CN112689134B - Information display terminal with trapezoidal correction for airborne cargo compartment - Google Patents
Information display terminal with trapezoidal correction for airborne cargo compartment Download PDFInfo
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Abstract
The invention provides an information display terminal with trapezoidal correction for an airborne cargo compartment, which comprises a video acquisition module, a trapezoidal correction module, a video output module, a communication processing module, a first communication control module, a second communication control module and a DLP projection module. The invention realizes the automatic correction of the trapezoidal distortion of the image, solves the problems of high cost or reduced projection imaging image quality and the like easily caused by the prior art, and has the characteristics of strong flexibility, good real-time property, small volume, low power consumption, portability and the like.
Description
Technical Field
The present disclosure relates to the field of projection technologies, and in particular, to an information display terminal with trapezoidal correction for an onboard cargo space.
Background
With the development of information technology, especially the popularization of network communication technology and multimedia technology, the frequency of using projectors is higher and higher. Projection technology is increasingly used in important fields, such as airborne cargo space information management systems. However, due to the influence of factors such as the placement position, distance, and angle of the information display terminal, the displayed image is often distorted, and the image quality is reduced due to the fact that the image is trapezoidal, so that how to perform trapezoidal correction on the projection display image and improve the quality of the projection display image are being researched more and more.
At present, the keystone correction of the projection display technology generally has two methods, namely optical keystone correction and digital keystone correction. The optical trapezoidal correction achieves the purpose of adjusting the trapezoid by adjusting the physical position of the lens, also called as a shift axis, and like a shift axis lens of a camera, the correction method has no influence on the physical pixels of the picture, and the result basically does not change the quality of the picture, so the optical trapezoidal correction is suitable for application with higher requirements on image precision and has the defect of higher equipment cost; the digital trapezoidal correction is realized by a software method. The method usually uses a software interpolation algorithm to scan the line or field of the display screen, and then adjusts and compensates according to the scanning amplitude, thereby achieving the aim of correction. The correction amplitude is more than +/-15 degrees, and the vertical and the left and the right omnibearing processing can be carried out, namely, vertical trapezoidal correction and horizontal trapezoidal correction. The disadvantage is that the picture is compressed, which may bring the degradation of picture quality; after the image is corrected, burrs and unsmooth phenomena can occur on the edges of lines and characters of the picture, so that the definition is not particularly ideal.
Disclosure of Invention
In view of this, the embodiment of the present disclosure provides an information display terminal with keystone correction for an onboard cargo space, which implements automatic correction of keystone distortion of an image, so as to solve the problems in the prior art that the cost is high or the image quality of a projection image is degraded.
In order to achieve the above purpose, the invention provides the following technical scheme:
an information display terminal with trapezoidal correction for an airborne cargo hold comprises a video acquisition module, a trapezoidal correction module, a video output module, a communication processing module, a first communication control module, a second communication control module and a Digital Light Processing (DLP) projection module;
the video acquisition module is used for receiving an externally input optical fiber video signal, performing video format conversion and outputting a digital video signal to the trapezoidal correction module;
the trapezoidal correction module is used for receiving the digital video signals output by the video acquisition module, completing trapezoidal correction in the vertical direction or the horizontal direction and outputting digital video signals corrected into a standard rectangle;
the video output module is used for outputting the video signal after the trapezoidal correction and providing an output video time sequence;
the communication processing module is used for processing the picture adjusting instruction and the trapezoidal correction mode transmitted by the external upper computer and the data transmitted by the DLP projection module;
the first communication control module is used for receiving a picture adjusting instruction transmitted by an external upper computer, controlling the information display terminal to adjust the picture, and simultaneously transmitting a trapezoidal correction mode to enable the trapezoidal correction module to correct deformity according to trapezoidal correction mode information;
the second communication control module is used for transmitting the picture adjusting instruction to the rear-end DLP projection module and controlling the information display terminal to adjust the picture;
and the DLP projection module is used for projecting the image signal after performing digital processing.
