CN105654920A - Display device, image display method and gray scale brightness conversion method - Google Patents

Display device, image display method and gray scale brightness conversion method Download PDF

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Publication number
CN105654920A
CN105654920A CN201511028440.9A CN201511028440A CN105654920A CN 105654920 A CN105654920 A CN 105654920A CN 201511028440 A CN201511028440 A CN 201511028440A CN 105654920 A CN105654920 A CN 105654920A
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making
grey decision
brightness
value
brightness value
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CN105654920B (en
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杨文强
詹小静
黄敏
许育民
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Tianma Microelectronics Co Ltd
Xiamen Tianma Microelectronics Co Ltd
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Tianma Microelectronics Co Ltd
Xiamen Tianma Microelectronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Image Processing (AREA)

Abstract

The invention provides a display device, an image display method and a gray scale brightness conversion method. The gray scale brightness conversion method comprises the following steps: according to an input value, determining a first interval including the input value in a plurality of intervals of a gray scale brightness conversion approximate curve by utilizing an interpolation method; and acquiring an estimated output value by utilizing a pre-set number of times of bisection-method iteration in the first interval, and outputting the estimated output value, wherein the input value and the estimated output value are a pair of gray scale value and brightness value, which approximately correspond to each other, and the input value and the estimated output value are integers more than or equal to 0. The invention provides the display device capable of simplifying gray scale brightness conversion calculation, the image display method and the gray scale brightness conversion method.

Description

Display device, method for displaying image and gray-scale intensity conversion method
Technical field
The present invention relates to image display arts, particularly relate to display device, method for displaying image and the method for conversion between grey decision-making and brightness value.
Background technology
In the image of display shows, GTG be by the brightest and the darkest between brightness flop, divide into some parts. So that carrying out the screen intensity management and control that signal input is corresponding. Every digitized video is all combined by many points, and these points are also called pixel (pixels), and generally each pixel can present many different colors, and it is made up of three sub-pixels of red, green, blue (RGB). Each sub-pixel, its light source behind can show different gray scales. And GTG represents by the most secretly to the stratum level of brightness different the brightest. This intermediate level is more many, and the picture effect that can present is also more fine and smooth. It is to say, the color change of each point on screen, it is all brought by the gray scale variation of three the RGB sub-pixels constituting this point in fact. Therefore, when display actual displayed, it usually needs need the brightness of image seen and the grey decision-making of display sub-pixel to change user, to show the image of corresponding bright over the display.
But, in prior art, when brightness and GTG are changed, intensity gray scale transformation curve is typically directly utilized to change, but, when utilizing intensity gray scale transformation curve to change, amount of calculation is very big, it is easy to causing display to drive computational load excessive, response time is long.
On the other hand, the display grade of portable mobile terminal is just stepped up by consumer, and what high PPI (PixelPerInch, per inch pixel) showed designs and develops the big focus becoming display industry. The product of present stage more than 800PPI occurs, but the display floater of high PPI product exists a lot of problem: manufacturing process requires high, causes that the display floater fine ratio of product of the product of high PPI promotes difficulty, and cost is also difficult to reduce. In this context, sub-pixel renders (low PPI product, by pixel order of rationally arranging, makes it have the display effect of high PPI by pixel rendering) technology and arises at the historic moment, and provides a shortcut for high PPI technical market.But, the calculating of the mutually conversion of the especially needed intensity gray scale of sub-pixel Rendering, there is the purpose of high PPI display effect reaching low PPI product.
Summary of the invention
The defect that the present invention exists to overcome above-mentioned prior art, it is provided that a kind of method for displaying image simplifying gray-scale intensity conversion Calculation and the method for conversion between grey decision-making and brightness value.
According to an aspect of the present invention, it is provided that a kind of method of conversion between grey decision-making and brightness value, including: according to input value, utilize interpolation method to change at gray-scale intensity and multiple intervals of curve of approximation being determined, comprise this input value first is interval; And in described first interval, two way classification at most iteration pre-determined number is utilized to obtain estimation output valve, export described estimation output valve, described input value and described estimation output valve are grey decision-making corresponding to a pairing approximation and brightness value, wherein, described input value and described estimation output valve are the integer be more than or equal to 0.
Preferably, gray-scale intensity conversion curve of approximation generates according to following manner: take N number of point on gray-scale intensity transformation curve, uses straight line to substitute and obtain gray-scale intensity conversion curve of approximation between consecutive points.
Preferably, N is the arbitrary integer in 16 to 64.
Preferably, described gray-scale intensity transformation curve includes: with grey decision-making be abscissa, brightness value be vertical coordinate GTG-brightness transition curve; With brightness value for abscissa, grey decision-making is the brightness-GTG transformation curve of vertical coordinate, and accordingly, described gray-scale intensity conversion curve of approximation includes: GTG-brightness transition curve of approximation, for when described input value is grey decision-making, calculating output estimation brightness value; Brightness-GTG conversion curve of approximation, for when described input value is brightness value, calculating output estimation grey decision-making.
