From the main menu to enter the brush to choose, there will be some facial recognition thermometer brush: ordinary pen, fluorescent pen, writing brush, combination brush pen. In addition to the fluorescent pen, you can choose according to his be fond of, and then set the color, thickness, etc. Unlike the first three, fluorescent pen is a translucent pen, usually used to comment on. Please note that it does not completely cover what you paint. In fact, set other pen can also have the same function with the fluorescent pen, this needs in the custom attributes of the pen set transparency, completely opaque by default.
An eraser is limited, you need to know.
Beginners always think to use an eraser can erase the content of face detection android the whiteboard. An eraser function limit is actually very few. * : can erase ordinary pen, fluorescent pen, writing brush, the contents of combination brush pen tool draw, this is also a premise, just can't put you written in
By gathering around the display area of infrared receiving and transmitting tube scanning grid of horizontal and vertical direction, the scanning grid. When the object to block in the grid when a pair of vertical and horizontal scan lines, X and Y coordinates can block the horizontal and vertical direction of infrared to determine position.
Electronic whiteboard adopts pressure input method, equivalent to a computer touch screen. When the teacher touch screen with finger or pen of real options, the computer will automatically processing operations. In fact, the electronic whiteboard internal has two layers of pressure sensitive film. When there is pressure of a point on the surface of the whiteboard, two layers of film forming short circuit on this point. Electronic whiteboard controller to detect pressure point coordinates, and through the interface to the computer.
On both sides of screen placed two fixed distance distribution face recognition identification of ultrasonic receiver. Used to locate the pen is ultrasonic transmitter. When the pen moves to the screen surface, the launch of the ultrasonic along the screen surface has been detected by the receiver. Receive the ultrasonic time can convert pen distance with two receivers.
Interactive electronic whiteboard can be divided into pressure induction, electromagnetic induction, infrared, ultrasonic, CCD and other categories. Each technology has its characteristics and advantages, have a certain share in the market. According to the analysis of the international authoritative market research institutions, in recent years, electromagnetic induction technology and pressure sensing technology electronic whiteboard to occupy the market dominant position, followed by ultrasonic and infrared.