CN110910841A - System and method for reducing ghost image of electrophoretic electronic paper - Google Patents
System and method for reducing ghost image of electrophoretic electronic paper Download PDFInfo
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- CN110910841A CN110910841A CN201911294868.6A CN201911294868A CN110910841A CN 110910841 A CN110910841 A CN 110910841A CN 201911294868 A CN201911294868 A CN 201911294868A CN 110910841 A CN110910841 A CN 110910841A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 238000007781 pre-processing Methods 0.000 claims abstract description 7
- 230000009466 transformation Effects 0.000 claims description 24
- 238000001962 electrophoresis Methods 0.000 claims description 5
- 238000009499 grossing Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000007797 corrosion Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000003313 weakening effect Effects 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract 1
- 238000009966 trimming Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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Abstract
The invention discloses a ghost weakening system and a ghost weakening method of electrophoretic electronic paper, wherein the ghost weakening system of the electrophoretic electronic paper comprises a main control module, a camera module, a display module, a storage module, a driving module and a PC (personal computer) end; the method for weakening the ghost shadow system comprises the steps that an image of an electronic paper display screen is shot by a camera module and stored in a storage module, image preprocessing including first gray level conversion, histogram equalization, second gray level conversion, binarization and median filtering is carried out on the image through a PC (personal computer) end, then edge extraction is carried out on the image, an area with characters is cut out, character recognition is carried out, finally the recognized characters are reversely driven once through a driving module, and the ghost shadow phenomenon is weakened. The invention achieves the effect of weakening the ghost by identifying the character of the image ghost and reversely driving the character by the driving module for one time, thereby greatly improving the reading experience of a user.
Description
Technical Field
The invention relates to the technical field of image character recognition, in particular to an electrophoresis electronic paper ghost attenuation system and an attenuation method.
Background
The electrophoretic electronic paper has the characteristics of ultralow power consumption, thinness, flexibility and the like, is widely applied to display products such as an electrophoretic electronic book reader, an electrophoretic electronic tag, an electrophoretic electronic billboard and the like, but when the electronic paper products are refreshed, a ghost image of a previous image appears, and the reading experience of a user is greatly influenced by the ghost image phenomenon; at present, no more perfect method for reducing the ghost phenomenon of the electronic paper exists, so a system and a method for reducing the ghost are needed to be designed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an electrophoretic electronic paper ghost reducing system and a reducing method.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides an electrophoresis electron paper ghost weakens system, includes display screen module, camera module, drive module, storage module, host system and PC end, display screen module, camera module, drive module, storage module all with the host system electricity is connected, the PC end pass through the internet with the host system communication is connected.
The main control module is a microprocessor.
The storage module is an SD storage card.
The camera module is a camera.
The invention also provides a weakening method of the electrophoresis electronic paper ghost weakening system, which comprises the following steps:
and step S1, shooting the electronic paper display screen by the camera module, and storing the picture in the storage module.
And step S2, reading the image stored in the storage module through the PC terminal, and converting the image into a gray image.
Step S3, preprocessing the grayscale image.
And step S4, performing edge extraction, image corrosion, smoothing and expansion processing on the image preprocessed in the step S3, and cutting redundant areas to leave character areas.
Step S5, character recognition is performed on the image processed in step S4.
Step S6, the characters of the ghost recognized in step S5 are driven in reverse.
Further, in step S3, the pre-processing of the image includes: carrying out first gray level transformation and gray level transformation on the image, then carrying out histogram equalization, second gray level transformation and binarization processing on the image, and finally filtering out noise by using median filtering; wherein, the gray scale transformation formula is as follows:
wherein the gray scale value range of the input image is [ fmin，fmax]。
The gray scale value range of the output image is [ g ]min，gmax]。
Further, in step S3, the first gray scale conversion value range satisfies a vicinity of the histogram of the gray scale image where the number of pixels is the minimum, and is also at a non-pixel point.
Furthermore, the value range of the second gray level transformation is determined according to the histogram of the histogram equalized image after the first gray level transformation, and the range meets the condition that the number of pixel points in the histogram is near the minimum, and the pixel points are not needed.
Further, in step S4, the threshold of the redundant region is referred to according to the histogram of the image after step S3, and the value range is taken from the pixels with less distribution of the pixels.
