WO2012068784A1

WO2012068784A1 - Synchronization method for displaying mixed signals of stereoscopic and flat image signals on ultra large screen

Info

Publication number: WO2012068784A1
Application number: PCT/CN2011/070097
Authority: WO
Inventors: 林春育; 高川; 魏新刚; 党甲武
Original assignee: 深圳市创凯电子有限公司
Priority date: 2010-11-25
Filing date: 2011-01-07
Publication date: 2012-05-31
Also published as: CN102075773A; CN102075773B

Abstract

A synchronization method for displaying mixed signals of stereoscopic and flat image signals on ultra large screen, involves: receiving different stereoscopic signals format inputs, decoding into flat signals format which alternatively emerges between left and right eye, and generating a frame synchronous signals to mark a left eye frame and a right eye frame; respectively overlying the left eye frame signals and right eye frame signals of different stereoscopic signals, respectively overlying the left eye signals and right eye signals with flat signals, combining the overlain signals with the frame synchronous signals; intercepting a corresponding part image with a image controller and generating overlapping areas and mixed zones and outputting to the display device by referring to the frame synchronous signals, generating a signal for controlling a liquid crystal valve to open and close corresponding to the synchronous signal of each frame, and outputting the stereoscopic synchronous signal by an infrared transmitter.

Description

Synchronization method for stereo and planar image mixed signals on large screen

Technical field

The invention relates to a large screen developing technology, which mainly relates to a method for synchronizing the stereo and planar image mixed signals on a large screen by controlling the liquid crystal shutter switch glasses through the edge fusion image controller.

Background technique

In the field of command and control center, industrial design simulation, it requires beautiful large screen, pure color, high-resolution display effect, especially when displaying large screens or large-area screens, especially multiple different signals at the same time on a large screen. When performing display, an image controller with edge blending technology is required. The edge blending technology that has emerged in recent years is a new seamless stitching technology that can better improve the visual effect of stitched images.

Edge blending technology is to overlap the edges of a group of projectors and display a whole picture with no gaps, brighter, larger and higher resolution through fused image processing technology. The effect of the image is like one. The quality of the projector's projection. When two or more projectors are combined to project a picture, some of the image lights overlap. The main function of the edge fusion is to gradually reduce the brightness of the overlapping parts of the two projectors, so that the brightness of the whole picture is consistent. . The whole picture composed of edge blending technology has the following performance advantages: I. Increase the image size, which can form a large-area display screen. The images projected by multiple projectors can form an infinite display area and maintain the whole picture. The perfection and consistency of color. 2. Increase the resolution of the display. The resolution of the displayed image is the sum of the resolutions after each projection is subtracted from the overlapped area pixels.

The large screen completed by the edge blending technology eliminates the physical gap between the screens of the traditional large screen stitching because of the whole screen, so that the screen display image remains intact, and the optical gap is eliminated, and the terrain is displayed. Maps, pipeline diagrams, and simulation information ensure the integrity and aesthetics of the displayed image.

Edge-blended image controller is the core that realizes multiple channels of different signals to display seamless widescreen on a large screen. Image control processing device. It has the functions of edge blending processing of external image signals, multiple input source selection, seamless switching, image processing, signal window manipulation, etc. It can meet the simultaneous display of multiple windows supporting multiple signals to seamlessly blend widescreen signals. The image controller includes image data copying, generating overlapping projection areas, edge feathering of overlapping images, acquisition of external image signals, scaling, window manipulation, signal source selection, and the like. The large-screen display system with the edge-blended image controller as the core can realize the following functions: (1) multiple video signal inputs (including planar images and stereo image signals), and the image controller can be configured as multiple signal sources according to the system. Input, one input can be processed at high resolution. Sources include: VGA, Video and DVI, HD K SD, HI) SDI and more. (2) Multiple channel signal output, the image controller can set the number of output channels according to the number of projectors that need to be supported. (3) Effect control on various signals includes: window manipulation, image scaling, edge blending, and the like.

At present, the stereoscopic display technology can be divided into two types: the naked-view viewing and the glasses-type viewing. The naked-view stereoscopic display allows the viewer to enjoy the stereoscopic effect because no additional equipment is needed, and is generally welcomed by consumers. With the attention of manufacturers, the naked-eye stereo technology is the development direction of 3D display technology, but the development of naked-eye display technology is still immature. The glasses-type stereo display technology has developed earlier, and the solution is relatively mature. The specific technology can also be divided into: spectral type, passively polarized light type, active shutter type and so on. The glasses-type visualization of stereoscopic images requires the wearing of specific glasses, such as spectroscopic lenses with different lenses, passively polarized lenses with circularly polarized or linearly polarized lenses, and active shutters with liquid crystal switch shutter glasses.

