Projection system, projection method, and program

Abstract

To make appropriate corrections on an area of a shadow and an area that is not a shadow even when the areas are both present on a projection surface.SOLUTION: A projection system comprises a projection unit that projects an image and a correction unit that corrects the image. The correction unit makes different corrections between a second area that is an area of a shadow on a projection surface and a first area that is an area that is not a shadow.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a projection system, a projection method, and a program. [Background technology]

[0002] Projection mapping is a conventional technique that projects an image onto an object, making it appear as if the object's color and texture are changing in various ways. There is also a known technology for color correction that allows the projected image to appear in the desired color even when the color of the material of the projection surface or the color of the illumination light changes.

[0003] Patent document 1 discloses that the method includes a color conversion generation step that generates a color conversion that matches the color appearance (how colors appear) for each pixel or block of the image projected onto the projection surface based on predetermined first color information and second color information of the image projected onto the projection surface, and a color correction step that performs color correction using the color conversion for each pixel or block of the input image. Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the projection target is a three-dimensional object and there are shadow and non-shadow areas on the projection surface, conventional technology performs color correction uniformly across the entire projection surface, which eliminates the difference between the shadow and non-shadow areas, causing the shadow to disappear and compromising the three-dimensionality and realism of the projection target.

[0005] The present invention has been made in view of the above, and has an object to perform appropriate correction for each area even when there are shadow areas and non-shadow areas on a three-dimensional projection surface. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the present invention provides a projection device comprising a projection unit that projects an image and a correction unit that corrects the image, wherein the correction unit performs different corrections on a second area, which is a shadow area on a projection surface, and a first area, which is a non-shadow area. [Effects of the Invention]

[0007] According to the present invention, even when a three-dimensional projection surface has shadow areas and non-shadow areas, it is possible to perform appropriate correction for each area. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a projection system according to the first embodiment. [Figure 2] FIG. 2 is a diagram showing an example of the arrangement of the projection device and the image capture device. [Figure 3] FIG. 3 is a diagram illustrating an example of the hardware configuration of the projection system. [Figure 4] FIG. 4 is a diagram showing how images are projected onto a plurality of projection surfaces with different colors. [Figure 5] FIG. 5 is a diagram illustrating an example of a projection object according to the first embodiment. [Figure 6] FIG. 6 is a diagram showing how an image is projected onto a three-dimensional projection surface. [Figure 7] FIG. 7 is a diagram illustrating an example of a functional configuration of the correction processing according to the first embodiment. [Figure 8] FIG. 8 is a flowchart illustrating an example of a procedure for the correction process according to the first embodiment. [Figure 9] FIG. 9 is a diagram illustrating an example of a functional configuration of the correction processing according to the second embodiment. [Figure 10] FIG. 10 is a sequence diagram illustrating an example of a procedure of the correction process according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a projection system, a projection method, and a program will be described in detail with reference to the accompanying drawings.

[0010] (First embodiment) 1 is a diagram showing an example of the configuration of a projection system 1 according to this embodiment. The projection system 1 includes an information processing device 10, a projection device 20, and an image capturing device 30, which are connected to each other by wire or wirelessly. The projection system 1 projects an image onto a projection surface 3, which is the surface of a projection target object 2. Here, the image is made up of a plurality of pixels, and each pixel has color information.

[0011] The information processing device 10 is, for example, a notebook PC, a desktop PC, a server, or the like. The information processing device 10 performs image processing such as correcting color information on an image, transmits the processed image to the projection device 20, and issues an instruction to project the image (projection instruction). The projection device 20 is, for example, a projector. The projection device 20 projects the image received from the information processing device 10 onto a projection surface 3. The image capturing device 30 is, for example, a camera or image sensor having an optical sensor such as a CCD (Charge Coupled Device) sensor or a CMOS (Complementary Metal Oxide Semiconductor) sensor. The image capturing device 30 captures an image of the projection surface 3 and transmits the captured image (captured image) to the information processing device 10.

[0012] Fig. 2 is a diagram showing an example of the arrangement of the projection device 20 and the image capturing device 30. In Fig. 1, the projection device 20 and the image capturing device 30 are depicted as being separated from each other, but in this embodiment, as shown in Fig. 2, the projection unit from which the projection device 20 projects an image and the incident unit from which the image is incident on the image capturing device 30 are located at substantially the same position. In other words, the projection device 20 and the image capturing device 30 are located so that the position from which the image is projected and the position from which the image is incident are close to each other.