Further, in step S5, the width and height of the top, the bottom, the left boundary, and the right boundary of the character are obtained first, then the character is cut, the cut character is compared with a character template prepared in advance by pixel points, and the similarity is greater than a preset threshold value, so that the recognition can be performed, wherein the calculation formula of the similarity is as follows:
wherein S is the similarity.
M＝40。
N＝20。
T is the pixel value of the character template.
I refers to the ith character.
X denotes a pixel value of a character to be recognized after being cut.
The invention has the beneficial effects that: the invention provides a system and a method for weakening ghosting, which are simple and convenient to operate, can effectively weaken the phenomenon of ghosting, and greatly improve the experience of users of electronic paper products.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a block diagram of an electrophoretic electronic paper ghosting reduction system of the present invention;
FIG. 2 is a flow chart of a method for reducing ghosting in the electrophoretic electronic paper reduction system of the present invention;
FIG. 3 is a ghost artwork;
FIG. 4 is a grayscale image of a ghosted original;
FIG. 5 is the image of FIG. 4 after a first transformation;
FIG. 6 is the image of FIG. 5 after histogram equalization;
FIG. 7 is the image of FIG. 6 after a second gray scale transformation;
FIG. 8 is a binarized image of the image of FIG. 7;
FIG. 9 is a median filtered image of the image of FIG. 8;
FIG. 10 is an image of the image of FIG. 9 after edge extraction;
FIG. 11 is the image of FIG. 10 after redundancy cropping;
fig. 12 is the font identified from fig. 11.
Detailed Description
Referring to fig. 1, the electrophoresis electronic paper ghost reducing system comprises a display screen module, a camera module, a driving module, a storage module, a main control module and a PC terminal, wherein the display screen module, the camera module, the driving module and the storage module are all electrically connected with the main control module, and the PC terminal is in communication connection with the main control module through the internet; the main control module is a microprocessor; the storage module is an SD storage card; the camera module is a camera.
Referring to fig. 2 to 12, the present invention further provides a method for reducing ghosting in an electrophoretic electronic paper reduction system, including the following steps:
step S1, shooting the electronic paper display screen by the camera module, and storing the picture in the storage module, wherein the camera module needs to adjust the angle, and the shot image needs to have uniform brightness; the mean and variance of the gray level map are calculated to evaluate whether the brightness of the image is uniform, and the image is the original image of the ghost captured in the present embodiment with reference to fig. 3.
Step S2, reading the image stored in the storage module through the PC, selecting an image with uniform brightness, converting the image into a grayscale image, and converting the grayscale image into a grayscale image, referring to fig. 4, which is the grayscale image of the ghost original image captured in step S1.
Step S3, performing image preprocessing on the grayscale image, specifically, the image preprocessing includes: carrying out first gray level transformation and gray level transformation on the image, then carrying out histogram equalization, second gray level transformation and binarization processing on the image, and finally filtering out noise by using median filtering; wherein, the gray scale transformation formula is as follows:
wherein the gray scale value range of the input image is [ fmin，fmax]。
The gray scale value range of the output image is [ g ]min，gmax]。
Further, in step S3, the first gray scale transformation value range satisfies the vicinity of the minimum number of pixels in the histogram of the gray scale image, and is also at a non-pixel point; the value range of the second gray scale transformation is determined according to the histogram of the histogram equalized image after the first gray scale transformation, and the range satisfies the vicinity of the minimum number of the pixel points in the histogram, and also needs to be at the pixel-free point, which can be specifically referred to fig. 5 to 9, and is an image corresponding to the gray scale image in step S2 after the first gray scale transformation, the histogram equalization, the second gray scale transformation, binarization and median filtering in sequence.
Step S4, performing edge extraction, image erosion, smoothing, and expansion processing on the image preprocessed in step S3, and trimming redundant regions to leave text regions, in this embodiment, the edge extraction of the image is to extract text regions by using a Roberts operator detection method in edge detection, the image erosion, smoothing, and expansion processing are prior art, and are not described herein again, the threshold of redundant trimming regions is referred to according to the histogram of the image after step S3, and the value range is taken from pixels less than the distribution of pixels, refer to fig. 10 and fig. 11, which are the image processed in step S3, and the image after edge extraction and redundant trimming is performed in sequence.
