JP2008312099A - Projected image correcting equipment and projection equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide projection image correction equipment and projection equipment, capable of reducing processing time and cost, separating an original image, and deforming and correcting each separated image according to the three-dimensional shape of a projected plane, while preventing projections image distortions in projecting a high-definition image, as it is, on a high-definition projector, and being capable of projecting images, without missing of pixels at the boundary of each corrected image during image composition on the high definition projector. <P>SOLUTION: When an original image 3 is separated into a plurality of images, and each separated image is composited on a projector 1 and projected on a screen, each of image clipping units 5a, 5b to 5N clips the separated images, which are in the range not to cause missing pixels on the boundary of each separated image composited on the projector, from the original image and then output them to image deformation units 7a, 7b to7N; and each of the image deformation units deforms and corrects the separated images so as to prevent distortions of the projection image and output the images to the projector 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a projection image correction apparatus and a projection apparatus that project an original image by deforming and correcting the projection image so that the projection image is not distorted according to the three-dimensional shape of the projection surface.

  As a conventional technique, when projecting a high-definition image on a screen, a plurality of low-definition projectors are used, and the original image is divided according to the projection position of each of the plurality of low-definition projectors. A method of projecting on a screen by a projector and combining on the screen is known (for example, Patent Documents 1, 2, and 3 below). However, in this method, it is necessary to prevent the boundary between the divided images projected on the screen from being interrupted.

FIG. 5 shows a method for preventing this. First, when the original image 3 shown in FIG. 5A is divided into two left and right images 4a and 4b, the original images 3 are divided so that the boundaries of the divided images 4a and 4b overlap as shown in FIG. 5B. . Then, when the divided images 4a and 4b are synthesized and projected on the screen, the projected images 9a and 9b are projected so as to coincide with each other as shown in FIG. A projection image 9 that does not exist is realized. However, this method has a problem that the width B of the combined projection image 9 is smaller than the width A of the original image 3.

Further, as a conventional technique, a screen for projecting a high-definition image is enormous, so the projection surface is not two-dimensional but three-dimensional depending on the projection angle of the projector, the installation angle of the screen, the shape, etc. Since the projected image is distorted when projected, a method is known in which the original image is deformed and corrected in accordance with the three-dimensional shape of the projection surface so that the projected image is not distorted (for example, Patent Documents 2 and 3 below). As a method for detecting the data of the three-dimensional shape of the projection surface, as shown in Patent Document 2, a plurality of marker images with equal vertical and horizontal intervals are input to the projector and projected onto the screen, and based on the position of the projected image of the marker. There are known methods for detecting them. Then, the original image is deformed and corrected so that the positions of the projected images of the markers are at equal intervals in the vertical and horizontal directions.
JP-A-9-326981 (abstract) Japanese Patent Application Laid-Open No. 2002-72359 (Abstract, FIG. 5) JP 2004-282711 A (abstract)

  Incidentally, in recent years, high-definition projectors that can project high-definition images as they are have been developed. If this high-definition projector is used, a high-definition original image can be projected without being divided, so that it is necessary to prevent the boundary between the divided images synthesized and projected on the screen as in the prior art. Absent. However, for example, in the case of a projector that projects a huge image having a projection surface of 4000 × 2000 pixels, the original image is divided into a plurality of regions and divided into a three-dimensional projection surface due to the performance and cost problems of the current transmission processing system. A method of performing deformation correction and combining on a high-definition projector can be considered. According to this method, it is possible to reduce the processing time and cost compared to the case where a huge image is directly subjected to deformation correction.

FIG. 6 shows, as an example, a horizontally long (width = A, length = B) rectangular original image 3 divided into N (= 4) in the horizontal direction, and divided images 4a, 4b with width C = A / N, length B. 4c and 4d are cut out, and the divided images 4a, 4b, 4c, and 4d are combined on the high-definition projector 1 to project the projected images 9a, 9b, 9c, and 9d on the screen.