Preferably, in the following way in one on gray-scale intensity transformation curve, take N number of point: on gray-scale intensity transformation curve, non-equidistance takes N number of point; N number of point is taken at gray-scale intensity transformation curve non-equidistance in the projection of abscissa; And take N number of point at gray-scale intensity transformation curve non-equidistance in the projection of vertical coordinate.
Preferably, by revising the maximum on the vertical scale of described gray-scale intensity transformation curve, the coordinate figure of the N number of point taken is carried out figure place expansion.
Preferably, described GTG-brightness transition curve obtains according to equation below:
L=(G/Gmax)��*Lmod, wherein,
L represents that brightness value, G represent grey decision-making, GmaxRepresent maximum gray value, LmodRepresenting high-high brightness correction value, �� is parameter;
Described brightness-GTG transformation curve obtains according to equation below:
G=(L/Lmod)(-��)*Gmax, wherein,
L represents that brightness value, G represent grey decision-making, GmaxRepresent maximum gray value, LmodRepresent high-high brightness correction value; �� is parameter.
Preferably, �� is the Arbitrary Digit in 2 to 3, LmodIt is 2n, wherein, n is the arbitrary integer in 10 to 15.
Preferably, in described first interval, utilize two way classification at most iteration pre-determined number to obtain estimation output valve to include: obtain the beginning and end in described first interval, calculate the midpoint of described beginning and end, and with described midpoint, described first interval is divided into the first subinterval and the second subinterval; The subinterval that comprises described input value in described first subinterval and described second subinterval is interval as first; And repeat the above steps, until the abscissa value at described input value and described starting point, described terminal or described midpoint is equal or pre-determined number described in iteration.
Preferably, described pre-determined number is the arbitrary integer in 5 to 10.
According to another aspect of the invention, also provide for a kind of method for displaying image, be applied on the display device with first resolution, including: according to image to display, obtain the grey decision-making of each sub-pixel on described display device; Using described grey decision-making as input value, utilize the method for conversion between grey decision-making and brightness value described above, output estimation brightness value; Carry out sub-pixel according to described estimation brightness value and render output median luminance value; Using described median luminance value as input value, utilize the method for conversion between grey decision-making and brightness value described above, output estimation grey decision-making; Showing the image with second resolution according to described estimation grey decision-making, described second resolution is more than described first resolution.
According to another aspect of the invention, also provide for a kind of display device, including: display floater, there is described first resolution; Drive circuit, couples with shown display floater, is configured with method described above and drives described display floater to show the image with described second resolution.
Preferably, the coordinate figure of the N number of point taken on described gray-scale intensity transformation curve is stored in described drive circuit in table form.
Compared with prior art, the present invention has the advantage that
1) in conjunction with interpolation method and two way classification, under the premise ensureing computational accuracy and calculating accuracy, simplify the calculating of the conversion of brightness and GTG, reduce storage and the computational load of drive circuit;
2) speed improving image procossing improves the real-time that image shows;
3) use figure place to expand when gray-scale intensity transformation curve is taken by interpolation method and reduce computing loss; And
4) according to utilizing non-equidistant to take some gray-scale intensity transformation curve characteristic in interpolation method, the accuracy of operation result is improved further.
Accompanying drawing explanation
Its example embodiment being described in detail by referring to accompanying drawing, the above-mentioned and further feature of the present invention and advantage will be apparent from.
Fig. 1 illustrates the flow chart of the method for gray-scale intensity conversion according to embodiments of the present invention.
Fig. 2 illustrates the schematic diagram of GTG according to embodiments of the present invention-brightness transition curve.
Fig. 3 illustrates the schematic diagram of GTG according to embodiments of the present invention-brightness transition curve of approximation.
Fig. 4 illustrates the schematic diagram of the coordinate figure of the multiple points taken at GTG-brightness transition curve stored in a tabular form according to embodiments of the present invention.
Fig. 5 A illustrates that GTG according to embodiments of the present invention is converted to the flow chart of the method for brightness.
Fig. 5 B illustrates that the GTG according to one specific embodiment of the present invention is converted to the schematic diagram of the method for brightness.
Fig. 6 illustrates the schematic diagram of brightness according to embodiments of the present invention-GTG transformation curve.
Fig. 7 illustrates the schematic diagram of brightness according to embodiments of the present invention-GTG conversion curve of approximation.
Fig. 8 A illustrates the flow chart of the method that brightness transition according to embodiments of the present invention is GTG.
Fig. 8 B illustrates the schematic diagram of the method that brightness transition is GTG according to one specific embodiment of the present invention.
