JP2010092692A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of achieving a comfortable viewing environment of enhanced presence. <P>SOLUTION: An image data input part 54 acquires an RGB signal as color information of each pixel constituting an image frame, from an image display. A color difference calculation part 55 calculates a color difference of each pixel between the two frames different in imaged time points. A pixel specifying part 56 specifies a pixel with the color difference calculated by the color difference calculation part 55 smaller than a prescribed color difference threshold. A chromaticity calculation part 57 calculates an average value as to each of L*s, a*s and b*s, using the L*s, the a*s and the b*s as the color information of each pixel with the color difference smaller than the prescribed color difference threshold, and calculates a chromaticity by conversion into the RGB value, using the calculated average values. A light color control unit 512 controls light colors of light source parts 2, 3, using the chromaticity calculated by the chromaticity calculation part 57. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an illuminating device that illuminates the surroundings of a device such as an image display device in a room.

In recent years, with the development of high-performance image display devices such as liquid crystal display devices and EL (Electroluminescence) display devices and the development of broadcast distribution technology due to the advancement of digital broadcasting technology, an environment where high-quality images can be viewed is being prepared. is there. On the other hand, there is a method for controlling the lighting in the room where the image display device is installed in order to enhance the comfort, comfort, presence, power, activity, etc. It has been studied.

For example, the three-color signal and luminance signal of a color television image are extracted, and the three-color signal for each image is integrated to obtain a color signal, and the average luminance is obtained from the luminance signal for each image, and illumination is performed from the color signal and the luminance signal. Calculate the appropriate light mixture illuminance ratio of the light source. And the light color variable illumination apparatus which can implement | achieve the illumination light effective for image viewing instantly by the calculated appropriate light mixture is disclosed (refer patent document 1).
Japanese Patent Laid-Open No. 2-158094

  However, in the illumination device of Patent Document 1, the light color of the light source is controlled using the average color of the entire image displayed on the screen of the color television, so that images of people and objects are frequently displayed on the screen. When it changes, the light color of the lighting also changes frequently, and there are problems for viewers such as hard to see the image and tired eyes. In addition, since the light color of illumination is set for each image, that is, only for each frame, if the average color fluctuates between frames, the lighting flickers, causing discomfort. there were.

  The present invention has been made in view of such circumstances, and an object thereof is to provide an illuminating device that can realize a viewing environment that is comfortable and enhances a sense of reality.

  An illuminating device according to the present invention includes a light color control unit that controls a light color of a light source and a moving image displayed on the image display device. Chromaticity calculation means for calculating the chromaticity of a region with little movement, and the light color control means is configured to control the light color of the light source according to the chromaticity calculated by the chromaticity calculation means. It is characterized by being.

  An illumination device according to the present invention includes an acquisition unit that acquires image data of a moving image displayed on the image display device, and the chromaticity calculation unit uses different image frames acquired by the acquisition unit. The chromaticity is calculated such that a region having a small color difference between the pixels constituting the image is a region having a small motion of the moving image.

  The illumination device according to the present invention includes a color difference calculation unit that calculates the color difference of each pixel using color information of each pixel constituting an image of a different frame, and the color difference calculated by the color difference calculation unit is a predetermined color difference threshold value. Specifying means for specifying a smaller pixel, and the chromaticity calculating means is configured to calculate chromaticity using color information of the pixel specified by the specifying means.

  The illuminating device according to the present invention includes a light amount control means for controlling a light amount of the light source.

  In the present invention, the illuminating device calculates the chromaticity of an area where the motion image displayed on the image display device has little motion, and controls the light color of the light source according to the calculated chromaticity. The moving image includes, for example, a case where images of 30 frames are sequentially displayed per second, and a case where still images are displayed at a relatively long time interval (for example, twice per second). In addition, the region where the motion image is less moving is not limited to the background image, for example, the background portion of a person or object that moves in the screen of the image display device, or when the background is moving in the screen, It is the part of the person or object that is doing. If the calculated chromaticity is relatively large, the light color of the light source is changed to a cold color according to the chromaticity, and if the calculated chromaticity is relatively small, the light color of the light source is changed to chromaticity. Change to warm color accordingly. Thereby, even if the image of a person or an object frequently changes in the screen, it is possible to suppress the light color of the light source from changing frequently, and to maintain comfort and comfort. In addition, the light color of the light source is controlled using the chromaticity of the image, so that the light color around the screen seen by the viewer and the chromaticity of the screen can have a sense of unity. A highly active viewing environment can be realized.

  In the present invention, the lighting device acquires image data of a moving image, and uses the acquired image data to convert an area with a small color difference between pixels constituting an image of a different frame into an area with less motion of the moving image. The chromaticity is calculated as follows. As a result, even if the image of a person or object with a relatively small area on the screen moves at high speed, the situation where the light color of the light source changes frequently due to the image of the moving person or object is suppressed. Thus, flickering of lighting can be prevented, and comfort and comfort can be improved. When the video scene changes to a different scene (scene), the chromaticity of the pixels in the screen after the scene changes after a minimum delay time (for example, a time corresponding to one frame) Since the light color of the light source can be controlled by using the light source, the light color of the light source changes following a large scene change, thereby enhancing the sense of presence, power, and activity.

