JP2014150561A - Portable type image projection apparatus, image projection method, and image projection program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable type image projection apparatus capable of projecting an image proper to an arbitrary projection surface regardless of a projection direction and the irregularities of the projecting surface.SOLUTION: Image projecting means 81 projects an image on the projecting surface. Projected-image photographing means 82 photographs a projected image being the image displayed on the projection surface when the image projecting means 81 projects the image on the projection surface. Correction information generating means 83 generates correction information for correcting an image to be projected on the basis of a mode difference between the image projected by the image projecting means 81 and the projected image photographed by the projecting-image photographing means 82. Converted image generating means 84 generates a converted image by converting the image to be projected, on the basis of the correction information. The correction information generating means 83 generates the correction information on the basis of a mode difference from the image generated in the projected image depending on the direction of projecting the image by the image projecting means 81 or the mode of the projection surface. The image projecting means 81 projects the converted image on the projecting surface.

Description

  The present invention relates to a portable image projecting apparatus, an image projecting method, and an image projecting program that project an image on an arbitrary place.

  In the present age of the ubiquitous society, a display function of a mobile terminal is required to display a beautiful image and a variety of information anytime and anywhere. Furthermore, the display function of a portable terminal is also required to display such information on a large screen and a highly accurate display. Therefore, as a display function of the mobile terminal, there is an increasing need for not only displaying on a flat display such as liquid crystal or organic EL (Electro-Luminescence) but also using a projection projector.

  Patent Document 1 describes a portable imaging display device that performs image adjustment of a display image in accordance with a ground surface on which the display image is projected. In the portable imaging display device described in Patent Literature 1, the projection display unit projects a display image on the projection plane using the same optical path as when imaging using a half mirror. Then, the projection display unit projects the initial image and captures it with the imaging unit, thereby acquiring the captured image. When the screen imaging determination unit compares the initial image and the captured image and detects the color difference between them, the complementary color data generation unit generates the complementary color data as a correction signal from the detected color difference. The corrected image calculation unit transmits display data obtained by superimposing the display image and the correction signal to the display signal processing unit of the projection display unit so that the display image has a correct color tone when projected onto the projection plane.

Japanese Patent Laying-Open No. 2008-67080 (paragraph 0016, FIG. 1)

  In many cases, a projector displays an image on a specific screen provided in advance or on a white plane portion having a certain area. However, when a portable terminal that is supposed to be carried displays information such as an image, there is not necessarily a white flat part having a screen or a certain area. Therefore, although it has portability, it had to use it, selecting the place to project.

  The portable imaging display device described in Patent Literature 1 generates complementary color data even when the projection surface is not white, thereby converting the display image projected on the projection surface into a correct color. However, if the display image is distorted due to unevenness on the projection surface or projection from an oblique direction, there is a problem that the image cannot be displayed correctly only by color correction.

  Therefore, an object of the present invention is to provide a portable image projection apparatus, an image projection method, and an image projection program capable of projecting an image suitable for an arbitrary projection plane regardless of the projection direction and the unevenness of the projection plane.

  A portable image projection apparatus according to the present invention captures a projection image, which is an image appearing on a projection plane, when the image projection unit projects an image on the projection plane. Correction information generation for generating correction information for correcting an image to be projected based on the difference between the projection image shooting unit, the image projected by the image projection unit, and the projection image shot by the projection image shooting unit Means and a converted image generating means for generating a converted image obtained by converting an image to be projected based on the correction information, the correction information generating means depending on the direction in which the image projecting means projects the image or the aspect of the projection surface Correction information is generated on the basis of the difference in form from the image generated in the projection image, and the image projecting means projects the converted image onto the projection plane.

  The image projection method according to the present invention projects an image on a projection plane, and when the image is projected on the projection plane, captures a projection image that is an image appearing on the projection plane, depending on the direction in which the image is projected, or the projection The correction information is generated based on the difference between the image generated in the projection image due to the surface mode, the converted image is generated based on the correction information, and the converted image is projected onto the projection surface. It is characterized by doing.

