a vocabulary forced selection interface under different test conditions, wherein the display content in the interface comprises meaningful real words or meaningless fake words with different font display conditions; receiving result data of the word true and false judgment of a user, and controlling the display content in the interface to dynamically change according to the data result; obtaining presentation time thresholds of the display contents under different test conditions from the data result; and comparing the presentation time threshold with the normal mode index to obtain a character readability grade result, wherein the character readability grade result comprises a clear character size, a minimum character size, a cautious character size and an unrecommended character size.

Description

Evaluation method and evaluation device for grading character sizes of vehicle-mounted information system

Technical Field

The invention relates to the technical field of computers, in particular to an evaluation method and an evaluation device for grading the font size of a vehicle-mounted information system.

Background

With the development of the intelligent cabin, a machine with multiple screens and a long-distance screen are gradually used by more and more vehicle enterprises, and the diversified screens and the display technology are improved, so that more and more abundant information is borne in the vehicle-mounted information systems of the vehicle enterprises. The characters in the vehicle-mounted information system are designed in a variety of ways, and in some designs, because the characters are small in size, improper in color matching, far in character display position and the like, the characters in the vehicle-mounted display screen cannot be seen clearly during driving, so that hidden dangers are brought to driving safety, and driving experience is influenced.

Disclosure of Invention

In order to solve the technical problems, the invention provides an evaluation method and an evaluation device for grading the font size of a vehicle-mounted information system.

In a first aspect of the embodiments of the present invention, a method for evaluating a font size classification of a vehicle-mounted information system is provided, including:

displaying a vocabulary forced selection interface under different test conditions, wherein the display content in the interface comprises meaningful real words or meaningless fake words with different font display conditions;

receiving result data of the word true and false judgment of a user, and controlling the display content in the interface to dynamically change according to the data result;

acquiring presentation time thresholds of the display contents under different test conditions from the data result;

comparing the presentation time threshold with the normal mode index to obtain a character readability grade result, wherein the character readability grade result comprises a clear character size, a minimum character size, a cautious character size and an unrecommended character size;

the normal mode index comprises a corresponding relation between a presentation time threshold and a character legibility grade.

Optionally, the interface for displaying the vocabulary forced selection under different test conditions includes:

displaying a watching frame for prompting a character display position in a first display area, displaying a forced word selection vocabulary in a second display area, displaying a presentation interface for masking stimulation in a third display area for eliminating a visual afterimage phenomenon, and displaying a judgment interface in a fourth display area for prompting a user to select a real word or a fake word; and the first display area, the second display area, the third display area and the fourth display area are sequentially and circularly displayed.

Optionally, controlling the display content in the interface to dynamically change according to the data result, including:

and reducing the presentation time threshold of the display content according to the correct times of the user for performing true and false judgment on the vocabulary, and increasing the presentation time threshold of the display content according to the wrong times of the user for performing true and false judgment on the vocabulary, wherein the vocabulary is a two-word.

Optionally, the result data of the receiving user performing true and false judgment on the vocabulary includes a vocabulary judgment accuracy and a vocabulary presentation time.

Optionally, comparing the corresponding relationship between the presentation time threshold and the size of the font size with a normal mode index to obtain a result of the text readability level, including:

and comparing the presentation time threshold values corresponding to the word sizes in different test conditions with the threshold limit values in the normal mode indexes, and outputting the word readability grade result according to the comparison result.

Optionally, the method for constructing the norm indicator includes:

displaying a vocabulary forcible selection interface under a plurality of conditions, wherein the displayed content comprises meaningful real words or meaningless fake words;

receiving result data of the user for judging whether the vocabulary is true or false, and controlling the display content in the interface to dynamically change according to the data result;

obtaining the presentation time threshold and the subjective comfort level score of the display content under different test conditions from the data result;

calculating a presentation time threshold and a subjective comfort level score of the display content under various conditions;

selecting the word size with the subjective comfort degree score higher than a preset score as a reference, and obtaining the word size with difference on a presentation time threshold value through repeated measurement variance analysis;

and taking the intersection of the character size higher than the preset score and the character size with difference on the presentation time threshold value as the minimum character size, and constructing a normal mode table based on the minimum character size so as to distinguish the presentation time threshold value interval of the character readability grade result.

