CN107888844B - Method and system for image-text and real-time video mixed display, and device and system compatible with video function and image-text video mixed display - Google Patents

Method and system for image-text and real-time video mixed display, and device and system compatible with video function and image-text video mixed display Download PDF

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CN107888844B
CN107888844B CN201711090052.2A CN201711090052A CN107888844B CN 107888844 B CN107888844 B CN 107888844B CN 201711090052 A CN201711090052 A CN 201711090052A CN 107888844 B CN107888844 B CN 107888844B
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video
image
pixel point
lcd
rgb
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CN107888844A (en
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祝涛
潘晓勇
周连华
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Suzhou Lambo Control Techniques Co ltd
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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/64—Circuits for processing colour signals

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention discloses a method and a system for mixed display of graphics, text and real-time video, and a device and a system which are compatible with video functions and mixed display of graphics, text and video, wherein the mixed display method comprises the following steps: receiving LCD control signals, image RGB signals and real-time video signals; integrating the real-time video signals into video RGB signals with the same clock as the LCD; mixing the image RGB signals and the video RGB signals by using a clock of an LCD control signal as a driving source, and analyzing the video RGB signals to form video image RGB signals matched with the resolution of an LCD; and determining the RGB value of each pixel point sent to the LCD by judging the pixel value of each pixel point of the image RGB signal, and outputting the RGB values and the LCD control signal together. The invention not only realizes the mixed display of the image-text and the real-time video screen, but also overcomes the defect that the liquid crystal display is driven by adopting a special integrated drive IC and an ARM chip, improves the stability of the driver by the parallel processing capacity of the FPGA, increases the universality and reduces the development complexity.

Description

Method and system for image-text and real-time video mixed display, and device and system compatible with video function and image-text video mixed display
Technical Field
The invention relates to the field of LCD mixed display, in particular to a method and a system for mixed display of graphics, texts and real-time videos and a device and a system which are compatible with video functions and mixed display of the graphics, the texts and the videos.
Background
The liquid crystal display driving device is an important component for ensuring normal display of liquid crystal, and with the continuous development of liquid crystal display technology, products are often required to be compatible with a real-time video display function, and other prompt information such as icons, prompt characters and symbols is often required to be suspended or transparently displayed on a video image during real-time video display, namely, a mixed display function of image-text and real-time video is required, wherein the requirements of equipment such as automobiles, mine cars, pipeline robots and engineering machinery which need man-machine interaction display on the functions are particularly common.
At present, the application and development of general mixed display of graphics, text and video are mainly divided into two major directions:
(1) by using special liquid crystal driving chip
Video decoding and liquid crystal driving functions are integrated in the chip, such as MSTAR of Taiwan and application-specific integrated chip produced by Ehrlich of Guangdong. The method is suitable for single video display occasions or simple preset OSD windowing processing, and has low universality for mixed display driving of common occasions. In practical application, the system is often used in market monitoring, digital players, TV displays and other occasions. The development mode has the advantages of low cost and short development period.
(2) Adopts a high-end ARM chip
ARM has penetrated many embedded application fields in daily life, such as intelligent terminals like mobile phones, tablets, etc. The liquid crystal display can be diversified by using units such as memory management and an operating system, but for many relatively simple application backgrounds, high development cost and long development period are reasons why the liquid crystal display is difficult to popularize in many fields. In addition, interference is a problem that must be considered and addressed in many environmentally complex engineering applications.
Therefore, it is a problem to be solved that the lcd driving apparatus is compatible with the real-time video display function and the mixed display function of the graphics and text and the real-time video, and can solve the basic problems of cost, stability, and versatility.
