CN111627399A

CN111627399A - Method, terminal and computer readable storage medium capable of locally transforming display colors

Info

Publication number: CN111627399A
Application number: CN202010550589.8A
Authority: CN
Inventors: 程超; 成湘均
Original assignee: Ireader Technology Co Ltd; Zhangyue Technology Co Ltd
Current assignee: Ireader Technology Co Ltd; Zhangyue Technology Co Ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-09-04

Abstract

The invention discloses a method capable of locally changing display colors, a reading terminal and a computer readable storage medium. The reading terminal comprises an ink screen and a processor, wherein a color filter film is arranged on the ink screen, so that the ink screen is compatible with a non-color mode and a color mode, and the processor is used for responding to a touch instruction to display a local range in a gray scale picture or a color picture. When the local range is displayed by a gray scale picture, the rest part of the image to be displayed is displayed by a color picture; when the local area is displayed in a color picture, the rest of the image to be displayed is displayed in a gray picture.

Description

Method, terminal and computer readable storage medium capable of locally transforming display colors

Technical Field

The present invention relates generally to the field of displays. More particularly, the present invention relates to a method for locally transforming display colors of a display page, a reading terminal and a computer readable storage medium.

Background

With the popularization of reading atmosphere, a reading terminal equipped with an electronic ink screen is just a necessary accessory for most people. Gradually, the reading terminal loads text books that are no longer just black or white, and more picture contents need to be displayed. With the breakthrough of technology, reading terminals with color display function appear in succession. At present, a layer of color filter film is superimposed on a conventional black-and-white ink screen, different colors (R, G or B) are printed at different positions on the filter film, the ink screen displays according to 16-step gray scale, and light rays irradiated on the ink screen reflect out through the color filter film, so that a color effect can be displayed. Wherein, 16 gradations displayed by the ink screen are matched with the colors at the corresponding positions on the color filter film, so that 16 shades of RGB three primary colors can be expressed respectively, and the printing type ink screen can provide 16 × 16 and 4096 colors.

Although the ink screen is displayed according to 16-step gray scale, the process of converting the gray scale image in the color image is different from that of the conventional black-and-white ink screen in order to match the colors at different positions on the color filter film. Specifically, the corresponding color component is extracted according to the color of the corresponding position on the color filter film, and only the color component is retained, and then the gray scale processing is performed, whereas the conventional black-and-white ink screen performs the gray scale calculation according to the three color components of RGB of the pixel point.

As can be seen from the above description, although the reading terminal can display a color image through the printed color electronic paper, the function of displaying a gray scale image is lost. In the prior art, an image is subjected to gray scale processing in a whole frame mode, and the processed displayed image is either full-frame color or full-frame black-and-white gray scale, so that partial color or partial gray scale display cannot be performed on one image. If it is desired to realize that both gray scale and color display effects can be achieved on the same reading terminal, then two requirements need to be met: 1. a color display mode; 2. and performing original image modification on a part needing to be subjected to gray scale display in the original color image, and changing the RGB values of pixels of the original color image. However, in order to achieve the effect of partial color, the original image needs to be modified and designed on a system level, which is too high in cost and poor in adaptability.

Disclosure of Invention

To at least partially solve the technical problems mentioned in the background, an aspect of the present invention provides a method, a reading terminal and a computer-readable storage medium for partially transforming display colors.

In one aspect, a reading terminal capable of locally changing display colors includes: the device comprises an ink screen, a color filter film, a touch screen and a processor. The ink screen is used for displaying an image to be displayed; the color filter film is arranged on the ink screen and is provided with a plurality of pixel units, wherein each pixel unit comprises red, green and blue pixels and is used for displaying the color of the image to be displayed; the touch screen is used for selecting the information of the local range in the image to be displayed according to the setting; the processor is used for displaying the local range in a gray scale picture or a color picture. When the local range is displayed by the gray scale picture, the rest part of the image to be displayed is displayed by the color picture; and when the local range is displayed by the color picture, the rest part of the image to be displayed is displayed by the gray picture.

In another aspect, a method of switchable display colors for an ink screen reading terminal, comprising: receiving an image to be displayed; selecting a local range in the image to be displayed according to setting; judging that the local range is displayed by a gray scale picture or a color picture; if the local range is displayed by the gray scale picture, displaying the local range by the gray scale picture; displaying the rest part of the image to be displayed in the color picture; if the local area is displayed in the color picture, then: displaying the local range in the color picture; and displaying the rest part of the image to be displayed by the gray scale picture.