In a second aspect of the embodiments of the present invention, there is provided an evaluation apparatus for grading a font size of a vehicle-mounted information system, including:

the test module is used for displaying an interface for forced selection of the vocabulary under different test conditions, and the display content in the interface comprises meaningful real words or meaningless false words with different font display conditions;

the display control module is used for receiving result data of the real and false judgment of the vocabulary by the user and controlling the display content in the interface to dynamically change according to the data result;

the processing module is used for acquiring the presentation time threshold of the display content under different test conditions from the data result;

the evaluation module is used for comparing the presentation time threshold with the normal mode indexes to obtain a character readability grade result, wherein the character readability grade result comprises a clear character size, a minimum character size, a cautious character size and an unrecommended character size; wherein the normal index comprises a corresponding relation between a presentation time threshold and a character legibility grade.

Optionally, the testing module includes a display module, where the display module is configured to display a watching frame for prompting a text presentation position in a first display area, display a forced word selection vocabulary in a second display area, display a presentation interface for masking a stimulus in a third display area, and eliminate a visual afterimage phenomenon, and display a determination interface in a fourth display area, and is configured to prompt a user to select a real word or a fake word; and the first display area, the second display area, the third display area and the fourth display area are sequentially and circularly displayed.

Optionally, the display control module includes a control unit, and the control unit is configured to reduce presentation time of the display content according to a correct number of times that the user performs a true/false determination on the vocabulary, and increase presentation time of the display content according to an incorrect number of times that the user performs a true/false determination on the vocabulary, where the vocabulary is a two-word.

Optionally, the evaluation module includes an evaluation subunit, and the evaluation subunit is configured to compare the presentation time thresholds corresponding to the font sizes in different test conditions with a threshold limit value in the normal mode index, and output the text readability level result according to a comparison result.

Optionally, the evaluation apparatus further includes a normative index constructing module, configured to perform the following:

displaying a vocabulary forcible selection interface under a plurality of conditions, wherein the displayed content comprises meaningful real words or meaningless fake words;

receiving result data of the word true and false judgment of a user, and controlling the display content in the interface to dynamically change according to the data result;

acquiring a presentation time threshold and a subjective comfort level score of the display content under different test conditions from the data result;

calculating a presentation time threshold and a subjective comfort level score of the display content under various conditions;

selecting the word size with the subjective comfort degree score higher than a preset score as a reference, and obtaining the word size with difference on a presentation time threshold value through repeated measurement variance analysis;

and taking the intersection of the word size higher than the preset score and the word size different from the presentation time threshold value as the minimum word size, and constructing a normal mode table based on the minimum word size so as to distinguish the presentation time threshold value interval of the word readability grade result.

In a third aspect of the embodiments of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a computer, performs the method according to the first aspect of the embodiments of the present invention.

According to the technical scheme provided by the invention, a test interface is provided for testing, result data for evaluation is obtained, the result data is calculated and analyzed to obtain the corresponding relation between the presentation time threshold and the word size under different test conditions, then the presentation time threshold is used for comparing with the normal mode index to obtain the word legibility grade result, and the word size suitable for driving can be effectively defined under different test conditions.

Drawings

Fig. 1 is a schematic flow chart of an evaluation method for word size grading of a vehicle-mounted information system in an embodiment of the present invention;

FIG. 2 is a diagram illustrating four display areas of an interface displaying forced vocabulary selection according to an embodiment of the present invention;

FIG. 3 is a diagram illustrating the relationship between word presentation time and word size according to an embodiment of the present invention;

FIG. 4 is a schematic flow chart diagram of a method for constructing a normative index according to an embodiment of the present disclosure;

FIG. 5 is a diagram illustrating a normal mode indicator table according to an embodiment of the present invention;

FIG. 6 is a diagram illustrating presentation times of font size and color tests according to an embodiment of the present invention;

fig. 7 is a block diagram of an evaluation apparatus for grading the font sizes of a vehicle-mounted information system according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

Referring to fig. 1, a word size grading evaluation method for a vehicle-mounted information system includes collecting objective indexes and subjective indexes of word readability, cleaning, processing and analyzing data of the indexes, and comparing the indexes with normal indexes to evaluate whether the word size is suitable for the vehicle-mounted information system.

