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CN-115950410-B - Method for aligning camera with LED large screen

CN115950410BCN 115950410 BCN115950410 BCN 115950410BCN-115950410-B

Abstract

The invention provides a method for aligning a camera with an LED large screen, which comprises the following steps of S1, arranging a mechanism such as a plane mirror for aiming in front of the LED large screen and the camera needing to be aligned with the LED large screen. S2, adjusting the position of the plane mirror for aiming relative to the LED large screen. S3, the camera lens back image and the twenty-first sight glass back image can be seen through adjusting the tripod and connecting the platform to a display screen of the controller. S4, overlapping the inverted image of the twentieth-shaped sight with the first cross sight by adjusting the tripod and connecting the platform to the display screen of the controller. S5, withdrawing the aiming plane mirror and other mechanisms. The invention can realize that the camera lens of the camera and the LED large screen are maximally close to be vertical in the debugging process, and finish the operation of aligning the camera with the LED large screen.

Inventors

  • LI YAN
  • LI CHENGJI
  • XU HAI
  • HE HAIQUAN
  • CUI JINGXIN
  • LIU FUJU
  • LIU XINGCHEN

Assignees

  • 北京德火科技有限责任公司

Dates

Publication Date
20260512
Application Date
20221025

Claims (7)

  1. 1. A method for aligning a camera with an LED large screen, comprising: S1, arranging a plane mirror (1) for aiming and a camera (3) which needs to be aligned with the LED large screen in front of the LED large screen (9), wherein a first cross-shaped sight (104) is arranged on the plane mirror (1) for aiming, two groups of hauling ropes (101) are respectively fixed on two fixed points which are the same in position from the center of the plane mirror (1) for aiming at the top end of the plane mirror (1), lead wires (201) with the same length are respectively fixed on the two groups of hauling ropes (101) at the same position from the fixed points, a lead (2) with the same size is respectively fixed at the bottom ends of the two lead wires (201), a transparent plate (12) is hung in front of a lens of the camera (3), the transparent plate (12) is provided with a twenty-shaped sight at the center point of the lens of the camera (3), the camera (3) is fixed on a tripod (13) through a connecting platform (4), and the signal output end of the camera (3) is connected with a control signal with the camera (5) with a display screen through a signal wire or a wireless network; S2, firstly winding the traction rope (101) to enable the plane mirror (1) for aiming to be suspended in front of the LED large screen (9), and then adjusting the plumb line (201) and the plumb (2) through respectively and moderately winding the traction rope (101) to enable the plumb line (201) to be straightened under the natural falling acting force of the plumb (2), and enabling the plumb (2) to just touch the bottom surface of the LED large screen (9); s3, adjusting a tripod (13) and a connecting platform (4) until a plane mirror (1) for aiming and a reflection (11) of a camera (3) lens and a reflection (1101) of a twentieth-shaped sight are observed in a display screen of a control machine (5); s4, enabling a back image (1101) of a twenty-first sight in a display screen of a control machine (5) to coincide with a first cross sight (104) through adjusting a tripod (13) and a connecting platform (4), wherein a lens of a camera (3) is nearly vertical to a plane mirror (1) for aiming; S5, withdrawing the plane mirror (1), the traction rope (101), the plumb line (201), the plumb (2) and the transparent plate (12) for aiming to finish the operation of aligning the camera (3) with the LED large screen (9); The connecting platform (4) comprises an electric control rotating platform (403), wherein the camera (3) is arranged at the rotating end of the electric control rotating platform (403); The camera (3) is arranged on the rotating end of the electric control rotating table (403) through an angle adjusting device, the angle adjusting device comprises a rotating base (404) fixed on the rotating end of the electric control rotating table (403), the outer side wall of the camera (3) is rotatably arranged on the rotating base (404) through a rotating shaft (405), a connecting rod (406) is fixed on the back side of a lens of the camera (3), a guide rail (407) is arranged on one side of the connecting rod (406) along the vertical direction, the bottom of the guide rail (407) is fixed on the rotating end of the electric control rotating table (403), a rolling shaft (408) is connected on the guide rail (407) in a toothed manner, the rolling shaft (408) is fixedly connected with the output end of an electric control driving device (409), and the electric