JP2012047925A - Image display apparatus, image display method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display apparatus that suppresses the reduction in visibility of an image for superposition.SOLUTION: An image display apparatus 100 includes a first determination part 2c that determines a display position of an image for superposition in an area having a color different from the color of the image for superposition that is displayed superposed on a predetermined display image that is displayed on a display screen of a display 1.

Description

  The present invention relates to an image display device, an image display method, and a program.

  Conventionally, an image display device such as a so-called digital photo frame is known (for example, see Patent Document 1). Some image display devices can display the current time superimposed on the image displayed on the display screen.

JP 2009-45139 A

  By the way, the display position of the current time on the display screen may be designated as a predetermined position in advance.For example, when displaying a black time display superimposed on an image with many black background areas such as a night view, If the time display overlaps the black background area, it will be difficult to see because of the similar color.

  Accordingly, an object of the present invention is to provide an image display device, an image display method, and a program that can suppress a decrease in the visibility of an image for superimposition.

In order to solve the above problems, an image display device according to the present invention provides:
A display unit configured to display a predetermined image on a display screen; and a region of a color different from a color of an image for superimposition displayed on the predetermined image in the predetermined image displayed on the display screen. Determining means for determining the display position of the superimposing image.

The image display method of the present invention includes:
An image display method using an image display device including display means for displaying a predetermined image on a display screen, wherein the predetermined image displayed on the display screen is superimposed on the predetermined image. A process for determining a display position of the image for superimposition is performed in an area having a color different from the color of the image for superimposition.

The program of the present invention is
A computer of an image display device comprising display means for displaying a predetermined image on a display screen, and a color of an image for superimposing displayed on the predetermined image in the predetermined image displayed on the display screen, It is characterized by functioning as a determining means for determining the display position of the superimposing image in different color areas.

  According to the present invention, it is possible to superimpose and display the superimposing image on a region of a color different from the color of the superimposing image in the predetermined image, and it is possible to suppress a decrease in the visibility of the superimposing image.

It is a block diagram which shows schematic structure of the image display apparatus of one Embodiment to which this invention is applied. 3 is a flowchart illustrating an example of an operation related to image display processing by the image display apparatus of FIG. 1. 3 is a flowchart illustrating an example of an operation related to a superposition position determination process in the image display process of FIG. 2. It is a figure which shows typically an example of the display image which concerns on the image display process of FIG. It is a figure which shows typically an example of the image for superimposition which concerns on the image display process of FIG. It is a block diagram which shows schematic structure of the image display apparatus of the modification 1. It is a flowchart which shows an example of the operation | movement which concerns on the superposition position determination process in the image display process by the image display apparatus of FIG. It is a figure which shows typically an example of the display image which concerns on the image display process of FIG.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
FIG. 1 is a block diagram showing a schematic configuration of an image display apparatus 100 according to an embodiment to which the present invention is applied.

The image display apparatus 100 according to the present embodiment superimposes a predetermined display image G (see FIG. 4A and the like) displayed on the display screen of the display unit 1 so as to be superimposed on the predetermined display image G. The display position of the superimposing image T is determined in an area of a color different from the color of the working image T (see FIG. 5A, etc.).
Specifically, the image display device 100 is, for example, a digital photo frame or the like installed on a table. As shown in FIG. 1, the display unit 1, the superimposed position determining unit 2, the time measuring unit 3, and the memory 4, display image recording unit 5, superimposing image recording unit 6, operation input unit 7, and central control unit 8.

The display unit 1 includes a display panel 1a and a display control unit 1b.
As the display panel 1a, for example, a substantially rectangular liquid crystal display panel or organic EL display in which a plurality of dots corresponding to R (red), G (green), and B (blue) color components are arranged in a matrix on the surface. A panel (not shown) may be mentioned, but the invention is not limited to these.

  The display control unit 1b acquires image data of a predetermined display image recorded in the display image recording unit 5, and displays this image data on the display screen of the display panel 1a. Specifically, the display control unit 1b selects desired image data selected based on a predetermined operation of the operation input unit 7 by the user from among a plurality of image data recorded in the display image recording unit 5, for example. Obtained from the display image recording unit 5 and displayed on the display screen. Further, for example, when a plurality of image data recorded in the display image recording unit 5 is selected by the user, the display control unit 1b sequentially acquires the plurality of image data, and obtains the image data as a predetermined value. A so-called slide show reproduction display, which is switched at intervals and displayed on the display screen, is performed.

For example, even when a user selects a predetermined folder for storing a plurality of image data in the display image recording unit 5, the display control unit 1b sequentially stores each of the plurality of image data in the predetermined folder. These image data may be acquired and displayed as a slide show.
Further, for example, when one moving image stored in the display image recording unit 5 is selected by the user, the display control unit 1b selects a plurality of image frames constituting the moving image at a predetermined reproduction frame rate. The moving image may be reproduced and displayed by switching with.
In addition, the display control unit 1b is a predetermined one that is automatically selected from a plurality of image data recorded in the display image recording unit 5 in accordance with a predetermined selection criterion (for example, the imaging date / time or the latest recording date / time). The image data may be acquired from the display image recording unit 5 and displayed on the display screen.
Thus, the display unit 1 constitutes a display unit that displays a predetermined image on the display screen.

  The display control unit 1b determines that the number of pixels (dots) on the display panel 1a does not match the number of pixels on a predetermined display image G (image frame in a moving image) displayed on the display panel 1a. The display image may be displayed in a predetermined display area (for example, substantially the entire display area) of the display panel 1a by reducing or enlarging the image data of the display image at a predetermined magnification.

Further, the display control unit 1b acquires image data of a superimposition image T (for example, a time display image) recorded in the superimposition image recording unit 6, and displays this image data on the display screen of the display panel 1a. Let Specifically, the display control unit 1b displays the image T for superimposition on the display image displayed on the display screen.
Here, the display position of the superimposition image T is, for example, in a default state, a predetermined superimposition reference position (for example, the vicinity of any one corner of the display screen) in the display image (display screen). Thus, the superimposing image T is displayed such that the center coordinates of the predetermined superimposition reference position overlap the central coordinates of the superimposing image T. Further, when the display position of the superimposing image T is newly determined in the display process described later, the display position of the superimposed image is changed according to the determined position. That is, the display control unit 1b displays the superimposed image T superimposed on the image displayed on the display screen at the determined display position of the superimposed image T (described later).

  The superposition position determination unit 2 includes a first calculation unit 2a, a determination unit 2b, and a first determination unit 2c.

The first calculation unit 2a is configured to select a color of a superimposition image T (for example, a clock display image, a weather forecast display image, a sticky note display image, etc .; described later) and a predetermined display image G displayed on the display unit 1. The degree of similarity with the color of the boundary portion with the superimposition image T displayed superimposed on the superimposition reference position is calculated.
Here, the predetermined display image G may be one still image displayed on the display unit 1 or each of a plurality of still images related to the slide show reproduction display by the display unit 1. Each of a plurality of image frames constituting one moving image may be used.

