CN106559624B - Image-text superposition device and image-text superposition method - Google Patents
Image-text superposition device and image-text superposition method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2624—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects for obtaining an image which is composed of whole input images, e.g. splitscreen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
- H04N5/45—Picture in picture, e.g. displaying simultaneously another television channel in a region of the screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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Abstract
The invention provides a device and a method for superimposing pictures and texts, wherein the device comprises: the microprocessor is used for responding to the input operation of a user on an input device connected to the microprocessor and outputting the data of the images/texts to be superposed; the programmable logic device is used for receiving the image data input by the video interface, receiving the image/text data to be superimposed, judging the data format of the image/text data to be superimposed, and performing superimposition processing on a plurality of color components of the image/text data to be superimposed and a plurality of color components of the image data input by the video interface pixel by pixel when the data format of the image/text data to be superimposed is text data to obtain superimposed image data as output; and the volatile memory is electrically connected with the programmable logic device and used as a data cache. Therefore, the invention respectively superposes the text data to be superposed pixel by pixel in a color channel-by-color channel mode, thereby increasing the diversity of superposition and further achieving different display effects.
Description
Technical Field
The invention relates to the technical field of display control, in particular to a picture and text superposition device and a picture and text superposition method.
Background
The display screen can display images or texts, sometimes a plurality of images or a plurality of sections of texts need to be displayed on the display screen, and even the plurality of images or texts can be subjected to plane superposition according to priority to present a hierarchical relationship; for example, PIP (Picture-In-Picture), OSD (On Screen Display), and the like are implemented using a hierarchical overlay of images or text.
The traditional high-definition base image and text superposition processing system adopts pure software for superposition or a special image processing chip such as a DSP as a main processor for processing. However, with pure software for overlay, the processing speed is slower, which is the case if high definition base maps (e.g. FHD, 2K or 4K video images) are used; however, the DSP is adopted as the image processing main processor, so that the processing speed and the flexibility of the external interface are poor.
Disclosure of Invention
Therefore, the present invention provides a graphics context superimposing apparatus and a graphics context superimposing method, which are directed to the defects and shortcomings in the prior art.
Specifically, an image-text superimposing apparatus provided in an embodiment of the present invention includes: the microprocessor is used for responding to the input operation of a user on an input device connected to the microprocessor and outputting the data of the images/texts to be superposed; and the programmable logic device is electrically connected with the microprocessor and is used for receiving image data input by a video interface, receiving the image/text data to be superimposed, judging the data format of the image/text data to be superimposed, and superimposing the image/text data to be superimposed and the image data input by the video interface when the data format of the image/text data to be superimposed is text data so as to output superimposed image data, wherein the superimposing is as follows: judging whether the multiple color components of the image/text data to be superimposed respectively meet corresponding multiple color component threshold conditions pixel by pixel, and selecting each color channel data of the multiple color channel data of the image data after the superimposition processing as one of the corresponding color component of the image/text data to be superimposed and the corresponding color component of the image data input by the video interface according to a judgment result; and the volatile memory is electrically connected with the programmable logic device and used as a data cache.
In an embodiment of the present invention, the color components are RGB components, the color channel data are RGB channel data, the microprocessor is an MCU, and the programmable logic device is an FPGA.
In an embodiment of the present invention, the programmable logic device is further configured to, when the data format of the to-be-superimposed graph/text data is picture data, superimpose the to-be-superimposed graph/text data onto the video interface input image data by using the video interface input image data as a base graph.
In an embodiment of the present invention, the selecting, according to the determination result, which of the corresponding color component of the to-be-superimposed drawing/text data and the corresponding color component of the video interface input image data is to be selected as each of the plurality of color channel data of the image data after the superimposition processing includes: and when the first color component of the image/text data to be superimposed meets the corresponding first color component threshold condition, selecting the first color component of the image/text data to be superimposed as first color channel data of the image data after superimposition processing, and otherwise, selecting the first color component of the image data input by the video interface as the first color channel data of the image data after superimposition processing.