Further, the device also comprises a storage module, wherein the storage module is used for storing the trapezoidal correction mode information.
Further, the memory module comprises a piece of serial electrically erasable programmable read only memory.
Further, the picture adjusting instruction comprises day and night mode switching, brightness increasing and decreasing, menu bar calling, exiting and moving.
Furthermore, the input resolution of the video acquisition module is 1600 × 1200@60Hz, and the clock pixel is 162 MHz.
Further, the video capture module may capture the digital video signal in a single pixel or in a dual pixel.
Further, the keystone correction module includes a programmable logic device.
Further, the trapezoidal correction module may perform corresponding interpolation processing according to the trapezoidal correction mode transmitted by the second communication control module.
Further, the video output module may output a video signal with a single pixel or with two pixels.
Furthermore, the communication processing module has 10 ten thousand erasing and writing cycles and 40 years of data retention capacity.
Furthermore, the first communication control module adopts an RS422 communication protocol, and realizes asynchronous full-duplex serial communication at a transmission rate of 19200 bps.
Further, the second communication control module adopts an RS422 communication protocol, and adopts asynchronous full-duplex serial communication, wherein the transmission rate is 115200 bps.
Further, the DLP projection module includes a monolithic digital Micromirror device dmd (digital Micromirror device).
The invention discloses an information display terminal with trapezoidal correction for an onboard cargo hold, which has the beneficial effects that: the external optical fiber video signal is decoded into a digital video signal by the optical fiber conversion module and sent to the programmable logic device, the trapezoidal correction mode information transmitted by an external upper computer is corrected, a standard rectangular picture is output for projection display, meanwhile, the operations of day and night mode switching, brightness addition and subtraction, menu bar calling, exiting, moving and the like of the information display terminal can be adjusted, and finally, the trapezoidal correction mode is stored in the programmable read only memory so as to be convenient for using the configuration information adjusted last time when the information display terminal is electrified next time.
Moreover, as an information display terminal with trapezoidal correction for an onboard cargo hold, the invention has the characteristics of strong flexibility, good real-time property, small volume, low power consumption, portability and the like, can simultaneously display important information such as an entry direction of an paratrooper, a wind speed of a landing field, a flight altitude of an airplane, a task monitoring picture, a digital map, an airdrop and airdrop time sequence command and the like, and can play multimedia information.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic block diagram of an information display terminal with trapezoidal correction for an onboard cargo space according to an embodiment of the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
The disclosed embodiment provides an information display terminal with trapezoidal correction for an onboard cargo compartment.
Referring to fig. 1, the information display terminal with trapezoidal correction for an onboard cargo compartment includes a video acquisition module, a trapezoidal correction module, a video output module, a storage module, a communication processing module, a first communication control module, a second communication control module, and a DLP projection module.
In the video acquisition module, after the external input optic fibre video signal, send into optic fibre receiving and dispatching integrative module and carry out optic fibre video signal's collection to convert DVI video signal into and send into DVI decoder circuit and decode, convert digital video signal output behind DVI decoder circuit. The resolution of the externally input optical fiber video signal is not higher than 1600 multiplied by 1200@60Hz, and the clock resolution is 162 MHz. The optical fiber receiving and transmitting integrated module uses an optical fiber video decoding circuit of the middle-navigation photoelectric technology, namely the GmbH, and each channel of the circuit can provide a transmission rate of up to 3.125 Gbps; the DVI decoding module uses a video decoding circuit chip of TI company, the video decoding circuit supports DVI video signal input with maximum resolution of 1600 multiplied by 1200@6OHz, and real-time acquisition is completed.
