Image adjustment method and projection-type image display device

Abstract

To provide an image adjustment method and a projection-type image display device that are capable of improving the image quality of an image.SOLUTION: An image adjustment method includes a step of recording a first temperature value inside a projection type image display device and a first captured image of a projection area of a projection target in a first state when image projection has elapsed for a first time, a step of recording a second temperature value inside the projection type image display device and a second captured image of the projection area of the projection target in a second state when the image projection has continued for a second time longer than the first time, a step of identifying a correlation between the first temperature value and the second temperature value and a position change amount between one or more first feature points in the first captured image and one or more second feature points in the second captured image corresponding to each of the one or more first feature points on an imaging screen of an imaging device, a step of setting, based on the correlation, an adjustment amount of the image projection position by the projection type image display device whose internal temperature is the second temperature value.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a projection-type image display device equipped with an imaging element, and a method for adjusting an image produced thereby. [Background technology]

[0002] Conventionally, a projection type image display device projects an image onto a projection target such as a screen or a building. In order to check the positional relationship (distortion) between the projection target and the projected image, the image projected onto the projection target may be photographed. Based on the photographed image, the image projected onto the projection target can be adjusted.

[0003] For example, in Patent Document 1, in a DLP projector, an image sensor is placed on the optical axis when a DMD (Digital Micromirror Device) is in the OFF state, and a screen image is read. The read image is used to adjust the projected image. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2004-163876 A Summary of the Invention [Problem to be solved by the invention]

[0005] When a projection-type image display device projects an image, the internal temperature of the image display device rises due to heat generation from the light source and absorption of internally reflected light, and the rise in temperature causes thermal expansion of optical components. This causes the projection position of the projected image to fluctuate, resulting in a deterioration in the image quality.

[0006] Therefore, an object of the present disclosure is to provide an image adjustment method and a projection-type image display device that can improve the image quality of an image. [Means for solving the problem]

[0007] In order to achieve the above object, an image adjustment method according to an embodiment of the present disclosure is a method for adjusting an image projected onto a projection target in a projection type image display device including a projection optical system that displays an image by enlarging and projecting projection light incident in a forward direction onto a projection target and external light reflected by the projection target is incident in a backward direction, and an image capture device that captures the external light incident from the projection optical system, the method including a first step of recording a first temperature value inside the projection type image display device and a first captured image of a projection area on the projection target in a first state when a first time has elapsed since the projection of the image; the second step of recording a second temperature value inside the projection type image display device and a second captured image of the projection area of ​​the projection target in a second state when the second state continues for a second time period that is longer than the first time period; the third step of identifying a correlation between the first temperature value and the second temperature value and an amount of positional change between one or more first feature points in the first captured image and one or more second feature points in the second captured image that correspond to the one or more first feature points, respectively, on an image capture screen of the image capture device; and the fourth step of setting an adjustment amount for the projection position of an image by the projection type image display device having an internal temperature of the second temperature value, based on the correlation.

[0008] In order to achieve the above object, an image adjustment method according to another embodiment of the present disclosure is a method for adjusting an image projected onto a projection target in a projection type image display device including a projection optical system that displays an image by enlarging and projecting projection light incident in a forward direction onto a projection target and external light reflected by the projection target is incident in a backward direction, and an image capture device that captures the external light incident from the projection optical system, the method including a first step of recording a first temperature value inside the projection type image display device and a first captured image of a projection area on the projection target in a first state when an internal temperature of the projection type image display device has reached a first temperature value; The method includes a second step of recording the second temperature value inside the projection type image display device and a second captured image of the projection area of ​​the projection target in a second state when the internal temperature reaches a second temperature value higher than the first temperature value; a third step of identifying a correlation between the amount of position change between one or more first feature points in the first captured image and one or more second feature points in the second captured image corresponding to each of the one or more first feature points on the captured screen of the imaging device, and the first temperature value and the second temperature value; and a fourth step of setting an adjustment amount of the projection position of the image by the projection type image display device whose internal temperature has the second temperature value based on the correlation. Effect of the Invention

[0009] According to the present disclosure, it is possible to provide an image adjustment method and a projection-type image display device that can improve the image quality of an image. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing a configuration of a projection-type image display device according to the present disclosure. [Diagram 2] FIG. 2 is a diagram showing the propagation of projected light and external light for imaging in the projection-type image display device of FIG. 1. [Diagram 3] FIG. 2 is a block diagram showing an example of the configuration of a control device of the projection type image display device of FIG. 1. [Figure 4] Flowchart showing an image adjustment process according to the first embodiment of the present disclosure. [Diagram 5]FIG. 1 is an image diagram showing a captured image recorded in the image adjustment process of the present disclosure. [Figure 6] Conceptual diagram showing the correlation between the amount of change in the position of a feature point and the internal temperature value of a projection-type image display device [Figure 7] FIG. 1 is a conceptual diagram illustrating adjustment of the projection position of an image according to the first embodiment of the present disclosure. [Figure 8] 1 is a flowchart showing an image adjustment process according to a modification of the first embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] According to a first aspect of the present disclosure, in a projection type image display device including a projection optical system that displays an image by enlarging and projecting projection light incident in a forward direction onto a projection object and external light reflected by the projection object is incident in a backward direction, and an imaging device that captures the external light incident from the projection optical system, a method for adjusting an image projected onto the projection object includes a first step of recording a first temperature value inside the projection type image display device and a first captured image of the projection area on the projection object in a first state when the projection of the image has elapsed for a first time, and a second step of recording a first captured image of the projection area on the projection object when the projection of the image has continued for a second time longer than the first time. the second step of recording a second temperature value inside the projection type image display device and a second captured image of the projection area of ​​the projection target in a state; a third step of identifying a correlation between an amount of position change between one or more first feature points in the first captured image and one or more second feature points in the second captured image corresponding to each of the one or more first feature points on the captured screen of the imaging device, and the first temperature value and the second temperature value; and a fourth step of setting an adjustment amount for the projection position of an image by the projection type image display device having an internal temperature of the second temperature value based on the correlation.

