JP2007159071A - Projector, video output method, and video output program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector, a video output method, and a video output program capable of controlling colors of an output video image without allowing a user to feel an unnatural change in the colors by taking into account the physiological phenomena of eyes with respect to a change in the colors. <P>SOLUTION: An environmental light color detection section 11 detects a light temperature of environmental light. A color setting section 12 stores a color temperature set by the user. A lightness detection section 13 detects the lightness (luminance) of a video image from a video signal. A color determining section 14 determines the color temperature for internally dividing between the environmental light colors and user's setting colors depending on the lightness of the video image. A delay section 15 changes the color temperature so as to be gradually shifted from a present color temperature to the determined color temperature. A color control section 16 controls the colors of the video signal according to the color temperature from the delay section 15 and the lightness of the video signal from a video input section 10. A display control section 17 controls a display element 18 according to the video signal subjected to color control and projects the video image onto a screen 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projector, a video output method, and a video output program.

  2. Description of the Related Art Conventionally, a projector projects light on a screen of a display element such as a liquid crystal and projects it on a screen separated by a certain distance so that it can be seen on a large screen, and has an advantage that it can be moved easily. Such a projector has applications such as a meeting and a training.

In the case of a liquid crystal projector, a technology is proposed in which light from a light source is projected onto a liquid crystal through a filter that divides light into three so-called primary colors (for example, red, green, blue, cyan, magenta, yellow, etc.) and displayed on a screen. (For example, refer to Patent Document 1).
JP-A-6-317777

  By the way, in the projector described above, for example, when there is no projection light, the human eye looks at the screen based on the ambient light, but when there is projection light, the human eye looks at the screen based on the projection light. Even when there is no projection light, the environment light is temporarily viewed at the ambient temperature and the ambient light is temporarily viewed at the ambient temperature. I see the screen.

  However, when the projected image changes abruptly or when the color temperature of the ambient light changes, the eyes will not adapt and the colors will be temporarily invisible. There are physiological characteristics. For example, when a 6500K projector image is viewed under a white fluorescent lamp of 4200K, it temporarily appears blue when it becomes bright, and temporarily appears yellow when it becomes dark.

  However, although the projector according to the above prior art corrects color misregistration and does not consider the physiological characteristics of the eyes, if there is a difference between the color temperature of the ambient light and the color temperature of the projection light, When the brightness of the projected image changes, there is a problem that the color of the projected image temporarily disappears correctly.

  Accordingly, the present invention provides a projector, a video output method, and a video output program capable of controlling the color of an output video without causing an unnatural change in color in consideration of the physiological phenomenon of the eye with respect to the color change. The purpose is to do.

  To achieve the above object, according to the first aspect of the present invention, there is provided a projector for projecting an image, the ambient light color temperature detecting means for detecting the color temperature of the ambient light, and the color having the color temperature based on the light source. The temperature of the ambient light detected by the ambient light color temperature detection means based on the temperature holding means, the brightness detection means for detecting the brightness of the video, and the brightness of the video detected by the brightness detection means A color temperature determining unit for determining a color temperature by internally dividing the temperature and the color temperature held in the color temperature holding unit, and a current temperature so as to gradually transition to the color temperature determined by the color temperature determining unit A delay unit configured to change the color temperature; and a color control unit configured to control a color of an image to be projected based on the color temperature gradually changed by the delay unit.

  Further, as a preferred aspect, for example, as in claim 2, in the projector according to claim 1, the projector further comprises setting means for allowing the user to set the color temperature held in the color temperature holding means. Also good.

  As a preferred aspect, for example, as in claim 3, in the projector according to claim 1, the delay unit changes the current color so as to make a linear transition to the color temperature determined by the color temperature determination unit. The temperature may be changed.

  As a preferred mode, for example, as in claim 4, in the projector according to claim 1, the delay means changes the current color so as to make a curve transition to the color temperature determined by the color temperature determination means. The temperature may be changed.

  As a preferred aspect, for example, as in claim 5, in the projector according to claim 1, the delay means has a hysteresis characteristic in a transition from a current color temperature to the color temperature determined by the color temperature determination means. May be given.

  In order to achieve the above object, a video output method according to a sixth aspect of the invention is a video output method for projecting an image, wherein a step of detecting a color temperature of ambient light and a color temperature based on a light source are maintained. Detecting the brightness of the image; determining the color temperature by internally dividing the color temperature of the ambient light and the held color temperature based on the brightness of the image; And changing the current color temperature so as to gradually change to the determined color temperature, and controlling the color of the image to be projected based on the gradually changed color temperature. .

  In order to achieve the above object, an image output program according to a seventh aspect of the invention provides a computer with an ambient light color temperature detection function for detecting a color temperature of ambient light and a color temperature with respect to a light source. A color that determines the color temperature by dividing the color temperature of the ambient light and the held color temperature based on the brightness of the function, the brightness detection function that detects the brightness of the image, and the brightness of the image A temperature determining function, a delay function for changing the current color temperature so as to gradually transition to the determined color temperature, and a color control for controlling the color of an image to be projected based on the gradually changed color temperature It is characterized by realizing functions.

