JP2020187226A - Image projection device - Google Patents

Abstract

To provide an image projection device capable of notifying the presence of adjusted regions when optical properties of a projection lens change.SOLUTION: An image projection device is provided, comprising setting means capable of setting a correction value to each of multiple correction points in an image, correction means configured to correct the image according to the correction values, and control means configured to notify information regarding correction points, of the multiple correction points, assigned with correction values when optical properties of a projection lens change.SELECTED DRAWING: Figure 1

Description

The present invention relates to an image projection device.

In recent years, there has been known an image projection device that can adjust not only the entire screen uniformly but also the entire screen into a plurality of divided regions. For example, Patent Document 1 discloses an image projection device that divides an image into a plurality of quadrilateral regions, adjusts one of the vertices of each of the divided quadrilateral regions, and geometrically corrects a part of the image. ..

Japanese Patent No. 5884380

However, in the prior art disclosed in Patent Document 1 described above, when the optical characteristics of the projection lens change, for example, when the zoom magnification changes or the projection lens is replaced, adjustment according to the optical characteristics before the change is applied. It may remain as it is and may not be the optimum correction.

Therefore, an object of the present invention is to provide an image projection device capable of notifying that there is an adjusted region when the optical characteristics of the projection lens change.

In order to achieve the above object, the present invention is an image projection device that projects an image through a projection lens, and a setting means capable of setting a correction value for each of a plurality of correction points in the image, and each of the above. A correction means for correcting the image based on the correction value of the above, and a control means for notifying information about the correction point for which the correction value is set among the plurality of correction points when the optical characteristics of the projection lens change. It is characterized by having.

According to the present invention, it is possible to provide an image projection device capable of notifying that there is an adjusted region when the optical characteristics of the projection lens change.

It is an overall block diagram of the image projection apparatus in Example 1 of this invention. It is explanatory drawing of the geometric correction processing in Example 1 of this invention. It is a flowchart which shows the geometric correction process in Example 1 of this invention. It is a flowchart which shows the notification processing in Example 1 of this invention. It is explanatory drawing of the notification processing in Example 1 of this invention. It is an overall block diagram of the image projection apparatus in Example 2 of this invention. It is a flowchart which shows the notification processing in Example 2 of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the configuration of the image projection device according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of the image projection device 10. The control unit 101 is composed of a microcomputer including a CPU, a memory, and the like, and controls various functional blocks described later. The operation unit 102 has a function of accepting an operation by the user. Although not specifically shown, it accepts user operations via devices such as remote controllers and keypads. In addition, the operation unit 102 can also accept user operations by serial communication, network communication, or the like (not shown).

An image signal from an external device such as a personal computer is input to the image input unit 103. The image processing unit 104 performs predetermined image processing on the image signal input to the image input unit 103 in accordance with the instruction of the control unit 101. The image processing unit 104 changes, for example, the brightness and contrast of an image.

The OSD synthesis unit 105 can superimpose an image such as a menu screen or a chart (adjustment image) on the image output from the image processing unit 104 in accordance with the instruction from the control unit 101. That is, the OSD compositing unit 105 can display the chart (adjustment image) superimposed on the image generated from the image signal input to the image input unit 103. Alternatively, the OSD compositing unit 105 can display only the chart without compositing with the image generated from the image signal input to the image input unit 103. Here, the chart is an image (adjustment image) for the user to specify and adjust specific coordinates among the coordinates obtained by dividing one screen into a plurality of parts.

The geometric correction unit (correction means) 106 performs geometric correction for each component of the image based on the correction value instructed by the control unit 101. Here, the geometric correction is a correction of color shift of less than one pixel unit on the projection screen. For example, correction of each of R, G, and B of menu 204 in FIG. 2 and correction of the projection screen when projecting on a non-planar projection surface (for example, adjustment of ALL in menu 204 in FIG. 2 (adjusting RGB at the same time)). ). Specifically, as will be described later with reference to FIG. 2, the image (image area) can be divided vertically and horizontally by a plurality of line segments, and the image can be divided into a plurality of quadrangular areas (Chart 201). With the intersection (grid point) of the line segment as the control point (correction point), the control point before movement matches the control point after movement based on the correction value (adjustment value) representing the movement amount (correction amount) of the control point. Each quadrilateral area is geometrically corrected as follows. For example, depending on the optical characteristics of the projection lens, the image may be distorted in the peripheral portion or a specific image area on the screen, or the image may be discolored due to the influence of aberration. The effects of these distortions and aberrations can be suppressed by setting the amount of movement for each control point.