[0012] According to a second aspect of the present disclosure, in a projection type image display device including a projection optical system that displays an image by enlarging and projecting projection light incident in a forward direction onto a projection object and external light reflected by the projection object is incident in a backward direction, and an image capture device that captures the external light incident from the projection optical system, a method for adjusting an image projected onto the projection object includes a first step of recording a first temperature value inside the projection type image display device and a first captured image of a projection area on the projection object in a first state when the internal temperature of the projection type image display device reaches a first temperature value, and a second step of recording a second captured image of a projection area on the projection object when the internal temperature of the projection type image display device reaches a second temperature value higher than the first temperature value. the second step of recording a second temperature value inside the projection type image display device and a second captured image of the projection area of ​​the projection target when the internal temperature reaches a second state; a third step of identifying a correlation between an amount of position change between one or more first feature points in the first captured image and one or more second feature points in the second captured image corresponding to each of the one or more first feature points, on the captured screen of the imaging device, and the first temperature value and the second temperature value; and a fourth step of setting an adjustment amount for the projection position of an image by the projection type image display device having an internal temperature of the second temperature value based on the correlation.

[0013] According to any one of the above aspects, it is possible to improve the image quality of an image projected by a projection type image display device.

[0014] According to a third aspect of the present disclosure, there is provided the image adjustment method according to the first or second aspect, wherein one or both of the first captured image and the second captured image are recorded while image projection is temporarily stopped.

[0015] According to a fourth aspect of the present disclosure, there is provided an image adjustment method described in any one of the first to third aspects, wherein a third step includes extracting one or more first feature points in the first captured image and identifying one or more second feature points in the second captured image.

[0016] According to a fifth aspect of the present disclosure, there is provided an image adjustment method according to any one of the first to fourth aspects, wherein the second state is a plurality of states corresponding to a plurality of second temperature values, and the fourth step sets an adjustment amount for an image projection position by the projection-type image display device when the internal temperature corresponds to each of the second temperature values.

[0017] According to a sixth aspect of the present disclosure, there is provided an image adjustment method as described in any one of the first to fifth aspects, wherein the adjustment amount includes an adjustment amount of a projection position on an imaging surface of an image formed by a projection-type image display device having an internal temperature of a second temperature value, and an adjustment amount of an imaging surface position of the image.

[0018] According to a seventh aspect of the present disclosure, there is provided the image adjustment method according to any one of the first or third to sixth aspects, wherein the first time period is five minutes or less.

[0019] According to an eighth aspect of the present disclosure, there is provided a video adjustment method according to any one of the first to sixth aspects, in which, when the temperature of the surrounding environment is T0, the first temperature value T1 is a temperature value that satisfies T1≦(T0+5°C).

[0020] According to a ninth aspect of the present disclosure, there is provided an image adjustment method according to any one of the first to eighth aspects, further comprising a fifth step of adjusting the projection position of the image by the projection-type image display device based on the set adjustment amount.

[0021] According to a tenth aspect of the present disclosure, there is provided an image adjustment method as described in the ninth aspect, in which adjusting the projection position of an image by a projection-type image display device includes adjusting the projection optical system and / or adjusting the image signal input to the projection-type image display device.

[0022] According to an eleventh aspect of the present disclosure, there is provided an image adjustment method as described in the ninth or tenth aspect, in which the second states are multiple, each corresponding to a plurality of second temperature values, and adjustment of the projection position of the image by the projection-type image display device is performed when the projection-type image display device is in each of the second states.

[0023] According to a twelfth aspect of the present disclosure, there is provided the image adjustment method as recited in the ninth or tenth aspect, in which the adjustment of the projection position of the image by the projection-type image display device is performed prior to the projection of the image by the projection-type image display device.

[0024] According to a thirteenth aspect of the present disclosure, there is provided a projection type image display device that projects and displays an image onto a projection object, comprising: a light source device; a projection light generation unit that generates projection light in accordance with a video signal; a light guiding optical system that guides illumination light emitted from the light source device to the projection light generation unit; a projection optical system that enlarges and projects the projection light incident in a forward direction from the projection light generation unit onto the projection object to display an image, and in which external light reflected by the projection object is incident in a backward direction; an imaging device that images the external light incident through the projection optical system; a temperature detector that detects an internal temperature of the projection type image display device; and a control device that receives the temperature value detected by the temperature detector, wherein the control device comprises a processor and a memory device that stores instructions to be executed by the processor, the instructions including causing the projection type image display device to execute an image adjustment method described in any one of the first to twelfth aspects.

[0025] According to a fourteenth aspect of the present disclosure, there is provided a projection-type image display device as described in the thirteenth aspect, wherein the instructions further include adjusting the projection position of the image by the projection-type image display device based on the set adjustment amount.

[0026] According to a fifteenth aspect of the present disclosure, there is provided a projection-type image display device as described in the fourteenth aspect, wherein the second states are a plurality of states corresponding to a plurality of second temperature values, and a command to adjust the projection position of the image by the projection-type image display device based on the set adjustment amount is issued when the projection-type image display device is in each of the second states.

[0027] According to a sixteenth aspect of the present disclosure, there is provided a projection type image display device that projects and displays an image on a projection target, comprising: a light source device; a projection light generation unit that generates projection light in accordance with a video signal; a light guiding optical system that guides illumination light emitted from the light source device to the projection light generation unit; a projection optical system that displays an image by enlarging and projecting the projection light incident in a forward direction from the projection light generation unit onto the projection target, and in which external light reflected by the projection target is incident in a backward direction; an imaging device that images the external light incident through the projection optical system; a temperature detector that detects an internal temperature of the projection type image display device; and a control device that receives the temperature value detected by the temperature detector, wherein the control device comprises a processor and a memory device that stores data read out by the processor, and the data includes the adjustment amount set by the image adjustment method described in any one of the first to twelfth aspects.

[0028] According to a 17th aspect of the present disclosure, there is provided a projection-type image display device as described in the 16th aspect, wherein the storage device further stores instructions to be executed by the processor, the instructions further including adjusting the projection position of the image by the projection-type image display device based on the stored adjustment amount.

[0029] According to an 18th aspect of the present disclosure, there is provided a projection-type image display device as described in the 17th aspect, wherein the second states are a plurality of states corresponding to a plurality of second temperature values, and a command to adjust the projection position of the image by the projection-type image display device based on the stored adjustment amount is issued when the projection-type image display device is in each of the second states.

[0030] According to a nineteenth aspect of the present disclosure, there is provided a program for causing a processor to execute the image adjustment method according to any one of the first to twelfth aspects.

[0031] According to a twentieth aspect of the present disclosure, there is provided a non-transitory computer-readable storage medium storing a program for causing a processor to execute the image adjustment method according to any one of the first to twelfth aspects.

