Three-dimensional video image processing device and three-dimensional video image processing method

1. A three-dimensional video image processing device that performs processing of rotating a stereoscopic image about a virtual rotation axis extending in parallel to an image plane, the device comprising:

a displacement map generation section that compares a first viewpoint image and a second viewpoint image of the stereoscopic image with each other to generate a displacement map indicating a displacement of the second viewpoint image relative to the first viewpoint image;

a first new image generation section that performs rotation processing on the first viewpoint image about the virtual rotation axis in accordance with a given rotation angle to generate a new first viewpoint image;

a displacement map correction section that performs correction processing on the displacement map on the basis of the virtual rotation axis and the rotation angle to generate a corrected displacement map; and

a second new image generation section that generates a new second viewpoint image from the new first viewpoint image on the basis of the corrected displacement map.

2. The three-dimensional video image processing device of claim 1 , wherein

the correction processing includes coordinate moving processing, which is common to coordinate moving processing in the rotation processing and transformation processing for displacement amount, which is different from enlargement and reduction of an image in the rotation processing.

3. The three-dimensional video image processing device of claim 2 , wherein

in the transformation processing, the displacement map correction section corrects a displacement amount of an area located at one side of the virtual rotation axis used in the rotation processing to be a value indicating a nearer position in a depth direction and corrects a displacement amount of an area located at the other side of the virtual rotation axis to be a value indicating a more distant position in the depth direction.

4. The three-dimensional video image processing device of claim 2 , wherein

when the virtual rotation axis used in the rotation processing is located at an edge portion of the image plane or outside the image plane, the displacement map correction section corrects, in the transformation processing, each of displacement amounts of all or a part of areas to be a value indicating a nearer position in a depth direction or each of displacement amounts of all or a part of areas to be a value indicating a more distant position in the depth direction.

5. The three-dimensional video image processing device of claim 1 , wherein

the second new image generation section generates the new second viewpoint image by displacing the new first viewpoint image on the basis of the corrected displacement map.

6. The three-dimensional video image processing device of claim 5 , wherein

the second new image generation section generates the new second viewpoint image such that a relative positional relationship between subjects in a stereoscopic image made of the new first viewpoint image and the new second viewpoint image matches a relative positional relationship determined on the basis of the corrected displacement map.

7. The three-dimensional video image processing device of claim 1 , wherein

when the rotation angle is a minute value, the processing performed in the first new image generation section and the processing performed in the second new image generation section are stopped.

8. A three-dimensional video image processing method in which processing of rotating a stereoscopic image about a virtual rotation axis extending in parallel to an image plane is performed, the method comprising:

comparing a first viewpoint image and a second viewpoint image of the stereoscopic image with each other to generate a displacement map indicating a displacement of the second viewpoint image relative to the first viewpoint image;

performing rotation processing on the first viewpoint image about the virtual rotation axis in accordance with a given rotation angle to generate a new first viewpoint image;

performing correction processing on the displacement map on the basis of the virtual rotation axis and the rotation angle to generate a corrected displacement map; and

generating a new second viewpoint image from the new first viewpoint image on the basis of the corrected displacement map.

9. A non-transitory computer-readable recording medium that records a program causes a computer to execute a three-dimensional video image processing method in which processing of rotating a stereoscopic image about a virtual rotation axis extending in parallel to an image plane is performed, the program causing the computer to execute:

comparing a first viewpoint image and a second viewpoint image of the stereoscopic image with each other to generate a displacement map indicating a displacement of the second viewpoint image relative to the first viewpoint image;

performing rotation processing on the first viewpoint image about the virtual rotation axis in accordance with a given rotation angle to generate a new first viewpoint image;

performing correction processing on the displacement map on the basis of the virtual rotation axis and the rotation angle to generate a corrected displacement map; and

generating a new second viewpoint image from the new first viewpoint image on the basis of the corrected displacement map.