In the present invention, the lighting device calculates the color difference of each pixel using the color information of each pixel constituting an image of a different frame, and identifies the pixel whose calculated color difference is smaller than a predetermined color difference threshold value. . Then, the chromaticity is calculated using the color information of the specified pixel. Different frames may use two consecutive frames, or may be two frames after thinning out one or more frames. For example, an RGB signal is used as pixel color information, and this RGB signal is converted into a CIE LAB (L ^* a ^* b ^* ) color system (L ^* is lightness, a ^* , b ^* are hue and saturation). Color difference ΔEab ^* is calculated using L ^* , a ^* , b ^* . A pixel whose color difference ΔEab ^* is a predetermined color difference threshold value (for example, 1.5) or less is specified. And it converts into RGB signal using the average value of the color information (for example, L ^* , a ^* , b ^* ) which the specified pixel has, the median value, the mode value, etc., and the color according to the converted RGB signal Calculate the degree. When the scene is changed by using the color difference of the pixel between different frames, the light color is changed following it to improve the sense of reality, power, and activity, and the image that moves quickly in the screen Therefore, it is possible to suppress a situation in which the light color of the light source frequently changes, prevent flickering of illumination, and improve comfort and comfort.

  In the present invention, the illumination device includes a light amount control means for controlling the light amount of the light source. For example, the user may set the light amount to a desired light amount, or when the light emitted from the light source is reflected by the reflecting surface, the luminance of the reflecting surface is detected and the detected luminance is detected. And a predetermined luminance threshold value, and the light quantity of the light source can be controlled according to the comparison result. Thereby, a light quantity can be set to a user's desired state, or a required fixed light quantity can be set, and comfort and comfort can further be improved.

  According to the present invention, it is possible to realize a viewing environment that is comfortable and enhances a sense of reality regardless of changes in the image of the image display device.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is an external perspective view of an illuminating device 100 according to the present invention, and FIG. 2 is an external front view of the illuminating device 100 according to the present invention. The illuminating device 100 is a metal (for example, aluminum) support for supporting the light source units 2 and 3 and the light source units 2 and 3 in which a plurality of light emitting diodes (hereinafter referred to as “LEDs”) are linearly arranged. Part 4 is provided.

  The support unit 4 has a rectangular cross-sectional shape and an appropriate length, and a rotating unit 5 having shafts (not shown) that pivotally support one ends of the light source units 2 and 3 at both ends thereof. 6 is provided. Thereby, the light source parts 2 and 3 are comprised so that rotation around the axis | shaft of the rotation parts 5 and 6 is possible. The rotating parts 5 and 6 have a predetermined frictional force so that the light source parts 2 and 3 are held at a desired angle. Note that a holding mechanism for stably holding the light source units 2 and 3 at a desired angle may be provided.

  Locking portions 7 and 8 are provided at the other ends of the light source portions 2 and 3. The locking portions 7 and 8 have a pair of fitting structures (not shown) including concave portions and convex portions on the surfaces facing each other, and the concave portions and the convex portions are fitted to each other, whereby the light source unit 2, 3 can be fixed to each other. By locking the locking portions 7 and 8 together, the light source portions 2 and 3 and the support portion 4 can be configured to form a substantially triangular shape. Note that the locking structure is not limited to the fitting structure composed of the concave portion and the convex portion, and may be a fitting structure of another shape or a structure locked by a magnetic body such as a magnet.

  In the substantially central portion of the support portion 4, an alternating voltage (for example, AC 100V) is converted into a predetermined direct current voltage, and the LEDs of the light source portions 2 and 3 are supplied to the LEDs in order to light up with the required brightness and color. A power supply control unit 10 incorporating a control circuit for controlling current is provided.

  Legs 12 and 13 for installing the lighting device 100 on the floor are fixed at positions separated from the central part of the support part 4 by an appropriate length. Each of the leg portions 12 and 13 has a U-shaped holding portion 14 sandwiching the supporting portion 4 and one end is fixed to the holding portion 14 and is attached to the supporting portion 4 at a predetermined angle. A leg main body 15 that supports the holding unit 14, and a stabilizer 16 that is provided at the other end of the leg main body 15 and has an appropriate weight so that the lighting device 100 stands up stably. A member (cover) that covers the support unit 4, the power supply control unit 10, and the like may be provided.

  In addition, for the user's preference, the size of the image display device, and the height adjustment of the light source units 2 and 3 from the floor surface, the angle formed by the leg body portions 15 of the leg portions 12 and 13 and the support portion 4 is It can also be configured so that the user can arbitrarily set it.

