JP2008072364A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector of which the correction state for trapezoidal distortions is recognized easily, since the contour part of a video is easily recognized, even if the projected video is not clear. <P>SOLUTION: The projector comprises a video signal processing part 32 which composites an input video signal with a frame video signal generated to correspond to the position, corresponding to the contour of a video of the input video signal for generating a composited video signal; a trapezoidal distortion correcting part 34 which corrects the composited video signal to correct the trapezoidal distortions; and a video projection part which generates and projects the video, corresponding to the composited video signal which has been corrected by the trapezoidal distortion correcting part 34. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a projector, and more particularly, to a projector that corrects image distortion.

  As a conventional projector, for example, “an optical device capable of quantitatively detecting the tilt angle between the screen surface and the projection optical axis of the projector has a tilt angle display means, and when necessary to correct keystone distortion, etc. And presenting the tilt angle to the user "(for example, see Patent Document 1).

JP 2005-292675 A (summary)

  However, when a conventional projector projects an image on a screen, a trapezoidal distortion caused by the inclination between the screen and the projection surface (hereinafter referred to as a trapezoidal distortion) is dark when a correction operation is performed by a key operation. In the case of unclear images such as images and video images, there is a problem that it is difficult to grasp the outline portion of the image and it is difficult to grasp the correction state of the trapezoidal distortion.

  The present invention has been made to solve such a problem, and even if the projected image is unclear, it is easy to grasp the outline portion of the image and to easily grasp the correction state of the trapezoidal distortion. The purpose is to obtain.

The projector according to the present invention includes a video signal processing unit that generates a composite video signal by synthesizing an input video signal and a frame video signal generated corresponding to a position corresponding to a contour of the video based on the video signal. A trapezoidal distortion correction unit that corrects the trapezoidal distortion by correcting the composite video signal, and a video projection unit that generates and projects an image corresponding to the composite video signal corrected by the trapezoidal distortion correction unit. Is.
In the present invention, the frame video signal corresponding to the position corresponding to the contour of the video by the input video signal is generated, and the video by the composite video signal synthesized with the input video signal is projected. Even when the projected image is unclear, it is easy to grasp the outline portion of the image, and to easily grasp the correction state of the trapezoidal distortion.

The projector according to the present invention includes a control unit that selects a hue of the frame video signal according to at least one of a hue, saturation, or brightness of the video signal input to the video signal processing unit, and the video signal The processing unit generates the frame video signal having the hue selected by the control unit.
In the present invention, the hue of the frame video signal is selected according to at least one of the hue, saturation, or brightness of the input video signal. For this reason, the hue, saturation, or brightness of the projected image is selected. A frame image with a corresponding hue can be obtained, and even when the projected image is unclear, it is easy to grasp the outline portion of the image and the correction status of the trapezoidal distortion.

In the projector according to the aspect of the invention, the control unit selects, as the hue of the frame video signal, a complementary color with respect to the hue of the contour portion of the video image.
In the present invention, the complementary color to the hue of the contour of the video is used as the hue of the frame video. For this reason, the video based on the video signal and the frame video are perceived as a combination color having a strong contrast, and the projected video is unclear. Even in such a case, it is easier to grasp the outline portion of the video and to grasp the correction state of the trapezoidal distortion.

In the projector according to the aspect of the invention, the video signal processing unit lowers the contrast of the input video signal and generates a composite video signal by combining the video signal and the frame video signal.
In the present invention, the contrast of the input video signal is lowered. Therefore, the frame video is emphasized from the video by the video signal, it is easy to grasp the outline portion of the video, and the correction status of the trapezoidal distortion is easy to grasp. .

In the projector according to the aspect of the invention, the video signal processing unit lowers the contrast of the video signal corresponding to the peripheral portion of the video based on the input video signal, and the video signal with the reduced contrast and the frame video A composite video signal obtained by combining the signals is generated, and the contrast of the video signal is lowered so that the width of the peripheral portion is wider than the width of the frame video by the frame video signal.
In the present invention, the contrast is lowered so that the peripheral portion of the video signal is wider than the width of the frame image. For this reason, the frame image is emphasized from the video signal image, and the contour portion of the video is displayed. It is easy to grasp, and it becomes easy to grasp the correction state of the trapezoidal distortion, and it is possible to project without lowering the contrast other than the peripheral portion of the image by the image signal.

