JP2014048499A - Display control device, and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique in which when a plurality of images whose color spaces are mutually different are displayed simultaneously, each color of the plurality of images simultaneously displayed can be faithfully reproduced.SOLUTION: A display control device according to the present invention is a display control device which controls a display device for displaying an image with a display parameter corresponding to a set color space, includes: detection means by which, when a plurality of images are displayed on the display device simultaneously, for each image to be displayed, an area in which the image is displayed is detected out of a screen of the display device; and setting means by which for each area detected by the detection means, to the area, a color space of the image displayed in the area is set.

Description

  The present invention relates to a display control device and a control method thereof.

  In recent years, use cases in which a high-quality display is used for viewing images have been studied. The display can faithfully reproduce the color of the image by displaying the image using display parameters corresponding to the color space of the image. The color space is, for example, AdobeRGB or sRGB (standard RGB). sRGB is a standard established by the International Electrotechnical Commission and is the most popular color space. AdobeRGB has a wider color gamut than sRGB, and is a color space that is expected to be popular in place of sRGB. In addition, various color spaces are defined according to applications.

  In addition, the image display method includes a method of switching a plurality of images in order (for example, a slide show display) and a method of simultaneously displaying a plurality of images. When images are displayed by these methods, the color space may be different between images. Therefore, in order to faithfully reproduce the color of the image, it is necessary to perform processing for switching display parameters of the display in accordance with the image to be displayed.

  In the technique described in Patent Literature 1, when a plurality of images are simultaneously displayed on a display, common display parameters are set for the entire display. For this reason, the technique described in Patent Document 1 may not be able to faithfully reproduce the colors of some of the images displayed simultaneously. Specifically, when there is an image in a color space that does not correspond to the set display parameter among a plurality of images displayed at the same time, the color of the image cannot be faithfully reproduced.

  In the technique disclosed in Patent Document 2, when a plurality of images are displayed as a slide show, the plurality of images are classified into a plurality of classes, and a plurality of images belonging to the class are simultaneously displayed for each class. In the technique described in Patent Document 2, if images in the same color space are classified into the same class, the display parameters corresponding to the class are used for each class, so that each color of a plurality of images displayed simultaneously can be faithfully reproduced. Can be reproduced. However, with the technique described in Patent Document 2, if images in the same color space are classified into the same class, a plurality of images having different color spaces cannot be displayed simultaneously. As a result, the order in which the images are displayed is restricted.

JP 2008-271572 A JP 2010-39807 A

  An object of the present invention is to provide a technique capable of faithfully reproducing each color of a plurality of images displayed simultaneously when a plurality of images having different color spaces are displayed at the same time.

The display control device of the present invention
A display control device that controls a display device that displays an image with display parameters corresponding to a set color space,
When displaying a plurality of images at the same time on the display device, for each image to be displayed, detection means for detecting a region where the image is displayed from the screen of the display device;
For each area detected by the detection means, setting means for setting the color space of the image displayed in the area for the area;
It is characterized by having.

The display control device control method of the present invention includes:
A control method of a display control device for controlling a display device that displays an image with display parameters corresponding to a set color space,
When displaying a plurality of images on the display device at the same time, for each image to be displayed, a detection step of detecting a region where the image is displayed from the screen of the display device;
For each area detected in the detection step, a setting step for setting a color space of an image displayed in the area for the area;
It is characterized by having.

  According to the present invention, when a plurality of images having different color spaces are displayed at the same time, the colors of the plurality of images displayed at the same time can be faithfully reproduced.

FIG. 3 is a block diagram illustrating an example of a configuration of a display device according to the first and second embodiments. 1 is a block diagram illustrating an example of a functional configuration of a CPU according to a first embodiment. FIG. 10 is a diagram illustrating an example of display area information according to the first embodiment. FIG. 10 is a diagram illustrating an example of display area information according to the first embodiment. 7 is a flowchart illustrating an example of a processing flow of the display device according to the first embodiment. The figure which shows an example of the parameter management table which concerns on Example 1. FIG. 7 is a flowchart illustrating an example of a processing flow of the display device according to the first embodiment. Flow chart showing an example of the first method Flow chart showing an example of the second method Flow chart showing an example of the third method The figure which shows an example of the selection result of a display area FIG. 6 is a block diagram illustrating an example of a functional configuration of a CPU according to the second embodiment. 10 is a flowchart illustrating an example of a processing flow of the display device according to the second embodiment. Schematic diagram showing an example of slide-in display The figure which shows the outline | summary of the speed information and display area information which concern on Example 2. FIG. 6 is a diagram illustrating timing for setting a color space for a display area according to the second embodiment.

