CN102270427B - Method and apparatus for enhancing reading effect of electronic book and electronic terminal - Google Patents
Method and apparatus for enhancing reading effect of electronic book and electronic terminal Download PDFInfo
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Abstract
The invention provides a method and an apparatus for enhancing a reading effect of an electronic book and an electronic terminal capable of reading an electronic book. The method comprises the following steps that: a photosensitive assembly obtains an illumination intensity value in a current environment; relations between the illumination intensity value and a preset upper limit value, a preset lower limit value and a preset critical threshold value of a non-sensitive area to chroma are determined; if the illumination intensity value is greater than the upper limit value or less than the lower limit value, a chromatic value of a foreground character is equal to the illumination intensity value and a background chromatic value is equal to a result that is caused by subtracting the illumination intensity value from 255; if the illumination intensity value is between the upper limit value and the critical threshold value, the chromatic value of the foreground character is equal to the upper limit value and the background chromatic value is equal to the lower limit value; if the illumination intensity value is between the lower limit value and the critical threshold value, the chromatic value of the foreground character is equal to the lower limit value and the background chromatic value is equal to the upper limit value; and a content of an electronic book is displayed according to the chromatic values of the foreground character and the background. According to the invention, chromas of a foreground character and a background are adjusted according to an environmental light intensity, so that a contrast effect can be strengthened to the greatest extent; therefore, it is convenient for a user to read and visual fatigue can be reduced.
Description
Technical field
The present invention relates to e-book technical field, particularly relate to a kind of method and apparatus that strengthens e-book reading effect, and, a kind of electric terminal with e-book reading function.
Background technology
Follow the development of hand-holding type electronic reading apparatus, e-book is stepped into people's reading habit day by day.At present, the main application of palm type electronic book reader is to read various e-book, above-mentioned reader is in the time showing e-book content, often taking black and white as main, generally blank for mainly representing form with prospect word and background, namely traditional " white gravoply, with black engraved characters " is for leading or provide self-defining " black matrix wrongly written or mispronounced character "; The former follows that paper book printing and reading habit develop and the traditional approach that comes, and the latter is the application mode producing according to personalized reading habit.
But the hand-holding type electronic reading apparatus of displaying contents for being carried, in continuous motion, due to the environment in moving process, the particularly continuous variation of light power, above-mentioned simple display mode, have the problem of poor effect for the reading of human eye, manual mode is adjusted both inconveniences also cannot reach best contrast effect.As everyone knows, human eye is different to the sensitivity of same object under dark and high light environment, and in prior art, the solution of all kinds of readers is improved visual effect by adjusting backlight illumination and contrast; But, find by test, under high light environment, the action effect of above-mentioned adjusting is very undesirable, cannot obviously improve reading effect, what usually see is a slice white or grey, easily makes eye fatigue, cannot read normally.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of method that strengthens e-book reading effect, can solve prior art, under different light rays intensity, e-book reading effect be regulated to undesirable problem.
The present invention also provides a kind of device and a kind of electric terminal with e-book reading function that strengthens e-book reading effect, to ensure said method application in practice.
In order to address the above problem, the invention discloses a kind of method that strengthens e-book reading effect, comprising: described photosensitive components obtains the illumination intensity value of current environment; Judge the relation between described illumination intensity value and the default non-sensitive district of colourity higher limit, lower limit and critical threshold values; If described illumination intensity value is greater than described higher limit or is less than described lower limit, prospect word chromatic value equals described illumination intensity value, and background chromatic value equals 255 and deducts described illumination intensity value; If described illumination intensity value is between described higher limit and described critical threshold values, described prospect word chromatic value equals described higher limit, and described background chromatic value equals described lower limit; If described illumination intensity value is between described lower limit and described critical threshold values, described prospect word chromatic value equals described lower limit, and described background chromatic value equals described higher limit; Wherein, chromatic value 0 represents all black, and chromatic value 255 represents whole white; Show e-book content according to described prospect word chromatic value and described background chromatic value.
