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Video OSD extraction and coverage area reconstruction method

A coverage area and video technology, applied in the field of electronic monitoring, can solve the problem of uncertain location of OSD information, achieve the effect of improving credibility and recognition accuracy

Active Publication Date: 2020-05-08
杭州亿圣信息技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In the OSD of video surveillance, the use of video analysis to select non-portrait positions or relatively low-frequency areas will lead to uncertain positions of OSD information, and even cause mobile phone information (which may collect multiple mobile phone information) to be split and superimposed in different positions; the background cannot be avoided. high coincidence

Method used

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Embodiment Construction

[0054] The inventive method specifically comprises:

[0055] (1). Receive video images and select frames: monitor video through standard protocols (for example, public security video surveillance can adopt national standard GB / T28181-2016) or open network video interface forum interface protocol (ONVIF) to access, and obtain a list of video resources Afterwards, the video stream channel is opened for continuous video stream access; the back-end system decodes the video stream and converts YUV signals, selects and extracts video frames (for example, key frames can be extracted).

[0056] (2). Perform OCR text recognition: the background system uses the existing OCR technology to extract the text area from the fixed position in the image through the video image in accordance with the requirements of the "Video Image Text Labeling Specification" (GA / T751-2008), and the OSD information is general It is fixed on the upper and lower parts of the video image, and the area can also be...

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Abstract

The invention discloses a video OSD extraction and coverage area reconstruction method. According to the method, video analysis, front and back frame time calculation, position calculation, interpolation and other methods are adopted to perform information extraction and correction, and video reconstruction and restoration are performed on an original OSD shielded area after information extraction. According to the method, OSD information extraction of the video monitoring image is realized through view analysis; time calculation is carried out through comparison of front and back frame identification numbers; oCR identification accuracy threshold alarm is set; calibration data collected by means of front and back frame verification, identification accuracy early warning and human assistance is used as a sample set for OCR model training. And the OSD information is used as a view to be sent to a background view in a structured mode for data mining of view big data, and background reconstruction of an OSD area is achieved through interpolation of a front and back frame interval average method. According to the method, the identification accuracy and the credibility of OSD information extraction are improved.

Description

technical field [0001] The invention belongs to the technical field of electronic monitoring, in particular to the cross technical field of video intelligent identification and wireless communication, and relates to a method for video OSD extraction and coverage area reconstruction. Background technique [0002] OSD (On Screen Display) is used on CRT / LCD monitors to generate some special fonts or graphics on the screen of the monitor so that users can get some information. It is commonly used on the display screen of home TV or personal PC computer. When the user operates the TV to change channels or adjust the volume, picture quality, etc., the TV screen will display the current status to let the user know. This control IC can be used on the screen Any position on the screen can display some special fonts and graphics, and become an important information generating device on the man-machine interface. As a video character overlay display technology, the text information is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/32G06K9/62
CPCG06V20/635G06V30/10G06F18/22G06F18/214
Inventor 杨工明李衡徐勇周子容叶隽毅李嘉仪
Owner 杭州亿圣信息技术有限公司
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