CN111586377A - Projection system and projection splicing method thereof - Google Patents
Projection system and projection splicing method thereof Download PDFInfo
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- CN111586377A CN111586377A CN201910116045.8A CN201910116045A CN111586377A CN 111586377 A CN111586377 A CN 111586377A CN 201910116045 A CN201910116045 A CN 201910116045A CN 111586377 A CN111586377 A CN 111586377A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3188—Scale or resolution adjustment
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Abstract
The invention provides a projection system with a plurality of projection devices and a processing device. The projection device respectively projects a plurality of sub-projection pictures according to the arrangement position. The adjacent sub-projection pictures respectively have an overlapping area, and the sub-projection pictures form a combined projection picture. The processing device is connected with the projection device and outputs image signal streams corresponding to the plurality of sub-projection pictures to the projection device, so that the projection device projects a combined projection picture, and the combined projection picture still keeps the integral uniformity in the process of image splicing. The invention also provides a projection splicing method. The projection device and the projection splicing method thereof distribute the part of the image to each projection device so as to keep the quality of image viewing in the process of image splicing.
Description
Technical Field
The present invention relates to a projection technology, and more particularly, to a projection system and a projection splicing method thereof.
Background
With the development of diversification of business behaviors, the projection device is also applied to various types of exhibition fields. In order to pursue a more novel visual effect and break through the limitation of the device, a common projection device mostly has an image splicing function, so that a plurality of projection devices form an integral projection system to project a spliced image. Therefore, the flexibility of designing the image size by a user is improved.
However, in the process of splicing the pictures by a plurality of projection devices, the projection ranges of the projection devices overlap. In order to maintain continuity of the finally presented screen, the projection apparatus has a function of image deformation. The projection device can align the image of the image overlapping region through the function of image deformation. However, in the entire projection system, the images projected by all the projection apparatuses are deformed to align the overlapping regions, and the image quality is deteriorated as the deformation amount is larger. If the sizes of the overlapping ranges of the two projection devices in the projection system are different, and the deformation of the projection devices after aligning the overlapping regions is different, the image content is non-uniform, and the quality of the viewed image is reduced.
In addition, in the image stitching application, if a display card is used, the display card has output ports, and the proportion of the overlapped area of each output port needs to be the same. In addition, the installation of the projection device needs to be careful that the position of the projection device needs to meet the requirement of the same proportion of the overlapping area, thereby reducing the elasticity of the installation position of the projection device.
Disclosure of Invention
The invention provides a projection device and a projection splicing method thereof, which are used for distributing parts of images to each projection device so as to keep the quality of image viewing in the image splicing process.
To achieve one or a part of or all of the above or other objects, a projection system according to an embodiment of the invention has a plurality of projection devices and a processing device. The projection device respectively projects a plurality of sub-projection pictures according to the arrangement position. The adjacent sub-projection pictures respectively have an overlapping area, and the plurality of sub-projection pictures form a combined projection picture. The processing device is connected with the projection device and outputs image signal streams corresponding to the plurality of sub-projection pictures to the projection device, so that the plurality of projection devices project combined projection pictures.
To achieve one or a part of or all of the above or other objects, an embodiment of the present invention provides a projection stitching method. The projection splicing method is suitable for a projection system, and the projection system is provided with a plurality of projection devices and a processing device. The projection splicing method comprises the following steps: the projection device respectively projects a plurality of sub-projection pictures according to the arrangement position, the adjacent sub-projection pictures respectively have an overlapping area, and the plurality of sub-projection pictures can form a combined projection picture; the processing device outputs the image signal streams corresponding to the sub-projection pictures to the projection devices, so that the projection devices project the combined projection picture.
Based on the above, the projection system and the image stitching method of the present invention respectively divide the image according to the overlapping range between the projection apparatuses to distribute the portion of the image to each projection apparatus and maintain the uniformity of the whole image.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1A is a schematic view of a projection system according to an embodiment of the invention.
FIG. 1B is a schematic diagram of a conventional projection system projecting a picture.
FIG. 1C is a schematic diagram of the projection system of FIG. 1B projecting a combined projection image.
FIG. 1D is a schematic view of a projection system projecting a picture according to an embodiment of the invention.
FIG. 1E is a schematic diagram of the projection system of FIG. 1D projecting a combined projection image.