In an embodiment of the present invention, the selecting, according to the determination result, which of the corresponding color component of the to-be-superimposed drawing/text data and the corresponding color component of the video interface input image data is to be selected as each of the plurality of color channel data of the image data after the superimposition processing includes: when the color components of the image/text data to be superimposed all meet the corresponding color component threshold conditions, selecting the color components of the image/text data to be superimposed as the color channel data of the image data after the superimposition processing, and otherwise, selecting the color components of the image data input by the video interface as the color channel data of the image data after the superimposition processing.
In addition, an image-text superimposing method provided by the embodiment of the present invention includes the steps of: (i) receiving image data input by a video interface; (ii) judging whether the image/text data to be superimposed is input; (iii) judging the data format of the image/text data to be superimposed after the image/text data to be superimposed is input; (iv) when the data format of the image/text data to be superimposed is picture data, superimposing the image/text data to be superimposed on the video interface input image data by taking the video interface input image data as a base image to obtain superimposed image data as output; and (v) when the data format of the overlay image/text data is text data, respectively overlaying the color components of the overlay image/text data to be overlaid with the color components of the video interface input image data pixel by pixel to obtain the image data after overlaying processing as output.
In an embodiment of the present invention, step (v) specifically includes: and when the first color component of the image/text data to be superimposed meets the corresponding first color component threshold condition, selecting the first color component of the image/text data to be superimposed as first color channel data of the image data after superimposition processing, and otherwise, selecting the first color component of the image data input by the video interface as the first color channel data of the image data after superimposition processing.
In an embodiment of the present invention, step (v) specifically includes: and when the color components of the image/text data to be superimposed all meet corresponding color component threshold conditions, selecting the color components of the image/text data to be superimposed as color channel data of the image data after the superimposition processing respectively, and otherwise, selecting the color components of the image data input by the video interface as the color channel data of the image data after the superimposition processing respectively.
In an embodiment of the present invention, the image-text superimposing method further includes the steps of: and responding to the user input operation to provide the image/text data to be superimposed.
In an embodiment of the present invention, the image-text superimposing method further includes the steps of: and generating OSD data as the image/text data to be superimposed by the microprocessor in response to the user input operation.
As can be seen from the above, the embodiments of the present invention can achieve one or more of the following advantages: a) when the image/text data to be superimposed is text data, the RGB component superimposition is adopted, so that the superimposition diversity is increased, and the paths can be divided for superimposition to achieve different display effects; b) multiple images or images and texts can be displayed on one display screen at the same time, so that a user can obtain more information from one display screen; and c) when the video interface is applied to the field of picture-in-picture, the cost of a plurality of display screens can be completely saved, and the function that 1 video interface displays a plurality of pictures simultaneously is realized.
Other aspects and features of the present invention will become apparent from the following detailed description, which proceeds with reference to the accompanying drawings. It is to be understood, however, that the drawings are designed solely for purposes of illustration and not as a definition of the limits of the invention. It should be further understood that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, they are merely intended to conceptually illustrate the structures and procedures described herein.
Drawings
The following detailed description of embodiments of the invention will be made with reference to the accompanying drawings.
Fig. 1A is a schematic block diagram of an image-text superimposing apparatus according to an embodiment of the present invention.
Fig. 1B is a schematic diagram of a superimposition effect after superimposing OSD data in a text format on input image data of a video interface.
Fig. 1C is a schematic diagram of a superimposition effect after superimposing the picture-format OSD data on the video interface input image data.
Fig. 2 is a schematic diagram of the teletext stacking process of the teletext stacking arrangement shown in fig. 1A.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1A, the image-text superimposing apparatus provided in the embodiment of the present invention employs a Programmable logic device 11, such as an FPGA (Field Programmable Gate Array), as an image main processor, an IP core integrated inside the FPGA and having a constantly upgraded function can implement functions of a plurality of external chips, so as to reduce space occupation of the external chips on a circuit board, and the FPGA processes multiple paths of data in parallel, so that the processing speed is high, the bandwidth is large, and a volatile memory 15, such as a DDR3 or a higher-frequency DDR is used as an image data cache to implement a larger read-write bandwidth; and the FPGA periphery employs a microprocessor 13, such as an MCU, to handle human-computer interaction tasks.