Specifically, the first calculation unit 2a includes a pixel value calculation unit a1 and a similar pixel specifying unit a2.
The pixel value calculation unit a1 receives the image data of the superimposing image T (for example, a clock display image) designated by the central control unit 8 based on a predetermined operation of the operation input unit 7 by the user from the superimposing image recording unit 6. The pixel value of each pixel representing the superimposing image T is calculated based on the acquired image data. Specifically, the pixel value calculation unit a1 calculates, for example, the luminance value of each pixel constituting the edge of the superimposing image T as each pixel representing the superimposing image T.
Here, the luminance value of each pixel is a value representing the luminance calculated by converting the RGB value of each pixel according to a predetermined conversion formula. For example, the value of Y (luminance) in the YUV color space is Can be applied.
Further, the edge of the image T for superimposition is, for example, the outer edge of the portion itself related to information display such as characters, numbers, symbols, etc. representing the current time, date, day of the week, etc. when the image T for superimposition is a clock display image. It may be a part or an outer edge part of a frame image surrounding a part related to the information display. Similarly, for example, when the superimposition image T is a weather forecast display image, it is an outer edge portion of the portion itself related to information display such as letters, numbers, symbols, and status display marks representing the current weather and temperature. Alternatively, it may be an outer edge portion of a frame image surrounding a portion related to the information display. For example, when the superimposition image T is a sticky note display image, a background image of a predetermined color is generally displayed on the background of characters, numbers, symbols, and the like. It may be the outer edge of the part itself related to information display such as numbers and symbols, or may be the outer edge of the background image of the part related to the information display.
In addition, when the form of the superimposing image T is, for example, an annular shape or has an inner edge formed independently of the outer edge, the inner edge of the superimposing image T is formed at the edge of the superimposing image T. However, in the following description, the outer edge portion of the superimposing image T will be described as an edge portion unless specifically limited to the inner edge portion.

Further, the pixel value calculation unit a1 acquires image data of a predetermined display image G designated by the central control unit 8 based on a predetermined operation of the operation input unit 7 by the user from the display image recording unit 5, and the image data Based on the image data of the superimposing image T, the luminance value of each pixel at the boundary between the superimposing image T and the superimposing image T displayed on the predetermined display image G is calculated. That is, when it is assumed that the pixel value calculation unit a1 superimposes and displays the superimposition image T on a predetermined superimposition reference position of the predetermined display image G displayed on the display unit 1 (see FIG. 4A). Then, the luminance value of each pixel Eb in a portion adjacent to each pixel Ea constituting the boundary portion between the predetermined display image G and the superimposing image T, that is, the outer edge portion of the superimposing image T is calculated.
4A illustrates a state in which the predetermined display image G and the superimposing image T are not actually displayed on the display unit 1 of the image display apparatus 100, but are in a predetermined superimposition reference position of the predetermined display image G. The case where it is assumed that the image T for superimposition is superimposed and displayed is schematically represented. 4 (a) and 4 (b), as the predetermined display image G, an image of a night view in which “moon” and “lighted tower” are imaged is illustrated. "And the area other than" lighted up tower "are shown with dots as dark parts. In addition, the clock display image exemplified as the superimposition image T is displayed in black, for example.

Here, in the predetermined display image G, each pixel Eb that constitutes the outer edge portion of the image for superimposition T is adjacent to each pixel Ea that is adjacent to each pixel Ea that constitutes the outer edge portion of the image T for superimposition. A pixel that is arranged adjacent to one of the upper, lower, left, and right sides of Ea and that is a pixel other than each pixel Ea that constitutes the outer edge of the superimposed image T (see FIG. 5A and FIG. 5). (Refer FIG.5 (b)). Therefore, pixels that are not adjacent to any one of the upper, lower, left, and right sides of each pixel Ea that forms the outer edge of the superimposing image T, that is, any one of the upper, lower, left, right, upper, left, right, etc. Pixels deviated from one side are not included. The position of each pixel is determined based on, for example, coordinates (xa, ya) in the x-axis direction and the y-axis direction when a predetermined position is used as a reference point.
For example, as shown in FIG. 5A, when the clock display image is a superimposition image T, the region surrounded by the two-dot chain line in FIG. 5A is enlarged and schematically shown in FIG. , Each pixel constituting the outer edge portion of the superimposing image T of the superimposing image T is represented as a pixel Ea,..., And is adjacent to the pixel Ea when the superimposing image T is superimposed on a predetermined display image G. Each pixel in the portion is represented as a pixel Eb,.

  Since the number of pixels (dots) on the display panel 1a and the number of pixels of the predetermined display image G (image frame in the moving image) do not match, the image data of the display image is reduced or enlarged at a predetermined magnification. In this case, the pixel value calculation unit a1 specifies each pixel Eb in a portion adjacent to each pixel Ea constituting the outer edge portion of the superimposition image T based on the image data after the reduction process and the enlargement process. Shall. In this case, the image data after the reduction process and the enlargement process is also used in other processes of the superposition position determination unit 2 described later, but in the following description, in the following description, pixels (dots) of the display panel 1a are used. It is assumed that the number matches the number of pixels of the predetermined display image G.

The similar pixel specifying unit a2 specifies a pixel having a luminance value similar to the luminance value of the pixel of the adjacent superimposing image T for each pixel at the boundary between the predetermined display image G and the superimposing image T.
That is, for example, for each pixel Eb at the boundary between the superimposition image T in the predetermined display image G and the similar pixel specifying unit a2, the luminance value and the pixel Ea constituting the outer edge portion of the superimposition image T adjacent to the luminance value. Compare the brightness value. Subsequently, the similar pixel specifying unit a2 specifies a pixel Eb whose luminance value difference between these pixels Ea and Eb is within a predetermined range as a pixel having the same luminance. Specifically, for example, when the luminance level is expressed by 8 bits (256 levels), the similar pixel specifying unit a2 determines the luminance among the pixels Eb at the boundary between the predetermined display image G and the superimposed image T. A pixel having a value difference of about ± 10 is specified as a pixel having the same luminance.

In addition, although the pixel Eb of the boundary part with the image T for superimposition in the predetermined display image G illustrated the pixel Eb of the part adjacent to each pixel Ea which comprises the outer edge part of the image T for superimposition, it is restricted to this. For example, in addition to the pixel Eb adjacent to each pixel Ea constituting the outer edge of the superimposition image T, pixels other than the superimposition image T that are adjacent to the pixel Eb vertically and horizontally Further, pixels adjacent to the adjacent pixels in the vertical and horizontal directions may be included. In this case, a luminance value representative of these pixels (for example, an average value of luminance values) may be applied as the luminance value of each pixel at the boundary with the superimposing image T.
Similarly, each pixel Ea constituting the outer edge portion of the image for superimposition T is illustrated as each pixel representing the image for superimposition T. However, the present invention is not limited to this, and for example, the outer edge of the image for superimposition T In addition to each pixel Ea constituting the unit, the pixel other than the predetermined display image G includes a pixel adjacent to the pixel Ea vertically and horizontally, and a pixel adjacent to the adjacent pixel vertically and horizontally But it ’s okay. In this case, a luminance value representing these pixels (for example, an average value of luminance values) may be applied as the luminance value of each pixel representing the superimposition image T.

Then, the first calculation unit 2a is a boundary between the luminance value of each pixel Ea constituting the outer edge portion of the superimposing image T and the superimposing image T displayed at a predetermined superimposition reference position of the predetermined display image G. The similarity with the luminance value of each pixel Eb of the unit is calculated.
That is, the first calculation unit 2a determines the pixel Eb at the boundary with the superimposition image T displayed at the predetermined superimposition reference position of the predetermined display image G based on the identification result by the similar pixel identification unit a2. Among them, the ratio of the pixels Eb having a luminance value similar to the luminance value of each pixel Ea constituting the outer edge portion of the adjacent superimposing image T is calculated as the similarity. Specifically, the first calculation unit 2a includes the total number L of pixels Eb at the boundary with the superimposition image T in the predetermined display image G, and the number of pixels having the same luminance specified by the similar pixel specifying unit a2. m is calculated, and the ratio m / L of the number m of pixels having the same luminance in the total number L of pixels Eb at the boundary is calculated as the similarity. That is, as the value m / L of the number m of pixels with the same luminance in the total number L of pixels Eb at the boundary is calculated, the color of the outer edge portion of the superimposition image T and the predetermined display image G The degree of similarity with the color of the boundary with the superimposing image T increases.