[0032] Any of the above-described various embodiments may be appropriately combined to achieve the effects of each of the embodiments.

[0033] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

[0034] An image adjustment method and a projection-type image display device according to an embodiment of the present disclosure will be described with reference to Figures 1 to 8. The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims. In addition, in each drawing, each element is exaggerated for ease of explanation. Note that the same reference numerals are used for substantially the same components in the drawings.

[0035] (Overall Configuration of the Projection-Type Image Display Device Pertaining to the First Embodiment) The configuration of a projection-type image display device according to the first embodiment will be described with reference to Fig. 1. Fig. 1 is a block diagram showing the configuration of a projection-type image display device 10 according to the present disclosure.

[0036] 1, the projection type image display device 10 includes a light source device 30, a light guiding optical system 40, a projection light generating section 50, a projection optical system 60, an imaging device 70, a temperature detector 80, and a control device 90. The projection type image display device 10 generates projection light in the projection light generating section 50 based on light emitted by the light source device 30 and corresponding to an input video signal, and enlarges and projects the projection light Ls generated by the projection optical system 60 onto a projection target 100 such as a screen in front to display an image, and also guides external light Lc reflected from the projection target 100 through the projection optical system 60 to the imaging device 70 to capture an image.

[0037] The light source device 30 has a solid-state light source such as a semiconductor laser and a phosphor, and emits light under the control of the control unit 90. Specifically, the light source device 30 includes a light source and an illumination optical system including various color synthesis configurations, and can emit white illumination light.

[0038] The light-guiding optical system 40 guides the light emitted from the light source device 30 to the projection light generating unit 50. The light-guiding optical system 40 is configured by appropriately arranging various optical members such as various lenses, mirrors, rods, etc.

[0039] The projection light generation unit 50 includes a spatial light modulation element (not shown in FIG. 1, see FIG. 2) such as a DMD (Digital Micromirror Device) or a liquid crystal panel. In the projection light generation unit 50, the spatial light modulation element modulates the incident light in response to a video signal.

[0040] The projection optical system 60 outputs the projection light Ls, which is incident from the projection light generating unit 50 and propagates forward (to the left in the figure), to the projection target 100 via a projection lens (not shown in FIG. 1, see FIG. 2), and enlarges and projects an image based on the spatially modulated projection light Ls. The projection optical system 60 is composed of various optical members such as various lenses, prisms, and mirrors.

[0041] The imaging device 70 receives external light Lc that is reflected by the projection object 100 and enters and passes through the projection optical system 60 in a backward direction (to the right in the figure), and captures an image using an imaging element (not shown in FIG. 1, see FIG. 2). The imaging device 70 is composed of an imaging optical system and an imaging element.

[0042] The propagation of the projection light Ls and the external light Lc for imaging will be described in detail later.

[0043] The temperature detector 80 detects the internal temperature of the projection-type image display device 10. The temperature detector 80 can be configured, for example, with one or more temperature sensors (not shown) and a data transfer unit (not shown), and measures the internal temperature of the projection-type image display device 10 with the temperature sensor, and the measured temperature value data is transmitted to the control unit 90 by the data transfer unit. The transmission of the temperature value data may be achieved by a wired connection or by wireless transfer.

[0044] The control device 90 controls the overall operation of the projection type image display device 10. The control device 90 can include, for example, a video input terminal (not shown) for inputting a video signal from the outside, and various drivers (not shown). The various drivers can include, for example, a light source driver, a wheel driver, and a display device driver. The light source driver drives the light emission operation of the light source in the light source device 30, the wheel driver drives the rotation of the phosphor wheel and color wheel provided in the light source device 30, and the display device driver can supply a video signal to a spatial light modulation element in the projection light generation unit 50 and drive the spatial light modulation element.

[0045] In this embodiment, the control device 90 receives the temperature value detected by the temperature detector 80, and can adjust the image projected onto the projection target 100 based on the internal temperature of the projection-type image display device 10. This will be described in detail later. Note that the various functions of the control unit 90 may be incorporated into each component of the projection-type image display device 10.

[0046] (Propagation of projected light and external light) The propagation of the projection light Ls and the external light Lc for imaging in the projection-type image display device 10 will be described with reference to Fig. 2. Fig. 2 is a diagram showing the propagation of the projection light Ls and the external light Lc for imaging in the projection-type image display device 10 of Fig. 1.

[0047] As shown in FIG. 2, the projection light Ls is emitted by a spatial light modulation element 55 included in the projection light generation unit 50, propagates along a projection optical axis Oa, and enters the projection optical system 60.

[0048] The projection optical system 60 may include, for example, a separation prism 61, a lens unit 62, and a projection lens 65. The projection light Ls incident from the projection light generating unit 50 passes through the separation prism 61 and is enlarged and projected onto the projection object 100 by the lens unit 62 and the projection lens 65, and an image Ims is displayed in a projection area 101 on the projection object 100.

[0049] On the other hand, the external light Lc reflected by the projection target object 100 propagates along the projection optical axis Oa in the opposite direction to the projection light Ls, passes through the projection lens 65 and the lens unit 62 in this order, and reaches the separating prism 61. The separating prism 61 has a prism surface 61a that is coated with a partial reflection coating, and at least a part of the incident external light Lc is reflected by the prism surface 61a to change its traveling direction, exits the separating prism 61 along the imaging optical axis Ob, and is introduced into the imaging device 70.

[0050] The imaging device 70 may include, for example, a prism spacer 71 and an imaging element 75. The prism spacer 71 is an element for back focus alignment of the imaging element 75. External light Lc incident on the prism spacer 71 passes through the prism spacer 71 and is incident on the imaging element 75. The imaging element 75 may be composed of, for example, a solid-state imaging element such as a CCD image sensor or a CMOS image sensor, and converts the incident external light Lc into an electrical image signal and forms a captured image Imc on the imaging screen 200.

[0051] 2 is a conceptual configuration example for explaining the propagation of the projection light Ls and the external light Lc, and is not limited to the present disclosure. The projection light generating unit 50, the projection optical system 60, and the imaging device 70 may further include other optical components.

[0052] 2, in the projection-type image display device 10 of the present disclosure, external light Lc for imaging introduced into the imaging device 70 and projection light Ls both pass through the projection optical system 60 and propagate along the same optical axis of the projection optical system 60. In such a configuration, the image Ims projected onto the projection target 100 can be adjusted based on the captured image Imc, and adjustment of the angle of view of the imaging device when adjusting the image can be omitted.