  In the vicinity of each triangular apex composed of the light source units 2 and 3 and the support unit 4, a light receiving unit 91 for detecting the luminance or luminance distribution of the wall surface (reflecting surface) around (backward) the image display device. , 92, 93 are arranged. Details of the light receiving units 91 to 93 will be described later.

  1 and 2 show an example in which the two light source units 2 and 3 and the support unit 4 form a triangular shape. However, the present invention is not limited to this, and a rectangular shape or a polygonal shape is used. There may be. Further, the number of light source units is not limited to two, and may be one or three or more. When one light source unit is provided, for example, a linear light source unit may be arranged behind the image display device and horizontally along the upper edge of the image display device. Moreover, when using three or more light source parts, each light source part can be comprised so that it may arrange | position in a substantially circular shape.

  FIG. 3 is an explanatory diagram showing an example of the configuration of the light source unit 2. In addition, since the light source part 3 also has the same structure, only the light source part 2 is demonstrated. The light source unit 2 includes a housing unit 21, a substrate 23 accommodated in the housing unit 21, and a plurality of LEDs 22 mounted on the substrate 23.

  The casing 21 is a frame made of aluminum having an appropriate length, and has a side surface that is open and accommodates the substrate 23 in the longitudinal direction. Thereby, the heat which generate | occur | produces in LED22 can be thermally radiated efficiently. The cross section on the opening side of the housing portion 21 has an inclined surface 211 and a bottom surface 212 with which the back surface of the substrate 23 abuts, and the substrate surface of the substrate 23 is predetermined in a state where the substrate 23 is fixed to the inclined surface 211. It arrange | positions so that the angle of may be made.

  For example, the angle formed between the inclined surface 211 and the bottom surface 212 is preferably approximately 30 degrees. When the inclination angle of the inclined surface 211 is small and substantially the same surface as the bottom surface 212, light from the LED 22 is irradiated in a direction substantially parallel to the rear wall surface of the image display device. (Luminance) decreases. Further, when the inclined surface 211 has a large inclination angle and is substantially perpendicular to the bottom surface 212, the light from the LED 22 is irradiated in a direction substantially perpendicular to the rear wall surface of the image display device, and immediately after the image display device. This is because only the wall surface is irradiated, and the illuminance (luminance) of the wall surface around the rear of the image display device decreases. Therefore, an appropriate angle is required for the light from the LED 22 to be efficiently applied to the rear wall surface of the image display device. In addition, it is preferable to set the height of the bottom surface 212 so that the light emitted from the LED 22 is not blocked by the casing unit 21 itself.

  The substrate 23 is, for example, a glass epoxy substrate, and mounted with mounting components such as a resistance element and a connector (all not shown) in addition to the plurality of LEDs 22. In addition, it is desirable that the portion of the surface of the substrate 23 where the mounting components such as the LED 22 are not mounted is white so that the light emitted from the LED 22 is not absorbed by the substrate 23.

  The LED 22 is, for example, a surface-mount package LED in which three color LED elements, a red (R) LED element, a blue (B) LED element, and a green (G) LED element, are packaged. The light emission intensity of each LED element of RGB can be controlled, and the LED can irradiate a plurality of colors by adjusting the light emission intensity (luminance) of the LED elements of each color. As a result, the periphery (such as the rear wall surface) of the image display apparatus can be illuminated with the required light color and light quantity. The LED 22 is not a package LED composed of RGB LED elements, but is an LED chip for each color of RGB, and may have a configuration in which LED chips for each color of RGB are arranged in the light source unit.

  The light source is not limited to the LED, and other light sources such as a fluorescent lamp or a cold cathode tube may be used. However, since the LED has high directivity, the peripheral wall surface of the image display apparatus can be efficiently irradiated, and the irradiation direction can be easily controlled. In addition, when using the light source which is not directional and is irradiated to all directions like a fluorescent lamp, it is preferable to provide the reflection member which reflects the light irradiated inside the light source part 2. FIG.

  In the example of FIG. 3, the light source unit 2 is configured to accommodate one substrate 23, but is not limited thereto, and may be configured to accommodate two or more substrates. Even if the LED on the substrate fails, it is only necessary to replace the substrate on which the failed LED is mounted, and the cost for replacement can be reduced.

  In addition, by further reducing the dimensions of the plurality of substrates and separating the substrates from each other, the number of LEDs mounted near the center of the light source units 2 and 3 can be reduced, and the cost of the entire lighting device can be reduced. It is possible to lower. As shown in FIG. 2, when the lighting device 100 is configured so that the light source units 2 and 3 form two sides of a triangle, when the lighting device 100 is disposed behind (back side) the image display device, the light source unit Since the portions where the LEDs near the center of the two or three are not mounted are located away from the peripheral edge of the image display device, the upper and left peripheral wall surfaces of the image display device screen are viewed from the viewer. The influence on the illuminance (brightness) is small, and a lighting environment (light environment) for giving an indirect lighting effect (realism) to the viewer can be sufficiently secured.