Preferably, before the relationship step between the described illumination intensity value of described judgement and the default non-sensitive district of colourity higher limit, lower limit and critical threshold values, also comprise: the higher limit in the non-sensitive district of colourity, lower limit and critical threshold values described in initialization, wherein, described higher limit is not less than lower limit, described critical threshold values is between described higher limit and lower limit, and the span of described higher limit and lower limit is 0～255.
Preferably, the span of described higher limit is 154～164, and the span of described lower limit is 90～100, and the span of described critical threshold values is 127～128.
Preferably, obtain at described photosensitive components and also comprise that display mode sets step before the illumination intensity value step of current environment: if described display mode is automatic color-changing conversion, automatically perform subsequent step; If described display mode is manual color change conversion, need user to start subsequent step according to environmental change situation.
According to another preferred embodiment of the present invention, a kind of device that strengthens e-book reading effect is also disclosed, comprise photosensitive components, initialization unit, judging unit and display unit: described photosensitive components, for the intensity of illumination of acquisition environment, obtains the illumination intensity value of current environment; Described initialization unit is preset or is revised for the prospect word chromatic value of higher limit, lower limit, critical threshold values and e-book to the non-sensitive district of colourity, the initial value of background chromatic value; Described judging unit, for analyzing the relation between illumination intensity value that described photosensitive components obtains and described the initialization unit default non-sensitive district of colourity higher limit, lower limit and critical threshold values, is determined and calls described initialization unit described prospect word chromatic value and background chromatic value are modified; Wherein, if described illumination intensity value is greater than described higher limit or is less than described lower limit, described prospect word chromatic value equals described illumination intensity value, and described background chromatic value equals 255 and deducts described illumination intensity value; If described illumination intensity value is between described higher limit and described critical threshold values, described prospect word chromatic value equals described higher limit, and described background chromatic value equals described lower limit; If described illumination intensity value is between described lower limit and described critical threshold values, described prospect word chromatic value equals described lower limit, and described background chromatic value equals described higher limit; Described display unit shows e-book content for described prospect word chromatic value and the background chromatic value set according to described initialization unit; Wherein, chromatic value 0 represents all black, and chromatic value 255 represents whole white.
Preferably, the parameter of described initialization unit arranges scope and is: the span of described higher limit is 154～164, and the span of described lower limit is 90～100, and the span of described critical threshold values is 127～128.
Preferably, described device also comprises display mode setting unit, for the display mode of e-book is set; Described display mode comprises automatic color-changing translative mode and manual color change translative mode.
According to another preferred embodiment of the present invention, a kind of electric terminal with e-book reading function is also disclosed, comprise the device that strengthens e-book reading effect, described device comprises photosensitive components, initialization unit, judging unit and display unit: described photosensitive components, for the intensity of illumination of acquisition environment, obtains the illumination intensity value of current environment; Described initialization unit is preset or is revised for the prospect word chromatic value of higher limit, lower limit, critical threshold values and e-book to the non-sensitive district of colourity, the initial value of background chromatic value; Described judging unit, for analyzing the relation between illumination intensity value that described photosensitive components obtains and described the initialization unit default non-sensitive district of colourity higher limit, lower limit and critical threshold values, is determined and calls described initialization unit described prospect word chromatic value and background chromatic value are modified; Wherein, if described illumination intensity value is greater than described higher limit or is less than described lower limit, described prospect word chromatic value equals described illumination intensity value, and described background chromatic value equals 255 and deducts described illumination intensity value; If described illumination intensity value is between described higher limit and described critical threshold values, described prospect word chromatic value equals described higher limit, and described background chromatic value equals described lower limit; If described illumination intensity value is between described lower limit and described critical threshold values, described prospect word chromatic value equals described lower limit, and described background chromatic value equals described higher limit; Described display unit shows e-book content for described prospect word chromatic value and the background chromatic value set according to described initialization unit; Wherein, chromatic value 0 represents all black, and chromatic value 255 represents whole white.