Disclosure of Invention
The present invention is directed to solve the above problems in the prior art, and provides a method and a system for displaying a mixed image-text and real-time video, and an apparatus and a system compatible with video functions and displaying a mixed image-text and video.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a mixed display method of graphics, text and real-time video, which comprises the following steps:
s1, receiving LCD control signal, image RGB signal and real-time video signal formed by icon, character and background;
s2, decoding and integrating the real-time video signal into a video RGB signal with the same clock as the clock signal of the LCD;
s3, mixing the video RGB signal of the appointed frame and the corresponding frame image RGB signal by using the clock of the LCD control signal as the driving source, which at least includes the following steps
S31, analyzing the video RGB signals, and forming video image RGB signals matched with the resolution of the LCD through operational amplification and multi-channel video combination;
s32, determining whether the RGB value of each pixel point sent to the LCD is the RGB value of the pixel point corresponding to the RGB signal of the video image, or the RGB value of the pixel point corresponding to the RGB signal of the image, or the RGB value weighted and calculated by the RGB signal and the pixel point by judging the pixel value of each pixel point of the RGB signal of the image;
and S4, outputting the RGB value of each pixel point to be sent to the LCD and the LCD control signal to the LCD display interface.
Preferably, the image RGB signal is formed by drawing a GUI application function, and includes a group of pixels matching with the pixels of the LCD, and a color value of each pixel of the image RGB signal satisfies a Green color value of |0x01 or a Green color value of &0xFE or a tile color value of |0x 01.
Preferably, the real-time video signal is collected by a camera and converted into data in a BT656 format by a video AD conversion chip.
Preferably, the step S32 includes at least the following processes:
s321, judging the value of the lowest bit of the Green color and the value of the lowest bit of the Blue color of each pixel point of the image RGB signal according to the time sequence;
s322, when the lowest bit of the Green color of a certain pixel point of the image RGB signal is judged to be 1, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal;
s323, when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 0, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal;
s324, when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 1, the RGB value sent to the corresponding pixel point on the LCD is determined to be the weighted value of the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal and the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal.
It is another object of the present invention to provide a system for displaying a mixture of text and real-time video, comprising
The information acquisition module is used for receiving LCD control signals, and at least comprises image RGB signals and real-time video signals which are formed by combining icons, characters and backgrounds;
the video decoding module is used for decoding the real-time video signal and integrating the real-time video signal into a video RGB signal with the same clock as the clock signal of the LCD;
a mixing module for mixing the designated frame video RGB signal and the corresponding frame image RGB signal with the clock of the LCD control signal as a driving source, comprising
The video RGB signal decoding unit is used for analyzing the video RGB signals, and forming video image RGB signals matched with the resolution of the LCD through operational amplification and multi-channel video combination;
the judging unit is used for determining that the RGB value of each pixel point sent to the LCD is the RGB value of the pixel point corresponding to the RGB signal of the video image, or the RGB value of the pixel point corresponding to the RGB signal of the image, or the RGB value weighted and calculated by the RGB signal and the pixel point;
and the signal output module is used for outputting the RGB value of each pixel point to be sent to the LCD and the LCD control signal to the LCD display interface.
Preferably, the judging unit includes
The judgment subunit is used for judging the value of the lowest bit of the Green color and the value of the lowest bit of the Blue color of each pixel point of the image RGB signal according to the time sequence;
a final pixel value acquisition unit for
When the lowest bit of the Green color of a certain pixel point of the image RGB signal is judged to be 1, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal;
when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 0, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal;
when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 1, the RGB value sent to the corresponding pixel point on the LCD is determined to be the weighted value of the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal and the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal.
A further objective of the present invention is to provide a device for compatible video function and mixed display of graphics, text and video, comprising an MCU and a field programmable gate array, wherein the MCU comprises a selection resistor for connecting with an LCD display interface or the field programmable gate array, and the field programmable gate array can obtain real-time video signals, and comprises an interface for connecting with an LCD display interface and any one of the graphics, text and real-time video mixed display systems.
Preferably, the MCU, the selection resistor and the field programmable gate array are integrated on a PCB.
A further object of the present invention is to provide a system for displaying a mixture of a video function and a text video, which comprises any one of the above devices for displaying a mixture of a video function and a text video, wherein the device for displaying a mixture of a video function and a text video is connected to an LCD display interface and a video capture device.
Preferably, the video acquisition device comprises a camera and a video AD conversion chip for converting camera signals into BT656 format data, and the video AD conversion chip is connected with the field programmable gate array.