<Example 1>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 1 of the present invention will be described.
In this embodiment, when a plurality of images are displayed simultaneously on a display device that displays images with display parameters corresponding to the set color space, the images are displayed from the screen of the display device for each image to be displayed. Area is detected. For each detected area, the color space of the image displayed in the area is set for that area. Accordingly, when a plurality of images having different color spaces are displayed at the same time, the colors of the plurality of images displayed at the same time can be faithfully reproduced.

The overall configuration of the display device according to this embodiment will be described.
FIG. 1 is a block diagram illustrating an example of the configuration of the display device according to the present embodiment.
The CPU 1 is a CPU (Central Processing Unit) that performs various controls in the display device. Details of processing performed by the CPU 1 will be described later.

  The display control unit 2 transmits an image to the display unit 3 described later. Specifically, the display control unit 2 reads an image that has been converted by a decoder 6 described later and developed in a memory 5 described later, and transmits the image to the display unit 3.

  The display unit 3 displays the input image on the screen. Specifically, the display unit 3 displays an image with the set display parameters. In this embodiment, the display unit 3 is a liquid crystal display. The display unit 3 is not limited to a liquid crystal display. As the display unit 3, for example, a display device such as a liquid crystal display, a plasma display, or an organic EL display can be used.

  The storage unit 4 stores images, order information, resolution information, display format information, and the like in advance. The order information is information representing the display order of images in the slide show display. The resolution information is information indicating the resolution of the display unit 3 (for example, the total number of pixels on the screen). The display format information is information representing a display format such as a full screen display of one image and a list display of a plurality of images. The display format information includes, for example, information such as an image display position, an image display size, and the number of images. The storage unit 4 also stores various programs executed in the display device in advance.

  The memory 5 temporarily stores the image converted by the decoder 6, various calculation results, and the like.

  The decoder 6 converts the image to be displayed (display target image) into a state suitable for display, and develops the converted image in the memory 5. In general, images are compressed in a format such as JPEG (Joint Photographic Expert Group) in order to reduce the amount of data. The decoder 6 performs a decoding process on the compressed image. Thereby, the compressed image is converted into a state suitable for display. In recent years, there is a case where an image called a RAW image that is not subjected to color processing is handled as shooting data. The decoder 6 performs development processing on the RAW image. Thereby, the RAW image is converted into a state suitable for display.

  The external interface unit 7 is an interface unit that transmits data between the display device and the peripheral device. Specific examples include network interfaces such as USB (Universal Serial Bus) and Ether. In the present embodiment, the external interface unit 7 is used when a display target image or the like is input into the display device from an external memory 10 or a network 11 described later.

  The display setting unit 8 performs display settings when displaying an image on the display unit 3. In this embodiment, a plurality of display parameters corresponding to a plurality of color spaces are prepared in advance. The display setting unit 8 sets display parameters corresponding to the set color space in the display unit 3. In a general display device, brightness, color temperature, and the like can be set. The display parameter is a parameter including brightness and color temperature, for example. The color temperature is a color temperature of a reference color (for example, white).

  The internal bus 9 connects each functional unit in the display device and transmits various data between the functional units.

The external memory 10 is connected to the image display device via the external interface unit 7.
The network 11 is connected to the image display device via the external interface unit 7.

The configuration of the CPU 1 will be described.
FIG. 2 is a block diagram illustrating an example of a functional configuration of the CPU 1 (display control apparatus according to the present embodiment). Each function part which CPU1 has is implement | achieved, for example, when CPU1 reads a program from the accumulation | storage part 4, and executes it.

The color space acquisition unit 101 acquires a display target image (image data) from the display image control unit 104 described later, and acquires color space information representing the color space of the display target image from the acquired display target image. When a plurality of images are displayed, color space information is acquired for each display target image. The color space information is acquired by analyzing the display image. For example, the color space information of an image is recorded in a header portion of image data or the like, and is acquired by performing a parsing process on the header portion. Specifically, the header part is Exif (Exchangeable image file format) information generally given to the image data, and the color space acquisition unit 101 reads the color space information described in the Exif information. .
The color space acquisition unit 101 outputs the acquired color space information to the color space setting unit 103.

The display area detection unit 102 detects an area (display area) where a display target image is displayed from the screen of the display device. When a plurality of images are displayed, a display area is detected for each display target image. In the present embodiment, the display area detection unit 102 acquires display format information from a display image control unit 104 described later, and acquires resolution information from the storage unit 4. Then, the display area detection unit 102 generates display area information representing the display area using the acquired display format information and resolution information. The display area information is, for example, the coordinates of each vertex of the display area.
The display area detection unit 102 outputs the generated display area information to the color space setting unit 103.

