Method for extracting height and distance of object in video image
A technology in video images and images, which is used in line-of-sight measurement, distance measurement, measurement devices, etc., and can solve problems such as practicality and accuracy impact, difficulty in achieving satisfactory results, and limited applicability.
Active Publication Date: 2014-12-24
BEIJING QIANLISHIKONG SCI & TECH
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This method needs to determine multiple pairs of parallel lines and determine the scale factor through the external reference height, which affects both practicality and accuracy (especially in outdoor scenes)
[0004] In summary, the existing method of extracting object height from a single video image has limited applicability, and it is difficult to achieve satisfactory results
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[0015] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0016] It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. The implementations that are marked for simplification or convenience in the drawings, and not shown or described in the drawings, are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values within acceptable error margins or design constraints.
[0017] The method for extracting the height and distance of the object in the video ima...
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The invention relates to the video image processing technology, and provides a method for extracting the height and the distance of an object in a video image to realize measurement of the height and the distance of the object in the video monitoring image. Two angle values of the video image relative to the ground are calculated through a calibrated camera installation height and the distance of the nearest end of the visual field; the distance value from the top of the object in the video image to the edge of the bottommost portion of the image and the distance value from the bottom of the object in the video image to the edge of the bottommost portion of the image are measured, the distance from the center of the object to the edge of the leftmost side of the image is also measured, and therefore two corresponding longitudinal visual angles and a transverse visual angle of the object are worked out; finally, the height value of the object and the plane distance from the object to a camera are worked out. The method for extracting the height and the distance of the object in the video image mainly uses the perspective geometry relationship of the angle of an image photographed by the fixed camera relative to the ground and the center projection of the camera, the height and the distance of the object are converted into the visual angles of the image relative to the ground, and therefore the height and the distance of the object can be effectively determined according to two calibrated given values. The method for extracting the height and the distance of the object in the video image has the advantages of being simple and practical.
Description
technical field [0001] The invention relates to the technical field of video image processing, and is a method for effectively extracting the height and distance of objects in video images, so as to accurately measure the height parameters of interested objects (such as pedestrians) and the distance parameters from the root of the camera in the scene. Background technique [0002] With the rapid development of video surveillance systems and a large amount of investment in application systems, people can use video images to realize effective monitoring of various scenes and post-event data analysis. The analysis of the image sequence recorded by the camera is one of the keys to the application of video images. Through the analysis, the positioning, identification and tracking of objects in dynamic scenes can be realized, so as to analyze and judge the behavior of objects, so as to achieve both daily Management can respond effectively in a timely manner when abnormal situation...
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Inventor 张鹏飞李建敏孙彪
Owner BEIJING QIANLISHIKONG SCI & TECH