JP2002238064A5 - - Google Patents

Description

0005
[Means for solving problems]
In order to solve the above problems, the large screen display device of the present invention divides an original image into a plurality of parts and generates an image signal of a plurality of images having an overlap region between adjacent images. A large-screen display device including an image signal generation means and a plurality of projection-type displays for continuously arranging and projecting the plurality of images on a screen based on the plurality of image signals output from the image signal generation means. In, the plurality of image signals input to each projection type display are converted and output according to a brightness conversion function that defines the relationship between the input brightness and the output brightness set corresponding to each projection type display. Brightness that corrects the brightness conversion function so that the conversion means and the brightness of the image of the overlap region displayed on the screen by the plurality of projection displays are gradually lowered from the overlap start point to the end point of the images. A conversion function correction means, a camera that sets the brightness conversion function to a predetermined reference brightness conversion function and captures a common image projected on the screen by each projection type display, and the camera captured by the camera. It is provided with a luminance conversion function calculating means for obtaining a luminance difference between common images, calculating the luminance conversion function corresponding to each projection type display so as to reduce the luminance difference, and setting the luminance conversion function in the luminance conversion means. It is characterized by being.

When configuring the large screen display device, a plurality of cameras are provided instead of a single camera, and the luminance conversion function calculation means is an image of each camera that captures a common image projected by the same projection type display. In obtaining the luminance sensitivity difference of the signal and obtaining the luminance difference between the common images, the luminance difference can be corrected by the luminance sensitivity difference of the camera that captured the image.

Further, as the common image, an image whose brightness changes with time from 0 to the maximum value can be used.

Further, as the above-mentioned luminance conversion function correction means, the luminance conversion function of the image portion corresponding to the overlap region is subjected to 1 to 1 from the overlap start point of the overlap region toward the overlap end point indicating the end of each image. A means for correcting by multiplying by a magnification that sequentially lowers to 0 can be used.

According to the present invention , prior to displaying a plurality of images continuously side by side on the screen, the reference luminance conversion function is used as the luminance conversion function of each luminance conversion means, and the above-mentioned projection is performed by each projection type display. Based on the video signal when the common image based on the reference brightness conversion function is taken by the camera, the mutual brightness difference of the common image is obtained, and the brightness correction value is calculated corresponding to each projection type display. , Since the luminance conversion function peculiar to each luminance conversion means is calculated and set according to each calculated luminance correction value, even if there is a difference in luminance between the projection type displays, the seam of each image is taken. Can be displayed smoothly.

Further, when a plurality of cameras are provided, the brightness conversion function calculation means projects the common image projected by the same projection type display by each projection type display based on the difference in brightness sensitivity of the video signal of each camera. Since the brightness difference between the common images is obtained and the brightness conversion function corresponding to each projection type display is calculated and set so as to reduce this brightness difference, a camera is configured between a plurality of cameras. Even if there is a difference in brightness due to an individual difference in the image pickup element or the like, the individual difference between the cameras can be absorbed and the sensitivity between the cameras can be corrected to an appropriate value.

Claims (4)

Image signal generation means for generating an image signal of a plurality of images formed by dividing an original image into a plurality of portions and having an overlap area between adjacent images, and the plurality of the output from the image signal generation means And a plurality of projection-type displays for sequentially arranging and projecting the plurality of images on a screen based on the image signals of
Luminance conversion means for converting and outputting the plurality of image signals input to the respective projection displays in accordance with a luminance conversion function which defines the relationship between the input luminance and the output luminance which are set in correspondence with the respective projection displays And a luminance conversion function that corrects the luminance conversion function so that the luminance of the image of the overlap area displayed on the screen by the plurality of projection displays is gradually lowered from the overlap start point to the end point of the images. A correction unit, a camera setting the brightness conversion function to a predetermined reference brightness conversion function, and shooting a common image projected on the screen by each of the projection type displays, and the common image shot by the camera The luminance corresponding to each of the projection-type displays so as to determine the luminance difference between them and reduce the luminance difference. Large-screen display device to calculate the degree conversion function, characterized by comprising a luminance conversion function calculating means for setting the luminance conversion means. The large screen display apparatus according to claim 1, wherein the common image is an image in which the luminance changes from 0 to a maximum value . The luminance conversion function correction means performs 1 to 0 on the luminance conversion function of the image portion corresponding to the overlap region, from the overlap start point of the overlap region toward the overlap end point indicating the end of each image. The large screen display apparatus according to claim 1 or 2, wherein the correction is performed by multiplying the magnification by which it is sequentially reduced until it is corrected . Equipped with a plurality of the cameras,
The luminance conversion function calculation means calculates a luminance sensitivity difference of the video signal of each camera which photographed the common image projected respectively by the same projection type display, and calculates a luminance difference between the common images. The large screen display apparatus according to any one of claims 1 to 3, wherein the brightness difference is corrected based on the brightness sensitivity difference of a camera that has photographed the brightness difference .