FIG. 3 is a diagram illustrating an example of display area information.
FIG. 3 shows an example in which images 202 to 205 are displayed on a display device in a display format for displaying four images.
The display area detection unit 102 generates display area information for each of the images 202 to 205 using the display format information and the resolution information. In this embodiment, coordinate information that uniquely indicates a display area is generated as display area information. In the figure, X represents horizontal coordinates, and Y represents vertical coordinates. In the example of FIG. 3, the coordinates of the upper left corner of the screen are the origin. The coordinates (X, Y) of the upper left corner of the image 202 are (x1, y1). The coordinates (X, Y) at the upper right corner of the image 202 are (x2, y2). The coordinates (X, Y) of the lower right corner of the image 202 are (x3, y3). The coordinates (X, Y) of the lower left corner of the image 202 are (x4, y4). The display area detection unit 102 determines the four coordinates from the display format information and resolution information. Then, the display area detection unit 102 generates information 206 in which the four coordinates (the coordinates of the four corners of the image 202) are assigned in order as display area information of the image 202. The region of the image 202 can be specified by connecting the four coordinates in a straight line in order.

FIG. 4 is a diagram illustrating an example of display area information.
FIG. 4 shows an example in which an image is displayed in a display format different from that in FIG. Specifically, FIG. 4 shows an example in which the images 302 and 303 are displayed on the display device in a display format for displaying two images. In the example of FIG. 4, the image 302 and the image 303 overlap each other.
The display area detection unit 102 detects the display area in consideration of overlapping images. Specifically, the display area information is generated so as not to include an area (an area that is not displayed) where other images overlap. In the example of FIG. 4, information 304 in which six coordinates (x5, y5) to (x10, y10) are given an order is generated as display area information of the image 302. The display area information of the image 303 is information in which the coordinates of the four corners of the image 303 are given an order, as in FIG.

In FIGS. 3 and 4, since the shape of the display area is rectangular, the display area can be determined by connecting the coordinates with a straight line. However, the shape of the display area is not necessarily rectangular. For example, there may be a curve between coordinates. In that case, information obtained by adding the order and curve information (information representing a curve) to the coordinates may be generated as display area information. Thereby, the display area can be determined from the display area information.
The display area information may be the start point coordinates and end point coordinates of the display area, the position and size of the display area, and the like.

When the color space information is input from the color space acquisition unit 101 and the display area information is input from the display area detection unit 102, the color space setting unit 103 sets the color space for each display area using the information. To do. Specifically, the color space setting unit 103 sets, for each area detected by the display area detection unit 102, the color space of the image displayed in the area. In the present embodiment, the color space setting unit 103 generates information (color space setting table) representing the color space of the image displayed in each display area and notifies the display setting unit 8 of the information. Then, the color space setting unit 103 instructs the display setting unit 8 to set display parameters (setting instruction). Thereby, the display setting unit 8 determines the color space for each display area (the set color space) from the color space setting table, and the display parameters corresponding to the set color space are set for each display area. Is done.
The color space setting unit 103 also selects a display area for setting the color space. Even in a display device in which a color space can be individually set for each area, there may be an upper limit on the number of areas in which the color space can be set. If there is an upper limit on the number of areas where the color space can be set, a display area where the color space cannot be set may occur. Therefore, in the present embodiment, when the number of display areas detected by the display area detection unit 102 is larger than the upper limit, the upper limit number of display areas is selected from among the plurality of detected display areas as a color space. Select as the display area to set. A method for selecting the display area will be described in detail later.

The display image control unit 104 acquires a display target image and display format information from the storage unit 4 in response to a user operation. For example, when a user operation for performing a slide show display is performed, the display image control unit 104 acquires corresponding order information from the storage unit 4, and acquires a display target image and display format information according to the order information. Then, the display image control unit 104 instructs the decoder 6 to decode the display target image (decode instruction), and instructs the display control unit 2 to display the display target image (display instruction). Thereby, the display target image is decoded in the decoder 6. Then, the display control unit 2 generates a display image (an image in which the display target image is arranged according to the display format information) from the decoded display target image and the display format information, and outputs the generated display image to the display unit 3. By outputting the display image to the display unit 3, the display image is displayed on the screen.
Further, when the display image control unit 104 acquires the display target image and the display format information, the display image control unit 104 instructs the color space acquisition unit 101 to acquire the color space information and instructs the display region detection unit 102 to detect the display region. Thereby, the color space acquisition unit 101 acquires the color space information, and the display region detection unit 102 detects the display region.
The display target image may be acquired from the external memory 10 or the network 11 via the external interface unit 7.
Note that the order information and the display format information are not stored in advance, but may be generated according to a user operation.