Fig. 2 is a schematic flow chart of a projection splicing method according to an embodiment of the invention.
FIG. 3 is a schematic view of the layout position according to an embodiment of the present invention.
FIG. 4 is a schematic diagram of an assembled projection image according to an embodiment of the invention.
Detailed Description
FIG. 1A is a schematic view of a projection system according to an embodiment of the invention. Referring to fig. 1A, in an embodiment of the invention, a projection system has a plurality of projection devices 110a, 110b, 110c, such as a plurality of projectors. Each of the projection devices 110a, 110b, 110c projects a sub projection screen SA1, SA2, SA3, respectively. When the plurality of projection devices 110a, 110b, and 110c are used to present a tiled picture (combined projection picture), based on the placement positions of the plurality of projection devices 110a, 110b, and 110c, the sub-projection pictures SA1, SA2, and SA3 projected by each projection device 110a, 110b, and 110c form adjacent sub-projection pictures SA1 and SA2 and another adjacent sub-projection pictures SA2 and SA3, respectively, having overlapping regions, as indicated by the diagonal blocks in fig. 1A. The adjacent sub-projection screens SA1, SA2, and SA3 together form a combined projection screen (a mosaic screen), i.e., from the left end of the sub-projection screen SA1 to the right end of the sub-projection screen SA3 in fig. 1A, which will be described in detail later. It should be noted that the configuration of the projection devices 110a to 110c, the range of the sub-projection frames, the range of the overlapping area, and the like shown in fig. 1A are all schematic, and the invention is not limited thereto.
The projection devices 110a to 110c are configured to receive the signal streams of the corresponding images, and project the sub-projection images to the projection surface according to the signal streams of the respective images. The projection surface is for example a wall or a projection screen. In the embodiments of the present invention, any projector capable of projecting images and supporting the image stitching function can be used in the present invention.
In an embodiment of the invention, the projection system includes a processing device 120, and the processing device 120 is connected to the projection devices 110a to 110c and configured to output image signal streams corresponding to the sub-projection screens SA1 to SA3 to the projection devices 110a to 110c, so that the projection devices 110a to 110c project images according to the image signal streams. It should be noted that, in an embodiment of the invention, if the processing device 120 and the projection devices 110a to 110c are in the splicing mode, the processing device 120 has a function of cutting the image frame, and after the image frame is cut, the image signal streams corresponding to the portions of each image frame are respectively transmitted to the projection devices 110a to 110c in charge according to the portions of the image frame in charge of the different projection devices 110a to 110 c. In an embodiment of the invention, the processing device 120 is implemented by various hardware including at least a processing unit, a signal input unit and a signal output unit. The Processing Unit is, for example, a splitter (Cropping Device), a Central Processing Unit (CPU), a Microprocessor (Microprocessor), a Digital Signal Processor (DSP), a Programmable Logic Device (PLD), or other similar devices or combinations thereof, and the invention is not limited thereto. The signal input unit is used for receiving a signal stream of an image. For example, the signal input unit is a connection Interface for receiving digital signals, such as an RS-232 Interface, a Universal Serial Bus (USB), a Display data channel Interface (Display data channel Interface), a Wireless fidelity (WiFi), an RJ45 Interface, a High Definition Multimedia Interface (HDMI), a Digital Video Interface (DVI), and the like. Alternatively, the signal input unit receives analog signals, such as an S terminal, an AV terminal, and a VGA terminal (Video Graphics Array connector). Alternatively, the signal input unit may be a combination selected from the plurality of interfaces described above, and the present invention is not limited thereto. The signal output unit is used for connecting to the projection devices 110a to 110c to output image signals to the projection devices 110a to 110 c. Whether using a wired connection or a wireless connection. The signal output unit may be implemented by hardware similar to the signal input unit, and the present invention is not limited thereto.
It should be noted that, in an embodiment of the present invention, the control device 120 has a communication unit (for example, a WiFi chip, a bluetooth chip, or a network chip using RJ45 interface and supporting a wired network, etc.), and the user can connect to the control device 120 through a terminal device such as a mobile phone, a personal computer, a notebook computer, a tablet computer, etc. Therefore, various setting commands can be transmitted to the control device 120, and the invention is not limited thereto.
