JP2011085660A - Projection device, projection method, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily improve resolution of a projected image. <P>SOLUTION: A zoom control unit 121 controls a zoom magnification of an image to be projected toward a wide end or a tele end. An image processing circuit 112 generates a wide view field image data for projecting an image to the wide end from an inputted image data as well as generates a partial precision image data comprising a part of the region of the wide view field image from the inputted image data. A project microcomputer 115 controls projection in such a manner that the wide view field image at the wide end and the partial precision image in the telephoto end are fast switched and projected by the control of the zoom control unit 121. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection apparatus, a projection method, and a program, and more particularly to a technique suitable for use in improving the resolution of a projection image.

  Conventionally, as a technique for improving the resolution of a projected image by a projector, there is one in which two liquid crystal panels are arranged so that a projected image is shifted by ½ pixel. A technique is known in which two images with different sampling points corresponding to a distance of 1/2 pixel are projected from the respective liquid crystal panels, combined, and displayed on the screen to obtain twice the resolution. (For example, refer to Patent Document 1).

  On the other hand, as a technique for performing high-resolution display on a large screen with a projector, a technique for obtaining a single high-resolution projection image by connecting images projected from a plurality of projectors is also known (for example, Patent Document 2). According to this technique, one image data is decomposed into a plurality of image data that can be displayed by a plurality of projectors, and the images are displayed by being connected by a plurality of separate projectors arranged in the horizontal direction. As a result, high-resolution enlarged display is realized on a large screen so as not to cause image roughness caused by enlargement of pixels.

Japanese Patent Laid-Open No. 5-150208 JP-A-8-50469

  However, the above-described prior art requires a projector including a plurality of projectors and a plurality of liquid crystal panels. Further, when using a plurality of projectors, their installation positions and projection angles are different, so that it is necessary to correct image distortion, brightness, and the like for the projected image. As a result, a plurality of projectors and a liquid crystal panel are required, and a circuit for correcting image distortion, brightness, and the like are required, which increases the cost.

  An object of the present invention is to make it possible to easily improve the resolution of a projected image in view of the above-described problems.

  The projection apparatus according to the present invention controls a projection unit that projects an image, and a zoom magnification of an image projected by the projection unit to a first zoom magnification or a second zoom magnification that is smaller than the first zoom magnification. Zoom control means for generating, a first image generating means for generating a first image for projection at the first zoom magnification from the input image data, and the first image from the input image data. Generated by the first image generating means at the first zoom magnification in accordance with the zoom magnification control by the zoom control means. The projection unit that controls the projection unit to switch and project the first image thus generated and the second image generated by the second image generation unit at the second zoom magnification. And an image control unit.

  According to the present invention, the resolution of a projected image can be easily improved.

It is a block diagram which shows the structural example of the projector which concerns on 1st Embodiment. It is a flowchart which shows an example of the procedure of a partial high resolution process. It is a figure which shows an example of the production | generation method of the data of a wide visual field image and a partial detailed image. It is a figure which shows the actual projection image in 1st Embodiment. It is a block diagram which shows the structural example of the projector which concerns on 2nd Embodiment. It is a flowchart which shows an example of the procedure of a partial high resolution process. It is a figure which shows an example of the setting method of the area | region which performs a high-resolution display. It is a figure which shows an example of the production | generation method of partial detailed image data. It is a flowchart which shows an example of the procedure of a high resolution process. It is a figure which shows the actual projection image in 3rd Embodiment.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a projector 100 according to the present embodiment.
In FIG. 1, the projection lens system 101 includes a lens for projecting an image from the projector 100. The focus lens 102 is for adjusting the focus of the projected image, and the zoom lens 103 is for optically scaling the projected image. Here, the lens position information of the focus lens 102 is detected by the focus encoder 105, and the zoom information of the zoom lens 103 is detected by the zoom encoder 106. The focus lens 102 and the zoom lens 103 are driven by a motor 104.

  The projector microcomputer 115 is for controlling the projection function of the projector 100. Connected to the projector microcomputer 115 are an EEPROM 122 for storing initial data and table data, a temperature sensor 123 for detecting the temperature in the projector 100, and an operation SW 124 for operating the projector 100. Further, a remote control light receiving unit 125 for receiving a signal from the remote control, a fan drive circuit 126 for driving a cooling fan, and an AF sensor 127 are connected. The AF sensor 127 includes a distance measuring sensor that measures the distance to the projection surface and a sensor such as a CCD that detects the contrast of the projected image. The PC interface 128 is an interface such as a USB, and is used for communication between a personal computer (PC) and the projector 100.