[0013] Fig. 3 is a diagram showing an example of the hardware configuration of the projection system 1. As shown in Fig. 3, the information processing device 10 is constructed by a computer and includes a CPU 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, a HD (Hard Disk) 104, an HDD (Hard Disk Drive) controller 105, a display 106, an external device connection I / F (Interface) 108, a network I / F 109, a bus line 110, a keyboard 111, a pointing device 112, a DVD-RW (Digital Versatile Disk Rewritable) drive 114, and a media I / F 116.

[0014] 3, the projection device 20 includes a control unit 201, a projection unit 202, an external device connection I / F 203, and a bus line 204. The image capturing device 30 includes a control unit 301, an image capturing unit 302, an external device connection I / F 303, and a bus line 304.

[0015] The CPU 101 controls the overall operation of the information processing device 10. The CPU 101 also executes a correction process according to this embodiment, which will be described later. The ROM 102 stores programs used to drive the CPU 101, such as an IPL (Initial Program Loader). The RAM 103 is used as a work area for the CPU 101. The HD 104 stores various data, such as programs. The HDD controller 105 controls the reading and writing of various data from and to the HD 104 under the control of the CPU 101. The display 106 is a type of display means (display unit) that uses a liquid crystal display or organic EL (Electro Luminescence) display to display various information, such as a cursor, menu, window, text, or image.

[0016] The external device connection I / F 108 is an interface for connecting various external devices. In this case, the external devices include, for example, the projection device 20, the image capturing device 30, a USB memory, a printer, etc. The external device connection I / F 108 also transmits instructions from the information processing device 10 to the projection device 20 and the image capturing device 30, receives captured images from the image capturing device 30, and transmits images processed by the information processing device 10 to the projection device 20.

[0017] The network I / F 109 is an interface for data communication using a communication network. The bus line 110 is an address bus, a data bus, or the like for electrically connecting the components of the information processing device 10 such as the CPU 101.

[0018] The keyboard 111 is a type of input means (input unit) equipped with multiple keys for inputting characters, numbers, various instructions, etc. The pointing device 112 is a type of input means for selecting and executing various instructions, selecting a processing target, moving a cursor, etc., and may be a mouse, touchpad, trackball, joystick, pen tablet, or the like. The display 106 and pointing device 112 may be realized by a touch panel display that integrates these functions.

[0019] The DVD-RW drive 114 controls reading and writing of various data from and to a DVD-RW 113, which is an example of a removable recording medium. Note that the medium is not limited to a DVD-RW, and may be a DVD-R (Digital Versatile Disk Recordable), etc. The media I / F 116 controls reading and writing (storing) of data from and to a recording medium 115, which is a recording medium such as a flash memory.

[0020] The control unit 201 controls the overall operation of the projection device 20. The control unit 201 also receives images transmitted from the information processing device 10, processes instructions from the information processing device 10, and causes the projection unit 202 to project the images. The projection unit 202 projects the images from the projection unit under the control of the control unit 201 onto the projection surface 3. The external device connection I / F 203 transfers images and instructions transmitted from the information processing device 10 to the control unit 201. The bus line 204 is an address bus, a data bus, or the like for electrically connecting the components of the projection device 20.

[0021] The control unit 301 controls the overall operation of the photographing device 30. The control unit 301 also processes instructions from the information processing device 10, causes the photographing unit 302 to photograph, and transmits the photographed image to the information processing device 10 via the external device connection I / F 203. Under the control of the control unit 301, the photographing unit 302 receives light from the subject to be photographed through an incident unit and photographs the subject using an image sensor or the like. The external device connection I / F 303 passes instructions transmitted from the information processing device 10 to the control unit 301. The bus line 304 is an address bus, a data bus, or the like for electrically connecting the components of the photographing device 30.

