CN110363722A - A kind of tone mapping method for electrowetting electric paper display - Google Patents
A kind of tone mapping method for electrowetting electric paper display Download PDFInfo
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- CN110363722A CN110363722A CN201910634876.4A CN201910634876A CN110363722A CN 110363722 A CN110363722 A CN 110363722A CN 201910634876 A CN201910634876 A CN 201910634876A CN 110363722 A CN110363722 A CN 110363722A
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- 230000001419 dependent effect Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims 2
- 238000009736 wetting Methods 0.000 claims 2
- 230000002547 anomalous effect Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T5/00—Image enhancement or restoration
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
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Abstract
The present invention relates to a kind of tone mapping methods for electrowetting electric paper display, according to the coloration of the electric moistening display of measurement with saturation degree situation of change, realize the tone mapping based on saturation degree, make all initial saturation values all in the range of electric moistening display normally renders, solve the coloration anomalous variation in the high saturation region of coloration saturation curves, improve electrowetting and show picture tone distortion and contouring artifacts, improves image displaying quality.
Description
Technical field
The present invention relates to field of image processing, especially a kind of tone mapping side for electrowetting electric paper display
Method.
Background technique
In recent years, electronic paper display device because its perception effect be similar to paper, low-power consumption, environmental protection the advantages that and by pass
Note.Electrowetting Electronic Paper is equally able to achieve high brightness, high contrast, low energy consumption compared to electrophoretic electronic paper, and in response speed
On be faster than electrophoretic electronic paper, thus become the focus on research direction of electric paper display of new generation.
However, current full color electrowetting electric paper display (EWD) technology is not compared with conventional liquid crystal
Satisfactory colour gamut can be reached.Fig. 1 shows all kinds of colour gamut curves.Snakelike closed curve is CIE1931 coloration profile, including
Physically all colors that can be tested, i.e. desired color gamut curve, reclinate curve are black body color temperature trajectory line, polygon packet
The colour gamut that region is colored electroweting display is enclosed, triangle enclosing region is sRGB colour gamut.It can be found that colored electroweting is aobvious
The Color Range ratio sRGB colour gamut that display screen is presented is small, and especially blue green regions ratio sRGB gamut range is much smaller, so by defeated
The RGB image signal entered is output to when showing on colored electroweting display, and it is poor that display image will necessarily exist with input picture
It is different, it is easy to appear original image tonal distortion and contouring artifacts.
Summary of the invention
In view of this, the purpose of the present invention is to propose to a kind of tone mapping method for electrowetting electric paper display,
Electrowetting can be improved and show picture tone distortion and contouring artifacts, improve image displaying quality.
The present invention is realized using following scheme: a kind of tone mapping method for electrowetting electric paper display, according to
The coloration of the electric moistening display of measurement is realized the tone mapping based on saturation degree, is made all original with saturation degree situation of change
Intensity value all in the range of electric moistening display normally renders, solves the color in the high saturation region of coloration saturation curves
Anomalous variation is spent, improves electrowetting and shows picture tone distortion and contouring artifacts, improve image displaying quality.
Further, specifically includes the following steps:
Colored electroweting display: being placed in a light room of room temperature by step S1, measure the coloration of electric moistening display with
Saturation degree situation of change；
Step S2: input picture rgb value is converted into device-dependent HSB color space, measurement colored electroweting is aobvious
Show the relationship between the perceived color of device and different HSB values；
Step S3: the CIE tristimulus values under different HSB values is obtained, CIEXYZ data are converted to using D65 as white reference
The CIELAB value of point, and calculate corresponding coloration
Step S4: electric moistening display coloration under different B values and H value is obtained by above-mentioned two stepRelative to S
The situation of change of value, and be the similar color saturation Character Comparison of the desired color electrowetting of white reference point to D65 is used, it obtains
It is more than the value to input intensity value, perceived color can change with saturation anomaly；
Step S5: tone mapping is carried out, saturation degree S value is mapped to new value using tone mapping curve；
Step S6: converting back rgb value for new HSB value and input electric moistening display, makes all initial saturation values all
In the range of electric moistening display normally renders.
