CN1854881A - System and method for aligning sub-images projected on a screen - Google Patents

Abstract

The invention provides a projection system which is used for projecting an image to N areas of a screen, wherein N is an integer larger than 1. The projection system according to a preferred embodiment of the present invention includes a processing device, N projection devices, and at least one sensing device. The processing device is used for dividing the image into N sub-images. The N projection devices are used for respectively receiving the N sub-images and projecting the N sub-images to N areas on the screen. The at least one sensing device is used for sensing the projected sub-images and transmitting the N sub-images sensed by the sensing device to the processing device. The processing device further calculates a plurality of corrected difference values among the sensed N sub-images, and adjusts the N sub-images projected onto the screen according to the plurality of corrected difference values to eliminate the corrected difference values.

Description

System and method for aligning sub-images projected on a screen

technical field

The present invention relates to a projection system, in particular to a projection system for projecting an image onto a screen divided into N regions.

Background technique

With the advancement of optical technology and projection technology, as well as the impact of the downward trend of market prices, projectors with high resolution and large screens have become the best choice for corporate presentations, conferences, education and training, and even home entertainment. An integral part of the visual image. Therefore, the high image quality, high brightness, compact size, reasonable price and after-sales service requirements of projectors have become important indicators for consumers when purchasing.

A single projector currently on the market can project an image with a maximum size of about 200 inches. Under the current pursuit of high quality of life, the size of the projection screen that the projector can project in the past no longer meets the needs of some occasions. As the demand for large-scale projection is gradually increasing, the projection screen even needs to reach several meters to meet the needs of consumers for projection screens. However, such a large-scale projected picture cannot be achieved by a single projector, but several projectors must respectively project sub-images on the screen, and then combine the projected sub-images to form a complete image. Therefore, there must be a problem of connecting and combining multiple sub-images, which also affects the quality of the image projected by the entire projection system.

Therefore, an object of the present invention is to provide a projection system to overcome the above-mentioned problems.

Contents of the invention

An object of the present invention is to provide a projection system for projecting a plurality of sub-images onto a screen divided into N regions, and adjusting the plurality of sub-images projected on the screen to eliminate correction differences between the sub-images .

According to a first preferred embodiment of the present invention, the projection system is provided for projecting an image onto a screen divided into N areas, wherein N is an integer greater than 1. The projection system includes a processing device, N projection devices and at least one sensing device. The processing device is used for dividing the image into N sub-images. The N projection devices are used to respectively receive the N sub-images and project the N sub-images onto N areas of the screen. The at least one sensing device is used for sensing the projected N sub-images, and sending the sensed N sub-images to the processing device. The processing device further calculates a plurality of correction difference values between the sensed N sub-images, and adjusts the N sub-images projected on the screen according to the plurality of correction difference values to eliminate the plurality of correction difference values .

A projection system according to a second preferred embodiment of the present invention is provided for transmitting a first sub-image to a first projection device, and transmitting a second sub-image to a second projection device. The first projection device and the second projection device project the first sub-image and the second sub-image onto a screen to form a first projected sub-image and a second projected sub-image. The projection system includes a sensing device and a processing device. The sensing device is used for sensing the first projected sub-image and the second projected sub-image to form a first sensing sub-image and a second sensing sub-image. The processing device is used for receiving an original image, and dividing the original image into the first sub-image and the second sub-image. The processing device receives the first sensed sub-image and the second sensed sub-image from the sensing device, and calculates a corrected difference value between the first sensed sub-image and the second sensed sub-image . The processing device adjusts the first projected sub-image and the second projected sub-image according to the corrected difference to eliminate the corrected difference.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a projection system 10 according to a first preferred embodiment of the present invention.

FIG. 2A to FIG. 2D show several examples of the types and extraction methods of the calibration difference.

FIG. 3 shows an example of the sub-images mixed with an edge-marked image.

FIG. 4 is a flow chart of the steps of the projection method according to the present invention.

FIG. 5 is a schematic diagram of a projection system 50 according to a second preferred embodiment of the present invention.

Symbol Description

10, 50: projection system 12, 20, 30, 56: screen

13, 22, 24, 32, 34, 36, 38: Area

131, 132: mesh 14, 60: processing system

16, 52, 54: projection device 18, 58: sensing device

S40～S48: process steps

Detailed ways

Please refer to FIG. 1 , which is a schematic diagram of a projection system 10 according to a first preferred embodiment of the present invention. The projection system 10 is used for projecting an image onto a screen 12 divided into N areas 13 , where N is an integer greater than 1.