[0022] FIG. 4 is a diagram showing how images are projected onto multiple projection surfaces of different colors. As shown in FIG. 4, projection surfaces A to D are flat, and the color density has the following relationship: projection surface A < projection surface B < projection surface C < projection surface D. When a conventional projection device 50 projects the same image P onto such projection surfaces A to D, the brightness of the projected image is affected by the difference in color of the projection surfaces, as shown in FIG. 4(a), and follows the relationship: projection surface A > projection surface B > projection surface C > projection surface D. In this example, because projection surface B is the color of the projection surface intended by projection device 50, the projected image has the desired brightness (brightness of image P) on projection surface B, but is brighter than the desired brightness on projection surface A and darker than the desired brightness on projection surfaces C and D.

[0023] Fig. 4(b) shows an example in which conventional color correction processing is performed on image P projected by conventional projection device 50, and the processed image is projected. As in Fig. 4(a), projection surfaces A to D have the following relationship of color intensity before projection: projection surface A < projection surface B < projection surface C < projection surface D. According to conventional color correction, processing using color conversion is performed for each pixel so that the color of the projected image becomes the desired color, and therefore the color of the projected image also becomes the desired color on projection surfaces A, C, and D.

[0024] FIG. 5 is a diagram showing an example of a projection object 2 according to this embodiment. As shown in FIG. 5, the projection object 2 is a three-dimensional object, and a shadow is generated on the left side of the projection surface 3 when light 4, such as illumination light or external light, is irradiated from the right. Note that, although this embodiment shows an example of a dish such as a rice bowl as the projection object 2, the projection object 2 may also be a three-dimensional object other than dishware, such as clothing or a person's face. Furthermore, the light 4 may be any light that generates a shadow on the projection object 2, even without placing a lighting device.

[0025] FIG. 6 illustrates the projection of an image onto a three-dimensional projection surface 3. FIG. 6(a) shows an example in which a projection device 50 projects an image processed using conventional color correction, and FIG. 6(b) shows an example in which a projection system 1 projects an image processed using the correction of this embodiment. In conventional processing, uniform color correction is performed on shadow areas as well as non-shadow areas, so the color of the projected image is the same everywhere on the projection surface 3. As shown in FIG. 6(a), the projected image appears to be the same color as image P, but the shadow on the projection surface 3 is invisible. In contrast, in this embodiment, as described below, the same color correction as in the conventional method is performed on shadow and non-shadow areas, and a correction is performed to reduce the brightness of the shadow area. In other words, the brightness of the shadow area is reduced so that it appears as a shadow. As a result, as shown in FIG. 6(b), areas that had a shadow before projection appear to retain the shadow of the projection surface 3 during projection.

[0026] The correction process according to this embodiment will be described below with reference to Figs. 7 and 8. Fig. 7 is a diagram showing an example of the functional configuration of the correction process according to this embodiment. As shown in Fig. 7, the functional units of the correction process executed by the CPU 101 include an instruction unit 1012, a transmission / reception unit 1014, a discrimination unit 1016, and a correction unit 1018.

[0027] The instruction unit 1012 instructs the image capturing device 30 to capture an image and the projection device 20 to project an image. The transmission / reception unit 1014 receives captured images from the image capturing device 30 and transmits corrected images to the projection device 20.

[0028] The discrimination unit 1016 discriminates between a non-shadow area (first area) and a shadow area (second area) on the projection surface 3 in a captured image acquired from the projection surface 3 when the projection unit 202 is not projecting an image. The discrimination between the first area and the second area is performed by comparing the image of the projection surface 3 without a shadow with the image of the projection surface 3 with a shadow (the projection surface 3 onto which an image is actually projected). Specifically, the discrimination unit 1016 compares the color information of the image of the projection surface 3 without a shadow with the color information of the image of the projection surface 3 with a shadow for each pixel, and determines pixels where the difference in color information is greater than a predetermined threshold and where the brightness is reduced as the second area, and the other pixels as the first area. Here, the predetermined threshold is, for example, a value set in advance in a production factory or the like through experiments. The image of the projection surface 3 without a shadow is, for example, an image acquired by the imaging device 30 of the projection surface 3 illuminated by multiple lights and free of shadows. The image of the projection surface 3 with a shadow is, for example, an image acquired by the imaging device 30 of the projection surface 3 with a shadow when an image is actually projected. Here, it is assumed that the image of the projection surface 3 without a shadow and the image of the projection surface 3 with a shadow are captured with the same composition.