  According to the first aspect of the invention, the ambient light color temperature detecting means detects the ambient light color temperature, the brightness detecting means detects the brightness of the image, and the color temperature determining means detects the image brightness. Based on the brightness, the color temperature is determined by internally dividing the color temperature of the ambient light and the color temperature held in advance, and the current color temperature is gradually shifted to the determined color temperature by the delay unit. The color control means controls the color of the video to be projected based on the color temperature that is gradually changed. There is an advantage that the color of the output video can be controlled without causing a change.

  According to the second aspect of the present invention, since the user can set the color temperature held in the color temperature holding unit by the setting unit, the color phenomenon is considered in consideration of the physiological phenomenon of the eye with respect to the color change. There is an advantage that the color of the output video can be controlled more flexibly without feeling a natural change.

  According to the third aspect of the present invention, the current color temperature is changed by the delay means so as to make a linear transition to the color temperature determined by the color temperature determination means. Considering the physiological phenomenon of the eye, there is an advantage that the color of the output video can be controlled without causing an unnatural change in color.

  According to the fourth aspect of the present invention, the current color temperature is changed by the delay means so as to make a curve transition to the color temperature determined by the color temperature determination means. Considering the physiological phenomenon of the eye, there is an advantage that the color of the output video can be controlled without causing an unnatural change in color.

  According to the fifth aspect of the present invention, since the delay means gives a hysteresis characteristic to the transition from the current color temperature to the color temperature determined by the color temperature determination means, the eye physiology with respect to the color change. Considering the phenomenon, there is an advantage that the color of the output video can be controlled without causing an unnatural change in color.

  According to the sixth aspect of the present invention, the step of detecting the color temperature of the ambient light, the step of maintaining the color temperature based on the light source, the step of detecting the brightness of the image, and the brightness of the image And determining the color temperature by internally dividing the color temperature of the ambient light and the held color temperature, and changing the current color temperature so as to gradually transition to the determined color temperature. And a step of controlling the color of the image to be projected based on the color temperature that is gradually changed. There is an advantage that the color of the output video can be controlled without feeling any change.

  According to the seventh aspect of the invention, the computer has an ambient light color temperature detection function for detecting the ambient light color temperature, a holding function for retaining the color temperature based on the light source, and the brightness of the image. A brightness detection function for detecting, a color temperature determination function for determining a color temperature by internally dividing the color temperature of the ambient light and the color temperature that can be held based on the brightness of the image; A delay function for changing the current color temperature so as to gradually transition to the color temperature and a color control function for controlling the color of the image to be projected based on the gradually changed color temperature are realized. Therefore, it is possible to obtain the advantage that the color of the output video can be controlled without considering an unnatural change in color in consideration of the physiological phenomenon of the eye with respect to the change in color.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A. Configuration of Embodiment FIG. 1 is a block diagram showing a configuration of a projector according to an embodiment of the present invention. In the figure, a video input unit 10 inputs a video signal (RGB or the like) and supplies it to a brightness detection unit 13 and a color control unit 16. The ambient light color detection unit 11 detects the light temperature of ambient light (light source) on which the screen is installed, and supplies the detected temperature to the color determination unit 14. Environmental light sources include natural light, fluorescent lamps, and incandescent lamps. The color setting unit 12 holds the color temperature set by the user. The user looks at the image projected on the screen and presets a desired color temperature so that the most preferable color is displayed. The brightness detection unit 13 detects the brightness (luminance) of the video from the video signal and supplies it to the color determination unit 14. In this embodiment, the average value in the screen is used.

  The color determination unit 14 determines a color temperature that internally divides between the ambient light color and the user setting color according to the brightness of the video. For example, if the image brightness is 0 (completely dark), the color temperature of the ambient light is set. If the image brightness is maximum, the color temperature set by the user is set. The delay unit 15 changes the color temperature so as to gradually transition from the current color temperature to the determined color temperature. This corresponds to delaying until the color temperature is actually reached after the color temperature is determined by the color determination unit 14.

  The color control unit 16 controls the color of the video signal according to a conversion formula such that the reference white becomes a desired color according to the color temperature from the delay unit 15 and the brightness of the video signal from the video input unit 10, The color-controlled video signal is supplied to the display control unit 17. The display control unit 17 controls the display element 18 in accordance with the color-controlled video signal. The display element 18 includes a color filter, a mirror, a liquid crystal, and the like, and projects the three primary colors from the light source 19 onto the screen 20 as an image corresponding to the video signal.

B. Operation of Embodiment Next, the operation of the above-described embodiment will be described. Here, FIG. 2 is a flowchart for explaining the operation of the projector of the present embodiment. FIG. 3 is a conceptual diagram for explaining the operation of the color determination unit 14. FIG. 4 is a conceptual diagram for comparing the conventional color temperature control with the color temperature control using the delay unit 15 according to the present embodiment.