control driving device (409) is fixed on the connecting rod (406); The electronic control driving device (409) is provided with a roller locking mechanism, the roller locking mechanism comprises at least 2 pressing sheets (8) arranged around a roller (408), a second toothed belt (801) and a positioning block (802) protruding outwards are arranged on one side surface of each pressing sheet (8) facing the roller (408), one side of each pressing sheet (8) facing away from the roller (408) is respectively fixed with a telescopic end of one electronic control telescopic machine (7), the roller (408) is provided with second gear teeth (4084) which are meshed with the second toothed belt (801) along an axial surface wheel at the position corresponding to the second toothed belt (801), and a slot (4082) corresponding to the positioning block (802) is arranged at the position corresponding to the positioning block (802); The positioning block (802) is provided with a first rubber layer (803) on one side facing the slot (4082), and a second rubber layer (4083) is sleeved at the bottom of the slot (4082).
  2. 2. Method for aligning a camera with a LED large screen according to claim 1, characterized in that the hauling cable (101) is fixed with the drum of the electrically controlled winch (103) after adjusting the direction by means of a set of pulleys (102).
  3. 3. The method for aligning the camera with the LED large screen according to claim 1 is characterized in that the connecting platform (4) comprises a lower base (401) and an upper base (402), wherein the bottom of the lower base (401) is fixed with the top end of a tripod (13), a first singlechip (4012) and at least 3 electric control elevators (4011) are arranged in the lower base (401), the signal output end of the first singlechip (4012) is in signal connection with the control signal input end of the electric control elevators (4011), the lifting end of the electric control elevators (4011) extends to the outer side of the top of the lower base (401) and is fixed with the bottom of the upper base (402), an electronic gyroscope (4021) is arranged in the upper base (402), and the signal output end of the electronic gyroscope (4021) is in signal connection with the signal input end of the first singlechip (4012).
  4. 4. The method for aligning the camera with the LED large screen according to claim 1, wherein the guide rail (407) is formed by concentric circular-arc toothed rails (4071) and circular-arc pressing rails (4072) at a certain distance, the circle centers of the circular-arc toothed rails (4071) and the circular-arc pressing rails (4072) are positioned at the axle center of the rotating shaft (405), and the fixed end surfaces are connected and sealed through a connecting sealing plate (4074); The novel roller is characterized in that a first toothed belt (4073) is arranged on the inner side face of the circular arc toothed rail (4071) along the cambered surface, a polytetrafluoroethylene layer is arranged on the inner side face of the circular arc toothed rail (4072), a first tooth groove (4085) is arranged at the position corresponding to the first toothed belt (4073) of the roller (408), first gear teeth (4086) are arranged in the first tooth groove (4085), the roller (408) is inserted between the circular arc toothed rail (4071) and the circular arc toothed rail (4072), one end of the roller is in abutting and sliding connection with the inner side face of the circular arc toothed rail (4072), the first toothed belt (4073) is inserted into the first tooth groove (4085) through the other end of the roller, and the first toothed belt (4073) is in toothed connection with the first gear teeth (4086).
  5. 5. The method for aligning the camera with the LED large screen according to claim 1, wherein a second single chip microcomputer (4022) is arranged in the connecting platform (4), a signal output end of the second single chip microcomputer (4022) is respectively connected with a control signal input end of the electric control rotary table (403) and a control signal input end of the electric control driving device (409), and a signal input end of the second single chip microcomputer (4022) is connected with a signal output end of the camera (3) in a signal mode.
  6. 6. The method for aligning the camera with the LED large screen according to claim 5, wherein a signal receiving module (4023) is arranged in the connecting platform (4), the signal receiving module (4023) is in signal connection with a remote controller (6) through a wired or wireless network, and the remote controller (6) is independently arranged or additionally arranged on the controller (5).
  7. 7. Method for aligning a camera with a LED large screen according to claim 1, characterized in that the top surface of the connection platform (4) is fixed with a level meter (410).