[0053] In the projection type image display device 10 shown in Fig. 1, as the projection of an image continues, the internal temperature of the projection type image display device 10 rises due to the influence of heat generation from the light source device 30 (Fig. 1), stray light, and the like. The rise in the internal temperature of the device causes thermal expansion in optical components such as the separation prism 61, lens unit 62, and projection lens 65 included in the projection optical system 60. In the optical components in the state where thermal expansion has occurred, for example, the central portion near the optical axis expands more than the peripheral portion, causing changes in shape and refractive index. This causes a shift in the projection position of the image Ims on the projection target 100, degrading the image quality.

[0054] (Control device) The projection type image display device 10 of the present disclosure can suppress deviation of the image projection position caused by thermal expansion by adjusting the image projection position using the control device 90, thereby improving the image quality. The configuration of the control device 90 will be described below with reference to FIG. 3.

[0055] Fig. 3 is a block diagram showing an example of the configuration of the control device 90 of the projection-type image display device 10 of Fig. 1. The control device 90 includes a processor 91 and a storage device 92. The control device 90 realizes a predetermined function by the processor 91 executing instructions stored in the storage device 92. The function of the control device 90 may be realized by hardware alone, or by a combination of hardware and software. The control device 90 may include one or more processors 91.

[0056] The processor 91 can be configured, for example, by a microcomputer, a CPU, an MPU, a GPU, a DSU, an FPGA, an ASIC, etc. The processor 51 may be configured by a dedicated electronic circuit designed to realize a predetermined function.

[0057] The storage device 92 is a storage medium that stores programs and data for implementing the functions of the control device 90. The storage device 92 can be implemented, for example, by a hard disk drive (HDD), an SSD, a RAM, a DRAM, a ferroelectric memory, a flash memory, a magnetic disk, or a combination of these.

[0058] For example, the control device 90 converts the electric signal D of the internal temperature value acquired from the temperature detector 80 into a digital signal by AD conversion, and processes the signal as waveform data. The signal-processed waveform data is stored in the storage device 92.

[0059] The storage device 92 stores an image adjustment program 93 and adjustment amount data 94. If the control device 90 is connected to a network, the program 93 and / or the adjustment amount data 94 may be downloaded from the network as necessary. In this embodiment, the image adjustment program 93 causes the processor 91 to execute instructions and to read out the adjustment amount data 94.

[0060] The control device 90 can output an electrical signal E by, for example, an image adjustment program 93, and drive the projection optical system 60 and the projection light adjustment by the projection light generation unit 50. This makes it possible to adjust the projection position of the image by the projection type image display device 10.

[0061] The image adjustment program 93 is read from the storage device 92 when adjusting an image on the projection-type image display device 10, and causes the processor 91 to execute an image adjustment process. The image adjustment process will be described below with reference to Figs. 4 to 8.

[0062] (Image Adjustment Process) Fig. 4 is a flowchart showing the image adjustment process 95 according to the first embodiment of the present disclosure. Fig. 5 is an image diagram showing a captured image recorded in the image adjustment process 95 according to the present disclosure. Fig. 6 is a conceptual diagram showing a correlation between the amount of position change of a feature point and the internal temperature value of the projection-type image display device. Fig. 7 is a conceptual diagram explaining adjustment of the projection position of an image according to the first embodiment of the present disclosure.

[0063] (1) First, in S101, in a first state, a first temperature value T1 inside the projection display device 10 and an image of the projection area 101 of the projection target 100 captured by the imaging device 70 are recorded. In this specification, the "first state" refers to a state in which the projection of an image by the projection display device 10 continues for a first time t1, or a state in which the internal temperature of the projection display device 10 reaches a first temperature value T1.

[0064] The first state is preferably a state before the internal temperature of the projection-type image display device 10 rises due to the influence of heat generation from the light source device 30 (FIG. 1), stray light, etc., and is a state in which the optical components included in the projection optical system 60 do not substantially undergo thermal expansion. Here, the first time t1 may be before the start of image projection (t1=0s) or after the start of image projection (t1>0s). The first time t1 is, for example, 5 minutes or less, and preferably, the first time is 1 minute or less. For example, when the temperature of the surrounding environment is T0, the first temperature value T1 is a temperature value that satisfies T1≦(T0+5° C.), and preferably, the first temperature value T1 is a temperature value that satisfies T1≦(T0+1° C.).

[0065] The captured image Imc1 in the first state may be recorded when the projection of the image by the projection-type image display device 10 is in an operating state, or may be recorded when the projection of the image is paused. By recording the captured image when the projection of the image is paused, the influence of the interference image signal on the captured screen 200 due to the reflection of the projection light can be suppressed, and a clearer captured image can be recorded. For example, the captured image Imc1 in the first state conceptually shown in FIG. 5 is recorded when the projection of the image by the projection-type image display device 10 is paused, and does not include an image of the image Ims. Note that even when the projection of the image by the projection-type image display device 10 is in an operating state, the captured image in the first state can be recorded in the same manner.

[0066] The recorded captured image is conceptually shown in Fig. 5. Fig. 5 shows an imaging coordinate system Xc-Yc, which is a two-dimensional coordinate system that defines the position of the captured image on the imaging screen 200, together with the recorded captured image. In the present embodiment, for example, as shown in Fig. 5, an image formed on the light collecting surface of the imaging device 70 can be recorded as a captured image Imc1 in the first state.

[0067] (2) Next, in S102, the projection type image display device 10 continues to project an image for a predetermined duration Δt. In this embodiment, as described later, S102 can be executed repeatedly. The present disclosure is not limited to the duration Δt. The duration Δt can be set, for example, in the range from several minutes to several hours depending on the application. Although not limited thereto, in this embodiment, the duration Δt can be set, for example, in the range from 1 minute to 120 minutes.

[0068] (3) Next, in S103, in the second state, the second temperature value T21 inside the projection display device 10 and the image of the projection area 101 of the projection target 100 captured by the image capturing device 70 are recorded.

[0069] In this specification, the "second state" refers to a state in which the projection of an image by the projection-type image display device 10 has continued for a second time period, or a state in which the internal temperature of the projection-type image display device 10 has reached a second temperature value. The second time period is longer than the first time period t1 during which the projection-type image display device 10 in the first state continued projection, and the second temperature value is higher than the first temperature value T1 inside the projection-type image display device 10 in the first state. That is, in the second state, the projection-type image display device 10 continues projection for a longer time period than in the first state, and the internal temperature has risen.