Specifically, with high-definition image data (e.g., FHD, 2K, or 4K image data) input from a video interface (e.g., DVI, HDMI, or SDI interface, etc.) electrically connected to the programmable logic device 11 as a background (i.e., an object to be superimposed), if a user needs to display a text or a picture on a high-definition base image, the user needs to operate the input device 17, the input device 17 sends user operation information to the microprocessor 13, and the microprocessor 13 sends RGB data to be displayed with the text or the picture to the programmable logic device 11 for superimposition processing. Here, the input device 17 may be a knob, a mouse, a touch screen or even a computer system.
In view of the above, fig. 1B is a schematic diagram of a superimposition effect of superimposing OSD data in a text format on input image data of a video interface, and fig. 1C is a schematic diagram of a superimposition effect of superimposing OSD picture data on input image data of a video interface. More specifically, referring to fig. 1A, the programmable logic device 11 receives video interface input image data through a video interface such as DVI, HDMI, SDI, or the like, the microprocessor 13 receives an instruction output by the user through the input device 17 to generate OSD data (text format or picture format), both the video interface input image data and the OSD data are in RGB format, and then the programmable logic device 11 performs superimposition processing on the video interface input image data from the video interface and the OSD data from the microprocessor 13, and if the OSD data is text data, a schematic diagram of a superimposition effect after the superimposition processing is shown in fig. 1B, and if the OSD data is picture data, a schematic diagram of a superimposition effect after the superimposition processing is shown in fig. 1C. Programmable logic device 11 includes a data format register, an and/or overlay mode selection register, a threshold register, and the like, which are configured by microprocessor 13. Of course, it is understood that the image-text superimposing apparatus shown in fig. 1A according to the embodiment of the present invention is not limited to superimposing OSD data on the input image data of the video interface, and may also be other text data or image data directly input by the user operating the input device 17.
In order to more clearly understand the embodiment of the present invention, the text-superimposing process of the text-superimposing apparatus according to the embodiment of the present invention will be described in detail with reference to fig. 1A and 2.
Specifically, the programmable logic device 11 first determines whether image/text data to be superimposed is input from the microprocessor 13, and outputs image data input by the video interface if no image/text data to be superimposed is input; the method for determining whether the graphics/text data to be superimposed is input may be implemented by signal waveform detection, for example, when the microprocessor 13 sends the graphics/text data to be superimposed to the programmable logic device 11, the microprocessor 13 triggers the programmable logic device 11 to generate an effective signal synchronized with the graphics/text data to be superimposed.
If the image/text data to be superimposed is input to the programmable logic device 11 from the microprocessor 13, determining whether the input image/text data to be superimposed is picture data (that is, determining whether the data format of the input image/text data to be superimposed is text or picture), and if the input image/text data is picture data, superimposing the picture data to the video interface input image data (for example, in a picture covering manner) by using the video interface input image data as a base image to obtain superimposed image data as output; otherwise, if the image data is not the picture data (i.e., the text data), the superimposition mode is determined. Here, the data format judgment of the drawing/text data to be superimposed may be determined by detecting the contents of a data format register configured by the microprocessor 13 in the programmable logic device 11.
The overlay mode determination may be implemented by detecting the content of an and/or overlay mode selection register in the programmable logic device 11, and after the overlay mode determination is performed, determining which of four threshold overlay modes, i.e., a "less than threshold", "equal to threshold", "greater than threshold", and "not equal to threshold", and the component threshold values corresponding to the three RGB components are currently used according to a threshold register in the programmable logic device 11 for processing. More specifically:
(1a) when the current overlay mode is an or mode and an overlay mode of less than a threshold value is adopted, the programmable logic device 11 compares the RGB components of the text data to be overlaid, which are input from the microprocessor 13, with the RGB component threshold values respectively pixel by pixel; if a certain color component is smaller than the corresponding color component threshold (namely, the color component threshold condition is met), selecting the color component of the text data to be superimposed as the corresponding color channel data of the image data after the superimposition processing; otherwise, if the color component is greater than or equal to the corresponding color component threshold, selecting the color component of the image data input by the video interface as the corresponding color channel data of the image data after the superposition processing. Taking the R component as an example, if the R component of the text data to be superimposed is smaller than the R component threshold, selecting the R component of the text data to be superimposed as R channel data (or called R component) of the image data after the superimposition processing; and otherwise, if the R component of the text data to be superposed is greater than or equal to the R component threshold value, selecting the R component of the image data input by the video interface as R channel data of the superposed image data.