Note that the similarity between the color of the outer edge portion of the superimposing image T and the color of the boundary portion between the predetermined display image G and the superimposing image T is calculated using, for example, a luminance value. This is an example, and the present invention is not limited to this, and can be arbitrarily changed as long as the similarity (difference) between these colors can be calculated quantitatively.
Further, the first calculation unit 2a calculates the similarity between the color of the outer edge portion of the superimposing image T and the color of the boundary portion of the predetermined display image G with the superimposing image T. The color of the image T for superimposition, that is, the color at the boundary between the image T for superimposition of the predetermined display image G and the representative color such as the average color of each pixel constituting the image T for superimposition. The similarity may be calculated.
As described above, the first calculation unit 2a calculates the color of the superimposing image T designated by the central control unit 8 and the superimposing image T displayed superimposed on the predetermined reference position of the predetermined display image G. A calculating means for calculating the similarity with the color of the boundary portion is configured.

In addition, when the candidate position of the display position of the superimposition image T is determined by the candidate determination unit c1 of the first determination unit 2c (described later), the first calculation unit 2a determines the color of the outer edge portion of the superimposition image T. And the degree of similarity between the color of the boundary with the superimposition image T displayed at the candidate position of the display position determined by the candidate determination unit c1 in the predetermined display image G is calculated again. That is, the first calculation unit 2a, every time the candidate determination unit c1 of the first determination unit 2c determines the candidate position of the display position of the image for superimposition T, The similarity between the display image G and the color of the boundary with the superimposition image T displayed at the candidate position of the display position determined by the candidate determination unit c1 is calculated.
Note that the similarity calculation method by the first calculation unit 2a is the same as that described above, and the first calculation unit 2a is, for example, a ratio of the number m of pixels having the same luminance in the total number L of pixels Eb at the boundary. m / L is calculated as the similarity.

The determination unit 2b determines whether the similarity calculated by the first calculation unit 2a is equal to or greater than a predetermined value.
Specifically, the determination unit 2b uses the pixel Eb at the boundary between the similarity calculated by the first calculation unit 2a, that is, the superimposition image T displayed at a predetermined superimposition reference position in the predetermined display image G. It is determined whether or not the ratio m / L of the number m of pixels Eb having the same luminance specified by the similar pixel specifying unit a2 is equal to or greater than a predetermined value (for example, 0.2).
Note that the predetermined value serving as the determination criterion of the similarity by the determination unit 2b may be set to “0”, for example, and in this case, the pixel at the boundary between the predetermined display image G and the superimposition image T If there is a pixel having the same luminance among Eb, the determination unit 2b determines that the similarity is equal to or higher than a predetermined value.
Here, the determination unit 2b constitutes a determination unit that determines whether the similarity calculated by the first calculation unit 2a is equal to or greater than a predetermined value.

In addition, when the candidate determination unit c1 of the first determination unit 2c determines the candidate position of the display position of the superimposition image T (described later), the determination unit 2b calculates the similarity again by the first calculation unit 2a. Then, it is determined whether or not the similarity is a predetermined value or more. That is, every time the similarity is calculated by the first calculation unit 2a, the determination unit 2b determines whether the calculated similarity is equal to or greater than a predetermined value.
In this case, the predetermined value that is the determination criterion for the similarity by the determination unit 2b may be the same value every time or may be changed each time. That is, for example, by gradually reducing the predetermined value as the determination criterion as the number of determinations increases, the determination criterion is gradually tightened, and the display position having a lower similarity by the first determination unit 2c, that is, the superimposed image. A display position where T can be easily identified may be specified. Further, by gradually increasing the predetermined value as the determination criterion as the number of determinations increases, the determination criterion is gradually relaxed so that the display position of the superimposed image T can be quickly identified by the first determination unit 2c. Anyway.

The first determination unit 2 c determines the display position of the superimposition image T in the predetermined display image G displayed on the display unit 1.
In other words, when the determination unit 2b determines that the similarity is greater than or equal to a predetermined value, the first determination unit 2c applies the superimposition image to a region having a color different from the color of the superimposition image T in the predetermined display image G. The display position of T is determined. Specifically, the first determination unit 2c includes a candidate determination unit c1 that determines a candidate position of the display position of the superimposition image T in the predetermined display image G, and the superimposition determined by the candidate determination unit c1. The display position of the superimposition image T in the predetermined display image G is determined from the candidate positions for the display position of the image T.

When the determination unit 2b determines that the similarity is greater than or equal to a predetermined value, the candidate determination unit c1 moves the central portion of the superimposition image T from the predetermined overlap reference position in a predetermined direction by a predetermined distance. A candidate position of the display position of the superimposed image T in the predetermined display image G is determined. Specifically, the candidate determination unit c1 displays the superimposing image T so that the central portion of the superimposing image T exists at a position of a color different from the representative color of the superimposing image T in the predetermined display image G. Determine candidate positions.
For example, the candidate determination unit c1 first divides the luminance values of all the pixels of the predetermined display image G or the predetermined display image G into a plurality of predetermined areas, and about one pixel representing each predetermined area. A luminance value is calculated. Then, based on the calculated luminance value, the candidate determining unit c1 determines that the predetermined display image G has the same luminance as the average value of the luminance values of the pixels Ea constituting the outer edge portion of the superimposing image T. Divide into areas and other dissimilar areas. Note that the method for specifying a similar region and a non-similar region is, as in the above-described method for specifying by the similar pixel specifying unit a2, a pixel in which the difference in luminance value between pixels is within a predetermined range is defined as a pixel constituting the similar region. Other pixels may be used as pixels constituting the dissimilar region.
Then, the candidate determining unit c1 moves the central portion (center coordinates) of the superimposing image T from the superimposition reference position in a predetermined direction (for example, the right direction), and the central portion of the superimposing image T is a dissimilar region. The place that enters is set as a candidate position for the display position of the superimposing image T.

Here, when the determination unit 2b determines that the similarity is greater than or equal to a predetermined value, the candidate determination unit c1 moves the center of the superimposition image T from the predetermined reference position in a predetermined direction by a predetermined distance. Thus, candidate determination means for determining a candidate position of the display position of the superimposed image T in a predetermined image is configured.
Note that, for example, the luminance value of the pixel is used to specify the position of a color different from the representative color of the superimposition image T in the predetermined display image G, but this is an example, and the present invention is not limited to this. As long as the similarity (dissimilarity) with the representative color of the image T can be calculated quantitatively, it can be arbitrarily changed. Moreover, although the average value of the luminance value of each pixel of the outer edge portion is illustrated as the representative color of the image T for superimposition, the present invention is not limited to this. For example, the median value or the mode value of the luminance value is applied. Also good. Furthermore, for example, an average value, a median value, a mode value, or the like of the luminance values of the pixels of the entire superimposing image T may be applied as the representative color of the superimposing image T.