A processing flow of the display device according to the present embodiment will be described with reference to the flowchart of FIG.
FIG. 5 is a flowchart illustrating an example of a process flow (a process flow until an image is displayed on the screen) of the display device according to the present embodiment. It is assumed that one display parameter is set for the entire screen before the start of the processing flow of FIG. That is, it is assumed that one color space is set for the entire screen.

First, in S401, the display image control unit 104 acquires display format information.
Next, in S402, the display image control unit 104 acquires a display target image.

  In step S <b> 403, the display image control unit 104 instructs the color space acquisition unit 101 to acquire color space information. The color space acquisition unit 101 acquires color space information of a display target image (the display target image acquired in S402) in response to an instruction from the display image control unit 104, and the acquired color space information is used as the color space setting unit 103. Output to.

  In step S <b> 404, the display image control unit 104 instructs the display region detection unit 102 to detect a display region. The display area detection unit 102 detects a display area in accordance with an instruction from the display image control unit 104 (generates display area information), and outputs the generated display area information to the color space setting unit 103. As described above, the display area information is generated using display format information and resolution information. The display format information used in this step is the display format information acquired in S401.

  In S <b> 405, the color space setting unit 103 associates the display area detected in S <b> 404 with the color space information acquired in S <b> 403, thereby representing a color space (set color space) for each display area. Generate a space setting table. The color space setting unit 103 outputs the generated color space setting table to the display setting unit 8 and instructs the display setting unit 8 to set display parameters. The display setting unit 8 sets display parameters corresponding to the set color space for each display area in accordance with an instruction from the color space setting unit 103. In this embodiment, a parameter management table (a table representing display parameters for each color space) as shown in FIG. 6 is prepared in advance. In FIG. 6, “backlight setting value” is a parameter used for backlight control, such as backlight emission luminance. The “signal processing set value” is a parameter used for correcting the image signal. The display setting unit 8 determines and sets display parameters corresponding to the set color space using the color space setting table and the parameter management table. In FIG. 6, three types of color spaces that are commonly used are illustrated, but other color spaces can be used. In FIG. 6, two types of parameters are illustrated as display parameters, but other parameters may be used.

  In step S406, the display image control unit 104 instructs the decoder 6 to decode the display target image acquired in step S402. The decoder 6 decodes the display target image (the display target image acquired in S <b> 402) in response to an instruction from the display image control unit 104, and develops the decoded display target image in the memory 5.

  In step S407, the display image control unit 104 instructs the display control unit 2 to display the display target image. In response to an instruction from the display image control unit 104, the display control unit 2 reads the display target image decoded in S406 from the memory 5, and reads the display target image and display format information (the display format information acquired in S401). ) To generate a display image. Then, the display control unit 2 outputs the generated display image to the display unit 3. Thereby, the display image is displayed.

According to the processing flow of FIG. 5, when a plurality of images are displayed simultaneously, the color space of the display target image displayed in the display area is set for each display area. Accordingly, when a plurality of images having different color spaces are displayed at the same time, the colors of the plurality of images displayed at the same time can be faithfully reproduced.
In S405, information representing display parameters for each display area may be generated as the color space setting table.

The flowchart in FIG. 5 is an example when it is assumed that a color space can be set for all display areas (when there is no upper limit to the number of areas in which the color space can be set). However, as described above, depending on the display device, there is an upper limit on the number of color spaces that can be set, and the color space may not be set for all display areas. A processing flow of the display device when there is an upper limit on the number of color spaces that can be set will be described with reference to the flowchart of FIG.
FIG. 7 is a flowchart illustrating an example of a processing flow (a processing flow until an image is displayed on the screen) of the display device according to the present embodiment.

  Since the process of S601-S604 is the same as the process of S401-S404, the description is abbreviate | omitted.

  Following S604, in S605, the color space setting unit 103 determines whether the number of display areas detected in S604 is greater than the maximum number of areas (the upper limit of the number of color spaces that can be set). If the number of display areas detected in S604 is equal to or less than the maximum number of areas (when a color space can be set for all display areas), the process proceeds to S606. If the number of display areas detected in S604 is greater than the maximum number of areas (when a display area where a color space cannot be set occurs), the process proceeds to S607. The maximum number of areas may be described in a program executed by the CPU 1 or may be stored in the storage unit 4 in advance. When the maximum number of areas is stored in advance in the storage unit 4, the color space setting unit 103 acquires the maximum number of areas from the storage unit 4, and the number of display areas detected in S604 and the acquired maximum area Compare the number.