Fig. 9 illustrates the schematic diagram of method for displaying image according to embodiments of the present invention.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing. But, example embodiment can be implemented in a variety of forms, and is not understood as limited to embodiment set forth herein; On the contrary, it is provided that these embodiments make the present invention will fully and completely, and the design of example embodiment is conveyed to those skilled in the art all sidedly. Accompanying drawing labelling identical in the drawings represents same or similar structure, thus will omit repetition thereof.
Described feature, structure or characteristic can be combined in one or more embodiment in any suitable manner.In the following description, it is provided that many details are thus providing fully understanding embodiments of the present invention. But, one of ordinary skill in the art would recognize that, it does not have one or more in specific detail, or adopt other method, constituent element, material etc., it is also possible to put into practice technical scheme. In some cases, known features, material or operation are not shown in detail or describe to avoid the fuzzy present invention.
In order to simplify during image shows, the calculating process of conversion between GTG and brightness, the invention provides the method changed between grey decision-making and brightness value in conjunction with interpolation method and two way classification, illustrate the flow chart of method of gray-scale intensity conversion according to embodiments of the present invention with specific reference to Fig. 1, Fig. 1.
Specifically, Fig. 1 illustrates two steps:
S110: according to input value, utilizes interpolation method to change at gray-scale intensity and determines in multiple intervals of curve of approximation that comprise this input value first is interval.
Specifically, interpolation method, by taking several points on gray-scale intensity transformation curve, forms multiple interval, utilizes the curve of specific function to be used as the approximate of primitive curve in multiple intervals. This specific function can be linear function, quadratic function, power function, inverse function etc. In order to reduce the amount of calculation of gray-scale intensity conversion further, what present invention preferably uses that the straight line represented by linear function is used as in each interval primitive curve is approximate. In other words, present invention advantageously uses linear interpolation method to determine gray-scale intensity conversion curve of approximation.
S120: in the first interval, utilizes two way classification at most iteration pre-determined number to obtain estimation output valve, output estimation output valve.
Specifically, two way classification is by the calculating at interval interior midpoint, this interval is divided into less interval, using the less interval at input value place as needing the interval calculating midpoint to be further iterated, when after iteration pre-determined number or when the abscissa value of current midpoint is equal with input value, when being exported as estimation output valve by the ordinate value of front middle point coordinates, input value and estimation output valve are the integer be more than or equal to 0.
In actual conversion, when input value is grey decision-making, according to above-mentioned steps S110 and step S120, it is possible to output estimation brightness value; When input value is brightness value, according to above-mentioned steps S110 and step S120, it is possible to output estimation grey decision-making.
In order to be further elaborated with the method for conversion between GTG and brightness provided of the present invention, describe in conjunction with Fig. 2 to 5, when input grey decision-making to obtain the conversion method of estimation brightness value.
With reference first to Fig. 2 to Fig. 4, it illustrates the generation process of GTG-brightness transition curve of approximation of the present invention.
Specifically, Fig. 2 illustrates the schematic diagram of GTG according to embodiments of the present invention-brightness transition curve. Described GTG-brightness transition curve with grey decision-making be abscissa, brightness value for vertical coordinate, and according to equation below obtain:
L=(G/Gmax)��*Lmod, wherein,
L represents that brightness value, G represent grey decision-making, GmaxRepresent maximum gray value, LmodRepresenting high-high brightness correction value, �� is parameter. G in the present embodimentmaxIt is 255, in other change case, GmaxIt is 2m-1, m can be the arbitrary integer in 6 to 10. In order to brightness value corresponding for low grey decision-making part is spaced out, LmodIt is 2n, wherein, n is the arbitrary integer in 10 to 15. In this embodiment, n is preferably 12. Parameter alpha is the Arbitrary Digit in 2 to 3.In this embodiment, �� is preferably 2.2. In other words, the GTG shown in Fig. 2-brightness transition curve is according to formula L=(G/255)2.2* 4096 obtain. Wherein, grey decision-making G ranges for 0-255, and brightness value L range for 0-4095, the grey decision-making G of each integer corresponding, it is possible to obtain a corresponding integer brightness value L.
GTG shown in Fig. 2-brightness transition curve takes N number of point, uses straight line to substitute between consecutive points and obtain gray-scale intensity conversion curve of approximation, as shown in Figure 3. In the present embodiment, by above-mentioned high-high brightness correction value LmodValue, the coordinate figure of the N number of point taken is carried out figure place expansion. Specifically, by making above-mentioned high-high brightness correction value LmodValue by part (the such as grey decision-making partial trace less than 50 comparatively mild for GTG-brightness transition curve, being diagrammatically only by property illustrates the part that GTG-brightness transition curve is comparatively mild herein, not by comparatively mild for GTG-brightness transition curve partially defined at the grey decision-making partial trace less than 50) brightness value corresponding to grey decision-making space out, and then make when the part that GTG-brightness transition curve is comparatively mild takes, reduce the situation of brightness value corresponding to two different grey decision-making, thus improving the accuracy of calculating, reduce transformed error. Specifically, in the present embodiment, the GTG shown in Fig. 2-brightness transition curve takes 16 points, as shown in A1-A16. In some change case, according to the balance requirement calculating accuracy and computational load, it is also possible to take 18 points, 32 points, 64 points on GTG-brightness transition curve, or other integer points in 16 to 64.