The principle of stereo imaging is to use two cameras to simulate the principle of observing things by human eyes. Two pictures with slightly different viewing angles are output to the two eyes of the person during playback, and the technical method ensures that during playback, the left side The picture taken by the camera only enters the viewer's left eye, and the picture taken by the right camera only enters the viewer's right eye, allowing the viewer's two eyes to view only the defined picture, thus forming a stereoscopic view in the viewer's mind. Vision.

Active shutter stereoscopic display technology, also known as split-shading or liquid crystal time-sharing technology, is mainly realized by the characteristics of liquid crystal glasses. The liquid-crystal glasses are two LCD screens that can be separately controlled to open and close, and the normal display is transparent. State, it will turn black after power-on. When transmitting an infrared control signal through a special signal transmitting device, the liquid crystal glasses are receiving When such a control signal is applied, the transparency and opacity of the lens are controlled by energization to achieve the purpose of blocking an eye, and the content of the stereoscopic signal to be played is turned black when the left eye picture is played, and vice versa. When the right eye picture signal is played, the left eye lens of the liquid crystal glasses is turned black and turned off, thereby achieving accurate synchronization between the stereoscopic playback content and the viewer's eyes, and achieving the visual effect of stereoscopic imaging.

When the composite stereo signal is played, the signals of the left and right eye images appear alternately on the display screen. When the left screen is played, the left lens of the liquid crystal glasses is opened, the right lens is closed, and the left eye of the viewer sees the picture that needs to be seen by the left eye, the right eye. Nothing can be seen. When the right eye screen is played, the right lens of the LCD glasses is opened, the left lens is closed, and the left eye does not see the screen, so that the left and right eyes respectively see the left and right respective images, thereby achieving a 3D stereoscopic effect. This control alternation process can only ensure that the single-eye receiving frequency is not lower than 60Hz to achieve a coherent and flicker-free stereoscopic picture when the control alternation process is only 120 times/second or more. Therefore, the active 3D display technology requires at least a refresh rate of the signal output. Up to 120Hz

The stereo signal source is the basis for realizing the stereoscopic display system. The general stereo signals are divided into two types, a composite stereo signal and a separate stereo signal. The composite stereo signal refers to a stereo video signal including left eye information and right eye information. Different information is separated by frame, the odd frame is the left eye, the even frame is the right eye signal, and the signal content is played by the left and right eyes alternately. Separating signals means that each image consists of two independent video signals, that is, two stereo signals, one is a video signal containing only left-eye information, and the other is a video signal containing only right-eye information. When playing a separate signal, two different signal files are played simultaneously.

The basic principle of using the liquid crystal shutter switch mode to realize stereoscopic display is as follows: The signal source adopts a composite stereo signal with left and right eye information intervals. When the stereo signal is played, the playback device transmits the infrared frame through the infrared transmitter when playing the odd frame left eye signal. The identification signal of the left eye content, when the liquid crystal shutter switch glasses receive the infrared signal, the eye piece of the right eye is closed, and only the signal enters the left eye through the glasses. Similarly, when the playback device plays the right eye signal of the even frame, the infrared device passes the infrared signal. The transmitter transmits an identification signal of the content of the right eye, and the liquid crystal shutter closes the glasses of the left eye when receiving the right infrared signal, and only allows the signal to enter the right eye through the glasses, so that the left and right eye signals respectively enter the left eye. And the right eye is self-contained to achieve a stereoscopic effect. In high-end simulation design, terrain display and other applications, it is often necessary to display multiple external image signals on a large screen composed of multiple projectors while being compatible with displaying stereo signals, that is, a planar image signal appears simultaneously on the entire large screen. And stereo image signals. This functional requirement often requires the image controller to process both the control plane image signal and the display and control stereo image signals, and organically combine the two signals into a complete large screen.

In a system in which a whole planar stereo signal is mixedly displayed, the image controller processes both the planar signal and the stereo signal. If the external stereo input signal is a composite stereo signal, in order to ensure that the viewer can have a three-dimensional experience, the entire system must also have a device for controlling the synchronization signal of the liquid crystal shutter to ensure synchronous control of the stereo signal.