The technical scheme of the invention has the advantages that:
the invention has exquisite design and simple method, sets the RGB value of each pixel point of the image composed of the icons, the characters and the like into a screening mechanism for mixing the subsequent images and texts and the real-time video screen in advance, analyzes the real-time video signal through the FPGA, and mixes the icons, the characters and the like with the real-time video through the transmission of the pixel property according to the preset screening mechanism, thereby not only realizing the mixed display function of the images and the texts and the real-time video screen, but also solving the defect that a liquid crystal display is driven by adopting a special integrated drive IC and an ARM chip, improving the stability of a driver by the parallel processing capability of the FPGA, increasing the universality of the driver by formulating a control instruction rule and reducing the development complexity.
The device compatible with the video function and the mixed display of the image, the text and the video can connect the selection resistor with the LCD display interface or the FPGA according to actual needs, and the FPGA can be connected with the real-time video acquisition device and the LCD display interface, so that the compatibility of the real-time video function is realized, the structure is simple and feasible, the cost is low, and the integration level of equipment is high.
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FIG. 1 is a schematic process diagram of the process of the present patent;
fig. 2 is a block diagram of a compatible video function and teletext video hybrid display system according to the patent.
Detailed Description
Objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments. The embodiments are merely exemplary for applying the technical solutions of the present invention, and any technical solution formed by replacing or converting the equivalent thereof falls within the scope of the present invention claimed.
The patent discloses a system for displaying mixed images, texts and real-time videos, as shown in figure 2, comprising an information acquisition module, a video decoding module, a mixing module and a signal output module, wherein
The information acquisition module is used for receiving LCD control signals, and at least comprises image RGB signals and real-time video signals which are formed by combining icons, characters and backgrounds;
the LCD control signals include at least an EN (enable) signal, a CLK (clock) signal, and a line signal and a field signal of the video signal can be extracted through the EN signal, so that whether a data value is valid and a position at each clock can be confirmed.
The image RGB signal is formed by drawing through a GUI application function, and comprises a group of pixel points matched with the pixel points of the LCD, and the color value of each pixel point of the image RGB signal meets the condition that the value of Green color is |0x01 or the value of Green color is &0xFE or the value of File color is |0x01, wherein "0 x" represents 16-bit system, and the representation method can comprise the conditions of RGB888 and RGB 565.
When the value of the Green color of a certain pixel point is |0x01, the lowest order of the Green color of the pixel point can be ensured to be 1, and the pixel point is transparent; when the value of the tile color of a certain pixel point is |0x01, the lowest order of the Blue color of the pixel point can be ensured to be 1, and the pixel point is in mixed display at the moment; when the value of the Green color of a certain pixel point is &0xFE, the lowest bit of the Green color of the pixel point can be ensured to be 0, and correspondingly, the pixel point is displayed in a suspension manner.
The real-time video signal is an NTSC-format signal acquired by a camera and is converted into BT 656-format data of 54M clock by a video AD conversion chip.
The video decoding module is configured to decode and integrate the real-time video signal into a video RGB signal having the same clock as the clock signal of the LCD, where the clock of the LCD may be any clock, and is not described herein again in the prior art.
The mixing module for mixing a designated frame video RGB signal and a corresponding frame image RGB signal with a clock of the LCD control signal as a driving source includes
The video RGB signal decoding unit is used for analyzing the video RGB signals, and forming video image RGB signals matched with the resolution of the LCD through operational amplification and multi-channel video combination;
and the judging unit is used for determining that the RGB value of each pixel point sent to the LCD is the RGB value of the pixel point corresponding to the RGB signal of the video image, or the RGB value of the pixel point corresponding to the RGB signal of the image, or the RGB value weighted and calculated by the RGB signal and the pixel point.
Specifically, the judging unit includes
The judgment subunit is used for judging the value of the lowest bit of the Green color and the value of the lowest bit of the Blue color of each pixel point of the image RGB signal according to the time sequence;
the final pixel value acquisition unit is used for determining that the RGB value sent to the corresponding pixel point on the LCD is the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal when the lowest bit of the Green color of a certain pixel point of the image RGB signal is judged to be 1; when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 0, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal; when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 1, the RGB value sent to the corresponding pixel point on the LCD is determined to be the weighted value of the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal and the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal.