In the trapezoidal correction module, the trapezoidal correction mode information transmitted by the communication processing module is used for correspondingly correcting the trapezoidal picture to obtain a corrected standard rectangular picture. In this embodiment, the input fiber video source is in 1080P format, the angle to be corrected is 15 °, and the keystone correction is performed in the vertical direction. A video source with a frame 1080P format has a resolution of 1920 x 1080@60Hz, and forms a trapezoid with 1920 pixels at the upper bottom, 1380 pixels at the lower bottom and 1080 pixels at the height according to a correction angle. From top to bottom, starting from the first row, the effective pixels of each row are gradually increased downwards according to the rule that every four rows have two more pixels (one more pixel at the head and the tail) so as to ensure the trapezoidal shape. According to the trapezoid correction mode information (wherein 000 represents the effective pixel, the effective pixel is directly displayed; 001 represents that the effective pixel is discarded; 010 represents that the left pixel is copied; 011 represents that the right pixel is copied; 100 represents that the upper pixel is copied; and 101 represents that the lower pixel is copied) transmitted by the communication processing module, the trapezoid deformed picture is corrected into a standard rectangular picture and is output.
The video output module provides video time sequence and outputs the video signal after the trapezoidal correction without limiting the output video format.
The storage module comprises a piece of serial electrically erasable programmable read-only memory for caching the trapezoidal correction mode information. The read-only memory uses a serial EEPROM of Shenzhen national microelectronics shares Limited, and has the functions of a double-wire serial interface, data transmission protection, high reliability, key destruction during power failure and the like.
In the communication processing module, the picture adjusting instruction and the trapezoidal correction mode transmitted by an external upper computer are processed, and partial information, such as day and night mode instruction, brightness instruction, self-checking command, menu adjusting instruction and the like, is transmitted to the second communication control module; part of the information, such as the trapezoidal correction information, is passed to the trapezoidal correction module. Meanwhile, feedback information transmitted by the rear-end DLP projection module is processed, and information in the feedback information, such as day and night mode, brightness information, self-checking information and the like, is fed back to the first communication control module.
And the first communication control module receives a picture adjusting instruction and trapezoidal correction mode information transmitted by an external upper computer and simultaneously feeds back corresponding self-checking information. The external upper computer transmits communication data through an RS422 bus, the first communication control module analyzes an RS422 communication protocol, analyzes a day and night mode instruction, a brightness adding and subtracting instruction, a self-checking command, a menu adjusting instruction and trapezoidal correction mode information in the RS422 communication protocol, and transmits the information to the communication processing module; meanwhile, self-checking information required by the external upper computer is coded into an RS422 format and transmitted to the external upper computer.
In the second communication control module, the instruction information is encoded into an RS422 format and transmitted to the DLP projection module, and meanwhile, the self-checking information fed back by the DLP projection module is received. The DLP projection module transmits communication data in an RS422 format, and the second communication control module analyzes an RS422 communication protocol fed back by the DLP projection module and transmits day and night modes, brightness information, self-checking information and the like to the communication processing module; meanwhile, various instructions transmitted by the upper computer are encoded into an RS422 format and transmitted to the DLP projection module.
In the DLP projection module, a DMD (digital micromirror device) which is a system core is used as a projection display device to generate high-quality and high-gray-scale images for projection imaging.
