JPH11288041A - Method and device for erasing joint of video in combination of plural projectors - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the quality of a combined video by adjusting the clearness of peripheral sections according to the advancing depth of a light shielding piece provided in front of the projection lens of a projector into a projection lens and erasing a joint of the combined video. SOLUTION: An interdigital light shielding cover 500 is attached in front of the projection lens of each projector, the clearness of the overlapping sections of a combined video is examined, and the light shielding piece 40 of the cover 500 is advanced in the lens direction by the required number and depth, so that it intercepts a projected light beam. Thus, the clearness of the peripheral light of each projector is attenuated to be the same as the total of the clearness of the overlapped peripheral light beams, that is, the clearness of a video section other than the overlapping section, whereby a joint of the video is erased, thus the entire video projected on a circular-arc shaped screen is made uniform and continuous so as to increase the uniformity of the entire video. A shortcoming such as mismatching of video caused by joint or the difference in the clearness is eliminated and the video of the entire screen is integrated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for improving the image quality of a projector, and more particularly, to a method and an apparatus for eliminating a seam of a combined image of a plurality of projectors. Provided in front of the projection lens of each projector, adjust the brightness of the marginal area of the light beam projected by the projection lens according to the depth of penetration of the light shielding piece provided in each comb-shaped light shielding cover device into the projection lens and combine them The present invention relates to a method and an apparatus for improving the quality of a combined image by eliminating joints of the combined image by making the brightness of the overlap region of the image the same as that of the main image region.

[0002]

2. Description of the Related Art A well-known combination image method of a plurality of projectors and its disadvantages will be described below.

A projector has red, blue, and green projection lenses, and the projection screen of a single known projector has a maximum of 200 inches. For this reason, in order to meet the demand for modern large-area projection of several meters, several tens of meters, or multiple layers of a building, several or several tens of projectors are arranged side by side and vertically. Then, a method is used in which images projected by individual projectors are combined to form one required image. For this reason, a joint processing problem occurs when a plurality of images are connected and combined, and whether or not the processing is performed has a great effect on the overall image quality.

[0004] A well-known combination video method of a plurality of projectors and a seam processing method thereof are as shown in FIGS. That is, three projectors 10, 11,
Taking the example of using 12 as an example, the projection lens 3 of each projector projects onto each assigned area of the screen 1 and the images are combined to form one combined image. Has three main image areas 100, 110, and 120 and an overlap area 10
1 and 111 are formed, and the brightness of the main video section is lower than the brightness of the overlap sections 101 and 111. For this reason,
A seam line is generated in the image, that is, since the brightness of the overlap section is clearly different from that of the main image section, there is a disadvantage that the brightness is nonuniform as a whole image. In the prior art, to solve this problem, the brightness of each seam is checked by adjusting the electric circuit of the projector and the electronic action of the seam elimination signal processor to make the brightness of the overlap area of each image linear. The brightness is attenuated, and the brightness of the overlap section of the combination image and the brightness of the main image section are made to match, so that the seam line cannot be recognized. However, such electronic adjustment requires adjustment of an electric circuit by an expert, and since the response of the brightness after adjustment does not match for each projector, the effect is not so much obtained, and the seam is still intact. There was a problem that the brightness of the combined image was not uniform.