As shown in FIG. 1 , the projection system 10 includes a processing apparatus (Processing apparatus) 14 , N projection apparatus (Projecting apparatus) 16 and at least one sensing apparatus (Sensingdevice) 18 . In the example of FIG. 1 , N is equal to 2, that is, the screen 12 is divided into two areas 13 , and the processing device 14 includes two projection devices 16 . Also in the example shown in Figure 1, only one sensing device 18 is shown in order to illustrate a first preferred embodiment of the invention.

The processing device 14 is used for dividing an input image into N sub-images. Each sub-image corresponds to an area 13 . In order to cooperate with the example where N is equal to 2, the following will illustrate that the input image is divided into two sub-images.

The two projection devices 16 are used to respectively receive the above two sub-images, and project the received sub-images onto the corresponding areas 13 of the screen 12 .

The sensing device 18 is used to sense the sub-image projected on the screen 12 and transmit the sensed sub-image to the processing device 14 .

The processing device 14 further calculates an alignment difference (Alignment difference) between the two sub-images. The processing device 14 adjusts the two sub-images projected on the screen 12 according to the plurality of correction difference values to eliminate the plurality of correction difference values. In a specific embodiment, the corrected difference values may be relative position differences between sub-images, size ratios between sub-images, or brightness differences.

In addition, the processing device 14 selects any projection device 16 to adjust the position, size, keystone distortion or brightness of the sub-images projected on the screen 12, by adjusting the position, size, keystone distortion or brightness of the sub-images , the plurality of correction difference values can be eliminated, and then the effect of image adjustment can be achieved.

Regarding the types, acquisition methods and elimination methods of the correction difference values, several examples are given below to illustrate in detail, and please refer to FIG. 2A to FIG. 2D and the detailed description of related drawings. 2A to 2D show that two sub-images are respectively projected on two areas (22, 24) of a screen 20 by means of a projection system (not shown in the figure) according to a first preferred embodiment of the present invention. schematic diagram. The sub-images shown in FIG. 2A are expected to be projected on the area 22 and the area 24 respectively, so that there is no corrected difference between them, and then a complete and enlarged image is formed. FIG. 2B to FIG. 2D respectively show the sub-images projected on the area 22 and the area 24 respectively, and there are different types of correction difference values among them.

As shown in FIG. 2B , the size of the sub-image projected onto the area 22 is smaller than the intended enlarged size, and its projected position deviates from the intended projected position. Therefore, the projection system according to the first preferred embodiment of the present invention will extract a corrected difference value d3=d2/d1 for the size ratio between the sub-images, and then adjust the projection onto the area 22 according to the corrected difference value d3 sub image. The size-adjusted sub-image projected onto the area 22 is shown in FIG. 2C . However, as shown in FIG. 2C , there is still a vertical distance d4 and a horizontal distance d5 between the sub-images respectively projected on the area 22 and the area 24 . Therefore, the projection system according to the first preferred embodiment of the present invention will capture two corrected difference values d4 and d5 with respect to the position of the sub-image, and then adjust the projection to the area according to these corrected difference values (d4 and d5) 22, and then complete the sub-image in which the correction difference value has been eliminated as shown in FIG. 2A.

In addition, as shown in FIG. 2D , two sub-images projected on the two areas 22 and 24 of the screen 20 respectively have individual luminances d6 and d7 . Therefore, the projection system according to the first preferred embodiment of the present invention will retrieve a corrected difference value d8=(d7-d6) for the brightness difference between the sub-images, and then adjust the projection to the area according to the corrected difference value d8 22 sub-images to remove corrected difference values between sub-images.

In a specific embodiment, also shown in FIG. 1, the processing device 14 can further mix an alignment image (Alignment image) in each of the two sub-images, and output the mixed sub-images respectively to two projection devices 16 . The corrected image and the sub-images are projected onto the screen via the projection devices 16 . The corrected image projected on the screen is also sensed by the sensing device 18 along with the sub-images, and then sent to the processing device 14 . With the sensed calibration image, it is easier and more accurate for the processing device 14 to obtain the calibration difference value. For example, the size of the adjacent meshes (Mesh) 131 and 132 shown in FIG. 1 can be used to adjust the correct shape of the sub-image, and the alignment of the adjacent meshes can also make the two sub-images more closely connected. In the example shown in FIG. 1 , the corrected image is a mesh image, and the size of the mesh image is the same as that of the two sub-images.

