WO2019024210A1 - 屏幕自动拼接方法和屏幕自动拼接系统 - Google Patents

屏幕自动拼接方法和屏幕自动拼接系统 Download PDF

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Publication number
WO2019024210A1
WO2019024210A1 PCT/CN2017/103646 CN2017103646W WO2019024210A1 WO 2019024210 A1 WO2019024210 A1 WO 2019024210A1 CN 2017103646 W CN2017103646 W CN 2017103646W WO 2019024210 A1 WO2019024210 A1 WO 2019024210A1
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wireless communication
screens
signal
video
screen
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French (fr)
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鄢圣巍
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes

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  • the present invention relates to the field of video stitching processing.
  • the present invention relates to a screen automatic stitching method using wireless communication positioning technology and a screen automatic stitching system using the same.
  • the multi-screen splicing system commonly used in the market divides a video picture into a plurality of partial pictures, and each partial picture is displayed on a different screen in a predetermined order, thereby realizing a large screen display.
  • each screen and its supporting equipment in the multi-screen splicing system currently on the market are manually positioned and configured, and the process is cumbersome and inconvenient to maintain.
  • manual configuration takes a long time and is prone to configuration errors.
  • a screen fails during use and needs to be repaired or replaced, the entire system needs to be reconfigured.
  • the present invention is intended to provide an automatic screen splicing method with an automatic positioning function and an automatic screen splicing system using the same, thereby enabling quick installation configuration and convenient maintenance.
  • An automatic screen stitching method is disclosed according to an embodiment of the present invention.
  • the method is for a screen splicing system comprising a plurality of screens each provided with a wireless communication master device, the periphery of the plurality of screens being provided with a plurality of wireless communication slave devices.
  • the method includes the following steps:
  • Step S1 the wireless communication master device on each screen initiates scanning to identify and receive signals from the respective wireless communication slave devices;
  • Step S2 calculating a distance from each of the screens to each of the wireless communication slave devices according to the ranging information of the signals received by each of the wireless communication master devices;
  • Step S3 obtaining coordinates of each of the screens in a plane coordinate system according to the distance, and completing automatic positioning of each of the screens;
  • Step S4 dividing the video image into sub-video images corresponding to each of the screens according to the coordinates of each of the screens and performing allocation;
  • Step S5 Each of the screens displays a corresponding sub-video image, and each of the sub-video images is spliced to form the video image.
  • the ranging information is a signal strength when the wireless communication master receives a signal from each of the wireless communication slaves.
  • the wireless communication master device may be a Bluetooth master device
  • the wireless communication slave device is a Bluetooth slave device
  • the signal is a Bluetooth signal
  • each of the screens to the respective The distance of the wireless communication slave device is calculated by the following formula:
  • the RSSI is the Bluetooth signal strength when the Bluetooth master device receives signals from each of the Bluetooth slave devices
  • A is the Bluetooth signal strength when the Bluetooth slave device and the Bluetooth master device are separated by 1 meter
  • n is an environment.
  • the attenuation factor, abs, is an absolute value function.
  • the wireless communication master device may be a Zigbee master device
  • the wireless communication slave device is a Zigbee slave device
  • the signal is a Zigbee signal
  • each of the screens to each The distance of the wireless communication slave device is calculated by the following formula:
  • the RSSI is a Zigbee signal strength when the Zigbee master device receives signals from each of the Zigbee Bluetooth slave devices
  • A is a Zigbee signal strength when the Zigbee slave device and the Zigbee master device are separated by 1 meter
  • n is The environmental attenuation factor
  • abs is an absolute value function
  • the relative positional relationship of each of the screens in the horizontal direction and the vertical direction is obtained by the distance from each of the screens to each of the wireless communication slave devices, and according to the relative The positional relationship obtains the coordinates of each of the screens in a plane coordinate system.
  • the signal received by the wireless communication master device includes a MAC address of the wireless communication slave device that transmits the signal, and the wireless communication master device comes from the MAC address pair according to the Each of the wireless communication slave devices recognizes the signal.
  • the vertex coordinates of the image region are calculated according to the coordinates of each of the screens and the resolution of the video image, and the video image is divided into multiples according to the vertex coordinates.
  • the sub video image is calculated according to the coordinates of each of the screens and the resolution of the video image.
  • the screen splicing system includes: a video signal source, the video signal source provides a video signal of a video image; a video distributor, the video distributor receives the video signal, and divides and distributes the video image; Screens for displaying video images and arranged in a two-dimensional array, each of said screens being provided with a wireless communication master; a projector, said projectors being arranged in one-to-one correspondence with said screens, and The sub video image of the video distributor is projected to the corresponding screen; a plurality of wireless communication slave devices, the wireless communication slave device is disposed on a periphery of the two-dimensional array of the screen, and the wireless communication slave device continuously The ground emits signals.
  • the system is capable of performing the automatic screen stitching method as described above.
  • the system comprises four of said wireless communication slave devices located at four vertex angles of a two-dimensional array of said screens.
  • the automatic screen splicing method and the screen automatic splicing system according to the present invention realize automatic positioning of multiple screens and automatic segmentation of video images by utilizing, for example, Bluetooth positioning or Zigbee positioning wireless communication positioning technology, which is convenient to use and quick to install. , low maintenance costs.
  • FIG. 1 shows a schematic diagram of an automatic screen splicing system in accordance with an embodiment of the present invention.