In yet another aspect, the present invention discloses a computer readable storage medium having stored thereon a computer program code for changeable display colors, which when executed by a processor, performs the aforementioned method.

The reading terminal can be compatible with a non-color mode and a color mode, so that the reading terminal can locally display a gray picture or a color picture.

The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 is a schematic diagram illustrating a reading terminal of an embodiment of the present invention;

FIG. 2 is a schematic diagram showing an original color image of RGB 888;

FIG. 3 is a block diagram illustrating a color filter in combination with an ink screen according to an embodiment of the present invention;

FIG. 4 is a pixel diagram showing a color filter according to an embodiment of the present invention;

FIGS. 5(a) through (c) are diagrams illustrating a reading terminal that can locally transform display colors according to an embodiment of the present invention; and

fig. 6 is a flowchart illustrating a method of partially transformable display colors according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be understood that the terms "first", "second", "third" and "fourth", etc. in the claims, the description and the drawings of the present invention are used for distinguishing different objects and are not used for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and claims of this application, the singular form of "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this specification refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

As used in this specification and claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection".

The following detailed description of embodiments of the invention refers to the accompanying drawings.

One embodiment of the invention is a system capable of changing a display mode, which is used for locally changing display colors of a page of a reading terminal. The reading terminal has a structure as shown in fig. 1.

As shown in fig. 1, the reading terminal 100 includes: a processor 101, a communication interface 102, a power component 103, a display 104, an audio component 105, a memory 106, and a key interface 107.

The processor 101 may be a central processing unit CPU or a specific integrated circuit ASIC or an integrated circuit configured to implement an embodiment of the invention. Furthermore, the reading terminal 100 can include multiple processors, which can be of the same type or different types of processors, such as multiple CPUs, multiple ASICs, or a CPU plus an ASIC.

The communication interface 102 is configured as a module for wireless communication between the reading terminal 100 and other devices, including bluetooth 112,

WiFi antenna

122, 4G/5G antenna communication 132, and the like. In another embodiment, the communication interface 102 further includes a Near Field Communication (NFC) module to facilitate short-range communications.

The power supply component 103 provides power to the various components of the reading terminal 100. The power supply assembly 103 may include an external power interface 113 and a charging interface circuit 123.

The display 104 is an interactive display interface between the reading terminal 100 and the user, and includes an electromagnetic film 114, a capacitive screen 124, an ink screen 134, and the like.

The electromagnetic film 114 is used for receiving signals of an electromagnetic pen, and is distinguished by magnetic field changes generated by inductors under an electromagnetic pen operating process and a panel, the electromagnetic pen is a signal transmitting end, the electromagnetic film 114 is a signal receiving end, magnetic flux changes when the electromagnetic pen is close to induction, and position points are defined through operation.

The capacitive screen 124 is a touch screen for receiving signals from a user's finger input and includes one or more touch sensors to detect gestures on the touch, slide and touch screen panels. The touch sensor may detect not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation.

The electromagnetic film 114 and the capacitive screen 124 are collectively referred to as a touch screen 174.

The ink screen 134 is a display screen using electronic ink, also called electronic paper display technology, and has a main structure including a top transparent electrode layer, an electrophoretic layer, and a bottom electrode pixel layer. The electrophoretic layer is internally provided with a plurality of fine microcapsules, the microcapsules are provided with transparent liquid and a plurality of tiny electrophoretic particles, the electrophoretic particles are distributed in the transparent electrophoretic liquid to form a suspension system, the surfaces of the electrophoretic particles are easy to adsorb electric charges, and the particles capable of inducing the electric charges can move under the action of an external electric field.

Specifically, the electrophoretic particles are classified into negatively charged black particles and positively charged white particles. When a positive voltage is applied to the bottom electrode pixel layer, the white particles are repelled to move toward the top transparent electrode layer, and the black particles are attracted to move toward the bottom electrode pixel layer, in which case the pixel appears white. Conversely, when a negative voltage is applied to the bottom electrode pixel layer, the white particles are attracted to move toward the bottom electrode pixel layer, the black particles are repelled to move toward the top transparent electrode layer, and the pixel is displayed as black.