  The projector microcomputer 115 functions as a plurality of control units. The image processing unit 116 controls the image processing circuit 112 so as to perform preprocessing, color processing, and the like for performing digital scaling of the image, correction of image distortion, and upside down projection. The external I / O control unit 117 is a control unit for controlling data communication with input devices such as a keyboard and a mouse connected to the projector 100 and output devices such as a printer. The fan / temperature management unit 118 is a control unit for managing the temperature in the projector 100 and cooling the air by the fan. The fan / temperature management unit 118 detects the temperature from the temperature sensor 123 and suppresses the temperature rise in the projector 100. Rotational speed control is performed.

  The SW / remote control unit 119 is a control unit for detecting an operation signal from the operation SW 124 or the remote control light receiving unit 125. The switch operation such as power ON / OFF, auto focus (AF), manual focus (MF), etc. Is detected. The AF control unit 120 is for calculating the driving position of the focus lens 102 based on information from the AF sensor 127 so that the focus of the projected image is in focus. Furthermore, the AF control unit 120 sends a signal to the motor driver 107 to drive the focus lens 102 to the calculated drive position based on the lens position information detected by the focus encoder 105.

  The zoom control unit 121 inputs zoom magnification information from the PC via the operation SW 124, the remote control light receiving unit 125, or the PC interface 128, and the driving position of the zoom lens 103 so that the projected image is projected at the zoom magnification. Is calculated. Further, zoom speed information is input from the operation SW 124, the remote control light receiving unit 125, or from the PC via the PC interface 128. Then, based on the lens position information detected by the zoom encoder 106, a signal is sent to the motor driver 107 to drive the zoom lens 103 to the calculated drive position according to the zoom speed.

  The image signal is input to the projector 100 from the image signal input terminal 114. The input image signal is converted into a digital image signal by the A / D converter 113, and the converted digital image signal is stored in the image processing circuit 112. The image processing circuit 112 temporarily stores a digital image signal, and electrically performs deformation processing such as digital scaling of the image, correction of image distortion, and upside down projection of the image based on control by the projector microcomputer 115. . The image-processed digital image signal is converted into an analog image signal by the D / A converter 111 and supplied to the liquid crystal drive circuit 110.

  The liquid crystal drive circuit 110 is a circuit for outputting an input analog image signal and displaying it on the RGB liquid crystal panels 108. The image displayed on the liquid crystal panel 108 is projected onto the projection surface via the projection lens system 101 disposed on the front surface of the liquid crystal panel 108 by the irradiation light from the lamp 109 disposed on the back surface of the liquid crystal panel 108. . The display size of the projection image is determined from the distance from the AF sensor 127 to the projection plane, the lens position information of the focus lens 102 detected by the focus encoder 105, and the lens position information of the zoom lens 103 detected by the zoom encoder 106. It is determined.

Hereinafter, in the present embodiment, the description will be made assuming that the projection surface has no irregularities and is installed in parallel to the lens surface.
FIG. 2 is a flowchart illustrating an example of a procedure of partial high resolution processing by the projector 100 according to the present embodiment.
In FIG. 2, when image data to be projected is input from the PC to the projector via the image signal input terminal 114, the processing is started. In step S201, the A / D converter 113 converts the input image data into a digital image signal, and the image processing circuit 112 stores the digital image signal converted by the A / D converter 113.

  Next, in step S <b> 202, the projector microcomputer 115 stands by until information on the zoom speed when the zoom lens 103 is moved from the wide end to the tele end is input via the PC interface 128. Here, the zoom speed is 60 Hz or 120 Hz, for example. When 60 Hz information is input, the zoom lens 103 is moved from the wide end to the tele end or from the tele end to the wide end at a speed of 1/60 seconds. I will let you. A known technique is used as a mechanism for driving the zoom at high speed. For example, the lens may be driven by controlling the USM at a high speed, or a dynamorph lens that controls the liquid of the liquid lens with a laminated piezo element and changes the focal length may be used.

