JP2012173683A - Display control device, information display apparatus, and display control method - Google Patents

Abstract

Provided is a display control device capable of changing a range of display target information displayed on a display screen in accordance with a position of a viewer or a change in position.
A display control device includes a position change detecting unit 111 that detects a change in position of a viewer of display target information displayed on a display screen, and a display change of the display target information according to the detected position change of the viewer. A control unit 112 that controls the range displayed on the display screen is included.
[Selection] Figure 1

Description

  The present invention relates to a display control device, an information display device, and a display control method.

  There are display devices that are equipped with a person detection function using a camera and that control power consumption and limit viewing based on the result of person detection (see, for example, Patent Documents 1 and 2).

  Japanese Patent Application Laid-Open No. 2004-133867 detects the position of a person or the face of a person existing in front of a liquid crystal display panel based on an image captured by a camera, and includes a plurality of contents displayed on the liquid crystal display panel based on the detection result. A liquid crystal display device that prevents unnecessary power consumption by selecting a content of interest from the above and lowering the luminance of the backlight light source other than the light source of the backlight corresponding to the display area of the content of interest It is disclosed.

  Patent Document 2 recognizes a user who is viewing a television receiver by face identification using a camera, etc., and determines whether or not a program can be viewed by the viewing user, thereby restricting viewing. In addition, a television receiver is disclosed that automatically changes the channel by learning the preferences of the user who is watching.

JP 2009-237210 A JP 2000-175117 A

  By the way, when displaying information to be displayed such as a program guide or a television broadcast image on an information display device such as a television receiver, it is displayed on the display screen among the information to be displayed according to the position of the viewer and the position change. If the range to be changed can be changed, it is considered that visibility and convenience can be improved.

  Accordingly, the present invention provides a display control device, an information display device, and a display control method capable of changing a range of display target information displayed on a display screen in accordance with the position of the viewer and a change in position. With the goal.

  The display control apparatus according to the present invention includes a detecting unit that detects a position or a position change of a viewer of display target information displayed on a display screen, and the display according to the detected position or a position change of the viewer. Control means for controlling the range of the target information displayed on the display screen.

  An information display device according to the present invention includes the above-described display control device and display means having the display screen.

  Further, the display control method according to the present invention includes a step of detecting a viewer position or position change of display target information displayed on a display screen, and according to the detected viewer position or position change, And a step of controlling a range of display target information displayed on the display screen.

  According to the present invention, it is possible to change the range of the display target information that is displayed on the display screen in accordance with the position of the viewer and the position change.

1 is a block diagram illustrating an example of a configuration of an information display device in Embodiment 1. FIG. It is a figure for demonstrating a feature extraction part. It is a figure for demonstrating a control part. 3 is a flowchart illustrating an example of an operation of a control unit in the first embodiment. 6 is a block diagram illustrating an example of a configuration of an information display device in Embodiment 2. FIG. 10 is a flowchart illustrating an example of an operation of a control unit in the second embodiment. FIG. 10 is a diagram for explaining an operation of a control unit in the third embodiment. 10 is a flowchart illustrating an example of an operation of a control unit according to Embodiment 3.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram illustrating an example of the configuration of the information display device 100 according to the first embodiment. The information display device 100 is a device that displays display target information on a display screen, and is, for example, a television receiver. Here, the display target information is, for example, a television broadcast image, a program guide, or the like, and is a content to be displayed.

  In FIG. 1, an information display device 100 includes an image receiving unit 101, an image processing unit 102, a graphic generation unit 103, a scaler unit 104, a synthesis unit 105, a display unit 106, a feature extraction unit 107, an image acquisition unit 108, and a human detection unit. 109, a position specifying unit 110, a position change detecting unit 111, and a control unit 112.

  The image receiving unit 101 includes a tuner, a demodulation circuit, a demultiplexer, and the like, receives a broadcast signal such as a television broadcast signal, extracts a bit stream signal, and extracts the bit stream signal as a video bit stream signal or an audio bit stream signal. , And output to metadata including program information. Here, the video bit stream signal is output to the image processing unit 102, and the metadata is output to the control unit 112. A description of the audio bitstream signal is omitted.

  The image processing unit 102 decodes the input video bitstream signal and restores it to a broadcast image (specifically, an image signal or image data representing the broadcast image), and converts the broadcast image into an image suitable for display. Image processing is performed. This image processing includes removal of noise in the image and adjustment of the brightness, color, or size of the image. The image processing unit 102 outputs the obtained broadcast image to the synthesis unit 105.

  The graphic generation unit 103 generates a graphic image (specifically, an image signal or image data representing a graphic image) based on metadata included in the broadcast signal, a user operation on the information display device 100, or the like. Specifically, the graphic generation unit 103 receives the metadata received by the image reception unit 101 from the control unit 112, and uses the EPG (Electric Program Guide: Electronic Program Guide) data included in the metadata to generate a program guide. (Specifically, an image of a program guide) is generated. The graphic generation unit 103 also generates an OSD (on-screen display) image related to the operation of the information display apparatus 100. The graphic generation unit 103 outputs the generated graphic image to the scaler unit 104.