  An image projection program according to the present invention captures a projection image, which is an image appearing on a projection plane, when the image is projected onto the projection plane by image projection processing and image projection processing on the computer. Projection image shooting processing, correction information generation processing for generating correction information for correcting the projected image based on the difference between the image projected by the image projection processing and the projection image shot by the projection image shooting processing And a converted image generation process for generating a converted image obtained by converting an image to be projected based on the correction information. In the correction information generation process, the image is projected into the projected image according to the direction in which the image is projected or according to the aspect of the projection plane. Correction information is generated based on a difference in form with the generated image, and a converted image is projected onto a projection plane by image projection processing.

  According to the present invention, it is possible to project an image suitable for an arbitrary projection plane regardless of the projection direction and the unevenness of the projection plane.

It is a block diagram which shows the example of the portable image projector in the 1st Embodiment of this invention. It is a flowchart which shows the example of a process until converting a display image and displaying on a projection surface. It is a block diagram which shows the example of the portable image projector in the 2nd Embodiment of this invention. It is explanatory drawing which shows the example at the time of projecting a display image on the projection surface which has an unevenness | corrugation. It is explanatory drawing which shows the example at the time of projecting a display image on a projection surface from the diagonal direction. It is a flowchart which shows the example of a process until converting a display image and displaying on a projection surface. It is a block diagram which shows the minimum structure of the portable image projector in this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1. FIG.
FIG. 1 is a block diagram showing an example of a portable image projector according to the first embodiment of the present invention. The portable image projector in the present embodiment includes a storage unit 10, a control unit 20, a projector 30, and a camera 40. Note that the portable image projector includes a CPU, an input device (not shown) for giving instructions to the CPU, an acoustic device and the like (not shown), but the description thereof is omitted here.

  The storage unit 10 is a storage device that stores an image (hereinafter referred to as a display image) to be displayed on a region (hereinafter referred to as a projection plane) such as a wall surface or a screen.

  The projector 30 projects a display image stored in the storage unit 10 or a display image converted by the control unit 20 (hereinafter referred to as a converted image) on a projection surface in accordance with an instruction from the control unit 20 and displays the display image. Device. The projector 30 may be built in the portable imaging display device. Alternatively, the projector 30 may be provided separately from the portable imaging display device and connected to the portable imaging display device by wire or wirelessly.

  The camera 40 captures the background color of the projection surface. The base of the projection surface may include a non-uniform color portion (a color changing portion) or other objects such as a wall hanging. In the following description, a case will be described in which the camera 40 captures the background of the projection plane and the control unit 20 recognizes the aspect of the projection plane. Here, the aspect of the projection plane may include not only the color of the base of the projection plane but also the shape of the projection plane. As long as the control unit 20 can recognize the aspect of the projection surface, the camera 40 may have another form. For example, instead of the camera 40, a color sensor that can detect the color of the projection surface or an optical sensor that can detect the luminance may be used.

  The control unit 20 controls an image or video projected on the projection plane. In the following description, the case where the control unit 20 controls an image will be described, but the control target may be a video. The control unit 20 includes an image recognition unit 21, an image conversion unit 22, an image composition unit 23, and an output instruction unit 24.

  The image recognition unit 21 acquires an image captured by the camera 40. In the following description, the case where the image recognition unit 21 acquires an image of the background of the projection surface as an image will be described.

  The image conversion unit 22 generates information (hereinafter referred to as correction information) for correcting the display image to be projected based on the image acquired by the image recognition unit 21. Specifically, when the projection surface is not a white surface, the image conversion unit 22 generates, as correction information, an image obtained by converting the background image of the projection surface into a color having a complementary color relationship (hereinafter referred to as a complementary color image). . This is because it uses the characteristics of light that becomes white when colors that are complementary colors are superimposed, and by displaying the complementary color image superimposed on the display image, it can be displayed in the color that it originally wanted to display. is there.

  The image composition unit 23 converts the display image based on the correction information generated by the image conversion unit 22 to generate a converted image. For example, when the projection surface is not a white surface, the image composition unit 23 generates a converted image by superimposing the generated complementary color image on the display image.