  • FIG. 2 illustrates a schematic diagram of an example of multi-screen stitching of a video image.
  • FIG. 3 is a flow chart illustrating the main steps of a screen automatic stitching method in accordance with an embodiment of the present invention.
  • FIG. 4 shows a graph of a sub-video image area in accordance with an embodiment of the present invention.
  • 5 to 7 are schematic views showing a faulty screen replacement according to an embodiment of the present invention.
  • FIG. 1 shows a schematic diagram of a screen splicing system in accordance with an embodiment of the present invention.
  • the system is mainly used in application environments that require large video display, such as advertising walls, monitoring centers, dispatch centers, conference rooms, and showrooms.
  • the screen splicing system includes a video signal source (not shown), a video distributor 1, a projector 2, a projection screen 3, a wireless communication slave device 4, and a wireless communication master device 5 (see FIG. 5 to FIG. 7). ).
  • the projection screens 3 in the system are arranged on a wall or a bracket in a two-dimensional array according to design requirements, each screen displays different sub-video images, and all the sub-video images are spliced to form a complete video image, thereby realizing a large size.
  • Image display is arranged on a wall or a bracket in a two-dimensional array according to design requirements, each screen displays different sub-video images, and all the sub-video images are spliced to form a complete video image, thereby realizing a large size. Image display.
  • a screen automatic stitching system includes four projection screens 3A to 3D arranged in a 2 ⁇ 2 array. When it is not necessary to distinguish them, they may be collectively referred to as a projection screen 3.
  • the video source may be a video source such as a DVD, a video camera, a satellite receiver, a set top box, etc., and the video signal source can provide a video signal corresponding to the video image to be displayed.
  • the video distributor 1 receives the video signal transmitted from the signal source, and realizes division of the video signal according to automatic positioning processing on the screen, and generates a sub video signal corresponding to the number of screens 3.
  • the video distribution machine 1 transmits a sub video signal to each projector 2.
  • the projector 2 is disposed in one-to-one correspondence with the projection screen 3, and respectively projects sub-video images corresponding to the sub-video signals onto the corresponding projection screen 3.
  • the sub video images displayed on each projection screen 3 are stitched together to form a complete video image.
  • An example of splicing a sub-video image on the four projection screens 3 shown in FIG. 1 to form a complete video image is illustrated in FIG. 2.
  • a screen automatic splicing system may include wireless communication slave devices 4A to 4D disposed at four vertex angles of a projection screen arrangement area, each wireless communication slave device having a fixed MAC address. To distinguish. When it is not necessary to distinguish them, they may be collectively referred to as a wireless communication slave device 4. Further, each projection screen 3 is provided with a wireless communication master 5.
  • FIG. 3 illustrates the basic steps of a method of automatic screen stitching in accordance with an embodiment of the present invention.
  • the wireless communication slave device continuously transmits a wireless signal to the outside, and the wireless communication master device 5 can scan the wireless communication slave device 4 to receive the wireless signal from the wireless communication slave device 4. Since the signal from a certain wireless communication slave device 4 includes the fixed MAC address information of the wireless communication slave device 4, the wireless communication master device 5 can distinguish the source of the received wireless signal (step S1).
  • the wireless communication master device 5 transmits the received signal to the video distributor 1, and the video distributor 1 calculates the distance from each wireless communication master device 5 to the wireless communication slave device 4 based on the ranging information contained in these signals (step S2). ).
  • the video distributor 1 further converts the calculated distance into the position coordinate information of each wireless communication master device 5, that is, the coordinates of the projection screen 3 of the wireless communication master device 5 in the screen array plane coordinate system (steps) S3).
  • the video distributor 1 After obtaining the coordinate information of each projection screen 3 and thereby realizing the automatic positioning of the projection screen 3, the video distributor 1 performs image processing on the video image, wherein the video image is divided into corresponding numbers and arrangement patterns of the projection screen 3. A number of sub video images (step S4).
  • the video distributor 1 transmits a sub video signal corresponding to the sub video image to the corresponding projector 2 according to the coordinate information of each projection screen 3, so that the sub video image is displayed on the corresponding projection screen 3, thereby causing the display on each
  • the sub video images on the projection screen 3 are spliced to form a complete video image (step S5).
  • the wireless communication slave device 4 may be a Bluetooth slave device that transmits a Bluetooth signal
  • the wireless communication master device 5 may be a Bluetooth master device that scans and receives a Bluetooth signal
  • the wireless communication slave device 4 may be a Zigbee slave device that transmits a Zigbee signal
  • the wireless communication master device 5 may be a Zigbee master device that scans and receives a Zigbee signal.
  • the screen automatic splicing system and the screen automatic splicing method according to the embodiments of the present invention can realize automatic positioning of a plurality of projection screens and automatic distribution of video images by using wireless positioning technology.
  • the wireless communication master device 5 set on the projection screen initiates scanning to recognize and receive the Bluetooth signal from each wireless communication slave device 4 (step S1).
  • the wireless communication master device 5 of the projection screen 3B obtains a signal having a signal strength of 3B4A from the wireless communication slave device 4A, a signal having a signal strength of 3B4B from the wireless communication slave device 4B, respectively, by scanning the wireless communication slave devices 4A to 4D.
  • the signal of the wireless communication slave device 4C is 3B4C and the signal from the wireless communication slave device 4D is 3B4D.