  The scaler unit 104 adjusts the size of the graphic image generated by the graphic generation unit 103. The scaler unit 104 also has a function of cutting out a specific range of the graphic image. The scaler unit 104 outputs the processed graphic image to the synthesis unit 105.

  The combining unit 105 combines the broadcast image from the image processing unit 102 and the graphic image from the graphic generation unit 103 to generate a combined image, and outputs the combined image to the display unit 106. For example, when the display of the program guide is requested based on an instruction from the control unit 112, the synthesizing unit 105 displays the program guide on the entire display screen of the display unit 104 (that is, the entire program guide is displayed). When the program guide is superimposed on the broadcast image with 0% transparency and display of the program guide is not required, the program guide is displayed with 100% transparency so that the program guide is not displayed. Superimpose on the broadcast image. For the OSD image, for example, the composition unit 105 superimposes the OSD image on the broadcast image with a transmittance of 50% so that the OSD image is displayed translucently on the broadcast image. However, the image composition method is not limited to the above, and may be determined as appropriate.

  The display unit 106 has a display screen, and displays the combined image from the combining unit 105 on the display screen. That is, the display unit 106 displays display target information (specifically, an image of the display target information) on the display screen. The display unit 106 is a liquid crystal display device having a liquid crystal panel, for example. However, the display unit 106 may be another display device such as a plasma display device.

  The feature extraction unit 107 receives the composite image from the synthesis unit 105 and extracts a feature amount indicating the visibility of the region from each region of the composite image. Specifically, the feature extraction unit 107 divides the composite image into a plurality of regions, and extracts a high-frequency component of the luminance signal as a feature amount for each region. For example, the feature extraction unit 107 obtains a difference in luminance signal between pixels adjacent in the horizontal direction for each region, and extracts the difference accumulated in the region as a feature amount of the region. Here, the feature extraction unit 107 adds the difference between the luminance signals between the pixels adjacent in the horizontal direction and the difference between the luminance signals between the pixels adjacent in the vertical direction within the region, and the feature amount of the region It is good.

In one example, as shown in FIG. 2, the feature extraction unit 107 divides the composite image 201 into four regions in each of the horizontal direction and the vertical direction and divides the composite image 201 into a total of 16 regions. Extract ingredients. In FIG. 2, hatched areas 202 and 203 are areas where the high-frequency component of the luminance signal is equal to or higher than a predetermined threshold (that is, a region that contains a lot of high-frequency components of the luminance signal and is considered to have poor visibility). ).
The feature extraction unit 107 outputs the extracted feature quantity for each region to the control unit 112.

  The image acquisition unit 108 acquires an image (specifically, an image signal or image data) obtained by capturing the front of the display screen of the display unit 106. When a viewer is present in front of the display screen, the image acquisition unit 108 acquires an image obtained by capturing the viewer. Specifically, the image acquisition unit 108 is configured by an imaging device that images the front of the display screen and generates an image. For example, the image acquisition unit 108 is a small video camera for incorporation into a device, is attached to the housing of the information display device 100, and is arranged so as to capture a viewer in front of the display screen. However, the image acquisition unit 108 may acquire an image captured by an imaging device external to the information display device 100. The image capturing is repeated, for example, 30 times per second. The image acquisition unit 108 outputs the acquired image (hereinafter referred to as “captured image”) to the human detection unit 109.

  The person detection unit 109 detects a person from the captured image acquired by the image acquisition unit 108, and detects the position and size of the person in the captured image as information representing the position of the person in the real space. Specifically, the person detection unit 109 detects the center coordinates of the face of the person in the coordinate system of the captured image as the position of the person in the captured image, and the coordinate system of the captured image as the size of the person in the captured image. The width of the person's face (specifically, the width of the face in the horizontal direction) is detected. However, the human detection unit 109 uses the face length (specifically, the vertical length of the face), the shoulder width, the distance between both eyes, the position of both eyes, and the top of the head as the position and size of the person. Other information such as the coordinates may be detected. In addition, the person detection unit 109 may detect the posture of the person such as an angle with respect to the vertical direction of the face.

When detecting a plurality of persons from the captured image, the person detection unit 109 detects the position and size of the person in the captured image for each of the detected plurality of persons.
The person detection unit 109 outputs a detection result indicating the position and size of each detected person to the position specifying unit 110.