[0070] The captured image in the second state may be recorded while the projection of images by the projection-type image display device 10 is in an active state, or may be recorded while the projection of images is paused. For example, the captured image Imc21 in the second state conceptually shown in Fig. 5 is recorded while the projection of images by the projection-type image display device 10 is paused, and does not include an image of the image Ims. Note that even if the projection of images by the projection-type image display device 10 is in an active state, the captured image in the second state can be recorded in the same manner.

[0071] In the second state, thermal expansion occurs as the internal temperature of the projection display device 10 rises, and the optical and mechanical components included in the projection optical system 60 are deformed, causing a shift in the projection position and / or imaging plane position of the image Ims projected onto the projection target 100. As a result, as shown in Fig. 5, on the imaging screen 200, the captured image Imc21 of the projection area 101 where the position shift has occurred is separated from the projection position and / or imaging plane position of the captured image Imc1 recorded in the first state.

[0072] (4) Next, in S104, the correlation between the amount of position change between one or more feature points in the captured image recorded in the first state and one or more corresponding feature points in the captured image recorded in each of the second states on the captured screen and the temperature value recorded in the first state and the temperature value recorded in each of the second states is identified.

[0073] At this time, S104 may include extracting a feature point Ft1 in a captured image Imc1 recorded in the first state, and identifying a feature point Ft21 corresponding to the feature point Ft1 in a captured image Imc21 recorded in the second state. Note that the extraction of Ft1 and the identification of the feature point Ft21 corresponding to Ft1 may be performed by a user, or may be performed by an algorithm included in the image adjustment program 93 (FIG. 3).

[0074] As shown in FIG. 5, the position of the identified feature point Ft21 in the captured image Imc21 and the position of the extracted feature point Ft1 in the captured image Imc1 have a corresponding positional relationship. In this way, the feature point Ft21 in the captured image Imc21 recorded in the second state can be identified in correspondence with the feature point Ft1 in the captured image Imc1 recorded in the first state by the corresponding positional relationship in the captured images. In addition, the present disclosure is not limited to the number of feature points extracted or identified in one captured image. For example, one feature point may be extracted or identified in one captured image, or multiple feature points (not shown) may be extracted or identified.

[0075] As shown in Fig. 5, position coordinates can be specified for the feature point Ft1 and the corresponding feature point Ft21 in the imaging coordinate system Xc-Yc of the imaging screen 200. In this embodiment, as shown in the figure, coordinates (x1, y1) and coordinates (x21, y21) are specified for the feature point Ft1 and the corresponding feature point Ft21, respectively. Although not shown in Fig. 5, a coordinate Zc that specifies the imaging plane position of the captured image can be further defined in a direction perpendicular to the imaging screen 200. This makes it possible to specify Zc-axis coordinate values ​​(not shown) for the feature point Ft1 and the corresponding feature point Ft21 in the Zc-axis direction.

[0076] The determination of the correlation between the position change amount of the feature point and the internal temperature value of the projection-type image display device will be described with reference to FIG. 6. FIG. 6 exemplarily illustrates the correlation between the internal temperature of the projection-type image display device and the position of the feature point in the Xc-axis direction on the captured screen 200. As illustrated, for a feature point Ft1 in a captured image Imc1 in which the internal temperature value of the device is recorded in a first state of T1, the Xc-axis position change amount Xf1 of a feature point Ft21 in a captured image Imc21 in which the internal temperature value of the device is recorded in a second state of T21 can be calculated based on the Xc-axis coordinate value specified in the image coordinate system Xc-Yc. Similarly, for the feature point Ft1 corresponding to the first temperature value T1, the Yc-axis and Zc-axis position change amounts Yf1, Zf1 (not shown) of the feature point Ft21 corresponding to the second temperature value T21 can be calculated based on the Yc-axis coordinate value and the Zc-axis coordinate value specified in the image coordinate system Xc-Yc.

[0077] (5) Next, in S105, an adjustment amount is set for the projection position of the image by the projection display device 10 in the second state where the internal temperature is the second temperature value T21. As described above, both the projection light Ls emitted to the projection object 100 for projecting an image and the external light Lc introduced from the projection object 100 to the imaging device 70 for capturing an image propagate through the projection optical system 60. Therefore, the adjustment of the projection position of the image projected by the projection display device 10 can be performed by making an adjustment based on the captured image.

[0078] In S105, in this embodiment, for example, the amount of position change for each of the Xc axis, Yc axis, and Zc axis identified in S104 can be set as an adjustment amount for the projection position of the image by the projection type image display device 10. The set adjustment amount can be stored in the storage device 92 of the control device 90 as adjustment amount data 94 (see FIG. 3).

[0079] (6) Next, in S106, the projection position of the image projected by the projection-type image display device 10 is adjusted based on the adjustment amount set in S105. In this embodiment, the adjustment of the image by the projection-type image display device 10 can be performed by adjusting the projection optical system 60 and / or the image signal input to the projection-type image display device. The adjustment of the projection position of the image in S106 may be performed by a user, or may be automatically performed by an algorithm included in the image adjustment program 93 (FIG. 3).

[0080] More specifically, a description will be given with reference to Fig. 7. Fig. 7 shows an example in which the projection position of an image by the projection-type image display device 10 is adjusted by adjusting a captured image Imc21 in which the internal temperature is recorded in a second state with a second temperature value T21 on the captured screen 200. Fig. 7(a) shows the captured image Imc21 and the position of the feature point Ft21 before adjustment, and Fig. 7(b) shows the captured image Imc31 and the position of the feature point Ft31 after adjustment.

[0081] 7, in S106, based on the adjustment amount set in S105, the projection optical system 60 and / or the video signal input to the projection type image display device are adjusted to move the captured image Imc21 on the captured screen 200. At this time, in this embodiment, based on the position change amounts Xf1, Yf1, Zf1 (not shown) of the feature point Ft21 in the captured image Imc21 corresponding to the second temperature value T21, the captured image Imc21 can be adjusted to the position of the captured image Imc1 recorded in the first state on the captured screen 200. The corresponding feature point Ft31 in the captured image Imc31 after the adjustment can have coordinates (x1, y1, z1 (not shown)) that substantially match the corresponding feature point Ft1 in the captured image Imc1 recorded in the first state.