  • the wireless communication master device 5 of the projection screen 3C obtains a signal having a signal strength of 3C4A from the wireless communication slave device 4A, a signal having a signal strength of 3C4B from the wireless communication slave device 4B, by scanning the wireless communication slave devices 4A to 4D, respectively.
  • the signal strength of the wireless communication slave device 4C is 3C4C and the signal strength of the wireless communication slave device 4D is 3C4D.
  • the wireless communication master device 5 of the projection screen 3D obtains a signal having a signal strength of 3D4A from the wireless communication slave device 4A, a signal having a signal strength of 3D4B from the wireless communication slave device 4B, by scanning the wireless communication slave devices 4A to 4D, respectively.
  • the signal strength of the wireless communication slave device 4C is 3D4C and the signal strength of the wireless communication slave device 4D is 3D4D.
  • the distances from the projection screens 3A to 3D to the respective wireless communication slave devices 4A to 4D are respectively calculated based on the Bluetooth signal strengths received by the respective wireless communication master devices 5 (step S2).
  • the distance can be calculated according to the distance calculation formula as follows.
  • d is the calculated distance
  • RSSI is the received signal strength (negative value)
  • A is the signal strength when the transmitting end (ie, the wireless communication slave device) and the receiving end (ie, the wireless communication master device) are separated by 1 meter
  • n is the environmental attenuation factor. Abs is an absolute value function and the RSSI value is usually expressed in dBm. Both A and n are constants obtained by experiments and can be set in advance.
  • the wireless communication master device can be calculated by substituting the received signal strength of the Bluetooth signal from each wireless communication slave device 4 received by the wireless communication master device 5 in step S1 into the formula (1). 5 to the distance of each wireless communication slave device 4. Since the signal strength of the Bluetooth signal is abruptly attenuated as the transmission distance increases, the calculated distance is easily accurate to the centimeter level.
  • Step S2 can be performed by the wireless communication master device 5, and then the calculated distance information is transmitted to the video distributor 1.
  • the wireless communication master device 5 may perform the step by the video distributor 1 after the distance measurement information (here, the received signal strength) of the received Bluetooth signal is transmitted to the video distributor 1.
  • the coordinates of each projection screen 3 in the plane coordinate system are obtained from the distance from the projection screen 3 to each wireless communication slave device 4, and the automatic positioning of the projection screen 3 is realized according to the coordinates of each projection screen 3 (step S3).
  • the relative positional relationship of each projection screen 3 in the horizontal direction and the vertical direction can be obtained from the distance from the projection screen 3 to each wireless communication slave device 4, and the projection screens 3 are obtained in the plane coordinate system according to the relative positional relationship. coordinate.
  • (1, 1), (1, 2) can be obtained according to the relative positional relationship of each projection screen 3 in the horizontal direction and the vertical direction.
  • the automatic positioning of each projection screen 3 in a two-dimensional array can be easily achieved by the above position coordinates.
  • FIGS. 1 and 2 illustrate an example in which four wireless communication slave devices 4A to 4D are arranged at four apex angles of the screen array.
  • the wireless communication slave device 4 may not be disposed at the top corner of the screen array, but may be disposed at the periphery of the screen array, respectively.
  • the video image is subjected to image processing in accordance with the position coordinates, and the video image is divided into sub-video images corresponding to the respective projection screens 3 and distributed (step S4).
  • the division and distribution of the video image can be achieved by the following method.
  • the position coordinates of the projection screen 3 in the system are (x, y)
  • the resolution of the video image is (TotalH, TotalV)
  • the system scale is (TotalX, TotalY)
  • the size of the sub video image is (SizeH, SizeV), the sub video.
  • the image area is (StarH (start line), StartV (start column), EndH (end line), EndV (end column)), you can get the following formula:
  • Screen number Coordinate ( x, y ) Video source resolution ( TotalH, TotalV ) System size (TotalX, TotalY) Screen 1 (1,1) 1080x1920 (2,2) Screen 2 (1,2) 1080x1920 (2,2) Screen 3 (2,1) 1080x1920 (2,2) Screen 4 (2,2) 1080x1920 (2,2)
  • the sub video image areas of each projection screen 3 can be respectively calculated as follows:
  • the positional coordinates of the projection screen 3A are (1, 1), and
  • the positional coordinates of the projection screen 3B are (1, 2), and
  • the positional coordinates of the projection screen 3C are (2, 1), and
  • the position coordinates of the projection screen 3D are (2, 2), and
  • the vertex coordinates of the image area to be displayed for each projection screen are obtained, and thus the video image is divided.
  • the corresponding sub-video images are displayed on each projection screen 3, and all the sub-video images constitute a complete video image, thereby realizing automatic splicing of the video images (step S5).
  • the present invention is obviously not limited thereto, and any known suitable wireless positioning technology may be employed.
  • any known suitable wireless positioning technology may be employed.
  • Zigbee positioning technology can also be used.
  • the distance can also be calculated from the received signal strength (ranging information) according to the above formula (1).

