TWI818282B - Projector device, projector system and method for calibrating projected image - Google Patents

Abstract

A projector device, a projector system and a method for calibrating the projected image are provided. The projector device and an external projector device receive the same image source and respectively project one image and another image corresponding to the image source, wherein the same portion where the two images overlap the image source forms an overlapping area. The projector device includes a lens, a shading element and a processor. The shading element is disposed on the lens. The processor controls the shading element to selectively shade a local area of the lens according to the brightness of the image source, and the local area corresponds to the overlapping area.

Description

Projection device, projection system and projection image correction method

The present invention relates to a device, a system and an image correction method, and in particular, to a projection device, a projection system and a projection image correction method.

With the advancement of display technology, some projection technologies have been developed for displaying large-scale images, such as large advertising billboards, interactive experience areas in exhibition venues, etc. This kind of projection technology can be realized by more than two projection devices. Each projection device projects its own image, and these images can be spliced into a complete picture.

When splicing images, each image will partially overlap with adjacent images to form a fusion area to avoid gaps between images and make the projected image visually smoother and smoother. However, the current technology still has some problems in this fusion area that have not been paid attention to and solved, resulting in the defect of uneven brightness of the picture when projecting certain scenes.

The present invention relates to a projection device, a projection system and a projection image correction method. By arranging a light-shielding component on a lens of one of the projection devices, the light-shielding component is ordered to block a local area of the lens in order to block the projection to the superimposed area. light to improve the problem of excessive brightness in the overlapping area in some cases.

According to one aspect of the present invention, a projection system is provided. The projection system includes a first projection device and a second projection device. The first projection device includes a lens and a light-shielding component, and the light-shielding component is arranged on the lens. The first projection device and the second projection device receive the same image source and respectively project the first image and the second image corresponding to the image source. The first image and the second image overlap the same part of the image source to form an overlapping area. The first projection device controls the light shielding component to selectively shield a local area of the lens according to the brightness of the image source, and the local area corresponds to the overlay area.

According to another aspect of the present invention, a projection image correction method is proposed, which is suitable for the first projection device and the second projection device. This method includes the following steps. First, the first projection device and the second projection device receive the same image source and respectively project the first image and the second image corresponding to the image source. Then, the first projection device and the second projection device are adjusted so that the first image and the second image overlap the same portion of the image source to form an overlapping area. Then, the light-shielding component located on the first projection device is controlled according to the brightness of the image source, so that the light-shielding component selectively blocks a local area of the lens of the first projection device, and this local area corresponds to the overlapping area.

According to yet another aspect of the present invention, a projection device is provided. The projection device and an external projection device receive the same image source and respectively project one image and another image corresponding to the image source. The two images overlap the same part of the image source to form an overlapping area. The projection device includes a lens, a light-shielding component, and a processor. The light shielding member is provided on the lens. The processor controls the light shielding component to selectively shield a local area of the lens according to the brightness of the image source, and this local area corresponds to the overlay area.

In order to have a better understanding of the above and other aspects of the present invention, examples are given below and are described in detail with reference to the accompanying drawings:

100:Projection system

110: First projection device

111: Lens module

111L: Lens

112:Light shielding parts

113: Processor

114:Output interface

115:Input interface

120: Second projection device

130:Image provider

140:Projection surface

A:node

A1,A2: non-overlapping areas

IMG: full image

IMG1:First Image

IMG2: Second image

IMS: image source

OA: overlap area

S100: Projected image correction method

S110, S120, S130, S140, S150, S151, S152, S153, S154, S155, S1511, S1512, S160, S170, S180: Steps

Figure 1 is a schematic diagram of a projection system according to an embodiment of the present invention, illustrating a situation in which the projection image correction method of the present invention has not been followed; Figure 2 is a schematic diagram of a projection system according to an embodiment of the present invention, illustrating a situation in which the projection image correction method of the present invention has not been followed. The situation of the projection image correction method of the invention; Figure 3 shows a block diagram of the first projection device according to one embodiment of the present invention; Figure 4 is a flow chart of the projection image correction method according to one embodiment of the present invention; Figure 5 Figure 6 illustrates a flow chart of the steps of controlling the light-shielding component according to the brightness of the image source according to one embodiment of the present invention; Figure 6 illustrates the method of obtaining the corresponding overlay area of the image source according to one embodiment of the present invention. A flow chart of the minimum brightness step; and FIG. 7 is a flow chart of additional steps for a projection image correction method according to an embodiment of the present invention.