  Here, FIG. 7 shows, when the horizontally long rectangular current image 3 shown in FIG. 7A is projected on the screen 10, depending on the projection angle of the projector, the installation angle and shape of the screen 10, and the like shown in FIG. In this way, the projection image is trapezoidal (oblique) and distorted. In this case, first, the original image 3 is divided into four in the horizontal direction as shown in FIGS. 7A and 7B, and then divided images so that the projected image is not distorted as shown in FIG. 7C. 4a, 4b, 4c, and 4d are deformed to generate a corrected image 8a (8b, 8c, and 8d are not shown), and then the corrected image 8 is synthesized on the projector 1 shown in FIG. An image without distortion is projected on the screen 10 shown in FIG. However, in the above method, when the divided images 8a, 8b, 8c, and 8d after correction are synthesized on the projector 1 as shown in FIGS. 8A and 8B, the corrected images 8a, 8b, and 8c are combined. , 8d has a problem that an area with no image (pixel defect) occurs. Therefore, it is necessary to project an image without pixel defects as shown in FIG.

In view of the above problems, an object of the present invention is to provide a projection image correction apparatus and a projection apparatus that can reduce processing time and cost when a high-definition image is projected as it is with a high-definition projector.
The present invention also divides the original image and deforms and corrects each divided image according to the three-dimensional shape of the projection surface so that the projected image is not distorted. It is an object of the present invention to provide a projection image correction apparatus and a projection apparatus capable of projecting an image having no pixel defect at an image boundary.

In order to achieve the above object, the projection image correction apparatus of the present invention provides:
A projection image correction apparatus for dividing an original image into a plurality of images, synthesizing each divided image on a projector and projecting the image on a screen,
A plurality of image cutout means for cutting out each divided image in a range in which no pixel defect occurs at the boundary between the divided images synthesized on the projector, respectively, from the original image;
A plurality of image deformations that are deformed and corrected for each divided image cut out by each of the plurality of image cutout means so that the projection image is not distorted according to the three-dimensional shape of the projection surface of the screen, and output to the projector Means,
Prepared.

In order to achieve the above object, the projection apparatus of the present invention
A projector that combines a plurality of divided images divided from the original image and projects them on a screen;
A plurality of image cutout means for cutting out each divided image in a range in which no pixel defect occurs at the boundary between the divided images synthesized on the projector, respectively, from the original image;
A plurality of image deformations that are deformed and corrected for each divided image cut out by each of the plurality of image cutout means so that the projection image is not distorted according to the three-dimensional shape of the projection surface of the screen, and output to the projector Means,
Prepared.

According to the present invention, when an original image is divided into a plurality of images, and the divided images are synthesized on a projector and projected onto a screen, the projected image is not distorted according to the three-dimensional shape of the projection surface of the screen. As described above, since each of the divided images is modified and corrected and output to the projector, the processing time and cost can be reduced when a high-definition image is projected as it is with the high-definition projector.
Further, according to the present invention, each divided image in a range where no pixel defect occurs at the boundary between the divided images synthesized on the projector is cut out from the original image, so that the original image is divided so that the projection image is not distorted. In addition, when each divided image is deformed and corrected according to the three-dimensional shape of the projection surface and synthesized on a high-definition projector, it is possible to project an image having no pixel defect at the boundary between the corrected images.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a projection image correction apparatus and a projection apparatus according to the present invention, and FIG. 2 is an explanatory view showing main images in the projection image correction apparatus and the projection apparatus of FIG.