The invention realizes an information display terminal with trapezoidal correction for an airborne cargo compartment, supports the input of optical fiber video signals, corrects trapezoidal distortion images in the vertical direction or the horizontal direction by receiving a trapezoidal correction mode transmitted by an external upper computer to obtain standard rectangular picture output, and finally completes projection display; by receiving the picture adjusting instruction, the output picture is subjected to day and night mode switching, brightness addition and subtraction, menu bar calling, exiting, moving and the like. And finally, storing the trapezoidal correction mode and the picture adjusting instruction in a storage device of the information display terminal, and ensuring that the last configuration information is kept after the power is supplied again.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (7)
1. An information display terminal with trapezoidal correction for an airborne cargo compartment is characterized by comprising a video acquisition module, a trapezoidal correction module, a video output module, a communication processing module, a first communication control module, a second communication control module and a DLP projection module;
the video acquisition module is used for receiving an externally input optical fiber video signal, performing video format conversion and outputting a digital video signal to the trapezoidal correction module;
the trapezoidal correction module is used for receiving the digital video signals output by the video acquisition module, completing trapezoidal correction in the vertical direction or the horizontal direction and outputting digital video signals corrected into a standard rectangle;
the video output module is used for outputting the video signal after the trapezoidal correction and providing an output video time sequence;
the communication processing module is used for processing the picture adjusting instruction and the trapezoidal correction mode transmitted by the external upper computer and the data transmitted by the DLP projection module;
the first communication control module is used for receiving a picture adjusting instruction transmitted by an external upper computer, controlling the information display terminal to adjust the picture, and simultaneously transmitting a trapezoidal correction mode to enable the trapezoidal correction module to correct deformity according to trapezoidal correction mode information;
the second communication control module is used for transmitting the picture adjusting instruction to the rear-end DLP projection module and controlling the information display terminal to adjust the picture;
the DLP projection module is used for projecting the image signal after performing digital processing;
the picture adjusting instruction comprises day and night mode switching, brightness increasing and decreasing, menu bar calling, exiting and moving;
the device also comprises a storage module, a processing module and a processing module, wherein the storage module is used for storing the trapezoidal correction mode information;
the trapezoidal correction module can perform corresponding interpolation processing according to the trapezoidal correction mode transmitted by the second communication control module;
the trapezoidal correction module directly displays 000 effective pixels according to trapezoidal correction mode information transmitted by the communication processing module; 001 denotes discarding the valid pixel; 010 denotes copying the left pixel; 011 denotes copying the right pixel; 100 denotes the copy upper pixel; 101 denotes copying the lower pixels and correcting the trapezoid-shaped deformed picture to the standard rectangular picture for output.
2. The information display terminal with keystone correction for an onboard cargo space of claim 1 wherein the memory module comprises a piece of serial electrically erasable programmable read only memory.
3. The information display terminal with keystone correction for an airborne cargo bay of claim 1 wherein the video capture module has an input resolution of 1600 x 1200@60Hz and a clock pixel of 162 MHz.
4. The information display terminal for an onboard cargo tank having keystone correction as set forth in claim 1 wherein said keystone correction module comprises a programmable logic device.
5. The information display terminal with keystone correction for an airborne cargo tank of claim 1 wherein the first communication control module employs RS422 communication protocol, asynchronous full duplex serial communication, transmission rate 19200 bps.
6. The information display terminal for an airborne cargo compartment having keystone correction as set forth in claim 1 wherein said second communication control module employs RS422 communication protocol, asynchronous full duplex serial communication, and has a transmission rate of 115200 bps.
7. The information display terminal with keystone correction for airborne cargo space of claim 1 wherein said DLP projection module comprises a monolithic Digital Micromirror Device (DMD).
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| CN202011520739.7A CN112689134B (en) | 2020-12-21 | 2020-12-21 | Information display terminal with trapezoidal correction for airborne cargo compartment |
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| CN202011520739.7A CN112689134B (en) | 2020-12-21 | 2020-12-21 | Information display terminal with trapezoidal correction for airborne cargo compartment |
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| CN100394300C (en) * | 2005-12-15 | 2008-06-11 | 南京大学 | Trapezoidal correcting system for projector |
| JP5832119B2 (en) * | 2011-04-06 | 2015-12-16 | キヤノン株式会社 | Projection apparatus, control method thereof, and program |
| CN103686028A (en) * | 2013-11-29 | 2014-03-26 | 浙江大学 | Video pixel alternate interpolation method for large-screen and multi-projection system |
| CN210323741U (en) * | 2019-09-29 | 2020-04-14 | 长沙湘计海盾科技有限公司 | Projection system with night vision function |
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