FIG. 1B is a schematic diagram of a conventional projection system projecting a picture. FIG. 1C is a schematic diagram of the projection system of FIG. 1B projecting a combined projection image. Referring to fig. 1, 1B and 1C, in the conventional projection system, as shown in fig. 1, each of the projection devices 110a, 110B and 110C projects a sub-projection image SA1, SA2 and SA3, respectively, the distance between two projection devices is different based on the placement positions of the projection devices 110a, 110B and 110C, so that the sub-projection images SA1, SA2, SA3 projected by each projection device 110a, 110b, 110c form an overlapping area, as indicated by the hatched blocks in fig. 1A, such as the overlapping area of the adjacent sub-projection pictures SA1 and SA2 and the overlapping area of the other adjacent sub-projection pictures SA2 and SA3, wherein the two overlapping areas have different areas, i.e. the proportion of the overlapping areas is different, for example, the proportion of the overlapping areas of the adjacent sub-projection pictures SA1 and SA2 is 20%, and the proportion of the overlapping area of the other adjacent sub-projection pictures SA2 and SA3 is 50%. The plurality of projection devices 110a, 110b, and 110c project image frames having the same size, wherein the ratio of the overlap area is the ratio of the overlap area to the original image frame (e.g., the image frame originally projected by the projection device).
When the control device 101 and the plurality of projection devices 110a, 110b, and 110C project the combined projection screen C (in the mosaic mode), the control device 101 receives an original image screen from an image source, such as a mobile phone, a personal computer, a notebook computer, and a tablet computer, and the control device 101 divides the original image screen and provides image signal streams to the corresponding plurality of projection devices 110a, 110b, and 110C. As shown in fig. 1B, the control device 101 provides the first image I1, the second image I2, and the third image I3 to the projection devices 110a, 110B, and 110c, respectively, to project sub-projection images SA1 to SA 3. The first image I1, the second image I2 and the third image I3 have the same resolution and image projection size. When the control device 101 sets the ratio of the overlapping areas to be a constant value, the control device 101 in the prior art can only set one type of overlapping ratio for Scaling (Scaling) the image frames, and the control device 101 performs the segmentation according to the setting of the minimum overlapping ratio (for example, the overlapping ratio of each area is set to be 20%), so that in the overlapping area with the overlapping ratio of 50%, the control device 101 compresses the sub-projection screen SA3 to deform the content of the image, so that the content ratio of the whole combined projection screen C1 is uneven, as shown in fig. 1C. To explain further, from the comparison between the sub-projection image SA3 and the third image I3 in FIG. 1B, the result of the sub-projection image SA3 being compressed and deformed, i.e., the deformed image P _ SA3 (indicated by the dashed box) in the sub-projection image SA3, can be obtained.
FIG. 1D is a schematic view of a projection system projecting a picture according to an embodiment of the invention. FIG. 1E is a schematic diagram of the projection system of FIG. 1D projecting a combined projection image. Referring to fig. 1, fig. 1D and fig. 1E, in an embodiment of the invention, the control device 120 of the projection system cuts the original image frame according to the actual overlap area ratio, in the embodiment, the overlap area ratio is set to 20% and 50%, respectively. It is worth mentioning that, in the present invention, the overlapping proportion of the overlapping areas is different and the proportion difference between the two is more than 10%, so that the uniform effect can be achieved best.
When the control device 120 and the plurality of projection devices 110a, 110b, and 110C project the combined projection screen C (in the splicing mode), the control device 120 receives an original image screen from an image source, and the control device 120 divides the original image screen and provides image signal streams to the corresponding plurality of projection devices 110a, 110b, and 110C, respectively. As shown in fig. 1D, the control device 120 provides the first image I1, the second image I2 and the third image I3 to the projection devices 110a, 110b and 110c respectively to project sub-projection images SA1 to SA3 according to the original image. The first image I1, the second image I2 and the third image I3 have the same resolution and image projection size. When the control device 120 sets the overlap area ratios to different values, the control device 120 in this embodiment can only set different overlap ratios to perform Scaling (Scaling) of the image overlap, and the control device 120 performs the division according to the respective overlap ratios (for example, the ratio of the overlap area of the adjacent sub-projection images SA1 and SA2 is 20%, and the ratio of the overlap area of the other adjacent sub-projection images SA2 and SA3 is 50%). As shown in fig. 1E, the uniformity of the projection content can be approximately consistent because the cut scale can be cut according to the image frame scale. Further, the sub-projection image SA3 can be compared with the third image I3 in FIG. 1D to obtain the result that the sub-projection image SA3 is not compressed and deformed. It should be noted that the resolution of the original image frames may be the same or different from the resolution of the plurality of projection devices.
