JP2019161346A - Head-up display device and display image correction method - Google Patents

Abstract

To preferably perform distortion correction caused by the curvature of a windshield and the size correction associated with the distortion correction at the time of displaying an image.SOLUTION: A head-up display device 1 includes a video correction unit 26 that corrects video generated by a video display device 30, and a memory 24 that stores a correction table 300 for performing correction processing by a video correction unit. In the correction table 300, an image distortion correction amount corresponding to the projection position on a windshield 3 is described in advance. The video correction unit 26 refers to the correction table in order to correct the distortion of the video by referring to the distortion correction amount described in the correction table and to correct the size change of an object 110 in the video due to the distortion correction to correct the size of the object.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a head-up display device that is mounted on a vehicle or the like and that suitably displays various types of video information, and a display video correction method.

  2. Description of the Related Art In recent years, a vehicle video display device (so-called head-up display device, hereinafter referred to as HUD) that displays various types of information on a windshield (wind shield) of a vehicle has been put into practical use as one of the technologies for displaying video in a real space. ing. For example, by providing information for a driver as video information (display content) to be displayed, a driving operation of the vehicle can be supported.

  The structure of the HUD is that a video generated by a video display device such as a liquid crystal display is projected onto the windshield of the vehicle through a concave mirror, and the video reflected by the windshield is incident on the driver's eyes, so that the driver The video information is visually recognized as a virtual image in front of the vehicle. At that time, the virtual image visually recognized by the driver is distorted according to the curvature of the concave mirror. As a technique for eliminating this distortion, for example, in Patent Document 1, from a source image to a display image so as to cancel the distortion of the virtual image using a function determined from the distortion shape of the virtual image caused by the characteristics of the optical system of the HUD. A method for performing the conversion is described.

JP 2003-287707 A

  Japanese Patent Laid-Open No. 2004-228561 is directed to distortion caused by a simple curved surface shape such as an optical system in the HUD, specifically, a concave mirror, as distortion of a display image by HUD. Then, it is assumed that the video emitted from the HUD is emitted to one having no curvature (or almost no curvature) like a combiner. However, when displaying a large screen image, the image emitted from the HUD is reflected in a wide area including the end portion of the windshield, and distortion caused by the curvature of the windshield cannot be ignored. Further, since the curvature of the windshield is more complicated than the curvature of the concave mirror or combiner, it is difficult to apply the functional method proposed in Patent Document 1.

  Furthermore, when distortion correction of the display image is performed largely, the size of the displayed image changes. For example, when objects of the same size are displayed at the left and right positions in the screen, the sizes of the left and right objects will appear different, giving the driver a sense of discomfort. Therefore, not only the distortion correction but also the size correction associated therewith is required. In Patent Document 1, no consideration is given to distortion correction caused by the curvature of the windshield and size correction accompanying distortion correction.

  An object of the present invention is to provide a head-up display device and a display image correction method capable of suitably performing distortion correction due to the curvature of a windshield and size correction accompanying distortion correction when displaying an image.

  In order to solve the above-described problems, a head-up display device according to the present invention includes a video display device that has a light source and a display element to generate a video, a mirror that projects the video generated by the video display device toward a windshield, A mirror driving unit that moves the mirror position, a video correction unit that performs correction processing of a video generated by the video display device, and a memory that stores a correction table for the video correction unit to perform correction processing. In the correction table, the image distortion correction amount corresponding to the projection position on the windshield is described in advance, and the image correction unit performs image distortion correction with reference to the distortion correction amount described in the correction table. In addition, in order to correct a change in the size of the object in the video accompanying distortion correction, the object size is corrected with reference to the correction table.

  In addition, the display image correction method according to the present invention includes a step of creating a correction table in which the amount of image distortion correction corresponding to the projection position on the windshield is described in advance, and the image generated by the image display device can be moved. Projecting toward the windshield by a simple mirror, performing distortion correction on the video generated by the video display device with reference to the distortion correction amount described in the correction table, and within the video accompanying distortion correction And correcting the size of the object with reference to the correction table.