  The output instruction unit 24 instructs the projector 30 to output the converted image created by the image composition unit 23.

  The control unit 20 (more specifically, the image recognition unit 21, the image conversion unit 22, the image composition unit 23, and the output instruction unit 24) is realized by a CPU of a computer that operates according to a program (image projection program), for example. The For example, the program is stored in the storage unit 10, and the CPU reads the program, and the control unit 20 (more specifically, the image recognition unit 21, the image conversion unit 22, the image composition unit 23, and the output instruction according to the program) Part 24).

  Next, the operation will be described. FIG. 2 is a flowchart illustrating an example of processing until a display image is converted and displayed on the projection plane. For example, in response to a user instruction, the camera 40 captures the background of the projection surface (step S51). The image recognition unit 21 acquires an image of the projection plane (here, the background of the projection plane) captured by the camera 40 (step S52). When the image recognition unit 21 acquires the image of the projection plane, the image conversion unit 22 generates correction information for correcting the image to be projected based on the image (step S53). The image composition unit 23 converts the display image based on the correction information generated by the image conversion unit 22 to generate a converted image (step S54). The output instruction unit 24 instructs the projector 30 to output the converted image created by the image composition unit 23 (step S55). Note that when the background of the projection surface changes, the processing may be performed again from step S51.

  According to the present invention, the camera 40 captures an image of the background of the projection surface. The image conversion unit 22 generates a complementary color image based on the background image of the projection plane acquired by the image recognition unit 21. The projector 30 projects the converted image generated by the image composition unit 23 based on the complementary color image onto the projection surface. Therefore, it is possible to correctly display the display image without providing a white surface having a certain area.

Embodiment 2. FIG.
FIG. 3 is a block diagram showing an example of a portable image projector according to the second embodiment of the present invention. In addition, about the structure similar to 1st Embodiment, the code | symbol same as FIG. 1 is attached | subjected and description is abbreviate | omitted. The portable image projector in the present embodiment includes a storage unit 10, a control unit 20 ′, a projector 30, and a camera 40. The configurations of the storage unit 10, the projector 30, and the camera 40 are the same as those in the first embodiment.

  The camera 40 captures an image projected on the projection plane by the projector 30 (hereinafter referred to as a projected image). That is, the projection image can be said to be an image in which the display image or the converted image is changed depending on the aspect of the projection surface.

  The control unit 20 ′ includes an image recognition unit 21, an image synthesis unit 23, an output instruction unit 24, an image comparison unit 25, and an image correction unit 26.

  The image recognition unit 21 acquires an image captured by the camera 40. In the following description, a case where the image recognition unit 21 acquires a projection image as an image will be described.

  The output instruction unit 24 instructs the projector 30 to output the display image stored in the storage unit 10 and the converted image created by the image composition unit 23.

  The image comparison unit 25 calculates the difference in the aspect from the display image based on the projection image acquired by the image recognition unit 21. Examples of the mode difference include a difference in image color and luminance, but the mode difference is not limited to color and luminance. In order to calculate the aspect difference, the image comparison unit 25 first generates an image (hereinafter referred to as a divided display image) obtained by dividing the display image in the vertical direction and the horizontal direction at predetermined division numbers and intervals. Next, the image comparison unit 25 divides the display image so that the number of divisions is the same as the number of divisions of the display image, and the division intervals are the same as the division intervals of the projection images (hereinafter, divided projection images). .) Is generated. The image comparison unit 25 compares the aspect of the divided display image and the corresponding divided projection image to calculate a difference.

  A method for calculating the difference will be described in detail below with reference to the drawings. FIG. 4 is an explanatory diagram showing an example when a display image is projected onto a projection surface having projections and depressions (that is, when the projection surfaces are different in distance). When the projector 30 projects the display image B1 onto the projection plane W1, the projection image D1 is projected onto the projection plane W1. When the camera 40 captures the projection image D1, the image recognition unit 21 acquires the projection image D1. The image comparison unit 25 then sets the display image B1 to a predetermined number of divisions (here, 2) and a predetermined interval (here, equal intervals) in the vertical and horizontal directions. A divided divided display image is generated. Next, the image comparison unit 25 generates a divided projection image obtained by dividing the projection image D1 at equal intervals by dividing the display image B1 by two.