  The position specifying unit 110 specifies the position of the viewer of the display target information based on the detection result from the person detecting unit 109. If the captured image acquired by the image acquisition unit 108 includes a plurality of persons based on the detection result of the person detection unit 109, the position specifying unit 110 determines a main viewer from the plurality of persons. Then, the position and size of the main viewer are specified as the position and size of the viewer. For example, the position specifying unit 110 sets a person having the largest size (for example, the largest face size) among a plurality of people as a main viewer. Further, for example, the position specifying unit 110 evaluates the distance between the detected position of the person and the center point of the captured image, and sets the person closest to the center point as the main viewer. Further, for example, the position specifying unit 110 determines that the operator of the display screen is the main viewer. For example, the position specifying unit 110 detects the position of a remote controller (remote controller) for operating the display screen, and the person closest to the detected position of the remote controller (person determined to be the operator) is the main viewer. To do. When one captured person is included in the captured image, the position specifying unit 110 specifies, for example, the position and size of the person as the position and size of the viewer. The position specifying unit 110 outputs a specifying result indicating the position and size of the specified viewer to the position change detecting unit 111.

  The position change detection unit 111 detects the viewer's position change based on the identification result from the position identification unit 110. Specifically, the position change detection unit 111 detects a change in the position and size of the viewer in the captured image as the position change of the viewer. More specifically, the position change detection unit 111 sequentially compares the current captured image with the previous captured image (for example, 1/30 seconds before), and compares the viewer position difference in the captured image and the viewing in the captured image. The difference of the person's size is detected. In the detection of the position change, from the viewpoint of obtaining a stable result by suppressing the influence of the minute movement of the operator and noise, the position change detection unit 111 calculates the difference using the average value of the position and the size a plurality of times. You may ask for it. The position change detection unit 111 outputs a detection result indicating the detected position change of the viewer to the control unit 112. The position change detecting unit 111 may output the specifying result of the position specifying unit 110 to the control unit 112 together with the detection result.

  Note that the detection of the viewer's position and position change is repeatedly performed, for example, at the same cycle as that of the captured image. However, the detection of the position and the position change may be performed at other timings. For example, the detection is performed at a cycle longer than the imaging cycle, such as once for N (N is an integer of 2 or more) captured images. Also good.

  The control unit 112 controls the range of the display target information displayed on the display screen according to the detected position or position change of the viewer. Specifically, the control unit 112 is displayed on the display screen in the display target information in accordance with the detection result from the position change detection unit 111, that is, the position change of the viewer detected by the position change detection unit 111. Change or adjust the range.

  In the present embodiment, when the viewer moves in a direction approaching the display screen, the control unit 112 enlarges information in a specific range that is narrower than the range displayed on the display screen from the display target information. To display. In this case, for example, the control unit 112 controls the display magnification of the display target information so that the size of the image displayed after the viewer moves is the same as or substantially the same as the size of the image displayed before the movement. To do. For example, when the entire program guide is displayed on the entire display screen, when the control unit 112 detects that the viewer has moved in a direction approaching the display screen, the control unit 112 expands a part of the program guide (that is, displays the program guide). Increase the magnification) and display it on the entire display screen. In the example of FIG. 1, the control unit 112 uses the scaler unit 104 to control the display range and display magnification of the program guide. Note that, for example, when the change in the size of the viewer in the captured image is positive and the size of the change is equal to or greater than a predetermined threshold, the control unit 112 assumes that the viewer has moved in a direction approaching the display screen. judge.

  In one aspect, the control unit 112 determines the specific range based on the moving direction or position of the viewer. Specifically, the control unit 112 enlarges and displays information displayed on a portion of the display screen corresponding to the moving direction of the viewer. For example, as shown in FIG. 3, when the viewer moves to the left front toward the display screen 301 (that is, when the viewer moves from position 302 to position 303), the control unit 112 When the movement is detected, the information displayed on the left portion of the display screen 301 as viewed from the viewer is enlarged and displayed. Or the control part 112 expands and displays the information currently displayed on the part corresponding to a viewer's position among display screens. For example, when the viewer moves from the position 302 to the position 303 as shown in FIG. 3, the control unit 112 displays information displayed in a portion of the display screen 301 that faces the position 303 after the viewer has moved. Is enlarged. Alternatively, the control unit 112 determines the attention part of the viewer on the display screen based on the moving direction and position of the viewer, and enlarges and displays the information displayed on the attention part. For example, when the viewer moves from the position 302 to the position 303 as shown in FIG. 3, the control unit 112 enlarges and displays the information displayed on the portion of the display screen 301 that the viewer is heading.

  Moreover, in one aspect, the control part 112 determines the said specific range based on the visibility of each area | region of the information currently displayed on the display screen. Specifically, the control unit 112 sets an area having the lowest visibility among the areas as the specific range. In the example of FIG. 1, the control unit 112 sets a region having the maximum feature amount as a specific range based on the feature amount of each region extracted by the feature extraction unit 107. Note that the control unit 112 may set, as the specific range, a region wider or narrower than the region centered on the region having the largest feature amount.