The panel driving unit 107 drives the panel (light modulation element) 108 based on the image output from the geometry correction unit 106, and forms an image for light modulation on the panel 108. Three panels (for R, G, and B) are driven by the drive signal from the panel drive unit 107. The panel 108 may be a transmissive liquid crystal panel, a reflective liquid crystal panel, or a DMD. Further, the panel 108 may display R (red), G (green), and B (blue) in a time division manner on one panel (single plate).

The projection lens (projection optical system) 111 includes a focus adjustment group (focus optical system), a zoom adjustment group (zoom optical system), an aperture, an image plane curvature adjustment group (image plane curvature adjustment optical system), and an aperture (not shown). .. The focus adjustment group, the zoom adjustment group, and the curvature of field adjustment group are lens groups composed of one or more lenses. Each lens group is connected to a motor and an encoder (position detection unit), and is driven based on a drive signal from the control unit 101. By driving the focus adjustment group, it is possible to perform focus adjustment by moving the position of the surface (image plane) in which the projected image is in focus along the optical axis of the projection optical system. By driving the curvature of field adjustment group, the curvature of field is curved in a concave or convex shape around the optical axis of the projection optical system, and the degree of curvature (curvature) can be adjusted to perform curvature of field adjustment. Can be done. In the curvature of field adjustment, it is also possible to adjust the image plane flat by canceling the curvature of field. By driving the zoom adjustment group, it is possible to perform zoom adjustment by changing the angle of view of the projected light and optically scaling (enlarging or reducing) the projected image displayed on the screen. In the present embodiment, the zoom adjustment group functions as the zoom adjustment means, but the present invention is not limited to this. For example, a configuration for performing zoom adjustment that electronically changes the magnification of the projected image may function as the zoom adjusting means. Specifically, the image processing unit 104 can change the modulation region on the panel 108 to change the size of the projected image.

The diaphragm is connected to a motor and an encoder (position detection unit), and the aperture amount can be adjusted based on the drive signal from the control unit 101 to change the so-called F number. That is, the control unit 101 functions as a drive control unit.

The shift drive unit 113 includes a shift mechanism that shifts the projection lens 111 in the direction orthogonal to the optical axis (horizontal direction and vertical direction) electrically or manually by the user, and a position of the projection lens 111 in each shift direction (hereinafter, shift). It has a sensor that acquires the position). The sensor is an encoder as an example, and outputs the shift amount of the projection lens as a digital value. Further, the pulse encoder may be used to output the count value of the number of pulses indicating the shift amount from the reference position of the projection lens as a digital value, or the analog value from the potentiometer may be A / D converted to obtain the digital value. It may be output. Instead of the encoder, an end detection switch that detects that the projection lens is located at the end of the shift range may be used.

Further, in the present embodiment, the projection lens 111 has a focus adjustment group, a zoom adjustment group, an image plane curvature adjustment group, and an aperture, and has a shift drive unit 113, but the present invention is not limited thereto. It suffices to have at least a focus adjustment group.

The light source control unit 109 controls lighting, extinguishing, light intensity, and the like of the light source 110 according to the instructions of the control unit 101. The light emitted from the light source 110 is modulated by the panel 108, passes through the projection lens 111, and is imaged on a screen or the like outside the image projection device 10 to form a projection image. As the light source, an ultrahigh pressure mercury lamp, an LED, a laser or the like can be used. Further, in reality, a color separation optical system exists between the light source 110 and the panel 108, and a color synthesis optical system and the like exist between the panel 108 and the projection lens 111, but the description thereof will be described in the present embodiment. Is omitted.

Various settings of the image projection device 10 are stored in the non-volatile memory 112 as needed. As the non-volatile memory, EEPROM, flash memory and the like can be used.