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Abstract

包括多个屏幕的屏幕自动拼接系统和用于该系统的屏幕自动拼接方法。所述多个屏幕均设有无线通信主设备，所述多个屏幕的外围设有多个无线通信从设备。所述方法包括步骤：各屏幕上的无线通信主设备发起扫描，识别并接收来自各无线通信从设备的信号(S1)；根据各所述无线通信主设备接收到的所述信号的测距信息，计算每个所述屏幕到各所述无线通信从设备的距离(S2)；根据所述距离获得各所述屏幕在平面坐标系中的坐标，完成各所述屏幕的自动定位(S3)；根据各所述屏幕的所述坐标将视频图像划分为与各所述屏幕对应的子视频图像并进行分配(S4)；各所述屏幕显示对应的所述子视频图像，各所述子视频图像拼接形成所述视频图像(S5)。

Description

屏幕自动拼接方法和屏幕自动拼接系统 技术领域
本发明涉及视频拼接处理领域。具体地，本发明涉及利用无线通信定位技术的屏幕自动拼接方法以及使用该方法的屏幕自动拼接系统。
 背景技术
近年来，随着国民经济的发展和科技水平的进步，人们对超大型视频显示设备的需求不断增长。由于大尺寸单一屏幕电视的生产难度大、成本高等原因，目前一般使用多个屏幕拼接的方式满足人们对于超大屏视频显示的需求。当前市场上常用的多屏拼接系统将视频画面划分为多个局部画面，每个局部画面按照预定的顺序显示在不同的屏幕上，从而实现超大屏显示。
 技术问题
然而，目前市场上的多屏拼接系统中的每块屏幕及其配套设备均是通过人工进行定位和配置，过程繁琐，维护不便。例如，当需拼接的屏幕数量较多时，人工配置需要花费较长的时间并且容易出现配置失误。另外，如果在使用过程中某一块屏幕出现故障，需要维修或更换，则需要对整个系统进行重新配置。
 技术解决方案
针对上述问题，本发明期望提供一种具有自动定位功能的屏幕自动拼接方法以及使用该方法的屏幕自动拼接系统，从而能够实现快速安装配置并且维护方便。
根据本发明的一个实施例公开了一种屏幕自动拼接方法。所述方法用于包括多个屏幕的屏幕拼接系统，所述多个屏幕均设有无线通信主设备，所述多个屏幕的外围设有多个无线通信从设备。所述方法包括以下步骤：
步骤S1：各屏幕上的无线通信主设备发起扫描，识别并接收来自各无线通信从设备的信号；
步骤S2：根据各所述无线通信主设备接收到的所述信号的测距信息，计算每个所述屏幕到各所述无线通信从设备的距离；
步骤S3：根据所述距离获得各所述屏幕在平面坐标系中的坐标，完成各所述屏幕的自动定位；
步骤S4：根据各所述屏幕的所述坐标将视频图像划分为与各所述屏幕对应的子视频图像并进行分配；
步骤S5：各所述屏幕显示对应的所述子视频图像，各所述子视频图像拼接形成所述视频图像。
优选地，所述测距信息是所述无线通信主设备接收来自各所述无线通信从设备的信号时的信号强度。
例如，所述无线通信主设备可以为蓝牙主设备，所述无线通信从设备为蓝牙从设备，所述信号是蓝牙信号，并且，在所述步骤S2中，每个所述屏幕到各所述无线通信从设备的距离是通过下述公式计算获得的：
d = 10^((abs(RSSI) - A) / (10 * n))
其中，RSSI为所述蓝牙主设备接收来自各所述蓝牙从设备的信号时的蓝牙信号强度，A为所述蓝牙从设备和所述蓝牙主设备相隔1米时的蓝牙信号强度，n为环境衰减因子，abs为绝对值函数。
可替代地，所述无线通信主设备可以为Zigbee主设备，所述无线通信从设备为Zigbee从设备，所述信号是Zigbee信号，并且，在所述步骤S2中，每个所述屏幕到各所述无线通信从设备的距离是通过下述公式计算获得的：
d = 10^((abs(RSSI) - A) / (10 * n))
其中，RSSI为所述Zigbee主设备接收来自各所述Zigbee蓝牙从设备的信号时的Zigbee信号强度，A为所述Zigbee从设备和所述Zigbee主设备相隔1米时的Zigbee信号强度，n为环境衰减因子，abs为绝对值函数。
优选地，在所述步骤S3中，由每个所述屏幕到各所述无线通信从设备的所述距离获得各所述屏幕在水平方向和垂直方向上的相对位置关系，并依据所述相对位置关系获得各所述屏幕在平面坐标系中的所述坐标。
优选地，在所述步骤S1中，所述无线通信主设备接收的所述信号中含有发射该信号的所述无线通信从设备的MAC地址，所述无线通信主设备根据所述MAC地址对来自各所述无线通信从设备的所述信号进行识别。
优选地，在所述步骤S4中，根据各所述屏幕的所述坐标和所述视频图像的分辨率计算出图像区域的顶点坐标，并按照所述顶点坐标将所述视频图像划分为多个所述子视频图像。
根据本发明的一个实施例公开了一种屏幕自动拼接系统。所述屏幕拼接系统包括：视频信号源，所述视频信号源提供视频图像的视频信号；视频分配器，所述视频分配器接收所述视频信号，并且对所述视频图像进行划分和分配；多个屏幕，用于显示视频图像并且以二维阵列的形式布置，每个所述屏幕设置有无线通信主设备；投影机，所述投影机与所述屏幕一一对应地设置，并且将来自所述视频分配器的所述子视频图像投影至相应的所述屏幕；多个无线通信从设备，所述无线通信从设备设置于所述屏幕的二维阵列的外围，所述无线通信从设备不断地对外发射信号。所述系统能够执行如上所述的屏幕自动拼接方法。