  Further, a transparent cover made of synthetic resin may be provided to protect the substrate 23 on which the LEDs 22 are mounted. Further, the cover may include a diffusion filter for diffusing light emitted from the LED 22. Thereby, the light of LED22 with high directivity can be diffused, and the brightness distribution of the wall surface behind the image display device can be made smooth.

  FIG. 4 is an explanatory view showing an installation example of the illumination device 100 according to the present invention. As shown in FIG. 4, the illumination device 100 is installed behind the image display device and between the image display device and the rear wall surface (reflection surface). With the illumination device 100 installed, the light source unit 3 is configured to irradiate a wall surface behind the image display device. The same applies to the light source unit 2 (not shown).

  FIG. 5 is a block diagram showing an example of the configuration of the illumination device 100 according to the present invention. As shown in FIG. 5, the illumination device 100 includes a light source control unit 51, a data comparison unit 52, an input signal reception unit 53, and moving image image data, in addition to the light receiving units 91 to 93 and the light source units 2 and 3 described above. A video data input unit 54 as an acquisition unit, a color difference calculation unit 55 as a color difference calculation unit, a pixel specification unit 56 as a specification unit, a chromaticity calculation unit 57 as a chromaticity calculation unit, and the like. A light amount control unit 511 as a light amount control unit, a light color control unit 512 as a light color control unit, and the like.

  The light receiving unit 91 includes a photosensor (not shown). The photosensor is a photoelectric conversion element having sensitivity at least in the visible light wavelength region, for example, an element such as a CdS cell, a photodiode, or a phototransistor, and a reflection surface on which light emitted from the LEDs 22 of the light source units 2 and 3 is reflected. The luminance of the (wall surface) can be detected. The light receiving parts 92 and 93 have the same configuration as the light receiving part 91.

  The input signal receiving unit 53 receives, for example, an input signal transmitted by a remote controller (not shown) carried by the user, and outputs the received input signal to the light source control unit 51. As an input signal, for example, an illumination on / off signal for turning on / off the illumination of the illumination device 100, a sensor on / off for controlling whether the light receiving unit 91 detects the brightness of the reflecting surface (wall surface), or the like. It includes a signal, an illumination setting signal for the user to set a desired amount of luminance, luminance distribution, chromaticity, etc. of the illumination device 100. Note that, as a configuration in which an operation unit corresponding to a remote controller is provided in the lighting device 100 main body, an input signal may be acquired from the operation unit by wire.

  When the input signal includes a sensor-on signal, the data comparison unit 52 is obtained by detecting the luminance or luminance distribution of the reflection surface (wall surface) with the light receiving units 91 to 93 under the control of the light source control unit 51. The optical information S is compared with the optical information T stored in advance. The data comparison unit 52 outputs the comparison result to the light source control unit 51. The optical information S, T includes information such as luminance and luminance distribution. The optical information T stored in advance in the data comparison unit 52 can be optical information on the wall surface when the image display device and the lighting device are installed at a predetermined position in front of the ideal wall surface.

  The light quantity control unit 511 increases or decreases the light quantity of the light source units 2 and 3 according to the input comparison result. In this process, the light sources 2 and 3 emit light until the light information S and the light information T satisfy a predetermined matching condition (for example, a state where the difference between the light information S and T falls within a predetermined range). By repeating the adjustment, it is possible to realize the lighting device 100 that can support various installation locations.

  Depending on the environment in which the image display device is installed, the brightness and brightness distribution of the wall surface may be extremely different from the normal case. In such a case, the brightness and brightness distribution of the wall surface are desired. Since a situation that cannot be adjusted within the range can occur, it is necessary to notify the viewer of some kind of warning.

  The video data input unit 54 receives, as an image data of a moving image from a device such as an image display device, for example, an RGB signal as color information of each pixel constituting a frame image at a predetermined frame rate (30 frames per second). To get. The RGB signal is output from the image display device in units of frames. The video data input unit 54 outputs the acquired RGB signal to the color difference calculation unit 55 in units of frames. The moving image includes not only the case where 30 frames of images are sequentially displayed per second, but also the case where still images are displayed at a relatively long time interval (for example, twice per second). .

The color difference calculation unit 55 includes an image memory for two frames, and calculates the color difference of each pixel between two different frames. The calculation of the color difference is performed by, for example, converting an RGB signal into a CIE LAB (L ^* a ^* b ^* ) color system (L ^* is lightness, a ^* and b ^* are amounts related to hue and saturation), and conversion. The color difference ΔEab ^* is calculated using the later L ^* , a ^* , and b ^* . Here, the color difference ΔEab ^* can be obtained by squaring and summing L ^* , a ^* , and b ^* , respectively, and calculating the half of the sum. The color difference may be a value obtained in the Lab color solid color system instead of the L ^* a ^* b ^* color solid color system. As described above, since the image memory only needs to have data for two frames, it can be realized with a small memory capacity. Furthermore, in the case where the input video data has a format capable of sequentially acquiring data for each pixel (for example, a video signal input from an antenna to an image display device such as a television), for each pixel. It is possible to obtain the data sequentially and compare with the corresponding pixel data in the previous frame image stored in the memory. By replacing the data, the image memory can be composed of only one frame. Also, the color difference can be calculated in units of frames. For example, when a moving image is composed of 30 frames per second, the color difference of each pixel constituting the image can be calculated 30 times per second. Note that two different frames may be used for different imaging time points, or two frames after thinning out one or a plurality of frames may be used.