Next, with reference to FIGS. 2 and 3, a processing flow when the user performs the geometric correction processing will be described. FIG. 3 is a flowchart showing the geometric correction process in the image projection device 10. Each step of FIG. 3 mainly starts execution of this process according to a computer program according to the operation of the operation unit 102 by the user. Further, it is executed by the OSD synthesis unit 105 and the geometry correction unit 106 based on the command of the control unit 101. FIG. 2 is an explanatory diagram of the geometric correction processing, and shows a chart image (adjustment image) and a guide image to be displayed in each processing.

First, in step S1, when the user selects the geometry correction function from the menu of the image projection device 10 by operating the operation unit 102, the control unit 101 acquires information on the optical characteristics of the projection lens 111. Information on the optical characteristics of the projection lens includes the position and focal length of the current focus adjustment group of the projection lens 111, the position and zoom magnification of the zoom adjustment group, the position of the curvature of field adjustment group, the aperture opening amount and F number, and the shift. The position, etc.

Next, in step S2, the OSD synthesis unit 105 superimposes and displays the N × M grid-like chart 201 on the display image (projection image) as shown in FIG. 2 (A). In the present embodiment, the chart 201 is a chart of 17 × 10 intersections (lattice points), but the chart is not limited to this, and N and M may be integers of 2 or more. Chart 201 has a plurality of grid points (correction points) 203.

Subsequently, in step S3, the OSD compositing unit 105 displays the first guide image 202 so as to surround the correction points so that the user can determine which correction point the user intends to select. The first guide image 202 is information indicating that one of the plurality of grid points 203 is selected by the OSD compositing unit 105.

Next, in step S4, the control unit 101 corrects whether or not the user operates the operation unit 102 to move the first guide image 202 to any one grid point and perform a determination operation. Determine if the target grid point has been selected. If no grid points are selected, step S4 is repeated. On the other hand, when the grid points are selected, the process proceeds to step S5.

In step S5, the geometry correction unit 106 corrects the image output from the OSD composition unit 105 based on the set value set by the user. At this time, it is not necessary to pay attention to other than the selected grid points. Therefore, as shown in FIG. 2B, the OSD compositing unit 105 changes the display shape of the first guide image 202 to the first guide image 202a, and displays the chart 201 of the selected grid points. The chart 201a may be changed only to the surroundings. In the present embodiment, as shown in FIG. 2B, a menu 204 in which a correction value can be input is displayed, and the user can perform pixel correction or R, with only each color component of R, G, and B alone. It is possible to collectively correct the pixels of the three color components G and B. However, if the correction value can be set (changed), the menu is not limited to such a menu. In this embodiment, since the menu 204 is set by ALL, the same values are contained in R, G, and B. However, when R, G, and B are adjusted respectively, different values can be set for R, G, and B, and the set values are displayed.

When the user sets the correction value and finishes the correction value setting process for the grid points, the control unit 101 sets the correction point as the correction point with correction together with the information regarding the optical characteristics acquired in S1 and the correction value regarding the correction point. It is stored in the non-volatile memory 112. However, for example, if a preset initial value (for example, a correction value when the correction value is reset (set to the initial value)) is set as the correction point, the correction point is not corrected. It is stored as a correction point of.

Subsequently, in step S6, the control unit 101 determines whether or not the end operation of the geometry correction function has been performed by the operation of the operation unit 102 by the user. If the end operation has not been performed, the process returns to step S2 and steps S2 to S6 are repeated. On the other hand, when the end operation is performed, this flow is terminated.

As described above, in the present embodiment, when the user determines the correction target point, the control unit 101 displays the menu 204 as shown in FIG. 3B, for example. Then, when the user selects a target (ALL / R / G / B) and sets a correction value by increasing or decreasing the numerical value of the target correction point with the up / down buttons or the like, the geometric correction unit 106 is based on the set correction value. To correct the image.

Next, when the optical characteristics of the projection lens change, the process of notifying the user of the presence or absence of the corrected correction point will be described with reference to the flowchart of FIG. In each step of FIG. 4, in the present embodiment, when the focus adjustment, the curvature of field adjustment, the zoom adjustment, and the like of the projection lens 111 are executed, the execution of the present process is started according to the computer program. Further, it is executed by the OSD synthesis unit 105 based on the command of the control unit 101.