The evaluation method comprises the following steps:

step 110: and displaying a vocabulary forced selection interface under different test conditions, wherein the display content comprises meaningful real words or nonsensical fake words.

Different test conditions comprise test environment conditions and font setting conditions under the test environment; such as ambient light level, steady and unsteady environments, observation distance, etc.; the real words and the fake words have different font display conditions, font types, character weights, character intervals, font colors, font color combinations, font color-background contrast and polarity. In other testing environments, the testing equipment may also include cathode ray tubes, liquid crystal displays, OLED displays, and the like.

For example, the different location conditions include: 500mm, 700mm, 800mm, 900mm; under different brightness conditions, the contrast ratios are 2, 3, 4, 5, 6 and 7; the different word spacings are 0.9, 1.0, 1.1.

The present invention provides a display interface for a user to select a word, whether the word selected by the user for display is true at a specified display time. As shown in fig. 2, the vocabulary forced selection interface includes a first display area, a second display area, a third display area, and a fourth display area, and the four display areas may be located in the same location area of the display interface of the display.

Firstly, a watching frame for prompting a character presenting position is displayed in a first display area. The attention frame presents a rectangular box on the interface, the background color of the interface is pure white, and the presentation time is 1000ms (milliseconds). As the eyes of the user can generate natural eye jump when the user browses the screen, the gaze frame is arranged to enable the sight of the user to be concentrated near the gaze frame through other information of the eye jump gaze environment, and the interference of other information sources is reduced. And then, displaying a forced selection vocabulary in a second display area, wherein the forced selection vocabulary is two words, the two words are displayed in the range framed by the gaze frame, and the display time is changed along with the accuracy of the user answer. And then displaying a presentation interface of the masking stimulus in a third display area, wherein the presentation interface is used for eliminating a visual afterimage phenomenon (the visual afterimage phenomenon is a phenomenon that a certain stimulus is seen continuously and still impressions in the mind within a short time after the stimulus disappears). In the process, the arranged fixation frame and the masking stimulus eliminate the influence of the physiological factors of the eyes. And finally, displaying a judgment interface in a fourth display area for prompting a user to select a real word or a fake word, wherein the presentation time is not more than 5000ms. The first display area, the second display area, the third display area and the fourth display area are sequentially displayed in a circulating manner, for example, the display is set to be displayed for 100 times for testing.

Further, the two-word still needs to be processed in the generating and screening process, in one embodiment, the font size, the color and the like in the UI interface design information of the vehicle-mounted information system are obtained, the commonly used two-word vocabulary in the vehicle-mounted information system is captured, and then the word frequency screening is performed. And eliminating the vocabulary with the word frequency lower than 5000 to form a real word lexicon. Then, the real words are disassembled, and new two-character pseudo words are randomly combined for the real words. In the process, the meaningful two-word can be eliminated through manual intervention and evaluation; and eliminating the false words with the vocabulary of the two words and judging the response time of the false words larger than two standard deviations, and outputting the false words as a false word bank. In this step, a certain amount of two-word words may be randomly captured for testing, for example, 100 two-word words are captured, wherein each half of the true word and the false word enters the program for random display. By controlling the word frequency to be higher than 5000, the invention avoids objections of the words in true and false judgment and the difference of judgment reaction time, and improves the accuracy in the word bank testing process.

The advantages of the invention for selecting the two-word for testing include: 1. on a physiological level, the information quantity which can be processed by the fovea centralis of human eyes at a single time is limited, and is generally about 2-4 characters, so that the number of the characters is not more than 4, and most experimental researches also use a large number of two-character words as experimental materials; 2. reading habits, most of the words familiar to people are two-word words or four-word words, and the three-word words are few, so the stimulation selection can be selected from the two-word words or the four-word words; 3. and the generation of the pseudo words is easier and the interference variable is less. By using the test judgment of the two-word, the user can use peripheral equipment such as a keyboard and the like to judge by inputting F as a true word and J as a false word.