Further, in step S3, the CIE tristimulus values under different HSB values is obtained using spectroradiometer.
Further, in step S3, corresponding coloration is calculated using following formula
In formula, a*It indicates in CIELAB color space from carmetta to the range of green, b*It indicates in CIELAB color space
From yellow to the range of blue.a*, b*Range from+127 to -128, wherein+127a*Represent carmetta, -128a*It represents green
Color；Similarly ,+127b*It is yellow, -128b*It is blue.
Further, it in step S6, new HSB value is converted back rgb value and inputs electrowetting using Matlab software shows
Show device.
Compared with prior art, the invention has the following beneficial effects: the present invention can improve electrowetting and show picture tone
Distortion and contouring artifacts improve image displaying quality.
Detailed description of the invention
Fig. 1 is that the colored electroweting in background of invention shows gamut map.
Fig. 2 is the flow diagram of the embodiment of the present invention.
Fig. 3 is tone mapping curve (solid line) schematic diagram of the embodiment of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
It is noted that described further below be all exemplary, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As shown in Fig. 2, a kind of tone mapping method for electrowetting electric paper display is present embodiments provided, according to
The coloration of the electric moistening display of measurement is realized the tone mapping based on saturation degree, is made all original with saturation degree situation of change
Intensity value is all in the range of electric moistening display normally renders.
In the present embodiment, specifically includes the following steps:
Colored electroweting display: being placed in a light room of room temperature by step S1, measure the coloration of electric moistening display with
Saturation degree situation of change；
Step S2: input picture rgb value is converted into device-dependent HSB (form and aspect, saturation degree and brightness) color sky
Between, measure the relationship between the perceived color and different HSB values of colored electroweting display (EWD)；
Step S3: obtaining the CIE tristimulus values (XYZ) under different HSB values, and it is white that CIEXYZ data, which are converted to D65,
The CIELAB value of color reference point, and calculate corresponding coloration
Step S4: electric moistening display color under different B (brightness) value and H (form and aspect) value is obtained by above-mentioned two step
DegreeIt is the phase of the desired color electrowetting of white reference point relative to the situation of change of S (saturation degree) value, and with D65 is used
Like color saturation Character Comparison, input intensity value is obtained, is more than the value, perceived color can change with saturation anomaly；At this
In define " turning point " of three kinds of colors of red, green, blue, i.e. colorationStart corresponding when anomalous variation (including increase and decline)
S value, be expressed as SthR, SthG、SthB；
Step S5: tone mapping is carried out, saturation degree S value is mapped to new value using tone mapping curve；
Step S6: converting back rgb value for new HSB value and input electric moistening display, makes all initial saturation values all
In the range of electric moistening display normally renders.
Preferably, colored electroweting display to be placed in a light room of room temperature in step S1, spectroradiometer aims at aobvious
Show device center, and away from display center 0.5m.Wherein the illumination of light room is set as standard sources D65, and the illumination on display is set
It is set to 1240lux.In addition, replacing spectroradiometer, shooting display image with camera to obtain displayed image.
Preferably, input picture rgb value is converted to device-dependent HSB color space by step S2, technicolo is measured
Soak the relationship between the perceived color and different HSB values of display (EWD).Three kinds of colors are measured, form and aspect H value is H
=0 ° (red), H=120 ° (green), H=240 ° (blue)；Saturation degree S value is from 0.1 to 1, step-length 0.1, totally 10 step；Base
In 4 gray scales, brightness B value is divided into 16 steps (0,1,2 ..., 15).Using the various combination measurement of 480 kinds of HSB values, i.e. S value
10 steps, 16 step of B value, 3 step of H value.
In the present embodiment, in step S3, the CIE tristimulus values under different HSB values is obtained using spectroradiometer.
In the present embodiment, in step S3, corresponding coloration is calculated using following formula
In formula, a*It indicates in CIELAB color space from carmetta to the range of green, b*It indicates in CIELAB color space
From yellow to the range of blue.a*, b*Range from+127 to -128, wherein+127a*Represent carmetta, -128a*It represents green
Color；Similarly ,+127b*It is yellow, -128b*It is blue.