In a large-screen system with a mixed display of planar stereo signals, active shutter-type stereoscopic imaging is realized by transmitting an identification signal between an integrated stereoscopic signal playing device and a liquid crystal shutter switch glasses through an infrared transmitter. At present, the infrared transmitter transmits a stereoscopic identification signal to control the liquid crystal switch glasses by: A) controlling the infrared emitter by playing a computer with a composite stereo signal; this mode is playing the device (often a computer) while playing the composite stereo signal content. The infrared stereo synchronization control signal of the transmission shutter switch is controlled by a specially configured infrared emitter. This way of mode control: the transmission of the synchronization signal, the limitation is: when supporting a seamless large screen composed of multiple projectors, the computer used to play the composite stereo signal does not have enough processing plane and stereo signals. The resources and capabilities to complete the edge-related technology to achieve seamless integration of large screens, that is, the computer used to play stereo signals can only support the display and synchronization control of a projector, can not achieve the plane and on the edge of the fusion large screen Mixed display of stereo signals. B) controlling the infrared signal of the transmitting shutter switch by a projector that receives the composite stereo signal. That is to say, the infrared transmitter is configured by a special port specially designed by the projector, and the stereo synchronous signal is emitted while the projector is playing the stereo signal, and the synchronous signal is serially transmitted through multiple projectors when the large screen is displayed. Realizing the synchronous control of the stereo signal can meet the requirements of the edge-blended large screen composed of multiple projectors, and can also realize the display of the active stereo signal. However, the limitation of this method is that: the stereo signal and the plane signal cannot be processed at the same time, that is, the plane signal and the stereo signal cannot be mixed and displayed on a large screen, and can only be displayed by switching between different scenes in two different states. When a stereo signal is displayed, the flat signal cannot be displayed at the same time, and vice versa. In high-end simulation applications, it is often necessary to display not only a single stereoscopic picture or multiple planar signal pictures on a large screen composed of multiple projectors, but also to simultaneously display planar signals and stereo signals on the entire large screen. Under the demand of this application, the stereo signal developed by the A mode is limited by the processing capability of the computer that plays the stereo signal, and the size of the display screen is relatively small, and often only one projection can be used to display a limited space. Although the B mode can realize stereoscopic display of a large plane, it is not possible to simultaneously process multiple signal planes or simultaneous display of stereo signals.

The method of controlling the active stereo synchronous infrared signal transmission on the edge fusion image controller can meet the requirements of constructing a large screen composed of multiple projectors, and at the same time can meet the technical requirements of simultaneous display of multiple planar and stereo signals. The synchronization mode of the transmission signal display determines the functions that can be realized by the whole system. It is necessary to satisfy the large screen composed of multiple projectors for the screen content to be displayed, and also to display compatible display of multiple different screen signals and stereo signals. It is also necessary to maintain the synchronous control of the stereo signal and the liquid crystal shutter. Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a novel synchronization control method for developing a stereo and planar image mixed signal on an oversized screen. In a large screen wall composed of multiple projectors, different projectors display different parts of the overall picture, and complex processing of all input image signals is required, including acquisition, scaling, and superposition of plane signals of different resolutions, and then dividing into screens. The different positions are output with edge blending techniques. The related work on image processing is completed by the edge-blending image controller. Therefore, the edge-blending image controller is used to transmit the synchronous signal control of the active stereo composite signal, which is an effective way in high-end simulation applications. The method can process multiple planes and composite stereo signals to meet the problem of mixed display of multiple planar stereo signals, and complete the output of the edge fusion technology to realize large screen display, and the stereo synchronization signal of the infrared emitter driven by the device. It also ensures that the stereo signal is fully displayed anywhere on the entire large screen.

The method for realizing the invention is: the image acquisition unit collects the stereo signal and the plane signal of different formats, converts the stereo signals of different formats into one frame left eye, and a plane signal alternately appearing in the right eye of one frame, and transmits the signal to the stereo peer processing. The stereo input port of the unit, the plane signal is input to the plane input port, the stereo synchronization processing unit changes the size and position of the signal according to the preset setting, and the left eye signal and the left eye signal, the right eye signal and the right eye between different stereo signals are The signals are superimposed separately, and the left eye signal of the stereo signal is superimposed with the plane signal, the right eye signal and the plane signal, respectively. The superimposed signal is transmitted to the image fusion unit in combination with the frame synchronization signal, and the different output units in the image fusion unit intercept the phase 5 partial image and generate the coincidence region and the fusion band reference frame synchronization signal to be synchronously output to the display device. The stereo synchronization control unit generates a synchronization signal for controlling the liquid crystal shutter switch according to the frame synchronization signal, and outputs a stereo synchronization signal through the infrared emitter.