A color filter 136 is superimposed on the ink panel 134, and displays a desired color by additive color mixing by controlling the intensity of reflected light of three primary colors, red (R), green (G), and blue (B). The color filter 136 absorbs other color components by polarization effects, for example, when natural light is irradiated on a red portion of the color filter 136, it absorbs a blue-green component, only a red component is transmitted therethrough, and thus the human eye sees red. The color filter 136 can be printed directly on the ink screen or adhered to the ink screen in a membrane form, and the basic structure of the membrane form color filter includes a filter glass substrate, and each pixel on the filter glass substrate has a color light blocking layer with three primary colors of red, green, and blue. Specifically, the black particles of the ink panel 134 absorb light, and conversely, the white particles reflect light, so that if a red color is to be displayed, the electrode at the red position is charged with positive electricity to attract the black particles downward, and the white particles move toward the top transparent electrode layer, the light reflected by the white particles will display red color through the pixel at the red position corresponding to the color filter 136, and the voltage of the electrode is controlled to control the ratio of the white particles to the black particles on the top transparent electrode layer, thereby controlling the gray scale (brightness) of the pixel and indirectly controlling the shade of the red color. In summary, the movement of the black particles and the white particles in the red, green and blue microcapsules is controlled to control the gray level of the microcapsules, and the color filters 136 are used to display the red, green and blue colors with different shades for color mixing, thereby displaying the color of the specific pixel.

The display 104 also includes a sensing component 144 configured with a plurality of various sensors for providing various aspects of status assessment for the electronic device. For example: the temperature sensor 154 in the sensing element 144 can detect the temperature change of the display 104, and the detected temperature is transmitted to the processor 101 and then to the timing controller 108 as a parameter for table lookup.

The display 104 further includes a front light and light guide plate 164 disposed at a side of the display 104 to provide a stable and uniform light source.

The audio component 105 is configured to output and/or input audio signals. For example, the audio component 105 includes a microphone 118, and when the reading terminal 100 needs to receive speech, such as a call mode, a recording mode, and a speech recognition mode, the microphone 118 is configured to receive external audio signals. The audio module 105 further comprises a speaker 128 for outputting audio signals.

The memory 106 is used for storing programs, electronic books and notes, and may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as a disk memory.

The key interface 107 is used for controlling the page turning of the user, and is generally physical keys, which are disposed at the side of the reading terminal 100 and include a front page turning key and a back page turning key.

The timing controller 108 is used for finding out the corresponding control parameter, i.e. the driving waveform, through the lookup table. Since the black and white particles in the ink screen 134 are sensitive to temperature, the lower the temperature, the less active the particles, the longer it takes to move to the same position in the microcapsule at room temperature; the particles move faster when the temperature is higher, and the time required to move to the same location in the microcapsule is relatively shorter compared to the time required at normal temperature. The temperature sensor 154 collects temperature data on the display 104, and the timing controller 108 finds corresponding control parameters according to the temperature data to select an appropriate driving waveform.

The timing controller 108 may be implemented by means of an algorithm, i.e., a software timing controller, instead of being implemented by hardware. The software timing controller is an algorithm integrated on a System-on-a-Chip (hereinafter referred to as an SOC Chip).

The display driver 109 converts the driving waveform into a control signal to drive the ink particles on the ink screen 134 to move, so that image data to be displayed can be imaged on the ink screen 134.

The pixel mapping relationship between the ink panel 134 and the color filter 136 is further described below with reference to fig. 2 to 4. Fig. 2 shows a schematic diagram of pixels of an image to be displayed, the image to be displayed is formed by combining colors of pixels, a data structure of the pixels is RGB888, which represents that 8 bytes are used to record a red color value, a green color value and a blue color value respectively, and a value of each color value ranges from 0 to 255. More specifically, the color of one pixel unit 21 of the image to be displayed is formed by mixing three primary colors of RGB emitted by the pixel unit, each pixel has three color components of red, green and blue, and each pixel has a corresponding color value of RGB888, wherein the component refers to an intensity value of each color within a range of 0 to 255.

Fig. 3 is a schematic diagram illustrating a structure of the color filter 136 combined with the ink panel 134 according to an embodiment of the invention, as shown in fig. 3, the color filter 136 is superimposed on the ink panel 134, and one pixel unit 310 is used as a basic unit to express three primary colors, and three adjacent pixels (e.g.,

pixels

321, 322, 323) in the ink panel 134 correspond to the pixel unit 310 of the color filter 136, wherein the

pixels

321, 322, 323 respectively generate three color components of red, green and blue.