Thereafter, the first calculation unit 2a uses the color of the image T for superimposition and the color of the boundary between the image T for superimposition displayed at the candidate position of the display position determined by the candidate determination unit c1 in the predetermined display image G. The similarity with is calculated again. Specifically, as described above, the first calculation unit 2a calculates, for example, a ratio m / L of the number m of pixels having the same luminance in the total number L of pixels Eb at the boundary as the similarity.
Subsequently, the determination unit 2b determines whether or not the similarity calculated again by the first calculation unit 2a is greater than or equal to a predetermined value. Specifically, the determination unit 2b specifies a similar pixel among the similarities calculated by the first calculation unit 2a, that is, the total number L of pixels Eb at the boundary between the predetermined display image G and the superimposition image T. It is determined whether the ratio m / L of the number m of pixels having the same luminance specified by the part a2 is equal to or greater than a predetermined value (for example, 0.2).
As a result of the determination by the determination unit 2b, the first determination unit 2c determines a candidate position where the similarity is determined not to be greater than or equal to a predetermined value as a region having a color different from the color of the outer edge portion of the superimposed image T in the predetermined display image The display position of the superimposed image T is determined. That is, when the determination by the determination unit 2b determines that the similarity is not equal to or higher than the predetermined value, the first determination unit 2c can easily identify the superimposed image T displayed at the candidate position. Is determined as the display position of the superimposing image T.

On the other hand, if it is determined by the determination unit 2b that the similarity is greater than or equal to a predetermined value, it is still difficult to identify the superimposition image T displayed at the candidate position. The part c1 determines again the candidate position of the display position of the superimposing image T in the predetermined display image G by moving the central part of the superimposing image T in a predetermined direction by a predetermined distance. Specifically, the candidate determination unit c1 determines the candidate position of the display position of the superimposing image T by moving the central portion (center coordinates) of the superimposing image T by a predetermined number of pixels in the same direction as the previous time. .
Here, the moving distance of the superimposing image T may be one pixel, or in order to shorten the calculation time, the moving distance is equal to the number of pixels between the central portion of the superimposing image T and the end portion on the moving direction side. (For example, 100 pixels in the case of the superimposition image T having a left-right width of 200 pixels) or a predetermined ratio of the number of pixels between the central portion of the superposition image T and the end portion on the moving direction side ( For example, it may be 1/4). For example, when the superimposition image T is moved rightward from the superimposition reference position and the right end of the superimposition image T comes into contact with the right end of the display image, the center direction of the display image (for example, the superimposition image When T is located at the lower part of the display image, it may be moved upward, and conversely, when T is located at the upper part, it may be moved downward. Also in this case, the moving distance of the superimposing image T may be one pixel, as described above, and the central portion (center coordinate) of the superimposing image T and the moving direction for shortening the calculation time. The number of pixels between the side edge and the number of pixels (for example, 20 pixels in the case of the superimposing image T having a vertical width of 40 pixels), or the center of the superimposing image T and the end on the moving direction side It may be a predetermined ratio (for example, 1/4 or the like) of the number of pixels between.
Thereafter, similar to the above, the calculation of the similarity by the first calculation unit 2a and the determination of the similarity by the determination unit 2b are performed.
The above processing is performed until the determination by the determination unit 2b determines that the similarity is not equal to or greater than a predetermined value.
As described above, the first determination unit 2c selects candidate positions that are determined by the determination unit 2b that the similarity is not greater than or equal to a predetermined value among the candidate positions of the display position of the superimposition image T determined by the candidate determination unit c1. Then, the display position of the superimposing image T is determined as an area of a color different from the color of the superimposing image T in the predetermined display image G.

The first determining unit 2c determines the display position of the superimposing image T from the candidate positions of the superimposing image T determined by the candidate determining unit c1, but the superimposing image T The method for determining the display position is an example and is not limited to this, and can be arbitrarily changed as appropriate. That is, any method may be used as long as it can identify a region having a color different from the color of the superimposing image T in the predetermined display image G and determine the display position of the superimposing image T in the region. .
Here, the 1st determination part 2c comprises the determination means which determines the display position of the said image T for superimposition in the area | region of a color different from the color of the image T for superimposition in a predetermined image.

For example, although not shown, the timer unit 3 includes a timer, a timer circuit, and the like, and measures the current time to acquire time information. Further, the time measuring unit 3 may acquire calendar information by specifying a calendar such as a date or a day of the week based on the acquired time information.
Then, the time measuring unit 3 outputs the acquired time information and calendar information to the memory 4.

  The memory 4 is composed of, for example, a DRAM (Dynamic Random Access Memory) or the like, and temporarily stores data processed by the superposition position determining unit 2, the time measuring unit 3, the central control unit 8, and the like.

The display image recording unit 5 records still image or moving image image data displayed on the display panel 1a of the display unit 1, and still image data or a plurality of image frames encoded in a predetermined compression format. The moving image data consisting of is recorded. In addition, the image size of the still image includes, for example, a configuration in which the number of vertical × horizontal pixels is configured to be about vertical: 3000 × horizontal: 4000 (pixels), but is not limited to this example. And can be arbitrarily changed as appropriate. In addition, as the size of each image frame of a moving image, for example, a configuration in which the number of vertical × horizontal pixels is configured to be about vertical: 480 × horizontal: 640 (pixels) is an example. It can be arbitrarily changed as appropriate.
The display image recording unit 5 is configured by, for example, a non-volatile memory (flash memory) or the like. However, the display image recording unit 5 is an example and is not limited thereto.

The superimposing image recording unit 6 records image data of various superimposing images T.
Here, the image for superimposition T is an image that is superimposed and displayed on a predetermined still image or moving image displayed on the display screen of the display panel 1a of the display unit 1. The image size of the superimposing image T includes, for example, a configuration in which the number of vertical × horizontal pixels is configured to be about vertical: 40 × horizontal: 200 (pixels), but is an example and is not limited thereto. It is not a thing and it can change arbitrarily arbitrarily.
Examples of the type of the superimposing image T include a clock display image that displays the current time, a weather forecast display image that displays the current and future weather and temperature (including weather and climate), and the like. A sticky note display image or the like that displays a memo note like a sticky note is an example, and is not limited to this, and can be arbitrarily changed as appropriate.

The clock display image is composed of image data used for displaying a clock that changes over time, such as characters, numbers, and symbols of a predetermined font. Then, according to the time information and calendar information acquired by the time measuring unit 3, image data corresponding to the current time, date, day of the week, and the like is appropriately read from the superimposing image recording unit 6 and output to the display control unit 1b. . Here, the clock display image may be composed of image data such as characters, numbers, symbols, etc. used only for information display such as the current time, date, day of the week, etc. It may be an image including a surrounding frame image (for example, an image having a substantially rectangular shape or an oval shape) or a predetermined background image represented in the frame image.
In addition, the weather forecast display image changes with time such as letters, numbers, symbols, status display marks (eg, “sunny”, “rain”, etc.) in a predetermined font, for example, like the clock display image. Image data used for displaying the weather. Then, according to the weather information acquired by a weather information acquisition unit (not shown), image data corresponding to the current or future weather, temperature, etc. is appropriately read from the superimposition image recording unit 6 and output to the display control unit 1b. .
Further, the tag display image may be created in advance based on a predetermined operation of the image display device 100 or an external device by the user in advance, or the current date automatically generated according to the calendar information It may be data relating to notifications such as anniversaries and events corresponding to.

  The superimposing image recording unit 6 is configured by, for example, a non-volatile memory (flash memory) or the like, but is only an example and is not limited thereto.

  The operation input unit 7 includes an operation unit configured by, for example, data input keys for inputting numerical values, characters, and the like, up / down / left / right movement keys for performing data selection, feeding operation, and various function keys. A predetermined operation signal is output to the central control unit 8 in accordance with the operation of these operation units.