优选地，所述系统包括位于所述屏幕的二维阵列的四个顶角处的四个所述无线通信从设备。
 有益效果
如上所述，根据本发明的屏幕自动拼接方法和屏幕自动拼接系统通过利用诸如蓝牙定位或Zigbee定位无线通信定位技术，实现了多屏幕的自动定位和视频图像的自动切分，使用方便，安装快速，维护成本低。
应当理解，本发明的有益效果不限于上述效果，而可以是本文中说明的任何有益效果。
 附图说明
图1示出了根据本发明实施例的屏幕自动拼接系统的示意图。
图2图示了视频图像的多屏拼接的示例的示意图。
图3是图示了根据本发明实施例的屏幕自动拼接方法的各主要步骤的流程图。
图4示出了根据本发明实施例的子视频图像区域的坐标图。
图5至图7是示出了根据本发明实施例的故障屏幕更换的示意图。
 本发明的最佳实施方式
下面，将参照附图详细说明根据本发明的各具体实施例。需要强调的是，附图仅是示意性的并且不一定是按照真实比例图示的，因而不具有限定性。
一、屏幕自动拼接系统和屏幕自动拼接方法概述
图1示出了根据本发明实施例的屏幕拼接系统的示意图。该系统主要用于需要超大视频显示的应用环境，例如广告宣传墙、监控中心、调度中心、会议室及展示厅等。如图1所示，屏幕拼接系统包括视频信号源（未图示）、视频分配器1、投影机2、投影屏幕3、无线通信从设备4和无线通信主设备5（参见图5~图7）。该系统中的投影屏幕3根据设计需要以二维阵列的形式布置在墙壁或支架上，每一个屏幕显示不同的子视频图像，所有的子视频图像拼接形成完整的视频图像，从而实现大尺寸的图像显示。
如图1中所示，根据本发明实施例的屏幕自动拼接系统包括以2×2阵列布置的四块投影屏幕3A至3D。当不需要区分它们时，可以统称为投影屏幕3。当然，投影屏幕3的数量和阵列布置方式不限于此。视频信号源可以是DVD、摄像机、卫星接收机、机顶盒等视频源，视频信号源能够提供与将要显示的视频图像相对应的视频信号。视频分配器1接收从信号源发送来的视频信号，并根据对屏幕的自动定位处理实现视频信号的划分，生成与屏幕3数量相对应的子视频信号。视频分配机1将子视频信号发送至各投影机2。投影机2与投影屏幕3一一对应地设置，并且分别将与子视频信号对应的子视频图像投影至对应的投影屏幕3上。每个投影屏幕3上显示的子视频图像拼接在一起，形成了完整的视频图像。图2中图示了由图1中所示的四块投影屏幕3上的子视频图像拼接形成完整的视频图像的示例。如图1所示，根据本发明实施例的屏幕自动拼接系统可以包括设置在投影屏幕布置区域的四个顶角处的无线通信从设备4A至4D，每台无线通信从设备具有固定的MAC地址以进行区分。当不需要区分它们时，可以统称为无线通信从设备4。此外，每个投影屏幕3设置有无线通信主设备5。
图3图示了根据本发明实施例的屏幕自动拼接方法的基本步骤。无线通信从设备不断地对外发射无线信号，无线通信主设备5能够对无线通信从设备4进行扫描，接收来自无线通信从设备4的无线信号。由于来自某台无线通信从设备4的信号中包含该台无线通信从设备4的固定的MAC地址信息，所以无线通信主设备5能够对接收的无线信号的来源进行区分（步骤S1）。无线通信主设备5将接收到的信号传输给视频分配器1，视频分配器1基于这些信号中含有的测距信息计算出各台无线通信主设备5到无线通信从设备4的距离（步骤S2）。然后，视频分配器1将计算出的距离进一步转换为各台无线通信主设备5的位置坐标信息，即，设置有无线通信主设备5的投影屏幕3在屏幕阵列平面坐标系中的坐标（步骤S3）。在获得各投影屏幕3的坐标信息并由此实现投影屏幕3的自动定位之后，视频分配器1对视频图像进行图像处理，其中，视频图像被划分为与投影屏幕3的数量和排列模式相对应的若干个子视频图像（步骤S4）。视频分配器1根据各投影屏幕3的坐标信息将与子视频图像对应的子视频信号发送至相应的投影机2，以使子视频图像被显示在相应的投影屏幕3上，从而使显示在各投影屏幕3上的子视频图像拼接形成完整的视频图像（步骤S5）。
在根据本发明的屏幕自动拼接系统和屏幕自动拼接方法中，为了实现对投影屏幕3的自动定位，可以采用适合的现有的无线定位技术，诸如蓝牙定位技术、Zigbee定位技术。例如，无线通信从设备4可以是发送蓝牙信号的蓝牙从设备，无线通信主设备5可以是扫描并接收蓝牙信号的蓝牙主设备。或者，无线通信从设备4可以是发送Zigbee信号的Zigbee从设备，无线通信主设备5可以是扫描并接收Zigbee信号的Zigbee主设备。
如上所述，根据本发明实施例的屏幕自动拼接系统和屏幕自动拼接方法利用无线定位技术能够实现对多个投影屏幕的自动定位和视频图像的自动分配。
二、基于蓝牙定位的屏幕自动拼接方法的详细说明