  ADVANTAGE OF THE INVENTION According to this invention, even when displaying the image | video of a big screen via a windshield, the suitable image | video which does not have distortion in an image | video and an object size can be displayed.

The schematic diagram explaining the outline | summary of HUD mounted in the vehicle. The schematic diagram which shows the video display operation | movement by HUD. The block diagram which shows the structure of the control system of HUD. The image figure which shows the outline | summary of a video correction process. The figure which shows the relationship between the display position of a mirror, and correction amount. The figure explaining the preparation method of the table for correction | amendment. The figure explaining the description style of the correction table. The figure which shows the change of the shape of the display object by an image correction process. The figure which shows the effect of a 2 step | paragraph image correction process with a test image | video. The figure explaining the size correction method of an object concretely. 3 is an overall flowchart showing a video display operation. The flowchart which shows the detail of a size correction process.

  An embodiment of a head-up display device (hereinafter referred to as HUD) according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram for explaining an outline of a HUD mounted on a vehicle. The HUD 1 is mounted on the vehicle 2 and projects an image generated by the image display device 30 onto the windshield 3 (also referred to as a windshield) of the vehicle 2 through a mirror 52. The image reflected by the windshield 3 enters the eyes of the driver, and the driver visually recognizes the image from the HUD. The video to be displayed includes information related to driving and supports driving operation. The HUD 1 includes a vehicle information acquisition unit 10 that acquires various types of vehicle information 4, a control unit 20 that generates video information to be displayed based on the vehicle information acquisition unit 10, a mirror drive unit 50 that drives a mirror 52, and a driver. A speaker 60 for outputting audio information is included. The vehicle information 4 includes various information described in FIG. 1 in addition to speed information and gear information indicating the driving state of the host vehicle.

  Here, the member to be projected is not limited to the windshield 3 and may be another member such as a combiner as long as the image is projected. The video display device 30 includes a projector having a backlight, an LCD (Liquid Crystal Display), and the like. A self-luminous VFD (Vacuum Fluorescent Display) or the like may be used.

  FIG. 2 is a schematic diagram showing an image display operation by the HUD. A video for display is emitted from the video display device 30 installed at the lower part of the dashboard of the vehicle 2. The image is reflected by the first mirror 51 and the second mirror 52 (for example, a concave mirror, a free-form surface mirror, a mirror having an optical axis asymmetric shape, etc.) and projected toward the windshield 3. The first mirror 51 is fixed, and the second mirror 52 can be rotated by a mirror driving unit 50. In the following description, the rotatable second mirror 52 is simply referred to as “mirror 52”.

  The image converged and projected from the mirror 52 is reflected by the windshield 3 and incident on the driver's eyes 5 to form an image on the retina so that the image can be visually recognized. At that time, the driver sees the virtual image 9 present in front of the windshield 3. Here, the mirror drive unit 50 adjusts the display position of the virtual image 9 in accordance with the height of the driver's eyes. That is, by rotating the mirror 50 about the axis by the mirror driving unit 50, the position of the virtual image 9 can be moved in the vertical direction so that the virtual image 9 can be viewed at an easy-to-view position.

  FIG. 3 is a block diagram showing the configuration of the control system of the HUD. Various types of vehicle information 4 are input to the vehicle information acquisition unit 10 and sent to the control unit 20. An electronic control unit (ECU, Electronic Control Unit) 21 in the control unit 20 generates a video signal (display content) displayed by the HUD 1 and various control signals for the HUD 1 based on the input vehicle information 4.

  The audio output unit 22 generates an audio signal to the speaker 60. The nonvolatile memory 23 stores a program executed by the ECU 21, and the memory 24 stores video information and control information. Note that the memory 24 stores a correction table describing data used for distortion correction and size correction of a display image to be described later.

  The video display device 30 includes a light source 31 such as an LED or a laser, an illumination optical system (not shown), and a display element 32 such as a liquid crystal element (LCD). The video light generated by the display element 32 is directed to a mirror 52. And exit.