The device for implementing the present invention is: comprising an image acquisition unit, a stereo synchronization processing unit, an image fusion unit and a stereo synchronization control unit connected in sequence, wherein the image acquisition unit converts the collected stereo signals of different external formats.

10 is replaced by a planar signal, and combined with the frame synchronization signal is transmitted to the stereo synchronization processing unit, and the stereo synchronization processing unit receives; the different image stereo signals and the planar signals change the size and position of the signal according to the preset, and are combined with the frame after superposition. The signal is transmitted to the image fusion unit, and the image fusion unit intercepts the corresponding partial image by different output units and generates the coincidence region and the fusion frame reference frame synchronization signal to be synchronously outputted to the display device, and the stereo synchronization control unit converts the frame synchronization signal into the infrared of the liquid crystal shutter switch. control signal.

The invention has the beneficial effects that the method of outputting the control signal to the liquid crystal shutter switch by the image controller can achieve the following effects: 1) The super-large plane image of the active stereo signal can be displayed. Different from the way of controlling by computer, because the output resolution of the computer is limited, if the active stereo signal picture of the large plane is to be displayed, the original picture needs to be cut and enlarged, so that the synchronization between the partial pictures is difficult to control. The resulting picture often 'can't produce a stereo effect. This method generates a synchronization mode by the image controller. Since the function of the image controller is to process the externally input signal, a large-scale display screen is constructed, and the synchronous control signal is sent at the same time as the output, which can satisfy At the same time as the large screen is displayed, synchronous control of the stereo signals is realized. 2) Multiple planar or stereo signals can be processed simultaneously. Different from the way to send a synchronization signal through the projector, when displaying multiple signal contents, the computer needs to process and output the external signal, and the synchronous output of the projector cannot control the external digital analog signal collected by the image controller, including the stereo signal. This method completes the stacking inside the image controller After the force P, scaling, and segmentation processing, the partial image signals of the large picture are segmented to form a complete picture, and the synchronous control of the signal content involving the active stereo is controlled by infrared direct transmission to control the liquid crystal shutter glasses at the same time of outputting. That is to say, it is possible to process a plurality of plane signals at the same time, and at the same time, synchronous display of the composite stereo signals can form a super-large resolution or a large-area picture. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the overall principle of the present invention. Figure 2 is a block diagram of signal processing of the image acquisition unit of Figure 1. 3 is a signal processing diagram of the stereo synchronization processing unit of FIG. 1, showing two stereo signals in a multi-channel stereo signal. - Figure 4 is a signal processing diagram of the stereo synchronization processing unit of Figure 1, showing one stereo signal and one channel signal in the multi-channel stereo signal. FIG. 5 is a signal processing diagram of the stereo synchronization signal generating unit of FIG. 1, wherein 5a is a frame synchronization signal, and 5b is an infrared waveform of a certain type of liquid crystal switching glasses. In the figure: 1 image acquisition unit, 2 stereo synchronization processing unit, 3 image fusion unit, 4 stereo synchronization signal generation unit, 5 left eye, 6 right eye, 7 stereo signals of various formats. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to the accompanying drawings: The synchronization method of the present invention is: receiving different stereo signal format inputs, and decoding into a planar signal format in which left and right eyes alternately appear, simultaneously producing The frame sync signal is used to mark the left eye frame and the right eye frame;

The left eye frame and the right eye frame signal between different stereo signals are respectively superimposed, and the left eye frame signal of the stereo signal and the plane signal, the right eye frame signal and the plane signal are respectively superimposed, and the superposed signal is combined with the frame synchronization signal; The image controller intercepts the corresponding partial image and generates a coincidence region and the fusion band reference frame synchronization signal to synchronously output to the display device, and generates a signal for controlling the liquid crystal shutter switch by the synchronization signal of each frame, and outputs a stereo synchronization signal through the infrared emitter.