Fig. 4 shows a schematic diagram of implementing colors by using a color filter 136 according to an embodiment of the present invention, wherein different colors such as RGB are printed on the color filter 136. In practical applications, the RGB arrangement may also be irregular to make the color expression more natural, such as RBG RGB BRGBGR, and the order is predetermined when the color filter 136 is manufactured.

In some implementations, each pixel in the image to be displayed has three color components of RGB, but the position of the color filter 136 corresponding to the pixel can only print one color, and thus the three color components cannot be displayed on the color filter 136 for a single pixel. For the above reasons, this embodiment uses three pixels on the color filter 136 as one pixel unit 310, and sequentially prints three primary colors of RGB. For example, in pixel unit 310, processor 101 uses the red color printed on the first pixel 411 to represent the red color component of ink screen pixel 321 (shown in FIG. 3), and uses the green color printed on the second pixel 412 to represent the green color component of ink screen pixel 322; the blue color printed on the third pixel 413 is used to express the blue color component of the ink screen pixel 323.

Since three pixels on the ink screen 134 are mapped to one pixel unit on the color filter 136, the DPI of the color filter 136 is reduced to one third, and the DPI of the black and white ink screen 134 is generally 300, which becomes 100 after combining the color filter 136.

In more detail, the processor 101 retains the corresponding color component value of the RGB values of the pixel according to the color printed at the corresponding position on the color filter 136, and discards the rest of the color component values. The first pixel 411 of the color filter 136 is printed with red color, which is only used to express the red component of the pixel 321 of the ink panel 134, so that the green component and the blue component are not retained; similarly, the second pixel 412 of the color filter 136 is printed with green color, which is used to express only the green color component of the pixel 322 of the ink screen 134, and the red and blue color components are not retained, and so on.

The processor 101 then converts the remaining color component values into a gray scale value of 16 gray. Because different gray scales have different light and shade effects, the gray scale of a single primary color can be displayed through the color filter film. Taking red as an example, the gray scale can be controlled to show deep red, date red, bright red, light red, pink, etc. For one pixel unit, different color effects can be realized by controlling the combination of the gray levels of the three primary colors. In this embodiment, there are 16 shades of each primary color component of RGB, and the number of colors that can be realized by one pixel unit is 16 × 16 for 4096 colors.

Finally, the processor 101 controls the display driver 109 to drive the display of the ink screen 134. The ink screen displays the gray scale of red, green and blue pixels, and the color is mixed by the color filter film 136 to present an original color picture.

An application scenario of this embodiment is shown in fig. 5(a) to (c), which are schematic diagrams of a reading terminal capable of partially changing display colors. The ink screen 134 displays an image 510 to be displayed, the color filter 136 is used for displaying colors of the image 510 to be displayed, and the touch screen 174 selects information of a local range 520 in the image 510 to be displayed according to a setting, for example: the image to be displayed 510 is an animal facial makeup, and the selected local range 520 may be a specific region of the animal facial makeup. The reading terminal 100 has a non-color mode or a color mode, and the processor 101 can correspondingly display the local area 520 in a gray scale image or a color image according to the non-color mode or the color mode; when in the color mode, the local area 520 is displayed as a gray scale image, and the rest of the image to be displayed 510 is displayed as a color image; when in the non-color mode, the local area 520 is displayed as a color frame, and the rest of the image to be displayed 510 is displayed as the gray frame.

Specifically, the processor 101 performs gray scale conversion for displaying either a gray scale screen or a color screen. For convenience of illustration, the reading terminal 100 of this embodiment is preset in the non-color mode (or preset in the color mode, where there is no sequential limitation), and performs the gray scale conversion mode for the gray scale image display. The processor 101 performs a gray scale calculation on the image to be displayed 510 to convert it into the first gray scale image (in this mode, the color component values of each pixel do not need to be discarded). In more detail, the processor 101 calculates a gray value using three color values of RGB of each pixel, and converts the image to be displayed into 8-bit gray data. The calculation mode can be any one of the following modes:

1. floating point method: gray ═ R0.3 + G0.59 + B0.11;

2. integer method: gray ═ (R30 + G59 + B11)/100;

3. a shift method: gray ═ (R77 + G151 + B28) > > 8;

4. average value method: gray ═ R + G + B)/3.