In addition, the operation input unit 7 centralizes a designation signal for a desired superposition image T selected from various superposition images T recorded in the superposition image recording unit 6 based on a predetermined operation by the user. Output to the control unit 8.
The central control unit 8 superimposes the superimposition image T corresponding to the input designation signal on the predetermined superimposition reference position of the predetermined image displayed on the display screen of the display unit 1. Designated as T.

  The central control unit 8 controls each unit of the image display device 100. Specifically, although not shown, the central control unit 8 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), and a ROM (Read Only Memory), and various processing programs for the image display device 100 ( Various control operations are performed according to (not shown).

Next, image display processing will be described with reference to FIGS.
FIG. 2 is a flowchart illustrating an example of an operation related to image display processing by the image display apparatus 100. FIG. 3 is a flowchart illustrating an example of an operation related to the overlapping position determination process in the image display process.
In the image display processing described below, a black clock display image is used as the superimposing image T.

  As shown in FIG. 2, first, a desired display image is selected from image data of a plurality of display images recorded in the display image recording unit 5 based on a predetermined operation of the operation input unit 7 by the user. Then, the operation input unit 7 outputs a designation signal for the display image to the central control unit 8. The central control unit 8 designates a display image corresponding to the designation signal output from the operation input unit 7 and input as a display image displayed on the display screen of the display unit 1 (step S1).

  Subsequently, based on a predetermined operation of the operation input unit 7 by the user, a desired clock display image is selected from the plurality of image data of the superimposing images T,... Recorded in the superimposing image recording unit 6. When selected as T (see FIG. 5A and the like), the operation input unit 7 outputs a designation signal for the superimposing image T to the central control unit 8. The central control unit 8 superimposes the superimposition image T corresponding to the designation signal output from the operation input unit 7 and input on the predetermined superimposition reference position of the predetermined display image G displayed on the display screen of the display unit 1. This is designated as the superimposed image T displayed (step S2).

Next, the central control unit 8 causes the superposition position determination unit 2 to execute a superposition position determination process (see FIG. 3; described later) that determines the display position of the superposition image T in the predetermined display image G (step S3). .
After that, the display control unit 1b of the display unit 1 acquires the image data of the display image and the image data of the superimposing image T, displays the predetermined display image G on the display screen of the display panel 1a, and The superimposition image T is superimposed and displayed at the superimposition position determined by the superimposition position determination process in the display image G (step S4).
Thus, the image display process is terminated.

Hereinafter, the superposition position determination process will be described with reference to FIG.
As shown in FIG. 3, first, the pixel value calculation unit a1 of the first calculation unit 2a superimposes the image data of the superimposition image T (for example, a clock display image or the like) designated in step S2 of the image display process. The brightness value of each pixel Ea that is acquired from the image recording unit 6 and forms the outer edge of the superimposition image T is calculated based on the image data (step S11).
Here, for example, when acquiring image data of a clock display image as the superimposing image T, the pixel value calculation unit a1 determines the current time, date, and day of the week according to the time information and calendar information acquired by the time measuring unit 3. Are read from the image recording unit 6 for superimposition and acquired.

  Subsequently, the pixel value calculation unit a1 acquires the image data of the predetermined display image G designated in step S1 of the image display process from the display image recording unit 5, and the image data and the image data of the superimposition image T are displayed. Based on the above, the boundary portion of the predetermined display image G with the superimposition image T displayed superimposed on the predetermined superimposition reference position, that is, the portion adjacent to each pixel Ea constituting the outer edge portion of the superimposition image T The luminance value of each pixel Eb is calculated (step S12).

  Next, the first calculation unit 2a calculates the luminance value of each pixel Ea constituting the outer edge of the superimposition image T and the superimposition image T displayed at a predetermined superimposition reference position of the predetermined display image G. The similarity with the luminance value of each pixel Eb at the boundary is calculated (step S13). Specifically, the similar pixel specifying unit a2 of the first calculating unit 2a, for example, for each pixel Eb at the boundary between the predetermined display image G and the superimposing image T, the superimposing image T adjacent to the luminance value. Are compared with the luminance value of the pixel Ea that constitutes the outer edge portion, and a pixel Eb in which the difference in luminance value between these pixels Ea and Eb is within a predetermined range is specified as a pixel having the same luminance. Then, the first calculation unit 2a is specified by the total number L of pixels Eb at the boundary with the superimposition image T displayed at a predetermined superimposition reference position in the predetermined display image G, and the similar pixel specification unit a2. The number m of pixels having the same luminance is calculated, and the ratio m / L of the number m of pixels having the same luminance in the total number L of pixels Eb at the boundary is calculated as the similarity.

Subsequently, the determination unit 2b determines the similarity calculated by the first calculation unit 2a, that is, the total number L of the pixels Eb at the boundary with the superimposition image T in the predetermined display image G, the similar pixel specifying unit a2 It is determined whether or not the ratio m / L of the number m of pixels having the same luminance specified by (1) is equal to or greater than a predetermined value (for example, 0.2) (step S14).
Here, if it is determined that the similarity is not equal to or higher than the predetermined value (less than the predetermined value) (step S14; NO), the first determining unit 2c uses the predetermined overlapping reference position in the predetermined display image G for overlapping. It determines as a display position of the image T (step S15), and complete | finishes the said superimposition position determination process.

  On the other hand, if it is determined in step S14 that the degree of similarity is equal to or higher than the predetermined value (not lower than the predetermined value) (step S14; YES), the first determining unit 2c performs the superimposition image T in the predetermined display image G. Is changed (step S16). Specifically, the candidate determining unit c1 of the first determining unit 2c moves the central part of the superimposing image T in a predetermined direction by a predetermined distance so that the display position of the superimposing image T in the predetermined display image G is displayed. The candidate position is determined. That is, the candidate determination unit c1 determines that the predetermined display image G has the same luminance as the average value of the luminance values of the pixels Ea constituting the outer edge of the superimposition image T, and other non-similar regions. Then, the central portion (center coordinates) of the superimposing image T is moved in a predetermined direction (for example, right direction) from the superimposition reference position, and the central portion of the superimposing image T enters the dissimilar region. This is a candidate position for the display position of the superimposing image T.

Thereafter, the process proceeds to step S13, and the first calculation unit 2a displays the color of the outer edge portion of the superimposition image T and the display position candidate position determined by the candidate determination unit c1 in the predetermined display image G. The degree of similarity between the superimposed image T and the color at the boundary is calculated again (step S13). As described above, for example, as described above, a ratio m / L of the number m of pixels with the same luminance in the total number L of pixels Eb at the boundary is used.
Subsequently, as described above, the determination unit 2b determines whether or not the similarity calculated again by the first calculation unit 2a is greater than or equal to a predetermined value (step S14). Specifically, the determination unit 2b specifies a similar pixel among the similarities calculated by the first calculation unit 2a, that is, the total number L of pixels Eb at the boundary between the predetermined display image G and the superimposition image T. It is determined whether the ratio m / L of the number m of pixels having the same luminance specified by the part a2 is equal to or greater than a predetermined value (for example, 0.2).
Here, if it is determined that the similarity is not greater than or equal to a predetermined value (less than the predetermined value) (step S14; NO), the first determination unit is easy to identify the superimposed image T displayed at the candidate position. 2c determines the candidate position as the display position of the image for superimposition T (step S15), and ends the superimposition position determination process. On the other hand, if it is determined that the similarity is greater than or equal to a predetermined value (not less than the predetermined value) (step S14; YES), it is difficult to identify the superimposition image T displayed at the candidate position. In 2c, after changing the display position of the superimposing image T in the predetermined display image G (step S16), the process proceeds to step S13.