  The light source adjustment unit 25 controls the light source 31 in the video display device 30. The video correction unit 26 corrects distortion and size of the video signal (display content) generated by the ECU 21. The display element driving unit 27 drives the display element 32 in the video display device 30 based on the corrected video signal. The mirror adjusting unit 28 adjusts the position and posture of the mirror 52 via the mirror driving unit 50 in order to move the image display position with respect to the windshield 3.

  When the display content is corrected by the video correction unit 26, the table reference position determination unit 33 determines the reference position of the correction table stored in the memory 24 according to the mirror position, and the correction amount calculation unit 34 The amount of correction to be applied to each part of the content is calculated. The table reference position determination unit 33 and the correction amount calculation unit 34 are configured by software and stored in the memory 24. Hereinafter, display image correction processing by the image correction unit 26 will be described.

  FIG. 4 is an image diagram showing an outline of the video correction process. When the video generated by the HUD 1 is displayed through the windshield 3, the windshield has a curved surface shape, so that the video (virtual image) seen by the driver is distorted. In particular, when displaying a large screen image, the degree of distortion differs depending on the display position, and the distortion is corrected in accordance with the curvature of the windshield. In addition, in the display video with distortion correction, the distortion of the object in the video is eliminated, but the display size of the object may change from the original size, so it is necessary to perform size correction to return to the original size There is.

  (A0) to (a2) are examples of the image 100 generated on the display element (LCD) 32, and (b0) to (b2) are examples of the image (virtual image) 200 on the windshield 3 viewed by the driver. It is. The image 100 on the LCD includes an object 101 (a warning mark), an object 102 (advancing direction mark), and an object 103 (a warning mark). These objects are displayed on the windshield of a pedestrian in front of the vehicle. The objects 201, 202, and 203 are displayed according to the position and the road surface condition, respectively. The objects 101 and 103 on the LCD are generated with the same shape and the same size.

  (A0) is an uncorrected image 100. At this time, the image 200 on the windshield is (b0). The left object 201 and the center object 202 are less distorted, but the right object 203 appears to be greatly distorted in the right direction. This is because the curvature of the windshield is related and the curvature is small in the central region, but the curvature is large at the end position (right region).

  (A1) is a state in which distortion correction is performed, and the object 103 is distorted in the reverse direction (left direction) to be 103 '. At this time, the video on the windshield is (b1), and the distortion of the object 203 'is eliminated, but it appears smaller than the initially assumed display size (left object 201).

  (A2) is a state in which display size correction is further performed after the distortion correction of (a1). As a result of the distortion correction of (a1), the size of the object 103 ′ is increased to 103 ″ in order to correct the reduced display size of the object 203 ′ as shown in (b1). (B2), the object 203 ″ returns to the original display size and looks the same size as the left object 201.

  As described above, in the video correction, two-stage processing of distortion correction and size correction is performed. In the above description, the distortion correction is performed for the first time and the size correction is performed for the second time. However, the order may be reversed and the size correction may be performed for the first time and the distortion correction may be performed for the second time. In that case, the first size correction may be performed by predicting the size change due to the second distortion correction and correcting it.

  FIG. 5 is a diagram illustrating the relationship between the display position of the mirror and the correction amount. The display position of the HUD image with respect to the windshield 3 can be moved in the vertical direction or the horizontal direction by moving / rotating the mirror 52 in accordance with the position of the driver's eyes. Here, images (virtual images) 200a and 200b viewed by the driver when the mirror is moved up and down are shown.

  In the state where the mirror is moved up (200a) and the state where the mirror is moved down (200b), the curvature changes due to the change in the display position of the windshield 3, and the distortion state of the image changes. As described in FIG. 4, the curvature at the right end region of the windshield 3 is larger than that at the central region. Therefore, the distortion of the objects 203a and 203b is larger than that of the objects 201 and 202 in the video. Further, since the curvature is different between the upper side and the lower side of the windshield 3 (the lower curvature is large), the state of moving downward than the distortion of the object 203a in the state of moving the mirror upward (200a) ( The distortion of the object 203b at 200b) is larger. Therefore, it is necessary to determine the distortion correction amount and the size correction amount according to the position of the mirror.

  Although the case where the mirror is moved up and down is shown here, the same applies to the case where the mirror moves left and right. It is necessary to determine the distortion correction amount and the size correction amount according to the use position of the windshield 3 in the left and right direction.