Fig. 2 is a schematic flow chart of a projection splicing method according to an embodiment of the invention. The projection splicing method of this embodiment is at least used in the projection system of fig. 1A, and therefore, the details of the operation of the projection system and the detailed flow of the projection splicing method will be described below with reference to fig. 1A and fig. 2.
In step S210, the projection devices 110a to 110c project a plurality of sub-projection screens according to the Layout (placement) positions (Layout), respectively. In the embodiment of the invention, the control device 120 controls the image frames output by each of the projection devices 110a to 110c, so that the projection devices 110a to 110c respectively project a plurality of sub-projection frames according to the arrangement positions.
In detail, the layout position is used to indicate the layout manner of the sub-images into which the image is cut, and can be adjusted according to the selection of the user. In the present embodiment, the user sets the layout position in the control device 120, where the layout position can be represented as mxn, m is the number of columns (row), and n is the number of rows (columns), that is, the number of projection devices and the layout manner. For better understanding, referring to fig. 3, fig. 3 is a schematic view illustrating the layout position according to an embodiment of the present invention. In the embodiment of fig. 3, in the control device 120, the layout positions are, for example, 1x1, 1x2, 1x3, and 2x1, and each tile represents a tile projected by one projection device. In addition, the channels 1, 2, and 3 respectively indicate that the control device 120 outputs the video signal stream to different projection devices, but the number of channels is not limited. The control device 120 not only divides the image according to the layout position set by the user, but also further distributes the parts of the image frame after the division to the projection devices 110a, 110b, 110c and outputs the parts to the projection devices 110a, 110b, 110 c.
For example, if the layout position is 1 × 1, it indicates that the image frame is not cut. In this embodiment, if the layout position is 1 × 1, the control device 120 controls all the projection devices 110a, 110b, and 110c to project the same image frame on the corresponding sub-projection frames.
In the present embodiment, the layout position is 1 × 3, which means that three projection apparatuses are arranged in a row. The image frame is divided into three regions, thereby generating three sub-image frames corresponding to the image frame. At this time, the control device 120 controls the projection devices 110a to 110c to project sub-projection screens SA1, SA2, and SA3, which are different sub-image screens, respectively. Specifically, the user sets the channel 1 of the control device 120 to input the signal of the leftmost projection screen and perform screen segmentation, the channel 2 to input the signal of the middle projection screen and perform screen segmentation, and the channel 3 to input the signal of the rightmost projection screen and perform screen segmentation.
In addition, in an embodiment of the present invention, a user can define different layout positions by himself/herself, and the present invention is not limited to the layout positions shown in fig. 3. In this embodiment, the layout position is 1 × 3, but the present invention is not limited thereto. In addition, the projection apparatuses 110a to 110c and the overlap areas discussed in the following embodiments are all based on the activated projection apparatuses. If the layout position set by the user causes any of the projection devices to be turned off, the processing device 120 will not process the turned-off projection device because the turned-off projection device does not project the image.
In step S220, the processing device 120 obtains the resolution of the combined projected image C and the start coordinates of each sub-projected image in the combined projected image C according to the layout position, the resolutions of the projection devices 110a to 110C and the overlap ratio of the overlap areas. FIG. 4 is a schematic diagram of an assembled projection image according to an embodiment of the invention. The combined projection image shown in fig. 4 is formed by combining the sub-projection images SA 1-SA 3 projected by the projection apparatuses 110 a-110C of fig. 1A, and the combined projection image C is different according to the arrangement of the projection apparatuses 110 a-110C and the overlapping ratio of the overlapping areas, which is only used for illustration and the invention is not limited thereto. Details of step S220 will be described below with reference to fig. 1A and 4.
In an embodiment of the invention, the processing device 120 obtains the layout positions, the resolution of each of the projection devices 110a to 110c, and the overlapping ratio of the overlapping areas. Specifically, in the process of stitching the projection images, the user sets the image layout positions to determine the stitching method of the sub-projection screens SA1 to SA3 of the projection devices 110a to 110 c. In addition, the processing device 120 provides an input interface through a terminal device (e.g., a mobile phone, a computer, etc.) of the user, so as to provide the user with setting the overlapping ratio of the overlapping area or directly set in the processing device 120. Therefore, the processing device 120 can obtain the layout position and the overlapping ratio of the overlapping area of each of the projection devices 110a to 110c according to the setting of the user.
