JP2005115011A - Image display apparatus, image display method, image display program and recording medium recording the program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display more smooth image with high resolution by dynamically switching display data by changing a pixel unit of a display image. <P>SOLUTION: An image display apparatus 1 is equipped with; a processing image storage means 11 for storing a processing image; a reduced image forming means 12 for forming a plurality of reduced images of the same resolution by thinning out pixels from the processing image stored in the processing image storage means; a reduced image output means 13 for sequentially selecting the plurality of reduced images according to a common reference coordinate position of the respective reduced images and outputting the selected images to a display; an image display means 14; and an operation means 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an image display apparatus, an image display method, an image display program, and an image display program that dynamically switch display data by changing a pixel unit of a display image, thereby enabling a smoother and higher resolution display. The present invention relates to a recorded recording medium.

  In the case of displaying a digital image on a display, when an image on a memory is displayed on a display device, pixels are partially sampled in accordance with the resolution of the display device. Therefore, when the number of vertical and horizontal pixels of the display is smaller than the number of vertical and horizontal pixels of the original image, a reduced image is displayed on the display. Therefore, the visibility of the displayed image deteriorates. In order to compensate for this, a specific partial region that is considered important is partially enlarged (not reduced).

Also, when displaying an image on a display such as a mobile phone or PDA, or when displaying an image in a region where the display area is limited (for example, when a plurality of images must be displayed in a display area of a predetermined area) ) In order to display the entire image, the reduced overall image is often displayed as a thumbnail. However, when the original image is simply reduced and displayed, the image is often crushed and displayed, or the thin line disappears and the journal cannot be recognized (or is not easy). For this reason, in this thumbnail display method, as shown in Patent Document 1, for example, the document image is displayed as it is after being thinned, or displayed as it is or averaged with surrounding pixels.
JP-A-10-178541

  However, in the method of partially enlarging and displaying the specific partial area described above, this display becomes difficult to use when the specific part is selected unintentionally. A technique of arranging a so-called “soft magnifier” at a desired position is also known, but there is a problem that it is difficult to grasp the entire image. In addition, this thumbnail display method is selected according to the characteristics of the original image, and there is a problem that only an effect of slightly improving visibility can be expected.

  The present invention relates to an image display apparatus, an image display method, an image display program, and an image display program that dynamically switch display data by changing a pixel unit of a display image, thereby enabling a smoother and higher resolution display. It is an object to provide a recorded recording medium.

  The image display device of the present invention includes a processing target image storage unit that stores a processing target image, and a plurality of types of reduced images having the same resolution by thinning out pixels from the processing target image stored in the processing target image storage unit. Reduced image creation means to be generated, and reduced image output means for sequentially selecting the plurality of reduced images according to the position of the common reference coordinate of each reduced image and outputting them to a display. In this image display device, the position of the common reference coordinates of the reduced image can be changed by a user operation.

  The image display device of the present invention includes a processing target image storage unit that stores a processing target image, and a plurality of types of reduced images having the same resolution by thinning out pixels from the processing target image stored in the processing target image storage unit. It is also characterized by comprising reduced image creating means to be generated and reduced image output means for automatically selecting the plurality of reduced images sequentially in accordance with time changes and outputting them to a display. In this image display device, the reduced image output means can circulate and output the reduced image to the display with a time change that cannot be recognized individually but can be recognized continuously.

In the image display device of the present invention, the plurality of types of reduced images include, as parameters, display luminance, display density, or display color of pixels as attributes.
The image display device of the present invention can also change the display size depending on the display position of the reduced screen. In the image display device of the present invention, the reduced image output means 13 can have a function of selecting and outputting to the display in a fixed manner according to the position of the common reference coordinates of a single reduced image. In the image display device of the present invention, when the reduction ratio of the reduced image is not a fraction of an integer, the phase of the pixels constituting the original image can be dynamically changed.

  The image display method according to the present invention includes a reduced image creating step for generating a plurality of types of reduced images having the same resolution by thinning out pixels from a processing target image, and the plurality of reduced images are converted into common reference coordinates of the reduced images. And a reduced image output step of sequentially selecting and outputting to the display according to the position of the image.

