Video display device and video display method
View Patent ↗A video display device includes: a receiver receiving video information including a bit string which defines a gradation value of an input image with a first frame rate; a video generator generating output images including multiple frames corresponding to a one-frame input image, based on the received video information; and a display displaying the generated output images for each frame rate. The bit string includes an upper bit, a middle bit, and a lower bit which are arranged in descending order therein. The upper bit corresponds to a number of gradations per frame of the output images. The video generator varies the gradation value among multiple frames in the output images according to the middle bit of the input image, and performs spatial dithering to correct the output images according to the lower bit of the input image.
1. A video display device comprising:
a receiver that receives video information including a bit string which defines a gradation value of an input image with a first frame rate;
a video generator that generates a set of output images including multiple frames corresponding to a one-frame input image on a basis of the received video information; and
a display that displays the generated output images for each frame at a second frame rate higher than the first frame rate,
wherein the bit string of the input image includes an upper bit, a middle bit, and a lower bit which are arranged in descending order therein,
the upper bit corresponds to a number of gradations per frame of the output images, and
the video generator varies the gradation value among multiple frames in the set of the output images according to the middle bit of the input image, and performs spatial dithering to correct the output images according to the lower bit of the input image.
2. The video display device according to claim 1 , wherein the video display device according to claim 1 , wherein the video generator calculates a varied gradation value based on a gradation value and a variation value, the gradation value defined by a portion of the bit string from the upper bit to the middle bit in the input image, the variation value varying within a range corresponding to the middle bit, and the varied gradation value indicating a gradation value of each frame in the set of the output images.
3. The videos display device according to claim, wherein the video generator corrects the varied gradation value by applying spatial dithering to a region corresponding to a portion of the input image where the lower bit is a predetermined value.
4. The video display device according to claim 3 , wherein
the frames in the set of the output images have different variation values from one another, and
the generator corrects the varied gradation value of a frame having a predetermined variation value on the set of the output images by applying spatial dithering to the frame having the predetermined variation value.
5. The video display device according to claim 4 , wherein the video generator changes an order of the frame having the predetermined variation value in the set of the output images for each frame of the input image.
6. The video display device according to claim 1 , wherein the video generator performs spatial dithering to correct the output images according to the loser bit, based on a dither pattern indicating a predetermined spatial distribution.
7. The video display device according to claim 6 , further comprising a memory that stores therein the dither pattern,
wherein the video generator performs spatial dithering to correct the output images according to the lower bit, with reference to the dither pattern stored in the memory.
8. The video display device according to claim 6 , wherein
the dither pattern includes multiple patterns, and
the video generator sequentially switches a pattern used for each frame of the input image among the multiple patterns.
9. The video display device according to claim 1 , further comprising a distance information generator that generates distance information indicating a distance to an object,
wherein the display is configured by a projection device that projects the output images onto the object, and
the video generator generates an output image of each frame according to the distance information acquired from the distance information generator.
10. A video display method comprising:
receiving, by a receiver, video information including a bit string that defines a gradation value of an input image with a first frame rate;
generating, by a video generator, a set of output images including multiple frames corresponding to a one-frame input image on a basis of the received video information; and
displaying, by a display, the generated output images for each frame at a second frame rate higher than the first frame rate,
wherein the bit string of the input image includes an upper bit, a middle bit and a lower bit which are arranged in descending order therein,
the upper bit corresponds to a number of gradations per frame of the output images, and
the video generator varies the gradation value among multiple frames in the set of the output images according to the middle bit of the input image, and performs spatial dithering to correct the output images according to the lower bit of the input image.