下面，将参照图1和图2中所示的2×2阵列布置的四屏幕系统说明根据本发明实施例的采用蓝牙定位技术的屏幕自动拼接方法和屏幕自动拼接系统的示例。首先，设置在投影屏幕上的无线通信主设备5发起扫描，识别并接收来自各无线通信从设备4的蓝牙信号（步骤S1）。例如，图1中的投影屏幕3A的无线通信主设备5通过扫描无线通信从设备4A至4D，分别获得来自无线通信从设备4A的信号强度为3A4A（接收信号强度，一般为负值，下同）的信号、来自无线通信从设备4B的信号强度为3A4B的信号、来自无线通信从设备4C的信号强度为3A4C的信号和来自无线通信从设备4D的信号强度为3A4D的信号。投影屏幕3B的无线通信主设备5通过扫描无线通信从设备4A至4D，分别获得来自无线通信从设备4A的信号强度为3B4A的信号、来自无线通信从设备4B的信号强度为3B4B的信号、来自无线通信从设备4C的信号强度为3B4C的信号和来自无线通信从设备4D的信号强度为3B4D的信号。投影屏幕3C的无线通信主设备5通过扫描无线通信从设备4A至4D，分别获得来自无线通信从设备4A的信号强度为3C4A的信号、来自无线通信从设备4B的信号强度为3C4B的信号、来自无线通信从设备4C的信号强度为3C4C的信号和来自无线通信从设备4D的信号强度为3C4D的信号。投影屏幕3D的无线通信主设备5通过扫描无线通信从设备4A至4D，分别获得来自无线通信从设备4A的信号强度为3D4A的信号、来自无线通信从设备4B的信号强度为3D4B的信号、来自无线通信从设备4C的信号强度为3D4C的信号和来自无线通信从设备4D的信号强度为3D4D的信号。或者，通过在无线通信主设备5中预先设定各无线通信从设备4的发射信号强度，也可以通过扫描获得：无线通信从设备4A到投影屏幕3A的信号衰减3Ad4A、无线通信从设备4B到投影屏幕3A的信号衰减3Ad4B、无线通信从设备4C到投影屏幕3A的信号衰减3Ad4C和无线通信从设备4D到投影屏幕3A的信号衰减3Ad4D；无线通信从设备4A到投影屏幕3B的信号衰减3Bd4A、无线通信从设备4B到投影屏幕3B的信号衰减3Bd4B、无线通信从设备4C到投影屏幕3B的信号衰减3Bd4C和无线通信从设备4D到投影屏幕3B的信号衰减3Bd4D；无线通信从设备4A到投影屏幕3C的信号衰减3Cd4A、无线通信从设备4B到投影屏幕3C的信号衰减3Cd4B、无线通信从设备4C到投影屏幕3C的信号衰减3Cd4C和无线通信从设备4D到投影屏幕3C的信号衰减3Cd4D；无线通信从设备4A到投影屏幕3D的信号衰减3Dd4A、无线通信从设备4B到投影屏幕3D的信号衰减3Dd4B、无线通信从设备4C到投影屏幕3D的信号衰减3Dd4C和无线通信从设备4D到投影屏幕3D的信号衰减3Dd4D。然后，再由发射信号强度和各信号衰减值计算出接收到的蓝牙信号强度。
接着，根据各无线通信主设备5接收到的蓝牙信号强度，分别计算投影屏幕3A至3D到各无线通信从设备4A至4D的距离（步骤S2）。例如，可以根据如下的距离计算公式来计算距离。
d = 10^((abs(RSSI) - A) / (10 * n)) （1）
其中，d为计算出的距离；RSSI为接收信号强度（负值）；A为发射端（即，无线通信从设备）和接收端（即，无线通信主设备）相隔1米时的信号强度；n为环境衰减因子。abs为绝对值函数，RSSI值通常以dBm值表示。A和n均是通过实验获得的常数，能够预先设定。
由上述公式（1）可知，将在步骤S1中的无线通信主设备5接收到的来自各无线通信从设备4的蓝牙信号的接收信号强度代入公式（1），即可计算出无线通信主设备5到各无线通信从设备4的距离。由于蓝牙信号的信号强度随着传输距离的增大而急剧衰减，因此计算出的距离很容易精确到厘米等级。步骤S2可以由无线通信主设备5进行，然后将计算出的距离信息传输至视频分配器1。或者，可以是无线通信主设备5将接收到的蓝牙信号的测距信息（这里是接收信号强度）等传输至视频分配器1后，由视频分配器1执行该步骤。
接着，由投影屏幕3到各无线通信从设备4的距离获得各投影屏幕3在平面坐标系中的坐标，并根据各投影屏幕3的坐标实现投影屏幕3的自动定位（步骤S3）。具体地，可以由投影屏幕3到各无线通信从设备4的距离获得各投影屏幕3在水平方向和垂直方向上的相对位置关系，并依据相对位置关系获得各投影屏幕3在平面坐标系中的坐标。例如，在如图1所示的2×2的投影屏幕阵列的情况下，根据各投影屏幕3在水平方向和垂直方向上的相对位置关系，可以获得（1,1）、（1,2）、（2,1）和（2,2）这四个位置坐标。显然，由上述位置坐标，可以容易地实现各投影屏幕3在二维阵列中的自动定位。
另外，应当理解的是，图1和图2中均图示了在屏幕阵列的四个顶角布置有四个无线通信从设备4A至4D的示例。但由上面的定位方法可知，对于以二维阵列排布的多个投影屏幕，设置一个以上的无线通信从设备4就可以实现对投影屏幕的自动定位。另外，无线通信从设备4也可以不设置在屏幕阵列的顶角处，而是分别设置在屏幕阵列的外围即可。
然后，根据位置坐标对视频图像进行图像处理，将视频图像划分为与各投影屏幕3对应的子视频图像并进行分配（步骤S4）。具体地，可以通过如下方法实现对视频图像的划分和分配。
假设投影屏幕3在系统中的位置坐标为（x,y），视频图像分辨率为（TotalH,TotalV），系统规模为(TotalX,TotalY)，子视频图像大小为(SizeH,SizeV)，子视频图像区域为（StarH（起始行）,StartV（起始列）,EndH（结束行）,EndV（结束列）），则可以获得下列计算公式：