First, in step S11, it is determined whether or not the projection lens 111 has been adjusted. It is determined whether or not the user has performed adjustment of the projection lens, for example, focus adjustment, curvature of field adjustment, zoom adjustment, etc. by the operation of the operation unit 102 by the user. If the projection lens is adjusted, the process proceeds to step S12, and if the projection lens is not adjusted, the process returns to step S11.

Next, in step S12, it is confirmed whether or not there is a correction point with correction from the information on whether or not each correction point is corrected, which is stored in the non-volatile memory 112. If there is a correction point with correction, the process proceeds to step S13, and if not, this process ends.

Next, in step S13, the information regarding the optical characteristics stored together with the correction points with correction is read out. Then, the information on the read optical characteristics and the information on the optical characteristics of the current projection lens are acquired and compared. As a result of the comparison, if there is a mismatch, that is, if the information regarding the optical characteristics has changed, the process proceeds to step S14, and if there is a match, that is, if there is no change in the information regarding the optical characteristics, this process ends.

Next, in step S14, the OSD synthesis unit 105 superimposes and displays the notification icon 501 as shown in FIG. 5A on the display image (projection image), and has a correction point (adjusted area) corrected by the user. Notify that and end this process. From this notification, the user can know that there is a correction point adjusted in the state before the optical characteristics (focus, zoom, curvature of field, F number, etc.) of the projection lens are changed.

Further, for example, when the user performs an operation of displaying the menu of the image projection device 10 by operating the operation unit 102 after displaying the notification icon, readjustment is recommended as shown in 502 of FIG. 5 (B). A menu indicating that there is an item to be displayed is superimposed and displayed on the display image. Then, when the user selects the display of the item for which readjustment is recommended, the item for geometric correction is displayed as the item for which readjustment is recommended as shown in 503 of FIG. 5C, and the user selects it. If so, the geometric correction may be set according to the flow of FIG. At this time, the correction points with correction may be displayed as shown in 504 of FIG. 5 (D).

As described above, according to the present embodiment, when the optical characteristics of the projection lens change, it is possible to notify that there is an adjusted region in the optical characteristics of the projection lens before the change.

Next, Example 2 of the present invention will be described. FIG. 6 shows the configuration of the image projection device 60 according to the second embodiment of the present invention. In this embodiment, the components common to those in the first embodiment are designated by the same reference numerals as those in the first embodiment. The image projection device 60 of this embodiment is different from the image projection device 10 of Example 1 in that the projection lens 211 can be replaced.

A plurality of projection lenses 211 having different optical characteristics are interchangeably mounted on the lens mounting portion 214. Further, each projection lens 211 has a lens storage unit (not shown) composed of a non-volatile memory such as an EEPROM or a flash memory, and stores various information including information on the optical characteristics of the projection lens. The control unit 101 can communicate with the projection lens 211 via the lens mounting unit, and can acquire information on the optical characteristics of the projection lens from the lens storage unit described above.

Next, with reference to FIGS. 2 and 3, a process flow when the user performs the geometric correction process will be described with reference to steps different from those of the first embodiment.

In step S1, when the user selects the geometry correction function from the menu of the image projection device 10 by operating the operation unit 102, the control unit 101 acquires information on the optical characteristics of the projection lens 111 from the lens storage unit. In this embodiment, the information regarding the optical characteristics is the lens identification information (hereinafter referred to as the lens ID) for identifying the projection lens 211. As the lens ID, the model name, serial number, or the like of the projection lens 211 can be used.

Next, when the optical characteristics of the projection lens change, the process of notifying the user of the presence or absence of the corrected correction point will be described with reference to the flowchart of FIG. 7. In this embodiment, each step of FIG. 7 is executed by the OSD synthesis unit 105 based on the command of the control unit 101 when the replacement of the projection lens 211 is detected. Further, the components common to the first embodiment are designated by the same reference numerals as those of the first embodiment, and the description thereof will be omitted.

In step S21, it is determined whether or not the replacement of the projection lens 211 is detected. The control unit 101 as the interchange detection means compares the lens ID for identifying the projection lens 211 acquired from the lens storage unit with the lens ID previously acquired and stored. When the compared lens IDs are different, it is detected that the projection lens 211 has been replaced. When the replacement of the projection lens is detected, the process proceeds to step S12, and when the replacement is not detected, that is, when the lens IDs match, this process ends.

