Method for automatically identifying action of writing on blackboard of teacher in class video recording

Abstract

The invention discloses a method for automatically identifying the action of writing on blackboard of a teacher in class video recording, which belongs to image recognition technology in a long-distance educational system, which comprises the following processing steps: a, capturing a frame of image by using a frame grabber, subtracting a previous frame of image from the current image to obtain a binary frame difference image and analyzing the binary frame difference image; b, subjecting the binary frame difference image to closed operation in mathematical morphology, marking communicated regions and removing obvious noise regions in the binary frame difference image by setting a threshold; c, acquiring a target rectangular frame and calculating the area of the rectangle, determining the movement of a human body when the area of the rectangle meets a certain condition and detecting and identifying the behavior of the writing of the teacher on the blackboard; d, when the more than 5 successive frames of images of behavior of writing on the blackboard are detected, stretching a camera; and e, if no 50 successive frames of images of the behavior of writing on the blackboard are detected, restoring the stretching magnification to an initial magnification.

Description

technical field [0001] The invention is an automatic recognition algorithm for a teacher's writing action on a blackboard in a classroom video, which belongs to the image recognition technology in a distance education system. Background technique [0002] As an effective and economical way of learning, distance education has been more and more recognized. One of the key factors restricting the development of distance education is the lack of course video resources. The reason is the relatively cumbersome manual production process of teaching live video. At present, shooting teaching videos requires a dedicated videographer to go to the classroom to shoot the whole process, or teachers teach in a dedicated recording classroom, which is relatively expensive. Therefore, making the filming equipment automatic and intelligent, does not require the participation of a special photographer, can be conveniently placed in ordinary classrooms, and has broad application prospects. [...

AI Technical Summary

Problems solved by technology

One of the key factors restricting the development of distance education is the lack of course video resources. The reason is the cumbersome manual production process of teaching live videos

At present, shooting teaching videos requires a dedicated videographer to go to the classroom to shoot the whole process, or teachers teach in a dedicated recording classroom, which is relatively expensive

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