JP4515103B2 - Image display method, image advertising method - Google Patents

Description

  The present invention relates to an image display method using image display pixels and an advertisement method using an image, and more particularly to an image display method and an image advertisement method in which non-display and display are switched according to special conditions.

  Some types of image display devices do this by changing the light emission duty ratio digitally because it is difficult to control analog light emission intensity for halftone display. A typical example is a plasma display panel (PDP), and an organic EL (electroluminescent) display device includes this type. When a halftone is displayed by changing the light emission duty ratio digitally, it is known that image quality deterioration called false contour is generated, and a general image display apparatus has a problem of how to prevent this.

The false contour is recognized by the naked eye when halftone pixels with greatly different emission phases happen to be adjacent to each other and the adjacent portions move at a predetermined speed. This can be considered that the inversion of the emission phase is converted into a spatial movement. The mechanism of the generation of such false contours is described in Non-Patent Document 1, for example.
“PDP high image quality technology”, magazine FUJITSU, Fujitsu Limited, May 1998, Vol. 54, No. 6, p. 210

  The generation of the false contour is only one of the image quality degradations that should be avoided in a general image display apparatus. However, if it is generated in an intentionally controlled form, it should be a useful image display method or advertising method.

  The present invention has been made in view of the above circumstances, and in an image display method using an image display pixel and an advertisement method using an image, by using a false contour and displaying a predetermined display object in a controlled manner. It is an object of the present invention to provide an image display method for displaying an image and an advertisement method using an image.

In order to solve the above problems, an image display method according to the present invention collects pixels that flicker at a frequency at which flicker is not perceived by the naked eye and has a light emission duty ratio, and displays them in halftone. The light emission phase of the pixel set corresponding to the display target among the halftone displayed pixel sets is different from the light emission phase of the remaining pixel sets, and the display position by the pixel set having the different light emission phases is determined. It is characterized in that it is switched and moved in order at a predetermined speed within the set of pixels displayed in halftone.

  With such a configuration, more typically, “a certain light emission duty ratio” is set to “almost light emission duty ratio”, and “different from the light emission phase” is “inverted from the light emission phase”, respectively. be able to. In this typical case, a false contour may occur at the boundary between the inversion and non-inversion of the emission phase. Here, the generation of false contours is opposite between the boundary where the pixel of the inverted phase is replaced by the pixel of the non-inverted phase and the boundary where the pixel of the non-inverted phase is replaced by the pixel of the inverted phase. Become. One is a false contour with a luminance corresponding to a blinking “point”, and the other is a false contour with a luminance corresponding to “blink”. For example, when the pixel set displayed in halftone is switched and moved at a predetermined speed so as to move the object to be displayed from the lower left to the upper right, the upper outline and the right outline of the object to be displayed become the same luminance outline, The lower contour and the left contour are opposite contours having the same luminance. The object to be displayed by these contours appears in the halftone display. Therefore, a predetermined display target can be displayed in a controlled manner using a false contour. When “a certain light emission duty ratio” and “different from the light emission phase” are employed (more general case), the generation of the pseudo contour is not as sharp as the above typical case. However, the action / effect still exists. The difference in configuration between the typical case and the general case is the same in the following.

In another image display method according to the present invention, pixels that blink at a frequency at which flicker is not perceived by the naked eye and that have a light emission duty ratio are gathered and displayed in halftone, and the halftone is displayed. The light emission phase of the pixel set corresponding to the display target among the displayed pixel sets is different from the light emission phase of the remaining pixel sets, and the whole halftone displayed pixel set is based on the viewpoint of the naked eye. It is characterized by relatively moving .

  In this method, an operation of “switching and moving the pixel set having different light emission phases within the pixel set displayed in halftone” is not performed. This assumes a case where the image display surface itself moves within the field of view at a predetermined speed, or conversely, a case where the field of view moves relative to the image display surface at a predetermined speed. In the case of these movements, the naked eye recognizes the false contour by the relative movement with the field of view even if the inverted pixel set is not switched and moved within the halftone-displayed pixel set. Therefore, a predetermined display target can be displayed in a controlled manner using a false contour.