  First, the ambient light color detection unit 11 detects the color temperature of the environment where the screen 20 is installed (step S10), and the brightness detection unit 13 determines the brightness of the video signal input via the video input unit 10. It detects (step S12). Next, as shown in FIG. 3, the color determining unit 14 internally divides between the ambient light color and the user set light color set in the color setting unit 12 according to the brightness of the video signal. The temperature is determined (step S14).

  Next, the delay unit 15 gradually changes the current color temperature to the determined color temperature (step S16), and determines whether or not the determined color temperature has been reached (step S18). If the color temperature has not been reached, the process returns to step S16 to repeat the above operation. The processing in steps S16 to S18 corresponds to the operation of the delay unit 15. When the determined color temperature is reached, the color temperature, that is, the determined color temperature is fixed to the current color temperature (step S20).

  Next, according to the color temperature from the delay unit 15 and the brightness of the video signal from the video input unit 10, the color control unit 16 changes the color of the video signal according to a conversion formula so that the reference white becomes a desired color. In step S22, the display control unit 17 controls the display element 18 according to the color-controlled video signal, and projects the video on the screen 20.

  In FIG. 4, the output from the color determination unit 14, that is, the color temperature determined by the color determination unit 14 is indicated by a circle. In the conventional projector, when the color temperature is determined by the color determination unit 14, the color temperature is immediately shifted to the color temperature as indicated by the dotted line L1. On the other hand, in the projector according to the present embodiment, when the color temperature is determined by the color determination unit 14, the delay unit 15 determines the color temperature according to the adaptation speed of the human eye, as indicated by the solid line L2. Delay to gradually transition to color temperature.

  According to the above-described embodiment, when the color development standard of the projector is changed according to the ambient light color and the set light color set by the user, the change is made slowly with a delay, so that the brightness changes. Even in such a case, it is possible to suppress the situation where it appears as an unnatural color to human eyes.

In the above-described embodiment, the color temperature is linearly changed by the delay unit 15, but may be a curve or may have hysteresis.
In the above-described embodiment, the three primary colors from the light source 19 are projected on the screen 20 as an image corresponding to the video signal. However, the light from the light source 19 is sequentially used by a red filter, a green filter, and a blue filter. Depending on the amount of light that is condensed into a liquid crystal display element or a micromirror display element called DMD by a lens as red, green, or blue light, and transmitted or reflected by the display element toward the projection port of the projector device, A color image may be displayed on the screen.

It is a block diagram which shows the structure of the projector by embodiment of this invention. It is a flowchart for demonstrating operation | movement of the projector of this embodiment. It is a conceptual diagram for demonstrating operation | movement of a color determination part. It is a conceptual diagram for comparing the conventional color temperature control and the color temperature control according to the present embodiment.

Explanation of symbols

10 Video Input Unit 11 Ambient Light Color Detection Unit (Ambient Light Color Temperature Detection Means)
12 color setting section (color temperature holding means, setting means)
13 Brightness detection unit (brightness detection means)
14 Color determination unit (color temperature determination means)
15 Delay part (delay means)
16 color control unit (color control means)
17 Display Control Unit 18 Display Element 19 Light Source 20 Screen

Claims (7)

In a projector that projects an image,
Ambient light color temperature detection means for detecting the ambient light color temperature;
Color temperature holding means for holding a color temperature based on a light source;
Brightness detection means for detecting the brightness of the image;
Based on the brightness of the image detected by the brightness detection means, the color temperature of the ambient light detected by the ambient light color temperature detection means and the color temperature held by the color temperature holding means are internally divided. Color temperature determining means for determining the color temperature,
Delay means for changing the current color temperature so as to gradually transition to the color temperature determined by the color temperature determination means;
And a color control means for controlling the color of the image to be projected based on the color temperature gradually changed by the delay means.   The projector according to claim 1, further comprising a setting unit that allows a user to set a color temperature held in the color temperature holding unit.   2. The projector according to claim 1, wherein the delay unit changes the current color temperature so as to make a linear transition to the color temperature determined by the color temperature determination unit.   2. The projector according to claim 1, wherein the delay unit changes the current color temperature so as to make a curve transition to the color temperature determined by the color temperature determination unit.   2. The projector according to claim 1, wherein the delay unit gives a hysteresis characteristic to a transition from the current color temperature to the color temperature determined by the color temperature determination unit. In a video output method for projecting an image,
Detecting the color temperature of the ambient light;
Maintaining a color temperature relative to the light source;
Detecting the brightness of the image;
Determining the color temperature based on the brightness of the image by internally dividing the color temperature of the ambient light and the held color temperature;
Changing the current color temperature to gradually transition to the determined color temperature;
And a step of controlling the color of the image to be projected based on the gradually changed color temperature. On the computer,
Ambient light color temperature detection function to detect the ambient light color temperature,
Holding function to hold the color temperature based on the light source;
Brightness detection function to detect the brightness of the image,
A color temperature determination function for determining a color temperature by internally dividing the color temperature of the ambient light and the held color temperature based on the brightness of an image;
A delay function for changing the current color temperature so as to gradually transition to the determined color temperature;
And a color control function for controlling a color of the video to be projected based on the gradually changed color temperature.

Images