Step S5, performing character recognition on the image processed in step S4, specifically, in this step, obtaining the widths and heights of the top, bottom, left boundary and right boundary of the character, then performing character cutting, comparing the cut character with a character template prepared in advance, and recognizing if the similarity is greater than a preset threshold, wherein the calculation formula of the similarity is as follows:
wherein S is the similarity.
M＝40。
N＝20。
T is a pixel value (pixel matrix) of the character template.
I refers to the ith character.
X denotes a pixel value (pixel matrix) of the character to be recognized after cutting; referring to fig. 12, the font identified from the image of step S4.
Step S6, reversely driving the character of the ghost image identified in the step S5 through a driving module; specifically, because the font of the ghost character is identified, the specific pixel point where the ghost is located can be known, the ghost phenomenon can be effectively weakened by applying the voltage opposite to the original voltage to the pixel point, and the experience of the user of the electronic paper product is greatly improved.
The above embodiments do not limit the scope of the present invention, and those skilled in the art can make equivalent modifications and variations without departing from the overall concept of the present invention.
Claims (10)
1. The utility model provides an electrophoresis electron paper ghost weakens system which characterized in that it includes display screen module, camera module, drive module, storage module, host system and PC end, display screen module, camera module, drive module, storage module all with the host system electricity is connected, the PC end through the internet with the host system communication is connected.
2. The electrophoretic electronic paper ghosting reduction system of claim 1, wherein the main control module is a microprocessor.
3. The electrophoretic electronic paper ghosting reduction system of claim 1, wherein the storage module is an SD memory card.
4. The electrophoretic electronic paper ghosting reduction system of claim 1, wherein the camera module is a camera.
5. The method for reducing ghosting in the electrophoretic electronic paper according to claim 1, comprising the steps of:
step S1, shooting the electronic paper display screen by the camera module, and storing the picture in the storage module;
step S2, reading the image stored in the storage module through the PC terminal, and converting the image into a gray image;
step S3, preprocessing the gray level image;
step S4, performing edge extraction, image corrosion, smoothing and expansion processing on the image preprocessed in the step S3, and cutting redundant areas to leave character areas;
step S5, recognizing characters of the image processed in the step S4;
step S6, the characters of the ghost recognized in step S5 are driven in reverse.
6. The method for reducing the ghosting reduction system of the electrophoretic electronic paper as claimed in claim 5, wherein the preprocessing of the image in the step S3 includes: carrying out first gray level transformation and gray level transformation on the image, then carrying out histogram equalization, second gray level transformation and binarization processing on the image, and finally filtering out noise by using median filtering; wherein, the gray scale transformation formula is as follows:
g（x,y）=
（
-
）+
；
wherein the gray scale value range of the input image is [ [ alpha ] ]
]；
The gray scale value range of the output image is
；
f(x, y) is a pixel value of a point (x, y) on a two-dimensional coordinate axis composed of the image itself.
7. The method for reducing the ghosting reduction of the electrophoretic electronic paper as claimed in claim 6, wherein in the step S3, the first time gray scale transformation value range satisfies a condition near a minimum number of pixels in a histogram of the gray scale image, and is also at a non-pixel point.
8. The method of claim 6, wherein the range of values for the second gray scale transformation is determined according to the histogram of the histogram equalized image after the first gray scale transformation, and the range is satisfied near the histogram where the number of pixels is the smallest and is also at a non-pixel point.
9. The method of claim 5, wherein in step S4, the threshold of the redundant regions is referenced according to the histogram of the image after step S3, and the value range is taken from pixels with less distribution of pixels.
10. The method for reducing the ghosting reduction system of the electrophoretic electronic paper as claimed in claim 5, wherein in the step S5, the widths and heights of the top, the bottom, the left boundary and the right boundary of the character are obtained first, then the character is cut, the cut character is compared with a character template prepared in advance for pixel point comparison, and the similarity is greater than a self-set threshold value for identification, wherein the calculation formula of the similarity is as follows:
wherein S is similarity;
M=40；
N=20；
t is a pixel point of the character template;
i refers to the ith character;
and X refers to the pixel point of the cut character to be recognized.
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