(1b) When the current overlay mode is an or mode and an overlay mode of 'equal to a threshold' is adopted, the programmable logic device 11 compares the RGB components of the text data to be overlaid, which are input from the microprocessor 13, with the RGB component threshold value respectively pixel by pixel; if a certain color component is equal to the corresponding color component threshold (namely, the color component threshold condition is met), selecting the color component of the text data to be superimposed as the corresponding color channel data of the image data after the superimposition processing; otherwise, if the color component is not equal to the corresponding color component threshold, the color component of the image data input by the video interface is selected as the corresponding color channel data of the image data after the superposition processing. Taking the R component as an example, if the R component of the text data to be superimposed is equal to the R component threshold, selecting the R component of the text data to be superimposed as R channel data of the image data after the superimposition processing; otherwise, if the R component of the text data to be superimposed is not equal to the R component threshold, selecting the R component of the image data input by the video interface as R channel data of the image data after the superimposition processing.
(1c) When the current overlay mode is an or mode and an overlay mode of 'greater than a threshold value' is adopted, the programmable logic device 11 compares the RGB components of the text data to be overlaid, which are input from the microprocessor 13, with the RGB component threshold values respectively pixel by pixel; if a certain color component is larger than the corresponding color component threshold (namely, the color component threshold condition is met), selecting the color component of the text data to be superimposed as the corresponding color channel data of the image data after the superimposition processing; otherwise, if the color component is less than or equal to the corresponding color component threshold, the color component of the image data input by the video interface is selected as the corresponding color channel data of the image data after the superposition processing. Taking the R component as an example, if the R component of the text data to be superimposed is greater than the R component threshold, selecting the R component of the text data to be superimposed as R channel data of the image data after the superimposition processing; and otherwise, if the R component of the text data to be superposed is smaller than or equal to the R component threshold value, selecting the R component of the image data input by the video interface as R channel data of the image data after superposition processing.
(1d) When the current overlay mode is an or mode and an overlay mode which is not equal to a threshold value is adopted, the programmable logic device 11 compares the RGB components of the text data to be overlaid, which are input from the microprocessor 13, with the RGB component threshold values respectively pixel by pixel; if a certain color component is not equal to the corresponding color component threshold (namely, the color component threshold condition is met), selecting the color component of the text data to be superimposed as corresponding color channel data of the image data after the superimposition processing; otherwise, if the color component is equal to the corresponding color component threshold, the color component of the image data input by the video interface is selected as the corresponding color channel data of the image data after the superposition processing. Taking the R component as an example, if the R component of the text data to be superimposed is not equal to the R component threshold, selecting the R component of the text data to be superimposed as R channel data of the image data after the superimposition processing; and otherwise, if the R component of the text data to be superposed is equal to the R component threshold value, selecting the R component of the image data input by the video interface as R channel data of the image data after superposition processing.
(2a) When the current superposition mode is an AND mode and a superposition mode of less than a threshold value is adopted, the programmable logic device 11 compares the RGB components of the text data to be superposed, which are input from the microprocessor 13, with the RGB component threshold value respectively pixel by pixel; if the RGB components are smaller than the RGB component threshold values corresponding to the RGB components (namely, the RGB components meet the color component threshold value condition), selecting the RGB components of the text data to be superimposed respectively as RGB channel data of the image data after the superimposition processing; and otherwise, if at least one color component in the RGB components is larger than or equal to the corresponding color component threshold value, selecting the RGB components of the image data input by the video interface as the RGB channel data of the image data after the superposition processing respectively.
