Patent ID: 9443491
Filing Date: 2016-09-13
CPC Classification: G03B,G06F,G09G,H04N

Claim Text:
1. An information display apparatus comprising: a main image tone value modification part configured to modify the tone value to compress the tone of a main image according to a formula (1): where b′ and b are the luminance values of each pixel of each of the main image, a a first projector configured to project the main image with compressed tones by the main image tone value modification part with a first polarization component; a sub-image tone value modification part configured to correct tones of a sub-image according to a formula (2): where a′ and a are the luminance values of each of pixel of each of a modified sub-image (A′) and the original sub-image (A), and T is a parameter for correcting the luminance levels of projectors; a correction image generation part configured to generate the correction image according to a formula (3): where c is the luminance value of each pixel of the correction image and γ is the γ value of a projector for projecting a correction image; and a second projector configured to project the correction image with a second polarization component different from the first polarization component overlaying to the main image projected by the first projector such that the main image is buried by overlapped projection of the main image and the correction image generated by using the sub-image and the offset value to provide the sub-image to a viewer with naked eyes and to provide the main image to another viewer with a polarizer.