  A program according to the present invention realizes the above-described video signal processing unit by a computer.

  The program according to the present invention realizes the above control unit by a computer.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing the configuration of the projector according to the first embodiment, and FIG. 2 is a diagram showing the configuration of the operation panel according to the first embodiment. As shown in the figure, the projector 1 includes a light source 11, liquid crystal light valves 12R, 12G, and 12B (hereinafter simply referred to as “liquid crystal light valve 12” if not distinguished), a projection optical system 13, and a liquid crystal light valve drive. Unit 14, control unit 20, video signal processing unit 32, frame memory 33, trapezoidal distortion correction unit 34, focus control unit 41, zoom control unit 42, operation signal processing unit 43, and operation panel 44. And a storage unit 45. Further, the video signal processing unit 32 has an OSD (On Screen Display) processing unit 320, and the control unit 20 has a calculation unit 21. Further, the operation panel 44 has keystone correction keys 441-1 and 441-2.

  The control unit 20 is connected to a video signal processing unit 32, a trapezoidal distortion correction unit 34, a focus control unit 41, a zoom control unit 42, an operation signal processing unit 43, and a storage unit 45. The control unit 20 is a microprocessor or the like. And the control program stored in the storage unit 45 is executed to control the operation of the projector 1 and the calculation unit 21 calculates various data input from each unit connected to the control unit 20. The calculation result is output to each unit.

  The video input unit 31 takes in a video signal from an external video supply device PC, performs processing such as conversion to a digital video signal if it is an analog video signal, and outputs it to the video signal processing unit 32 To do.

  A frame memory 33 is connected to the video signal processing unit 32, and the video signal processing unit 32 is configured by a microprocessor or the like and executes a program stored in the video signal processing unit 32. The video signal from 31 is stored in the frame memory 33 for each frame (one screen), and the video signal stored in the frame memory 33 (hereinafter also referred to as a frame video) is read out. Digital video data is generated by performing various types of video processing such as resolution conversion to match the resolution of the liquid crystal light valve 12. As the supplied video signal, for example, an RGB signal representing a computer video output from a personal computer or a composite video signal representing a moving picture output from a video recorder or a television receiver is supplied. The

  Further, the OSD processing unit 320 of the video signal processing unit 32 is configured to display OSD video signals such as characters and symbols representing various states of the projector 1, menu video when performing image quality adjustment, or the like according to instructions from the control unit 20, or The frame video signal for generating the frame video F corresponding to the position corresponding to the contour of the input video signal is synthesized with the input video signal to generate video data as a composite video signal, and the trapezoidal distortion correction unit 34. To supply. Note that when the OSD video or the frame video F is not displayed, the frame video read from the frame memory 33 is supplied to the trapezoidal distortion correction unit 34 as video data as it is without performing the above synthesis process.

  The trapezoidal distortion correction unit 34 corrects input video data and corrects the corrected video data in order to correct a trapezoidal distortion that occurs when projection (tilting projection) is performed with the projector 1 tilted with respect to the screen SC. Is output to the liquid crystal light valve driving unit 14. The processing of the trapezoidal distortion correction unit 34 will be further described later. If no trapezoidal distortion occurs, the video data output from the video signal processing unit 32 is supplied to the liquid crystal light valve driving unit 14 as it is without performing the correction.

  The liquid crystal light valve driving unit 14 drives the liquid crystal light valves 12R, 12G, and 12B in accordance with the input video data. The liquid crystal light valves 12R, 12G, and 12B have a plurality of pixels (not shown) formed in a matrix, and the liquid crystal light valve driving unit 14 adjusts the transmittance of each pixel to emit light from the light source 11. The modulated light. Image lights emitted from the liquid crystal light valves 12R, 12G, and 12B are combined by a cross dichroic prism (not shown) and enlarged and projected on the screen SC by the projection optical system 13. Further, the projection optical system 13 includes a focus mechanism that can change the focus of the projection light and a zoom mechanism that can change the magnification of the projection light.