  Since the process of S606 is the same as the process of S405, the description thereof is omitted.

  In step S607, the color space setting unit 103 selects a display area for setting the color space from the plurality of display areas detected in step S604. Details of the processing of S607 will be described later.

  Following S607, in S608, the color space setting unit 103 sets the color space of the display target image displayed in the display area for the display area selected in S607. Specifically, the color space setting unit 103 associates the display area selected in S607 with the color space information acquired in S603, thereby representing a color space that represents the color space for each display area selected in S607. Generate a table. Thereafter, similarly to S606 (S405), the color space setting unit 103 outputs the generated color space setting table to the display setting unit 8, and instructs the display setting unit 8 to set display parameters. The display setting unit 8 sets display parameters corresponding to the set color space for each display area in accordance with an instruction from the color space setting unit 103.

  Following S606 or S608, the processes of S609 and S610 are performed. Since the processing of S609 and S610 is the same as the processing of S406 and S407, respectively, description thereof is omitted.

Next, a method for selecting a display area (display area for setting a color space) in S607 will be described. Hereinafter, three methods (first to third methods) will be described as examples of the selection method.
The first method is a method of selecting a display area so that processing for setting a color space is preferentially performed for a display area having a large area. The process of S607 when the display area is selected by the first method will be described with reference to the flowchart of FIG.
First, in S1401, the area of each display area detected in S604 is calculated. The area of the display area is calculated using display area information, for example.
Next, in S1402, the display area having the maximum number of areas (upper limit of the number of color spaces that can be set) is selected as the display area for setting the color space in order from the display area having the large area calculated in S1401. When the maximum number of areas is 2 and three images 701 to 703 are displayed as shown in FIG. 11A, the display area of the image 701 and the display area of the image 703 are display areas for setting a color space. Selected as.
According to the first method, the area of the region where the color of the image can be faithfully reproduced can be maximized.

The second method is a method of selecting a display area so that processing for setting a color space is preferentially performed for a display area close to the center of the screen. The process of S607 when the display area is selected by the second method will be described with reference to the flowchart of FIG.
First, in S1501, the display position (position on the screen) of each display target image is obtained. Specifically, for each display target image, the coordinates (X, Y) of the position on the screen corresponding to the center position of the display target image are obtained. The position on the screen corresponding to the center position of the display target image is obtained using display area information, for example. The position on the screen corresponding to the center position of the display target image can also be obtained using display format information and resolution information. Note that the center position and the gravity center position of the display area may be obtained instead of the center position of the image.
Next, in S1502, for each display target image, the distance between the coordinates obtained in S1501 (the coordinates of the position on the screen corresponding to the center position of the display target image) and the coordinates of the center position of the screen is calculated. Is done.
In step S1503, the display area having the maximum number of areas is selected in order from the display area of the display target image having the short distance calculated in step S1502 as the display area for setting the color space. When the maximum number of areas is 2 and three images 704 to 706 are displayed as shown in FIG. 11B, the display area of the image 704 and the display area of the image 705 or the display area of the image 705 The display area of the image 706 is selected as the display area for setting the color space.
The user is likely to focus on the vicinity of the center of the screen. Therefore, according to the second method, it is possible to faithfully reproduce the color of an image considered to be noticed by the user.

The third method is a method of selecting a display area so that processing for setting a color space is preferentially performed for an area where an image in front is displayed. The process of S607 when the display area is selected by the third method will be described with reference to the flowchart of FIG.
First, in S1601, the position in the depth direction of each display target image is obtained. The position in the depth direction is obtained from display format information, for example.
Next, in step S1602, based on the position obtained in step S1601 (the position in the depth direction of each display target image), the display area having the maximum number of areas in order from the display area of the display target image in the foreground changes the color space. Selected as the display area to be set. When the maximum number of areas is 2 and three images 707 to 709 are displayed as shown in FIG. 11C, the display area of the image 708 and the display area of the image 709 are display areas for setting a color space. Selected as. Note that the image 708 is located behind the image 707.
The user is likely to focus on the image in front. Therefore, according to the third method, it is possible to faithfully reproduce the color of an image considered to be noticed by the user.