  Moreover, in one aspect, the control part 112 determines the said specific range based on at least 1 of a viewer's moving direction and position, and the visibility of each area | region of the information currently displayed on the display screen. For example, the control unit 112 sets, as the specific range, an area with the lowest visibility among the areas of information displayed on the portion of the display screen corresponding to the moving direction or position of the viewer. For example, when the composite image 201 in FIG. 2 is displayed on the entire display screen 301 in FIG. 3, when the viewer moves to the left front as shown in FIG. 3, the control unit 112 moves in the moving direction of the viewer. Of the eight regions on the left side of the composite image 201 displayed on the left part of the corresponding display screen, the region 203 with the lowest visibility is enlarged and displayed on the entire display screen 301.

  Further, in one aspect, when the viewer moves in a direction away from the display screen, the control unit 112 reduces information in a range wider than the range displayed on the display screen among the display target information. To display. In this case, for example, the control unit 112 controls the display magnification of the display target information so that the size of the image displayed after the viewer moves is the same as or substantially the same as the size of the image displayed before the movement. To do. For example, when a part of the program guide is displayed on the entire display screen and the control unit 112 detects that the viewer has moved away from the display screen, the control unit 112 reduces the entire program guide (that is, displays the program guide). Reduce the magnification) and display it on the entire display screen. For example, when the change in the size of the viewer in the captured image is negative and the size of the change is equal to or greater than a predetermined threshold, the control unit 112 determines that the viewer has moved away from the display screen. .

  In the example of FIG. 1, the detection unit is realized by the image acquisition unit 108, the person detection unit 109, the position specifying unit 110, and the position change detection unit 111, and the control unit is realized by the control unit 112. The display control apparatus is realized by the image acquisition unit 108, the person detection unit 109, the position specifying unit 110, the position change detection unit 111, and the control unit 112.

  FIG. 4 is a flowchart showing an example of the operation of the control unit 112 in the first embodiment. Hereinafter, the operation of the control unit 112 will be described with reference to FIG. The process illustrated in FIG. 4 is repeatedly performed at the same cycle as the imaging cycle of the image acquisition unit 108, for example. However, it may be performed in a cycle longer than the cycle of imaging, such as once per N (N is an integer of 2 or more) captured images. In the following description, it is assumed that the program table generated by the graphic generation unit 103 is displayed on the display screen of the display unit 106.

  The control unit 112 acquires the detection result of the viewer position change from the position change detection unit 111, that is, the difference in the viewer position and the size difference in the captured image (S11).

  Next, the control unit 112 determines whether or not the viewer has moved in a direction approaching the display screen based on the detection result of the viewer's position change acquired in step S11 (S12). For example, the control unit 112 determines that the viewer has moved in a direction approaching the display screen when the difference in viewer size is positive and the difference is equal to or greater than a predetermined threshold.

  Until it is determined that the viewer has moved in a direction approaching the display screen, the control unit 112 continues to acquire the detection result of the position change detection unit 111 (S12: NO).

  When it is determined that the viewer has moved in the direction approaching the display screen (S12: YES), the control unit 112 advances the process to step S13. For example, when the visibility of the program guide displayed on the display screen is poor, as shown in FIG. 3, the viewer brings his face close to the display screen 301 so that the program guide can be seen well, and from the position 302. The face is moved to position 303. Thereby, the size of the viewer in the captured image increases, and based on this change, the control unit 112 determines that the viewer has moved in a direction approaching the display screen, and proceeds to step S13.

  In step S <b> 13, the control unit 112 acquires the feature amount for each region extracted by the feature extraction unit 107. Here, it is assumed that the feature amount extraction result by the feature extraction unit 107 is as shown in FIG. In FIG. 2, among the 16 areas of the composite image 201, areas 202 and 203 contain a lot of high-frequency components of the luminance signal, so that many programs with a short broadcast time are displayed or many characters are displayed. It is considered that the visibility of the program guide has deteriorated.

  Next, the control unit 112 selects a plurality of regions corresponding to the moving direction of the viewer from the 16 regions divided by the feature extraction unit 107 (S14). Here, the control unit 112 selects eight regions in the left direction corresponding to the moving direction (left direction) of the viewer. The number of regions to be selected is not limited to the above and may be set as appropriate.

  Next, the control unit 112 determines a region having the largest feature amount from the plurality of regions selected in step S14 based on the feature amount for each region acquired in step S13 (S15). For example, the control unit 112 determines the region having the largest feature amount by sequentially comparing the feature amounts of the eight selected regions. Here, the region 203 in FIG. 2 is determined as the region having the largest feature amount.

  Then, the control unit 112 uses the scaler unit 104 to center the portion corresponding to the region (here, the region 203) determined in step S15 in the program table displayed on the display screen of the display unit 106. The range is enlarged and displayed on the display screen (S16). That is, the control unit 112 enlarges and displays the program table with a portion corresponding to the region 203 of the program table displayed on the display screen as a center.

