JP2009276702A - Image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus that changes an image desirably viewed by a user into an appropriate brightness, and also changes images other than that into the appropriate brightness. <P>SOLUTION: The image display apparatus includes a first image analysis means 1 for analyzing a first feature value about each of a plurality of image data A, B. The apparatus includes: an image compounding ratio processing means 3 for determining a compounding ratio of luminance on the basis of the feature value of one image data A selected by the user among the image data A, B; and an image processing means 4 for processing to change the luminance of the one image data A on the basis of the compounding ratio determined by the image compounding ratio processing means 3. Also, the apparatus includes: a second image analysis means 6 for analyzing a second feature value of the image data obtained by synthesizing one image data A processed by the image processing means 4 with the image data B other than the one image data; and a luminance information decision means 7 for determining the luminance of a plurality of image data A, B displayed on one picture on the basis of the second feature value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image display device, and more particularly to an image display device that displays a plurality of images simultaneously on one screen.

  In recent years, products having multiple functions are increasing in digital televisions and mobile terminals, and accordingly, the necessity of simultaneously displaying images for each function on one screen is increasing. In view of this, an image display apparatus that displays a plurality of images on one screen, for example, by a multi-window has been proposed.

  In the invention described in Patent Document 1, the brightness of a window is controlled by controlling brightness according to a specific brightness standard such as the brightness of the image of the brightest window among the plurality of windows or the overall average brightness level. Matches the brightness of the image. Further, in the invention described in Patent Document 2, the brightness of the entire screen is adjusted based on the amount of light of the entire image, the monitoring environment condition, and the condition of the monitor to realize an easy-to-see display.

JP 2001-175217 A JP 2007-279405 A

  However, the brightness of the image of one window in the conventional image display device is not necessarily adjusted in consideration of the brightness of the image. For example, if the images of one window are dark but the images of the other windows are bright, the entire screen is darkened so that the images of the windows are easy to see. As a result, the dark image in one window becomes darker. Therefore, there is a problem that even if the user wants to see the image, it may be dark and difficult to see.

  The present invention has been made to solve the above-described problems, and changes an image that a user wants to see to an appropriate brightness, and other images can also be changed to an appropriate brightness. An object is to provide a display device.

  An image display device according to the present invention is an image display device that displays an image of a plurality of image data on a single screen, and a first image analysis unit that analyzes a first feature amount for each of the plurality of image data. Is provided. And ratio determining means for determining a blending ratio of luminance based on the first feature amount analyzed by the first image analyzing means for one image data selected by the user among the plurality of image data And image processing means for performing a process of changing the luminance of the one image data based on the blending ratio determined by the ratio determining means. Then, second image analysis means for analyzing a second feature amount of image data obtained by combining the one image data processed by the image processing means and the plurality of image data other than the one image data. And luminance determining means for determining the luminance of the plurality of image data displayed on the one screen based on the second feature amount analyzed by the second image analyzing means.

  According to the image display device of the present invention, the brightness of one piece of image data selected by the user is automatically changed based on the first feature amount of the image data. It can be seen with high brightness. In addition, the luminance of the plurality of image data is determined based on the second feature amount of the image data obtained by combining the one image data whose luminance is changed and the other image data. Thereby, since the image of the image data not selected by the user is automatically changed, the user can view an image other than the desired image with appropriate brightness.

<Embodiment 1>
FIG. 1 is a block diagram showing a configuration of an image display apparatus according to the present embodiment. As shown in FIG. 1, the image display apparatus according to the present embodiment includes a first image analysis means 1, an image selection means 2, an image blending ratio processing means 3, an image processing means 4, and an image composition means. 5, a second image analysis unit 6, a luminance information determination unit 7, and a display panel drive unit 8. The display panel 9 consists of one screen. In the present embodiment, the image display device displays a plurality of image data images on one screen of the display panel 9. In the present embodiment, a plurality of image data are described as being two pieces of image data A and B input to the image analysis means 1.