  The image comparison unit 25 compares the aspect of the divided display image and the corresponding divided projection image to calculate a difference. In the example shown in FIG. 4, (x1, y1) and (x1 ′, y1 ′), (x1, y2), (x1 ′, y2 ′), and the like correspond to each other, and the distance to the projection plane projected by the projector 30 is as follows. It shows that the aspect of the projection image D1 is different depending on the difference. At this time, the image comparison unit 25 may recognize the difference in luminance between the two and calculate the difference. Alternatively, the image comparison unit 25 may calculate the difference by recognizing the difference between the two colors.

  FIG. 5 is an explanatory diagram illustrating an example when a display image is projected onto the projection plane from an oblique direction. When the projector 30 projects the display image B2 on the projection plane W2 from an oblique direction, the projection image D2 is displayed on the projection plane W2. Similar to the example illustrated in FIG. 4, the image comparison unit 25 generates an image obtained by dividing the display image B <b> 2 and the projection image D <b> 2 by two in the vertical and horizontal directions.

  In the example shown in FIG. 5, (x3, y3) and (x3 ′, y3 ′), (x3, y4), (x3 ′, y4 ′), and the like correspond to each other. In addition, the projector 30 projects from an oblique direction, which indicates that the projected image D2 is distorted. The image comparison unit 25 recognizes the distortion and calculates the difference. For example, the image comparison unit 25 may recognize the distortion when the vertical / horizontal ratio of the divided display image is different from the vertical / horizontal ratio of the divided projection image. When recognizing the distortion, the image comparison unit 25 acquires points (hereinafter referred to as feature points) for recognizing the position of an object displayed on the image from the image. At this time, the image comparison unit 25 may calculate a difference by recognizing a difference in the manner of corresponding points (for example, P1 and P1 ', P2 and P2') (for example, a difference in luminance, color, and the like).

  In the above description, when the image comparison unit 25 calculates the difference, the display image and the projection image are divided and compared. However, if the difference between the display image and the projection image can be calculated, The difference calculation method is not limited to the above method. Further, the number of points at which the display image and the projection image are divided is not limited to two, and the division interval is not limited to an equal interval. In the above description, the case where the difference is calculated by recognizing the distortion when the vertical / horizontal ratio of the divided display image is different from the vertical / horizontal ratio of the divided projection image is described as an example. The method is not limited to the above method as long as the distortion of two images can be recognized. In this way, even when the projected image is distorted with the display image, the projected image can be correctly recognized.

  The image correction unit 26 generates correction information for correcting the display image to be projected based on the difference in the aspect calculated by the image comparison unit 25. For example, in the example illustrated in FIG. 4, when the image comparison unit 25 calculates that the luminance at the position indicated by the divided display image (x1, y1) is darker by the difference d1 than the luminance at the position indicated by the image (x1, y2). The image correction unit 26 may generate correction information that brightens the color for displaying the position by d1. Alternatively, in the example shown in FIG. 5, the color C1 of the feature point P1 of the image indicated by the divided display image (x3, y3) is the color C2 of the feature point P1 of the image indicated by the divided projection image (x3 ′, y3 ′). When the image comparison unit 25 calculates that the pixel value is different by d2, the image correction unit 26 may generate correction information for changing the pixel value for displaying the position by d2.

  As described above, the image comparison unit 25 recognizes the difference (intensity difference or color difference) between the display image and the display image generated in the projection image due to the aspect (unevenness) of the projection surface, and the image correction unit 26 receives the correction information. Generate. Further, the image comparison unit 25 recognizes the difference (distortion) in the aspect from the display image generated by the direction in which the projector 30 projects the display image (for example, the oblique direction), and the image correction unit 26 generates correction information.

  In the above description, the case where the image correction unit 26 generates the correction information based on the difference in luminance and the color between the display image and the projection image as the difference between the image modes has been described. The method of generating is not limited to the above method.