Next, in step S12, it is confirmed whether or not there is a correction point with correction from the information on whether or not each correction point is corrected, which is stored in the non-volatile memory 112. If there is a correction point with correction, the process proceeds to step S14, and if not, this process ends.

As described above, according to the present embodiment, when the projection lens is replaced, it is possible to notify that there is an adjusted region in the projection lens before the replacement.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

For example, a notification icon is displayed to notify the user, but an LED light source that emits light of a predetermined color that can recognize the operating state of the image projection device from the outside is turned on or blinks, or a predetermined sound is generated by a control means. However, the sound may be output from a speaker or the like for notification.

Further, as described in the geometric correction, for example, by setting the luminance correction value for each specific area in the screen, it can be applied to the luminance unevenness correction for reducing the luminance unevenness in the display screen.

10 Image projection device 101 Control unit 102 Operation unit 106 Geometry correction unit

Claims (15)

An image projection device that projects an image through a projection lens.
A setting means capable of setting a correction value for each of a plurality of correction points in the image, and
A correction means for correcting the image based on each of the correction values, and
When the optical characteristics of the projection lens change, control means for notifying information about the correction point for which the correction value is set among the plurality of correction points, and
An image projection device characterized by having. The projection lens has a focus optical system and
The image projection device according to claim 1, wherein the control means notifies information about a correction point for which the correction value is set when the position of the focus optical system changes. The projection lens has a zoom optical system and
The image projection device according to claim 1 or 2, wherein the control means notifies information about a correction point for which the correction value is set when the position of the zoom optical system changes. It has a shifting means capable of shifting the projection lens in a direction orthogonal to the optical axis.
The image projection according to any one of claims 1 to 3, wherein the control means notifies information about a correction point for which the correction value is set when the shift position of the projection lens changes. apparatus. A storage means for storing the optical characteristics of the projection lens and
The projection lens has a mounting portion on which a plurality of projection lenses having different optical characteristics are interchangeably mounted.
The control means acquires information on the optical characteristics of the mounted projection lens, and when the acquired optical characteristics and the optical characteristics of the projection lens stored in the storage means are different from each other, the correction point in which the correction value is set is set. The image projection apparatus according to any one of claims 1 to 4, wherein the image projection device is characterized by notifying information about the image. It has a storage means for storing the optical characteristics of the projection lens.
The control means stores the optical characteristics of the projection lens when the correction value is set, and when the stored optical characteristics of the projection lens and the optical characteristics of the current projection lens are different from each other, the correction value is set. The image projection apparatus according to any one of claims 1 to 5, wherein the information regarding the corrected correction point is notified. It has a light modulation element that modulates the light from the light source.
The claim is characterized in that the light modulation element displays an image indicating that there is a correction point for which the correction value is set, and notifies information about the correction point for which the correction value is set. Item 6. The image projection apparatus according to any one of Items 1 to 6. The image projection device has an LED light source that emits light of a predetermined color that can be recognized from the outside of the image projection device.
The image according to any one of claims 1 to 7, wherein the control means notifies that there is a correction point for which the correction value is set by turning on or blinking the LED light source. Projection device. The image projection device has sound output means.
The method according to any one of claims 1 to 8, wherein the control means outputs a sound by the sound output means to notify that there is a correction point for which the correction value is set. Image projection device. It has a light modulation element that modulates the light from the light source.
The image projection device according to any one of claims 1 to 9, wherein the control means causes the light modulation element to display an adjustment image having a plurality of correction points in the image. The image projection device according to claim 10, wherein the control means displays an image indicating a correction point in which the correction value is set among the plurality of correction points. The image projection device according to any one of claims 1 to 11, wherein the correction value is a correction for performing geometric correction of the projected image. The image projection device according to any one of claims 1 to 11, wherein the correction value is a correction for correcting brightness unevenness of a projected image. It is a control method of an image projection device that projects an image through a projection lens.
The image projection device includes setting means capable of setting correction values for each of a plurality of correction points in the image, and
It has a correction means for correcting the image based on each of the correction values.
A method for controlling an image projection device, which comprises a step of notifying information about a correction point for which the correction value is set among the plurality of correction points when the optical characteristics of the projection lens are changed. A computer program comprising causing a computer of the image projection device to execute a process according to the control method according to claim 14.

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