And the signal output module is used for outputting the RGB value of each pixel point to be sent to the LCD and the LCD control signal to the LCD display interface.
The method for displaying the mixed image-text and real-time video corresponding to the system comprises the following steps as shown in the attached figure 1:
s1, receiving LCD control signal, image RGB signal formed by icon, character and background and real-time video signal.
S2, the real-time video signal is decoded and integrated into a video RGB signal having the same clock as the clock signal of the LCD.
S3, mixing the video RGB signal of the appointed frame and the corresponding frame image RGB signal by using the clock of the LCD control signal as the driving source, which at least includes the following steps
S31, firstly analyzing a field signal of a frame of video, which is the beginning of a picture, then analyzing a line signal of the video, which is the beginning of a first line, and simultaneously knowing the position and the RGB value of a first pixel point, correspondingly determining the position and the RGB value of each pixel point of a frame of video image.
S32, determining whether the RGB value of each pixel point sent to the LCD is the RGB value of the pixel point corresponding to the RGB signal of the video image, or the RGB value of the pixel point corresponding to the RGB signal of the image, or the RGB value weighted and calculated by the RGB signal and the pixel point.
The step S32 specifically includes the following steps:
s321, judging the value of the lowest bit of the Green color and the value of the lowest bit of the Blue color of each pixel point of the image RGB signal according to the time sequence.
S322, when the lowest bit of the Green color of a certain pixel point of the image RGB signal is judged to be 1, namely the pixel point of the image RGB signal is transparent, the RGB value sent to the corresponding pixel point on the LCD is determined to be the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal, and finally the corresponding point on the LCD displays the content of the video.
S323, when the lowest bit of Green color of a certain pixel of the RGB image signal is determined to be 0 and the lowest bit of Blue color is determined to be 0, determining that the RGB value sent to the corresponding pixel on the LCD is the RGB value of the pixel corresponding to the pixel on the LCD in the RGB image signal, that is, finally, the pixel corresponding to the LCD displays the content of icons and characters, that is, the icons and characters are displayed in a suspended manner on the video.
S324, when the lowest bit of Green color of a certain pixel of the RGB image signal is determined to be 0 and the lowest bit of Blue color is determined to be 1, determining that the RGB value sent to the corresponding pixel on the LCD is the weighted value of the RGB value of the pixel corresponding to the pixel on the LCD in the RGB video image signal and the RGB value of the pixel corresponding to the pixel on the LCD in the RGB image signal, that is, the pixel corresponding to the LCD is finally displayed in a semi-transparent manner (hybrid display).
Since the lowest bit of the Green color and the lowest bit of the tile color both include 0 and 1, which can be combined into four modes 10, 11, 00, and 01, in addition to the transmission manner of the pixel property corresponding to the above-mentioned determination condition, what pixel property corresponds to each mode can be determined according to actual needs, for example: when the lowest bit of the Green color is 0, the RGB value sent to the corresponding pixel point on the LCD is the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal; when the lowest position of Green color of a certain pixel point of the image RGB signal is judged to be 1 and the lowest position of Blue color is judged to be 1, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal; when the lowest position of Green color of a certain pixel point of the image RGB signal is judged to be 1 and the lowest position of Blue color is judged to be 0, determining that the RGB value sent to the corresponding pixel point on the LCD is the weighted value of the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal and the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal; other corresponding manners are not described in detail.
And S4, outputting the RGB value of each pixel point to be sent to the LCD and the LCD control signal to an LCD display interface together for displaying through the LCD.
As shown in fig. 2, the present patent further discloses a device compatible with video functions and mixed display of graphics, text and video, comprising a MCU1 and a field programmable gate array 3, wherein the MCU1 includes a selection resistor 2 for connecting with an LCD display interface or the field programmable gate array 3, and the field programmable gate array 3 can obtain real-time video signals, which includes an interface for connecting with the LCD display interface and the above-mentioned mixed display system of graphics, text and real-time video.