  The focus control unit 41 can adjust the focus state by moving the focus lens constituting the focus mechanism of the projection optical system 13 in the optical axis direction in accordance with an instruction from the control unit 20. The focus control unit 41 can also detect the focus adjustment amount, that is, the movement amount (focus amount) of the focus lens, and can output the detected focus amount to the control unit 20.

  In accordance with an instruction from the control unit 20, the zoom control unit 42 moves the zoom lens constituting the zoom mechanism of the projection optical system 13 in the optical axis direction to change the focal length, thereby changing the image displayed on the screen SC. It is possible to change the enlargement ratio. The zoom control unit 42 also functions as a zoom amount detection unit that detects the focal length, that is, the movement amount (zoom amount) of the zoom lens, and can output the detected zoom amount to the control unit 20.

  As shown in FIG. 2, the operation panel 44 includes keystone correction keys 441-1 and 441-2 (hereinafter, simply referred to as “keystone correction key 441” if not distinguished) for performing operations in accordance with the keystone distortion correction direction. Various switches for changing the state of the projector 1 and the like are provided, and an operation signal corresponding to a key operation by the user is output to the operation signal processing unit 43. The remote controller (hereinafter simply referred to as “remote controller”) RC has various switches for changing the state of the projector 1 and the like, and sends an operation signal corresponding to a key operation by the user to the operation signal processing unit 43. Output. The operation signal processing unit 43 receives an operation signal input from the operation panel 44 or the remote controller RC and outputs it to the control unit 20.

  The storage unit 45 stores a control program executed by the control unit 20, OSD video data and frame video data for generating the OSD video and frame video F, and stores various setting values of the projector 1.

  The light source 11, the liquid crystal light valves 12R, 12G, and 12B, the projection optical system 13, and the liquid crystal light valve driving unit 14 correspond to an image projection unit in the present invention.

  With such a configuration, the projector 1 according to the first embodiment projects an image corresponding to the image signal input from the image supply device PC onto the screen SC.

  By the way, when displaying an image on the projection surface of the screen SC, if the central axis of the projection light emitted from the projector 1 does not coincide with the normal line of the projection surface of the screen SC, the image is displayed on the projection surface. The displayed image is distorted into a substantially trapezoidal shape. In other words, when the projector 1 tilts and projects an image, the projected image is distorted into a substantially trapezoidal shape. This is because the distance until the light emitted from the projector 1 reaches the screen SC is different at each point in the projected image.

  Such image distortion (trapezoidal distortion) is corrected by adjusting the image data supplied to the liquid crystal light valve 12. Thereby, the image projected on the screen SC can be displayed as an image without distortion. Such trapezoidal distortion correction will be described next.

  FIG. 3 is an explanatory diagram for explaining the keystone distortion correction of the projector. The figure shows a state where the projected image displayed on the screen SC is enlarged toward the upper side and is distorted in a trapezoidal shape when tilting upward. FIG. 3A illustrates a state before correction, and FIG. 3B illustrates a state after correction. FIGS. 3A-1 and 3B-1 are diagrams showing video data (frame video) input to the liquid crystal light valve 12, and FIGS. 3A-2 and 3B-2. These are figures which show the projection image projected on the screen SC.

  As shown in FIG. 3A-1, when the trapezoidal distortion correction unit 34 does not adjust the video data, the video 12a is formed on the liquid crystal light valves 12R, 12G, and 12B. At this time, as shown in FIG. 3A-2, a substantially trapezoidal image G1 bulging upward is displayed on the screen SC.

  Therefore, the trapezoidal distortion correction unit 34 in which the user manually operates the keystone correction key 441-1 or 441-2 of the operation panel 44 and the operation signal corresponding to the key operation is input is illustrated in FIG. As described above, the video data is adjusted, and the video formation region 12b for forming the video (actual video G2) based on the video signal is determined in the pixel region 12a of the liquid crystal light valve 12. In other words, the image forming area 12b has a trapezoidal shape opposite to the projected image G1 so that the real image G2 is displayed on the screen SC in a regular shape by canceling the trapezoidal distortion, and outside the image forming area 12b. By correcting the video data so that the transmittance of each pixel included in the region 12c is minimized, the actual video G2 is displayed on the screen SC in a regular shape as shown in FIG. 3B-2. .