[0029] The correction unit 1018 processes the image using different corrections for the first and second regions determined based on the captured image acquired from the projection surface 3 when the projection unit 202 is not projecting an image. Specifically, the color information of the image in the first region is corrected using conventional color correction so that the color of the projected image becomes the desired color. On the other hand, the color information of the image in the second region is processed using conventional color correction and then corrected to reduce the brightness. For example, the brightness of each pixel of the image in the second region is reduced by the difference in brightness between the color information of the image of the projection surface 3 without a shadow and the color information of the image of the projection surface 3 with a shadow, pixel by pixel. In this way, in the second region, the brightness is corrected to be lower than the brightness of the first region, making the shadow visible in the projected image. Note that the brightness reduction process for the second region may be reduced by a value greater than the difference in brightness. This can enhance the shadow of the projected image, further enhancing the three-dimensionality and realism.

[0030] 8 is a flowchart showing an example of the procedure of the correction process according to this embodiment. First, the instruction unit 1012 instructs the image capturing device 30 to capture an image, and the image capturing device 30 captures an image of the projection surface 3 (step S10). At this time, the image capturing device 30 acquires an image of the projection surface 3 without a shadow and an image of the projection surface 3 with a shadow. These captured images are then transmitted from the image capturing device 30 to the information processing device 10 and received by the transmission / reception unit 1014.

[0031] Next, the discrimination unit 1016 compares the image of the projection surface 3 without a shadow with the image of the projection surface 3 with a shadow, and discriminates between a first region and a second region (step S11). Subsequently, the correction unit 1018 performs conventional color correction on the first region (step S12), performs conventional color correction on the second region (step S13), and further performs correction to make the brightness of the second region lower than the brightness of the first region (step S14). Then, the transmission / reception unit 1014 transmits the corrected image to the projection device 20, and in response to the instruction unit 1012 transmitting a projection instruction to the projection device 20, the projection device 20 projects the corrected image onto the projection surface 3 (step S15).

[0032] In this way, according to this embodiment, by performing different corrections on the second area, which is a shadow area on the projection surface, and the first area, which is a non-shadow area, even when there are shadow areas and non-shadow areas on the projection surface, it is possible to perform appropriate corrections on each area. This makes it possible to visually recognize shadows in the projected image, improving the three-dimensionality and realism of the projection surface.

[0033] (Second embodiment) In this embodiment, an image of the above-described shadow-free projection surface 3 is stored in advance in a recording medium, and is read from the recording medium and used to distinguish the area. In the following description of the second embodiment, explanations of parts that overlap with the first embodiment will be omitted, and only parts that differ from the first embodiment will be described.

[0034] 9 is a diagram showing an example of the functional configuration of the correction processing according to this embodiment. The difference from the first embodiment is that the correction processing functional unit further includes a readout unit 1015, and a discrimination unit 1016 performs discrimination using the image of the projection plane 3 without a shadow read out by the readout unit 1015.

[0035] The reading unit 1015 reads out an image of the shadowless projection surface 3 stored in advance on a recording medium such as the DVD-RW 113 or the recording medium 115, and transmits it to the discrimination unit 1016. The discrimination unit 1016 discriminates between the first area and the second area using color information of the image of the shadowless projection surface 3 read out by the reading unit 1015 and color information of the image of the shadowed projection surface 3 captured by the image capturing device 30. The color information of the image of the shadowless projection surface 3 is an example of pre-stored color information indicating the projection surface 3, and is, for example, color information of an image captured with the same composition as the image of the shadowed projection surface 3 under illumination with multiple lights and no shadows on the projection surface 3.

[0036] 10 is a sequence diagram showing an example of the procedure of the correction process according to this embodiment. First, the instruction unit 1012 of the information processing device 10 receives an operation instruction from the user (step S20) and issues an image capture instruction to the image capture device 30 (step S21). The image capture device 30 captures an image of the shadowed projection surface 3 (step S22) and transmits the captured image to the information processing device 10 (step S23).

[0037] Next, the discrimination unit 1016 reads out an image of the projection surface 3 without a shadow that has been acquired in advance and stored in a recording medium (step S24), and compares the image of the projection surface 3 without a shadow with the captured image (image of the projection surface 3 with a shadow) (step S25).