Further, due to the present invention preferably, utilizing linear interpolation method to obtain GTG-brightness transition curve of approximation, be straight line to make the GTG-brightness transition curve approximation between two points taken, the present invention utilizes the mode of non-equidistance to take a little on gray-scale intensity transformation curve. Such as, in the present embodiment, on GTG-brightness transition curve, non-equidistance takes N number of point to obtain GTG-brightness transition curve of approximation. In other words, distance between the N number of point taken is also not all equal. Specifically, being first delay rear steep curve according to GTG-brightness transition curve that above-mentioned formula obtains, therefore, in order to make to be approximately straight line between the N number of point taken, then the distance between the N number of point taken can be gradually reduced. In some change case, as long as meeting the characteristic of GTG-brightness transition curve to realize interpolation method, the present invention can also take N number of point at GTG-brightness transition curve non-equidistance in the projection of abscissa or take N number of point to obtain GTG-brightness transition curve of approximation at GTG-brightness transition curve non-equidistance in the projection of vertical coordinate. In other change case, the present invention can also utilize equally spaced mode to take a little on GTG-brightness transition curve, for instance, the distance between the N number of point taken is all equal.
GTG-brightness transition curve of approximation that said method is formed is utilized to be stored by the mode of form. Specifically, the coordinate figure of the multiple points taken on GTG-brightness transition curve is stored in a form and represents this GTG-brightness transition curve of approximation, as shown in Figure 4. In some change case, it is also possible to change the figure place precision of stored brightness value according to the demand of Practical Calculation precision and computational load, for instance, it is possible to retain 2 significant digits.
Further, with reference to Fig. 5 A, the method illustrating to utilize two way classification that grey decision-making is converted to brightness value.
Step S510: input grey decision-making, searches the interval at the grey decision-making place of input according to Fig. 4.
Step S520: calculate the midpoint of the interval beginning and end in grey decision-making place.
Step S530: judge that whether the grey decision-making of input is more than the grey decision-making (being equivalent to the abscissa at midpoint) at the midpoint of calculating in step S520.
If step S530 judges that the grey decision-making of input is more than the grey decision-making at midpoint calculated in step S520, then perform step S540: using midpoint as interval starting point.
The grey decision-making at the midpoint that if the grey decision-making of step S530 judgement input is not more than in step S520 to be calculated, then perform step S560: determine whether that whether the grey decision-making of input is less than the grey decision-making at the midpoint of calculating in step S520.
If step S560 judges that the grey decision-making of input is less than the grey decision-making at midpoint calculated in step S520, then perform step S570: using midpoint as interval terminal.
If step S560 judges that the grey decision-making of input is equal to the grey decision-making at the midpoint calculated in step S520, then jump to step S580, using the brightness value (namely the vertical coordinate at midpoint) at current interval midpoint as estimating brightness value.
After step S540 and S570 determines new interval, in step S550 judge currently whether reach predetermined iterations further. Specifically, in order to ensure the computational accuracy that gray-scale intensity is changed, predetermined iterations can be the arbitrary integer in 5 to 10. Preferably, predetermined iterations can take 6 times.
If step S550 judges not up to predetermined iterations, then to redirect and continue executing with step S520.
If step S550 judges to reach predetermined iterations, then jump to step S580, using the brightness value (namely the vertical coordinate at midpoint) at current interval midpoint as estimating brightness value.
Step S590 is performed: determined estimation brightness value in output step S580 after step S580.
In the above-described embodiments, if in iterative process, the abscissa (grey decision-making) at midpoint that the grey decision-making of input obtains equal to certain iteration, but during also not up to iterations, then directly using the vertical coordinate (brightness value) at this midpoint as estimating brightness value. In a change case of above-described embodiment, if in each point stored by grey decision-making Fig. 4 just of input during the abscissa of certain point, then directly export the vertical coordinate of this point as estimation brightness value.
In conjunction with Fig. 4, Fig. 5 A and Fig. 5 B, with a specific embodiment, the method that grey decision-making is converted into brightness value is described.