By executing the above processing until it is determined in step S14 that the degree of similarity is not equal to or higher than a predetermined value (less than the predetermined value) (step S14; YES), the superimposing image T in the predetermined display image G is displayed. The display position where it is easy to identify is determined.
As a result, as shown in FIG. 4B, a region having a color different from the color of the superimposing image T in the predetermined display image G, that is, a black clock display image (superimposing image T) is converted into the superimposing image T. Instead of being superimposed and displayed on the dark part similar to the color of the image, it is superimposed on the “lighted-up tower” part different from the color of the superimposition image T and displayed on the display unit 1. In FIG. 4B, the superimposed image T is schematically represented by a wavy line when displayed at the overlapping reference position, that is, before the new display position is determined.

  As described above, according to the image display apparatus 100 of the present embodiment, the superimposition image T (for example, a clock display image) is superimposed on a region of a color different from the color of the superimposition image T in the predetermined display image G. Thus, it is possible to suppress the superimposition image T from being lost in the predetermined display image G and the visibility of the superposition image T from being lowered. For example, when the difference between the luminance value of the pixel constituting the superimposing image T and the luminance value of the pixel in the background region of the superimposing image T superimposed on the predetermined display image G is small, When the color of the image T for superimposition and the color of the background area of the image for superimposition T superimposed on the predetermined display image G are similar colors, the display position of the image T for superimposition in the predetermined display image G The superimposing image T is confused with the background area, and the visibility of the superimposing image T is lowered. However, by displaying the superimposing image T in a region having a color different from the color of the superimposing image T in the predetermined image, the superimposing image T is made to stand out from the background region of the superimposing image T in the predetermined display image G. It is possible to suppress a reduction in the visibility of the superimposing image T in the predetermined display image G.

Specifically, the degree of similarity between the color of the image for superimposition T and the color of the boundary portion between the image for superimposition T superimposed and displayed at a predetermined superposition reference position of the predetermined display image G is calculated. When the similarity is determined to be greater than or equal to a predetermined value, the display position of the superimposing image T is determined in a region having a color different from the color of the superimposing image T in the predetermined display image G. Even when the superimposition reference position of the superimposing image T in the image G is determined in advance, the superimposing image T is superimposed on a region of a color different from the color of the superimposing image T in the predetermined display image G. It is possible to prevent the superimposition image T from being lost in the predetermined display image G and the visibility of the superposition image T from being lowered.
In particular, in a slide show playback display in which a plurality of display images are switched at a predetermined interval and displayed, or in a moving image playback display in which a plurality of image frames are switched at a predetermined playback frame rate, the first display image (the image frame in the moving image) ), Even if the superimposition image T is superimposed and displayed with the position with good visibility of the superimposition image T as the superimposition reference position, in the next display image (image frame), the superimposition reference position in the predetermined display image G is maintained. The color of the displayed superimposition image T becomes similar to the color of the superimposition image T, and the visibility of the superimposition image T may be reduced. However, the slideshow reproduction is performed by sequentially determining the display position of the superimposing image T in an area of a color different from the color of the superimposing image T in a predetermined display image G (image frame) that is actually reproduced and displayed. Even in the case of display or playback display of moving images, it is possible to continuously suppress a decrease in the visibility of the superimposed image T.

Also, the luminance value of each pixel Ea at the edge of the superimposing image T and the luminance value of each pixel Eb at the boundary between the superimposing image T displayed at a predetermined superimposing reference position of the predetermined display image G Therefore, the similarity between the color of the outer edge portion of the superimposing image T and the color of the boundary portion between the superimposing image T displayed superimposed on the predetermined superimposing reference position of the predetermined display image G is calculated. The degree can be calculated appropriately based on the luminance values of the pixels Ea and Eb.
Furthermore, the luminance value of each pixel Ea constituting the outer edge portion of the adjacent superimposing image T among the respective pixels Eb at the boundary with the superimposing image T displayed at the predetermined superimposition reference position of the predetermined display image G Is calculated as the similarity, so that a plurality of pixels Eb at the boundary with the superimposition image T displayed at a predetermined superimposition reference position in the predetermined display image G The degree of similarity can be calculated in consideration of the whole, and a region having a color different from the color of the outer edge portion of the image for superimposition T in the predetermined display image G that is the display position of the image for superimposition T is appropriately specified. be able to.

In addition, the candidate position of the display position of the superimposing image T in the predetermined display image G is determined by moving the central portion of the superimposing image T from the predetermined superimposition reference position in a predetermined direction by a predetermined distance, Since the display position of the image for superimposition T in the predetermined display image G is determined from the candidate positions for the display position of the image T, when the display position of the image for superimposition T is determined, the superposition reference position of the image for superimposition T is determined. , And the display position of the superimposed image T can be prevented from changing greatly. Accordingly, it is possible to reduce a sense of incongruity caused to the user due to a change in the display position of the superimposing image T.
Further, when determining the candidate position of the display position of the superimposing image T, the superimposing image T is placed in a region having a color different from the representative color (for example, the color of the edge) of the superimposing image T in the predetermined display image G. Since the candidate position of the display position of the superimposing image T is determined so that the center portion exists, the processing speed related to the determination of the display position of the superimposing image T can be improved. That is, since the size of the superimposing image T is smaller than the entire predetermined display image G, the central portion of the superimposing image T exists in an area of a color different from the representative color of the superimposing image T in the predetermined display image G. As described above, there is a case where the entire superimposition image T can be disposed in an area of a color different from the representative color of the superimposition image T in the predetermined display image G simply by disposing the superimposition image T. Thereby, it is not necessary to determine again the candidate position of the display position of the superimposing image T, and the display position of the superimposing image T can be quickly determined.

  Further, when the candidate position of the display position of the superimposing image T is determined, the color of the superimposing image T and the color of the boundary portion between the superimposing image T displayed at the candidate position in the predetermined display image G The similarity is calculated, and among the candidate positions of the display position of the superimposition image T, the candidate positions determined to have a similarity not greater than or equal to a predetermined value are different in color from the color of the superimposition image T in the predetermined display image G. Since the display position of the superimposition image T is determined as a region, determination of a region having a color different from the color of the superimposition image T in the predetermined display image G, which is the display position of the superimposition image T, is performed. It is possible to appropriately perform the display position candidate positions.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
Below, the modification of the image display apparatus 100 is demonstrated with reference to FIGS.

<Modification 1>
The image display apparatus 200 according to the first modification example identifies, for each pixel of the predetermined display image G, a pixel that is not similar to the color of the image T for superimposition specified by the central control unit 8, and performs superimposition on the predetermined display image G. The display position of the superimposing image T is determined in a region having the largest area among a plurality of regions continuously formed by a plurality of pixels not similar to the color of the image T.
Note that the image display device 200 according to the first modification has substantially the same configuration as that of the image display device 100 according to the above-described embodiment, and a detailed description thereof will be omitted.

FIG. 6 is a block diagram illustrating a schematic configuration of the image display apparatus 200 according to the first modification.
As illustrated in FIG. 6, the image display device 200 according to the first modification includes the superimposition position determination unit 2 including a second calculation unit 2d, a dissimilar pixel specifying unit 2e, and a second determination unit 2f. .

