Image recognition device, image recognition method and image recognition unit

An image recognition device used in an image display unit including an imaging device adapted to image an image display surface, and a detecting image display device adapted to display a detecting image on the image display surface, the image recognition device comprising:

• a pattern display section adapted to make the detecting image display device display a first pattern having a first linear pattern varying in luminance with a first pitch along a direction parallel to an epipolar line determined from a positional relationship between the imaging device and the detecting image display device, and a second linear pattern varying in luminance with a second pitch different from the first pitch along a direction parallel to the epipolar line;
• a measurement point determination section adapted to detect an object located between the imaging device and the image display surface to determine a measurement target point of the object;
• and
• a position detection section adapted to detect a position of the measurement target point with respect to the image display surface based on an image including the measurement target point and the first pattern obtained by the imaging device, wherein
• the first linear pattern and the second linear pattern are displayed simultaneously.