According to the first embodiment described above, the following effects (1) to (7) can be obtained.
(1) The display control device detects the position or position change of the viewer of the display target information displayed on the display screen, and displays the display screen of the display target information according to the detected position or position change of the viewer. Control the range displayed on the. For this reason, the range displayed on a display screen among display object information can be changed according to a viewer's position and position change. This makes it possible to improve visibility and convenience. In addition, the range of the display target information displayed on the display screen can be changed without requiring a special operation by the viewer.

  (2) When the viewer moves in a direction approaching the display screen, the display control device enlarges and displays on the display screen information in a specific range that is narrower than the range displayed on the display screen among the display target information. . Thereby, the visibility of display object information can be improved according to the operation | movement which a viewer approaches a display screen. For example, when the visibility of the program guide displayed on the display screen is poor, when the viewer brings his face close to the display screen, the program guide is enlarged and the visibility of the program guide is improved.

  Note that the information display device may be configured such that the font size of the program guide can be changed by operating a remote controller. In this configuration, when the visibility of the program guide is poor, the viewer can enlarge the characters of the program guide using the remote controller. However, since buttons of a remote controller that are generally used for changing the font size are infrequently used and small, it may take time to find their positions.

  (3) The display control device determines the specific range (that is, the range to be enlarged and displayed) based on the moving direction or position of the viewer. Thereby, it is possible to enlarge and display an appropriate range according to the moving direction and position of the viewer. Specifically, it is possible to enlarge and display a range that is likely to be watched by the viewer among the information displayed on the display screen.

  (4) The display control device determines the specific range (that is, the enlarged display range) based on the visibility of each area of the information displayed on the display screen. As a result, an appropriate range corresponding to the visibility of each area of information displayed on the display screen can be enlarged and displayed. Specifically, it is possible to enlarge and display a range that is likely to be watched by the viewer among the information displayed on the display screen.

  (5) When the viewer moves in a direction away from the display screen, the display control apparatus reduces and displays on the display screen information in a range wider than the range displayed on the display screen among the display target information. Thereby, the display range of display target information can be expanded according to the operation | movement from which a viewer moves away from a display screen. For example, when the viewer brings his / her face close to the display screen and the program guide is enlarged and displayed, when the viewer returns his face to the original position, the display range of the program guide can be restored.

  (6) The display control apparatus acquires a captured image obtained by capturing the front of the display screen, and detects the position or position change of the viewer from the captured image. Thereby, a viewer's position and position change are detectable with a simple structure.

  (7) When the acquired captured image includes a plurality of persons, the display control apparatus determines a main viewer from the plurality of persons, and determines the position or position change of the main viewer. Detect as position or position change. Thereby, even if it is a case where a picked-up image contains a some person, control can be performed appropriately.

  In the above description, an example in which a program guide is received from a broadcast signal has been shown, but the information display device may download the program guide from an information server on the Internet, for example.

  In the above description, the program guide is mainly exemplified as the graphic image, but the graphic image may be an image of other information such as weather forecast and news.

  In the above description, the case where the size of the viewer in the captured image is detected as the distance information indicating the distance from the display screen to the viewer is exemplified, but the distance information may be acquired by other methods. For example, the distance information may be obtained by acquiring a stereo image by a plurality of imaging devices, or the distance information may be obtained by using a special imaging device having a function of measuring the distance.

  In the above description, the video camera attached to the case of the information display device is illustrated as the image acquisition unit 108. However, the image acquisition unit 108 does not need to be attached to the case, and the viewer is appropriately selected. As long as it is possible to shoot a video camera, it may be a video camera used for surveillance purposes or a video phone.

  Further, in the above description, the case where the viewer's position and position change are detected from the captured image is exemplified. However, the viewer's position and position change may be detected by, for example, a method using an infrared sensor or a method using an ultrasonic radar. For example, it may be detected by other methods.

  In the above description, the case where the display range of the program guide is mainly controlled has been exemplified, but the control unit 112 may control the display range of an image such as a broadcast image.

  Further, in the above description, the case where the range displayed on the display screen in the display target information is mainly changed in accordance with the change in the position of the viewer is exemplified, but the control unit 112 is in accordance with the position of the viewer. You may determine the range displayed on a display screen among display object information. Specifically, the control unit 112 may determine the display range from the position of the viewer based on a predetermined rule. For example, when the distance from the display screen to the viewer is equal to or greater than a predetermined threshold, the control unit 112 displays the entire display target information on the entire display screen, and the distance from the display screen to the viewer is less than the predetermined threshold. In this case, a part of the display target information (for example, a part corresponding to the position of the viewer) may be displayed on the entire display screen.

