A multi-camera collaborative geographic video live stream generation method
A geographic video, multi-camera technology, applied in the field of geographic information, can solve the problems of large amount of data, lack of intelligent integration of multiple camera videos, single network transmission mode, etc., to achieve the effect of ensuring applicability
Active Publication Date: 2022-08-09
河南省科学院地理研究所
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[0004] Aiming at the disadvantages of the existing method that the image space does not coincide with the geographical space position, the lack of intelligent fusion of multiple camera videos, the single network transmission mode, and the large amount of data, the present invention provides a multi-camera collaborative geographical video live stream generation method , to improve the output speed and quality of live video streaming
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[0030] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
[0031] Facing the urgent needs of WebGIS for multi-camera collaborative geographic video streaming services, considering the large differences in the viewing angles of each camera scene in the geographic scene, the overlapping map mapping of video content under multiple cameras, and the output speed and quality of live video streams are greatly limited by network bandwidth. Problem, the present invention provides a multi-camera cooperative geographic video live stream generation method.
[0032] The overall technical idea of the multi-camera collaborative geographic video live stream generation method in this embodiment is as follows: first, for each camera video, combined with the high-definition remote sensing base map, select 4 or more points with the same name to solve the homography of each camera. matrix, and calculate the fi...
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The invention discloses a multi-camera coordinated geographic video live stream generation method. The specific steps are: (1) According to the video of each camera, combined with the high-definition remote sensing base map, select the same name point to solve the homography matrix and field of view of each camera; (2) Determine the live broadcast area and the cameras in the area on the two-dimensional map. (3) Perform grid division on the live broadcast area, and calculate the corresponding image coordinates and pixel values of each grid center point according to the inverse transformation of the homography matrix; (4) According to the homography matrix, calculate the Projection area and length deformation ratio; (5) Based on the optimal conditions, weighted and optimized pixels in the overlapping field of view; (6) According to the network bandwidth, an adaptive video image stream generation method is adopted for live broadcast. The invention solves the problems of low efficiency of multi-camera geographic video live broadcast under 2D WebGIS, repeated mapping of pixels in overlapping fields of view, large amount of video stream data, and the output quality and speed are greatly limited by network bandwidth.
Description
technical field [0001] The invention relates to a multi-camera coordinated geographic video live stream generation method, which belongs to the technical field of geographic information. Background technique [0002] With the development of science and technology, video surveillance networks and geographic information systems have been widely used in smart cities, natural resource supervision, public security and other fields. The video surveillance network has the advantages of high definition, reality and real-time, and the geographic information system has the characteristics of locating, measuring, analyzing and simulating. The integration of the two can provide real-time status information in large scenes, so that supervision and security work can be It is completed under a unified view, which greatly reduces the difficulty of the work. [0003] Currently, for each camera in the monitoring area, the position of the camera is represented by a point symbol in the map, an...
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IPC IPC(8): H04N21/2187H04N21/218H04N7/18
CPCH04N21/2187H04N21/21805H04N7/181
Inventor 鲁鹏陈盼盼张兴国王霞刘伟
Owner 河南省科学院地理研究所