The second calculation unit 2d includes a pixel value calculation unit a1 similarly to the first calculation unit 2a of the above embodiment.
Similar to the above embodiment, the pixel value calculation unit a1 obtains image data of an image for superimposition T (for example, a clock display image) designated by the central control unit 8 based on a predetermined operation of the operation input unit 7 by the user. The luminance value of each pixel constituting the superposition image T is calculated based on the image data acquired from the superposition image recording unit 6.
Further, the pixel value calculation unit a1 acquires image data of a predetermined display image G designated by the central control unit 8 based on a predetermined operation of the operation input unit 7 by the user from the display image recording unit 5, and the image data Based on the above, the luminance value of each pixel of the predetermined display image G is calculated.

The dissimilar pixel specifying unit 2e specifies a pixel that is not similar to the color of the superimposition image T for each pixel of the predetermined image.
That is, the dissimilar pixel specifying unit 2e specifies, for each pixel of the predetermined display image G, a pixel having a luminance value that is not similar to the luminance value of the pixel Ea that forms the outer edge portion of the superimposition image T. Specifically, the dissimilar pixel specifying unit 2e calculates an average value based on, for example, the luminance value of each pixel constituting the outer edge portion of the superimposing image T calculated by the pixel value calculating unit a1. The dissimilar pixel specifying unit 2e compares, for example, the luminance value of each pixel of the predetermined display image G with the average value of the luminance values of the pixels Ea constituting the outer edge portion of the superimposing image T. Subsequently, the dissimilar pixel specifying unit 2e determines a pixel having a luminance value different from the average value from the pixels of the predetermined display image G as a pixel having a different luminance, that is, the superimposing image T. It is specified as a pixel dissimilar to the color. On the other hand, the dissimilar pixel specifying unit 2e selects a pixel having a luminance value difference with respect to the average value within a predetermined range among the pixels of the predetermined display image G. Are identified as similar pixels.

Note that, for example, the luminance value is used to specify a pixel that is not similar to the color of the outer edge portion of the superimposition image T in the predetermined display image G. However, this is an example, and the present invention is not limited to this. As long as the similarity (difference) with the color of the outer edge portion of the image T can be calculated quantitatively, it can be arbitrarily changed. For specifying the color of the superimposing image T, instead of the luminance value of each pixel at the outer edge of the superimposing image T, the average value of the luminance values of the pixels constituting the superimposing image T may be used. good.
Here, the dissimilar pixel specifying unit 2e constitutes a specifying unit that specifies, for each pixel of a predetermined image, a pixel that is not similar to the color of the superimposing image T specified by the central control unit 8.

The second determining unit 2f determines the display position of the superimposing image T in a continuous area having the maximum area continuously formed by a plurality of pixels that are not similar to the color of the superimposing image T in the predetermined display image G. To do.
That is, the second determination unit 2f determines the outer edge portion of the superimposing image T based on the result of specifying pixels that are not similar to the color of the outer edge portion of the superimposing image T in the predetermined display image G by the dissimilar pixel specifying unit 2e. A plurality of continuous regions R1 formed by arranging a plurality of pixels dissimilar to colors adjacent to each other are specified. Then, the second determination unit 2f determines a predetermined position of the continuous region R1max having the largest area as the display position of the superimposed image T among the plurality of specified continuous regions R1. For example, as shown in FIG. 8A, when an image of a night view is illustrated as the predetermined display image G, the “moon” and “lighted tower” portions are high in luminance, so that the black superimposition is performed. A continuous region R1 formed of pixels dissimilar to the color of the image T for use and formed by the pixels is schematically represented as a region R1 without dots (outlined). On the other hand, dark portions other than “moon” and “lighted-up tower” are low in luminance, and thus consist of pixels similar to the color of the black superimposing image T, and a continuous region R2 formed by the pixels. Is schematically represented as a region R2 with dots.
Both the “moon” and the “lighted-up tower” are specified as a region R1 composed of pixels dissimilar to the color of the superimposing image T. Since the “tower” region R1 has the maximum area, the region R1 becomes the continuous region R1max having the maximum area.
Here, when the continuous area R1max having the maximum area is larger than the size of the image T for superimposition, the second determination unit 2f starts from the center of the display image within the continuous area R1max having the maximum area. You may make it determine the display position of the image T for superimposition so that it may leave | separate as much as possible. Further, the second determination unit 2f performs feature detection processing for detecting a feature region (for example, a human face) of the main subject from the display image, and performs superimposition so as to be as far as possible from the feature region of the main subject. The display position of the image T may be determined.
As the feature detection process, for example, a face detection process, an edge detection process, or the like is used. Since these processes are well-known techniques, detailed description thereof is omitted here.

In addition, the second determination unit 2f specifies a plurality of continuous regions formed continuously by a plurality of pixels that are not similar to the color of the superimposition image T in the predetermined display image G. There is no need to specify a plurality, and it is sufficient to specify at least one.
As described above, the second determining unit 2f is continuously formed by a plurality of pixels that are not similar to the color of the superimposing image T in the predetermined display image G specified by the dissimilar pixel specifying unit 2e as the determining unit. The display position of the superimposing image T is determined in the region R1max having the maximum area among at least one of the plurality of regions R1.

Next, the superposition position determination process will be described with reference to FIG.
FIG. 7 is a flowchart illustrating an example of an operation related to the overlapping position determination process in the image display process.
Note that the image display processing by the image display device 200 of Modification 1 is substantially the same as the image display processing in the image display device 100 of the above-described embodiment except for the superposition position determination processing described below, and the detailed description thereof. Is omitted.

As illustrated in FIG. 7, first, the pixel value calculation unit a1 of the second calculation unit 2d performs the superimposition image T (designated in step S2 of the image display process, similarly to the superposition position determination process of the above embodiment. For example, image data such as a clock display image is acquired from the superimposition image recording unit 6, and the luminance value of each pixel Ea constituting the outer edge portion of the superimposition image T is calculated based on the image data (step S11). .
Subsequently, the pixel value calculation unit a1 acquires the image data of the predetermined display image G designated in step S1 of the image display process from the display image recording unit 5, and based on the image data, the predetermined display image G The luminance value of each pixel is calculated (step S32).

Next, the dissimilar pixel specifying unit 2e specifies, for each pixel of the predetermined display image G, a pixel having a luminance value that is not similar to the luminance value of the pixel Ea that forms the outer edge portion of the superimposition image T (step S33). ).
Specifically, the dissimilar pixel specifying unit 2e calculates, for example, an average value of the luminance values of the pixels constituting the outer edge portion of the superimposing image T, and the luminance value of each pixel of the predetermined display image G is calculated. And the average value of the luminance values of the pixels Ea constituting the outer edge portion of the superimposing image T are compared. Then, the dissimilar pixel specifying unit 2e specifies a pixel whose luminance value difference is outside the predetermined range as a pixel dissimilar to the color of the outer edge portion of the superimposition image T. A pixel having a luminance value difference within a predetermined range is specified as a pixel similar to the color of the outer edge of the superimposition image T.

Subsequently, the second determination unit 2f determines the outer edge portion of the superimposing image T based on the result of specifying pixels that are not similar to the color of the outer edge portion of the superimposing image T in the predetermined display image G by the dissimilar pixel specifying unit 2e. A plurality of continuous regions R1 that are continuously formed by a plurality of pixels dissimilar to the color of is specified (step S34). Then, the second determining unit 2f determines a predetermined position of the continuous region R1max having the largest area as the display position of the superimposed image T among the plurality of identified continuous regions R1 (Step S35). The superposition position determination process ends.
As a result, as shown in FIG. 8B, the maximum of the continuous region R1 formed continuously by a plurality of pixels dissimilar to the color of the outer edge portion of the image for superimposition T in the predetermined display image G. The superimposing image T is superimposed on the region R1max (for example, the region R1 of the “lighted-up tower” portion) and is displayed on the display unit 1.