[0005] For this reason, projectors have been manufactured in which the projection effect is increased by combining extremely complicated electric circuits based on more advanced technology, expensive electronic components, and further complicated computer calculations. Was not. In addition, projectors that combine these advanced technologies with expensive components have achieved improved combined image quality, but only when projected on a flat screen, and have a circular arc screen and image brightness. It is not effective when displaying an image with a large difference (for example, an image in which the brightness of the sky is high and the brightness of the ground is low). The arc-shaped screen has a problem of a linear drop, and even if the light luminosity of the projection lens is adjusted, if it is projected on an arc-shaped surface, there is a problem that connection is impossible. When displaying an image with uneven brightness (such as when the sky and the ground are present in the image at the same time), if the seam overlaps with the image in the low brightness area, the actual display will be less than the standard brightness on both screens. If the images in the high brightness area overlap, the actual display will be higher than the brightness of the screens on both sides. As a result, the image of the seam is clearly non-uniform. For this reason, gamma (GA) by computer software has conventionally been used for projectors.
MMA) value adjustment is used to adjust the brightness distribution of the output video signal using the gamma value. Among them,
The red, blue, and green (RGB) primaries are each divided into 16 segments, and the adjustable parameter range of each segment of the three primaries is divided into floors 0 to 1023, so that the adjustable parameter change of the three channels is 3 ×. 3x1
6 × 1024 = 147456 types, and it took a lot of time to adjust the seam to an allowable range. In addition, since the brightness of the conventional projector decreases as the period of use becomes longer, it is necessary to adjust the parameters as needed. Therefore, there are too many problems for actual use, and this cannot be generally performed.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and an apparatus for eliminating a seam of a combined image of a plurality of projectors in order to solve the above-mentioned disadvantages of the prior art. Adjustment of the image projected on the large screen can be performed at low cost regardless of the screen area or the expert knowledge of the adjuster,
To meet the need for projection on large flat screens or arcuate screens in propagation media, entertainment, defense, ship management, ship, aircraft simulation, etc., to prevent the problem of poor quality of combined images. It is an issue.

[0007]

According to a first aspect of the present invention, there is provided a type of combined image projection apparatus in which a plurality of projectors combine images projected onto a screen to form a combined image. A comb-shaped light-shielding cover 500 is attached in front of the camera, the brightness of the overlap section of the combined image is checked, and the light-shielding pieces 40 of the comb-shaped light-shielding cover 500 are made to enter the lens direction with a necessary number and depth as required, and the projected light is shielded from the light. By blocking with the piece 40, the edge light brightness of each projector is attenuated, and the total brightness of the overlapping edge light beams, that is, the brightness of the overlap section is made the same as the brightness of the image section other than the overlap section, Eliminate seams in the image, make the whole image projected on the arc screen uniform and continuous, and increase the uniformity of the whole image Wherein, it is a joint method of erasing a combination image of a plurality of projectors.

According to a second aspect of the present invention, there is provided a kind of combined video projector in which each of a plurality of projectors combines images projected on a screen to form a combined video, wherein a comb-shaped projector is provided in front of each projection lens of each projector. The light-shielding cover 500 is attached, and the comb-shaped light-shielding cover 500 is attached to the frame 50 and a plurality of light-shielding pieces 40 having a thin shape.
Are formed on both sides of the frame body 50 so as to form a housing groove penetrating in the horizontal direction, and a light-shielding piece 40 is provided with a conical surface 42 at one end thereof. , And slides forward and backward freely, and the brightness of the overlap section of the combined image is adjusted by the penetration depth of each light shielding piece 40 into the frame 50. A joint image erasing device for a combined image of a plurality of projectors.