Preferably, described device also comprises display mode setting unit, for the display mode of e-book is set; Described display mode comprises automatic color-changing translative mode and manual color change translative mode.
Preferably, described electric terminal is personal digital assistant (PDA, Personal Digital Assistant), handheld device (PSP, PlayStation Portable) or mobile phone terminal.
Compared with prior art, the present invention has the following advantages:
The invention provides a kind of scheme of adjusting prospect word colourity and background clear area colourity according to ambient light intensity, and " black matrix wrongly written or mispronounced character " and " white gravoply, with black engraved characters " display effect under particular surroundings, can easy-to-read, reduces visual fatigue.
Compared with the mode of adjusting background luminance with prior art, the present invention program realizes by adjusting respectively the blank colourity of background and prospect word colourity, can strengthen to greatest extent contrast effect.
The present invention program can dynamically adjust according to light intensity background colourity and the prospect word colourity of e-book, therefore, can adapt to be carried, the reading environment of electric terminal in continuous motion.
The present invention program not only can be used for E-book reader, and other possesses the electric terminal of e-book reading function can also to be applied to PDA, PSP, mobile phone terminal etc.
Brief description of the drawings
Fig. 1 is the method one embodiment process flow diagram that the present invention strengthens e-book reading effect;
Fig. 2-a is related to schematic diagram between prospect word chromatic value of the present invention, background chromatic value and intensity of illumination;
Fig. 2-b is the demonstration situation schematic diagram of e-book under the present invention's " white gravoply, with black engraved characters " state;
Fig. 2-c is the demonstration situation schematic diagram of e-book under the present invention's " black matrix wrongly written or mispronounced character " state;
Fig. 3 is the structured flowchart that the present invention strengthens device one embodiment of e-book reading effect;
Fig. 4 is the structured flowchart of electronic equipment one embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
One of core idea of the present invention is: can know by contrast experiment, human eye is in the time reading " white gravoply, with black engraved characters " and " black matrix wrongly written or mispronounced character " word content, and the intensity of illumination that reaches good reading visual effect is completely different.Human eye get used to light softer or dark in read " white gravoply, with black engraved characters ", and the reading " black matrix wrongly written or mispronounced character " under stronger and outdoor high light in light intensity.Based on above-mentioned principle, by sensor devices or the manual mode of setting, allow hand-holding type electronic reading apparatus can between " white gravoply, with black engraved characters " and " black matrix wrongly written or mispronounced character " or more accurate prospect word and the blank contrast colors of background, carry out adjustment and conversion under strong, low light condition, in specific environment, select better display effect to read with person easy to use.
For convenience of showing that with display screen colourity mate calculatings, be 0～255 according to total darkness environment to the complete white range of definition under sun direct projection by intensity of illumination, be defined as total darkness environment by 0,255 be defined as under direct sunlight entirely in vain.Photosensitive components is changed to the span value obtaining according to ambient lighting and be mapped to this interval of definition, thereby can be easily according to the intensity of illumination getting, calculate current content and show colourity numerical value, and then carry out fast location and the demonstration of prospect word and the blank gray scale color of background.
With reference to Fig. 1, show the present invention and strengthen the flow process of method one embodiment of e-book reading effect, specifically comprise the following steps:
Step 101: initialization system parameter;
Need initialized parameter to comprise the non-sensitive district of colourity higher limit, lower limit and critical threshold values, relation and span thereof between three parameter values are:
The non-sensitive district of lower limit≤colourity of the non-sensitive district of colourity higher limit
The non-sensitive district of lower limit≤colourity of the non-sensitive district of the colourity non-sensitive district of critical threshold values≤colourity higher limit
Lower limit≤255, the non-sensitive district of 0≤colourity
Higher limit≤255, the non-sensitive district of 0≤colourity
In this preferred embodiment, the non-sensitive district of colourity higher limit, lower limit and critical threshold values initialization value are respectively 160,95 and 127.