  FIG. 6 is an explanatory diagram illustrating an example of calculating the color difference of a pixel. 6A shows an image of frame (n−1) (image of the previous frame), and FIG. 6B shows an image of frame (n) (image of the current frame). As shown in FIG. 6, the color difference of each pixel is calculated based on the color information (for example, RGB value) of the pixel (i, j) having the same coordinates between different frames. Similar processing is performed for all the pixels in the frame. After calculating the pixel color difference for all the pixels in one frame, the same processing is repeated for the pixels in the next frame.

  The pixel specifying unit 56 specifies pixels whose color difference calculated by the color difference calculating unit 55 is smaller than a predetermined color difference threshold. More specifically, the pixel specifying unit 56 counts the number of pixels having the same color difference based on the color difference of each pixel, and obtains the color difference distribution of all the pixels in one frame.

FIG. 7 is an explanatory diagram showing an example of a pixel specifying method. In FIG. 7, the horizontal axis indicates the color difference, and the vertical axis indicates the frequency (number of pixels). As shown in FIG. 7, the pixel specifying unit 56 specifies a pixel having a color difference smaller than a predetermined color difference threshold (for example, color difference ≦ 1.5) from the color difference distribution of all the pixels in one frame. It should be noted that when the color difference ΔEab ^* is in the range of 0 to 1.5, the color change is slight and almost indistinguishable ^{. When} the color difference ΔEab ^* is in the range of 1.5 to 3.0, the color change is detected. If the color difference ΔEab ^* is 3.0 or more, the color change can be sufficiently recognized. Therefore, by using 1.5 as the color difference threshold, it is possible to calculate chromaticity using a pixel in a region where the color difference of the pixel is small, that is, a region where the motion of the moving image is small, in one frame image. Other values can be used for the color difference threshold.

Chroma calculating unit 57, L ^* as a color information of each pixel color difference is smaller than the color difference threshold value, a ^*, with ^{b *, L *, a *} , b * and calculates the respective average values were calculated The average value is converted into an RGB value to calculate chromaticity. In place of the average value, a median value or a mode value may be used.

  The light color control unit 512 controls the light color of the light source units 2 and 3 using the chromaticity calculated by the chromaticity calculation unit 57. For example, when the calculated chromaticity is relatively large, the light color of the light source units 2 and 3 is changed to a cold color according to the chromaticity, and when the calculated chromaticity is relatively small, the light source unit A few light colors are changed to warm colors according to the chromaticity. Thereby, the light color of the light source parts 2 and 3 can be controlled according to the calculated chromaticity every time an image of one frame is displayed. Note that the light amount and the light color can be independently controlled by separately providing the light amount control unit 511 and the light color control unit 512.

  As described above, in the present embodiment, the color of a region with little movement or a region with little change (a set of pixels having a small color difference) between different frames of a moving image displayed on the screen of the image display device. Information is extracted, chromaticity is calculated using the extracted color information, and the light color of the light source is controlled. In this way, it is possible to realize the illumination light control of the image interlocking method interlocking with the change of the image.

  8, 9 and 10 are explanatory diagrams showing an outline of the video interlocking system. FIG. 8 shows an image of the previous frame. The previous frame is, for example, a frame at the time of imaging immediately before the current frame. As shown in FIG. 8, it is assumed that a pink image (such as a person or an object) appears on the screen from the right side at the time of the previous frame. 9 and 10 show images of the current frame. As shown in FIGS. 9 and 10, it is assumed that the pink video that appears at the time of the previous frame has moved to the center of the screen at the time of the current frame. FIG. 9 is an example for comparison with the present invention, and shows a case of a conventional example (for example, a method of controlling the light color of the light source using the average color of the pixels of the entire screen). FIG. 10 illustrates the state obtained by the present invention.

  As shown in FIG. 9, in the conventional method, the average color of the pixels on the entire screen approaches pink due to the influence of the pink image suddenly projected on the screen. For this reason, the illumination around the back surface of the image display device changes to light pink as a whole. In this way, the light color of the light source changes due to the influence of video content that changes quickly in the screen, causing flickering and the like, resulting in a decrease in comfort and comfort.

