A recognition device laser point and positioning coordinates The laser points to the projection screen. The device includes a foreground calculation unit, a threshold estimation unit, a green laser pointer detection unit, and a positioning unit, wherein the foreground calculation unit is used to calculate the foreground image of the image taken by the photographing device. The threshold value estimation unit is used for automatically estimating the threshold values of the brightness, saturation and hue of the pixels in the foreground image according to the foreground image calculated by the foreground calculation unit in the initial stage of the device. This laser point detection unit is used to detect the laser point based on the foreground image, the brightness and saturation of the pixel and the hue threshold; the positioning unit is used to calculate the coordinates of the laser. According to the captured image point, the laser detects the point. The laser point detection unit. With the needs of users and the development of technology, it is developed and projected on the screen, and a virtual whiteboard system or speech system laser pointer (laser pointer) is used as the input medium.
A laser pointer U disk, including a pen body 1, the pen body I includes a front penholder 2 and a rear penholder 3, the front penholder 2 is provided with a top cap 4, and the center of the top cap is provided with a hole 5, The inside of the front barrel 2 is provided with a laser emitting device, and the laser beam emitted by the high powered laser emitting device passes through the hole; the rear barrel 3 is provided with a USB plug 6 which is connected to the memory chip 7, The storage chip 7 is arranged inside the rear penholder 3; the front penholder 2 and the rear penholder 3 are provided with a connecting piece 14 where one end of the connecting piece 14 is threadedly connected to the front penholder 2. The other end of the connecting piece 14 is provided with a receiving groove 15, and the USB plug 6 is placed in the receiving groove 15.