  The correction processing shown in FIGS. 4 and 5 has been described by taking as an example a vehicle that employs a windshield that has a large curvature at the right end of the windshield in the case of a right-hand drive vehicle and that has a larger curvature at the lower side in the vertical direction. Actually, since the curvature differs for each vehicle type and for each windshield, it is necessary to make corrections according to the characteristics of the vehicle on which the HUD is mounted and the windshield. Therefore, in this embodiment, in order to perform distortion correction and size correction of the display image caused by the windshield 3, a correction table unique to the vehicle on which the HUD is mounted is created and used as described below.

  FIG. 6 is a diagram for explaining a method of creating a correction table used for video correction processing. The correction table 300 is created in advance by an operator and stored in the memory 24 of the HUD 1 as one of initial adjustments when the HUD 1 is mounted on the vehicle. That is, the correction table depends on the shape of the windshield 3 of the vehicle on which the HUD 1 is mounted, the mounting position of the HUD 1, and the like, and is a table unique to the vehicle.

  (A) is a process of pixel movement adjustment. The operator displays the test video in the PC on the windshield 3 from the HUD 1. Then, visual distortion adjustment (pixel movement adjustment in the test video) is performed on the displayed test video 200 using a tool (correction table creation tool) in the PC so that the video distortion is offset.

  (B) is a process of creating a correction table. After completing the distortion adjustment, the operator creates a correction table 300 from the adjusted pixel movement amount using a tool in the PC. In the correction table 300, the pixel movement amount at each display position on the windshield 3 is described. Note that the description range of the correction table is set so as to cover the mirror movement in order to correspond to the change in the display position caused by the mirror movement described in FIG. The created correction table 300 is stored in the memory 24 in the HUD 1 by serial transfer.

  FIG. 7 is a diagram for explaining the description format of the correction table. The correction table 300 covers a range in which the HUD 1 including the mirror movement on the windshield 3 can be displayed, and cells divided by the number of pixels of the display video are arranged in a matrix form. Each cell is given coordinates (horizontal axis X, vertical axis Y) on the windshield, and the X-axis distortion correction amount ΔX and Y-axis distortion correction amount ΔY at the pixel position are in pixel units (right / upward). Is described with a + sign, and the left / down direction is a-sign). Here, the coordinates of the upper left corner of the table are the origin (X = 0, Y = 0).

  In the correction table 300, the range that can be displayed at the current mirror position is indicated by 310, and the in-table reference position corresponding to the display target object (triangle mark shown in the figure) is indicated by 320. Here, the mirror moving direction is only the vertical direction. By referring to the data at the reference position 320 in the table, the correction amount of the display target object (triangle mark) can be obtained. The in-table reference position 320 is determined as follows from the position that can be displayed by the mirror after movement (hereinafter referred to as the mirror movement position) and the display position of the object with reference to the mirror.

  From the mirror movement position M1 = (number of mirror driving pulses Mp) × (mirror movement amount ΔM per pulse), for example, when Mp = 4 and ΔM = 2, M1 = 8 (here, only in the Y-axis direction). The mirror movement position 310 shown in FIG.

  Next, when the display position of the object with reference to the mirror is set as the display start position S1 and the display end position S2, the mirror movement position M1 = (0,8) is used to convert the coordinates into the coordinates on the correction table 300. Should be added. For example, if the display position of the mirror reference object is S1 = (10, 2) and S2 = (16, 6), the coordinates on the correction table 300 are the start positions S1 ′ = (10, 10), The end position is S2 ′ = (16, 14), and the in-table reference position 320 shown in the figure is determined.

  The table reference position determination unit 33 in the control unit 20 includes an adjustment signal of the mirror adjustment unit 28 (or the number of drive pulses of the mirror drive unit 50) and an object display position based on the mirror (or an object position with respect to the entire display content). ), The reference position 320 in the correction table 300 is determined by performing the above calculation.

  FIG. 8 is a diagram showing a change in the shape of the display object due to the video correction process. The video correction unit 26 refers to the correction amount in the correction table 300 and performs two-stage correction on the object, that is, distortion correction and size correction. The case of a triangle mark as a display object is shown.