Step 102: photosensitive components obtains the illumination intensity value of current environment;
Step 103: judge whether above-mentioned illumination intensity value is greater than the non-sensitive district of default colourity higher limit, or be less than the non-sensitive district of default colourity lower limit? if so, go to step 104; Otherwise go to step 105;
Step 104: prospect word chromatic value is set to illumination intensity value, background chromatic value is set to (255-illumination intensity value); Go to step 108;
Step 105: judge whether above-mentioned illumination intensity value is greater than the critical threshold values in the non-sensitive district of default colourity, and be less than or equal to the non-sensitive district of default colourity higher limit? if so, go to step 106; Otherwise (be that above-mentioned illumination intensity value is less than or equal to the critical threshold values in the non-sensitive district of default colourity, and be more than or equal to the non-sensitive district of default colourity lower limit), goes to step 107;
Step 106: prospect word chromatic value is set to the non-sensitive district of default colourity higher limit, background chromatic value is set to the non-sensitive district of default colourity lower limit; Go to step 108;
Step 107: prospect word chromatic value is set to the non-sensitive district of default colourity lower limit, background chromatic value is set to the non-sensitive district of default colourity higher limit;
Step 108: the prospect word chromatic value of setting according to abovementioned steps and background chromatic value show e-book content.
In another preferred embodiment of the inventive method embodiment, before step 101, also comprise display mode setting step: if described display mode is automatic color-changing translative mode, automatically perform subsequent step; If described display mode is manual color change translative mode, need user to start subsequent step according to environmental change situation; In this preferred embodiment, default setting is automatic color-changing translative mode.
In said method embodiment, the non-sensitive district higher limit relating to for step 101, lower limit and critical threshold parameter, and the judgement of step 103～step 107 and assignment principle, to prospect and the responsive situation of background colourity with reference to human eye, obtain through contrast test, as Fig. 2-a shows prospect word chromatic value, graph of a relation between background chromatic value and intensity of illumination, in figure, transverse axis represents intensity of illumination, the longitudinal axis represents colourity, dotted line represents the relation (functional relation is: background chromatic value=255-illumination intensity value) between the blank colourity of background and intensity of illumination, solid line represents the relation (functional relation is: prospect word chromatic value=illumination intensity value) between prospect word colourity and intensity of illumination, dash box inside belongs to the non-sensitive district of color contrast, be the blank colourity of prospect word and background in this frame time contrast strong not, in actual applications, intensity of illumination is not done progressive variation at M (the non-sensitive district of colourity lower limit) to front and back, the region scenery degree between N (the non-sensitive district of colourity higher limit), the chromatic value of ordering corresponding to intensity of illumination point M, N is A and B (wherein: M=A, N=B).Because there is the non-sensitive district of above-mentioned light sensation, so can there is sudden change colourity phenomenon in the time that intensity of illumination changes, between " white gravoply, with black engraved characters " and " black matrix wrongly written or mispronounced character " also spoken of before, turn over mutually journey, the P point that this threshold limit value point is intensity of illumination in figure, the General Definition of obtaining of P value (the critical threshold values in the non-sensitive district of colourity) is cut apart place in the centre of M, N, and corresponding colourity intensity level is C point.
Wherein, the value of M and N is according to test determination, and can make the appropriate adjustments.Test determination, as M between 90～100, N between 154～164, P between 127～128 o'clock, can obtain more satisfactory display effect.Total trend is, total darkness environment is also that intensity of illumination is 0 o'clock, and prospect word is all black (prospect word chromatic value is 0), and background is whole white (background chromatic value is 255); Along with the enhancing gradually of intensity of illumination, prospect colourity strengthens, background colourity weakens (dimmed), arrive after M point, forward and backward scenery degree no longer changes with intensity of illumination, in more satisfactory gentle show state (now, prospect word chromatic value is A, and background chromatic value is B); Intensity of illumination arrives after P point, and forward and backward scenery degree jumps to the chromatic value that intensity of illumination N point is corresponding (now, prospect word chromatic value is B, and background chromatic value is A), but in the time that intensity of illumination is put variation from P to N, colourity is not done and changed; Intensity of illumination is from N point, and colourity is recovered again to continue with intensity of illumination and the each self-adjusting of colourity relation (that is: background chromatic value=255-illumination intensity value; Prospect word chromatic value=illumination intensity value).Fig. 2-b and Fig. 2-c show the effect of " wrongly written or mispronounced character black matrix " and " surplus white background " two kinds of extreme cases, it should be noted that, in reality, be not limited to two kinds of limiting cases shown in Fig. 2-b and Fig. 2-c, i.e. " the complete full text of an annotated book word of black background " or " complete white background and complete black word ", but can in colourity, carry out according to the variation of environment necessary fine setting, to reach best reading contrast.