The processing device 120 also obtains the resolution of each of the projection devices 110 a-110 c. For example, the processing device 120 may also provide a setting interface for the user to set the overlapping ratio of the overlapping areas. Alternatively, the processing device 120 may acquire the resolutions from the projection devices 110a to 110c by exchanging information with the projection devices 110a to 110 c. The present invention is not limited to the above-described manner of obtaining the arrangement position, the overlapping ratio of the overlapping area, and the resolution of each of the projection devices 110a to 110 c. In this embodiment, for example, the resolution of each of the projection devices 110 a-110 c is set to 1920 × 1080pixels, as shown in fig. 1A, the overlap ratio of the sub-projection image SA1 and the sub-projection image SA2 is 20%, and the overlap ratio of the sub-projection images SA2 and SA3 is 50%, but the invention is not limited thereto.
In an embodiment of the invention, after the processing device 120 obtains the layout positions, the resolutions of the projection devices 110a to 110C, the layout positions, and the overlapping ratios of the overlapping areas, the total resolution values of the projection devices 110a to 110C are determined according to the layout positions and the resolutions of the projection devices 110a to 110C, and the resolutions of the portions belonging to the overlapping areas are excluded according to the layout positions and the overlapping ratios of the corresponding overlapping areas, so as to obtain the resolution of the combined projection frame C.
Specifically, since the layout position adopted in the present embodiment is 1x3, that is, the total resolution value obtained by the projection devices 110a to 110c is (1x1080) x (3x1920), that is, 1080x5760 pixels. Since there is only one column corresponding to the projection devices 110a to 110c, the sub-projection screens SA1 to SA3 do not overlap each other in the height of the image in the column portion. Accordingly, only the problem of the sub-projection screens SA1 to SA3 overlapping in width will be discussed below.
After obtaining the total resolution value, the processing device 120 may further exclude the resolution belonging to the overlapping area portion. As described above, the overlap ratio of the sub projection screen SA1 and the sub projection screen SA2 is 20%, and the overlap ratio of the sub projection screen SA2 and the sub projection screen SA3 is 50%. That is, 384 pixels of the sub projection screen SA1 resolution width overlap with the sub projection screen SA2, and 960 pixels of the sub projection screen SA2 resolution width overlap with the sub projection screen SA 3. After excluding the overlapping portion, the processing device 120 can acquire the resolution width W of the combined projection picture C as 4416.
It should be noted that, in another embodiment of the present invention, the processing device 120 obtains the resolution width of the combined projection frame in an accumulation manner according to the layout position and the overlapping ratio of the overlapping area. For example, the processing device 120 sums the resolution widths (i.e., 3840 pixels) of the sub-projection images SA1 and SA2, and excludes the overlapping area (i.e., 384 pixels) to obtain the resolution width W1+ W2 of 3456 pixels composed of the sub-projection images SA1 and SA 2. Then, the processing device 120 adds the resolution width (i.e., 1920pixel) of the sub-projection image SA3 to the resolution width (i.e., 3456pixel) formed by the sub-projection images SA1 and SA2, and excludes the overlapping portion (i.e., 960pixel) of the sub-projection images SA2 and SA3 to obtain the resolution width W1+ W2+ W3 formed by the sub-projection images SA1 to SA3 as 4416.
In addition, the processing device 120 obtains the start coordinates P1 to P3 of each of the sub-projection images SA1 to SA3 in the combined projection image according to the layout position, the resolution of the projection devices 110a to 110c and the overlapping ratio of the overlapping area. Specifically, the processing device 120 further uses an end point of the combined projection screen as a reference origin, for example, the left end point of fig. 4 as the reference origin. Accordingly, the processing device 120 obtains the start coordinates of the overlapping area from the sub-projection image SA1 closer to the reference origin according to the sequence of the layout positions and the resolutions of the projection devices 110 a-110 c and the corresponding overlapping ratios, and sets the start coordinates of the overlapping area as the start coordinates of the next adjacent sub-projection image. In this embodiment, the sub-projection image corresponding to the reference origin is SA1 according to the position relationship between the layout position and the reference origin. Therefore, the processing device 120 sets the reference origin as the start coordinate P1 of the sub-projection screen SA 1.