The converted gray value is 8 bits, that is, the gray value range is 0 to 255, and there are 256 different gray levels. Through a preset mapping relationship, the processor 101 converts the gray value of the pixel into a certain one of 16 gray levels, the 16 gray levels take values from 0 to 15, wherein 0 is pure white, 15 is pure black, and the middle values are gray at different depths. After the conversion is completed, gradation data is recorded using 4-bit data.

In more detail, the mapping relationship between 256 gray scales and 16 gray scales in this embodiment is: 0 to 16 of the 256 shades of gray correspond to 0 of 16 shades of gray, 17 to 32 of the 256 shades of gray correspond to 1 of 16 shades of gray, 33 to 48 of the 256 shades of gray correspond to 2 of 16 shades of gray, and so on. The conversion can also be performed by using a non-linear mapping relationship, and each gray scale in the 16 gray scale image is preset to correspond to a gray scale range in 256 gray scales.

In other words, the processor 101 can convert the gray-scale picture display range, which is the entirety of the image to be displayed 510, into the first gray-scale image through the above algorithm.

And then, carrying out gray level conversion on the whole frame of the original image by using a gray level conversion mode in a color mode to obtain a second gray level image. The processor 101 performs a quantization process on the image to be displayed 510 to discard and retain a component value of one of the red, green and blue pixels, and then converts the formed image into a second gray image. The purpose of converting into the gray scale image is to be capable of adapting to the display of the ink screen 134 and the color filter 136, and in detail, the color expression of the image to be displayed is realized by the color filter 136, and the ink screen 134 itself still follows the display mechanism of black and white particles, that is, the ink screen 134 itself cannot directly display the color image, but affects the display effect of the color filter 136 by the depth of the gray scale, so as to realize various colors.

When the quantization processing is performed, the processor 101 reserves a component value of one of the red, green and blue pixels on the color filter 136 corresponding to a pixel of the image to be displayed, performs gray scale conversion on the image to be displayed according to the component value to 8-bit gray scale data, and converts the 8-bit gray scale data to 4-bit gray scale data.

In other words, the processor 101 can convert the grayscale picture display range, which is the entirety of the image to be displayed 510 as well, into the second grayscale image through the above-described component processing.

In one implementation scenario, the ink screen 134 of this embodiment may display a toggle key 530. It will be understood by those skilled in the art that the present invention is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings.

As shown in fig. 5(a), in the non-color mode, the image to be displayed 510 displays a first gray scale image, i.e., a gray scale picture, and for convenience of description, the image to be displayed 510 only displays the outline of the image. The user can select a block, change colors, etc. for each block selection in the first gray image through the selection tool 540 of the color editing interface. The selection tool 540 includes a cut key 541, a cancel key 542, and a color key 543, the cut key 541 is for selecting a color-changed block, the cancel key 542 is for canceling the selected block, and the color key 543 is for performing color change. Specifically, the processor 101 may identify the boundaries of the respective blocks in the first gray-scale image by an edge detection technique to form the outline of the image to be displayed 510 as shown in fig. 5(a), wherein the edge detection technique is to use a gray-scale histogram algorithm or a gradient algorithm. Then, the user clicks the cropping key 541 and selects the block 520 to be color-adjusted, the touch screen 174 receives a cropping command generated by the user clicking the cropping key 541 and selecting the block 520 and sends the cropping command to the processor 101, and the processor 101 responds to the cropping command and displays the boundary of the block 520 with a dotted line according to the area and boundary coordinates of the block 520 as shown in fig. 5(b) to visually display the selected block to the user.

Then, the user clicks the color key 543, and the processor 101 replaces the portion of the selected block 520 in the first grayscale image with the second grayscale image and splices the portion into a composite grayscale image. The resultant gray image is table-look-up driven by the timing controller 108, displayed in a 16-gray refresh mode such as GC16, GU16, etc., and finally displayed as the resultant gray image 511 shown in fig. 5(c), in which the block 521 is displayed as the second gray image and the rest is displayed as the first gray image.

In more detail, the timing controller 108 performs table look-up (LUT) according to parameters such as a previous frame gray value, a next frame gray value, and a current ink screen temperature of each pixel in the 4-bit gray data to obtain a suitable driving waveform for driving the black-and-white particles in each pixel from a current position to a next frame image position, where the driving waveform includes information such as voltage, pulse frequency, and pulse duration, and after the driving waveform is obtained by table look-up, the driving waveform can be used to drive the ink capsules corresponding to the pixel position on the ink screen 134, so that the black-and-white particles therein move at different distances to form corresponding gray colors. Where temperature data is provided by temperature sensor 154. Finally, the ink screen 134 is driven according to the searched driving waveform, and the display of the composite gray image 511 is realized.