According to a third aspect of the present invention, a track groove is provided on the groove wall of the housing groove of the frame body, and sliding grooves corresponding to the track groove are provided on both sides of the light shielding piece. The joint of a plurality of projectors according to claim 2, wherein the sliding groove (41) is slidably fitted to the track convex edge (52), and the light shielding piece (40) is movable forward and backward with respect to the inside of the frame (50). It is an erasing device.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention utilizes the principle of light diffraction, that is, a comb-shaped light-shielding cover whose light-shielding degree can be adjusted is designed, placed in front of a lens of the projector, and applied to the light projected by the projector. Pass through the light-shielding cover, attenuate the brightness with the blocked area, that is, in the light rays projected by each projector, attenuate the edge light brightness,
Thereby, the luminosity of the overlap section formed by overlapping of the marginal lights in the combined image is made the same as the luminosity of the main image section, thereby forming the seam line formed by the luminosity difference between the overlap section and the main image section. By eliminating the image, the image projected on the entire flat or arc screen is made to be evenly continuous, thereby increasing the sense of reality and realism of the image. In addition, the brightness adjustment operation of the present invention is extremely simple and easy to operate, so that the operation can be performed quickly, and therefore, the present invention has high utility.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS For a brief description of the technical means of the present invention, reference is first made to FIGS. In the present invention, a comb-shaped light-shielding cover is provided in front of the projection lens of each projector, projected from the projection lens to the screen via the light-shielding cover, and the brightness of the overlap area of the combined image is checked. By adjusting the penetration depth of the light-shielding thin section of the lens into the lens,
The edge light brightness is adjusted so that the total brightness of the edge light, that is, the brightness of the overlap area formed by overlapping the edge light is the same as the other light areas, and the brightness of the seam is completely changed to the other light areas. In the same manner as described above, overlapping sections having different brightness are not generated, and thereby the joints are eliminated from the combined video.

The comb-shaped light shielding cover 500 of the present invention will be described below. Please refer to FIGS. In the projector 20 of the present invention, the red, blue and green projection lenses 3
In front of each projection lens, there is provided a comb-shaped light-shielding cover 500, which is composed of a frame 50 and a plurality of light-shielding pieces 40. A groove 52 penetrating the light-shielding piece 4 is provided on the inner wall before and after the groove 51.
Numeral 0 is a flaky shape, a slide groove 41 corresponding to the orbital convex edge 52 of the frame body 50 is provided on the side, and a pointed cone surface 42 is formed at one end. , And by the combination of the track convex edge 52 and the sliding groove 41,
Each light shielding piece 40 is moved in or out as necessary,
The depth of entry into the lens is adjustable.

The operation and effect of the brightness adjustment using the light shielding piece 40 of the present invention will be further described below. Please refer to FIGS. The rays emitted from one light source include a principal ray H and a marginal ray H1, and the adjustment of the light source brightness required for projection is an adjustment to make the brightness of the marginal ray H1 necessary. As shown in FIG. 8, the solution used in the present invention is to adjust the edge light brightness as required, and it is a stepwise adjustment, ie, one need to adjust the image brightness. Two or more light-shielding pieces 4
By adjusting the depth of penetration into the lens of 0, a diffraction effect is generated when the light beam passes through the conical surface 42 of the light shielding piece 40, and the brightness value is attenuated.
The conical surface 42 of the shading strip 40 of the present invention constitutes a comb-shaped fence and is used to attenuate the edge luminosity value, which provides the same effect as attenuating luminosity through a net. I do. According to the present invention, the brightness of an image can be adjusted by checking where the brightness of the image is, and adjusting the degree of entry of the light shielding piece 40 corresponding to that part, that is, the degree of light shielding,
The effect of eliminating the seam of the combination image can be achieved.

Hereinafter, the overall control and effect of the present invention will be described in more detail. Please refer to FIGS.
When the images of the three projectors 20, 21, and 22 are combined, three main image sections 200, 210, and 220 and two overlap sections 211 and 212 are included in the combined image. By adjusting the right light shielding piece of each of the projection lenses 30, 31, 32 of the left and right projectors 20, 22 and the light shielding pieces on both sides of each of the projection lenses of the central projector 21, the brightness of the overlap sections 211, 212 can be increased. Each of the main video sections 200, 210, and 220 is equal. That is, assuming that the luminosity of the main video area is 100%, the edge light luminosity projected by the two projectors is 50%, respectively, and becomes 100% after overlapping, which is the same as the luminosity of the main video area. Also, in the present invention, at the time of edge light brightness adjustment,
Since the light-shielding pieces 40 can be adjusted by moving them one by one, a kind of extremely multi-stage adjustment can be performed.
Since 0 is a small area, a small area can be adjusted. In particular, projection onto an arc-shaped screen can be dealt with by fine adjustment of the change in non-linearity. You can grasp it exactly. In the above description, the overlap section is synonymous with the seam or the seam line, but the seam or the seam line is used in an expression that emphasizes the visual sense, and for convenience of explanation, it is used as necessary each time. .