Then, the processing device 120 determines that 384 pixels of the resolution width of the projection image SA1 overlap with the sub-projection image SA2 according to the determined overlap ratio of the sub-projection image SA1 and the sub-projection image SA 2. Then, depending on the arrangement position and the resolution of the sub projection screen SA1, the processing device 120 can determine that 384 pixels are overlapped areas from the position of 1536 pixels in the resolution width of the combined projection screen. Accordingly, the processing device 120 sets the start point of the overlap region, i.e. 1536 pixels, as the start coordinate P2 of the sub-projection screen SA 2.
Similarly, the processing device 120 determines that the sub-projection image SA2 ranges from 1536 pixels of resolution width to 1920 pixels, and the final resolution width 960 pixels overlaps with the sub-projection image SA 3. Therefore, the processing device 120 sets the start point of the overlapped block (i.e., 1536+ 1960-. The position coordinates output by the processing device 120 after calculation of the channels 1-3 are calculated as the following table one:
watch 1
In step S230, the processing device 120 cuts the image according to the resolution of the original image frame and the combined projection frame and the start coordinates of the sub-projection frames. Specifically, the processing device 120 obtains the projection content of the corresponding image of each sub-projection frame according to the product of the ratio of the initial coordinates of the sub-projection frames SA 1-SA 3 in the combined projection frame to the resolution of the combined projection frame and the resolution of the original image frame, so as to segment the image.
For example, if the resolution of the original image frame is 1024x 768. In addition, in the above example, the resolution of the combined projection screen is 4416, and the resolutions of the projection apparatuses 110a to 110c are 1920 × 1080. At this time, the processing unit 120 obtains a ratio of the start coordinate of the sub-projection screen SA1 in the combined projection screen to the resolution of the combined projection screen, which is equivalent to a ratio of the start coordinate of the sub-projection screen SA1 to the entire width of the combined projection screen, i.e., 0/4416 is equal to 0. Moreover, the processing unit 120 further calculates the product of the ratio of the initial coordinates of the sub-projection image SA1 in the combined projection image to the resolution of the combined projection image and the resolution width of the original image. From another perspective, this corresponds to the coordinates of the sub-projection image SA1 when the start coordinates on the combined projection image correspond to the resolution width of the original image, i.e., 0x1024 is equal to 0. Since the starting coordinates of the sub-projection image SA1 in the combined projection image are the reference origin, the corresponding coordinates corresponding to the resolution width of the image are also the origin.
Similarly, the processing unit 120 calculates the ratio of the initial coordinate of the projection image SA2 in the combined projection image to the resolution of the combined projection image and the product of the ratio and the resolution width of the original image (i.e., 1536/4416 × 1024 ≈ 356.173). That is, the start coordinate for the sub-projection screen SA2 should correspond to the content of the video at 356.173 of the resolution width. From another perspective, the sub-image with the resolution width between 0 and 356.173 belongs to the projection content of the sub-projection image SA1, but does not include the overlapping region with the sub-projection image SA 2.
Similarly, the processing device 120 calculates the ratio of the initial coordinate of the projection image SA3 on the combined projection image to the resolution of the combined projection image and the product of the ratio and the image resolution (i.e., 2496/4416 × 1024 ≈ 578.783). That is, the start coordinate for the sub-projection screen SA2 should correspond to the content of the video at 578.783 of the resolution width. From another perspective, the sub-images with the resolution widths between 356.173 and 578.783 belong to the projection content of the sub-projection image SA2, but do not include the overlapping region with the sub-projection image SA 3. Moreover, the sub-images with the resolution widths of 578.783-1024 belong to the projection content of the sub-projection image SA 3. Accordingly, the processing device 120 segments the images according to the projection content of the corresponding image of each sub-projection image SA 1-SA 3.
It is worth mentioning that this embodiment is only illustrative. In other embodiments of the present invention, the processing device 120 can employ other reference origins. At this time, the process of cutting the image by the processing device 120 is adjusted according to the position of the reference origin, but the present invention is not limited to the above process of cutting the image without departing from the technical spirit of the present invention.