  (A) shows the original image (object 110) input to the display element (LCD) 32. FIG. When this object 110 is displayed through the windshield, it appears distorted to the driver, and thus distortion correction is necessary.

  (B) shows the shape of the object 111 after distortion correction is performed on the object 110. The correction amount in this case is a process of shifting the position of each pixel in the object by the distortion correction amount (ΔX, ΔY) described in the reference position 320 of the correction amount table 300. As a result, in the illustrated example, the corrected object 111 is reduced in the X-axis direction and the Y-axis direction.

  (C) shows the shape of the object 112 after size correction is performed on the object 110. In this case, the size correction amount is obtained by adding the distortion correction amounts (ΔX, ΔY) described in the reference position 320 of the correction amount table 300 in the X-axis direction and the Y-axis direction within the reference position 320, and obtaining the maximum total value. The value is obtained and used as the size correction amount (ΣX, ΣY). Then, the entire object is stretched and deformed in the direction opposite to the distortion correction direction by the size correction amount. A specific example of the size correction will be described later. As a result, in the illustrated example, the corrected object 112 is enlarged in the X-axis direction and the Y-axis direction.

  (D) is a state in which an object that has been subjected to two-stage correction of distortion correction and size correction is displayed through a windshield. The displayed object 210 is not distorted and can be seen by the driver in a state where the object 210 has returned to the original size.

  FIG. 9 is a diagram showing the effect of the two-stage video correction process as a test video. The example of the test image | video displayed on the windshield is shown, and the mesh pattern and the object (triangle mark) are included.

(A) is a display image without correction, and the mesh pattern and the object are distorted.
(B) is a case where only distortion correction is performed, and the distortion of the mesh pattern and the object is eliminated. However, the size (inside) of the corrected object is smaller than the original size (outside).

(C) is a case where only the size correction is performed, the mesh pattern and the object are distorted, and the size of the object is large.
(D) is a case where two-stage correction of distortion correction and size correction is performed. The distortion of the mesh pattern and the object is eliminated, and the size of the object is the same as the original size.

  FIG. 10 is a diagram for specifically explaining the object size correction method. In the size correction processing, the correction amount calculation unit 34 of the control unit 20 calculates the size correction amount, and the video correction unit 26 performs object deformation processing. Here, how the object shape is corrected using the data of the correction table 300 is specifically shown.

  (A) shows the object 120 (triangle mark) before correction | amendment and the reference position 320 in a table corresponding to it. In each cell of the correction table 300, a distortion correction amount (ΔX, ΔY) is described. The row numbers in the reference position 320 are indicated by [a1] to [a5], and the column numbers are indicated by [b1] to [b7].

(B) shows size correction in the X-axis direction. For each row number in the correction table 300, the X-axis correction amount (ΔX) is summed in the X-axis direction across the reference position 320. In the example of the figure, it is as follows.
[A1]: 0 + 0 + 0 + 0 + 0 + 0 + 1 = 1
[A2]: 0 + 0 + 0 + 0 + 0 + 0 + 1 = 1
[A3]: 0 + 0 + 0 + 0 + 0 + 1 + 1 = 2
[A4]: 0 + 0 + 0 + 0 + 0 + 1 + 1 = 2
[A5]: 0 + 0 + 0 + 0 + (-1) + (-1) + (-1) =-3

  Among the total values, the numerical value with the maximum absolute value is set as the X-axis size correction amount (ΣX), and the entire object is deformed in the X-axis direction. However, the direction of deformation is the reverse of the distortion correction. In this case, the maximum value is −3, and the object is enlarged by 3 pixels in the + direction (right direction). As a result, the shape indicated by the object 121 is obtained.