Preferably, step S5 specifically: utilize formulaBy initial saturation from
0 to 1 distribution map is 0 to SthXRange, wherein X can be R (red), G (green), B (blue), that is, three primary colours
Turning point.As shown in Figure 3.Find formulaWith S '=S intersection point, and keep
Initial saturation on the left of the intersection point.Tone mapping curve is formed by keeping and mapping two parts.It determinesAn exponent gamma appropriateX。γXValue close to 0 will make tone mapping section too
It is flat, tone can be caused to be truncated；In contrast, γXValue will lead to tone close to 1 and keep too small with the transposition section of mapped segments, lead
Cause moderate even low saturation.Therefore, γXEnd value be 0.45, the shape of curve is as shown in figure 3 by the solid lines.
In the present embodiment, in step S6, new HSB value is converted back into rgb value with Matlab software and inputs EWD, is made
New coloration saturation degree of all initial saturation values all in the range of electric moistening display normally renders, after obtaining tone mapping
Characteristic pattern solves the coloration anomalous variation in the high saturation region of coloration saturation curves.
Preferably, a series of illumination of the settable possibility usage scenarios (display) that can be covered of the present embodiment comprehensively.
For certain light source, measure under different B (brightness) value and H (form and aspect) valueRelative to the situation of change of S (saturation degree) value,
And corresponding tone mapping curve is exported according to the coloration saturated characteristic of measurement.By being repeated to the light source of all preparations
Step is stated, different tone mapping curves can be generated and is stored as database.In this way, when EWD is under circumstances not known light
When work, a simple color temperature sensor obtains environment colour temperature, and corresponding tone mapping curve is then loaded from database,
Use what is proposed to improve picture quality based on the tone mapping method of saturation degree.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (5)
1. a kind of tone mapping method for electrowetting electric paper display, which is characterized in that aobvious according to the electrowetting of measurement
Show that the coloration of device with saturation degree situation of change, realizes the tone mapping based on saturation degree, makes all initial saturation values all in electricity
In the range of wetting display normally renders.
2. a kind of tone mapping method for electrowetting electric paper display according to claim 1, which is characterized in that
Specifically includes the following steps:
Step S1: colored electroweting display is placed in a light room of room temperature, measures the coloration of electric moistening display with saturation
Spend situation of change；
Step S2: input picture rgb value is converted into device-dependent HSB color space, measures colored electroweting display
Perceived color and different HSB values between relationship；
Step S3: obtaining the CIE tristimulus values under different HSB values, and CIEXYZ data are converted to using D65 as white reference point
CIELAB value, and calculate corresponding coloration
Step S4: electric moistening display coloration under different B values and H value is obtained by above-mentioned two stepRelative to S value
Situation of change, and be the similar color saturation Character Comparison of the desired color electrowetting of white reference point to D65 is used, it obtains defeated
Enter intensity value, be more than the value, perceived color can change with saturation anomaly；
Step S5: tone mapping is carried out, saturation degree S value is mapped to new value using tone mapping curve；
Step S6: converting back rgb value for new HSB value and input electric moistening display, makes all initial saturation values all in electricity
In the range of wetting display normally renders.
3. a kind of tone mapping method for electrowetting electric paper display according to claim 2, which is characterized in that
In step S3, the CIE tristimulus values under different HSB values is obtained using spectroradiometer.
4. a kind of tone mapping method for electrowetting electric paper display according to claim 2, which is characterized in that
In step S3, corresponding coloration is calculated using following formula
In formula, a*It indicates in CIELAB color space from carmetta to the range of green, b*It indicates in CIELAB color space from Huang
Color to blue range.
5. a kind of tone mapping method for electrowetting electric paper display according to claim 2, which is characterized in that
In step S6, new HSB value is converted back by rgb value using Matlab software and inputs electric moistening display.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114898716A (en) * | 2022-05-12 | 2022-08-12 | 福州大学 | Method for high-gray-scale electrowetting display device based on cooperation of voltage modulation and time modulation |
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