The present invention uses a light-shielding component to shield a local area of the lens to block the light projected to the superimposed area, thereby improving the problem of excessive brightness in the superimposed area in some cases.

Each embodiment of the present invention will be described in detail below, with drawings as examples. In addition to these detailed descriptions, the present invention can also be widely implemented in other embodiments. Easy substitutions, modifications, and equivalent changes of any described embodiments are included in the scope of the present invention and are subject to the scope of subsequent patents. shall prevail. In the description of the specification, many specific details and implementation examples are provided to enable readers to have a more complete understanding of the present invention; however, these specific details and implementation examples should not be regarded as limitations of the present invention. In addition, well-known steps or components are not described in detail to avoid unnecessarily limiting the present invention.

Figure 1 is a schematic diagram of a projection system 100 according to an embodiment of the present invention, illustrating a situation in which the projection image correction method of the present invention has not been adopted. Figure 2 is a schematic diagram of a projection system 100 according to an embodiment of the present invention, illustrating the projection image correction method according to the present invention.

Referring to FIG. 1 , the projection system 100 includes a first projection device 110 , a second projection device 120 and an image provider 130 . first projection device 110 The second projection device 120 receives the same image source IMS from the image provider 130, and respectively projects the first image IMG1 corresponding to the first part of the image source IMS and the second image IMG2 corresponding to the second part of the image source IMS on the projection surface. 140 to display a complete image IMG. Among them, the first image IMG1 and the second image IMG2 overlap the same part of the image source IMS to form an overlapping area OA on the projection surface 140 .

To achieve this effect of splicing images, the first projection device 110 and the second projection device 120 are usually of the same or similar model, and therefore their output brightness capabilities are also the same or similar. Generally, the first projection device 110 and the second projection device 120 respectively adjust the brightness of the light projected to the overlapping area OA, for example, each reduce the brightness of the light projected to the overlapping area OA by half, so that the overlap The brightness of the light in the area OA is roughly similar to the brightness of the non-overlapping areas A1 and A2, so as to prevent the brightness of the light in the overlapping area OA from being too bright compared with the non-overlapping areas A1 and A2.

However, the first projection device 110 and the second projection device 120 have a minimum output brightness limit; that is, the images projected by the first projection device 110 and the second projection device 120 will not be "completely black", but still have A little brightness. When the overall brightness of the image source IMS is low, for example, when the scene is projected at dusk or even at night, although the first projection device 110 and the second projection device 120 project to the non-overlapping areas A1 and A2 The brightness of the light is still greater than its respective minimum output brightness, but the brightness of the light projected to the overlapping area OA cannot be adjusted below its respective minimum output brightness, so that the first projection device 110 and the second projection device 120 still project light to the overlapping area OA with their respective lowest output brightness. As a result, the brightness of the overlapping area OA will be higher than that of the non-overlapping areas A1 and A2, as shown in Figure 1.

For convenience of explanation, an example is given here, but it is not used to limit the present invention. If the minimum output brightness of the first projection device 110 and the second projection device 120 is 30 lumens (1m) respectively, and it is now desired to project an image source IMS with a brightness of 50 lumens onto the projection surface 140, then the first projection device 110 and The second projection device 120 can still project the first image IMG1 and the second image IMG2 with a brightness of 50 lumens to the non-overlapping areas A1 and A2. However, the first projection device 110 and the second projection device 120 are unable to halve the light brightness projected to the overlapping area OA (that is, respectively reduce the light brightness projected to the overlapping area OA to 25 lumens which is less than 30 lumens). ); On the contrary, the first projection device 110 and the second projection device 120 will respectively project light to the overlapping area OA with a brightness of 30 lumens, so that the light brightness of the overlapping area OA is 60 lumens, which is inversely higher than that of the non-overlapping areas A1 and A1. The brightness of A2 is even brighter.

In order to solve this problem, as shown in FIG. 1 , one of the projection devices (in this example, the first projection device 110 ) further includes a light-shielding component 112 disposed on the lens 111L of the first projection device 110 . The first projection device 110 can control the light shielding component 112 to selectively shield a local area of the lens 111L according to the brightness of the image source IMS.