For aforesaid each embodiment of the method, simple in order to describe, therefore it is all expressed as to a series of combination of actions, but those skilled in the art should know, the present invention is not subject to the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, said method embodiment all belongs to preferred embodiment, and related action and module might not be that the present invention is necessary.
With reference to Fig. 3, show the present invention and strengthen the structured flowchart of device one embodiment of e-book reading effect, specifically comprise initialization unit 21, photosensitive components 22, judging unit 23, display unit 24 and display mode setting unit 25, wherein:
Initialization unit 21: preset or revise for the prospect word chromatic value of the higher limit to the non-sensitive district of colourity, lower limit, critical threshold values and e-book, the initial value of background chromatic value;
Wherein, the parameter of initialization unit arranges rule and range of parameter values is:
The non-sensitive district of lower limit≤colourity of the non-sensitive district of colourity higher limit
The non-sensitive district of lower limit≤colourity of the non-sensitive district of the colourity non-sensitive district of critical threshold values≤colourity higher limit
The range of parameter values of the non-sensitive district of colourity lower limit, the non-sensitive district of colourity higher limit, prospect word chromatic value, background chromatic value is 0～255
In addition, the preferred span of the non-sensitive district of above-mentioned colourity higher limit is 154～164, and the preferred span of the non-sensitive district of colourity lower limit is 90～100, and the span of the critical threshold values in the non-sensitive district of colourity is 127～128.In this preferred embodiment, the non-sensitive district of colourity higher limit, lower limit and critical threshold values initialization value are respectively 160,95 and 127, and prospect word chromatic value and background colourity value initialization value are respectively 160 and 95.
Photosensitive components 22: for the intensity of illumination of detection system environment of living in, obtain the illumination intensity value of current environment;
Judging unit 23: for analyzing the relation between illumination intensity value that photosensitive components 22 obtains and the initialization unit 21 default non-sensitive district of colourity higher limit, lower limit and critical threshold values, determine and call initialization unit 21 prospect word chromatic value and background chromatic value are modified;
Wherein:
When " the non-sensitive district of illumination intensity value > colourity higher limit " or " the non-sensitive district of illumination intensity value < colourity lower limit ", prospect word chromatic value=illumination intensity value, background chromatic value=255-illumination intensity value;
In the time of " illumination intensity value is between the critical threshold values of colourity non-sensitive district higher limit and the non-sensitive district of colourity " (i.e. " the critical threshold values < in the non-sensitive district of colourity illumination intensity value colourity≤non-sensitive district higher limit "), the non-sensitive district of prospect word chromatic value=colourity higher limit, the non-sensitive district of background chromatic value=colourity lower limit;
In the time of " illumination intensity value is between the critical threshold values of colourity non-sensitive district lower limit and the non-sensitive district of colourity " (i.e. " the non-sensitive district of colourity critical threshold values in lower limit≤illumination intensity value colourity≤non-sensitive district "), the non-sensitive district of prospect word chromatic value=colourity lower limit, the non-sensitive district of background chromatic value=colourity higher limit.
Display unit 24: show e-book content for prospect word chromatic value and the background chromatic value set according to initialization unit 21.
Display mode setting unit 25: for the display mode of e-book is set, wherein, display mode comprises automatic color-changing translative mode and manual color change translative mode.In this preferred embodiment, the default setting of display mode setting unit 25 is automatic color-changing translative mode.