Step 120: and receiving result data of the word true and false judgment of the user, and controlling the display content in the interface to dynamically change according to the data result.

The program collects test data results by receiving user input. In one embodiment, the data of the result of the receiving user's true and false judgment on the vocabulary comprises the vocabulary judgment accuracy and the vocabulary presentation time. In another embodiment, the receiving result data of the real and false judgment of the vocabulary by the user comprises the vocabulary judgment accuracy, the vocabulary presentation time and the subjective comfort level score of the user in the test process.

The method comprises the steps of reducing a presentation time threshold of display content according to the correct times of the user for carrying out true and false judgment on the vocabulary, and increasing the presentation time threshold of the display content according to the wrong times of the user for carrying out the true and false judgment on the vocabulary, wherein the vocabulary is a two-word, and the presentation time threshold is the mean value of the presentation time.

For example, the presentation time of the two-character word is dynamically displayed according to the response of the user, if the user continuously answers 3 times, the presentation time of the two-character word is reduced by 25%, if the user answers one time in error, the presentation time of the two-character word is increased by 25%, and the starting time can be set to 800ms. Whether the size of the font size under the current test environment is proper or not can be determined through the dynamic presentation time display, and the presentation time is also adopted for screening and determining in the subsequent steps.

Step 130: and acquiring presentation time thresholds of the display contents under different test conditions from the data results.

The presentation time of the related display contents is recorded in the process of judging the truth and the falseness of the user, the presentation time gradually approaches to a stable physiological limit value along with the increase of the vocabulary judging task times, and the average value of the last 20 display contents is taken as the vocabulary presentation time threshold under the condition.

Step 140: and comparing the presentation time threshold with the normal mode index to obtain a character readability grade result, wherein the character readability grade result comprises a clear character size, a minimum character size, a cautious character size and an unrecommended character size.

For example, the normal mode index is a data table of the text readability grade result corresponding to the interval value of the presentation time, the presentation time threshold values corresponding to the word sizes in different test conditions are compared with the threshold limit value in the normal mode index, and the text readability grade result is output according to the comparison result.

In the step, the presentation time threshold values corresponding to the word sizes in different test conditions are compared with the threshold limit value in the normal mode index, and the word legibility grade result is output according to the comparison result, so that whether the word size is suitable for the vehicle-mounted information system or not is determined.

As shown in fig. 4, before the above steps, a construction normal mode index construction is further included, and the steps of the construction process include:

step 410: displaying a vocabulary forced selection interface under a plurality of conditions, wherein the display content in the interface comprises meaningful real words or nonsensical fake words;

step 420: and receiving result data of the word true and false judgment of the user, and controlling the display content in the interface to dynamically change according to the data result.

The above two steps can refer to step 110 and step 120, and are not described again.

Step 430: and acquiring the presentation time threshold and the subjective comfort level score of the display content under different test conditions from the data result. The subjective comfort level scoring can be carried out judging and scoring after true and false judgment, and associated recording is carried out.

For example, the different location conditions include: acquiring presentation time thresholds and subjective comfort degree scores corresponding to different word sizes when the sizes are 500mm, 700mm, 800mm and 900mm; under different brightness conditions and when the contrast is 2, 3, 4, 5, 6 and 7, acquiring presentation time thresholds and subjective comfort degree scores corresponding to different word sizes; and when the intervals of different characters are 0.9, 1.0 and 1.1, acquiring presentation time thresholds and subjective comfort degree scores corresponding to different character sizes.

Two data of a presentation time threshold and a subjective comfort level score can be output in the evaluation process, the larger the characters are, the better the readability is, the corresponding vocabulary presentation time threshold is in an exponential descending trend, and the corresponding subjective comfort level score is in an ascending trend. The subjective comfort degree score is used for checking and screening the word size, and the word size is graded by the subjective comfort degree score.