Please refer to FIG. 2 . The light shielding member 112 is installed in a local area of the lens 111L, and this local area corresponds to the overlapping area OA. Specifically, the light shielding member 112 is installed on the lens 111L of the first projection device 110 to project light onto the stack. at the location of the combined area. When the brightness of the image source IMS meets certain conditions (such as but not limited to the conditions mentioned in the above examples), the light-shielding component 112 can be controlled to block a local area of the lens 111L, so that the first projection device 110 projects to the overlapping area OA. Light is completely blocked. At the same time, the second projection device 120 does not reduce the brightness of the light projected to the overlapping area OA; that is, the second projection device 120 can project a second image with the same brightness to the overlapping area OA and the non-overlapping area A2 at the same time. IMG2. In this way, the brightness of the complete image IMG projected onto the projection surface 140 can present a uniform visual experience.

Please refer to FIG. 3 , which illustrates a block diagram of the first projection device 110 according to an embodiment of the present invention. The first projection device 110 includes a lens module 111, a processor 113, an output interface 114 and an input interface 115. The processor 113 is coupled to the lens module 111, the output interface 114 and the input interface 115 respectively. The light shielding member 112 is provided on the lens 111L of the lens module 111. In addition, the output interface 114 is also coupled to the light-shielding component 112 .

As shown in Figures 1 to 3, the processor 113 can receive the first image IMG1 corresponding to the first part of the image source IMS through the input interface 115, and transfer the first image IMG1 to the projection module 111 for use by the projection module 111 Project the first image IMG1 to the projection surface 140 . In addition, the processor 113 can also selectively transmit a shielding signal to the light-shielding component 112 through the output interface 114 according to the brightness of the image source IMS to instruct the light-shielding component 112 to block a local area of the lens 111L.

FIG. 4 is a flow chart of a projection image correction method S100 according to an embodiment of the present invention. Please refer to Figures 1 to 4. First, in step S110, the first cast The projection device 110 and the second projection device 120 receive the same image source IMS, and respectively project the first image IMG1 and the second image IMG2 corresponding to the image source IMS. Here, the first projection device 110 and the second projection device 120 can respectively receive the image data of the first image IMG1 corresponding to the first part of the image source IMS and the second image IMG2 corresponding to the second part of the image source IMS, and based on the respective The received image data projects an image beam to the projection surface 140 to form a first image IMG1 and a second image IMG2 corresponding to the image data on the projection surface 140 .

Next, in step S120, the first projection device 110 and the second projection device 120 are respectively adjusted so that the first image IMG1 and the second image IMG2 overlap the same part of the image source IMS to form an overlapping area OA. Then, in step S130, the light shielding member 112 is provided on the lens 111L of the first projection device 110. Specifically, the light shielding member 112 is installed in a local area of the lens 111L, and this local area corresponds to the position where the lens 111L projects light to the overlapping area OA.

Then, in step S150, the processor 113 of the first projection device 110 controls the light shielding component 112 according to the brightness of the image source IMS, so that the light shielding component 112 selectively blocks a local area of the lens 111L of the first projection device 110.

FIG. 5 illustrates a flowchart of step S150 of controlling the light-shielding component 112 according to the brightness of the image source IMS according to an embodiment of the present invention. Furthermore, before step S150, the minimum output brightness of the first projection device 110 and the second projection device 120 must be obtained first, as shown in step S140 in Figure 4.

Next, please refer to Figures 1 to 3 and Figure 5. In step S151, the processor 113 obtains the lowest brightness of the overlapping area OA corresponding to the image source IMS. Here, Please refer to FIG. 6 first, which illustrates a flow chart of step S151 of obtaining the minimum brightness corresponding to the overlapping area OA of the image source IMS according to an embodiment of the present invention. In step S1511, the processor 113 analyzes the image data of the first image IMG1 corresponding to the overlapping area OA. In step S1512, the processor 113 obtains the lowest brightness of the overlapping area OA corresponding to the image source IMS according to the grayscale value of the image data. That is to say, the processor 113 can calculate the lowest brightness of the overlapping area OA corresponding to the image source IMS based on the grayscale value of the image data of the first image IMG1.

Returning to Figures 1 to 3 and Figure 5, next, in step S153, the processor 113 determines whether the minimum brightness is lower than a threshold value. The threshold value can be calculated through step S152. In step S152, the processor 113 calculates the threshold value based on the lowest output brightness of the first projection device 110 and the second projection device 120 (known in step S140). For example, if the minimum output brightness of the first projection device 110 and the second projection device 120 is 30 lumens respectively, the threshold value may be the sum of the minimum output brightness of the first projection device 110 and the second projection device 120 , that is, is 60 lumens.

