Laser pen based projection writing method and system

Abstract

The invention discloses a laser pen based projection writing method and system. The method includes steps: step one, dividing a projection plane into a projection image display area and a projection writing area, projecting an initial projection image on the projection plane through a projector, and displaying in the projection image display area; step two, emitting marking light spots by a laserpen, marking a text writing position on the initial projection image, and acquiring a marked real-time projection image through an image acquisition device to obtain a text writing position pattern onthe projection image display area; step three, subjecting the text writing position pattern to feature extraction to obtain the text writing position; step four, emitting light rays by the laser pen,writing in the projection writing area, and displaying written texts in the projection writing area. The laser pen based projection writing method and the system have advantages that the projection image can be annotated by writing in the projection writing area through the laser pen, and accordingly projection teaching is greatly facilitated.

Description

technical field [0001] The present invention relates to the technical field of projection, in particular to a laser pen-based projection writing method and system thereof. Background technique [0002] A projector, also known as a projector, is an electronic device that can project text, images, videos, and other content onto a screen. Education, business, government, and home entertainment are the four main consumer groups supporting the projector industry, among which the education sector is the pillar area for the future development of the projector industry. According to the 2018 national education statistics, there are 266,700 kindergartens, 213,800 compulsory education schools, 24,400 high school schools, 2,663 ordinary colleges and universities, 2,152 special education schools, and 183,500 private schools of all levels According to the calculation based on the fact that each classroom is equipped with one projector, according to relevant data, the market capacity of ...

AI Technical Summary

Problems solved by technology

The contents output by the computer and projected on the screen are generally slides. During the use, the user needs to perform text annotation operations on the slides. Traditionally, the computer mouse and keyboard are used, or the handwriting tablet is used. There are the following inconveniences: firstly, because the computer generally has a fixed position, its keyboard and mouse can only be fixed within a certain range. During the demonstration and teaching process, it is impossible for the user to fix the position without moving around, which requires frequent return to the fixed position. Operating the mouse and keyboard, this not only brings great inconvenience to the user, but also greatly reduces the excitement of the user's display and teaching

Secondly, the wired tablet also has the above problems. Although the wireless tablet can move with the user, it is often inconvenient to carry the tablet, the stylus is forgotten, the battery of the tablet is dead, and the tablet does not respond. , resulting in the inability to use the wireless tablet, which greatly reduces the user's mood and use effect

In addition, traditional computers and projectors are very large in size, not easy to carry, and the installation and connection process of computers and projectors before use is cumbersome

Therefore, when using a computer and a projector to play slides, the writing on the slides needs to be realized with the help of a mouse, keyboard or other additional hardware devices, which makes it inconvenient to use the combination of a projector and a computer in actual teaching and training. In order to solve the above problems, a A kind of writing method and system for projection based on laser pen

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