Such as, predetermined iterations is 6 times, input grey decision-making be 192, this grey decision-making with an A9 for starting point and some A10 in the interval between terminal. The midpoint 1 calculating A9 (189,2119) and A10 (210,2672) is (199.5,2395.5). The grey decision-making 192 of input less than the abscissa 199.5 at this midpoint, then using this midpoint 1 as the terminal between new district, now performs the calculating of 1 two way classification. The midpoint 2 calculating A9 (189,2119) and (199.5,2395.5) further is (194.25,2257.25). The grey decision-making 192 of input less than the abscissa 194.25 of current midpoint 2, then using this midpoint 2 as the terminal between new district, now performs the calculating of 2 two way classificatioies. The midpoint 3 calculating A9 (189,2119) and (194.25,2257.25) further is (191.625,2188.125). The grey decision-making 192 of input more than the abscissa 191.625 of current midpoint 3, then using this midpoint 3 as the starting point between new district, now performs the calculating of 3 two way classificatioies.The midpoint 4 calculating (191.625,2188.125) and (194.25,2257.25) further is (192.9375,2222.6875). The grey decision-making 192 of input less than the abscissa 192.9375 of current midpoint 4, then using this midpoint 4 as the terminal between new district, now performs the calculating of 4 two way classificatioies. The midpoint 5 calculating (191.625,2188.125) and (192.9375,2222.6875) further is (192.28125,2205.40625). The grey decision-making 192 of input less than the abscissa 192.28125 of current midpoint 5, then using this midpoint 5 as the terminal between new district, now performs the calculating of 5 two way classificatioies. The midpoint 6 calculating (191.625,2188.125) and (192.375,2205.40625) further is (191.953125,2196.76562). The grey decision-making 192 of input is more than the abscissa 191.953125 of current midpoint 6, then using this midpoint 6 as the starting point between new district, owing to now performing predetermined iterations, the namely calculating of 6 two way classificatioies, therefore, by the vertical coordinate 2196.76562 of current midpoint 6 (191.953125,2196.76562) as estimation brightness value. Preferably, round 2196.76562, using integer 2197 as estimating brightness value. If directly according to L=(G/255)2.2* 4096, when inputting G and being 192, obtain L=2193.988, rounding acquisition intrinsic brilliance value to 2193.988 is 2194. As can be seen here, the difference of estimation brightness value and intrinsic brilliance value is 3, and its relative error is 0.13%. In the calculating process at midpoint, it is also possible to the requirement according to computational accuracy, do not retain arithmetic point, retain one decimal place, retain 2 significant digits or other modes.
Further, in actual applications, grey decision-making provided by the invention is converted to the relative error of the method for brightness value less than 1.31%. As can be seen here, utilize gray-scale intensity conversion method provided by the invention that gray-scale intensity is changed, this not only reduces amount of calculation, it is ensured that computational accuracy and accuracy.
Describe below in conjunction with Fig. 6 to 8B, when input brightness value to obtain the conversion method of estimation grey decision-making.
With reference first to Fig. 6 to Fig. 7, it illustrates that the brightness-GTG of the present invention changes the generation process of curve of approximation.
Specifically, Fig. 6 illustrates the schematic diagram of brightness according to embodiments of the present invention-GTG transformation curve. Described brightness-GTG transformation curve with brightness value be abscissa, grey decision-making for vertical coordinate, and according to equation below obtain:
G=(L/Lmod)(-��)*Gmax, wherein,
The inverse function of its function represented by GTG-brightness transition curve. G in the present embodimentmaxIt is 255. LmodIt is 2n, in this embodiment, n is preferably 12. Parameter alpha is preferably 2.2. In other words, the brightness shown in Fig. 6-GTG transformation curve is according to formula G=(L/4096)-2.2* 255 obtain. Wherein, grey decision-making G ranges for 0-255, and brightness value L range for 0-4095, the grey decision-making G of the corresponding integer of the brightness value L of multiple integers.
Brightness shown in Fig. 6-GTG transformation curve takes N number of point, uses straight line to substitute between consecutive points and obtain gray-scale intensity conversion curve of approximation, as shown in Figure 7. In the present embodiment, by above-mentioned high-high brightness correction value LmodValue, the coordinate figure of the N number of point taken is carried out figure place expansion. Specifically, by making above-mentioned high-high brightness correction value LmodValue grey decision-making corresponding for the brightness value of part comparatively mild for brightness-GTG transformation curve is spaced out, and then make at comparatively mild part (the such as brightness value partial trace more than 2000 of brightness-GTG transformation curve, being diagrammatically only by property illustrates the part that brightness-GTG transformation curve is comparatively mild herein, not by comparatively mild for brightness-GTG transformation curve partially defined at the brightness value partial trace more than 2000) when taking point (the transverse and longitudinal coordinate of this point is left integer), it is reduced as far as two points taken and there is different brightness values, but there is the situation of identical grey decision-making, thus improving the accuracy of calculating, reduce transformed error.Specifically, in the present embodiment, the brightness shown in Fig. 5-GTG transformation curve takes 17 points, as shown in B1-B17. In some change case, according to the balance requirement calculating accuracy and computational load, it is also possible to take 16 points, 32 points, 64 points on brightness-GTG transformation curve, or other integer points in 16 to 64.