  Note that the blinking may be blinking for any one or two colors for displaying a color image. The most obvious mode of blinking is white as “dot” and black as “disappear”, and their halftone is gray. This is a mode in which all three of R (red), G (green), and B (blue) blink simultaneously as “dots” and “disappear” when viewed in colors for displaying a color image. Therefore, for example, if only R is blinking as one color, when G and B are not lit, “dot” is red, “disappear” is black, and halftone is red near black. When only R is blinking and both G and B are lit, “dot” is white, “absent” is cyan, and halftone is cyan that approaches white.

  Similarly, for example, if R and G are blinked in the same phase as blinking of two colors and B is not lit, “dot” is yellow, “disappear” is black, and halftone is yellow near black. When B is lit with the same phase blinking of R and G, “dot” is white, “disappear” is blue, and halftone is blue near white. Further, for example, when R blinks, G blinks in the opposite phase to R, and B is not lit, one is red, the other is green, and the halftone is yellow with low brightness. Similarly, various other cases also correspond to halftones and “dots” and “disappear” by combining blinking for any one or two colors and combining the phase and lighting or extinguishing of other colors. A false contour color can be selected. Of course, it is also possible to select a halftone and a false contour color by combining the blinking of three colors and their phases.

  The above description of the image display method is the same for the advertisement method using images according to the present invention.

  According to the present invention, it is possible to provide an image display method and an image advertising method that display a predetermined display object in a controlled manner using a false contour.

  Based on the above, embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams for explaining the principle of an image display method according to an embodiment of the present invention. In FIG. 1, reference numeral 10 denotes an image display device in which predetermined pixels are arranged in a matrix. An image display device 10 capable of so-called time-division luminance display is prepared. For example, a PDP or an organic EL display device.

  The display area of the image display device 10 includes a display area 11 and a display area 12 (in this example, a rectangle), and this area 12 moves to the upper right at a predetermined speed as shown in the figure. Suppose you are. The image display device 10 does not have to support color display. However, if the image display device 10 supports color display, pixels of each color (for example, R, G, It is assumed that the pixels B) are turned on or off all at once.

  Each frame of the ground region 11 is configured to emit light (lighted: white) in 1/120 seconds of the first half in one frame (1/60 seconds), and to emit no light (light off: black) in 1/120 seconds of the second half. It is assumed that it is displayed. The ground region 11 is displayed at such intermediate brightness (gray) at such blinking (60 Hz) every 1/120 seconds, and blinking (flicker) cannot be detected with the naked eye. It is known that flicker is detected at a frequency lower than 40 to 50 Hz although it depends on display luminance and ambient brightness. In other words, the ground region 11 is displayed in halftone by collecting pixels that blink at a frequency at which flicker is not felt and whose blinking has a light emission duty ratio of approximately one half.

  With respect to the ground area 11, each pixel of the target area 12 emits light at 1/120 seconds in the first half and emits light at 1/120 seconds in the second half (that is, the light emission phase is opposite to that of the ground area 11). B) Each frame shall be composed and displayed. The target area 12 is also displayed in the middle luminance (gray) with such blinking every 1/120 seconds, and blinking cannot be detected with the naked eye. Therefore, the target area 12 is also displayed in halftone by collecting pixels that blink at a frequency at which flicker is not felt and whose blinking has a light emission duty ratio of approximately one half. From the above, it is conceivable that both the ground area 11 and the target area 12 are displayed in the same gray color and are not displayed on the display device 10 (the target area 12 cannot be seen).