As described above, according to this embodiment, the color space of the image displayed in the display area is set for each display area. Accordingly, when a plurality of images having different color spaces are displayed at the same time, the colors of the plurality of images displayed at the same time can be faithfully reproduced.
In this embodiment, an example in which the display control device (CPU 1) is a part of the display device has been described. However, the display control device may be a separate device from the display device. In that case, the display control device may set display parameters in the display device. The display image may be generated in the display control device.
In addition, although the 1st-3rd method was demonstrated as an example of the selection method of a display area, the selection method of a display area is not restricted to these. For example, the display area for setting the color space may be randomly selected from the plurality of detected display areas. A display area designated by the user may be selected as a display area for setting a color space. The user may be notified that the number of display areas exceeds the upper limit without setting the color space for each display area.

<Example 2>
Hereinafter, a display control apparatus and a control method thereof according to Embodiment 2 of the present invention will be described.
When there are many images to be displayed, there is a possibility that the color space for each display area cannot be set in a short time. Therefore, when the display area changes with time, there may be a difference between the area where the color space of the display target image is set and the display area of the display target image. Such a shift leads to degradation of image quality. For example, when another display target image is displayed in an area where the color space of the display target image is set, the display color (color on the screen) of the other display target image is greatly deviated from the original color.
Therefore, in this embodiment, when a plurality of images are displayed simultaneously, a change in the display area is detected for each display target image. And the timing which sets a color space is controlled for every display area according to the speed of change. Specifically, among the plurality of display areas, the process of setting the color space is omitted for a display area that is changing at a speed equal to or higher than the threshold, and the display area that is changing at a speed lower than the threshold is changed. A color space (color space of a display target image) is set only for a display area that is not displayed. For a display area that changes at a speed equal to or higher than the threshold, the color space is set at a timing when the speed of change becomes less than the threshold.
When the display area changes at a high speed, the color difference due to the difference between the color space of the display target image and the set color space is hardly perceived by the user. On the other hand, when the speed of change of the display area is slow, the color difference due to the difference between the color space of the display target image and the set color space is easily perceived by the user. In this embodiment, the number of display areas for setting a color space at a time is reduced by the above-described method, so that the time required for setting the color space for each display area can be shortened. As a result, it is possible to more reliably reproduce the color of the image in which the color difference is easily perceived by the user.

Note that the color of an image displayed in a display area with a fast change speed is not faithfully reproduced. However, as described above, there is no problem because the color difference is hardly perceived in such a display area.
Further, when the speed of change of all the display areas is slow, there is a possibility that a deviation occurs between the area where the color space of the display target image is set and the display area of the display target image. However, even if such a shift occurs, the rate of change of the display area is slow, so the shift amount is small and the degradation of image quality is also small. Therefore, there is no problem even if the speed of change of all display areas is slow.
In the present embodiment, an example in which “change in display area” is movement of a display area (display target image) will be described, but “change in display area” is not limited to this. The “change in the display area” may be, for example, a change including at least one of movement of the display area, enlargement of the display area, reduction of the display area, and rotation of the display area.

Since the overall configuration of the display device according to the present embodiment is the same as that of the first embodiment (FIG. 1), description thereof is omitted.
The configuration of the CPU 1 according to the present embodiment will be described. FIG. 12 is a block diagram illustrating an example of the functional configuration of the CPU 1 (display control device) according to the present embodiment.

The color space acquisition unit 801 has the same function as the color space acquisition unit 101 of FIG.
The display area detection unit 802 has the same function as the display area detection unit 102 in FIG.

When the color space setting unit 803 receives color space information from the color space acquisition unit 801, display area information from the display region detection unit 802, and speed information from a speed detection unit 805, which will be described later, Using the information, a color space is set for each display area. Specifically, the color space acquisition unit 801 sets a color space only for a display area that changes at a speed less than a threshold or a display area that does not change based on the speed information. The speed information is information representing the moving speed of each display target image. The threshold value is a value predetermined by the manufacturer or user. The threshold value may be set according to the number of display target images. For example, the threshold value may be set so as to decrease as the number of display target images increases.

The display image control unit 804 has the same function as the display image control unit 104 in FIG. However, when the display target image is displayed, the display image control unit 804 outputs motion information indicating the motion of each display target image to the speed detection unit 805, and the speed detection unit 805 indicates the movement speed of each display target image. Instruct detection. In this embodiment, when the display target image is displayed, display is performed such that the display target image slides in from the outside of the screen to the final display position. The display format information includes information indicating the final arrangement of each display target image and the motion information.
The change in the display area is not limited to that caused by the display effect such as the slide-in described above. For example, the change in the display area may be caused by a user operation.
Further, the display format information is not limited to the information described above. For example, the display format information may be updated on a frame basis. In this case, the display format information may include only information indicating the arrangement of each display target image in the current frame. Information representing the arrangement in the previous frame (the arrangement of each display target image) and the arrangement in the current frame may be used as the motion information.