  The image composition unit 23 converts the display image based on the correction information generated by the image conversion unit 22 to generate a converted image. For example, if the image is displayed with different brightness and color, the image composition unit 23 may generate an image obtained by converting the brightness and color of the display image. Even if the projected image is distorted, the image composition unit 23 may convert the display image based on the correction information generated according to the distortion to generate a converted image.

  When the display image is displayed at a place other than the white plane portion, the display image may not be displayed correctly depending on the aspect of the projection plane. In addition, when a display image is projected perpendicularly to an uneven projection surface, or when a display image is projected from an oblique direction, the image may be displayed distorted. However, by generating and displaying the converted image in this way, an image suitable for an arbitrary projection plane can be projected regardless of the projection direction and the projection surface unevenness. In addition, the display image can be correctly displayed without providing a white plane portion having a certain area. For this reason, it is possible to project an image or video from the projector to an arbitrary place without having to provide a specific screen or select a projection place.

  The control unit 20 ′ (more specifically, the image recognition unit 21, the image synthesis unit 23, the output instruction unit 24, the image comparison unit 25, and the image correction unit 26) operates according to a program (image projection program), for example. This is realized by the CPU of the computer. For example, the program is stored in the storage unit 10, and the CPU reads the program and controls the control unit 20 ′ (more specifically, the image recognition unit 21, the image composition unit 23, the output instruction unit 24, and the image comparison unit 25 according to the program. And the image correction unit 26).

  Next, the operation will be described. FIG. 6 is a flowchart showing an example of processing until a display image is converted and displayed on the projection plane. For example, in response to a user instruction, the output instruction unit 24 instructs the projector 30 to display the display image stored in the storage unit 21 on the projection surface (step S61). After the projection image is displayed, the camera 40 captures the projection image, for example, in accordance with a user instruction or after a predetermined time has elapsed (step S62). The image recognition unit 21 acquires a projection image (captured image D3) captured by the camera 40 (step S63). Then, the image comparison unit 25 determines the mode of the image based on the luminance and color at the position of the feature point of the captured image D3, and calculates the difference between the display image and the mode (step S64). When the image comparison unit 25 calculates the difference, the image correction unit 26 generates correction information for correcting the projected image based on the difference (step S65). The image composition unit 23 converts the display image based on the correction information generated by the image correction unit 26 to generate a converted image (step S66). The output instruction unit 24 instructs the projector 30 to output the converted image created by the image composition unit 23 (step S67). Thereafter, the image composition unit 23 converts the display image based on the correction information, and the output processing unit 24 repeats an instruction to output the converted image to the projector 30. Hereinafter, these processes repeated by the image composition unit 23 and the output processing unit 24 are collectively referred to as a converted image output process.

  Note that the image composition unit 23 and the output processing unit 24 may always perform the converted image output process, or at predetermined intervals (that is, at regular intervals among the processes that are always performed). (Thinning out) may be carried out. The image composition unit 23 and the output processing unit 24 perform the converted image output process at predetermined intervals, thereby reducing the power consumption used in the converted image output process. When the projector 30 displays an image, the image is usually updated at an interval of the frame frequency for each screen. Therefore, even if the converted image output process is performed at a frame frequency or higher, it is not reflected in the image displayed on the projection plane. Therefore, when the image composition unit 23 and the output processing unit 24 perform the converted image output process, it is desirable to perform the process in synchronization with the frame frequency of the projector 30.

  In step S62, after a predetermined time elapses, a projection image may be taken periodically, and the processes after step S63 may be performed. In this case, even when the background of the projection surface changes, the display image can be converted following the change. Alternatively, when the image recognition unit 21 acquires an image captured by the camera 40, the image recognition unit 21 may store the acquired image in the storage unit 10 and compare it with an image captured later by the camera 40. Then, when the image recognition unit 21 determines that there is a difference between the images, the control unit 20 may perform the processes after step S64. By doing so, it is possible to convert the display image in accordance with the change in the background of the projection surface.