Embodiment 2. FIG.
FIG. 5 is a block diagram illustrating an example of the configuration of the information display device 500 according to the second embodiment. Since this information display device 500 is almost the same as that of the first embodiment, the same parts as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the present embodiment, the information display device 500 further includes a frame memory 121 in addition to the configuration of the information display device 100 of the first embodiment. In addition to the functions described in the first embodiment, the image processing unit 102, the synthesis unit 103, and the control unit 112 further have the following functions.

  The image processing unit 102 is configured to read / write an image from / to the frame memory 121. Specifically, in response to a request from the control unit 112, the image processing unit 102 stores one frame of the broadcast image constituting the moving image in the frame memory 121 in response to a request from the control unit 112. In response to the request, one frame of broadcast image is read from the frame memory 121 and output to the synthesis unit 103. Accordingly, the image processing unit 102 can output a still image instead of a moving image for a certain period, and can realize an image pause operation.

  The composition unit 103 further has a function of changing the size of the image read from the frame memory 121 and a function of cutting out a specific range of the image.

  When changing the range displayed on the display screen in the display target information, the control unit 112 causes the display screen to display a still image corresponding to the changed range of the display target information. For example, the control unit 112 temporarily stops the image displayed on the display screen when adjusting the display range according to the change in the position of the viewer. The still image is, for example, a still image of display target information at a time when a position change of the viewer occurs or at a time close thereto. Specifically, when displaying a moving image on the display screen, the control unit 112 changes the range of the moving image displayed on the display screen according to a change in the position of the viewer. Of the image of one frame of the moving image at the time when the position change occurs, the image in the changed range is displayed on the display screen. Specifically, the control unit 112 displays an image (still image) of one frame on the display screen for a predetermined period. The predetermined period may be determined as appropriate. For example, the predetermined period is a period from when the viewer's position changes until the predetermined time elapses.

  In the example of FIG. 5, when the control unit 112 detects a change in the position of the viewer, the control unit 112 controls the image processing unit 102 to store a one-frame broadcast image in the frame memory 121 and to read out the stored broadcast image. The image is output to the combining unit 103, and the combining unit 103 is controlled to display the changed range of the broadcast image on the display screen.

  FIG. 6 is a flowchart illustrating an example of the operation of the control unit 112 according to the second embodiment. Hereinafter, the operation of the control unit 112 will be described with reference to FIG. In the following description, it is assumed that a broadcast image is displayed on the display screen of the display unit 106.

  The control unit 112 acquires the detection result of the viewer position change from the position change detection unit 111, that is, the difference in the viewer position and the size difference in the captured image (S21).

  Next, the control unit 112 determines whether or not the viewer has moved in a direction approaching the display screen based on the detection result of the viewer's position change (S22).

  Until it is determined that the viewer has moved in the direction approaching the display screen, the control unit 112 continues to acquire the detection result of the position change detection unit 111 (S22: NO).

  When it is determined that the viewer has moved in a direction approaching the display screen (S22: YES), the control unit 112 advances the process to step S23. For example, when the visibility of the broadcast image displayed on the display screen is poor, as shown in FIG. 3, the viewer brings his face closer to the display screen 301 so that the broadcast image can be seen well, and from the position 302. The face is moved to position 303. Thereby, the size of the viewer in the captured image increases, and based on this change, the control unit 112 determines that the viewer has moved in a direction approaching the display screen, and advances the processing to step S23.

  In step S <b> 23, the control unit 112 stores one frame of broadcast image in the frame memory 121. And the control part 112 reads the broadcast image of 1 frame memorize | stored in the frame memory 121, and displays it on a display screen (S24). The display of the broadcast image of one frame is performed for a predetermined period, whereby the broadcast image is displayed in a paused state on the display screen.

  Next, the control unit 112 acquires the feature amount for each region extracted by the feature extraction unit 107 (S25). For example, the control unit 112 acquires the feature amount extracted from each region of the composite image generated based on the broadcast image of one frame read from the frame memory 121. Here, it is assumed that the feature amount extraction result by the feature extraction unit 107 is as shown in FIG. In FIG. 2, among the 16 areas of the composite image 201, areas 202 and 203 contain a lot of high-frequency components of the luminance signal, and therefore, for example, many characters are displayed in the broadcast image. It is thought that the visibility is getting worse.

  Next, the control unit 112 selects a plurality of regions corresponding to the moving direction of the viewer from the 16 regions divided by the feature extraction unit 107 (S26). Here, the control unit 112 selects eight regions in the left direction corresponding to the moving direction (left direction) of the viewer (S26).

  Next, the control unit 112 determines a region having the largest feature amount from the plurality of regions selected in step S26 based on the feature amount for each region acquired in step S25 (S27). Here, the region 203 in FIG. 2 is determined as the region having the largest feature amount.