  FIG. 2 is a diagram for explaining the change over time and the appearance of the pixels in the vicinity 13, 14, 15, 16 near the boundary between the target region 12 and the ground region 11 in FIG. First, FIG. 2A shows pixels in the vertical direction in the vertical direction near the boundary 13 or in the horizontal direction in the vicinity 14 of the boundary, and time in the horizontal direction. As described above, the area 11 is controlled in the order of lighting (plain color in the figure) and extinguishing (dot pattern in the figure) in one frame, and the area 12 is controlled in the order of extinguishing and lighting in one frame. As the target area 12 moves, the boundary between the ground area 11 and the target area 12 changes by one pixel as illustrated in each frame.

  At this time, the naked eye always detects that there is no light emission only where “black” is indicated in the figure. This is because in this position, the intra-frame periods without light emission overlap in the time direction. Naturally, both sides of the detection of “black” are gray detection with the display luminance as it is. Therefore, the boundary between the ground region 11 and the target region 12 appears as a black display in gray.

  On the other hand, FIG. 2B shows time in the horizontal direction, indicating pixels in the vertical direction in the vertical direction near the boundary 15 or in the horizontal direction in the vicinity 16 of the boundary. In this case, when the target area 12 moves, it is detected that the naked eye always emits light only at the place marked “white” in the figure. This is because, in this position, the intra-frame periods during which light is emitted overlap in the time direction. Naturally, both sides of the detection of “white” are detection of gray without changing the display luminance. Therefore, the boundary between the ground region 11 and the target region 12 appears as a gray display as white.

  In summary, when the target area 12 moves to the upper right, a black outline is formed on the upper side and the right side, and a white outline is formed on the lower side and the left side, so that the target area 12 is visible (displayed). ) As can be seen from the above description, when the moving direction of the target region 12 is opposite, or when the lighting phase of each pixel is completely opposite, the luminance that appears as an outline is the opposite of the above description. Also, if the movement of the target region 12 is completely up and down, the contours of the left and right sides that match the moving direction do not appear. If the movement is completely left and right, the contours of the upper and lower sides that match the moving direction are It does not appear.

  In the above, for the sake of simplicity, the case of monochrome display has been described. However, when the image display apparatus 10 supports color display, the color of halftone display and the color displayed as the outline of the target area 12 are the respective colors. Various selections can be made by controlling blinking and its phase, or lighting / extinguishing of color pixels. This has already been explained. In other words, the halftone between the first half color display and the second half color display constituting one frame (this “halftone” includes a halftone by mixed colors in addition to black and white). The area to be removed is displayed, and the outline is either the first half color display or the second half color display.

  Further, in the above description, the target area 12 is moved at a predetermined speed (a movement corresponding to one pixel for each frame), but even when there is no movement of the target area 12 on the image display device 10, The target area 12 is recognized depending on the viewing state. That is, the viewpoint with the naked eye moves relative to the image display device 10 at the speed described above. In this case, the principle that the contour of the target region 12 is generated can be explained in the same manner as described above. In order to move the viewpoint relative to the image display device 10 at the speed described above, the image display device 10 itself is moved, the viewpoint is moved, or both. Can be applied.

  For example, a case where the image display apparatus 10 itself is considered to move is when the image display apparatus 10 is disposed on the side surface of a moving body such as a vehicle. In this case, since the display surface of the image display apparatus 10 moves in the field of view, the outline of the target region 12 is detected with the naked eye when the moving speed is equivalent to the predetermined speed. In this way, it is almost always unfavorable for normal image display that it becomes easier to see depending on the visual state, but there is a certain effect when considered as an advertising medium It is considered useful.

  On the other hand, in order to move the viewpoint, for example, a case where the image display device 10 is fixedly disposed at a position that is easy to see from the vehicle window can be considered. Also in this case, since the display surface of the image display device 10 moves in the field of view, the outline of the target region 12 is detected with the naked eye when the moving speed is equivalent to the predetermined speed. . After all, when the display is considered as an advertising medium, it is considered that there is a certain effect.