For example, in a testing process of the present invention, a plurality of users are tested for 12 different conditions, including 3 display positions and 4 colors, and 5 sizes of word sizes are tested under each condition. Whether the subjective comfort score is significantly different from the score 3 is calculated by an independent sample t test (the independent sample t test is a statistical method, and the probability of occurrence of a difference is deduced by using a t distribution theory so as to compare whether the difference between two averages is significant or not). The data which is obviously lower than 3 points is the first grade, the data which has no obvious difference with the 3 points is the second grade, the data which is obviously higher than 3 points is the third grade, and the data which is obviously higher than 3 points can be taken as the evaluation data in the process. If the word size of the first file is obviously uncomfortable to the user in the using process, the word size is judged to be smaller, the reading efficiency of the user is influenced, and the word size is not suitable for being used in a vehicle-mounted information system.

Step 440: and calculating a presentation time threshold and a subjective comfort level score of the displayed content under various conditions.

The testing process may refer to steps 110 to 120, and the user is tested using two-word with an interface having a gaze box and a masking stimulus, the input information of the user is collected, and the presentation time threshold and the subjective comfort score of the displayed content under the corresponding condition are calculated. The test thesaurus used may take the data or part of the data in step 110.

Step 450: and selecting the word size with the subjective comfort degree score higher than the preset score as a reference, and obtaining the word size with the difference on the presentation time threshold value through repeated measurement variance analysis.

Specifically, referring to the content in step 130, the subjective comfort level score is used to grade the evaluation word size. The subjective comfort degree score is 3 points as a preset score, data which are obviously lower than 3 points are the first grade, data which are not obviously different from the 3 points are the second grade, data which are obviously higher than 3 points are the third grade, and data which are obviously higher than 3 points can be taken as evaluation data in the process. For example, the test result with the font size of 22sp is a file, which represents that the user is obviously not favorable to view.

The expected presentation time threshold value is linearly changed along with the size of the font size, the linear change can be fitted to be a curve which is similar to the curve of the figure 3 and is obtained by fitting an exponential function y = exp (a + b/x) with a natural constant e as a base, wherein y is the presentation time of the vocabulary, x is the size of the font size, and ab is a constant, and the presentation time threshold of the display content is a vertical coordinate, and the size of the font size is a horizontal coordinate. Wherein the font size different from the time threshold of the third font size is the turning point of the legibility change. Specifically, by repeated measurement anova (repeated measurement anova is a statistical method for comparing variations in mean values between different font sizes to determine whether there is a difference between different font sizes, and by using the analysis method, it is possible to process presentation time thresholds for a plurality of font sizes), turning points of significant differences in presentation time of vocabularies under the same condition are compared. And observing whether the data result has expected linear change.

Step 460: and taking the intersection of the character size higher than the preset score and the character size with difference on the presentation time threshold value as the minimum character size, constructing a normal mode table based on the minimum character size, and distinguishing the presentation time threshold value interval of the character readability grade result.

For example, under a specific test condition, five word sizes of 20sp, 22sp, 26sp, 30sp and 34sp are tested, the subjective comfort degree score of 26sp, 30sp and 34sp is higher than a preset score of 3, and the position of a turning point in the relation between the presentation time threshold value of the display content and the word size is 26sp, the intersection 26sp is taken as the minimum word size, the word size larger than the 26sp is taken as a clear word size, the word size smaller than 26sp is taken as a used word size, and the smaller word size is taken as an unrenominated word size (the word size lower than the preset score can be selected). The four character sizes correspond to the range interval of the presentation time threshold. And if the test result is within a certain range interval, correspondingly outputting the test result as a corresponding test result.