  Thus, the distortion of the video displayed on the screen SC is corrected by the trapezoidal distortion correction unit 34 adjusting the video data based on the operation signal by the manual operation of the user.

  However, when the video signal input from the video supply device PC is a video signal of a blurred image such as a dark image or a video image, the outline of the image (G1, G2) projected on the screen SC is grasped. It is difficult to grasp the correction status of trapezoidal distortion correction. Therefore, in the present embodiment, the frame image F is generated at a position corresponding to the contour portion of the image based on the video signal and displayed on the screen SC, thereby clarifying the contour of the image during the trapezoidal distortion correction. . Details of such an operation will be described below with reference to FIGS.

  FIG. 4 is a diagram showing a frame image displayed on the outline portion of the image according to the first embodiment. FIG. 4A is a diagram showing a projected image before trapezoidal distortion correction projected on the screen SC, and FIG. 4B is a projected image obtained by synthesizing the frame image F projected on the screen SC. 4 (c) is a diagram showing a projected image immediately after the trapezoidal distortion correction projected on the screen SC, and FIG. 4 (d) is projected on the screen SC. It is a figure which shows the projection image after carrying out trapezoid distortion correction and predetermined time progress.

  FIG. 5 is a flowchart showing the trapezoidal distortion correction operation according to the first embodiment. First, when the user presses down the keystone correction key 441 of the operation panel 44, the operation signal processing unit 43 receives an operation signal corresponding to the key input, and inputs this operation signal to the control unit 20. The control unit 20 detects the operation of the trapezoidal correction key 441 based on the input operation signal (S1), and determines whether or not the frame image F is being displayed in the contour portion of the projected image (S2). When the frame video F is not being displayed, the control unit 20 reads the frame video data from the storage unit 45 and supplies the frame video data to the video signal processing unit 32 and instructs the generation of the frame video F. The video signal processing unit 32 The processing unit 320 generates a frame video signal corresponding to the position corresponding to the contour portion of the video based on the video signal input from the video input unit 31, and generates video data obtained by synthesizing the frame video signal and the video signal. Output (S3). The synthesized video data is projected onto the screen SC via the projection optical system 13 by the liquid crystal light valve 12 driven by the liquid crystal light valve driving unit 14 via the trapezoidal distortion correction unit 34, and FIG. As shown in FIG. 4B, the frame image F is displayed on the outline of the projected image (G1) shown in FIG.

  Here, the frame image F is, for example, a dotted line display along the contour of the image by the image signal, and a predetermined hue is used as the display color. Further, the video signal processing unit 32 may display the frame video F in a blinking manner by displaying the frame video F at a predetermined time interval.

  Next, the control unit 20 causes the trapezoidal distortion correction unit 34 to perform one step of keystone distortion correction (S4). Here, in one step of the trapezoidal distortion correction, a predetermined amount of trapezoidal distortion correction is performed in the correction direction corresponding to the key input of the keystone correction key 441-1 or 441-2. After executing one step of trapezoidal distortion correction, the control unit 20 starts a timer (S5), and whether or not the keystone correction key 441 has been released during a predetermined time (T1) until the start of repeat. Is determined (S6). When the keystone correction key 441 is not released, that is, when the keystone correction key 441 is continuously pressed during the time (T1) until the start of repeat (S7), the control unit 20 displays the keystone distortion correction unit. 34, trapezoidal distortion correction is executed by one step (S8), a timer is started (S9), and the keystone correction key 441 is released until a predetermined repeat interval time (T2) elapses. Is determined (S10). When the keystone correction key 441 is not released, that is, when the keystone correction key 441 is continuously pressed during the repeat interval time (T2) (S11), the keystone distortion correction is executed by one step (S8). . As described above, when the keystone correction key 441 is continuously input, the above steps S8 to S11 are repeated to correct the keystone distortion.