(C) shows size correction in the Y-axis direction. For each column number in the correction table 300, the Y-axis correction amount (ΔY) is summed in the Y-axis direction over the reference area 320. In the example of the figure, it is as follows.
[B1]: 0 + 0 + 0 + 0 + 0 = 0
[B2]: 0 + 0 + 0 + 0 + (− 1) = − 1
[B3]: 0 + 0 + 0 + 0 + (− 1) = − 1
[B4]: 0 + 0 + 0 + 0 + (− 1) = − 1
[B5]: 0 + 0 + 0 + 0 + (− 1) = − 1
[B6]: 0 + 0 + 0 + 0 + (− 1) = − 1
[B7]: 0 + 0 + 0 + 0 + 0 = 0

  Of the total values, the numerical value with the maximum absolute value is set as the Y-axis size correction amount (ΣY), and the entire object is deformed in the Y-axis direction. However, the direction of deformation is the reverse of the distortion correction. In this case, the maximum value is −1, and the object is reduced by one pixel in the + direction (upward direction). As a result, the shape shown in the object 122 is obtained.

  (D) shows the overall size correction result of the correction in the X-axis direction and the Y-axis direction. An object 123 obtained by enlarging 3 pixels in the X-axis direction (right direction) and reducing it by 1 pixel in the Y-axis direction (upward direction) is obtained.

  In the size correction described above, the upper left corner of the object is fixed and the entire object is stretched and deformed. However, the fixed position is not limited to this and may be the center position or the upper right corner of the object.

  FIG. 11 is an overall flowchart showing an image display operation by the HUD. Here, a process related to correction of content (object) to be displayed will be described.

  In step S401, the HUD 1 is activated, and the content to be displayed is determined in step S402. The content to be displayed is to inform the driver of the current driving state based on various vehicle information 4 acquired by the vehicle information acquisition unit 10 and to call attention to driving. The content includes, for example, the objects 101 to 103 shown in FIG.

  In S403, the current position of the mirror 52 is acquired. Specifically, the movement position of the mirror 52 can be obtained from the number of drive pulses generated by the mirror drive unit 50 under the control of the mirror adjustment unit 28.

  In S404, it is compared with the previous display state to determine whether the content to be displayed has changed or the mirror has moved. Needless to say, the first display is performed, but even when the display position of the object is different from the last display by one pixel, “there is a change in content”. If the result of determination is Yes (content has changed or mirror has moved), the process proceeds to S405, and the display size of each object in the content is corrected. This size correction process will be described later with reference to FIG. If the determination in S404 is No (the content has not changed and the mirror does not move), the process proceeds to S406.

  In step S406, the correction table 300 is referred to, and the content distortion correction is performed by the video correction unit 26 according to the mirror position. This process corresponds to the distortion correction of FIG. 8B and eliminates the distortion caused by the curvature of the windshield 3. In step S <b> 407, the light source adjustment unit 25 and the display element driving unit 27 are operated, and the corrected content is projected from the video display device 30. Thereafter, the process returns to S402 and the above steps are repeated.

  FIG. 12 is a flowchart showing details of the size correction process (S405) in FIG. This processing is performed with reference to the correction table 300 in the memory 24 with the video correction unit 26, the table reference position determination unit 33, and the correction amount calculation unit 34 as the center.

  In S411, a display object in the content to be corrected is selected. That is, size correction is performed on an object basis. In S412, the table reference position determination unit 33 determines the reference position of the correction table 300 corresponding to the selected object. As described in FIG. 7, the reference position 320 on the correction table 300 is determined from the movement position 310 of the mirror 52 acquired in S403 and the object display position in the content.

  In S413, the correction amount calculation unit 34 reads the distortion correction amount (ΔX, ΔY) of each pixel from the reference position 320 of the correction table 300, and calculates the size correction amount (ΣX, ΣY) for the object. The size correction amount is obtained by summing the distortion correction amounts (ΔX, ΔY) over the reference position 320 as described with reference to FIG. In S414, the video correction unit 26 corrects the size of the object based on the size correction amount (ΣX, ΣY).

  In S415, it is determined whether or not the size correction of all objects has been completed. If not completed, the process returns to S411 to select the next object. If completed, the process returns to S406 in FIG.

  In the calculation of the size correction amount in S413, if there are a plurality of display objects in the content, and an object that has not changed in shape and position from the previous time is included and the mirror position is the same, that object As for, the previously obtained size correction amount may be used as it is.