With reference to Fig. 4, show the structured flowchart that the present invention has electric terminal one embodiment of e-book reading function, comprise the device 2 of e-book 1 and enhancing e-book reading effect, strengthen the device 2 of e-book reading effect, specifically comprise initialization unit 21, photosensitive components 22, judging unit 23, display unit 24 and display mode setting unit 25, wherein:
In e-book 1, preserve the content of e-book; The initialization unit 21 that strengthens the device 2 of e-book reading effect is preset or is revised for the prospect word chromatic value of the higher limit to the non-sensitive district of colourity, lower limit, critical threshold values and e-book, the initial value of background chromatic value; Photosensitive components 22, for the intensity of illumination of detection system environment of living in, obtains the illumination intensity value of current environment; Judging unit 23: for analyzing the relation between illumination intensity value that photosensitive components 22 obtains and the initialization unit 21 default non-sensitive district of colourity higher limit, lower limit and critical threshold values, determine and call initialization unit 21 prospect word chromatic value and background chromatic value are modified; Display unit 24 shows the content of e-book 1 for the prospect word chromatic value set according to initialization unit 21 and background chromatic value; Display mode setting unit 25 is set to automatic color-changing translative mode or manual color change translative mode for the display mode of e-book.
It should be noted that, the electric terminal in this preferred embodiment can be E-book reader, can be also PDA, PSP or the mobile phone terminal with e-book reading function.
It should be noted that in addition, said apparatus and electric terminal embodiment belong to preferred embodiment, and related unit and module might not be that the present invention is necessary.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For device embodiment of the present invention, because it is substantially similar to embodiment of the method, so description is fairly simple, relevant part is referring to the part explanation of embodiment of the method.
Above a kind of method and apparatus and a kind of electric terminal with e-book reading function that strengthens e-book reading effect provided by the present invention is described in detail, applied specific case herein principle of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; , for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention meanwhile.
Claims (10)
1. a method that strengthens e-book reading effect, is characterized in that, in the system at described e-book place, includes photosensitive components, and described method comprises:
Described photosensitive components obtains the illumination intensity value of current environment;
Photosensitive components is changed to the span value obtaining according to ambient lighting and be mapped to 0
-255, be about to 0 be defined as total darkness environment, 255 are defined as complete white under direct sunlight;
Judge the relation between described illumination intensity value and the default non-sensitive district of colourity higher limit, lower limit and critical threshold values; If described illumination intensity value is greater than described higher limit or is less than described lower limit, prospect word chromatic value equals described illumination intensity value, and background chromatic value equals 255 and deducts described illumination intensity value; If described illumination intensity value is between described higher limit and described critical threshold values, described prospect word chromatic value equals described higher limit, and described background chromatic value equals described lower limit; If described illumination intensity value is between described lower limit and described critical threshold values, described prospect word chromatic value equals described lower limit, and described background chromatic value equals described higher limit; Wherein, chromatic value 0 represents all black, and chromatic value 255 represents whole white, and the span of described higher limit and lower limit is 0
-255;
Show e-book content according to described prospect word chromatic value and described background chromatic value.
2. the method for claim 1, it is characterized in that, before the relationship step between the described illumination intensity value of described judgement and the default non-sensitive district of colourity higher limit, lower limit and critical threshold values, also comprise: the higher limit in the non-sensitive district of colourity, lower limit and critical threshold values described in initialization, wherein, described higher limit is not less than lower limit, and described critical threshold values is between described higher limit and lower limit.
3. method as claimed in claim 2, is characterized in that, the span of described higher limit is 154～164, and the span of described lower limit is 90～100, and the span of described critical threshold values is 127～128.
4. the method for claim 1, is characterized in that, obtains and also comprises that display mode sets step before the illumination intensity value step of current environment: if described display mode is automatic color-changing conversion, automatically perform subsequent step at described photosensitive components; If described display mode is manual color change conversion, need user to start subsequent step according to environmental change situation.