Since the ink screen 134 displays images by moving black and white particles, after a plurality of pages are turned, the image sticking is often generated, especially if the page has a picture, the image sticking is more easily generated, and therefore refreshing is required to remove the image sticking so that the page is more concise. The invention adopts a 16-gray local refresh mode or a full-screen refresh mode, and when the afterimage is not serious and the fast refresh is needed, the local refresh mode can be used, for example, GU16 directly outputs 16-gray pixels which are changed with the last output without performing the screen refresh operation before the data output. In some application scenarios, the color ink screen has heavy refreshing afterimage, and a full screen refresh mode may also be used, for example, the GC16 re-outputs all pixels in the refresh area, performs a screen refresh operation on the refresh area before outputting, and can support 16 gray pixels.

In another implementation scenario, the processor 101 may also be preset to perform an automatic recognition operation, and the switch key 530 is used as a trigger switch, and the processor 101 responds to the touch instruction to automatically recognize the text and the picture in the image to be displayed, where the text portion is displayed as a grayscale frame and the picture portion is displayed as a color frame.

In another implementation scenario, preset in the color mode, when a user clicks an object such as a different region, a key, a picture, etc. on the display image by using a finger or an electromagnetic pen (e.g., long-time pressing or continuous clicking), the touch screen 174 receives a touch instruction generated by the object clicked by the user and sends the touch instruction to the processor 101, the processor 101 automatically identifies characters and pictures in the image to be displayed in response to the touch instruction, and the character part is displayed in a grayscale frame; the picture portion is displayed in a color picture.

Further, after the automatic identification operation, the user can manually select the color/grayscale display conversion of the local area through the selection tool 540. Finally, the composite image is refreshed again by the ink screen 134, so that the display effect of local color and local gray scale is realized.

In the case of displaying in the non-color mode, the gray scale effect can be displayed in the embodiment with the color filter 136 covered, because the color image is not discarded and retained according to the pixel color arrangement position of the color filter, and therefore the color component represented by the display gray scale of the pixel on the ink screen does not correspond to the color printed on the color filter 136 in the physical space, and therefore the color filter does not perform polarization filtering on the gray scale on the ink screen when the light is reflected, and the color expression capability is lost.

Fig. 6 is a schematic diagram illustrating a method for locally transforming display colors according to another embodiment of the present invention, and as shown in fig. 6, the method 600 includes the following steps.

In step 601, an image to be displayed is received and displayed. Specifically, the processor receives an image to be displayed, and when the non-color mode is preset, the image to be displayed is displayed in a gray picture, and conversely, when the color mode is preset, the image to be displayed is displayed in a color picture. Then, the image to be displayed is subjected to gray scale conversion to obtain a first gray scale image and a second gray scale image. The ink screen displays an image to be displayed in the form of a first gray image or a second gray image. The manner of converting the image to be displayed into the grayscale image has been described in the above embodiments, and is not described again.

In step 602, a local range in the image to be displayed is selected according to a setting, where the setting may be manual or automatic, and the manual mode is that the method 600 receives a touch instruction generated by a user clicking a switch key, and responds to the touch instruction to open a color editing interface, and displays a selection tool for the user to select a local range conversion color. The automatic mode is that the method 600 automatically identifies the text and the picture in the image to be displayed, and if the text and the picture are in the color mode, the text part is selected as the local range; if in the non-color mode, the picture portion is selected as the local area.

Specifically, the selection is to identify the boundary of each block in the first gray image by an edge detection technique, wherein the edge detection technique is a gray histogram algorithm or a gradient algorithm. After the user selects the block, the method 600 determines the selected local range according to the area and boundary coordinates of the selected block.

In step 603, it is determined that the local area is displayed in a gray scale screen or a color screen. When the mode is preset to be the non-color mode, the image to be displayed is displayed as a gray scale image, and the local range selected by the user through the method 600 is replaced by a color image for display; on the contrary, when the color mode is preset, the image to be displayed is displayed in a color frame, and the local area is replaced by a gray frame.

If the local area needs to be displayed in color, step 604 is performed. Specifically, the image to be displayed is originally displayed as a gray-scale image, and the user clicks the switch button, and the method 600 changes the gray-scale image in the local range into color display.