  Then, the control unit 112 focuses on the portion corresponding to the region determined in step S27 (here, the region 203) in one frame of the broadcast image (that is, the output image of the frame memory 121) displayed on the display screen. The range to be enlarged is displayed on the display screen (S28). That is, the control unit 112 enlarges the output image of the frame memory 121 around the area 203 and displays it on the display screen.

According to the second embodiment described above, the following effect (8) can be obtained.
(8) When changing the range displayed on the display screen of the display target information, the display control device displays a still image corresponding to the range after the change of the display target information on the display screen. Thereby, when the display target information displayed on the display screen is a moving image, the changed range of the display target information can be presented to the viewer as a still image. For example, in the case where the visibility of a moving image displayed on the display screen is poor, when the viewer brings his / her face close to the display screen, one frame image of the moving image can be enlarged and displayed. Can appropriately present the image that the user wants to see.

Embodiment 3 FIG.
Hereinafter, the information display apparatus in Embodiment 3 will be described. This information display device differs from that of the first embodiment in the operation of the control unit 112, and the other parts are almost the same. In the following description, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description is omitted or simplified.

  In the present embodiment, the control unit 112 moves the range displayed on the display screen among the display target information according to the change in the position of the viewer, and scrolls the display target information on the display screen. Specifically, when the viewer moves in a direction parallel to the display screen, the control unit 112 moves the range displayed on the display screen in the display target information in a direction corresponding to the moving direction of the viewer. Let For example, when the viewer moves in the horizontal direction (that is, in the left-right direction), the control unit 112 scrolls the display target information in the horizontal direction. The control unit 112 may scroll the display target information in the vertical direction when the viewer moves in the vertical direction (that is, the vertical direction).

  In one aspect, when the viewer moves in a direction approaching the display screen, the control unit 112 reduces and displays on the display screen information that is wider than the range displayed on the display screen among the display target information. When the viewer moves away from the display screen, information in a range narrower than the range displayed on the display screen in the display target information is enlarged and displayed on the display screen.

  FIG. 7 is a diagram for explaining the operation of the control unit 112 in the third embodiment. FIG. 7 shows a program table 701 that is display target information, a display screen 702 of the display unit 106, and viewer positions 703 and 704 of the display screen 702. The program table 701 includes a channel CH. 1 to CH. It contains program information for up to 6 channels.

  FIG. 8 is a flowchart illustrating an example of the operation of the control unit 112 in the third embodiment. Hereinafter, the operation of the control unit 112 will be described with reference to FIGS. 7 and 8. In FIG. 7, the viewer is initially present at the position 703, and the display screen 702 of the display unit 106 displays the channel CH. 2 to channel CH. It is assumed that up to 5 program information is displayed.

  The control unit 112 acquires the detection result of the viewer position change from the position change detection unit 111, that is, the difference in the viewer position and the size difference in the captured image (S31).

  Next, the control unit 112 determines whether or not the viewer has moved based on the detection result of the viewer's position change (S32). For example, the control unit 112 determines that the viewer has moved in a direction parallel to the display screen when the difference in the position of the viewer in the captured image is greater than or equal to a predetermined threshold.

  Until it is determined that the viewer has moved, the control unit 112 continues to acquire the detection result of the position change detection unit 111 (S32: NO).

  When it is determined that the viewer has moved (S32: YES), the control unit 112 advances the process to step S33. For example, when the viewer moves to the left from the position 703 to the position 704, the position of the viewer in the captured image moves. Based on this change, the control unit 112 moves the viewer to the left toward the display screen. The process proceeds to step S33.

  In step S33, the control unit 112 moves the range displayed on the display screen 702 in the program guide 701 according to the moving direction of the viewer, and displays the moved range on the display screen 702. Specifically, the control unit 112 outputs the program guide image data output to the combining unit 105 so that the range displayed on the display screen 702 of the program guide 701 moves according to the moving direction of the viewer. Update. Here, the control unit 112 controls the channel CH. In accordance with the movement of the viewer in the left direction. 3 to channel CH. The image data of the program guide is updated so that the program information 6 is displayed on the display screen 702. For example, the control unit 112 uses the scaler unit 104 to control the channel CH. 1 to channel CH. From the images of the entire program guide up to 6, the channel CH. 3 to channel CH. Images up to 6 are cut out and output to the combining unit 105. Alternatively, the control unit 112 uses the channel CH. 1 to CH. Of the program information up to 6, the channel CH. 3 to channel CH. 6 program information is selectively supplied to the graphic generation unit 106, and the channel CH. 3 to channel CH. The image data of up to 6 program guides is generated. Then, based on the image data of the updated program guide, the channel CH. 3 to channel CH. Up to six pieces of program information are displayed on the display screen 702. When the viewer moves to the right, the control unit 112 controls the channel CH. 1 to channel CH. Program information up to 4 is displayed on the display screen 702. In addition, when the viewer moves in the forward direction (direction approaching the display screen) (for example, when the size of the viewer's face in the captured image becomes large), the control unit 112 controls the channel CH. 1 to channel CH. Up to six pieces of program information may be displayed on the display screen 702. In addition, when the viewer moves backward, the control unit 112 controls the channel CH. 3 to channel CH. Up to four pieces of program information may be displayed on the display screen 702.