As shown in the figure, the overall principle block diagram of the present invention is shown in Fig. 1, and includes an image acquisition unit 1, a stereo synchronization processing unit 2, an image fusion unit 3, and a stereo synchronization control unit 4. The image acquisition unit 1 collects an external input signal. When the collected signal is a stereo signal, the stereo signal of different formats is converted into a frame left eye, a frame right eye alternate plane signal combined with the frame synchronization signal, and transmitted to the stereo synchronization processing unit 2 . The stereo synchronization processing unit 2 receives the different image stereo signals and the planar signals according to the size and position of the preset change signals, and superimposes the left eye signals and the left eye signals, the right eye signals and the right eye signals between the different stereo signals. The left eye signal of the stereo signal and the f-plane signal, the right eye signal and the plane signal are respectively superimposed. The superimposed signal is transmitted to the image fusion unit in combination with the frame synchronization signal, and the different output units in the image fusion unit intercept the corresponding partial image and generate the coincidence region and the fusion frame reference frame synchronization signal to synchronously output to the display device, and simultaneously generate the control liquid crystal according to the frame synchronization signal. The synchronization signal of the shutter switch outputs a stereo synchronization signal through the infrared emitter.

The image acquisition unit 1 can receive different stereo signal formats (Frame sequential, Frame packing, Side-by-side, Checkerboard, etc.) Input decoding is alternated for left and right eyes. The planar signal format, and the frame sync signal is generated to indicate the left eye frame and the right eye frame. The stereo synchronization processing unit 2 changes the size and position of the planar signal transmitted from the image collection unit 1, superimposes the signals of the different channels on each other, and outputs a frame synchronization signal to the image fusion unit 3.

FIG. 3 is a two-way stereo signal processing diagram of the stereo synchronization processing unit 2, and the multi-channel signal processing manner is the same. The stereoscopically converted left and right eye alternating plane signals, B and frame synchronization eight and B signals output by the image acquisition unit 1 are input to the stereo synchronization processing unit 2, and the stereo synchronization processing unit 2 extracts the stereoscopically converted left and right according to the frame synchronization A signal. The left-eye signal of the plane signal A alternating with the eye is superimposed with the left-eye signal of the plane signal B alternated by the stereo-converted left and right eyes according to the frame synchronization B signal to generate a large picture "C left eye", according to the frame synchronization A signal The right eye signal of the plane signal A alternated between the left and right eyes after the stereo conversion is extracted and the right eye signal of the plane signal B alternated by the left and right eyes extracted according to the frame synchronization B signal is superimposed to generate a large picture "C right eye" , "C left eye" and "C right eye" alternately output. Frame Synchronization The C signal selects one of the larger values of frame synchronization A and frame synchronization B.

4 is a three-dimensional synchronous processing unit 2 - way stereo signal one-way plane signal processing diagram, the multi-channel signal processing manner is the same. The plane signal B and the frame synchronization A signal, which are the plane signal B output from the image acquisition unit 1 and the left and right eyes after the stereo conversion, are input to the stereo synchronization processing unit 2. The stereo synchronization processing unit 2 extracts a left-eye signal of the left-eye alternating plane signal A after stereo conversion according to the frame synchronization A signal, and superimposes the plane signal B frame 1 to generate a large picture "C left eye" according to the frame synchronization A signal. The right eye signal of the left and right eye alternating planar signals 提取 is extracted and the planar signal B frame 1 is superimposed to generate a large picture "C right eye", and the next time stereoscopic processing unit 2 extracts according to the frame synchronization A signal. The left-eye signal of the plane signal A alternated by the left and right eyes is superimposed with the plane signal B frame 2 to generate a large picture "C left eye", and the plane signals of the left and right eyes alternately after the stereo conversion are extracted according to the frame synchronization A signal. The right eye signal of A is superimposed with the plane signal B frame 2 to generate a large picture "C The right eye ", "C left eye" and "C right eye" are alternately output. The frame synchronization C signal is the same as the frame synchronization A signal. Fig. 5 is a stereo synchronization signal generation unit 4 converting the frame synchronization signal into the infrared of the liquid crystal shutter switch The control number can change the waveform of the infrared control signal and control the glasses of different liquid crystal shutter switches.

Claims

Rights request

A synchronization method for displaying a stereo and planar image mixed signal on a large screen, comprising: a. receiving different stereo signal format inputs, and decoding into a planar signal format in which left and right eyes alternately appear, and simultaneously generating frames The sync signal is used to mark the left eye frame and the right eye frame;

b. superimposing the left eye frame and the right eye frame signal between different stereo signals, respectively, the left eye frame signal of the stereo signal and the plane signal, the right eye frame signal and the plane signal are respectively superimposed, and the superposed signal is combined with the frame synchronization signal. c through the image controller to intercept the corresponding part of the image and generate the coincidence area and the fusion band reference frame synchronization signal synchronous output to the display device, while generating a signal for controlling the liquid crystal shutter switch by the synchronization signal of each frame, and outputting the stereo through the infrared emitter Synchronization signal.