Illustratively, the performing process includes: 1. the subjective comfort degree score is higher than a preset score of 3, the reserved data without significant difference have corresponding subjective comfort degree scores, the data with the score higher than 3 are used as effective reference data, and the corresponding word sizes are 26sp, 30sp and 34sp.2. The font size of the difference in the presentation time threshold is derived by repeated measures of analysis of variance, and as shown in fig. 3, the presentation time versus font size is significantly increased from 26sp compared to 34sp presentation time, with statistical differences. 3. And the subjective comfort degree score is higher than a preset score of 3, and the position of a turning point in the relation between the presentation time threshold of the display content and the character size is 26sp, and then the intersection 26sp is taken as the minimum character size. Taking the intersection 26sp as the minimum character size, taking the character size larger than the 26sp as the clear character size, taking the character size smaller than 26sp as the character size used with caution, and taking the smaller character size as the non-recommended character size (optionally, the character size lower than the preset score value). The four character sizes correspond to the range interval of the presentation time threshold, so that the normal index is constructed. As can be seen in fig. 5, the normal mode indicators have threshold intervals of presentation time corresponding to the minimum font size. The minimum word size corresponds to 35.6 to 48.5 milliseconds, and other word sizes have corresponding intervals.

As an exemplary embodiment, the method shown in fig. 4 constructs a normative index; the evaluation test was carried out as follows:

a total of 12 different conditions were tested, including 3 positions, 4 colors, and 5 sizes of font size were tested for each condition. The 3 positions are 700mm, 800mm and 900mm distance from the eyes to the screen, and 4 colors of the font are white, gray, golden and red. The 5-size character sizes are 20sp, 22sp, 26sp, 30sp and 34sp

Firstly, a watching frame for prompting the display position of characters is displayed in a first display area, and the display time is 1000ms. And then, displaying a forced selection vocabulary in a second display area, wherein the forced selection vocabulary is a two-word, the two-word is displayed in the range framed by the comment frame, and the display time is changed along with the accuracy of the answer of the user. And then displaying a presentation interface of the masking stimulus in a third display area, wherein the presentation time is 200ms. And finally, displaying a judgment interface in a fourth display area, wherein the presentation time is not more than 5000ms. The first display area, the second display area, the third display area and the fourth display area are sequentially displayed in a circulating mode. In the process, the result data of the real and false judgment of the vocabulary input by the user is received, wherein the result data comprises the vocabulary judgment accuracy, the vocabulary presentation time and the subjective comfort level score of the user in the test process.

And calculating the time average value of the vocabulary presentation time taken after 20 times of actual tests under each condition, wherein the average value represents the character legibility result under the condition. And comparing the result with a normal mode to judge the level of the character legibility of the condition. As shown in FIG. 6, the A1 test color is white, gray, gold, red, the font size is 20sp, 22sp, 26sp, 30sp, 34sp, and the test presentation time threshold is filled in the table. Reading the table reveals, for example, that the 22sp font size, when rendered grey, exhibits a time threshold of 40.70 milliseconds under test conditions. Based on the method, the conclusion that the word size is larger, smaller and suitable can be given at the same time. Assuming that the vocabulary presentation time mean value of the last 20 times of tests is 50.4ms, corresponding to the normal mode index, under the test condition, the vocabulary presentation time mean value is in the interval from 48.6 to 61.5 of the threshold limit value, the character legibility is in the third grade (the character size is used with caution), and the corresponding character size is smaller.

As shown in fig. 7, the present invention further provides an evaluation apparatus for word size grading of a vehicle-mounted information system, comprising:

the test module 71 is used for displaying an interface of vocabulary forced selection under different test conditions, and the display content in the interface comprises meaningful real words or meaningless fake words with different font display conditions;

the display control module 72 is configured to receive result data of the word authenticity judgment performed by the user, and control the display content in the interface to dynamically change according to the data result; for example, the presentation time of the display content is reduced according to the correct times of the user performing the true and false judgment on the vocabulary, and the presentation time of the display content is increased according to the wrong times of the user performing the true and false judgment on the vocabulary, wherein the vocabulary is a two-word.

The processing module 73 is configured to obtain presentation time thresholds of the display content under different test conditions from the data result;

an evaluation module 74, configured to compare the presentation time threshold with the normal mode index to obtain a text legibility level result, where the text legibility level result includes a clear font size, a minimum font size, a cautious font size, and an unrecommended font size; wherein the normal index comprises a corresponding relation between a presentation time threshold and a character legibility grade.