  On the other hand, when the key input of the keystone correction key 441 is not performed before the time (T1) until the start of repeat or the repeat interval time (T2) elapses, the timer is started (S12), and the operation signal processing unit 43 The presence or absence of the key input operation signal is determined (S13), and when any key input is not made before the predetermined time (T3) elapses, the control unit 20 instructs the OSD processing unit 320 of the frame video signal. The generation is terminated and the display is returned to the normal display (S15), and the trapezoidal distortion correction process is terminated (S16). By such an operation, as shown in FIG. 4C, the frame image F is displayed on the screen SC for a predetermined time (T3) after the trapezoid correction operation is completed, and the predetermined time (T3) has elapsed. Thereafter, as shown in FIG. 4D, a projected image (G2) after trapezoidal distortion correction that does not display the frame image F is projected.

  In step S13, when there is a key input before the predetermined time (T3) elapses, the control unit 20 determines whether or not the key is the keystone correction key 441 (S17). Returning to step S4, the above-described procedure is repeated. When the input key is not the keystone correction key 441, that is, when there is another key input other than the keystone correction key 441, the control unit 20 finishes generating the frame video signal to the OSD processing unit 320. Then, the display is returned to the normal display (S18), the trapezoidal distortion correction process is terminated, and the operation process for another key other than the input keystone correction key 441 is performed (S19). As a result of such an operation, when another key input other than the keystone correction key 441 is input, as shown in FIG. G2) is projected.

  As described above, in the first embodiment, when trapezoidal distortion correction is performed using the trapezoid correction key 441, a frame video signal corresponding to a position corresponding to the contour of the video by the input video signal is generated and input. Since the projected image is a composite video signal that is combined with the video signal, even if the input video signal is a video signal that is unclear, such as a dark image or a video image, It is easy to grasp and it becomes easy to grasp the correction state of the trapezoidal distortion.

  In the first embodiment, the operation when the keystone distortion correction is performed by operating the keystone correction key 441 of the operation panel 44 has been described. However, the present invention is not limited to this, and the remote controller RC includes a keystone correction key. The keystone distortion may be corrected by operating the remote controller RC.

Embodiment 2. FIG.
In the first embodiment, the video signal processing unit 32 generates the frame video F using a predetermined color. However, in the second embodiment, the video signal supplied from the video supply device PC is used. The hue (color) of the frame image F is changed accordingly. Other operations and configurations are the same as those in the first embodiment.

In the storage unit 45 according to the second embodiment, information on the hue of the frame image F corresponding to the hue, saturation, or brightness of the video signal is stored in advance.
When the control unit 20 instructs the video signal processing unit 32 to generate a frame video signal of the frame video F, the control unit 20 reads the hue, saturation, or brightness information of the video signal from the video signal processing unit 32, and stores the read information and storage. Based on the hue information of the frame image F stored in the unit 45, the hue of the frame image signal corresponding to the hue, saturation or brightness of the video signal is selected, and the selected hue information is sent to the video signal processing unit 32. input. Here, for selection of the hue, for example, a complementary color with respect to the hue of the contour portion of the video is selected as the hue of the frame video signal. As described above, the frame image F is perceived as a combination color having the strongest contrast by using the frame image F as a complementary color (hue positioned in the opposite direction in the hue circle). Note that the selection of the hue is not limited to the hue of the outline portion of the video, and the hue of the frame video signal may be selected based on the information on the hue, saturation, or brightness of the entire read video signal.

  The video signal processing unit 32 generates a frame video signal of the frame video F based on the hue information input from the control unit 20, and the frame video signal and the video signal are operated in the same manner as in the first embodiment. The video data that is synthesized is output.

  As described above, in Embodiment 2, since the hue of the frame video signal is selected according to at least one of the hue, saturation, or brightness of the video signal, the hue, saturation, or It is possible to obtain a frame image having a hue corresponding to the brightness, and even when the projected image is unclear, it is easy to grasp the outline portion of the image and to easily grasp the correction state of the trapezoidal distortion.

  In addition, since the complementary color to the hue of the contour of the video signal is selected as the hue of the frame video signal, the video by the video signal and the frame video are perceived as a color with a strong contrast and projected Even if the image is unclear, it is easier to grasp the outline portion of the video and the trapezoidal distortion correction status becomes easier to grasp.

