Patent ID: 7554545

Claim:
A drawing apparatus comprising: an image capturing device operable to generate an image signal by capturing an image of an operation article operated in the air; a state information calculating unit operable to calculate state information of said operation article on the basis of said image signal; a following object control unit operable to control display of a following object in accordance with said state information of said operation article so that said following object follows motion of said operation article; a drawing control unit operable to control drawing on a display device on the basis of a motion path of said following object; a stroboscope operable to direct light onto said operation article at a predetermined interval, wherein said image capturing device generates a lighted image signal and a non-image signal by capturing images of said operation article respectively when said stroboscope is lighted and non-lighted; and a differential signal generating unit operable to generate a differential signal between said lighted image signal and said non-lighted image signal, wherein said state information calculating unit calculates said state information of said operation article on the basis of said differential signal.