[0082] In addition, here, "matched coordinates" does not mean exactly the same coordinates, but actually means coordinates taking into consideration the tolerance in the adjustment, and for example, the corresponding feature point Ft31 in the adjusted captured image Imc31 may have coordinates that substantially match the corresponding feature point Ft1 in the captured image Imc1 recorded in the first state, within a tolerance of ±10%. Preferably, the feature point Ft31 has coordinates that substantially match the feature point Ft1, within a tolerance of ±5%.

[0083] Adjusting the projection optical system 60 and / or the video signal input to the projection-type image display device may include, for example, adjusting the optical system in the projection optical system 60 and / or adjusting the center position of the video signal input to the projection-type image display device based on the position change amounts Xf1, Yf1. Further detailed explanations of these adjustments will be omitted in this specification.

[0084] (7) Next, in S107, it is determined whether the captured image in the second state is repeatedly recorded. In this embodiment, for example, the above steps S102 to S106 can be repeatedly executed until the number of times n of recording the captured image reaches a predetermined reference number Ns. The reference number Ns is an integer equal to or greater than 1. Alternatively, the above steps S102 to S106 can be repeatedly executed until the second time t2n during which the projection continues reaches a predetermined reference time ts. The reference time ts has a length equal to or greater than the duration Δt set in S102. Alternatively, the above steps S102 to S106 can be repeatedly executed until the second temperature value Tn reaches a predetermined reference temperature value Ts. The reference temperature value Ts is a temperature value higher than the internal temperature value T1 of the projection-type image display device 10 recorded in the first state.

[0085] By repeatedly executing steps S102 to S106, it is possible in S103 to record second temperature values ​​T2, T3, ... Tn of the projection display device 10 in a plurality of second states and captured images Imc21, Imc22, ... Imc2n of the projection area 101. At this time, due to thermal expansion of the optical components accompanying a rise in the internal temperature of the projection display device 10, the captured images Imc21, Imc22 corresponding to the respective second states are separated from the position of the captured image Imc1 recorded in the first state, as shown in Fig. 5. Then, in S104, the correlation between the amount of position change of feature points Ft21, Ft22, .... Ft2n in the captured images Imc21, Imc22, .... Imc2n corresponding to each second state with respect to the corresponding feature point Ft1 in the captured image Imc1 in the first state and the second temperature values ​​T21, T22, .... T2n recorded in each second state is specified. In S105, the adjustment amount of the projection position of the image by the projection type image display device 10 in each second state in which the internal temperature is the second temperature value T21, T22, .... T2n is set. In S106, the projection position of the image projected by the projection type image display device 10 can be adjusted based on each adjustment amount set in S105.

[0086] In this way, by executing the image adjustment process 95 shown in Figure 4, when the projection type image display device 10 is in each of the second states, the deviation in the projection position of the image caused by thermal expansion of the optical components included in the projection optical system 60 is corrected, thereby improving the image quality.

[0087] Furthermore, the image adjustment process according to the present disclosure is not limited to the execution order of the steps shown in Fig. 4. For example, step S107 may be executed between S103 and S106.

[0088] In the above description, when adjusting an image on the projection display device 10, the image adjustment program 93 is read from the storage device 92 and the processor 91 is caused to execute the image adjustment process 95 including steps S101 to S107 shown in Fig. 4, but the present disclosure is not limited to this. For example, it is also possible to cause the processor 91 to execute only a part of the image adjustment process 95 shown in Fig. 4.

[0089] Specifically, for example, by executing S101 to S106 in advance, the adjustment amount of the projection position of the image by the projection type image display device in each of the second states can be set and stored as adjustment amount data 94 in the storage device 92 of the control device 90. Thereafter, when adjusting the image of the projection type image display device, the image adjustment program 93 can read the stored adjustment amount data 94 from the storage device 92 and set the adjustment amount of the image projected by the projection type image display device 10 from the correlation between the internal temperature at the time of adjustment, the stored amount of position change of the characteristic point, and the second temperature value. This makes it possible to correct for deviations in the projection position of the image without re-recording the temperature value and the captured image.

[0090] Furthermore, since the adjustment amount data 94 stored in the memory device 92 can be read out and image adjustments can be made, the projection position of the image when the internal temperature of the projection type image display device 10 reaches a predetermined temperature value can be adjusted in advance prior to the projection of the image by the projection type image display device 10.

[0091] In addition, in the image adjustment process 95 shown in FIG. 4, the internal temperature values ​​of the projection display device 10 corresponding to a plurality of second states and the captured images of the projection area 101 are recorded, and the adjustment amount of the projection position of the image by the projection display device 10 in each second state is set, so that the projection position of the image when the projection display device 10 is in each second state can be adjusted. However, the present disclosure is not limited to this. The adjustment of the projection position of the image of the projection display device 10 can be performed when the projection of the image continues for a predetermined time or when the internal temperature of the projection display device 10 reaches a predetermined temperature value. In this regard, the image adjustment process according to the modified example of the first embodiment of the present disclosure will be described below with reference to FIG. 8.

[0092] (Video Adjustment Process According to Modification of First Embodiment) Fig. 8 is a flowchart showing an image adjustment process 95A according to a modified example of the first embodiment of the present disclosure. In the image adjustment process 95A of Fig. 8, steps similar to those of the image adjustment process 95 of Fig. 4 are indicated by the same reference numerals, and detailed description thereof will be omitted. As shown in the figure, the image adjustment process 95A is similar to the image adjustment process 95 in S101 and S103 to S106, but differs from the image adjustment process 95 in steps R102 and R112 executed between S101 and S103.

[0093] As shown in Fig. 6, after the projection display device 10 starts projection and continues projection for a predetermined time, the rise in the internal temperature of the projection display device 10 tends to become gradually gentler. For example, at second temperature values ​​T23 and T24 in the second state after the temperature value inside the device reaches T22 shown in Fig. 6, the temperature change is small, and the positional change amount of the corresponding feature points Ft23 and Ft24 is also small. Therefore, in the image adjustment process 95A in Fig. 8, by adjusting the projection position of the image in a state in which the rise in the internal temperature of the projection display device 10 becomes gentler, it is possible to simplify the correction of the deviation of the projection position of the image due to the thermal expansion of the optical components and improve the image quality without repeatedly recording the temperature value and the captured image.

