Image display apparatus and method, computer program product, and image processing device

An image display method comprising:

• obtaining, on the basis of a detection result from a detector configured to detect a viewer, a second position of the viewer in a second coordinate system fixed to the detector;
• calculating a difference between a first position in a first coordinate system fixed to a displaying device capable of displaying a three-dimensional image and the second position;
• and
• calculating a correction value for at least one of a set position of a viewing zone in which the viewer can view the three-dimensional image and the second position so as to compensate for the difference.

A computer program product comprising a computer-readable medium including programmed instructions, wherein the instructions, when executed by a computer, cause the computer to execute:

• obtaining, on the basis of a detection result from a detector configured to detect a viewer, a second position of the viewer in a second coordinate system fixed to the detector;
• calculating a difference between a first position in a first coordinate system fixed to a displaying device capable of displaying a three-dimensional image and the second position;
• and
• calculating a correction value for at least one of a set position of a viewing zone in which the viewer can view the three-dimensional image and the second position so as to compensate for the difference.

An image processing apparatus comprising:

• an obtaining device configured to obtain, on the basis of a detection result from a detector configured to detect a viewer, a second position of the viewer in a second coordinate system fixed to the detector;
• a first calculator configured to calculate a difference between a first position in a first coordinate system fixed to a displaying device capable of displaying a three-dimensional image and the second position;
• and
• a second calculator configured to calculate a correction value for at least one of a set position of a viewing zone in which the viewer can view the three-dimensional image and the second position so as to compensate for the difference.