(2b) When the current overlay mode is an and mode and an overlay mode of 'equal to a threshold' is adopted, the programmable logic device 11 compares the RGB components of the text data to be overlaid, which are input from the microprocessor 13, with the RGB component threshold respectively pixel by pixel; if the RGB components are equal to the respective corresponding RGB component thresholds (that is, the RGB components all meet the color component threshold condition), selecting the RGB components of the text data to be superimposed as RGB channel data of the image data after the superimposition processing respectively; and otherwise, if at least one color component in the RGB components is not equal to the corresponding color component threshold value, selecting the RGB components of the image data input by the video interface as the RGB channel data of the image data after the superposition processing respectively.
(2c) When the current superposition mode is an AND mode and a superposition mode of 'greater than a threshold value' is adopted, the programmable logic device 11 compares the RGB components of the text data to be superposed, which are input from the microprocessor 13, with the RGB component threshold values respectively pixel by pixel; if the RGB components are all larger than the RGB component threshold values corresponding to the RGB components (namely, the RGB components all meet the color component threshold value condition), selecting the RGB components of the text data to be superimposed as RGB channel data of the image data after the superimposition processing respectively; and otherwise, if at least one color component in the RGB components is smaller than or equal to the corresponding color component threshold value, selecting the RGB components of the image data input by the video interface as the RGB channel data of the image data after the superposition processing respectively.
(2d) When the current overlay mode is an and mode and an overlay mode of not being equal to a threshold value is adopted, the programmable logic device 11 compares the RGB components of the text data to be overlaid, which are input from the microprocessor 13, with the RGB component threshold values respectively pixel by pixel; if the RGB components are not equal to the RGB component thresholds corresponding to the RGB components (namely, the RGB components all meet the color component threshold condition), selecting the RGB components of the text data to be superimposed as RGB channel data of the image data after the superimposition processing respectively; and otherwise, if at least one color component in the RGB components is equal to the corresponding color component threshold value, selecting the RGB components of the image data input by the video interface as the RGB channel data of the image data after the superposition processing respectively.
Finally, the image data after the superimposition processing obtained by the programmable logic device 11 can be sent to a display screen for displaying, and if the image/text data to be superimposed is OSD data, a user can observe the operation result through the display screen.
In summary, the embodiments of the present invention can achieve one or more of the following advantages: a) when the graph/text data to be superimposed is text data, RGB component superimposition is adopted, so that the diversity of superimposition is increased, and the graph/text data can be superimposed in channels to achieve different display effects (such as different display effects shown in fig. 1B and fig. 1C); b) multiple images or images and texts can be displayed on one display screen at the same time, so that a user can obtain more information from one display screen; and c) when the video interface is applied to the field of picture-in-picture, the cost of a plurality of display screens can be completely saved, and the function that 1 video interface displays a plurality of pictures simultaneously is realized. In addition, it should be noted that the microprocessor 13 in the foregoing embodiment is not limited to the MCU, and may be other microprocessors such as an ARM processor, a DSP processor, and the like; the programmable logic device 11 is not limited to the FPGA, and may be another programmable logic device; the channel-by-channel superimposing method is not limited to superimposing three color channels of RGB, and may be performed by superimposing a plurality of other color channels.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An image-text superimposing apparatus, characterized by comprising:
a microprocessor (13) for outputting drawing/text data to be superimposed in response to an input operation by a user to an input device (17) connected to the microprocessor (13);
the programmable logic device (11) is electrically connected with the microprocessor (13) and is used for receiving image data input by a video interface, receiving the image/text data to be superimposed, judging the data format of the image/text data to be superimposed, and superimposing the image/text data to be superimposed and the image data input by the video interface when the data format of the image/text data to be superimposed is text data so as to output superimposed image data, wherein the superimposing is as follows: judging whether the multiple color components of the image/text data to be superimposed respectively meet corresponding multiple color component threshold conditions pixel by pixel, and selecting each color channel data of the multiple color channel data of the image data after the superimposition processing as one of the corresponding color component of the image/text data to be superimposed and the corresponding color component of the image data input by the video interface according to a judgment result; and
and the volatile memory (15) is electrically connected with the programmable logic device (11) and used as a data cache.