[0094] As shown in FIG. 8, in S101 of the image adjustment process 95A, in the first state, a first temperature value T1 inside the projection display device 10 and an image of the projection area 101 of the projection target 100 captured by the imaging device 70 are recorded.

[0095] The first state is preferably a state before the internal temperature of the projection-type image display device 10 rises due to the influence of heat generation from the light source device 30 (FIG. 1), stray light, and the like, and is a state in which thermal expansion does not substantially occur in the optical components included in the projection optical system 60. At this time, for example, the time during which the projection-type image display device 10 continues projection is a first time t1, and the first time t1 may be before the start of image projection (t1=0s) or after the start of image projection (t1>0s). For example, the first time is 5 minutes or less, and preferably, the first time is 1 minute or less. In addition, for example, when the temperature of the surrounding environment is T0, the first temperature value T1 is a temperature value that satisfies T1≦(T0+5° C.), and preferably, the first temperature value T1 is a temperature value that satisfies T1≦(T0+1° C.).

[0096] The captured image in the first state may be recorded while the projection of images by the projection-type image display device 10 is in progress, or may be recorded while the projection of images is paused.

[0097] Next, in R102, the projection type image display device 10 continues to project the image.

[0098] Next, in R112, it is determined whether the projection-type video display device 10 is in the "second state". In the present embodiment, when the second time t2 during which the projection-type video display device 10 continues projection reaches the time reference value tr, or when the second temperature value T2 inside the projection-type video display device 10 reaches the temperature reference value Tr, the projection-type video display device 10 is determined to be in the "second state". Here, the time reference value tr and the temperature reference value Tr can be set to the time and temperature value at which the rise in the internal temperature of the projection-type video display device 10 becomes gentle. In the present embodiment, the time reference value tr can be set to be longer than the first time t1 during which the projection-type video display device 10 in the above-described first state continues projection. Depending on the application, for example, the time reference value tr can be set in the range from several minutes to several hours. Although not limited thereto, in the present embodiment, for example, the time reference value tr can be set in the range from 1 minute to 120 minutes. The temperature reference value Tr can be set to be higher than the first temperature value T1 inside the projection-type video display device 10 in the above-described first state. Although not limited thereto, in the present embodiment, for example, when the temperature of the surrounding environment is T0, the temperature reference value Tr can be set so as to satisfy (T0 + 5°C) < Tr ≤ (T0 + 40°C), and preferably, the temperature reference value Tr can be set so as to satisfy (T0 + 5°C) < Tr ≤ (T0 + 30°C).

[0099] When it is determined that the projection-type video display device 10 is in the "second state", the video adjustment process 95A proceeds to S103, and in the second state, the second temperature value T2 inside the projection-type video display device 10 and the captured image of the projection area 101 on the projection object 100 by the imaging device 70 are recorded. Note that the captured image in the second state may be recorded while the video projection by the projection-type video display device 10 is in the operating state, or may be recorded while the video projection is in the temporarily stopped state.

[0100] Next, in S104, in the captured image screen, the amount of positional change between one or more feature points in the captured image recorded in the first state and the corresponding one or more feature points in the captured image recorded in the second state, and the correlation between the temperature value recorded in the first state and the temperature value recorded in the second state are specified.

[0101] Next, in S105, an adjustment amount of the projection position of the image by the projection display device 10 in the second state is set. At this time, for example, with respect to the feature point in the captured image recorded in the first state identified in S104, the position change amount of each of the Xc axis, Yc axis, and Zc axis of the feature point in the captured image recorded in the second state can be set as the adjustment amount of the projection position of the image by the projection display device 10. The set adjustment amount can be stored in the storage device 92 of the control device 90 as adjustment amount data 94 (see FIG. 3).

[0102] Next, in S106, the image projected by the projection-type image display device 10 is adjusted based on the adjustment amount set in S106. In this embodiment, the adjustment of the image by the projection-type image display device 10 can be performed by adjusting the projection optical system 60 and / or the image signal input to the projection-type image display device. The image adjustment in S106 may be performed by a user, or may be automatically performed by an algorithm included in the image adjustment program 93 (FIG. 3).

[0103] When adjusting an image of the projection type image display device 10, the image adjustment program 93 is read from the storage device 92, and causes the processor 91 to execute the image adjustment process 95A shown in Fig. 8. This makes it possible to adjust the image when the internal temperature of the projection type image display device 10 is rising slowly (second state), and to correct any deviation in the projection position of the image caused by thermal expansion of the optical components of the projection optical system 60.

[0104] Alternatively, by executing S101 to S105 of the image adjustment process 95A in advance, an adjustment amount for the projection position of the image in a state (second state) in which the rise in the internal temperature of the projection image display device 10 is gradual can be set, and the set adjustment amount can be stored in the storage device 92 of the control device 90 as adjustment amount data 94. Thereafter, when the projection image display device 10 is in the second state, or prior to the projection of an image by the projection image display device 10, the stored adjustment amount data 94 can be read from the storage device 92 and the processor 91 can be caused to execute S106, thereby adjusting the projection position of the image. This makes it possible to correct a deviation in the projection position of the image that may occur due to thermal expansion of the optical components of the projection optical system 60 without re-recording the temperature values ​​and the captured image, thereby improving the image quality.

[0105] As described above, the accompanying drawings and detailed description are provided to explain exemplary embodiments of the technology disclosed herein. Therefore, among the components described in the accompanying drawings and detailed description, not only components essential for solving the problem but also components that are not essential for solving the problem in order to illustrate the above technology may be included. Therefore, the fact that the non-essential components are described in the accompanying drawings or detailed description should not be interpreted as immediately indicating that the non-essential components are essential.