TotalX = xmax （2）
TotalY = ymax （3）
SizeH = TotalH / TotalX （4）
SizeV = TotalV / totallY （5）
StarH= SizeH × (x-1) （6）
StarV= SizeV × (y-1) （7）
EndH= StarH + SizeH （8）
EndV= StarV + SizeV （9）
针对如图1和图2所示的2×2阵列的4投影屏幕系统和视频图像的分辨率为1080×1920（本文中，沿水平方向为行，沿垂直方向为列）的情况，可以获得下表1中的计算参数。
表 1
屏幕编号 坐标
（ x,y ）		 视频源分辨率
（ TotalH, TotalV ）		 系统规模
(TotalX, TotalY)
屏幕 1 (1,1) 1080x1920 (2,2)
屏幕 2 (1,2) 1080x1920 (2,2)
屏幕 3 (2,1) 1080x1920 (2,2)
屏幕 4 (2,2) 1080x1920 (2,2)
根据上述计算公式（2）~（9）和表1中的计算参数，可分别计算出各投影屏幕3的子视频图像区域如下：
投影屏幕3A的位置坐标为(1,1)，并且
StarH = SizeH × (x-1) = (TotalH / TotalX ) × (x-1)
= 1080/2×(1-1)=540×0=0；
StarV = SizeV × (y-1) = (TotalV / TotalY ) × (y-1)
=1920/2×(1-1)=960×0=0；
EndH = StarH +SizeH = (TotalH / TotalX ) × x =540×1=540；
EndV = StarV +SizeV = (TotalV / TotalY ) × y =960×1=960；
因此，图1中的投影屏幕3A将要显示的子视频图像区域为（StarH,StartV,EndH,EndV）=(0,0,540,960)。
投影屏幕3B的位置坐标为(1,2)，并且
StarH = SizeH × (x-1) = (TotalH / TotalX ) × (x-1)
= 1080/2×(1-1)=540×0=0；
StarV = SizeV × (y-1) = (TotalV / TotalY ) × (y-1)
=1920/2×(2-1)=960×1=960；
EndH = StarH +SizeH = (TotalH / TotalX ) × x=540×1=540；
EndV = StarV +SizeV = (TotalV / TotalY ) × y=960×2=1920；
因此，图1中的投影屏幕3B将要显示的子视频图像区域为（StarH,StartV,EndH,EndV）=(0,960,540,1920)。
投影屏幕3C的位置坐标为(2,1)，并且
StarH = SizeH × (x-1) = (TotalH / TotalX ) × (x-1)
= 1080/2×(2-1)=540×1=540；
StarV = SizeV × (y-1) = (TotalV / TotalY ) × (y-1)
=1920/2×(1-1)=960×0=0；
EndH = StarH +SizeH = (TotalH / TotalX ) × x=540×2=1080；
EndV = StarV +SizeV = (TotalV / TotalY ) × y=960×1=960；
因此，图1中的投影屏幕3C将要显示的子视频图像区域为（StarH,StartV,EndH,EndV）=(540,0,1080,960)。
投影屏幕3D的位置坐标为(2,2)，并且
StarH = SizeH × (x-1) = (TotalH / TotalX ) × (x-1)
= 1080/2×(2-1)=540×1=540；
StarV = SizeV × (y-1) = (TotalV / TotalY ) × (y-1)
=1920/2×(2-1)=960×0=960；
EndH = StarH +SizeH = (TotalH / TotalX ) × x=540×2=1080；
EndV = StarV +SizeV = (TotalV / TotalY ) × y=960×2=1920；
因此，图1中的投影屏幕3D将要显示的子视频图像区域为（StarH,StartV,EndH,EndV）=(540,960,1080,1920)。
这样，如图4所示，获得了各投影屏幕将要显示的图像区域的顶点坐标，并由此对视频图像进行划分。最后，将相应的子视频图像显示在各投影屏幕3上，所有子视频图像构成完整的视频图像，从而实现了视频图像的自动拼接（步骤S5）。
虽然以上以采用蓝牙定位技术为例说明了根据本发明的屏幕自动拼接系统和屏幕自动拼接方法的示例，但本发明显然不限于此，而是可以采用任何已知的适合的无线定位技术。例如，也可以采用Zigbee定位技术。当采用Zigbee定位技术时，同样可以根据上述公式（1）由接收信号强度（测距信息）计算出距离。