In another embodiment, the corrected image mixed into each sub-image is an edge mark image, as shown in FIG. 3 . Fig. 3 shows that four sub-images are respectively projected on four areas (32, 34, 36 and 38) of a screen 30 by means of a projection system (not shown in the figure) according to a first preferred embodiment of the present invention. ) on the schematic diagram. The so-called edge marking image is to mix at least one edge of the four sub-images into the marking image, for example, as shown in FIG. Images (F, J, H), (E, L, G), (B, D, I) and (A, C, K).

The correction of the sub-images to be projected by the projection system according to the first preferred embodiment of the present invention can be used for the initial correction before the official projection of the image, and the official projection of the image starts after the projection position is determined after the correction. If it is necessary to correct the projected sub-image while projecting, the corrected image used by the projection system according to the present invention can be projected by an invisible ray. Since the user cannot see the corrected image projected by the invisible light when viewing the image on the screen 12 , the content of the image seen by the user and the quality of the projected image will not be affected.

In a specific embodiment, the sensing device and the processing device can be arranged in a single projection device, that is to say, the sensing device 18 and the processing device 14 shown in FIG. 1 are combined with a single projection device 16 are designed into the same airframe. In this specific embodiment, the sensing device can sense two projected sub-images through the lens of the projection device, and then transmit the sensed sub-images to the processing device for subsequent adjustment of the projected image. In this specific embodiment, a communication and image adjustment master-slave control mechanism must be established among the projection devices. In another specific embodiment, the sensing device and the processing device can also be set separately and connected to the independent projection devices. In this example, the sensing device directly senses the images projected by the two projection devices 16 on the screen, and transmits the images to the processing device. Both of the above two specific methods can achieve the effect of sensing multiple sub-images projected on the screen, and sending the sensed multiple sub-images to the processing device for subsequent adjustment actions.

In one embodiment, the blending of the rectified image and the sub-image is performed in the projection device 16 . In another embodiment, the blending of the rectified image and the sub-image is processed in the processing device 14 .

In a specific embodiment, the projecting device 16 adjusts the projected sub-image according to a plurality of instructions of the processing device 14 . In this specific embodiment, after the processing device 14 calculates a plurality of correction difference values, the projection device 14 automatically adjusts the sub-images projected by each projection device. By adjusting the projected sub-images, the correction difference between the sub-images can be eliminated.

In another embodiment, the processing device 14 adjusts two sub-images, and transmits the adjusted two sub-images to two projection devices 16 . In this specific embodiment, after the processing device 14 calculates a plurality of correction difference values, the processing device 14 firstly adjusts the two sub-images by itself, and then transmits the two sub-images adjusted according to the plurality of correction difference values to the two The projection device 16 performs projection. In this specific embodiment, through the two projection devices 16 , the sub-images projected onto the screen 12 again form a complete image after eliminating multiple correction differences.

Please refer to FIG. 4 . FIG. 4 is a flow chart of the steps of the projection method according to the present invention. As shown in FIG. 4 , the present invention provides a projection method for projecting an image onto a screen divided into N areas, where N is an integer greater than 1. According to the projection method of the present invention, step S40 is first performed to divide the image into N sub-images. Then step S42 is executed to project the N sub-images onto N areas of the screen respectively.

Then execute S44, and in step S44, the projected N sub-images are sensed. Step S46 is then executed: a plurality of corrected difference values between the sensed N sub-images are calculated. Finally, step S48 is executed, and the N sub-images projected on the screen are adjusted according to a plurality of correction difference values, so as to eliminate the plurality of correction difference values.

In one embodiment, in step S40, a corrected image is mixed into each sub-image. In one embodiment, the corrected image is projected using an invisible light.

In a specific embodiment, in step S48, the position, size, keystone distortion or brightness of the N sub-images projected on the screen are selectively adjusted.

Please refer to FIG. 5 , which is a schematic diagram of a projection system 50 according to a second preferred embodiment of the present invention. The projection system 50 is provided for transmitting a first sub-image to a first projection device 52 and a second sub-image to a second projection device 54 . The first projection device 52 and the second projection device 54 respectively project the first sub-image and the second sub-image onto a screen 56 to form a first projected sub-image and a second projected sub-image.