In addition, in other embodiments of the present invention, the process of cutting the image by the processing device 120 is also adjusted according to different layout positions. Particularly, if the layout positions correspond to a plurality of rows, such as 2x1, 3x1, etc., the projection apparatuses 110 a-110 c adjust the process of cutting the image, so as to combine the projected image and the resolution height of the image for analysis and cutting. The process of analyzing the projection image and cutting the image based on the resolution height is similar to the process of analyzing the projection image and cutting the image based on the resolution width, and is not repeated herein.
It should be noted that, in an embodiment of the present invention, the processing device 120 cuts the image according to the start coordinates of each of the projection devices 110a to 110c and the resolution of the projection device. For example, the processing device 120 calculates the size of each sub-frame corresponding to the entire image (i.e., 1920/4416x1024 ≈ 445.217). Accordingly, the processing device 120 cuts the image with the resolution width of 445.217 according to the start coordinates of each of the sub-frames SA 1-SA 3, and distributes the cut image to each of the sub-frames SA 1-SA 3. That is, the resolution of the original image frame is the same as the resolution of the projection device, and the adjacent contents of the divided images are overlapped. However, in other embodiments, the resolution of the divided original image frames is not the same as the resolution of the plurality of projection devices, and the adjacent contents of the divided original image frames are overlapped.
In step S240, the processing device 120 outputs the image signal stream of the cut original image frame to the corresponding projection devices 110a to 110 c. Thus, the projection devices 110a to 110c can respectively project the cut partial original image frames onto the sub-projection frames SA1 to SA 3.
In an embodiment of the present invention, after the processing device 120 cuts the original image frame, the projection devices 110a to 110c are further controlled to project black on the remaining portions of the non-projected image (e.g., the light output amount of the corresponding non-projected image portion on the projection device is controlled). Therefore, the combined projection picture formed by the projection of the projection devices 110a to 110c can maintain the uniformity of the picture.
It should be noted that the foregoing embodiment is described by using three projection devices 110a to 110c, and the number of projection devices 110a to 110c is not limited in the present invention.
In summary, the projection system and the image stitching method of the present invention divide the image according to the overlapping range between the projection apparatuses, so as to distribute the portion of the image to each projection apparatus and maintain the uniformity of the whole image. Moreover, the user can arrange the position of the projection device more flexibly without considering the problem of equidistant installation.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Description of reference numerals:
110a to 110 c: projection device
101. 120: processing apparatus
C: combined projection picture
I1: the first image frame
I2: the second image frame
I3: the third image frame
P1-P3: starting coordinate
P _ SA 3: deformed picture
S210 to S240: step (ii) of
SA 1-SA 3: sub-projection picture
W, W1-W3: the resolution width.
Claims (19)
1. A projection system, comprising a plurality of projection devices and a processing device, wherein:
the projection devices respectively project a plurality of sub-projection pictures according to the arrangement positions, wherein adjacent sub-projection pictures respectively have an overlapping region, and the sub-projection pictures form a combined projection picture; and
the processing device is connected with the plurality of projection devices and outputs corresponding image signal streams to the plurality of projection devices, so that the plurality of projection devices project the combined projection picture.
2. The projection system of claim 1, wherein the processing device obtains a resolution of the combined projection frame and a start coordinate of each of the sub-projection frames in the combined projection frame according to a resolution of the plurality of projection devices, the layout position, and an overlap ratio of the overlap region, and the processing device cuts the original image frame according to the resolution of the original image frame, the resolution of the combined projection frame, and the start coordinate of the plurality of sub-projection frames, and outputs the image signal stream corresponding to the cut original image frame to the corresponding plurality of projection devices.
3. The projection system of claim 2, wherein the processing device further determines a total resolution of the plurality of projection devices according to the layout position and the resolutions of the plurality of projection devices, and excludes a resolution belonging to a portion of the overlap region according to the layout position and an overlap ratio of the overlap region, so as to obtain the resolution of the combined projection image.
4. The projection system according to claim 2, wherein the processing device further obtains start coordinates of the overlap region from the plurality of sub-projection pictures closer to the reference origin point according to the order of the arrangement positions, the resolutions of the plurality of projection devices, and the corresponding overlap ratios with an end point of the combined projection picture as a reference origin point, and sets the start coordinates of the overlap region as start coordinates of a next adjacent sub-projection picture.
5. The projection system of claim 2, wherein the processing device obtains the projection content of each of the plurality of sub-projection frames corresponding to the original image frame according to a product of a ratio of a start coordinate of the plurality of sub-projection frames in the combined projection frame to a resolution of the combined projection frame and a resolution of the original image frame, so as to cut the original image frame.