Further, due to the present invention preferably, utilizing linear interpolation method to obtain brightness-GTG conversion curve of approximation, in order to make the brightness-GTG transformation curve between take two points be approximately straight line, the present invention utilizes the mode of non-equidistance to take a little on gray-scale intensity transformation curve. Such as, in the present embodiment, on brightness-GTG transformation curve, non-equidistance takes N number of point to obtain brightness-GTG conversion curve of approximation. In other words, distance between the N number of point taken is also not all equal. Specifically, being first steep rear slow curve according to brightness-GTG transformation curve that above-mentioned formula obtains, therefore, in order to make to be approximately straight line between the N number of point taken, then the distance between the N number of point taken can be gradually increased. In some change case, as long as meeting the characteristic of brightness-GTG transformation curve to realize interpolation method, the present invention can also take N number of point at brightness-GTG transformation curve non-equidistance in the projection of abscissa or take N number of point to obtain brightness-GTG conversion curve of approximation at brightness-GTG transformation curve non-equidistance in the projection of vertical coordinate. In other change case, the present invention can also utilize equally spaced mode to take a little on brightness-GTG transformation curve, for instance, the distance between the N number of point taken is all equal.
Brightness-GTG conversion curve of approximation that said method is formed is utilized to be stored by the mode of form. Specifically, the coordinate figure of the multiple points taken on brightness-GTG transformation curve is stored in a form and represents this brightness-GTG conversion curve of approximation, similar with the form shown in Fig. 4, do not repeat them here.
Further, with reference to Fig. 8 A, the method illustrating to utilize two way classification to convert luminance values into grey decision-making.
Step S810: input brightness value, the interval according to the brightness value place of stored table lookup input.
Step S820: calculate the midpoint of the interval beginning and end in brightness value place.
Step S830: judge that whether the brightness value of input is more than the brightness value (being equivalent to the abscissa at midpoint) at the midpoint of calculating in step S820.
If step S830 judges that the brightness value of input is more than the brightness value at midpoint calculated in step S820, then perform step S840: using midpoint as interval starting point.
If the brightness value of step S830 judgement input is less than the brightness value at the midpoint calculated in step S820, then perform step S860: determine whether that whether the brightness value of input is less than the brightness value at the midpoint of calculating in step S820.
If step S860 judges that the brightness value of input is less than the brightness value at midpoint calculated in step S820, then perform step S870: using midpoint as interval terminal.
If step S860 judges that the brightness value of input is equal to the brightness value at the midpoint calculated in step S520, then jump to step S880, using the grey decision-making (namely the vertical coordinate at midpoint) at current interval midpoint as estimating grey decision-making.
After step S840 and S870 determines new interval, in step S850 judge currently whether reach predetermined iterations further. Specifically, in order to ensure the computational accuracy that intensity gray scale is changed, predetermined iterations can be the arbitrary integer in 5 to 10.Preferably, predetermined iterations can take 6 times.
If step S850 judges not up to predetermined iterations, then to redirect and continue executing with step S820.
If step S850 judges to reach predetermined iterations, then jump to step S880, using the grey decision-making (namely the vertical coordinate at midpoint) at current interval midpoint as estimating grey decision-making.
Step S890 is performed: determined estimation grey decision-making in output step S880 after step S880.
In the above-described embodiments, if in iterative process, the abscissa (brightness value) at midpoint that the brightness value of input obtains equal to certain iteration, but during also not up to iterations, then directly using the vertical coordinate (grey decision-making) at this midpoint as estimating grey decision-making. In a change case of above-described embodiment, if in the stored just each point of the brightness value of input during the abscissa of certain point, then directly exporting the vertical coordinate of this point as estimation grey decision-making.
In conjunction with Fig. 8 A and Fig. 8 B, with a specific embodiment, the method that grey decision-making is converted into brightness value is described.