As shown in FIG. 5 , the projection system 50 includes a sensing device 58 and a processing device 60 .

The sensing device 58 is used for sensing the first projected sub-image and the second projected sub-image projected on the screen 56 to form a first sensing sub-image and a second sensing sub-image.

The processing device 60 is used for receiving an original image, and dividing the original image into the first sub-image and the second sub-image. The processing device 60 receives the sensed first sensing sub-image and the second sensing sub-image from the sensing device 58, and calculates a ratio between the first sensing sub-image and the second sensing sub-image. Corrected variance values. The processing device 60 adjusts the first projected sub-image and the second projected sub-image according to the corrected difference to eliminate the corrected difference.

In a specific embodiment, the processing device 60 also mixes a corrected image into the first sub-image and the second sub-image, and transmits the first sub-image mixed with the corrected image to the first projection device 52, and transmits The second sub-image of the corrected image is mixed to the second projection device 54 .

In a specific embodiment, the corrected image is a grid image, and the size of the grid image is the same as that of the first sub-image and the second sub-image. In another embodiment, the corrected image is an edge-marked image, and the edge-marked image blends at least one edge of the first sub-image and the second sub-image into the edge-marked image respectively. In one embodiment, the corrected image is projected using an invisible light.

In a specific embodiment, the first projection device 52 also mixes a corrected image into the first sub-image, and projects the first sub-image mixed with the corrected image. The second projection device 54 mixes the corrected image into the second sub-image, and projects the second sub-image mixed with the corrected image.

In one embodiment, the processing device 60 also selectively adjusts the position, size, keystone distortion or brightness of the first sub-image and the second sub-image projected on the screen 56 .

In a specific embodiment, the first projecting device 52 and the second projecting device 54 respectively adjust the first projected sub-image and the second projected sub-image according to a plurality of instructions issued by the processing device 60 . In another specific embodiment, the processing device 60 adjusts the first sub-image and the second sub-image, and transmits the adjusted first sub-image to the first projection device 52, and transmits the adjusted second sub-image The image is sent to the second projection device 54 .

If the above corrected image is projected onto the screen using invisible light, since the invisible light will not affect the image when the user watches normally, the corrected image only needs to be designed as a simple pattern to achieve the purpose of providing the corrected image. Therefore, the projection system according to the present invention can correctly sense the corrected image projected on the screen and then calculate the corrected difference value only by using a sensing device with a relatively low resolution. If the corrected image is designed as a simple pattern, the calculation of the corrected difference value will be relatively simple, so that the calculation speed can be accelerated and the time for calculation and processing can be saved. Therefore, according to the projection system of the present invention, the effect of accurately adjusting the sub-image can be achieved without using a high-resolution image sensor and a high-performance processor, which not only saves cost, but also saves time for calculation and processing.

By means of the above detailed description of the preferred embodiments, it is hoped that the features and spirit of the present invention can be described more clearly, and the scope of the present invention is not limited by the preferred embodiments disclosed above. On the contrary, the intention is to cover various modifications and equivalent arrangements within the scope of the invention.

Claims (22)

1. optical projection system, this optical projection system be in order on N the zone of throwing image to a screen, and wherein N is one greater than 1 integer, and this optical projection system comprises:

One treating apparatus, this treating apparatus is a N sub-image in order to cut apart this image;

N grenade instrumentation, this N grenade instrumentation is in order to receive this N sub-image respectively, each sub-image system in these sub-images to should N a zone in the zone, each grenade instrumentation is projected to this sub-image that receives on the zone of this correspondence on this screen; And

At least one sensing apparatus, this N sub-image that this at least one sensing apparatus is throwed in order to sensing, and this N sub-image of transmission institute sensing is to this treating apparatus;

Wherein this treating apparatus further calculates a plurality of correction difference value between this sensed N sub-image, and according to these a plurality of correction difference value, adjusts this N sub-image that is projected on this screen, to eliminate these a plurality of correction difference value.

2. optical projection system according to claim 1, wherein this treating apparatus further all mixes a correcting image in each sub-image in this N sub-image, and exports the sub-image of this N after mixed to this N grenade instrumentation.

3. optical projection system according to claim 2, wherein this correcting image is a grid image, the size system of this grid image is big or small identical with this N sub-image.