If it is determined that the minimum brightness is lower than the threshold value, step S154 is executed, and the processor 113 sends a shielding signal to the light-shielding component 112 through the output interface 114, so that the light-shielding component 112 blocks the local area of the lens 111L, so that the light projected to the overlay area OA is Light is completely blocked. If it is determined that the minimum brightness is not lower than the threshold value, step S155 is performed, and the processor 113 does not send a shielding signal to control the light shielding component 112 not to shield the local area of the lens 111L.

That is to say, if it is found that the lowest brightness of the image source IMS corresponding to the overlay area OA is lower than the preset threshold, the light shielding component 112 can be immediately controlled to block the light projected to the overlay area OA, solving the problem of overlay in some cases. The problem of excessive brightness in the combined area OA. In addition, since the first projection device 110 and the second projection device 120 are usually the same or similar models, they should have the same or close minimum output brightness. Therefore, for the dual projection device of this embodiment, the threshold value can be preset to twice the minimum output brightness. However, in practical applications, the threshold value can be adjusted according to actual usage conditions.

FIG. 7 is a flowchart of additional steps for the projection image correction method S100 according to an embodiment of the present invention. Please refer to Figures 1 to 4 and Figure 7. In the present invention, the output interface 114 may include at least one connection terminal. In one embodiment, the connection terminal may be a trigger terminal, and the trigger terminal may be suitable for switching modes of the first projection device 110 . Specifically, before step S110, the mode of the first projection device 110 may be switched in advance.

As shown in step S160 of FIG. 7 , the processor 113 may first receive a control signal through the input interface 115 . The user can select which mode the first projection device 110 currently wants to enter according to his or her needs, for example, perform input operations through a remote control, pressing physical buttons, clicking on the touch screen on the first projection device 110, etc., to issue controls. The signal causes the processor 113 to selectively switch the first projection device 110 to a light shielding component control mode (step S170) or an external device control mode (step S180) according to the control signal. If the mode is switched to the light-shielding component control mode, the node A is connected and the subsequent process of step S110 is continued. At this time, the output The trigger terminal of the interface 114 is coupled to the light-shielding component 112; once it is found that the minimum brightness of the overlapping area OA corresponding to the image source IMS is lower than a preset threshold, the processor 113 can send a blocking signal to the light-shielding component 112 through the trigger terminal. If it is switched to the external device control mode, the trigger terminal of the output interface 114 is switched to be coupled to an external device, such as an electric curtain; when the power of the first projection device 110 is turned on, the processor 113 can The trigger terminal sends a start signal to the electric curtain, causing the electric curtain to automatically lower. At this time, the subsequent process of step S110 is no longer performed. Therefore, the user can select the control mode of the first projection device 110 according to whether the image splicing process is currently required to determine the coupling object of the trigger terminal of the output interface 114 .

In addition, the connection terminal may be a terminal other than the trigger terminal. In other embodiments, the connection terminal may be an HDMI terminal or a USB terminal, which is also suitable for coupling with the light-shielding component 112 .

To sum up, according to the projection device, projection system and projection image correction method provided by the present invention, by disposing a light-shielding component on the lens of one of the projection devices, the light-shielding component is ordered to block a local area of the lens under certain circumstances to block the The light projected into the overlay area improves the problem of the overlay area being too bright in some cases.

Although the present invention has been described above using embodiments, they are not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the present invention belongs can make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended patent application scope.

100:Projection system

110: First projection device

111L: Lens

112:Light shielding parts

120: Second projection device

130:Image provider

140:Projection surface

A1,A2: non-overlapping areas

IMG: full image

IMG1:First Image

IMG2: Second image

IMS: image source

OA: overlap area

Claims (20)