[0015]

According to the present invention, a method and an apparatus for eliminating a seam of a combined image of a plurality of projectors solve the drawbacks of an image irregularity due to a seam and a drop in luminosity which have conventionally occurred when combining images of a plurality of projectors.
The images on all screens can be integrated, and the operation is easy and quick, and the cost of the device is low and has excellent practical value.

[Brief description of the drawings]

FIG. 1 is a block diagram of a conventional joint processing method.

FIG. 2 is a conventional combined image state display diagram of a plurality of projectors, in which A indicates a projection state, and B is a screen projection section display diagram.

FIG. 3 is a method block diagram of the present invention.

FIG. 4 is a view showing a combination image state of a plurality of projectors according to the present invention, wherein A indicates a projection state, and B indicates a projection state;
Is a screen projection section display diagram.

FIG. 5 is a combined perspective view of the projector according to the invention.

FIG. 6 is an exploded perspective view of the projection lens of the present invention and a comb-shaped light shielding cover combined with the projection lens.

FIG. 7 is a front view showing an adjustment operation display of the projection lens of the present invention and the comb-shaped light shielding cover combined therewith.

FIG. 8 is a luminosity adjustment area display diagram of the present invention.

[Explanation of symbols]

 10, 11, 12, 20, 21, 22 Projector 100, 110, 120, 200, 220 Main image area 101, 111, 211, 212 Overlap area 3, 30, 31, 32 Projection lens 40 Shielding piece 41 Sliding groove 42 Conical surface 50 Frame 500 Comb-shaped light shielding cover 51 Housing groove 52 Orbital convex edge L Joint line H Chief ray H1 Edge ray

Claims (3)

[Claims] 1. A combo-shaped light-shielding cover 500 is mounted in front of each projection lens of each projector in a kind of a combination video projection device in which a plurality of projectors combine images projected onto a screen to form a combined image. The luminosity of the overlap area of the image is checked, and the light-shielding pieces 40 of the comb-shaped light-shielding cover 500 are made to enter the lens direction with the required number and depth as necessary, and the projected light is transmitted to the light-shielding pieces 4
By blocking at 0, the edge light brightness of each projector is attenuated, and the sum of the brightness of the overlapping edge rays, that is, the brightness of the overlap section is made the same as the brightness of the image section other than the overlap section, and the image is displayed. Elimination of joints of multiple projectors characterized by eliminating the seams of the images, making the whole of the image projected on the arc-shaped screen uniform and continuous, and increasing the uniformity of the whole image. Method. 2. A combined video projector in which a plurality of projectors combine video projected on a screen to form a combined video, wherein a comb-shaped light shielding cover 500 is attached in front of each projection lens of each projector. The comb-shaped light-shielding cover 500 is composed of the frame 50 and a plurality of light-shielding pieces 40 having a flaky shape, and receiving grooves are formed on both sides of the frame 50 so as to penetrate horizontally.
A pointed cone surface 42 is provided at one end of the light shielding piece 40,
Is inserted horizontally into the frame 50 so that it can slide forward and backward, and the brightness of the overlap section of the combined image is adjusted by the penetration depth of each light-shielding piece 40 into the frame 50. A joint image elimination device for a combination image of a plurality of projectors having the above configuration. 3. A track projection edge 52 is provided on the groove wall of the housing groove 51 of the frame body 50, and the track projection edge 52 is provided on both sides of the light shielding piece 40.
And the sliding groove 41 corresponding to the
3. The apparatus according to claim 2, wherein the light-shielding piece is slidably fitted to the frame and the light-blocking piece is movable back and forth with respect to the inside of the frame.