  The speed detection unit 805 detects the moving speed of each display target image (that is, the moving speed of each display area) based on the motion information input from the display image control unit 804. Then, the speed detection unit 805 outputs speed information representing a detection result (moving speed of each display area) to the color space setting unit 803.

A processing flow of the display device according to the present embodiment will be described with reference to the flowchart of FIG.
FIG. 13 is a flowchart illustrating an example of a processing flow of the display device according to the present embodiment. When the display target image is displayed, a display (slide-in display) is performed such that the display target image slides in from the outside of the screen to the final display position. FIG. 13 shows a processing flow until each display target image is displayed at the final display position. Note that it is assumed that one display parameter is set for the entire screen before the start of the processing flow of FIG.
FIG. 14 is a schematic diagram showing an example of the slide-in display. FIG. 14 shows an example in which five images 1004 to 1008 are displayed. Reference numeral 1001 in FIG. 14 indicates the arrangement of each image at time t. Reference numeral 1002 indicates the arrangement of each image at time t + 1 after time t. Reference numeral 1003 indicates the arrangement of each image at time t + 2 after time t + 1. The interval between time t and time t + 1 is the same as the interval between time t + 1 and time t + 2. The arrows in FIG. 14 indicate the moving direction of the image. As can be seen from the arrangements 1001 to 1003, in the example of FIG. 14, the moving speed decreases as the display position approaches the final display position.

  Since the process of S901-S903 is the same as the process of S401-S403, the description is abbreviate | omitted.

  Following S903, in S904, the display image control unit 804 instructs the speed detection unit 805 to detect the movement speed of the display target image. The speed detection unit 805 detects the moving speed of the display target image (the display target image acquired in S902) in response to an instruction from the display image control unit 804. In S904, the moving speed at each time (each frame) within the period during which the slide-in display is performed is detected.

  In step S905, the display image control unit 804 instructs the display region detection unit 802 to detect the display region. The display area detection unit 802 detects a display area in accordance with an instruction from the display image control unit 804 (generates display area information), and outputs the generated display area information to the color space setting unit 103. In S905, a display area at each time within the period during which the slide-in display is performed is detected, and information representing the display area at each time within the period during which the slide-in display is performed is generated as display area information.

  FIG. 15 shows an overview of the speed information and display area information obtained in S904 and S905. FIG. 15 is a diagram showing an example of speed information and display area information when the slide-in display shown in FIG. 14 is performed. In this embodiment, a table as shown in FIG. 15 is generated and used for each display target image. The table in FIG. 15 is a table representing speed information and display area information for one display target image, and is a table representing the display area and the moving speed for each time.

  Following S905, in S906, the display image control unit 804 instructs the decoder 6 to decode the display target image acquired in S402. The decoder 6 decodes the display target image in accordance with an instruction from the display image control unit 804, and develops the decoded display target image in the memory 5.

  Subsequent to S906, until the slide-in display is completed (until each display target image is displayed at a final display position), the processing of S907 to S912 is repeated, and the color space is set for each frame.

  In step S907, the display image control unit 804 determines the arrangement of each display target image in the current frame from the display form information. Then, the display image control unit 804 generates current arrangement information indicating the arrangement of each display target image in the current frame and stores it in the memory 5.

  Next, in S908, the color space setting unit 803 selects one display target image (the display target image acquired in S902) as a processing target image. Then, the color space setting unit 803 uses the input speed information to determine whether or not the moving speed of the processing target image in the current frame is greater than or equal to a threshold value. The threshold value is stored in advance in the storage unit 4, for example. The color space setting unit 803 reads the threshold value from the storage unit 4 and performs the comparison. If the moving speed of the processing target image is less than the threshold, the process proceeds to S909. If the moving speed of the processing target image is equal to or higher than the threshold, the process proceeds to S910.

  In step S909, the color space setting unit 803 sets the color space of the processing target image in the display area of the processing target image. The color space setting method is the same as that in the first embodiment (the processing method in S405). Following S909, the process proceeds to S910.

  In step S910, the color space setting unit 803 determines whether all display target images have been selected as processing target images. If all display target images have been selected as processing target images, the process proceeds to S911. If there is a display target image that is not selected as the processing target image, the process returns to S907. In step S907, a display target image that is not selected as a processing target image is selected as a processing target image.