4. optical projection system according to claim 2, wherein this correcting image is an edge tag images, this edge labelling image is that at least one edge in this N sub-image is mixed to this edge labelling image.

5. optical projection system according to claim 1, wherein each grenade instrumentation is mixed in a correcting image in this N sub-image in this N grenade instrumentation, and throws this N sub-image after mixed.

6. optical projection system according to claim 5, wherein this correcting image utilizes an invisible light to throw.

7. optical projection system according to claim 1, wherein this treating apparatus is optionally adjusted position, size, trapezoidal distortion or the brightness of this N sub-image that is projeced on this screen.

8. optical projection system according to claim 7, wherein this N grenade instrumentation according to a plurality of instructions of this treating apparatus to adjust this N sub-image that is throwed.

9. optical projection system according to claim 7, wherein this treating apparatus is adjusted this N sub-image and is transmitted this controlled this N sub-image to this N grenade instrumentation.

10. projecting method, this projecting method system is in order on N the zone of throwing image to a screen, and wherein N is one greater than 1 integer, and this projecting method comprises the following steps:

(a) cutting apart this image is N sub-image;

(b) throw this N sub-image respectively to this N zone of this screen;

(c) this N sub-image of being throwed of sensing;

(d) calculate a plurality of correction difference value between sensed this N sub-image; And

(e), adjust this N sub-image that is projected on this screen, to eliminate these a plurality of correction difference value according to these a plurality of correction difference value.

11. projecting method according to claim 10 wherein further comprises the following steps: in the step (a)

(a1) mix a correcting image each sub-image to this N sub-image.

12. projecting method according to claim 11, wherein this correcting image is to utilize an invisible light to throw.

13. projecting method according to claim 10 wherein further comprises the following steps: in the step (e)

(e1) optionally adjust position, size, trapezoidal distortion or the brightness that is projeced into this N sub-image on this screen.

14. optical projection system, this optical projection system system is in order to transmit one first sub-image to, first grenade instrumentation and one second sub-image to, second grenade instrumentation, this first grenade instrumentation and this second grenade instrumentation system throw this first sub-image respectively and this second sub-image becomes one first projection sub-image and one second projection sub-image on a screen, and this optical projection system comprises:

One sensing apparatus, this sensing apparatus becomes one first sensing sub-image and one second sensing sub-image in order to this first projection sub-image of sensing and this second projection sub-image; And

One treating apparatus, this treating apparatus is in order to receive a raw video, and cutting apart this raw video is this first sub-image and this second sub-image, this treating apparatus receives this first sensing sub-image and this second sensing sub-image from this sensing apparatus, to calculate this first sensing sub-image and this second a sensing sub-image correction difference value between the two, and proofread and correct difference value according to this, adjust this first projection sub-image and this second projection sub-image, to eliminate this correction difference value.

15. optical projection system according to claim 14, wherein this treating apparatus is mixed to a correcting image in this first sub-image and this second sub-image, and this first sub-image that transmits this correcting image of mixing is to this first grenade instrumentation, and this second sub-image that transmits this correcting image of mixing is to this second grenade instrumentation.

16. optical projection system according to claim 15, wherein this correcting image is a grid image, the size of this grid image and this first sub-image and this second sub-image measure-alike.

17. optical projection system according to claim 15, wherein this correcting image is an edge tag images, and this edge labelling image system is mixed to this edge labelling image with at least one edge in this first sub-image and this second sub-image respectively.

18. optical projection system according to claim 14, wherein this first grenade instrumentation is mixed in a correcting image in this first sub-image, and throw this mixed first sub-image, this second grenade instrumentation system is mixed in this correcting image in this second sub-image, and throws this mixed second sub-image.

19. optical projection system according to claim 18, wherein this correcting image utilizes an invisible light to throw.

20. optical projection system according to claim 14, wherein this treating apparatus system optionally adjusts this first sub-image that is projeced on this screen and position, size, trapezoidal distortion or the brightness of this second sub-image respectively.

21. optical projection system according to claim 20, wherein this first grenade instrumentation and this second grenade instrumentation system adjusts this first projection sub-image and this second projection sub-image respectively according to a plurality of instructions of this treating apparatus.

22. optical projection system according to claim 20, wherein this treating apparatus system adjusts this first sub-image and transmits this controlled this first sub-image to this first grenade instrumentation, and this treating apparatus is also adjusted this second sub-image and transmitted this controlled this second sub-image to this second grenade instrumentation.

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