Image processing device, projector, and image processing method

A projector equipped with an image processing device adapted to correct a keystone distortion of an image projected on a region where a first plane and a second plane intersect with each other at a predetermined angle, the projector comprising:

• a transformation section adapted to calculate a first coordinate with a first designated vertex to be referred to in a first coordinate transformation for correcting the keystone distortion and a second coordinate with a second designated vertex to be referred to in a second coordinate transformation for correcting the keystone distortion;
• a combination section adapted to generate a composite coordinate obtained by combining the first coordinate and the second coordinate calculated by the transformation section;
• a correction section adapted to perform a coordinate transformation for correcting the keystone distortion using the composite coordinate generated by the combination section;
• and
• a projection section adapted to project the image on which the correction section has performed the coordinate transformation, wherein
• the first coordinate transformation is a transformation in which discontinuity can occur in the image on an intersection line between the first plane and the second plane,
• the second coordinate transformation is a transformation in which no discontinuity occurs in the image on the intersection line,
• the combination section combines the first coordinate and the second coordinate with each other while weighting the first coordinate and the second coordinate, and
• the combination section combines the first coordinate and the second coordinate with each other so that the weight of the second coordinate increases as a distance from the intersection line between the first plane and the second plane decreases.

An image processing method adapted to correct a keystone distortion of an image projected on a region where a first plane and a second plane intersect with each other at a predetermined angle, the image processing method comprising:

• calculating a first coordinate with a first designated vertex to be referred to in a first coordinate transformation for correcting the keystone distortion and a second coordinate with a second designated vertex to be referred to in a second coordinate transformation for correcting the keystone distortion;
• generating a composite coordinate obtained by combining the first coordinate and the second coordinate calculated in the calculating;
• and
• performing a coordinate transformation for correcting the keystone distortion using the composite coordinate generated in the generating, wherein
• the first coordinate transformation is a transformation in which discontinuity can occur in the image on an intersection line between the first plane and the second plane,
• the second coordinate transformation is a transformation in which no discontinuity occurs in the image on the intersection line,
• in the generating, the first coordinate and the second coordinate are combined with each other while weighting the first coordinate and the second coordinate, and
• in the generating, the first coordinate and the second coordinate are combined with each other so that the weight of the second coordinate increases as a distance from the intersection line between the first plane and the second plane decreases.