Description

Method for aligning camera with LED large screen Technical Field The invention belongs to the technical field of virtual simulation, and particularly relates to a method for aligning a camera with an LED large screen. Background In recent years, LED large screen applications are becoming more and more popular, and many release meetings, television programs and even movie shooting use LED-based large screen display technology, and LED-based large screen virtual display technology is also becoming an important branch of virtual reality applications. In contrast, in the virtual display technology based on the LED large screen, it is necessary to observe the content displayed on the LED large screen using a movie camera or a television-grade camera as an observer. On the one hand, the display effect of the external output is based on the picture presented by the camera, and the camera is required to shoot and relay the content displayed by the LED large screen in the process. On the other hand, the change of the virtual scene presented by the LED large screen needs to be adjusted by a position sensor associated with the camera, based on the real-time spatial position of the camera transmitted by the position sensor. However, in actual work, errors exist between the real camera and the virtual camera calculated by the position sensor in two fields of a spatial position and a spatial rotation angle, the errors of the real camera and the virtual camera have 6 components in total, and three components of the position X, Y and Z and three components of the rotation Pitch, yaw and Roll effectively eliminate the errors between the real camera and the virtual camera, so that the calculation amount of the modeling analysis of the subsequent virtual scene can be reduced, and the presentation effect of the virtual scene can be improved. By aligning the camera with the LED large screen, especially vertically aligning with the LED large screen, three rotation components of Pitch, yaw and Roll between the real camera and the virtual camera can be all equal to about 0, so that the error correction analysis data volume between the real camera and the virtual camera is obviously reduced, the calculation volume of the subsequent virtual scene modeling analysis is reduced, and the virtual scene presentation effect is improved. The common mode in the prior art is to display a section of irrelevant content or related content through the LED large screen, and a worker operates the camera to perform manual correction before actual shooting, namely, the camera is vertical to the LED large screen as much as possible through manual observation and adjustment of the height, angle and deflection of the camera. However, manual correction exists that 1, whether the camera is vertical or not completely depends on observation of staff, and deflection at a fine angle is difficult to be perceived by naked eyes, so that the camera is difficult to correct to be in a state closest to the vertical, and a certain correction error exists. 2. The manual correction is affected by factors such as working experience, working state and personal body difference of the staff, and the correction effect fluctuates, so that the error value after each correction is not fixed. For this reason, it is not possible to determine whether the camera is actually perpendicular or nearly perpendicular to the PED large screen, and therefore, it is not possible to directly determine whether all three rotation components of Pitch, yaw, roll are equal to about 0, but only after the correction error analysis and correction are performed, and the correction parameters are also required to be corrected in the subsequent virtual reality data analysis process, so that the data analysis amount is not substantially reduced. Disclosure of Invention The present invention addresses the deficiencies of the prior art by providing a method for aligning a camera to an LED large screen, comprising: S1, arranging a plane mirror for aiming and a camera which needs to be aligned with the LED large screen in front of the LED large screen, arranging a first cross-shaped sight on the plane mirror for aiming, respectively fixing two groups of traction ropes at left and right fixing points which are the same with the center of the plane mirror for aiming at the top end of the plane mirror for aiming, respectively fixing plumb lines with the same length at the same positions which are the same with the fixing points on the two groups of traction ropes, respectively fixing plumbs with the same size at the bottom ends of the two plumb lines, hanging a transparent plate in front of a lens of the camera, arranging a twenty-shaped sight on the center point of the lens of the camera, and fixing the camera on a tripod through a connecting platform, wherein the signal output end of the camera is connected with a controller with a display screen through a signal line or a wireless network. S2, firstly windi