  On the other hand, as shown in FIG. 10, in the case of the present invention, the light source is controlled with the light color corresponding to the chromaticity of the region where the motion of the video content (for example, the pink video in the figure) is small. As a method of detecting an area where there is little movement of video content, a color difference is calculated for each pixel in the previous frame image and the current frame image, and the chromaticity of the pixel area where the calculated color difference is smaller than a predetermined color difference threshold is averaged. Therefore, it is not easily affected by changes in video content that are too fine and too fast, and does not reduce comfort and comfort due to flicker and the like. Also, for large scene changes where the image on the entire screen changes, the light source is controlled by the light color according to the chromaticity of the area where there is little movement between the two frames after the scene change, so the image after the scene change The light color can be changed according to the situation, and the presence, power, and activity can be maintained or enhanced. As described above, according to the video interlocking system of the present invention, it is possible to maintain comfort and comfort, and to realize a viewing environment with high presence, power, and activity.

  Next, operation | movement of the illuminating device 100 which concerns on this invention is demonstrated. 11 and 12 are flowcharts showing the processing procedure of the illumination device 100. The light source control unit 51 determines whether or not an illumination on signal has been received (S11). If the illumination on signal has not been received (NO in S11), the process of step S11 is continued.

  When the illumination on signal is received (YES in S11), the light source control unit 51 acquires light emission data (S12), generates light source control data corresponding to the acquired light emission data (S13), and turns on the light source ( S14). As the light emission data, a predetermined initial value or a value set by the user can be used.

  The light source control unit 51 determines whether or not a sensor-on signal has been received (S15). When the sensor-on signal is received (YES in S15), the light source control unit 51 detects the brightness of the reflecting surface (wall surface) (S16). The light source control unit 51 compares the detected luminance with a predetermined luminance threshold (S17). Here, the luminance threshold is a threshold for the luminance of the reflecting surface.

  The light source control unit 51 controls the light amount of the light source units 2 and 3 according to the comparison result (S18). When the sensor-on signal is not received (NO in S15), the light source control unit 51 performs the process of step S19 described later without performing the processes of steps S16 to S18.

  The light source control unit 51 determines whether or not video data (image data) has been acquired (S19). If video data has been acquired (YES in S19), the color difference of each pixel between different frames is calculated (S20). ). The light source control unit 51 determines whether or not the processing has been completed for all the pixels in the frame (S21). If the processing has not been completed for all the pixels (NO in S21), the processing after step S20 is performed. to continue.

  When the processing of all the pixels is completed (YES in S21), the light source control unit 51 identifies a pixel whose calculated color difference is smaller than the color difference threshold (S22) and determines whether there is a specified pixel (S23). ). If there is no identified pixel (NO in S23), the light source control unit 41 continues the processing from step S19, and if there is a identified pixel (YES in S23), calculates the chromaticity of the identified pixel (S24). . In this case, the calculation of chromaticity may be an average value, or may be a median value or a mode value. The light source control unit 51 controls the light color according to the calculated chromaticity (S25). When the video data has not been acquired (NO in S19), the light source control unit 51 performs the process of step S26 described later without performing the processes of steps S20 to S25.

  The light source control unit 51 determines whether or not an illumination off signal has been received (S26). If no illumination off signal has been received (NO in S26), the processing after step S15 is continued to receive the illumination off signal. If so (YES in S26), the light source is turned off (S27), and the process ends.

  In addition, when there is no pixel specified in step S23 described above (nothing exists), for example, the entire screen changes from blue to red, and a pixel having a color difference threshold value (for example, 1.5) or less. This is a case where there are no pixels that satisfy that condition. In such an extreme screen change (scene change), chromaticity calculation and light color control are not performed, and the light color at that time is maintained. Thereby, the influence by an extreme scene change can be prevented.

  Next, the evaluation result by the illuminating device 100 of this invention is demonstrated. FIGS. 13, 14, 15, 16, 16, 17, 19, and 20 are schematic diagrams showing examples of video content. In each figure, images are extracted every 5 frames, and the numbers in the figures indicate frame numbers. The number increases with time. Moreover, the figure in a figure represents typically images, such as a person and an object.

  FIG. 13 shows the transition of the video from frame 01 to 46, where the camera is fixed and the motion of the video content is small. Also, the left rectangular image in the figure is dark blue, and the right rectangular image is light green.

  FIG. 14 shows the transition of the image from frame 51 to 86, the camera is zoomed in, and the image of the background lawn (eg yellow green) disappears from the screen. The rectangular image in the figure is amber.

  FIG. 15 shows the transition of the images from frames 91 to 116, and shows a state in which the camera is fixed and a blue-violet image intrudes in front of the amber image.

  FIG. 16 shows the transition of the images from frames 121 to 156, and shows a state where a scene change (scene change) is largely performed, the background is almost constant after the scene change, and the image follows the pink image.

  FIG. 17 shows the transition of the image from frames 161 to 186, and shows a state where the lawn disappears by performing a sudden zoom-in on the pink image.