  The first image analysis unit 1 according to the present embodiment analyzes the first feature amount for each of the plurality of input image data A and B. The first feature amount according to the present embodiment is a luminance level, an image area, a luminance distribution, a luminance histogram, a color distribution, and a color histogram for each of the plurality of image data A and B. The first image analysis unit 1 outputs the first feature amount of the image data A and B together with the image data A and B to the image selection unit 2.

  The image selection means 2 performs a process of selecting one image data from the image data A and B based on the selection by the user. Hereinafter, one image data selected by the image selection means 2 will be described as being image data A. However, even for image data B, the following operations are substantially the same. The image selection means 2 outputs the first feature amount of one image data A to the image blending ratio processing means 3 and outputs the image data A to the image processing means 4. Further, the image selection means 2 outputs image data B other than the one image data A selected by the user to the image composition means 5.

  The image blending ratio processing means 3 determines the brightness blending ratio based on the first feature amount analyzed by the first image analyzing means 1 for one image data A. In other words, the image blending ratio processing means 3 that is the ratio determining means according to the present embodiment is the first image analysis means for one image data A selected by the user from among the plurality of image data A and B. Based on the first feature value analyzed in step 1, the luminance blending ratio is determined. In the present embodiment, the blending ratio determined by the image blending ratio processing means 3 (hereinafter sometimes referred to as an image blending ratio) can be finely adjusted by the user.

  The image processing unit 4 according to the present embodiment performs a process of changing the luminance of one image data A based on the image blending ratio determined by the image blending ratio processing unit 3. In the present embodiment, the image processing unit 4 performs a process of changing the brightness of white among a plurality of types of colors of image data. Thereby, the brightness of the image when the image data A is displayed is changed to an arbitrary brightness between the attenuation rate of 100% and the amplification rate of 100%. The image of the image data A is displayed in black when the attenuation factor is changed to 100%, and is displayed in white when the amplification factor is changed to 100%.

  The image composition means 5 receives one image data A from the image processing means 4, and receives image data B other than the one image data A from the image selection means 2. The image synthesizing unit 5 synthesizes the image data A and the image data B, generates synthesized image data C, and outputs the synthesized image data C to the second image analyzing unit 6. The second image analysis unit 6 according to the present embodiment is a combination of one image data A processed by the image processing unit 4 and image data B other than the one image data A. The second feature amount is analyzed. The second feature amount according to the present embodiment is the luminance of the combined image data C obtained by combining the one image data A processed by the image processing unit 4 and the image data B other than the one image data A, For example, the average luminance level.

  The luminance information determining unit 7 as the luminance determining unit according to the present embodiment is based on the average luminance level analyzed by the second image analyzing unit 6 and all the plurality of image data displayed on the screen of the display panel 9. The brightness of A and B is determined. In the present embodiment, the luminance information determining means 7 determines the luminance of all the image data A and B displayed on the screen of the display panel 9 by referring to the monitoring condition from the outside in addition to the average luminance level. To do. The monitoring conditions here include, for example, conditions relating to the lighting environment of the display panel 9, the age of the user, and the monitoring distance between the user and the display panel 9. The luminance information determination unit 7 outputs the determined luminance (sometimes referred to as a display luminance determination value) to the display panel drive unit 8.

  The display panel drive unit 8 drives the screen of the display panel 9 based on the output from the luminance information determination means 7, that is, the display luminance determination value, and controls the brightness of the entire screen of the display panel 9. As described above, the display panel drive unit 8 determines the brightness of the images of all the plurality of image data A and B displayed on the screen of the display panel 9 based on the display brightness determination value determined by the brightness information determination unit 7. To control.

  Here, it is assumed that the image display device having the above configuration is provided in a mobile phone, and the user wants to view a text image such as an email while displaying a moving image on the mobile phone. In this case, if the luminance level of the moving image area is increased or the luminance level of the text image area is decreased, an easily visible image can be displayed on the mobile phone in either area.