[0038] Based on the comparison result, the discrimination unit 1016 discriminates between the first region and the second region (step S26). Subsequently, the correction unit 1018 performs conventional color correction on the first region (step S27), performs conventional color correction on the second region (step S28), and further performs correction to make the brightness of the second region lower than the brightness of the first region (step S29). Through these corrections, a corrected image is generated (step S30). Then, the transmission / reception unit 1014 transmits the corrected image to the projection device 20 (step S31), and the instruction unit 1012 transmits a projection instruction to the projection device 20 (step S32). Furthermore, upon receiving the projection instruction, the projection device 20 projects the corrected image onto the projection surface 3 (step S33).

[0039] Instead of actually capturing and storing an image of the shadowless projection surface 3, a three-dimensional model corresponding to the projection surface 3 may be created, and the entire three-dimensional model may be set to the color of the shadowless projection surface 3, which may then be generated as an image of the shadowless projection surface 3 and stored in a recording medium. In this case as well, the image of the shadowless projection surface 3 is generated so as to have the same composition as the image of the shadowed projection surface 3.

[0040] As described above, according to this embodiment, by reading and using a shadow-free image of the projection surface 3 that has been acquired in advance and stored in a recording medium, it is possible to distinguish between the second area, which is a shadow area on the projection surface, and the first area, which is a non-shadow area. Furthermore, by performing different corrections on the first and second areas, even if there are shadow areas and non-shadow areas on the projection surface, it is possible to perform appropriate corrections on each area. This makes it possible to visually recognize shadows in the projected image, improving the three-dimensionality and realism of the projection surface.

[0041] Although the above describes various embodiments of the present invention, the above-described embodiments are presented as examples and are not intended to limit the scope of the invention. For example, the discrimination unit 1016 may discriminate not only two regions (first region and second region) but also three or more regions. To discriminate three regions, the discrimination unit 1016 compares the image of the shadowless projection surface 3 with the captured image pixel by pixel. If the difference in color information of a pixel is greater than a first threshold but less than a second threshold, and the brightness is reduced, the pixel is classified as the second region (a light shadow region). If the difference in color information of a pixel is greater than the second threshold and the brightness is reduced, the pixel is classified as the third region (a dark shadow region). Otherwise, the pixel is classified as the first region (a non-shadow region). In this case, the correction unit 1018 reduces the brightness of the second and third regions. However, the degree of reduction in brightness of the third region (the degree of shadow emphasis) may be greater than the degree of reduction in brightness of the second region to enhance the three-dimensional effect and realism.

[0042] Furthermore, by appropriately combining, integrating, or separating the various pieces of hardware included in the projection system 1, the projection system 1 of each embodiment may be realized with one device, two devices, or three or more devices.

[0043] The programs executed by the information processing device 10 of each of the above-described embodiments are provided as files in an installable or executable format stored on a computer-readable storage medium such as a CD-ROM, a flexible disk (FD), a CD-R, or a DVD (Digital Versatile Disk).

[0044] The program executed by the information processing device 10 of each embodiment may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. The program executed by the information processing device 10 of each embodiment may be provided or distributed via a network such as the Internet.

[0045] The programs of the embodiments may be provided in a state where they are pre-installed in a ROM or the like.

[0046] The program executed by the information processing device 10 of each embodiment has a modular structure including the above-mentioned functional units (instruction unit 1012, transmission / reception unit 1014, discrimination unit 1016, correction unit 1018, etc.), and in terms of actual hardware, the CPU 101 reads and executes the program from the above-mentioned storage medium, thereby loading the above-mentioned units onto the main memory device, and the instruction unit 1012, transmission / reception unit 1014, discrimination unit 1016, correction unit 1018, etc. are generated on the main memory device.

[0047] Furthermore, each function of each of the above-described embodiments can be realized by one or more processing circuits. Here, the term "processing circuit" in this specification includes a processor programmed to execute each function by software, such as a processor implemented by an electronic circuit, as well as devices such as an ASIC, a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and conventional circuit modules designed to execute each of the above-described functions.