  When the zoom speed information is input, in step S203, the zoom control unit 121 moves the zoom lens 103 to the wide end according to the input zoom speed information. In step S204, the AF control unit 120 performs AF control to focus the projected image. In step S205, the image processing unit 116 performs a scaling process on the input image data, and an image processing circuit that functions as a first image generation unit to generate wide-field image data projected at the wide end. 112 is controlled. And it outputs to the D / A converter 111. A detailed procedure for generating wide-field image data will be described later.

  Next, in step S206, the D / A converter 111 converts the wide-field image data generated in step S205 into an analog image signal, and the liquid crystal drive circuit 110 outputs the analog image signal to the liquid crystal panel 108. . Then, under the control of the projector microcomputer 115, the liquid crystal drive circuit 110 projects an image on the projection surface via the projection lens system 101 by the irradiation light from the lamp 109.

  Next, in step S207, the zoom control unit 121 moves the zoom lens 103 to the tele end in accordance with the zoom speed information input in step S202. In step S208, as in step S204, the AF control unit 120 performs AF control to focus the projected image. Next, in step S209, the image processing unit 116 performs a scaling process on the input image data, and performs image processing that functions as a second image generation unit so as to generate partial detailed image data projected at the tele end. The circuit 112 is controlled. A detailed procedure for generating the partial detailed image data will be described later.

  Next, in step S210, the D / A converter 111 converts the partial detailed image data generated in step S209 into an analog image signal, and the liquid crystal drive circuit 110 outputs the analog image signal to the liquid crystal panel 108. . Then, under the control of the projector microcomputer 115, the liquid crystal drive circuit 110 projects an image on the projection surface via the projection lens system 101 by the irradiation light from the lamp 109. In step S211, the projector microcomputer 115 determines whether or not to end the image projection. If projection is continued as a result of this determination, the process returns to step S203. On the other hand, if the result of determination in step S211 is that projection is to end, the processing ends. As described above, the projector microcomputer 115 functions as a projection image control unit, so that the processing is repeated.

  Next, details of the wide-field image data and the partial detailed image data and the generation method thereof will be described with reference to FIG. FIG. 3 is a diagram illustrating an example of a method for generating a wide-field image and a partial detail image. Here, the resolution that can be expressed by the projector 100 is the width Wp pixel and the height Hp pixel, and the input image data 301 input from the image signal input terminal 114 is the number of pixels of the width Wo pixel and the height Ho pixel. It is assumed that the image data is configured.

  The wide-field image data 303 is image data composed of the number of pixels of a width Wp pixel and a height Hp pixel, like the resolution that can be expressed by the projector 100, and the input image data 301 is subjected to a scaling process. Is generated. For this scaling process, a known method such as the nearest neighbor method or the bilinear method is used.

  On the other hand, the partial detailed image data 304 is also image data composed of the number of pixels of a width Wp pixel and a height Hp pixel, like the resolution that can be expressed by the projector 100. However, the partial detailed image data 304 is generated by performing region segmentation processing on the input image data 301 and performing scaling processing on the region image 302 segmented into a partial region. A known method such as a nearest neighbor method or a bilinear method is used for the scaling process. Further, the area to be cut out is determined by calculation from the ratio between the display size of the projection image at the wide end and the display size of the projection image at the tele end. As described above, the display size of the projection image is determined from the distance to the projection plane obtained from the AF sensor 127 and lens information.

  FIG. 4 is a diagram showing an actual projection image in the present embodiment. FIG. 4A shows a projection image when the zoom lens 103 is at the wide end. When the zoom lens 103 is at the wide end as the first zoom magnification, wide-field image data is used as the projection image. FIG. 4B shows a projection image when the zoom lens 103 is at the tele end. When the zoom lens 103 is at the tele end as the second zoom magnification, partial detailed image data is used as the projection image. In the present embodiment, under the control of the projector microcomputer 115, the projection in the two states of the wide end and the tele end is performed while switching according to the zoom speed, so that the composite as shown in FIG. Project a projected image. By making this zoom speed sufficiently high, for example, 120 Hz, the synthesized projected image can be displayed as a single image with improved resolution only in the area of the image projecting the partial detailed image. .

  As described above, according to the present embodiment, the resolution that exceeds the display resolution of the projector is used for a partial region of the projected image without using complicated image correction and using an existing optical system with one projector. Can display a projected image.