  After the converted image is projected onto the projection surface, the correction information may be generated again to perform conversion. The operation in this case will be described. First, the output instruction unit 24 instructs the projector 30 to display the converted image on the projection plane. After the projection image obtained by projecting the converted image is displayed on the projection plane, the camera 40 captures the projection image. The image recognition unit 21 acquires a projection image (captured image) captured by the camera 40. And the image comparison part 25 judges the aspect of a picked-up image, and calculates the difference of a display image and an aspect. When the image comparison unit 25 calculates the difference, the image correction unit 26 generates correction information (hereinafter referred to as recorrection information) for further correcting the converted image projected based on the difference. The image composition unit 23 generates an image (hereinafter referred to as a reconverted image) obtained by further converting the converted image based on the recorrection information generated by the image correcting unit 26. The output instruction unit 24 instructs the projector 30 to output the reconverted image generated by the image composition unit 23. Thereafter, the image composition unit 23 converts the display image based on the correction information and the recorrection information, and the output processing unit 24 repeats an instruction for causing the projector 30 to output the converted image or the reconverted image. By repeating such processing, an image can be appropriately displayed even if the background of the projection surface changes.

  According to the present invention, the projector 30 projects a display image on the projection plane, and the camera 40 captures the projection image displayed on the projection plane. The image comparison unit 25 compares the display image generated in the projection image with the direction in which the projector 30 projects the display image or the form of the projection surface with the original display image. The image correction unit 26 generates correction information based on the difference between the compared modes. The projector 30 projects the converted image generated by the image composition unit 23 on the projection plane based on the correction information. Therefore, an image suitable for an arbitrary projection plane can be projected regardless of the projection direction and the unevenness of the projection plane. In other words, the display image can be displayed correctly without providing a white flat portion having a certain area, so that it is not necessary to provide a specific screen or select a projection location, and the image from the projector can be placed at an arbitrary location. And can project images.

  FIG. 7 is a block diagram showing the minimum configuration of the portable image projector according to the present invention. The portable image projection apparatus according to the present invention includes an image projection unit 81 (for example, the output instruction unit 24 and the projector 30) that projects an image (for example, a display image or a converted image) on the projection plane, and the image projection unit 81 includes the projection plane. When an image is projected onto the projection surface, a projected image photographing means 82 (for example, camera 40) that captures a projected image that is an image appearing on the projection plane, and an image projected by the image projecting means 81 (for example, a display image or A correction information generation unit 83 (for example, the image conversion unit 22) that generates correction information for correcting an image to be projected based on the difference in form between the converted image) and the projection image captured by the projection image capturing unit 82. Alternatively, the image comparison unit 25 and the image correction unit 26) and converted image generation means 84 (for example, image synthesis) that generates a converted image obtained by converting an image to be projected based on the correction information. 23) and a.

  The correction information generation unit 83 has a mode difference (for example, a luminance difference or a color difference) from the image generated in the projection image depending on the direction in which the image projection unit 81 projects the image or the mode of the projection plane. And correction information is generated. The image projecting unit 81 projects the converted image on the projection surface.

  With such a configuration, an image suitable for an arbitrary projection plane can be projected regardless of the projection direction and the unevenness of the projection plane. In other words, the display image can be displayed correctly without providing a white flat portion having a certain area, so that it is not necessary to provide a specific screen or select a projection location, and the image from the projector can be placed at an arbitrary location. And can project images.

  In the above-described embodiment, a divided image generating unit (for example, a divided display image) that generates a divided image (for example, a divided display image) obtained by dividing the image projected by the image projecting unit in the vertical direction and the horizontal direction at predetermined division numbers and intervals. For example, the image comparison unit 25) and a divided projection image generation unit that generates a divided projection image by dividing the projection image so that the number of divisions is the same as the number of divisions. For example, a configuration is disclosed in which the correction information generation unit 83 includes the image comparison unit 25) and generates correction information based on the difference in the mode between the divided image and the corresponding divided projection image.

  In this way, even when the projection image is distorted with the display image, the display image can be correctly displayed.

  Further, the correction information generation unit 83 may generate correction information in synchronization with the frame frequency. In this case, power consumption used in the converted image output process can be suppressed.