5. a device that strengthens e-book reading effect, is characterized in that, described device comprises photosensitive components, initialization unit, judging unit and display unit;
Described photosensitive components, for the intensity of illumination of acquisition environment, obtains the illumination intensity value of current environment;
Photosensitive components is changed to the span value obtaining according to ambient lighting and be mapped to 0
-255, be about to 0 be defined as total darkness environment, 255 are defined as complete white under direct sunlight;
Described initialization unit is preset or is revised for the prospect word chromatic value of higher limit, lower limit, critical threshold values and e-book to the non-sensitive district of colourity, the initial value of background chromatic value;
Described judging unit, for analyzing the relation between illumination intensity value that described photosensitive components obtains and described the initialization unit default non-sensitive district of colourity higher limit, lower limit and critical threshold values, is determined and calls described initialization unit described prospect word chromatic value and background chromatic value are modified; Wherein, if described illumination intensity value is greater than described higher limit or is less than described lower limit, described prospect word chromatic value equals described illumination intensity value, and described background chromatic value equals 255 and deducts described illumination intensity value; If described illumination intensity value is between described higher limit and described critical threshold values, described prospect word chromatic value equals described higher limit, and described background chromatic value equals described lower limit; If described illumination intensity value is between described lower limit and described critical threshold values, described prospect word chromatic value equals described lower limit, and described background chromatic value equals described higher limit;
Described display unit shows e-book content for described prospect word chromatic value and the background chromatic value set according to described initialization unit; Wherein, chromatic value 0 represents all black, and chromatic value 255 represents whole white, and the span of described higher limit and lower limit is 0
-255.
6. device as claimed in claim 5, it is characterized in that, the parameter of described initialization unit arranges scope: the span of described higher limit is 154～164, and the span of described lower limit is 90～100, and the span of described critical threshold values is 127～128.
7. device as claimed in claim 5, is characterized in that, described device also comprises display mode setting unit, for the display mode of e-book is set; Described display mode comprises automatic color-changing translative mode and manual color change translative mode.
8. an electric terminal with e-book reading function, is characterized in that, described electric terminal comprises the device that strengthens e-book reading effect, and described device comprises photosensitive components, initialization unit, judging unit and display unit;
Described photosensitive components, for the intensity of illumination of acquisition environment, obtains the illumination intensity value of current environment;
Photosensitive components is changed to the span value obtaining according to ambient lighting and be mapped to 0
-255, be about to 0 be defined as total darkness environment, 255 are defined as complete white under direct sunlight;
Described initialization unit is preset or is revised for the prospect word chromatic value of higher limit, lower limit, critical threshold values and e-book to the non-sensitive district of colourity, the initial value of background chromatic value;
Described judging unit, for analyzing the relation between illumination intensity value that described photosensitive components obtains and described the initialization unit default non-sensitive district of colourity higher limit, lower limit and critical threshold values, is determined and calls described initialization unit described prospect word chromatic value and background chromatic value are modified; Wherein, if described illumination intensity value is greater than described higher limit or is less than described lower limit, described prospect word chromatic value equals described illumination intensity value, and described background chromatic value equals 255 and deducts described illumination intensity value; If described illumination intensity value is between described higher limit and described critical threshold values, described prospect word chromatic value equals described higher limit, and described background chromatic value equals described lower limit; If described illumination intensity value is between described lower limit and described critical threshold values, described prospect word chromatic value equals described lower limit, and described background chromatic value equals described higher limit;
Described display unit shows e-book content for described prospect word chromatic value and the background chromatic value set according to described initialization unit;
Wherein, chromatic value 0 represents all black, and chromatic value 255 represents whole white, and the span of described higher limit and lower limit is 0
-255.
9. electric terminal as claimed in claim 8, is characterized in that, described device also comprises display mode setting unit, for the display mode of e-book is set; Described display mode comprises automatic color-changing translative mode and manual color change translative mode.
10. electric terminal as claimed in claim 8 or 9, is characterized in that, described electric terminal is E-book reader, personal digital assistant, handheld device or mobile phone terminal.
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