  FIG. 18 shows the transition of the images from frames 191 to 231 and shows a state in which the background is substantially constant and the zoomed-in pink image is followed.

  FIG. 19 shows the transition of images from frames 236 to 256, and shows a state in which a scene change has been performed largely, the background is almost constant after the scene change, and the image follows a yellow-green image.

  FIG. 20 shows the transition of the images from frames 261 to 296, showing a state in which the background is almost constant, a blue-violet image passes in front of the yellow-green image, and follows the yellow-green image. .

  21 and 22 are explanatory diagrams showing chromaticity evaluation results by the illumination device 100 according to the present invention. The evaluation results shown in FIGS. 21 and 22 are for the video content shown in FIGS. 13 to 20 described above. In FIG. 21, the horizontal axis indicates the number of frames, and the vertical axis indicates CIE 1976 UCS chromaticity coordinate u ′. In FIG. 22, the horizontal axis represents the number of frames, and the vertical axis represents v ′ of CIE 1976 UCS chromaticity coordinates. 21 and 22, the data indicated by black circles indicate the evaluation results obtained by the video interlocking method according to the present invention, and the data indicated by triangles is an image for each frame image as a comparative example (conventional example). The average chromaticity of the whole is shown.

  As shown in FIG. 21, in the case of the conventional example, the chromaticity u ′ fluctuates under the influence of the scene change in the frames 121 to 156. Further, the chromaticity u ′ fluctuates under the influence of the sudden zoom-in in the frames 161 to 186. Further, the chromaticity u ′ fluctuates due to the influence of the motion of the pink image in the frames 191 to 231. Further, the chromaticity u ′ fluctuates under the influence of the scene change in the frames 236 to 256. Further, the chromaticity u ′ fluctuates due to the influence of the motion of the blue-violet image in the frames 261 to 296. Thus, in the conventional example, it can be seen that the chromaticity fluctuates due to a fast moving image or the like.

  On the other hand, as shown in FIG. 21, according to the present invention, although the chromaticity u ′ fluctuates due to the movement of the pink image in the frames 191 to 231, it returns to the original state in a short time. Also, it can be seen that when there is a large scene change, the light color changes following the change, but is not easily affected by the fast moving image.

  Further, as shown in FIG. 22, in the case of the conventional example, the chromaticity v ′ fluctuates due to the intrusion of the blue-violet video in the frames 91 to 116. Further, the chromaticity v ′ varies under the influence of the scene change in the frames 121 to 156. Further, the chromaticity v ′ fluctuates under the influence of the sudden zoom-in in the frames 161 to 186. Further, the chromaticity v ′ fluctuates under the influence of the scene change in the frames 236 to 256 and the influence of the change of the tracking target. Further, the chromaticity v ′ fluctuates due to the influence of the motion of the blue-violet video in the frames 261 to 296. Thus, in the conventional example, it can be seen that the chromaticity fluctuates due to a fast moving image or the like.

  On the other hand, as shown in FIG. 22, according to the present invention, although the chromaticity v ′ fluctuates due to the influence of the background change due to the scene change in the frames 121 to 156, the light color matches the color of the background. Since it has continued for a relatively long period of time, it can increase the sense of reality. It can also be seen that it is not easily affected by fast moving images.

  Next, the evaluation result about the back lighting of the image display device will be described. FIG. 23 is a schematic diagram illustrating an example of a viewing environment for evaluation, FIG. 24 is an explanatory diagram illustrating an example of an evaluation word, and FIGS. 25 and 26 are explanatory diagrams illustrating an example of an illumination evaluation result. As shown in FIG. 23, a 52-inch liquid crystal television is used as the image display device, and the lighting device 100 according to the present invention is installed between the liquid crystal television and the wall surface. In addition, seats for a plurality of (for example, three) viewers (subjects) are provided at positions separated from the liquid crystal television by a predetermined distance. In the figure, H is the vertical dimension of the screen of the image display device. Further, evaluation was performed by preparing in advance a sheet on which an evaluation word as shown in FIG. 24 is written, and letting the viewers view a predetermined video and entering their impressions. After the results are quantified, factor analysis is performed to calculate the factor load for each evaluation word. The factor of comfort / comfort and the factor of presence / power / activity are divided into two aspects: Evaluation was performed. Note that the video to be shown to the viewer can be determined as appropriate.

  As shown in FIG. 25, it can be seen that when the backlight is applied, the comfort and comfort are improved as compared with the case where there is no illumination. It can also be seen that the presence, power, and activity are enhanced in the case of only the backlighting, compared to the case of only the ceiling lighting or the combination of the ceiling lighting and the backlighting.

  In addition, as shown in FIG. 26, in the case of only the back illumination, the light color of the illumination is in the screen as compared with the case where illumination is performed with a constant light color such as light red, light green, light blue, and white. It can be seen that illuminating with a light color corresponding to the color of the image improves comfort, comfort, presence, power, and activity.