应当理解，上述的屏幕拼接方法虽然是以2×2的4屏幕系统为例进行的说明，但显然可以应用于任何n×m阵列形式布置的多屏幕拼接系统。
三、屏幕拼接系统的维护示例
如图5所示，假设已经配置完成了3×4的12屏幕拼接墙。经过一段时间的使用，如图6中所示，第一行第二列的设备（1,2）出现了故障。在此情况下，按照过去的维护方式，工程人员到现场对发生故障的设备进行维修或更换后，必须重新对整套设备进行配置，非常耗费时间。通过采用根据本发明的屏幕拼接系统，只需要在维修或更换之后，由系统自动执行一遍上述屏幕拼接方法，即可如图8所示，即插即用，实现新设备的自动匹配，重新实现视频图像的多屏幕拼接。
尽管在上面已经参照附图说明了根据本发明的发光设备，但是本发明不限于此，且本领域技术人员应理解，在不偏离本发明随附权利要求书限定的实质或范围的情况下，可以做出各种改变、组合、次组合以及变型。

Claims (9)

1．一种屏幕自动拼接方法，用于包括多个屏幕的屏幕拼接系统，所述多个屏幕均设有无线通信主设备，所述多个屏幕的外围设有多个无线通信从设备，所述方法包括以下步骤：
步骤S1：各屏幕上的无线通信主设备发起扫描，识别并接收来自各无线通信从设备的信号；
步骤S2：根据各所述无线通信主设备接收到的所述信号的测距信息，计算每个所述屏幕到各所述无线通信从设备的距离；
步骤S3：根据所述距离获得各所述屏幕在平面坐标系中的坐标，完成各所述屏幕的自动定位；
步骤S4：根据各所述屏幕的所述坐标将视频图像划分为与各所述屏幕对应的子视频图像并进行分配；
步骤S5：各所述屏幕显示对应的所述子视频图像，各所述子视频图像拼接形成所述视频图像。
2．根据权利要求1所述的屏幕自动拼接方法，其特征在于，所述测距信息是所述无线通信主设备接收来自各所述无线通信从设备的信号时的信号强度。
3．根据权利要求2所述的屏幕自动拼接方法，其特征在于，所述无线通信主设备为蓝牙主设备，所述无线通信从设备为蓝牙从设备，所述信号是蓝牙信号，并且，在所述步骤S2中，每个所述屏幕到各所述无线通信从设备的距离是通过下述公式计算获得的：
d = 10^((abs(RSSI) - A) / (10 * n))
其中，RSSI为所述蓝牙主设备接收来自各所述蓝牙从设备的信号时的蓝牙信号强度，A为所述蓝牙从设备和所述蓝牙主设备相隔1米时的蓝牙信号强度，n为环境衰减因子，abs为绝对值函数。
4．根据权利要求2所述的屏幕自动拼接方法，其特征在于，所述无线通信主设备为Zigbee主设备，所述无线通信从设备为Zigbee从设备，所述信号是Zigbee信号，并且，在所述步骤S2中，每个所述屏幕到各所述无线通信从设备的距离是通过下述公式计算获得的：
d = 10^((abs(RSSI) - A) / (10 * n))
其中，RSSI为所述Zigbee主设备接收来自各所述Zigbee蓝牙从设备的信号时的Zigbee信号强度，A为所述Zigbee从设备和所述Zigbee主设备相隔1米时的Zigbee信号强度，n为环境衰减因子，abs为绝对值函数。
5．根据权利要求1至4中任一项所述的屏幕自动拼接方法，其特征在于，在所述步骤S3中，由每个所述屏幕到各所述无线通信从设备的所述距离获得各所述屏幕在水平方向和垂直方向上的相对位置关系，并依据所述相对位置关系获得各所述屏幕在平面坐标系中的所述坐标。
6．根据权利要求1至4中任一项所述的屏幕自动拼接方法，其特征在于，在所述步骤S1中，所述无线通信主设备接收的所述信号中含有发射该信号的所述无线通信从设备的MAC地址，所述无线通信主设备根据所述MAC地址对来自各所述无线通信从设备的所述信号进行识别。
7．根据权利要求1至4中任一项所述的屏幕自动拼接方法，其特征在于，在所述步骤S4中，根据各所述屏幕的所述坐标和所述视频图像的分辨率计算出图像区域的顶点坐标，并按照所述顶点坐标将所述视频图像划分为多个所述子视频图像。
8．一种屏幕自动拼接系统，其特征在于，所述屏幕拼接系统包括：
视频信号源，所述视频信号源提供视频图像的视频信号；
视频分配器，所述视频分配器接收所述视频信号，并且对所述视频图像进行划分和分配；
多个屏幕，用于显示视频图像并且以二维阵列的形式布置，每个所述屏幕设置有无线通信主设备；
投影机，所述投影机与所述屏幕一一对应地设置，并且将来自所述视频分配器的所述子视频图像投影至相应的所述屏幕；
多个无线通信从设备，所述无线通信从设备设置于所述屏幕的二维阵列的外围，所述无线通信从设备不断地对外发射信号，
其中，所述系统能够执行如权利要求1至7中任一项所述的屏幕自动拼接方法。
9．根据权利要求8所述的屏幕自动拼接系统，其特征在于，所述系统包括位于所述屏幕的二维阵列的四个顶角处的四个所述无线通信从设备。
PCT/CN2017/103646 2017-08-01 2017-09-27 屏幕自动拼接方法和屏幕自动拼接系统 Ceased WO2019024210A1 (zh)

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