Such as, predetermined iterations is 6 times, input brightness value be 2197, this brightness value with a B13 for starting point and some B14 in the interval between terminal. The midpoint calculating B13 (2119,189) and B14 (2672,210) is (2395.5,199.5). The brightness value 2197 of input less than the abscissa 2395.5 at this midpoint, then using this midpoint as the terminal between new district, now performs the calculating of 1 two way classification. The midpoint calculating B13 (2119,189) and (2395.5,199.5) further is (2257.25,194.25). The brightness value of input is 2197 less than the abscissa 2257.25 of current midpoint, then using this midpoint as the terminal between new district, now perform the calculating of 2 two way classificatioies. The midpoint calculating B13 (2119,189) and (2257.25,194.25) further is (2188.125,191.625). The brightness value 2197 of input more than the abscissa 2188.125 of current midpoint, then using this midpoint as the starting point between new district, now performs the calculating of 3 two way classificatioies. The midpoint calculating (2188.125,191.625) and (2257.25,194.25) further is (2222.6875,192.9375). The brightness value 2197 of input less than the abscissa 2222.6875 of current midpoint, then using this midpoint as the terminal between new district, now performs the calculating of 4 two way classificatioies. The midpoint calculating (2188.125,191.625) and (2222.6875,192.9375) further is (2205.40625,192.28125). The brightness value 2197 of input less than the abscissa 2205.40625 of current midpoint, then using this midpoint as the terminal between new district, now performs the calculating of 5 two way classificatioies. The midpoint calculating (2188.125,191.625) and (2205.40625,192.28125) further is (2196.76562,191.953125). The brightness value 2197 of input is more than the abscissa 2196.76562 of current midpoint, then using this midpoint as the starting point between new district, owing to now performing predetermined iterations, the namely calculating of 6 two way classificatioies, therefore, by the vertical coordinate 191.953125 of current midpoint (2196.76562,191.953125) as estimation grey decision-making. Preferably, round 191.953125, using integer 192 as estimating brightness value. If directly according to G=(L/4096)-2.2* 255, when inputting L and being 2197, obtain G=192.1198, rounding acquisition actual gray value to 192.1198 is 192. As can be seen here, estimation grey decision-making is approximately 0.16 with the error of actual gray value (not rounding).In the calculating process at midpoint, it is also possible to the requirement according to computational accuracy, do not retain arithmetic point, retain one decimal place, retain 2 significant digits or other modes. Further, in actual applications, brightness value provided by the invention is converted to the grey decision-making error of the method for grey decision-making less than 1. As can be seen here, utilize gray-scale intensity conversion method provided by the invention that gray-scale intensity is changed, this not only reduces amount of calculation, it is ensured that computational accuracy and accuracy.
Further, the present invention also provides for a kind of display device with low resolution, and it can have high-resolution display effect. Specifically, this display device can include the display floater with low resolution and the drive circuit coupled with this display floater. This drive circuit performs method for displaying image as shown in Figure 9, and this method for displaying image includes:
Step S910: according to image to display, obtains and has the grey decision-making of each sub-pixel RGB on the display device of low resolution.
Step S920: using grey decision-making as input value, utilizes the method for conversion between grey decision-making and brightness value as described in Fig. 2 to Fig. 5 B, output estimation brightness value.
Step S930: carry out sub-pixel according to estimation brightness value and render output median luminance value. Specifically, in step S930, by sub-pixel is carried out luminance distribution, to reach the effect rendered.
Step S940: using median luminance value as input value, utilizes the method changed between grey decision-making and brightness value as described in Fig. 6 to Fig. 8 B, output estimation grey decision-making;
Step S950: estimation grey decision-making is carried out gamma correction. Specifically, owing to a large amount of display produce simultaneously, in order to ensure that a large amount of display has consistent display effect, in addition it is also necessary to each display is carried out gamma correction, it is adjusted to, from estimation grey decision-making, the brightness value driving output further. Gamma correction in step S950 can be converted to the method for brightness value by grey decision-making provided by the invention and perform, it is also possible to the method being converted to brightness value by grey decision-making of the prior art performs, and does not repeat them here.
Step S960: drive circuit drives display floater to show according to gamma correction to have high-resolution image, to reach high-resolution display effect.
Preferably, the coordinate figure of the N number of point taken on gray-scale intensity transformation curve stores in the driving circuit in table form. Compare original directly by gray-scale intensity transformation curve coordinate figure a little store method in the driving circuit in table form, drive circuit stored data amount provided by the present invention is only about original 1/240. Display device provided by the present invention and method for displaying image, under the premise ensureing computational accuracy, simplify the conversion Calculation of brightness value and grey decision-making, both can guarantee that sub-pixel Rendering algorithms carried out the real-time of image procossing, and can reduce again drive circuit resource consumption.
Compared with prior art, the present invention has the advantage that
1) in conjunction with interpolation method and two way classification, under the premise ensureing computational accuracy, simplify the calculating of the conversion of brightness and GTG, reduce storage and the computational load of drive circuit;
2) speed improving image procossing improves the real-time that image shows;
3) use figure place to expand when gray-scale intensity transformation curve is taken by interpolation method and reduce computing loss; And
4) according to utilizing non-equidistant to take some gray-scale intensity transformation curve characteristic in interpolation method, the accuracy of operation result is improved further.
More than it is particularly shown and described the illustrative embodiments of the present invention. It should be understood that the invention is not restricted to disclosed embodiment, on the contrary, it is intended to contain the various amendments and equivalent replacement that comprise within the scope of the appended claims.