  Further, the correction information generation unit 83 may generate correction information based on a luminance difference or a color difference.

  Further, even if the correction information generation unit 83 generates correction information for correcting the converted image based on the difference between the image projected by the image projection unit 81 (for example, the converted image) and the projected image. Good.

  The present invention is preferably applied to a portable image projector that projects an image on an arbitrary place.

DESCRIPTION OF SYMBOLS 10 Memory | storage part 20,20 'Control part 21 Image recognition part 22 Image conversion part 23 Image composition part 24 Output instruction | indication part 25 Image comparison part 26 Image correction part 30 Projector 40 Camera B1, B2 Display image D1, D2 Projection image D3 Captured image W1, W2 Projection plane P1, P2 Feature points

Claims (9)

Image projection means for projecting an image onto a projection surface;
A projection image photographing means for photographing a projection image which is an image appearing on the projection plane when the image projection means projects an image on the projection plane;
Correction information generating means for generating correction information for correcting an image to be projected based on the difference between the image projected by the image projecting means and the projected image captured by the projected image capturing means;
A converted image generating means for generating a converted image obtained by converting an image to be projected based on the correction information;
The correction information generation unit generates correction information based on a difference between the image and the image generated in the projection image according to a direction in which the image projection unit projects an image or a projection surface.
The portable image projection apparatus, wherein the image projection unit projects the converted image onto a projection surface. Divided image generation means for generating a divided image obtained by dividing the image projected by the image projection means in the vertical direction and the horizontal direction at predetermined division numbers and intervals;
Divided projection image generation means for generating a divided projection image obtained by dividing the projection image so that each interval to be divided has the same ratio as the interval, the number being the same as the number of divisions;
The portable image projection device according to claim 1, wherein the correction information generation unit generates correction information based on a difference in aspect between the divided image and the corresponding divided projection image. The portable image projection apparatus according to claim 1, wherein the correction information generation unit generates the correction information in synchronization with the frame frequency. The portable image projector according to any one of claims 1 to 3, wherein the correction information generation unit generates correction information based on a difference in luminance or a difference in color. The correction information generation unit generates correction information for correcting the converted image based on the difference between the image projected by the image projection unit and the projection image. 2. A portable image projector according to item 1. Project the image onto the projection surface,
When an image is projected onto the projection surface, a projection image that is an image appearing on the projection surface is captured,
Generate correction information based on the difference between the image and the image generated in the direction of projecting the image or the projection surface.
Generating a converted image obtained by converting an image to be projected based on the correction information;
An image projecting method comprising projecting the converted image onto a projection surface. Generate a divided image obtained by dividing the image to be projected at a predetermined number and interval in the vertical and horizontal directions,
A divided projection image is generated by dividing the projection image so that the number of divisions is the same and each interval to be divided has the same ratio as the interval,
The image projecting method according to claim 6, wherein the correction information is generated based on a difference in form between the divided image and the corresponding divided projected image. On the computer,
Image projection processing for projecting an image onto a projection surface;
A projection image photographing process for photographing a projection image that is an image appearing on the projection plane when an image is projected onto the projection plane in the image projection process;
Correction information generation processing for generating correction information for correcting an image to be projected based on the difference between the image projected by the image projection processing and the projection image captured by the projection image capturing processing; and
Executing converted image generation processing for generating a converted image obtained by converting an image to be projected based on the correction information;
In the correction information generation process, correction information is generated based on the difference between the image and the image generated in the projection image according to the projection direction or the projection plane.
An image projecting program for projecting the converted image onto a projection surface in the image projecting process. On the computer,
A divided image generation process for generating a divided image obtained by dividing the image to be projected by the image projection process in the vertical direction and the horizontal direction at predetermined division numbers and intervals; and
A divided projection image generation process for generating a divided projection image obtained by dividing the projection image so that each interval to be divided has the same ratio as the interval, the number being the same as the number of divisions;
The image projection program according to claim 8, wherein correction information is generated based on a difference in aspect between the divided image and the corresponding divided projection image in the correction information generation processing.

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