  In the present embodiment, the process of switching between the projection image when the zoom lens 103 is at the wide end and the projection image when the zoom lens 103 is at the tele end has been described, but it is not always necessary to be at the wide end and the tele end. At two lens positions where the position of the zoom lens 103 is different, the image data to be projected is generated according to the display size of the projected image at each lens position at that time, and the resolution is also improved by projecting while switching between them Can be made. In the present embodiment, the process returns from step S211 to step S203 to repeatedly project two images. On the other hand, when displaying a still image, since wide-field image data and partial detailed image data have already been generated, these image data are stored in a memory or the like, and these image data are newly generated. Processing may be omitted.

(Second Embodiment)
In the present embodiment, a process will be described in which the projector 100 described in the first embodiment further includes a shift lens and improves the resolution at an arbitrary place in the projected image.
FIG. 5 is a block diagram illustrating a configuration example of the projector 500 according to the present embodiment. The projector 500 according to the present embodiment has a shift lens 501 for adjusting the projection angle and a shift encoder 502 for detecting lens position information of the shift lens 501 in the basic configuration of the projector 100 described in the first embodiment. And are included. The projector microcomputer 504 also functions as a shift control unit 503 and controls the position of the shift lens 501 based on the lens position information detected by the shift encoder 502. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

FIG. 6 is a flowchart showing an example of a procedure of partial high resolution processing by the projector 100 according to the present embodiment. Note that step S201, step S203 to step S208, and step S211 are the same as the process described with reference to FIG.
In step S <b> 601, the projector microcomputer 504 is configured to input zoom speed and high resolution display area information when moving the zoom lens 103 from the wide end to the tele end via the PC interface 128. stand by. Here, the information on the area where the high-resolution display is performed is information indicating which area in the projection image is displayed at a high resolution. Details of the setting method of this area will be described later.

  In step S602, the shift control unit 503 controls the shift lens 501 to move it to the neutral position. Here, the neutral position is a lens position that does not bend the optical axis of the light that has passed through the focus lens 102. Further, in step S603, the shift control unit 503 determines the movement position of the shift lens 501 based on the input region information for performing high resolution display, and moves the shift lens 501 to that position. In step S604, the image processing unit 116 performs a scaling process on the input image data based on the area information on which high resolution display is performed, and generates partial detailed image data projected at the tele end. The image processing circuit 112 is controlled. A detailed procedure for generating the partial detailed image data will be described later.

  Next, in step S <b> 605, the image processing unit 116 acquires information on the shift amount of the shift lens 501 from the shift encoder 502. Then, based on the shift amount, the image processing circuit 112 is controlled so as to perform image distortion correction on the partial detailed image data generated in step S604. A known method is used for distortion correction. The D / A converter 111 converts the corrected partial detailed image data into an analog image signal, and the liquid crystal drive circuit 110 outputs the analog image signal to the liquid crystal panel 108. Then, under the control of the projector microcomputer 115, the liquid crystal drive circuit 110 projects an image on the projection surface via the projection lens system 101 by the irradiation light from the lamp 109.

  FIG. 7 is a diagram illustrating an example of a method for setting an area for performing the above-described high-resolution display. In step S601 in FIG. 6, the example in which the information on the area for performing the high resolution display is input from the PC has been described. However, the information on the area for performing the high resolution display may be generated on the projector 500 side. In this case, the area is set by the method shown in FIG. 7A or 7B.

  In the example shown in FIG. 7A, the face area of a person is detected by a known face recognition technique by the projector microcomputer 504 for the image data input from the image signal input terminal 114. Then, the projector microcomputer 504 sets the detected face area as a high resolution display area. On the other hand, in the example illustrated in FIG. 7B, the viewpoint position is detected by the projector microcomputer 504 using a known line-of-sight tracking technique with respect to the image data input from the image signal input terminal 114. Then, the projector microcomputer 504 sets it as a high-resolution display area corresponding to the area centered there. Note that the method for setting the high-resolution display area is not limited to these, and for example, the user may specify an arbitrary area via the PC, or another method may be used.

FIG. 8 is a diagram illustrating an example of a method for generating partial detailed image data according to the present embodiment.
In FIG. 8, the partial detailed image data 803 is image data composed of the number of pixels of width Wp pixels and height Hp pixels, similarly to the resolution that can be expressed by the projector 500. The partial detailed image data 803 is generated by performing area extraction processing on the input image data 801 and scaling processing on the extracted area image 802. A known method such as a nearest neighbor method or a bilinear method is used for the scaling process.