Because the MCU and the LCD or the Field Programmable Gate Array (FPGA)3 can be connected through the selection resistor 2, when the MCU1 and the Field Programmable Gate Array (FPGA)3 are connected, the video real-time acquisition device and the LCD display interface can be connected through the Field Programmable Gate Array (FPGA)3, so that the selection of the video screen function is realized, and the MCU1, the selection resistor 2 and the field programmable gate array 3 can be integrated on the PCB 4 to improve the integration level and the functionality of the device due to the rotation of the video function.
Furthermore, as shown in fig. 2, the present patent further discloses a system for compatible video function and mixed image-text video display, which is a device for compatible video function and mixed image-text video display, and the device for compatible video function and mixed image-text video display is connected to the LCD display interface 6 and the video capture device 5, wherein the video capture device 5 includes a camera 51 and a video AD conversion chip 52 for converting camera signals into BT656 format data of 54M clocks, and the video AD conversion chip 52 is connected to the field programmable gate array 3.
When the video RGB signals and the image RGB signals need to be displayed in a mixed mode, the FPGA displays the video RGB signals and the image RGB signals according to the mixed display method.
When the video RGB signals and the image RGB signals do not need to be mixed and displayed, the FPGA directly analyzes the video RGB signals and then sends the video RGB signals and the LCD control signals to an LCD display interface for displaying.
The invention has various embodiments, and all technical solutions formed by adopting equivalent transformation or equivalent transformation are within the protection scope of the invention.

Claims (1)

1. The mixed display method of the image-text and the real-time video is characterized in that: the device is used for being compatible with the video function and the image-text video mixed display, and is connected with the LCD display interface (6) and the video acquisition device (5); the device compatible with the video function and the image-text video mixed display comprises an MCU (1) and a field programmable gate array (3), wherein the MCU (1) comprises a selection resistor (2) used for being connected with an LCD display interface or the field programmable gate array (3), the MCU (1), the selection resistor (2) and the field programmable gate array (3) are integrated on a PCB (4), the video acquisition device (5) comprises a camera (51) and a video AD conversion chip (52) used for converting camera signals into BT format data, and the video AD conversion chip (52) is connected with the field programmable gate array (3); the field programmable gate array (3) comprises an image-text and real-time video mixed display system, and the image-text and real-time video mixed display system performs display control of an LCD according to the following steps:
s1, receiving LCD control signal sent by MCU and image RGB signal formed by icon, character and background, and real-time video signal sent by video AD conversion chip; the image RGB signal is formed by drawing a GUI application function and comprises a group of pixel points matched with the pixel points of the LCD, and the color value of each pixel point of the image RGB signal meets the condition that the value of the Green color is |0x01 or the value of the Green color is &0xFE or the value of the bulb color is |0x 01;
s2, decoding and integrating the real-time video signal into a video RGB signal with the same clock as the clock signal of the LCD;
s3, mixing the video RGB signal of the appointed frame and the corresponding frame image RGB signal by using the clock of the LCD control signal as the driving source, which at least includes the following steps
S31, analyzing the video RGB signals, and forming video image RGB signals matched with the resolution of the LCD through operational amplification and multi-channel video combination;
s32, determining whether the RGB value of each pixel point sent to the LCD is the RGB value of the pixel point corresponding to the RGB signal of the video image, or the RGB value of the pixel point corresponding to the RGB signal of the image, or the RGB value weighted and calculated by the RGB signal and the pixel point by judging the pixel value of each pixel point of the RGB signal of the image;
s321, judging the value of the lowest bit of the Green color and the value of the lowest bit of the Blue color of each pixel point of the image RGB signal according to the time sequence;
s322, when the lowest bit of the Green color of a certain pixel point of the image RGB signal is judged to be 1, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal;
s323, when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 0, determining the RGB value sent to the corresponding pixel point on the LCD as the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal;
s324, when the lowest position of the Green color of a certain pixel point of the image RGB signal is judged to be 0 and the lowest position of the Blue color is judged to be 1, determining the RGB value sent to the corresponding pixel point on the LCD as the weighted value of the RGB value of the pixel point corresponding to the pixel point on the LCD in the video image RGB signal and the RGB value of the pixel point corresponding to the pixel point on the LCD in the image RGB signal;
and S4, outputting the RGB value of each pixel point to be sent to the LCD and the LCD control signal to the LCD display interface.
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