[0048] For example, aspects of the present invention are as follows. <1> The projection system comprises a projection unit that projects an image and a correction unit that corrects the image, wherein the correction unit performs different corrections on a second area, which is a shadow area on the projection surface, and a first area, which is a non-shadow area. <2> the correction unit makes the brightness of the second region lower than the brightness of the first region; <1> 2. A projection system according to claim 1. <3> the correction unit corrects the image based on color information of the image and color information of the projection surface; <1> 2. A projection system according to claim 1. <4> the color information of the projection surface is color information acquired from the projection surface when the projection unit is not projecting the image; <3> 2. A projection system according to claim 1. <5> a discrimination unit that discriminates between the first area and the second area based on color information of the projection surface, <3> 2. A projection system according to claim 1. <6> The method further includes: <3> ~ <5> 1. A projection system according to claim 1, wherein: <7> The projection unit and the image capturing unit are arranged so that a position where the projection unit projects an image and a position where the image is incident on the image capturing unit are close to each other. <6> 2. A projection system according to claim 1. <8> The projection system further includes an imaging unit that acquires color information of the projection surface, and a discrimination unit that discriminates between the first area and the second area based on the color information of the projection surface, wherein the discrimination unit discriminates between the first area and the second area based on a difference between color information of the projection surface without a shadow acquired by the imaging unit and color information of the projection surface with a shadow acquired by the imaging unit. <3> ~ <5> 1. A projection system according to claim 1, wherein: <9> The projection system further includes an imaging unit that acquires color information of the projection surface, a discrimination unit that discriminates between the first area and the second area based on the color information of the projection surface, and a readout unit that reads out pre-stored color information that indicates the projection surface without a shadow, wherein the discrimination unit discriminates between the first area and the second area based on a difference between the pre-stored color information and the color information of the projection surface with a shadow that is acquired by the imaging unit. <3> ~ <5> 1. A projection system according to claim 1, wherein: <10> The projection surface is a three-dimensional surface. <1> ~ <9> 1. A projection system according to claim 1, wherein: <11> A projection method executed in a projection system having a projection unit that projects an image, the projection method including a correction step for correcting the image, characterized in that the correction step performs different corrections on a second area, which is a shadow area on the projection surface, and a first area, which is a non-shadow area. [Explanation of symbols]

[0049] 1. Projection System 2. Projection object 3 Projection plane 10. Information processing equipment 20 Projection device 30 Imaging equipment 101 CPU 1012 Instruction section 1014 Transmitter / Receiver 1015 Readout unit 1016 Discrimination part 1018 Correction unit [Prior art documents] [Patent documents]

[0050] [Patent Document 1] Patent No. 4120841

Claims

1. a projection unit that projects an image; a correction unit that corrects the image; Equipped with The correction unit performs different corrections on a second area, which is a shadow area on the projection surface, and a first area, which is a non-shadow area.

2. The correction unit The projection system of claim 1 , wherein the second region has a lower brightness than the first region.

3. The correction unit The projection system according to claim 1 , wherein the image is corrected based on color information of the image and color information of the projection surface.

4. The projection system according to claim 3 , wherein the color information of the projection surface is color information acquired from the projection surface when the projection unit is not projecting the image.

5. The projection system according to claim 3 , further comprising a discrimination unit that discriminates between the first area and the second area based on color information of the projection surface.

6. The projection system according to claim 3 , further comprising an image capturing unit for acquiring color information of the projection surface.

7. The projection system according to claim 6 , wherein the projection unit and the image capture unit are arranged so that a position from which the projection unit projects an image and a position from which the image is incident on the image capture unit are close to each other.

8. an imaging unit that acquires color information of the projection surface; a discrimination unit that discriminates between the first area and the second area based on color information of the projection surface; Furthermore, 4. The projection system according to claim 3, wherein the discrimination unit discriminates between the first area and the second area based on a difference between color information of the projection surface without a shadow acquired by the photographing unit and color information of the projection surface with a shadow acquired by the photographing unit.

9. an imaging unit that acquires color information of the projection surface; a discrimination unit that discriminates between the first area and the second area based on color information of the projection surface; a reading unit that reads pre-stored color information indicating the shadow-free projection surface; Furthermore, The projection system according to claim 3 , wherein the discrimination unit discriminates between the first area and the second area based on a difference between the pre-stored color information and color information of the projection surface with a shadow acquired by the photographing unit.

10. 10. The projection system of claim 1, wherein the projection surface is three-dimensional.

11. 1. A projection method carried out in a projection system having a projection unit that projects an image, comprising: a correction step of correcting the image, The projection method is characterized in that the correction step performs different corrections on a second area, which is a shadow area on the projection surface, and a first area, which is a non-shadow area.

Images