The test module 71 comprises a display module, the display module is used for displaying a watching frame for prompting a character display position in a first display area, displaying a forced word selection vocabulary in a second display area, displaying a presentation interface for masking stimulation in a third display area, eliminating visual afterimage phenomena, and displaying a judgment interface in a fourth display area, and is used for prompting a user to select a real word or a fake word; and the first display area, the second display area, the third display area and the fourth display area are sequentially and circularly displayed.

The display control module 72 includes a control unit configured to reduce the presentation time of the display content according to the number of times that the user correctly judges whether the vocabulary is true or false, and increase the presentation time of the display content according to the number of times that the user incorrectly judges whether the vocabulary is true or false, where the vocabulary is a two-word.

The evaluation module 74 includes an evaluation subunit, and the evaluation subunit is configured to compare the presentation time thresholds corresponding to the font sizes in different test conditions with the threshold limit value in the normal mode index, and output the text readability level result according to the comparison result.

The evaluation device further comprises a normal index construction module, which is used for executing the following contents:

displaying a vocabulary forcible selection interface under a plurality of conditions, wherein the displayed content comprises meaningful real words or meaningless fake words;

receiving result data of the word true and false judgment of a user, and controlling the display content in the interface to dynamically change according to the data result;

obtaining the presentation time threshold and the subjective comfort level score of the display content under different test conditions from the data result;

calculating a presentation time threshold and a subjective comfort level score of the display content under various conditions;

selecting the word size with the subjective comfort level score higher than a preset score as a reference, and obtaining the word size presenting the difference on the time threshold value through repeated measurement variance analysis;

and taking the intersection of the character size higher than the preset score and the character size with difference on the presentation time threshold value as the minimum character size, constructing a normal mode table based on the minimum character size, and distinguishing the presentation time threshold value interval of the character readability grade result.

The present invention also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the above-mentioned evaluation method for grading a font size of a telematics system.

It is understood that the computer-readable storage medium may include: any entity or device capable of carrying a computer program, recording medium, U-disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), software distribution medium, and the like. The computer program includes computer program code. The computer program code may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying computer program code, recording medium, U-disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), software distribution medium, and the like.

In some embodiments of the present invention, the apparatus may include a controller, and the controller is a single chip integrated with a processor, a memory, a communication module, and the like. The processor may refer to a processor included in the controller. The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable gate array (FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc.

Any process or apparatus descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (12)

1. A method for evaluating word size grading of a vehicle-mounted information system is characterized by comprising the following steps:

displaying an interface for forced selection of words under different test conditions, wherein the displayed content in the interface comprises meaningful real words or meaningless fake words;

receiving result data of the word true and false judgment of a user, and controlling the display content in the interface to dynamically change according to the data result;

obtaining presentation time thresholds of the display contents under different test conditions from the data result;

comparing the presentation time threshold value normal mode indexes to obtain a character readability grade result, wherein the character readability grade result comprises a clear character size, a minimum character size, a cautious character size and an unrecommended character size;

wherein the normal index comprises a corresponding relation between a presentation time threshold and a character legibility grade.

2. The evaluation method of claim 1, wherein the interface for displaying vocabulary forced selection under different test conditions comprises:

displaying a watching frame for prompting the display position of characters in a first display area, displaying a forced word selection vocabulary in a second display area, displaying a presentation interface for masking stimulation in a third display area, eliminating visual afterimage phenomena, and displaying a judgment interface in a fourth display area, wherein the judgment interface is used for prompting a user to select real words or fake words; and the first display area, the second display area, the third display area and the fourth display area are sequentially and circularly displayed.

3. The evaluation method according to claim 1, wherein controlling the display content in the interface to dynamically change according to the data result comprises:

and reducing the presentation time threshold of the display content according to the correct times of the user for performing true and false judgment on the vocabulary, and increasing the presentation time threshold of the display content according to the wrong times of the user for performing true and false judgment on the vocabulary, wherein the vocabulary is a two-word.

4. The evaluation method according to claim 1, wherein the data of the result of receiving the user's judgment on the truth of the vocabulary includes a vocabulary judgment accuracy and a vocabulary presentation time.