  As described above, according to the present invention, it is possible to prevent the light color of the light source from changing frequently even when the image of a person or an object frequently changes in the screen of the image display device. Can keep comfort and comfort. In addition, the light color of the light source is controlled using the chromaticity of the image, so that the light color around the screen viewed from the viewer and the chromaticity of the screen can have a sense of unity. A highly active viewing environment can be realized.

  In addition, even when the image of a person or object with a relatively small area on the screen moves at high speed, the situation where the light color of the light source changes frequently due to the image of the moving person or object is suppressed. Thus, flickering of lighting can be prevented, and comfort and comfort can be improved. When the video scene changes to a different scene (scene), the chromaticity of the pixels in the screen after the scene changes after a minimum delay time (for example, a time corresponding to one frame) Since the light color of the light source can be controlled by using the light source, the light color of the light source changes following a large scene change, thereby enhancing the sense of presence, power, and activity.

  In addition, when the scene is changed by using the color difference of the pixel between different frames, the light color is changed following it to improve the sense of reality, power and activity, and move quickly in the screen The situation in which the light color of the light source frequently changes due to the image to be played can be suppressed, flickering of the lighting can be prevented, and comfort and comfort can be improved.

  In addition, since the amount of light can be controlled independently of the light color, the amount of light can be set to the user's desired state, or the required constant amount of light can be set, so the change in the amount of light can It is possible to further improve comfort and comfort without being affected by the above.

In the above-described embodiment, the color difference ΔEab ^* is calculated by converting the RGB color information into L ^* , a ^* , and b ^*, and the pixel having the calculated color difference smaller than a predetermined color difference threshold is specified. However, the present invention is not limited to this, and in the CIE 1976 UCS chromaticity coordinates (u ′, v ′), a pixel whose distance between the coordinates is smaller than a predetermined threshold value may be specified.

  In the above-described embodiment, the configuration using the LED as the light source has been described. However, the light source is not limited to the LED, and the change in the light color can be controlled following the frame rate of the moving image. Other light sources can be used if present. If the frame rate is too high for the light source, one or a plurality of frames may be thinned out to make the light source followable by artificially slowing down the frame rate.

It is an external appearance perspective view of the illuminating device which concerns on this invention. It is an external appearance front view of the illuminating device which concerns on this invention. It is explanatory drawing which shows an example of a structure of a light source part. It is explanatory drawing which shows the example of installation of the illuminating device which concerns on this invention. It is a block diagram which shows an example of a structure of the illuminating device which concerns on this invention. It is explanatory drawing which shows the example of calculation of the color difference of a pixel. It is explanatory drawing which shows an example of the identification method of a pixel. It is explanatory drawing which shows the outline | summary of a video interlocking | linkage system. It is explanatory drawing which shows the outline | summary of a video interlocking | linkage system. It is explanatory drawing which shows the outline | summary of a video interlocking | linkage system. It is a flowchart which shows the process sequence of an illuminating device. It is a flowchart which shows the process sequence of an illuminating device. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is a schematic diagram which shows an example of a video content. It is explanatory drawing which shows the chromaticity evaluation result by the illuminating device which concerns on this invention. It is explanatory drawing which shows the chromaticity evaluation result by the illuminating device which concerns on this invention. It is a schematic diagram which shows an example of the viewing-and-listening environment for evaluation. It is explanatory drawing which shows an example of an evaluation word. It is explanatory drawing which shows an example of an illumination evaluation result. It is explanatory drawing which shows an example of an illumination evaluation result.

Explanation of symbols

2, 3 Light source unit 51 Light source control unit 511 Light amount control unit 512 Light color control unit 52 Data comparison unit 53 Input signal reception unit 54 Video data input unit 55 Color difference calculation unit 56 Pixel identification unit 57 Chromaticity calculation units 91, 92, 93 Light receiving section

Claims (4)

In an illumination device that includes a light source and illuminates the periphery of the image display device,
Light color control means for controlling the light color of the light source;
Chromaticity calculating means for calculating the chromaticity of a region where the motion of the moving image displayed on the image display device is small, and
The light color control means includes
An illuminating device configured to control a light color of a light source according to chromaticity calculated by the chromaticity calculating means. An acquisition means for acquiring image data of a moving image displayed on the image display device;
The chromaticity calculation means includes
Using the image data acquired by the acquisition means, the chromaticity is calculated such that an area having a small color difference between pixels constituting an image of a different frame is regarded as an area having little motion of the moving image. The lighting device according to claim 1. Color difference calculating means for calculating the color difference of each pixel using color information of each pixel constituting an image of a different frame;
Specifying means for specifying a pixel whose color difference calculated by the color difference calculating means is smaller than a predetermined color difference threshold;
The chromaticity calculation means includes
The illuminating device according to claim 2, wherein chromaticity is calculated using color information of a pixel specified by the specifying means.   The illumination device according to any one of claims 1 to 3, further comprising a light amount control unit that controls a light amount of the light source.

Images