Screen laser pointer tracking laser pointer application

In the multi-projector screen demonstration in large and medium-sized conference center, due to the lack of connection between the primary and secondary screens, the laser pointer points on the primary and secondary screens cannot be displayed on the secondary screen, resulting in poor demonstration effect. Therefore, a demonstration method of laser pointer tracking on multi-projection screen based on camera is proposed. The connection between the main projection area and the computer monitor is established through the camera, and the laser pointer point is converted from the main projection area to the computer monitor, so as to control the movement of the cursor, so that the second projection screen also has the effect of the computer cursor. The main steps include: the calibration of the projection transformation matrix H between the main projection area based on monochromatic projection and the computer display; Laser pointer points are extracted from the main screen images. According to the projection transformation matrix H, the coordinates of the laser pointer point on the computer display screen are calculated, and the computer cursor is controlled to follow to the specified position. Experiments show that the horizontal and vertical tracking errors of the following demonstration method are within 5 pixels on the computer display, and the laser pointer position can be well tracked on the secondary screen, thus freeing the speech space and communicating with the whole audience. The purpose of communication.