  In FIG. 1, a huge original image 3 is distributed in parallel by the original image distribution unit 2 to N which is the number of divided inputs of the projector 1, and the same distributed images 4 a, 4 b to 4 N as the original image 3 are N-system images. The data is output to the cutout units 5a and 5b to 5N. Since the original image 3 is distributed in parallel, it is possible to cope with a change in a deformation function (to be described later) and a change in an area necessary for the deformation. The image deforming units 7a and 7b to 7N respectively cut out part of the distribution images 4a and 4b to 4N by controlling the image clipping units 5a and 5b to 5N according to the image division input specification of the projector 1. At this time, for example, as illustrated in FIGS. 2A and 2B, the image deformation units 7 a and 7 b to 7 N are cut out so that all the necessary pixels are included. The image deforming units 7a and 7b to 7N are respectively images 6a and 6b to 6N cut out by the image cutout units 5a and 5b to 5N (6a and 6b in the drawing, as shown in FIGS. 6c, 6d) is subjected to deformation correction processing in accordance with the distortion shape of the projected image to generate corrected images 8a, 8b to 8N (8a, 8b, 8c, 8d in the figure). At this time, since a region necessary for deformation is cut out and input in advance, a defect portion does not occur in the correction output. Finally, output systems of N corrected images 8a and 8b to 8N are prepared, and the projector 1 can synthesize them and project a corrected giant image corresponding to the distortion shape of the projected image. Here, a description will be given based on a configuration in which a huge original image 3 is divided and input to the projector 1, synthesized inside the projector 1, and projected onto the screen. It may be configured to distribute in parallel to N, which is the number of divided inputs of 1, perform composition correction processing according to the distortion shape of the projected image, and then combine in the previous stage of the projector 1. Further, although the original image 3 is divided in the horizontal direction in FIG. 2, the present invention can also be applied to the case where the original image 3 is divided in the vertical direction or both the horizontal / vertical directions.

Here, as a method of detecting and correcting the three-dimensional shape data of the projection plane and deforming the original image so that the projection image is not distorted, as shown in Patent Document 2, a plurality of data at equal intervals in the vertical and horizontal directions in advance are used. The marker image is input to the projector 1 and projected onto the screen, detected based on the position of the projected image of the marker, and the original image is deformed and corrected so that the positions of the projected image of the marker are equally spaced in the vertical and horizontal directions. can do. Moreover, the area | region required for a deformation | transformation can be determined with the following ideas. If the input image is Pi (x, y), the deformed image is Po (x ′, y ′), and the transformation function is T, the deformation can be described as the following relationship.
Po (x ′, y ′) = T {Pi (x, y)} (Formula 1)
If the inverse function of T is T ⁻¹ , Equation 1 can be modified as follows.
Pi (x, y) = T ⁻¹ {Po (x ′, y ′)} (Formula 2)
Usually, the deformation output (= Po (x ′, y ′)) to be sent to the projector 1 is known in the form of a rectangle or the like. Therefore, if the inverse function T ⁻¹ can be calculated, the region Pi (x, y necessary for deformation) can be calculated. ) Can be calculated.

As an example, a case where the horizontal direction is reduced will be described. The deformation formula for horizontal reduction is x ′ = ax (0 <a <1)
y '= y
Therefore, the inverse function is x = x ′ / a
y = y '
It becomes. For example, as shown in FIG. 3, if the deformation output is horizontal 100 × vertical 100 pixels and the reduction ratio a = 0.5, the necessary area has a size of horizontal 200 × vertical 100 pixels. By performing the above calculation from the given deformation specification and controlling the image cutout, a good image free from pixel defects can be obtained. Further, since the original image 3 is supplied in parallel to the image deformation units 7a and 7b to 7N as it is, it can be cut out regardless of the size of the necessary area, and free deformation is possible.

<Specific example>
As a specific example, FIG. 4 shows a configuration example in which the original image 3 having 3840 × 2400 pixels is projected after being deformed. In this example, for simplicity, the rectangular original image 3 is transformed into a parallelogram projection image 9 and its conversion function is T. The projector 1 shown here inputs four lines of 960 × 2400 pixel images obtained by dividing the original image 3 of 3840 × 2400 pixels into four in the horizontal direction, and synthesizes them internally to produce a projected image of 3840 × 2400 pixels. Projected as 9. In FIG. 4, this corresponds to A = 3840, B = 2400, and N = 4.