Embodiment 3 FIG.
In the third embodiment, the contrast of the image by the input image signal is lowered, and an image in which the image with the lowered contrast and the frame image F are combined is projected. Other operations and configurations are the same as those in the first embodiment.

  When the video signal processing unit 32 in the third embodiment synthesizes the frame video signal generated by the OSD processing unit 320 and the input video signal, the peripheral part of the video based on the input video signal is displayed. And a composite video signal is generated by synthesizing the video signal with the reduced contrast and the frame video signal. Here, the video signal processing unit 32 sets the width of the peripheral portion to a predetermined width that is wider than the width of the frame video F by the frame video signal.

  In the above description, the contrast of the video signal corresponding to the peripheral portion of the video based on the input video signal is reduced. However, the present invention is not limited to this, and the contrast of the entire input video signal may be reduced.

  As described above, in the third embodiment, since the contrast of the input video signal is lowered, the frame video F is emphasized from the video image, and the outline portion of the projected video can be easily grasped. It becomes easier to grasp the correction status.

  In addition, since the contrast is lowered so that the peripheral portion of the video signal based on the video signal is wider than the width of the frame video F, the frame video F is emphasized from the video signal and it is easy to grasp the contour portion of the video. The trapezoidal distortion correction status can be easily grasped, and the image can be projected without lowering the contrast other than the peripheral portion of the video image.

  In the first to third embodiments, the liquid crystal light valve 12 is used to modulate the light emitted from the light source 11, but the present invention is not limited to this, and other spatial light modulators may be used. For example, a DMD (Digital Micro Mirror Device) (registered trademark) that projects an image by controlling the tilt of a mirror with a small area spread on a semiconductor substrate based on the image data may be used.

1 is a block diagram illustrating a configuration of a projector according to a first embodiment. 3 is a diagram showing a configuration of an operation panel according to Embodiment 1. FIG. It is explanatory drawing explaining the keystone distortion correction of a projector. It is a figure which shows the frame image | video displayed on the outline part of the image | video which concerns on Embodiment 1. FIG. 3 is a flowchart showing an operation of keystone distortion correction according to the first embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Projector, 11 Light source, 12R Liquid crystal light valve, 12G Liquid crystal light valve, 12B Liquid crystal light valve, 13 Projection optical system, 14 Liquid crystal light valve drive part, 20 Control part, 21 Arithmetic part, 31 Video input part, 32 Video signal processing Unit, 33 frame memory, 34 trapezoidal distortion correction unit, 41 focus control unit, 42 zoom control unit, 43 operation signal processing unit, 44 operation panel, 45 storage unit, 320 OSD processing unit, 441 keystone correction key, PC video supply device , RC remote control, SC screen.

Claims (7)

A video signal processing unit that generates a composite video signal by combining the input video signal and a frame video signal generated corresponding to a position corresponding to a contour of the video by the video signal;
A trapezoidal distortion correction unit that corrects the trapezoidal distortion by correcting the composite video signal;
A projector comprising: an image projection unit that generates and projects an image corresponding to the composite image signal corrected by the trapezoidal distortion correction unit. A control unit that selects the hue of the frame video signal according to at least one of hue, saturation, or brightness of the video signal input to the video signal processing unit;
The projector according to claim 1, wherein the video signal processing unit generates the frame video signal having a hue selected by the control unit.   The projector according to claim 2, wherein the control unit selects a complementary color with respect to a hue of a contour portion of an image based on the video signal as a hue of the frame video signal. The video signal processor is
The projector according to claim 1, wherein a composite video signal is generated by reducing the contrast of the input video signal and synthesizing the video signal and the frame video signal. The video signal processor is
Reducing the contrast of the video signal corresponding to the peripheral portion of the video based on the input video signal, and generating a composite video signal by combining the video signal with the reduced contrast and the frame video signal;
The projector according to any one of claims 1 to 3, wherein the contrast of the video signal is lowered so that the width of the peripheral portion is wider than the width of the frame video by the frame video signal.   A program for realizing the video signal processing unit of the projector according to claim 1 by a computer.   A program for realizing a projector control unit according to any one of claims 2 and 3 or claims 4 and 5 dependent on claims 2 and 3 by a computer.

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