Display device, image processing device and image processing method, and computer program
Provided is a display device including an image display unit configured to display an image with a plurality of pixels arranged on a display surface, an eyepiece optical unit configured to project the display surface of the image display unit in a manner that a predetermined angle of view is obtained, and an image correction unit configured to correct a display image on the display surface at a position of each of representative pixels which are discretely located on the display surface, on the basis of distortion generated due to the eyepiece optical unit.
1. A display device comprising:
an image display unit configured to display an image with a plurality of pixels arranged on a display surface;
an eyepiece optical unit configured to project the display surface of the image display unit in a manner that a predetermined angle of view is obtained; and
an image correction unit configured to correct a display image on the display surface at a position of each of representative pixels which are discretely located on the display surface, on the basis of distortion generated due to the eyepiece optical unit,
wherein the image correction unit includes
a motion vector holding part configured to hold a motion vector expressing the distortion generated due to the eyepiece optical unit at the position of the representative pixel,
a vector interpolation part configured to interpolate a motion vector at a position of each pixel other than the representative pixel on the basis of the motion vectors of one or more representative pixels in the neighborhood, and
a pixel correction part configured to provide, by use of the motion vector, distortion in a direction opposite to the distortion generated due to the eyepiece optical unit to each pixel on the display surface and to correct the pixel.
2. The display device according to claim 1 , further comprising:
an optical simulator configured to trace a light ray of the display image in the image display unit passing through the eyepiece optical unit; and
a vector generation part configured to generate the motion vector at the position of the representative pixel on the basis of light ray trace data obtained by the optical simulator.
3. The display device according to claim 1 , further comprising:
a vector generation part generating the motion vector at the position of the representative pixel by actually shooting a virtual image projected by the eyepiece optical unit when the representative pixel is made to be lighted.
4. The display device according to claim 1 , wherein
the image display unit has the display surface vertically longer compared with an aspect ratio of the display image,
the eyepiece optical unit generates a substantially pin-cushion shaped distortion, and
the image correction unit corrects the display image in a manner that an angle of view at a horizontal end is not changed.
5. The display device according to claim 1 , wherein
the pixel correction part separates pixel correction in a vertical direction and pixel correction a horizontal direction and performs a pixel correction process in series for each direction.
6. The display device according to claim 1 , wherein
the pixel correction part moves the pixel in the same vertical line for each line to perform correction in a vertical direction and then subsequently moves the pixel in the same horizontal line for each line to perform correction in a horizontal direction.
7. The display device according to claim 6 , wherein
the pixel correction part finds the motion vector in the horizontal direction at a position moved by an amount of the motion vector in the vertical direction.
8. The display device according to claim 1 , further comprising:
a modulation part configured to shift the position of the display image at low frequency,
wherein
the image correction unit corrects the display image having been subjected to a modulation process by the modulation part while shifting a correspondence relationship a pixel position and the motion vector,
the image display unit has a function to shift a display position for burn-in prevention, and
the shift of the image correction unit and the shift of the image display unit are made to operate in conjunction with each other.
9. The display device according to claim 1 , further comprising:
a scaling part configured to scale the display image in conformity to the number of pixels of the display surface of the image display unit,
wherein
the image correction unit corrects the display image on a line memory, and
the image display unit drives at a timing for making a size of the line memory minimum.
10. A non-transitory computer-readable medium having stored thereon a program for causing a display device to perform a correction method,
in which said display device includes an image display unit configured to display an image with a plurality of pixels arranged on a display surface and an eyepiece optical unit configured to project the display surface of the image display unit in a manner that a predetermined angle of view is obtained,
said method comprising:
correcting a display image on the display surface at a position of each of representative pixels which are discretely located on the display surface, on the basis of distortion generated due to the eyepiece optical unit,
in which the correcting includes
holding a motion vector expressing the distortion generated due to the eyepiece optical unit at the position of the representative pixel,
interpolating a motion vector at a position of each pixel other than the representative pixel on the basis of the motion vectors of one or more representative pixels in the neighborhood, and
providing, by use of the motion vector, distortion in a direction opposite to the distortion generated due to the eyepiece optical unit to each pixel on the display surface and to correct the pixel.