  The operation of the third embodiment is easy to understand when the display screen 702 is assumed to be a window and the displayed program guide 701 is a landscape that can be seen from the window. When the viewer moves to the left, the right landscape outside the window can be seen, and when the viewer moves to the right, the left landscape outside the window can be seen. Also, a wider range of scenery can be seen when the viewer approaches the window, and a narrower range of scenery can be seen when the viewer moves away from the window.

According to the third embodiment described above, the following effects (9) and (10) can be obtained.
(9) The display control apparatus moves a range displayed on the display screen in the display target information according to a change in the position of the viewer, and scrolls the display target information on the display screen. Thereby, display target information can be scroll-displayed according to a viewer's movement, and a viewer's convenience can be improved. Further, for example, it can be simulated that the range of the landscape that can be seen from the window changes according to the movement of the person who looks out the window.

  (10) When the viewer moves in a direction approaching the display screen, the display control device reduces information in a range wider than the range displayed on the display screen among the display target information and displays the information on the display screen. When the viewer moves in a direction away from the display screen, information in a range narrower than the range displayed on the display screen among the display target information is enlarged and displayed on the display screen. Thereby, for example, it is possible to simulate that a wider range of scenery can be seen when a person looking outside the window approaches the window, and that a narrower scenery can be seen when moving away from the window.

  In the above description, the case where the program guide is mainly scroll-displayed is exemplified, but other information may be scroll-displayed. For example, when the information display device has a function of displaying an image of a photo stored in a predetermined storage area on the display screen, the viewer can use the information display device to display a plurality of photos arranged in order in the storage area. Depending on the movement in the left-right direction, the next photo of the photo being displayed may be displayed or the previous photo may be displayed.

  In the first to third embodiments described above, the function of the display control device may be realized only by hardware resources such as an electronic circuit, or may be realized by cooperation of hardware resources and software. When realized by the cooperation of hardware resources and software, the function of the display control device is realized, for example, by a display control program being executed by a computer. More specifically, the function of the display control device is that a display control program recorded in a recording medium such as a ROM (Read Only Memory) is read out to the main storage device, and is executed by a central processing unit (CPU). It is realized by being executed. The display control program may be provided by being recorded on a computer-readable recording medium such as an optical disk, or may be provided via a communication line such as the Internet.

  In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of this invention, it can implement with a various aspect.

  100,500 information display device, 101 image receiving unit, 102 image processing unit, 103 graphic generation unit, 104 scaler unit, 105 synthesis unit, 106 display unit, 107 feature extraction unit, 108 image acquisition unit, 109 human detection unit, 110 A position specifying unit, 111 a position change detecting unit, and 112 a control unit.

Claims (11)

Detection means for detecting the position of the viewer of the display target information displayed on the display screen or a change in position;
Control means for controlling a range of the display target information displayed on the display screen according to the detected position or position change of the viewer;
A display control apparatus comprising:   When the viewer moves in a direction approaching the display screen, the control means expands information in a specific range that is narrower than the range displayed on the display screen in the display target information to the display screen. The display control apparatus according to claim 1, wherein display is performed.   The display control apparatus according to claim 2, wherein the control unit determines the specific range based on a moving direction or position of the viewer.   The display control apparatus according to claim 2, wherein the control unit determines the specific range based on visibility of each area of information displayed on the display screen.   When the viewer moves in a direction away from the display screen, the control means reduces the information in a range wider than the range displayed on the display screen from the display target information and displays the information on the display screen. The display control apparatus according to claim 1, wherein the display control apparatus is a display control apparatus.   The said control means displays the still image corresponding to the range after the change of the said display object information on the said display screen, when changing the said display range. The display control apparatus described.   The control means is configured to move a range of the display target information displayed on the display screen according to a change in the position of the viewer, and scroll the display target information on the display screen. The display control device according to claim 1.   The display according to any one of claims 1 to 7, wherein the detection unit acquires an image in which the front of the display screen is captured, and detects the position or position change of the viewer from the image. Control device.   When the acquired image includes a plurality of persons, the detection unit determines a main viewer from the plurality of persons, and determines the position or position change of the main viewer. The display control apparatus according to claim 8, wherein the display control apparatus detects the change. A display control device according to any one of claims 1 to 9,
Display means having the display screen;
An information display device comprising: Detecting the viewer's position or position change of the display target information displayed on the display screen;
Controlling a range of the display target information displayed on the display screen according to the detected position or position change of the viewer;
A display control method comprising:

Images