  In the above flowchart, the image correction is performed in two steps by dividing the image correction into distortion correction and size correction. In this case, the correction order may be any process first. Further, the distortion correction and size correction methods can be corrected by hardware and corrected by software, and may be implemented in combination as appropriate. Furthermore, when distortion correction and size correction are performed by software, both can be integrated and executed in a single process.

  According to the video correction process of the present embodiment, even when a large-screen video is displayed through the windshield, it is possible to provide a suitable video with no distortion in the video and no change in the size of the object. In addition, since distortion correction and size correction can be performed with reference to a common correction table, the efficiency of correction processing can be improved.

1: Head-up display device (HUD),
2: Vehicle,
3: Windshield,
9: Virtual image,
20: control unit,
21: Electronic control unit (ECU),
24: Memory,
26: Image correction unit,
30: video display device,
33: Table reference position determining unit,
34: correction amount calculation unit,
50: Mirror drive unit,
52: Mirror,
300: Correction table.

Claims (7)

In a head-up display device that is mounted on a vehicle, generates an image, and displays the image as a virtual image by projecting it on a windshield of the vehicle,
A video display device having a light source and a display element for generating the video;
A mirror that projects the video generated by the video display device toward the windshield;
A mirror driving unit for moving the position of the mirror;
A video correction unit that performs correction processing of the video generated by the video display device;
A memory for storing a correction table for the video correction unit to perform correction processing,
In the correction table, a distortion correction amount of an image corresponding to a projection position on the windshield is described in advance,
The video correction unit performs distortion correction of the video with reference to the distortion correction amount described in the correction table, and corrects the size change of the object in the video due to the distortion correction. A head-up display device that performs size correction of the object with reference to a correction table. The head-up display device according to claim 1,
In the correction table, the operator performs pixel movement adjustment for displaying a test image on the windshield in advance and canceling out distortion of the test image, and an X-axis direction at each display position in the windshield. A pixel movement adjustment amount in the Y-axis direction is described as the distortion correction amount,
When the video correction unit performs the size correction of the object, the distortion correction amount described in the display area of the object in the correction table is referred to and the correction amount calculation unit calculates the size of the object in the display area. A head-up display characterized in that the maximum value is summed in each of the X-axis direction and the Y-axis direction and the maximum value is used as a size correction amount, and the entire object is stretched and deformed by the size correction amount in a direction opposite to the distortion correction direction. apparatus. The head-up display device according to claim 2,
When the video correction unit performs the size correction of the object, the table reference position determination unit performs the correction from the moving position of the mirror with respect to the windshield and the display position of the object with respect to the mirror. A head-up display device that determines a reference position in a table. In the display image correction method when displaying the image as a virtual image by generating the image and projecting it on the windshield of the vehicle,
Creating a correction table in which an image distortion correction amount according to a projection position on the windshield is described in advance;
Projecting the video generated by the video display device toward the windshield by a movable mirror;
Performing distortion correction on the video generated by the video display device with reference to the distortion correction amount described in the correction table;
Performing a size correction of the object with reference to the correction table in order to correct a change in size of the object in the video accompanying the distortion correction;
A display image correction method comprising: The display image correction method according to claim 4,
In the step of creating the correction table, an operator performs a pixel movement adjustment in advance to display a test video on the windshield and cancel out distortion of the test video, and X at each display position in the windshield. A pixel movement adjustment amount in the axial direction and the Y-axis direction is described as the distortion correction amount,
In the step of correcting the size of the object, the distortion correction amount described in the display area of the object in the correction table is referred to and summed in the X-axis direction and the Y-axis direction in the display area. A display image correction method, wherein the maximum value is set as a size correction amount, and the entire object is stretched and deformed by the size correction amount in a direction opposite to the distortion correction direction. The display image correction method according to claim 5,
In the step of correcting the size of the object, a reference position in the correction table is determined based on a moving position of the mirror with respect to the windshield and a display position of the object with respect to the mirror. Display image correction method to be performed. The display image correction method according to claim 6,
The display image correction method according to claim 1, wherein the distortion correction step and the size correction step are performed in one step by integrating both correction amounts.

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