[0106] Although the present disclosure has been fully described in relation to the preferred embodiments with reference to the accompanying drawings, various modifications are possible within the scope of the claims. Such modifications and embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present disclosure. [Industrial Applicability]

[0107] The present disclosure is applicable to a projection-type image display device, for example, a projection-type image display device equipped with an image sensor. [Explanation of symbols]

[0108] 10 Projection type image display device 30 Light source device 40 Light guiding optical system 50 Projection light generating unit 60 Projection Optical System 70 Imaging Device 80 Temperature Sensor 90 Control device 55 Spatial Light Modulator 61 Separation Prism 62 Lens unit 65 Projection Lens 71 Prism Spacer 75 Image sensor 100 Projection target 101 Projection Area 91 Processor 92 Storage device 93 Image Adjustment Program 94 Adjustment data

Claims

1. A method for adjusting an image projected onto a projection object in a projection type image display device including a projection optical system that projects a forward-incident projection light onto a projection object in an enlarged manner to display an image, and an external light reflected by the projection object is incident backward, and an image capturing device that captures the external light incident from the projection optical system, comprising: a first step of recording a first temperature value inside the projection type image display device and a first captured image of a projection area on the projection target in a first state when a first time has elapsed since the projection of the image; a second step of recording a second temperature value inside the projection type image display device and a second captured image of the projection area on the projection target in a second state when the projection of the image continues for a second time period longer than the first time period; a third step of determining a correlation between a position change amount between one or more first feature points in the first captured image and one or more second feature points in the second captured image corresponding to each of the one or more first feature points on an image capture screen of the imaging device, and the first temperature value and the second temperature value; a fourth step of setting an adjustment amount of a projection position of an image by the projection-type image display device when the internal temperature has the second temperature value based on the correlation; Including, How to adjust the image.

2. A method for adjusting an image projected onto a projection object in a projection type image display device including a projection optical system that projects a forward-incident projection light onto a projection object in an enlarged manner to display an image, and an external light reflected by the projection object is incident backward, and an image capturing device that captures the external light incident from the projection optical system, comprising: a first step of recording a first temperature value inside the projection-type image display device and a first captured image of a projection area of ​​the projection target in a first state when an internal temperature of the projection-type image display device has reached a first temperature value; a second step of recording a second temperature value inside the projection type image display device and a second captured image of the projection area of ​​the projection target object in a second state when the internal temperature of the projection type image display device reaches a second temperature value higher than the first temperature value; a third step of determining a correlation between a position change amount between one or more first feature points in the first captured image and one or more second feature points in the second captured image corresponding to each of the one or more first feature points on an image capture screen of the imaging device, and the first temperature value and the second temperature value; a fourth step of setting an adjustment amount of a projection position of an image by the projection-type image display device when the internal temperature has the second temperature value based on the correlation; Including, How to adjust the image.

3. One or both of the first captured image and the second captured image are recorded while the projection of the image is temporarily stopped.

3. The image adjustment method according to claim 1 or 2.

4. The third step is extracting one or more of the first feature points in the first captured image; identifying one or more of the second feature points in the second captured image; Including, 3. The image adjustment method according to claim 1 or 2.

5. The second state includes a plurality of second temperature values, each of which corresponds to a corresponding second temperature value, The fourth step includes setting an adjustment amount of a projection position of an image by the projection-type image display device when the internal temperature is the second temperature value.

3. The image adjustment method according to claim 1 or 2.

6. The adjustment amount is an adjustment amount of a projection position on an imaging plane of an image formed by the projection-type image display device when the internal temperature is the second temperature value, and an adjustment amount of an imaging plane position of the image, 3. The image adjustment method according to claim 1 or 2.

7. The first time period is 5 minutes or less. The image adjustment method according to claim 1 .

8. When the temperature of the surrounding environment is T0, the first temperature value T1 is a temperature value that satisfies T1≦(T0+5° C.).

3. The image adjustment method according to claim 1 or 2.

9. a fifth step of adjusting a projection position of an image by the projection-type image display device based on the set adjustment amount; 3. The image adjustment method according to claim 1 or 2.

10. Adjusting the projection position of the image by the projection type image display device includes: Adjustment of the projection optical system and / or adjustment of a video signal input to a projection-type image display device. The image adjustment method according to claim 9.

11. The second state includes a plurality of second temperature values, each of which corresponds to a corresponding second temperature value, adjusting the projection position of the image by the projection-type image display device is performed when the projection-type image display device is in the second state; The image adjustment method according to claim 9.

12. The step of adjusting the projection position of the image by the projection-type image display device is performed prior to the projection of the image by the projection-type image display device. The image adjustment method according to claim 9.

13. A projection type image display device that projects and displays an image on a projection target, A light source device; a projection light generating unit that generates projection light in accordance with a video signal; a light guide optical system that guides the illumination light emitted from the light source device to the projection light generating unit; a projection optical system that projects the projection light incident from the projection light generating unit in a forward direction onto a projection object to display an image, and external light reflected by the projection object is incident in a backward direction; an imaging device that captures an image of external light that has passed through the projection optical system; a temperature detector for detecting an internal temperature of the projection-type image display device; A control device that receives the temperature value detected by the temperature detector; Equipped with The control device includes: A processor; a memory device storing instructions for execution by the processor; Equipped with The instructions include instructions for executing the image adjustment method according to claim 1 or 2. Projection type image display device.

14. The instruction: and adjusting a projection position of the image by the projection-type image display device based on the set adjustment amount.

14. The projection type image display device according to claim 13.

15. The second state includes a plurality of second temperature values, each of which corresponds to a corresponding second temperature value, a command to adjust the projection position of the image by the projection-type image display device based on the set adjustment amount is issued when the projection-type image display device is in the second state; 15. The projection type image display device according to claim 14.

16. A projection type image display device that projects and displays an image on a projection target, A light source device; a projection light generating unit that generates projection light in accordance with a video signal; a light guide optical system that guides the illumination light emitted from the light source device to the projection light generating unit; a projection optical system that projects the projection light incident from the projection light generating unit in a forward direction onto a projection object to display an image, and external light reflected by the projection object is incident in a backward direction; an imaging device that captures an image of external light that has passed through the projection optical system; a temperature detector for detecting an internal temperature of the projection-type image display device; A control device that receives the temperature value detected by the temperature detector; Equipped with The control device includes: A processor; A storage device storing data to be read by the processor; Equipped with The data includes the adjustment amount set by the image adjustment method according to claim 1 or 2. Projection type image display device.

17. The storage device further stores instructions for execution by the processor; the instructions further include adjusting a projection position of an image by the projection-type image display device based on the stored adjustment amount.

17. The projection type image display device according to claim 16.

18. The second state includes a plurality of second temperature values, each of which corresponds to a corresponding second temperature value, a command to adjust the projection position of the image by the projection-type image display device based on the stored adjustment amount is issued when the projection-type image display device is in the second state; 18. The projection type image display device according to claim 17.

19. A program that causes a processor to execute the image adjustment method according to claim 1 or 2.

20. A non-transitory computer-readable storage medium storing a program for causing a processor to execute the image adjustment method according to claim 1 or 2.

Images