  According to the image display device according to the present embodiment as described above, the brightness of one image data A selected by the user among the plurality of image data A and B is automatically based on the first feature amount. Therefore, the user can view a desired image with appropriate brightness. In addition, the brightness of all the plurality of image data A and B displayed on the screen of the display panel 9 is the composite image data C obtained by combining one image data A with the changed brightness and the other image data B. It is determined based on the second feature amount. Thus, the image of the image data B that has not been selected is also automatically changed, so that the user can view images other than the desired image with appropriate brightness. In addition, when an image of the amplified video signal is displayed on a display having a backlight such as a liquid crystal panel, the luminance of the backlight is lowered by the above image processing, and thus there is a case where the effect of low power consumption is obtained. is there. Further, since it is not necessary to analyze the luminance for each image, the above-described operation can be realized with a small amount of analysis even when the number of images of the image data is large.

  Further, according to the image display device according to the present embodiment, the user can finely adjust the image blending ratio determined by the image blending ratio processing means 3. Therefore, when the brightness of the selected image deviates from the brightness desired by the user, the user can obtain the desired brightness. Note that the image blending ratio may be changed by the user when an image is selected, or may be set and changed by the user while viewing the displayed image.

  In addition, although the case where the plurality of image data according to the present embodiment is two of the image data A and B has been described, the present invention is not limited to this and may be a plurality of image data of two or more. . Even in this case, the user can view the desired image with appropriate brightness by the brightness changing process by the image processing unit 4, and the user can view an image other than the desired image by determining the brightness by the brightness information determining unit 7. It can be seen with appropriate brightness.

  In the above, the change in the brightness of the images of the plurality of image data, that is, the change in the brightness of white has been described. However, for example, if the image you want to see is a green soccer image and the image displayed in the other window is a red image, changing the white color of the soccer image will Gives discomfort. Therefore, the luminance change described above may be a method in which a combination of specific colors is detected, and a luminance attenuation factor or amplification factor of a specific color other than white is changed accordingly.

<Embodiment 2>
FIG. 2 is a block diagram showing the configuration of the image display apparatus according to this embodiment. As shown in FIG. 2, the image display apparatus according to the present embodiment further includes a temporal change setting means 10 that is a setting means in addition to the configuration of the first embodiment. Of the configurations of the image display apparatus according to the following embodiments, the same components as those of the first embodiment are denoted by the same reference numerals, and the components not newly described are the same as those of the first embodiment. Shall.

  The temporal change setting means 10 which is a setting means according to the present embodiment sets a predetermined time. In the present embodiment, the predetermined time is assumed to be a time constant. The temporal change setting means 10 outputs the time constant set in the image processing means 4 after the blending ratio is determined by the image blending ratio processing means 3. The image processing means 4 naturally relaxes the change in luminance of one image data A according to the time constant set by the time-dependent change setting means 10. In the present embodiment, the image processing unit 4 relaxes the change in the luminance of the one image data A by causing the change in the luminance of the one image data A to change over time.

  In addition, the luminance information determination unit 7 according to the present embodiment reduces the luminance change of the plurality of image data according to the time constant set by the temporal change setting unit 10, and the plurality of image data A, B Determine the brightness. In the present embodiment, the luminance information determination unit 7 relaxes the change in the luminance of the image data A and B by causing the luminance change of the image data A and B to change with time. In the temporal change setting means 10, when the time constant is 0, the above-mentioned temporal change may be eliminated and the luminance may be changed based on the image blending ratio itself.

  In the image display apparatus according to the present embodiment having the above-described configuration, the image processing unit 4 can arbitrarily change the luminance of one image data A based on the time constant output from the temporal change setting unit 10. Image processing that changes with time is performed. Thereby, when the image of one image data A is an image in which luminance change, color change, area change, etc. are frequently performed, for example, a moving image, gradually without following these changes sharply. Change the brightness. On the other hand, the luminance information determination means 7 gives an arbitrary temporal change to the luminance change of the plurality of image data A and B. In this way, natural automatic brightness adjustment can be performed even on the eyes of a person who is highly sensitive to changes in brightness, without being aware of the changes.