6. The projection system of claim 2, wherein the resolution of the sliced original image frames is the same as the resolution of the plurality of projection devices, and adjacent content of the sliced original image frames overlaps.
7. The projection system of claim 2, wherein the resolution of the sliced original image frames is not the same as the resolution of the plurality of projection devices, and adjacent content of the sliced original image frames overlaps.
8. The projection system of claim 1, wherein the resolution of each of the projection devices is the same.
9. The projection system of claim 1, wherein the plurality of overlapping areas of the adjacent sub-projection pictures respectively have different overlapping ratios, and the difference between the overlapping ratios is greater than or equal to 10%.
10. A projection splicing method is suitable for a projection system, wherein the projection system comprises a plurality of projection devices and a processing device, and the projection splicing method comprises the following steps:
respectively projecting a plurality of sub-projection pictures by the plurality of projection devices according to the arrangement positions, wherein adjacent sub-projection pictures respectively have an overlapping region, and the plurality of sub-projection pictures form a combined projection picture; and
and outputting the corresponding image signal streams to the plurality of projection devices by the processing device so that the plurality of projection devices project the combined projection picture.
11. The projection splicing method according to claim 10, wherein the processing device obtains the resolution of the combined projection image and the start coordinates of each sub-projection image in the combined projection image according to the resolutions of the plurality of projection devices, the layout positions and the overlapping proportion of the overlapping areas;
cutting the original image picture by the processing device according to the resolution of the original image picture, the resolution of the combined projection picture and the initial coordinates of the plurality of sub-projection pictures; and
and outputting the image signal stream corresponding to the cut original image picture to the corresponding plurality of projection devices by the processing device.
12. The projection splicing method according to claim 11, wherein the step of obtaining, by the processing device, the resolution of the combined projection screen and the start coordinate of each of the sub-projection screens in the combined projection screen according to the layout position and the overlap ratio of the overlap area further comprises:
determining, by the processing unit, a total resolution value of the plurality of projection devices according to the layout position and resolutions of the plurality of projection devices; and
and eliminating the resolution of the part belonging to the overlapping area by the processing unit according to the layout position and the overlapping proportion of the corresponding overlapping area so as to obtain the resolution of the combined projection picture.
13. The projection splicing method according to claim 11, wherein the step of obtaining, by the processing device, the resolution of the combined projection screen and the start coordinates of each of the sub-projection screens in the combined projection screen according to the resolutions of the plurality of projection devices, the layout positions, and the overlap ratio of the overlap area further comprises:
the processing device takes the end point of the combined projection picture as a reference origin, and the plurality of sub-projection pictures closer to the reference origin acquire the initial coordinates of the overlapping area according to the resolution of the plurality of projection devices and the corresponding overlapping proportion according to the sequence of the layout positions; and
setting, by the processing device, a start coordinate of the overlap region as a start coordinate of a next adjacent sub-projection picture.
14. The projection splicing method of claim 11, wherein the step of cutting the original image frame according to the resolutions of the original image frame and the combined projection frame and the start coordinates of the plurality of sub-projection frames further comprises:
and the processing device acquires the projection content of each sub-projection picture corresponding to the original image picture according to the product of the ratio of the initial coordinates of the sub-projection pictures in the combined projection picture to the resolution of the combined projection picture and the resolution of the original image picture so as to cut the original image picture.
15. The projection stitching method of claim 11, wherein the resolution of the sliced original image frames is the same as the resolution of the plurality of projection devices, and the adjacent content of the sliced original image frames is overlapped.
16. The projection stitching method of claim 11, wherein the resolution of the sliced original image frames is not the same as the resolution of the plurality of projection devices, and the adjacent content of the sliced original image frames is overlapped.
17. The projection stitching method of claim 11, wherein the resolution of the original image frames is different from the resolution of the plurality of projection devices.
18. The projection stitching method of claim 10, wherein the resolution of each projection device is the same.
19. The projection splicing method according to claim 10, wherein the plurality of overlapping areas are respectively provided in the plurality of adjacent sub-projection pictures, the plurality of overlapping areas have different overlapping ratios, and the difference between the plurality of overlapping ratios is greater than or equal to 10%.
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Application publication date: 20200825 |