First, the original image distribution unit 2 distributes the 3840 × 2400 pixel original images 3 in parallel to obtain distribution images 4a, 4b, 4c, and 4d. The distribution images 4, 4b, 4c, and 4d are input to the image cutout units 5a, 5b, 5c, and 5d, respectively. The image cutout units 5a, 5b, 5c, and 5d An area necessary for the transformation is cut out, and the cut out images 6a, 6b, 6c, and 6d are sent to the image transformation units 7a, 7b, 7c, and 7d. At this time, the segmentation control signal is sent from the image transformation units 7a, 7b, 7c, and 7d, and is determined based on the inverse function T ^{−1 of the} conversion. In the example shown in FIG. 4, regions indicated by broken lines in the distribution images 4a, 4b, 4c, and 4d are regions necessary for conversion.

  The image deforming units 7a, 7b, 7c, and 7d generate 960 × 2400 pixel corrected images 8a, 8b, 8c, and 8d, which are deformed according to the distortion shape of the projected image, from the cut-out images 6a, 6b, 6c, and 6d, respectively. To do. The above deformation processing can be performed in parallel according to the number of divisions. In the present embodiment, since the transformation is a simple transformation from a rectangle to a parallelogram, each transformation process uses the same conversion function T. Finally, the deformation outputs 8a, 8b, 8c, and 8d of each divided region are projected as one huge image (projected image 9 in FIG. 4) by the projector 1. The corrected giant image projected by the above apparatus does not have a pixel defect and does not cause a decrease in the number of pixels due to superposition.

1 is a block diagram showing an embodiment of a projection image correction apparatus and a projection apparatus according to the present invention. It is explanatory drawing which shows the main image in the projection image correction apparatus and projection apparatus of FIG. It is explanatory drawing which shows an example of the cutout range. It is explanatory drawing which shows the specific example of the projection image correction apparatus which concerns on this invention, a projection apparatus, and a main image. It is explanatory drawing which shows the main image at the time of synthesize | combining and projecting a high-definition image on a screen using several low-definition projectors. It is explanatory drawing which shows the main image at the time of dividing | segmenting a high-definition image and synthesize | combining and projecting each divided image on a high-definition projector. It is explanatory drawing which shows the deformation | transformation correction process of each divided image at the time of dividing | segmenting a high-definition image and combining and dividing each divided image on a high-definition projector. It is explanatory drawing which shows the process which carried out the deformation | transformation correction | amendment of each division | segmentation image, and synthesize | combines, when dividing | segmenting a high-definition image and combining and projecting each division | segmentation image on a high-definition projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Original image distribution part 3 Original image 4a, 4b-4N Distribution image 5a, 5b-5N Image clipping part 7a, 7b-7N Image deformation part 8a, 8b-8N Correction image

Claims (2)

A projection image correction apparatus for dividing an original image into a plurality of images, synthesizing each divided image on a projector and projecting the image on a screen,
A plurality of image cutout means for cutting out each divided image in a range in which no pixel defect occurs at the boundary between the divided images synthesized on the projector, respectively, from the original image;
A plurality of image deformations that are deformed and corrected for each divided image cut out by each of the plurality of image cutout means so that the projection image is not distorted according to the three-dimensional shape of the projection surface of the screen, and output to the projector Means,
A projection image correction apparatus provided. A projector that combines a plurality of divided images divided from the original image and projects them on a screen;
A plurality of image cutout means for cutting out each divided image in a range in which no pixel defect occurs at the boundary between the divided images synthesized on the projector, respectively, from the original image;
A plurality of image deformations that are deformed and corrected for each divided image cut out by each of the plurality of image cutout means so that the projection image is not distorted according to the three-dimensional shape of the projection surface of the screen, and output to the projector Means,
A projection apparatus provided.

Images