  Further, the area to be cut out is determined by calculation from the ratio between the display size of the projection image at the wide end and the display size of the projection image at the tele end so as to include the high-resolution display area 804 shown in FIG. The As described above, the display size of the projection image is determined from the distance to the projection plane obtained from the AF sensor 127 and lens information. If the high resolution display area 804 is larger than the area size obtained from the display size ratio of the projection image, an area obtained from the ratio of the display size of the projection image is set in the center of the high resolution display area 804. Then, the cutout process may be performed. Note that the method for generating the wide-field image data is the same as that in the first embodiment, and a description thereof will be omitted.

  The actual projection image in the present embodiment is the same as that described in FIG. 4 of the first embodiment. In the first embodiment, the partial detailed image in the composite projection image shown in FIG. 4C is projected at the center, but in the present embodiment, this projection position is controlled by the shift lens 501. It is projected at an arbitrary position. Also in the present embodiment, as in the first embodiment, the zoom speed of the zoom lens 103 is made sufficiently high, for example, 120 Hz. As a result, the combined projection image can be displayed as a single image with improved resolution only in the area of the image on which the partial detail image is projected.

  As described above, according to the present embodiment, it is possible to display a projection image at a resolution exceeding the display resolution of the projector with respect to an arbitrary partial region of the projection image using a single projector.

  Also in the present embodiment, the process of switching between the projection image when the zoom lens 103 is at the wide end and the projection image when the zoom lens 103 is at the tele end has been described, but it is not always necessary to be at the wide end and the tele end. At two lens positions where the position of the zoom lens 103 is different, the image data to be projected is generated according to the display size of the projected image at each lens position at that time, and the resolution is also improved by projecting while switching between them Can be made.

(Third embodiment)
In the first embodiment, the two lens positions to be switched in the control of the zoom lens 103 are the two states of the wide end and the tele end. On the other hand, in the present embodiment, the state of the two lens positions to be switched in the control of the zoom lens 103 is set to a position where the projected image projected at each lens position is shifted by 1/2 pixel. A process for improving the resolution by switching and displaying the projection image according to the lens position state will be described. Note that the projector according to this embodiment has the same configuration as the projector 100 described with reference to FIG.

FIG. 9 is a flowchart illustrating an example of a procedure of high resolution processing by the projector 100 according to the present embodiment. Steps S201, S202, and S211 are the same as those in FIG. 2 described in the first embodiment, and thus the description thereof is omitted.
In step S903, the zoom control unit 121 moves the zoom lens 103 to the first lens position in accordance with the input zoom speed information. In step S904, the AF control unit 120 performs AF processing and focuses the projected image.

  Next, in step S905, the image processing unit 116 performs a scaling process on the input image data, and controls the image processing circuit 112 to generate first image data projected at the first lens position. . A detailed procedure for generating the first image data will be described later. In step S906, the D / A converter 111 converts the first image data generated in step S905 into an analog image signal, and the liquid crystal drive circuit 110 outputs the analog image signal to the liquid crystal panel 108. . Then, under the control of the projector microcomputer 115, the liquid crystal drive circuit 110 projects an image on the projection surface via the projection lens system 101 by the irradiation light from the lamp 109.

  Next, in step S907, the zoom control unit 121 moves the zoom lens 103 to the second lens position according to the input zoom speed information. The second lens position is set to a position that is deviated by 1/2 pixel with respect to the image projected at the first lens position. In step S908, the AF control unit 120 performs AF processing to focus the projected image.

  In step S909, the image processing unit 116 performs a scaling process on the input image data, and controls the image processing circuit 112 to generate second image data projected at the second lens position. . A detailed procedure for generating the second image data will be described later. In step S910, the D / A converter 111 converts the second image data generated in step S909 into an analog image signal, and the liquid crystal drive circuit 110 outputs the analog image signal to the liquid crystal panel 108. . Then, under the control of the projector microcomputer 115, the liquid crystal drive circuit 110 projects an image on the projection surface via the projection lens system 101 by the irradiation light from the lamp 109.