Claims (13)

1. the method for conversion between grey decision-making and brightness value, it is characterised in that including:
According to input value, utilize interpolation method to change at gray-scale intensity and multiple intervals of curve of approximation being determined, comprise this input value first is interval; And
In described first interval, two way classification at most iteration pre-determined number is utilized to obtain estimation output valve, export described estimation output valve, described input value and described estimation output valve are grey decision-making corresponding to a pairing approximation and brightness value, wherein, described input value and described estimation output valve are the integer be more than or equal to 0.
2. the method for conversion between grey decision-making and brightness value as claimed in claim 1, it is characterised in that gray-scale intensity conversion curve of approximation generates according to following manner:
Gray-scale intensity transformation curve takes N number of point, uses straight line to substitute between consecutive points and obtain gray-scale intensity conversion curve of approximation.
3. the method for conversion between grey decision-making and brightness value as claimed in claim 2, it is characterised in that N is the arbitrary integer in 16 to 64.
4. the method for conversion between grey decision-making and brightness value as claimed in claim 2, it is characterised in that described gray-scale intensity transformation curve includes:
With grey decision-making be abscissa, brightness value be vertical coordinate GTG-brightness transition curve;
With brightness value for abscissa, grey decision-making is the brightness-GTG transformation curve of vertical coordinate,
Accordingly, described gray-scale intensity conversion curve of approximation includes:
GTG-brightness transition curve of approximation, for when described input value is grey decision-making, calculating output estimation brightness value;
Brightness-GTG conversion curve of approximation, for when described input value is brightness value, calculating output estimation grey decision-making.
5. the method for conversion between grey decision-making and brightness value as claimed in claim 4, it is characterised in that the one in the following way takes N number of point on gray-scale intensity transformation curve:
On gray-scale intensity transformation curve, non-equidistance takes N number of point;
N number of point is taken at gray-scale intensity transformation curve non-equidistance in the projection of abscissa; And
N number of point is taken at gray-scale intensity transformation curve non-equidistance in the projection of vertical coordinate.
6. the method for conversion between grey decision-making and brightness value as claimed in claim 4, it is characterised in that by revising the maximum on the vertical scale of described gray-scale intensity transformation curve, the coordinate figure of the N number of point taken is carried out figure place expansion.
7. the method for conversion between grey decision-making and brightness value as claimed in claim 6, it is characterised in that
Described GTG-brightness transition curve obtains according to equation below:
L=(G/Gmax)��*Lmod, wherein,
L represents that brightness value, G represent grey decision-making, GmaxRepresent maximum gray value, LmodRepresenting high-high brightness correction value, �� is parameter;
Described brightness-GTG transformation curve obtains according to equation below:
G=(L/Lmod)(-��)*Gmax, wherein,
L represents that brightness value, G represent grey decision-making, GmaxRepresent maximum gray value, LmodRepresent high-high brightness correction value; �� is parameter.
8. the method for conversion between grey decision-making and brightness value as claimed in claim 7, it is characterised in that �� is the Arbitrary Digit in 2 to 3, LmodIt is 2n, wherein, n is the arbitrary integer in 10 to 15.
9. the method for conversion between grey decision-making and brightness value as described in any one of claim 1 to 8, it is characterised in that in described first interval, utilizes two way classification at most iteration pre-determined number to obtain estimation output valve and includes:
Obtain the beginning and end in described first interval, calculate the midpoint of described beginning and end, and with described midpoint, described first interval is divided into the first subinterval and the second subinterval;
The subinterval that comprises described input value in described first subinterval and described second subinterval is interval as first; And
Repeat the above steps, until the abscissa value at described input value and described starting point, described terminal or described midpoint is equal or pre-determined number described in iteration.
10. the method for conversion between grey decision-making and brightness value as claimed in claim 9, it is characterised in that described pre-determined number is the arbitrary integer in 5 to 10.
11. a method for displaying image, it is characterised in that be applied on the display device with first resolution, including:
According to image to display, obtain the grey decision-making of each sub-pixel on described display device;
Using described grey decision-making as input value, utilize the method for conversion between grey decision-making and brightness value as described in any one of claim 1 to 10, output estimation brightness value;
Carry out sub-pixel according to described estimation brightness value and render output median luminance value;
Using described median luminance value as input value, utilize the method for conversion between grey decision-making and brightness value as described in any one of claim 1 to 10, output estimation grey decision-making;
Showing the image with second resolution according to described estimation grey decision-making, described second resolution is more than described first resolution.
12. a display device, it is characterised in that including:
Display floater, has described first resolution;
Drive circuit, couples with shown display floater, is configured with method as claimed in claim 11 and drives described display floater to show the image with described second resolution.
13. the display device as shown in claim 12, it is characterised in that the coordinate figure of the N number of point taken on described gray-scale intensity transformation curve is stored in described drive circuit in table form.
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