Three-dimensional display device and digital zoom correction method
A digital zoom rate of two-dimensional images zoomed by a digital zoom unit is obtained. When the obtained digital zoom rate is larger than 100%, at least one of the digitally zoomed two-dimensional images is modified based on an enlarged amount of parallax to provide an amount of parallax between the digitally zoomed two-dimensional images equal to the enlarged amount of parallax. The enlarged amount of parallax is obtained by enlarging, at a moderated digital zoom rate, an amount of parallax between the two-dimensional images before being digitally zoomed, and the moderated digital zoom rate is obtained by moderating the digital zoom rate at a moderation rate, where the moderation rate increases as the zoom rate increases. Then, a display unit is caused to carry out three-dimensional display based on the modified two-dimensional images.
1. A three-dimensional display device comprising:
display section for carrying out three-dimensional display based on two or more two-dimensional images having parallax therebetween;
digital zoom section for digitally zooming the two-dimensional images;
zoom rate obtaining section for obtaining a digital zoom rate of the two-dimensional images zoomed by the digital zoom section;
parallax modifying section for modifying at least one of the digitally zoomed two-dimensional images based on an enlarged amount of parallax to provide an amount of parallax between the digitally zoomed two-dimensional images equal to the enlarged amount of parallax when the digital zoom rate obtained by the zoom rate obtaining section is larger than 100%, wherein the enlarged amount of parallax is obtained by enlarging, at a moderated digital zoom rate, an amount of parallax between the two-dimensional images before being digitally zoomed, the moderated digital zoom rate is obtained by moderating the digital zoom rate at a moderation rate, and the moderation rate increases as the zoom rate increases; and
display control section for causing the display section to carry out three-dimensional display based on the modified two-dimensional images.
2. The three-dimensional display device as claimed in claim 1 , wherein
each of the two-dimensional images comprises a low-resolution image and a compressed high-resolution image,
the digital zoom section digitally zooms the low-resolution images,
the parallax modifying section applies the modification to at least one of the digitally zoomed low-resolution images,
the three-dimensional display device further comprises decompressing section for decompressing the compressed high-resolution images, and
the display control section causes the display section to carry out first three-dimensional display based on the modified low-resolution images, and then, in place of the first three-dimensional display, the display control section causes the display section to carry out second three-dimensional display based on the decompressed high-resolution images decompressed by the decompressing section, the decompressed high-resolution images being displayed correspondingly to a three-dimensional display range based on the modified low-resolution images.
3. The three-dimensional display device as claimed in claim 2 , wherein
the display section is capable of three-dimensional display based on the two-dimensional images and two-dimensional display of one of the two-dimensional images,
when the two-dimensional display of one of the two-dimensional images is carried out, the display control section causes the display section to carry out first two-dimensional display of one of the digitally zoomed low-resolution images, and then, in place of the first two-dimensional display, the display control section causes the display section to carry out second two-dimensional display of corresponding one of the decompressed high-resolution images decompressed by the decompressing section, the high-resolution image being displayed correspondingly to a two-dimensional display range of the digitally zoomed low-resolution image, and
the three-dimensional display device further comprises time setting section for setting a time period from the start of the first two-dimensional display of the digitally zoomed low-resolution image to the start of the second two-dimensional display of the decompressed high-resolution image shorter than a time period from the start of the first three-dimensional display based on the modified low-resolution images to the start of the second three-dimensional display based on the decompressed high-resolution images.
4. A digital zoom correction method to be carried out in a three-dimensional display device including display means for carrying out three-dimensional display based on two or more two-dimensional images having parallax therebetween, and digital zoom means for digitally zooming the two-dimensional images, the method comprising the steps of:
obtaining a digital zoom rate of the two-dimensional images zoomed by the digital zoom means;
modifying at least one of the digitally zoomed two-dimensional images based on an enlarged amount of parallax to provide an amount of parallax between the digitally zoomed two-dimensional images equal to the enlarged amount of parallax when the digital zoom rate is larger than 100%, wherein the enlarged amount of parallax is obtained by enlarging, at a moderated digital zoom rate, an amount of parallax between the two-dimensional images before being digitally zoomed, the moderated digital zoom rate is obtained by moderating the digital zoom rate at a moderation rate, and the moderation rate increases as the zoom rate increases; and
causing the display means to carry out three-dimensional display based on the modified two-dimensional images.
5. The digital zoom correction method as claimed in claim 4 , wherein
each of the two-dimensional images comprises a low-resolution image and a compressed high-resolution image,
the digital zoom means digitally zooms the low-resolution images,
the modification of the parallax is applied to at least one of the digitally zoomed low-resolution images,
the compressed high-resolution images are decompressed, and
first three-dimensional display is carried out based on the low-resolution images with the amount of parallax therebetween modified, and then, in place of the first three-dimensional display, second three-dimensional display is carried out based on the decompressed high-resolution images, the decompressed high-resolution images being displayed correspondingly to a three-dimensional display range based on the modified low-resolution images.
6. The digital zoom correction method as claimed in claim 5 , wherein
the display means is capable of three-dimensional display based on the two-dimensional images and two-dimensional display of one of the two-dimensional images,
when the two-dimensional display of one of the two-dimensional images is carried out, the display means is caused to carry out first two-dimensional display of one of the digitally zoomed low-resolution images, and then, in place of the first two-dimensional display, the display means is caused to carry out second two-dimensional display of corresponding one of the decompressed high-resolution images, the high-resolution image being displayed correspondingly to a two-dimensional display range of the digitally zoomed low-resolution image, and
a time period from the start of the first two-dimensional display of the digitally zoomed low-resolution image to the start of the second two-dimensional display of the high-resolution image is set shorter than a time period from the start of the first three-dimensional display based on the modified low-resolution images to the start of the second three-dimensional display based on the high-resolution images.