In step S911, the display image control unit 804 instructs the display control unit 2 to display a display target image. In response to an instruction from the display image control unit 804, the display control unit 2 reads the display target image decoded in S906 and the current arrangement information generated in S907 from the memory 5. Then, the display control unit 2 generates a display image for the current frame using the read display target image and the current arrangement information, and outputs the generated display image to the display unit 3. Thereby, the display image is displayed.
Note that if the processing of S908 to S910 is not completed within one frame period, the display is not performed. Therefore, the processing of S911 may be performed in synchronization with the vertical synchronization signal.

  Next, in S912, the display image control unit 804 determines whether or not the slide-in display is completed. When the slide-in display is completed, this flow ends. If the slide-in display has not been completed, the processing from S907 is performed after a predetermined time has elapsed. The processing of S907 to S912 is performed in synchronization with the vertical synchronization signal, for example.

FIG. 16 is a graph showing an example of the relationship between the change in the moving speed of the image and the setting timing of the color space. FIG. 16 shows a graph for the image 1004 of FIG. FIG. 16 also includes a schematic diagram showing display areas of the respective images from time t to t + 2.
FIG. 16 shows that the moving speed of the image 1004 falls below the threshold at time t + 1. Therefore, the setting of the color space (color space of the image 1004) for the display area of the image 1004 is performed at the timing of time t + 1.
Note that the threshold may be greater than 0 or 0. If the threshold is 0, the color space is set at the timing when the image is completely stationary.

  As described above, according to the present embodiment, the process of setting the color space for the display area changing at a speed equal to or higher than the threshold among the plurality of display areas is omitted. Thereby, even when it is not possible to set the color space for each display area in a short time due to the restriction of the processing ability to set the color space, the user can be made to perceive the correct color.

CPU 1
102,802 Display area detection unit 103,803 Color space setting unit

Claims (12)

A display control device that controls a display device that displays an image with display parameters corresponding to a set color space,
When displaying a plurality of images at the same time on the display device, for each image to be displayed, detection means for detecting a region where the image is displayed from the screen of the display device;
For each area detected by the detection means, setting means for setting the color space of the image displayed in the area for the area;
A display control device comprising: There is an upper limit to the number of areas where the color space can be set,
2. The method according to claim 1, wherein when the number of regions detected by the detection unit is greater than the upper limit, the setting unit preferentially performs a process of setting a color space for a region having a large area. The display control apparatus described. There is an upper limit to the number of areas where the color space can be set,
The setting means preferentially performs a process of setting a color space for an area close to the center of the screen when the number of areas detected by the detecting means is larger than the upper limit. Item 4. The display control device according to Item 1. There is an upper limit to the number of areas where the color space can be set,
When the number of areas detected by the detection means is greater than the upper limit, the setting means preferentially performs a process of setting a color space for an area in which an image in front is displayed. The display control device according to claim 1. The said setting means omits the process which sets a color space with respect to the area | region which is changing at the speed more than a threshold value among the several area | regions detected by the said detection means. The display control apparatus according to any one of the above. The display control apparatus according to claim 5, wherein the change in the region includes at least one of region movement, region expansion, region reduction, and region rotation. A control method of a display control device for controlling a display device that displays an image with display parameters corresponding to a set color space,
When displaying a plurality of images on the display device at the same time, for each image to be displayed, a detection step of detecting a region where the image is displayed from the screen of the display device;
For each area detected in the detection step, a setting step for setting a color space of an image displayed in the area for the area;
A display control apparatus control method comprising: There is an upper limit to the number of areas where the color space can be set,
8. The process for setting a color space for a region having a large area is preferentially performed in the setting step when the number of regions detected in the detection step is greater than the upper limit. A control method for the display control device according to claim 1. There is an upper limit to the number of areas where the color space can be set,
When the number of areas detected in the detection step is larger than the upper limit, the setting step preferentially performs a process of setting a color space for an area close to the center of the screen. The control method of the display control apparatus according to claim 7. There is an upper limit to the number of areas where the color space can be set,
When the number of areas detected in the detection step is larger than the upper limit, in the setting step, processing for setting a color space is preferentially performed for an area in which an image in front is displayed. A control method for a display control device according to claim 7. 8. The setting step omits a process of setting a color space for a region that is changing at a speed equal to or higher than a threshold among a plurality of regions detected in the detection step. The control method of the display control apparatus according to any one of 10. The method of controlling a display control apparatus according to claim 11, wherein the change of the area includes at least one of movement of the area, expansion of the area, reduction of the area, and rotation of the area. .

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