Abstract: A digitizer device with anti-noise and status display having a hardware circuit controlled by a software program to eliminate outside noises. The system includes a cursor control mouse or stylus which emits an oscillating signal at several hundred KHz to induce a X-Y grid, an anti-noise circuit which eliminates outside noises from the induced signal, an ADC converter which converts the induced signal into a digital signal, a microcontroller unit which calculates the induced signal into corresponding X-Y axis coordinate value, and a display which shows the current status of the digitizer.

Abstract: A digitizer comprising a microprocessor, a quartz oscillator, a cursor or stylus, an overlapped loop assembly, a peak phase recognizer, an analog/digit converter and other matching devices including multiplexers, amplifiers, filters and etc., wherein the overlapped loop assembly includes a plurality of loops for horizontal axis respectively starting from the left and the middle and a plurality of loops for vertical axis respectively starting from the bottom and the middle to overlap on the loops for horizontal axis forming into an induction area, the first loop for the horizontal axis at the left being connected to the first loop for the horizontal axis at the middle and the posterior loops for the horizontal axis at the left as well as the loops for the vertical axis at the bottom being respectively connected to the posterior loops for the horizontal axis at the middle and the loops for the vertical axis at the middle.

Abstract: A scanner system with local scanning capability for graphic reading, which comprises a tablet, a scanner, a stylus or cursor control mouse and a main frame CPU. The scanner comprises a plurality of oscillators (induction coils) at both sides by the light source thereof to produce induced current on the plane of circuit of the tablet. The CPU of the tablet obtains the X,Y coordinate data of the oscillators through sample-and-hold amplifier circuit and A/D converter circuit. Simultaneously, the scanner projects light to reflect the picture to CCD so as to record the start and end location of every line. After a picture is read by the scanner the digital data of every line of the image and the X, Y coordinate data of the start and end location of every line of the image are stored in the storage of the main frame for further graphic data processing through its CPU so that any image distortion can be modified and local scanning can be achieved.