A projection system includes: a first projection device, including a lens and a light-shielding component, the light-shielding component being arranged on the lens; and a second projection device, the first projection device and the second projection device receive the same image source , and respectively project a first image and a second image corresponding to the image source. The first image and the second image overlap the same part of the image source to form an overlapping area; wherein the first projection device is based on The brightness of the image source controls the light shielding component to selectively shield a local area of the lens, and the local area corresponds to the superimposed area. The projection system of claim 1, wherein when the first projection device controls the light-shielding component to block the local area, the light-shielding component completely blocks the light projected by the first projection device to the overlapping area. The projection system of claim 1, wherein when the minimum brightness of the image source corresponding to the overlapping area is lower than a threshold, the first projection device controls the light-shielding component to block the local area of the lens. The projection system of claim 3, wherein the threshold value is the sum of the lowest output brightness of the first projection device and the second projection device. The projection system of claim 3, wherein the first projection device includes a processor that analyzes an image data corresponding to the overlay area of the first image and obtains the image data based on the grayscale value of the image data. The image source corresponds to the lowest brightness of the overlay area. The projection system of claim 5, wherein the first projection device further includes an input interface and an output interface, the processor is coupled to the input interface and the output interface respectively, and the output interface is coupled to the light shielding interface. A component, wherein the processor receives the image data through the input interface and selectively transmits a shielding signal to the light shielding component through the output interface according to the image data. The projection system of claim 6, wherein the output interface includes at least one connection terminal, and the at least one connection terminal is a trigger terminal, an HDMI terminal or a USB terminal. The projection system of claim 6, wherein the processor further receives a control signal through the input interface, and selectively switches the first projection device to a light shielding component control mode or an external device control according to the control signal. model; When the first projection device switches to the light-shielding component control mode, the processor selectively transmits the blocking signal to the light-shielding component according to the image data. A projection image correction method suitable for a first projection device and a second projection device. The method includes: the first projection device and the second projection device receive the same image source and respectively project a first image corresponding to the image source. image and a second image; adjust the first projection device and the second projection device so that the first image and the second image overlap the same part of the image source to form an overlay area; and according to the image source The brightness controls a light-shielding component located on the first projection device so that the light-shielding component selectively blocks a local area of a lens of the first projection device, and the local area corresponds to the overlapping area. The projection image correction method according to claim 9, wherein in the step of controlling the light-shielding component, the light-shielding component completely blocks the light projected by the first projection device to the overlapping area. The projected image correction method according to claim 9, wherein the step of controlling the light-shielding component according to the brightness of the image source includes: obtaining the lowest brightness of the image source corresponding to the overlay area; and When the lowest brightness of the image source corresponding to the overlapping area is lower than a threshold, the first projection device controls the light-shielding component to block the local area of the lens. The projection image correction method of claim 11, wherein the threshold value is the sum of the lowest output brightness of the first projection device and the second projection device. The projection image correction method according to claim 11, wherein the step of obtaining the lowest brightness of the image source corresponding to the overlay area includes: a processor of the first projection device analyzes a value of the first image corresponding to the overlay area. Image data, and obtain the lowest brightness of the image source corresponding to the overlay area based on the grayscale value of the image data. The projection image correction method according to claim 13, further comprising: the processor receiving a control signal, and selectively switching the first projection device to a light shielding component control mode or an external device control mode according to the control signal. ; wherein when the first projection device switches to the light-shielding component control mode, the processor executes the step of controlling the light-shielding component according to the brightness of the image source. A projection device. The projection device and an external projection device receive the same image source and respectively project an image and another image corresponding to the image source. The two images overlap the same part of the image source to form an overlapping area. The projection device includes: a lens; a light-shielding component disposed on the lens; and a processor, which controls the light-shielding component to selectively block a local area of the lens according to the brightness of the image source, and the local area corresponds to this overlapping area. The projection device of claim 15, further comprising an output interface coupled to the processor and the light-shielding component respectively; wherein the processor determines whether the minimum brightness of the image source corresponding to the overlay area is lower than a threshold value , when it is determined that it is lower than the threshold, the processor sends a shielding signal to the light-shielding component through the output interface, so that the light-shielding component blocks the local area of the lens. The projection device of claim 16, wherein the threshold value is the sum of the lowest output brightness of the first projection device and the second projection device. The projection device of claim 16, wherein the output interface includes at least one connection terminal, and the at least one connection terminal is a trigger terminal, an HDMI terminal or a USB terminal. The projection device of claim 16, further comprising an input interface coupled to the processor; wherein the processor receives the image through the input interface, analyzes the image corresponding to an image data of the overlay area, and based on The grayscale value of the image data obtains the lowest brightness of the image source corresponding to the overlay area. The projection device of claim 19, wherein the processor further receives a control signal through the input interface, and selectively switches the first projection device to a light shielding component control mode or an external device control according to the control signal. mode; wherein when the first projection device switches to the light-shielding component control mode, the processor selectively transmits the blocking signal to the light-shielding component according to the image data.

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