In step 605, the remaining portion of the image to be displayed is displayed in a grayscale screen. The method 600 displays the remaining portion of the image to be displayed still in a grayscale.

If the local area needs to be displayed as a gray-scale image, step 606 is performed. Specifically, the image to be displayed is originally displayed in a color frame, and when the user clicks a switch button in the color editing interface, the method 600 changes the color of the local image into gray scale.

In step 607, the rest of the image to be displayed is displayed in a color picture. The method 600 displays the remaining portion of the image to be displayed still in color.

The image synthesis method has been described in the above embodiments, and is not described again.

Another embodiment of the invention is a computer readable storage medium having stored thereon a computer program code for locally transforming a display color, which when executed by a processor performs the method as shown in fig. 6.

It should also be appreciated that any module, unit, component, server, computer, terminal, or device executing instructions exemplified herein may include or otherwise have access to a computer-readable medium, such as a storage medium, computer storage medium, or data storage device (removable) and/or non-removable, such as a magnetic disk, optical disk, or tape. Computer-readable storage media may include volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information, such as computer-readable instructions, data structures, program modules, or other data.

Computer-readable storage media includes RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by an application, a module, or both. Any such computer readable storage media may be part of or accessible or connectable to a device. Any applications or modules described herein may be implemented using computer-readable/executable instructions that may be stored or otherwise maintained by such computer-readable media.

Through the foregoing description of the embodiments, those skilled in the art can understand that the reading terminal of the present invention is not limited to displaying the whole frame in gray scale or color, but can change the block color locally, so that the gray scale and the color are displayed in the same frame, and the visual perception of the user can be enhanced.

The foregoing detailed description of the embodiments of the present disclosure has been presented for purposes of illustration and description and is intended to be exemplary only and is not intended to be exhaustive or to limit the invention to the precise forms disclosed; meanwhile, for the person skilled in the art, based on the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the present disclosure should not be construed as limiting the present disclosure.

Claims

1. A reading terminal capable of locally changing display colors, comprising:

the ink screen is used for displaying an image to be displayed;

the color filter film is arranged on the ink screen and is provided with a plurality of pixel units, wherein each pixel unit comprises red, green and blue pixels and is used for displaying the color of the image to be displayed;

the touch screen is used for selecting the information of the local range in the image to be displayed according to the setting; and

a processor for displaying the local range in a grayscale or color picture; when the local range is displayed by the gray scale picture, the rest part of the image to be displayed is displayed by the color picture; and when the local range is displayed by the color picture, the rest part of the image to be displayed is displayed by the gray picture.

2. The reading terminal of claim 1, wherein the processor performs a grayscale calculation for a grayscale screen display range to convert to a first grayscale image.

3. The reading terminal of claim 1, wherein the processor controls the local scope to be displayed in the grayscale screen when the local scope is text; when the local range is a picture, the processor controls the local range to be displayed by the color picture.

4. The reading terminal of claim 1, wherein the touch screen receives information that the user selects the local area.

5. A method for changeable display colors for an ink screen reading terminal, comprising:

receiving an image to be displayed;

selecting a local range in the image to be displayed according to setting; and

judging that the local range is displayed by a gray scale picture or a color picture;

if the local range is displayed in the gray scale picture, then:

displaying the local range in the gray scale picture; and

displaying the rest part of the image to be displayed in the color picture;

if the local area is displayed in the color picture, then:

displaying the local range in the color picture; and

and displaying the rest part of the image to be displayed by the gray scale picture.

6. The method of claim 5, wherein the step of displaying in the grayscale picture comprises:

the gradation calculation is performed for the gradation picture display range to convert into a first gradation image.

7. The method of claim 6, wherein the performing the gray scale calculation is converting the gray scale screen display range into the first gray scale image using a floating point method, an integer method, a shift method, or an average value method.

8. The method of claim 5, wherein the selecting step comprises:

identifying a character area and a picture area of the image to be displayed;

and setting one of the character area and the picture area as the local range.

9. The method of claim 5, wherein the selecting step comprises:

and receiving information of a local range in the image to be displayed selected by a user.

And looking up a table according to the temperature of the ink screen, and outputting a driving waveform corresponding to the synthesized gray level image.

10. A computer-readable storage medium having stored thereon a computer program code for locally transforming a display color, which computer program code, when executed by a processor, performs the method according to any of claims 5 to 9.