2. The teletext overlayed apparatus of claim 1, wherein the plurality of color components are RGB components, the plurality of color channel data are RGB channel data, the microprocessor is an MCU, and the programmable logic device is an FPGA.
3. The teletext overlay arrangement of claim 1, wherein the programmable logic device is further configured to overlay the text/graphics data to be overlaid onto the video interface input image data with the video interface input image data as a base image when the data format of the text/graphics data to be overlaid is picture data.
4. The image-text superimposing apparatus according to claim 1, wherein the selecting, according to the determination result, each of the plurality of color channel data of the image data after the superimposition processing as which of the corresponding color component of the image/text data to be superimposed and the corresponding color component of the video interface input image data includes:
and when the first color component of the image/text data to be superimposed meets the corresponding first color component threshold condition, selecting the first color component of the image/text data to be superimposed as first color channel data of the image data after superimposition processing, and otherwise, selecting the first color component of the image data input by the video interface as the first color channel data of the image data after superimposition processing.
5. The image-text superimposing apparatus according to claim 1, wherein the selecting, according to the determination result, each of the plurality of color channel data of the image data after the superimposition processing as which of the corresponding color component of the image/text data to be superimposed and the corresponding color component of the video interface input image data includes:
when the color components of the image/text data to be superimposed all meet the corresponding color component threshold conditions, selecting the color components of the image/text data to be superimposed as the color channel data of the image data after the superimposition processing, and otherwise, selecting the color components of the image data input by the video interface as the color channel data of the image data after the superimposition processing.
6. A method for superimposing pictures and texts is characterized by comprising the following steps:
(i) receiving image data input by a video interface;
(ii) judging whether the image/text data to be superimposed is input;
(iii) judging the data format of the image/text data to be superimposed after the image/text data to be superimposed is input;
(iv) when the data format of the image/text data to be superimposed is picture data, superimposing the image/text data to be superimposed on the video interface input image data by taking the video interface input image data as a base image to obtain superimposed image data as output;
(v) when the data format of the image/text data to be superimposed is text data, superimposing, pixel by pixel, the plurality of color components of the image/text data to be superimposed with the plurality of color components of the image data input by the video interface, respectively, to obtain superimposed image data as output, wherein the superimposing is performed by: judging whether the color components of the image/text data to be superimposed respectively meet corresponding color component threshold conditions or not pixel by pixel, and selecting each color channel data of the image data after the superimposition processing as one of the corresponding color component of the image/text data to be superimposed and the corresponding color component of the image data input by the video interface according to a judgment result.
7. The teletext overlaying method of claim 6, wherein step (v) specifically comprises: and when the first color component of the image/text data to be superimposed meets the corresponding first color component threshold condition, selecting the first color component of the image/text data to be superimposed as first color channel data of the image data after superimposition processing, and otherwise, selecting the first color component of the image data input by the video interface as the first color channel data of the image data after superimposition processing.
8. The teletext overlaying method of claim 6, wherein step (v) specifically comprises: and when the color components of the image/text data to be superimposed all meet corresponding color component threshold conditions, selecting the color components of the image/text data to be superimposed as color channel data of the image data after the superimposition processing respectively, and otherwise, selecting the color components of the image data input by the video interface as the color channel data of the image data after the superimposition processing respectively.
9. The teletext overlay method of claim 6, further comprising the steps of: and responding to the user input operation to provide the image/text data to be superimposed.
10. The teletext overlay method of claim 6, further comprising the steps of: and generating OSD data as the image/text data to be superimposed by the microprocessor in response to the user input operation.
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| CN107016976A (en) * | 2017-05-31 | 2017-08-04 | 西安诺瓦电子科技有限公司 | Display control method and device and display screen system |
| CN107205165A (en) * | 2017-07-11 | 2017-09-26 | 成都德芯数字科技股份有限公司 | Picture and text stacking method and device |
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| CN107563956B (en) * | 2017-09-05 | 2020-07-07 | 成都德芯数字科技股份有限公司 | Image-text superposition method and device |
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