  Next, a method for generating the first image data projected at the first lens position and the second image data projected at the second lens position will be described. The first image data and the second image data are obtained by converting the input image data input from the image signal input terminal 114 into a known scaling process, as in the method for generating the wide-field image data described in the first embodiment. Generate by. At this time, the sampling point when generating the first image data and the sampling point when generating the second image data are sampled with a shift of ½ pixel from each other.

  FIG. 10 is a diagram showing an actual projection image in the present embodiment. In the present embodiment, the first projection image 1001 projected at the first lens position and the second projection image 1002 projected at the second lens position are divided into ½ pixels as shown in FIG. Projection is performed with the pixel pitch shifted. As in the first embodiment, the zoom speed of the zoom lens 103 is set to a sufficiently high speed, for example, 120 Hz, and the first projected image 1001 and the second projected image 1002 are switched at high speed and displayed. As a result, the synthesized projected image can be displayed as one image having a resolution exceeding the displayable resolution of the projector.

  As described above, according to the present embodiment, it is possible to display a projected image with a resolution exceeding the display resolution of the projector with respect to most of the projected image using one projector.

  In the processing described in the first to third embodiments, the input image data may be still image data or moving image data. In the case of moving image data, the same processing may be performed for each frame. In addition, the description has been given assuming that the projection surface is installed in parallel with the lens surface. However, if the projection surface is not parallel, the same effect can be obtained by performing a known process of correcting distortion of the projection image as preprocessing. Obtainable. Furthermore, in the first and second embodiments, in the projected image, the luminance of the image may be displayed differently in the portion where the partial detailed image is projected and the portion where it is not. However, a process for adjusting the luminance may be performed by image processing or the like.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

110 drive circuit, 112 image processing circuit, 115 projector microcomputer, 121 zoom control unit

Claims (7)

Projection means for projecting an image;
Zoom control means for controlling a zoom magnification of an image projected by the projection means to a first zoom magnification or a second zoom magnification smaller than the first zoom magnification;
First image generation means for generating a first image for projection at the first zoom magnification from input image data;
Second image generation means for generating a second image comprising a partial region of the first image from the input image data;
According to the zoom magnification control by the zoom control means, the first image generated by the first image generation means at the first zoom magnification and the second image generation at the second zoom magnification. A projection apparatus comprising: a projection image control unit configured to control the projection unit so as to switch and project the second image generated by the unit. Shift control means for adjusting the projection position of the image at the second zoom magnification;
The projection apparatus according to claim 1, wherein the second image generation unit generates a second image corresponding to the projection position adjusted by the shift control unit. A face recognition means for recognizing a human face area from the input image data;
The projection apparatus according to claim 2, wherein the shift control unit adjusts a face area recognized by the face recognition unit as a projection position of the second image. It further comprises eye tracking means for tracking the eyes,
The projection apparatus according to claim 2, wherein the shift control unit adjusts a viewpoint position acquired by the line-of-sight tracking unit as a projection position of the second image. The zoom control means controls the first zoom magnification and the second zoom magnification so that the pixel pitch of the projected image is shifted by 1/2 from each other,
The projection apparatus according to claim 1, wherein the second image generation unit generates a second image that is shifted by 1/2 pixel from the first image. A projection process for projecting an image;
A zoom control step of controlling a zoom magnification of an image to be projected in the projecting step to a first zoom magnification or a second zoom magnification smaller than the first zoom magnification;
A first image generation step of generating a first image for projection at the first zoom magnification from input image data;
A second image generation step of generating a second image consisting of a partial region of the first image from the input image data;
According to the zoom magnification control in the zoom control step, the first image generated in the first image generation step at the first zoom magnification and the second image generation at the second zoom magnification. A projection image control step of controlling a process in the projection step so as to switch and project the second image generated in the step. A projection process for projecting an image;
A zoom control step of controlling a zoom magnification of an image to be projected in the projecting step to a first zoom magnification or a second zoom magnification smaller than the first zoom magnification;
A first image generation step of generating a first image for projection at the first zoom magnification from input image data;
A second image generation step of generating a second image consisting of a partial region of the first image from the input image data;
According to the zoom magnification control in the zoom control step, the first image generated in the first image generation step at the first zoom magnification and the second image generation at the second zoom magnification. A program causing a computer to execute a projection image control step of controlling processing in the projection step so as to switch and project the second image generated in the step.

Images