5. The evaluation method of claim 1, wherein comparing the presentation time threshold with a normative index to obtain a text readability level result comprises:

and comparing the presentation time threshold values corresponding to the word sizes in different test conditions with the threshold limit values in the normal mode indexes, and outputting the word readability grade result according to the comparison result.

6. The evaluation method according to claim 1, wherein the method of constructing the normative index includes:

displaying a vocabulary forced selection interface under a plurality of conditions, wherein the display content in the interface comprises meaningful real words or nonsensical fake words;

receiving result data of the word true and false judgment of a user, and controlling the display content in the interface to dynamically change according to the data result;

obtaining the presentation time threshold and the subjective comfort level score of the display content under different test conditions from the data result;

calculating a presentation time threshold and a subjective comfort level score of the display content under various conditions;

selecting the word size with the subjective comfort degree score higher than a preset score as a reference, and obtaining the word size with difference on a presentation time threshold value through repeated measurement variance analysis;

and taking the intersection of the character size higher than the preset score and the character size with difference on the presentation time threshold value as the minimum character size, and constructing a normal mode table based on the minimum character size so as to distinguish the presentation time threshold value interval of the character readability grade result.

7. An evaluation device for grading the font size of a vehicle-mounted information system, characterized by comprising:

the test module is used for displaying an interface for forced selection of the vocabulary under different test conditions, and the display content in the interface comprises meaningful real words or meaningless fake words;

the display control module is used for receiving result data of the real and false judgment of the vocabulary by the user and controlling the display content in the interface to dynamically change according to the data result;

the processing module is used for acquiring the presentation time threshold of the display content under different test conditions from the data result;

the evaluation module is used for comparing the presentation time threshold with the normal mode index to obtain a character readability grade result, wherein the character readability grade result comprises a clear character size, a minimum character size, a cautious character size and an unrecommended character size; wherein the normal index comprises a corresponding relation between a presentation time threshold and a character legibility grade.

8. The evaluation device according to claim 7, wherein the test module comprises a display module, the display module is used for displaying a watching frame for prompting a text presentation position in a first display area, displaying a forced word selection unit in a second display area, displaying a presentation interface for masking stimulation in a third display area, eliminating visual afterimage phenomena, and displaying a judgment interface in a fourth display area, and is used for prompting a user to select a true word or a false word; and the first display area, the second display area, the third display area and the fourth display area are sequentially and circularly displayed.

9. The apparatus according to claim 7, wherein the display control module includes a control unit configured to decrease the presentation time threshold of the display content according to a number of times of correctness of the user's true/false determination on the vocabulary, and increase the presentation time threshold of the display content according to a number of times of error of the user's true/false determination on the vocabulary, wherein the vocabulary is a two-word.

10. The evaluation device according to claim 7, wherein the evaluation module comprises an evaluation subunit, and the evaluation subunit is configured to compare the presentation time thresholds corresponding to the font sizes in different test conditions with the threshold limit value in the normal mode indicator, and output the text readability level result according to the comparison result.

11. The apparatus according to claim 7, further comprising a normative index constructing module configured to:

displaying a vocabulary forced selection interface under a plurality of conditions, wherein the display content in the interface comprises meaningful real words or nonsensical fake words;

receiving result data of the user for judging whether the vocabulary is true or false, and controlling the display content in the interface to dynamically change according to the data result;

acquiring a presentation time threshold and a subjective comfort level score of the display content under different test conditions from the data result;

calculating a presentation time threshold and a subjective comfort level score of the displayed content under various conditions;

selecting the word size with the subjective comfort degree score higher than a preset score as a reference, and obtaining the word size with difference on a presentation time threshold value through repeated measurement variance analysis;

and taking the intersection of the word size higher than the preset score and the word size different from the presentation time threshold value as the minimum word size, and constructing a normal mode table based on the minimum word size so as to distinguish the presentation time threshold value interval of the word readability grade result.

12. A computer-readable storage medium, on which a computer program is stored which, when executed by a computer, performs the method of any one of claims 1 to 6.

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