  Therefore, according to the image display device 200 of the first modification, the largest area among the plurality of continuous regions R1 continuously formed by a plurality of pixels that are not similar to the color of the superimposition image T in the predetermined display image G. Since the display position of the superimposing image T is determined in the continuous region R1 having the same as in the above embodiment, the superimposing image T is confused with the predetermined display image G, and the visibility of the superimposing image T is reduced. It is possible not only to suppress this, but also to improve the processing speed related to the determination of the display position of the superimposition image T. That is, only by specifying the continuous area R1max having the maximum area from among the plurality of continuous areas R1 continuously formed by a plurality of pixels that are not similar to the color of the superimposed image T in the predetermined display image G, The continuous region R1 can be determined as the display position of the superimposing image T, and the display position of the superimposing image T can be quickly determined.

  In the embodiment and the first modification, the outer edge portion is mainly exemplified as the edge portion of the superimposing image T. However, when the overlapping image T has an inner edge portion, a predetermined display image is displayed. A region of a color different from the color of the superimposing image T and the outer edge portion in G and a region of a color different from the color of the superimposing image T and the inner edge portion are specified, and the display position of the superimposing image T is set in the region. Alternatively, a region having a color different only from the superimposing image T and the inner edge color in the predetermined display image G may be specified, and the display position of the superimposing image T may be determined in the region. May be.

  Furthermore, in the above embodiment and Modification 1, when switching the display image in the slide show playback display, for example, a switching effect such as fade-in, fade-out, and wipe may be executed. The execution mode of the switching effect may be changed with the display position of the superimposed image T as a reference. That is, for example, the execution of the switching effect is started from the display position side of the superimposing image T in the currently displayed display image, or the display position side of the superimposing image T in the display image scheduled to be displayed next is the switching effect. The execution mode of the switching effect may be changed so as to be the last of the above. As a result, it is possible to secure a sufficient time for determining the display position of the superimposing image T, and to reduce a sense of incongruity caused to the user even when the display position of the superimposing image T changes.

  In the embodiment and the first modification, the superimposing image T and the display image are recorded inside the image display device 100 (200). These images may be recorded in the recording means, and these images may be acquired from the recording means via a predetermined communication cable or communication line and displayed.

  Furthermore, in the embodiment and the first modification, the luminance value is exemplified as the pixel value, but the present invention is not limited to this, and any value that can be expressed quantitatively based on the RGB value of each pixel. Anything may be used.

In addition, in the above-described embodiment, the function as the determination unit is realized by driving the first determination unit 2c (second determination unit 2f) of the superimposition position determination unit 2. However, the present invention is not limited to this, and a configuration realized by executing a predetermined program or the like by the CPU of the central control unit 8 may be adopted.
That is, a program including a determination processing routine is stored in a program memory (not shown) that stores the program. Then, the CPU of the central control unit 8 in a predetermined image displayed on the display screen of the display unit 1 has a color different from the color of the superimposition image T displayed superimposed on the predetermined image by the determination processing routine. You may make it function as a determination means which determines the display position of the image T for superimposition in an area | region.

  Similarly, the calculation means, determination means, candidate determination means, and identification means may be realized by a predetermined program executed by the CPU of the central control unit 8.

  Furthermore, as a computer-readable medium storing a program for executing each of the above processes, a non-volatile memory such as a flash memory or a portable recording medium such as a CD-ROM is applied in addition to a ROM or a hard disk. Is also possible. A carrier wave is also used as a medium for providing program data via a predetermined communication line.

100, 200 Image display device 1 Display unit 2 Superposition position determination unit 2a First calculation unit 2b Determination unit 2c First determination unit 2d Second calculation unit 2e Dissimilar pixel specification unit 2f Second determination unit 7 Operation input unit 8 Central control Part

Claims (12)

Display means for displaying a predetermined image on the display screen;
Determining means for determining a display position of the superimposing image in an area of a color different from a color of the superimposing image displayed superimposed on the predetermined image in the predetermined image displayed on the display screen;
An image display device comprising: Calculating means for calculating the similarity between the color of the image for superimposition and the color of the boundary between the image for superimposition displayed superimposed on a predetermined reference position of the predetermined image;
Determination means for determining whether or not the similarity calculated by the calculation means is equal to or greater than a predetermined value;
The determining means further includes
Determining the display position of the superimposition image in an area of a color different from the color of the superimposition image in the predetermined image when the determination unit determines that the similarity is equal to or greater than a predetermined value. The image display device according to claim 1, wherein The determining means includes
When the determination means determines that the similarity is greater than or equal to a predetermined value, the central portion of the image for superimposition is moved from the predetermined reference position in a predetermined direction by a predetermined distance in the predetermined image. Candidate determination means for determining a candidate position of the display position of the image for superimposition,
3. The image display according to claim 2, wherein a display position of the superimposition image in the predetermined image is determined from candidate positions of the display position of the superimposition image determined by the candidate determination unit. apparatus. The candidate determining means includes
The candidate position of the display position of the image for superimposition is determined so that the central portion of the image for superimposition exists in an area of a color different from the representative color of the image for superimposition in the predetermined image. 4. The image display device according to 3.   The image display device according to claim 4, wherein a representative color of the superimposing image includes a color of an edge of the superimposing image. The calculating means further includes:
Calculating the degree of similarity between the color of the image for superimposition and the color of the boundary between the image for superimposition displayed at the candidate position of the display position determined by the candidate determination means in the predetermined image;
The determination means further includes:
Determining whether the similarity calculated by the calculating means is equal to or greater than a predetermined value;
The determining means further includes
Among the candidate positions of the display position of the superimposing image determined by the candidate determining means, candidate positions determined by the determining means that the similarity is not greater than or equal to a predetermined value are selected as the superimposing image in the predetermined image. The image display apparatus according to claim 3, wherein the display position of the image for superimposition is determined as an area having a color different from the color of the image. The calculating means includes
The similarity between the pixel value of each pixel at the edge of the image for superimposition and the pixel value of each pixel at the boundary between the image for superimposition displayed at the predetermined reference position of the predetermined image is calculated. ,
The determining means includes
When the determination unit determines that the similarity is greater than or equal to a predetermined value, the display position of the image for superimposition is set in a region having a pixel value different from the pixel at the edge of the image for superimposition in the predetermined image. The image display device according to claim 2, wherein the image display device is determined. The calculating means includes
Among the pixels at the boundary between the predetermined image and the superimposing image displayed at the predetermined reference position, the pixel value is similar to the pixel value of each pixel at the edge of the adjacent superimposing image. The image display device according to claim 7, wherein a pixel ratio is calculated as the similarity. For each pixel of the predetermined image, further comprising a specifying means for specifying a pixel that is not similar to the color of the image for superimposition;
The determining means further includes
The display position of the superimposing image is determined in a region having the largest area among at least one region continuously formed by a plurality of pixels not similar to the color of the superimposing image specified by the specifying unit. The image display device according to claim 1.   The image display apparatus according to claim 1, wherein the superimposing image is a clock display image that displays a current time. An image display method using an image display device comprising a display means for displaying a predetermined image on a display screen,
Processing for determining a display position of the superimposing image in a region of a color different from the color of the superimposing image displayed superimposed on the predetermined image in the predetermined image displayed on the display screen;
The image display method characterized by performing. A computer of an image display device comprising display means for displaying a predetermined image on a display screen,
Determining means for determining a display position of the superimposing image in an area of a color different from a color of the superimposing image displayed superimposed on the predetermined image in the predetermined image displayed on the display screen;
A program characterized by functioning as

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