<Embodiment 3>
FIG. 3 is a block diagram showing the configuration of the image display apparatus according to this embodiment. As shown in FIG. 3, the image display apparatus according to the present embodiment further includes a scene change detection unit 11 which is a detection unit in addition to the configuration of the first embodiment.

  The first image analysis unit 1 outputs a plurality of image data A and B to the scene change detection unit 11. The scene change detection unit 11 detects the time point when the scenes of these images change based on the luminance information data of both the plurality of image data A and B from the first image analysis unit 1. In this way, the scene change detection means 11 which is a detection means according to the present embodiment detects the scene change time point of the image data of both of the plurality of image data A and B.

  The scene change detection unit 11 outputs the detected scene change point to the image processing unit 4 and the luminance information determination unit 7. The image processing means 4 performs a process of changing the luminance of one image data A in accordance with the scene change time detected by the scene change detection means 11. The luminance information determining unit 7 determines the luminances of all the plurality of image data A and B displayed on the screen of the display panel 9 in accordance with the scene change time detected by the scene change detecting unit 11.

  In the image display apparatus according to the present embodiment having the above-described configuration, the image processing unit 4 changes the luminance of one image data A in accordance with the scene change time of the plurality of image data A and B. I do. The luminance information determination unit 7 determines the luminances of the plurality of image data A and B in accordance with the scene change time point output from the scene change detection unit 11. In this way, natural automatic brightness adjustment can be performed even on the eyes of a person who is highly sensitive to changes in brightness, without being aware of the changes. In the present embodiment, the scene change time points of both of the plurality of image data A and B are detected. However, the present invention is not limited to this, and one of the scene change time points is detected. Also good.

1 is a block diagram illustrating a configuration of an image display device according to Embodiment 1. FIG. 6 is a block diagram illustrating a configuration of an image display apparatus according to Embodiment 2. FIG. 6 is a block diagram illustrating a configuration of an image display device according to Embodiment 3. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st image analysis means, 2 Image selection means, 3 Image composition ratio processing means, 4 Image processing means, 5 Image composition means, 6 2nd image analysis means, 7 Luminance information determination means, 8 Display panel drive part, 9 display panel, 10 time change setting means, 11 scene change detection means.

Claims (5)

An image display device that displays an image of a plurality of image data on one screen,
First image analysis means for analyzing a first feature amount for each of the plurality of image data;
Ratio determining means for determining a blending ratio of luminance based on the first feature amount analyzed by the first image analyzing means for one image data selected by the user among the plurality of image data;
Based on the blending ratio determined by the ratio determining means, image processing means for performing a process of changing the luminance of the one image data;
Second image analysis means for analyzing a second feature amount of image data obtained by combining the one image data processed by the image processing means and the plurality of image data other than the one image data;
Brightness determining means for determining brightness of the plurality of image data displayed on the one screen based on the second feature amount analyzed by the second image analyzing means;
Image display device. It further comprises setting means for setting a predetermined time,
The image processing means relaxes a change in luminance of the one image data according to the predetermined time set by the setting means,
The luminance determination unit determines the luminance of the plurality of image data while relaxing the change in luminance of the plurality of image data according to the predetermined time set by the setting unit.
The image display device according to claim 1. A detecting means for detecting a scene change time of the image of the image data;
The image processing means performs a process of changing the luminance of the one image data in accordance with the time of the scene change detected by the detection means,
The brightness determining means determines the brightness of the plurality of image data in accordance with the time of the scene change detected by the detecting means.
The image display device according to claim 1. The blending ratio determined by the ratio determining means can be finely adjusted by the user.
The image display device according to claim 1. The first feature amount analyzed by the first image processing means is at least one of a luminance level, an image area, a luminance distribution, a luminance histogram, a color distribution, and a color histogram for each of the plurality of image data. Including
The second feature amount analyzed by the second image processing unit is a combination of the one image data processed by the image processing unit and the plurality of image data other than the one image data. Including the brightness of the image data,
The image display device according to claim 1.

Images