  In addition, in addition, in the above description (explanation of moving the target area 12 at a predetermined speed on the image display device 10), the movement is described as being equivalent to one pixel for each frame. Since the naked eye detects the contour when the movement of 12 reaches a predetermined relative speed in the field of view, the movement speed of the target region 12 on the image display device 10 need not be limited to the above case. Various movements may be performed by combining the movement of the image display device 10 itself and the movement of the viewpoint.

  Further, in the above description, the case where the light emission duty ratio is approximately ½ and the light emission phase is inverted between the ground area and the target area has been described. Even if it is adopted and only the light emission phase is changed between the ground area and the target area so as to realize this light emission duty ratio, there is an effect of generating a pseudo contour. This is obvious if a diagram like FIG. 2 is written corresponding to the case.

  Furthermore, in the above description, the case where an intentional pseudo contour is generated is described. Of course, a display portion which does not cause an intentional pseudo contour in the same display device is used as a normal display device. be able to.

  FIG. 3 is a diagram for explaining an image display method according to another embodiment of the present invention. In this embodiment, as shown in the figure, the image display device 10 described above is used to provide a more realistic target area 12 in the ground area 11 for display. As the movement of the target region 12, various movements such as a deformed circular motion as shown in FIG. 3B and a triangular wave shape as shown in FIG. Alternatively, the target region 12 may be moved with rotation in addition to translation as shown in the figure. Furthermore, the shape of the target region 12 may not be constant over time. For example, a temporal shape change (so-called morphing) like an amoeba is also conceivable.

  The present invention can be used, for example, as a method for advertising media on the street or as an image display method for a screen saver on a personal computer screen, for example. The advertising industry is an industry, and personal computers are used in a wide variety of industries, and thus have industrial applicability.

The figure for demonstrating the principle of the image display method which concerns on one Embodiment of this invention. FIG. 2 is a continuation diagram of FIG. 1 for explaining the principle of an image display method according to an embodiment of the present invention. The figure for demonstrating the image display method which concerns on another embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Image display apparatus, 11 ... Ground area, 12 ... Object area | region, 13, 14, 15, 16 ... Near boundary.

Claims (6)

A pixel that blinks at a frequency at which flicker is not perceived by the naked eye, and that has a light emission duty ratio with the blinking, is displayed in halftone,
The light emission phase of the pixel set corresponding to the display target of the halftone displayed pixel set is different from the light emission phase of the remaining pixel sets,
An image display method, wherein the display position of the pixel set having different light emission phases is sequentially switched and moved at a predetermined speed in the halftone-displayed pixel set. A pixel that blinks at a frequency at which flicker is not perceived by the naked eye, and that has a light emission duty ratio with the blinking, is displayed in halftone,
The light emission phase of the pixel set corresponding to the display target of the halftone displayed pixel set is different from the light emission phase of the remaining pixel sets,
An image display method, wherein the whole pixel group displayed in halftone is relatively moved with reference to the viewpoint of the naked eye. 3. The image display method according to claim 1, wherein the blinking is blinking for any one or two colors for displaying a color image. A pixel that blinks at a frequency at which flicker is not perceived by the naked eye, and that has a light emission duty ratio with the blinking, is displayed in halftone,
The light emission phase of the pixel set corresponding to the display target of the halftone displayed pixel set is different from the light emission phase of the remaining pixel sets,
An advertising method using an image, wherein the display position of the pixel set having different emission phases is sequentially switched and moved at a predetermined speed within the halftone-displayed pixel set. A pixel that blinks at a frequency at which flicker is not perceived by the naked eye, and that has a light emission duty ratio with the blinking, is displayed in halftone,
The light emission phase of the pixel set corresponding to the display target of the halftone displayed pixel set is different from the light emission phase of the remaining pixel sets,
An advertising method using an image, wherein the whole pixel group displayed in halftone is moved relative to the viewpoint of the naked eye.   6. The image advertising method according to claim 4, wherein the blinking is blinking for any one or two colors for displaying a color image.

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