  The image display method of the present invention includes a reduced image creating step for generating a plurality of types of reduced images having the same resolution by thinning out pixels from the processing target image stored in the processing target image storage unit, and the plurality of reductions. A reduced image output step of automatically selecting and sequentially outputting images to the display according to a change in time.

  In the image display method of the present invention, in the reduced image output step, the user cannot recognize the reduced images individually but can circulate and output them to the display with a time change that can be recognized continuously.

  The image display program of the present invention includes a program for executing the angular step, and the program is recorded on a computer-readable recording medium of the present invention.

  By changing the pixel unit of the display image, the display data can be dynamically switched to enable a smoother and higher resolution display.

  Embodiments of the present invention will be described below. Here, the case where the original image OG is displayed in a reduced size because the image stored in the memory is larger than the image display area will be described.

  FIG. 1 is a block diagram showing an image processing apparatus of the present invention. In FIG. 1, the image processing apparatus 1 includes a processing target image storage unit 11, a reduced image creation unit 12, an image information output unit 13, an image display unit 14, and an operation unit 15.

  The processing target image storage unit 11 is typically a memory and stores a processing target image (original image OG which is digital information), and the reduced image creation unit 12 stores the original image OG from the processing target image storage unit 11. And a predetermined reduction process (decimation process or resolution reduction process) can be performed. By this reduction processing, a plurality of types of reduced images having the same resolution are created.

  Generally, when the original image OG stored in the processing target image storage unit 11 is converted into an image having a resolution lower than the original image OG resolution, the reduced image creating unit 12 converts the original image OG in units of pixels. Divide the space.

  FIG. 2A shows a state in which the original image OG is divided and displayed on the vertical grid, and FIGS. 2B1, 2B2, and 3B show that the horizontal axis direction of the original image OG is 1. An image displayed by being reduced to / 3 is shown. In other words, in this example, the reduced image cg is created by reducing three columns of pixels to one column. The reduced image cg is assumed to be one of the three types shown in FIGS. 2B1, 2 </ b> B <b> 2, and 3 </ b> B 3 according to the phase (3 phases) of data extraction of the original image OG.

  In the prior art, when the image is reduced to 1/3 along the horizontal axis, as shown in FIGS. 3A, 3B, 3C, and 3D, the reduced image cg is located anywhere. In addition, any one of the three types of figures in FIG. 2 (B1), (B2), and (B3) is fixedly displayed. In FIGS. 3A, 3B, 3C, and 3D, the position of the reduced image cg is represented by s. That is, conventionally, the same image is displayed uniformly regardless of the position of the reduced image cg. Even when the reduced image cg is moved (dragged) by a pointing device such as a mouse, the display pattern does not change (this pattern is indicated by P).

  On the other hand, in the present embodiment, the reduced image of the original image OG is dynamically changed. That is, the pixel group extracted from the original image OG is dynamically changed according to the cutout position (in accordance with the phase to be extracted).

  In the first example, when the original image OG is reduced to 1/3, for example, when the reduced image is dragged with a pointing device, the display pattern of the reduced image cg is one pixel (for three pixels of the original image OG). Each time it is moved (as shown in FIGS. 4A, 4B, 4C, and 4D), it dynamically changes sequentially as P0, P1, P2, and P3 (the same pattern as P0).

  In the second example, the display pattern of the reduced image cg automatically and sequentially changes like P0, P1, P2, and P3 (the same pattern as P0) dynamically without any operation by the pointing device. The extraction phase of the original image OG is reduced and displayed while being changed in steps in a predetermined unit time. In this way, the user can recognize the time averaged image and observe a reduced image with an improved apparent resolution.

  The sampling range of the original image at this time is arbitrary, and the display position is shifted continuously by repeating the cycles of P0, P1, and P2, while repeating the cycles of P0, P1, and P2, and continuously. It is also possible to display dynamically.

  As can be seen from the first and second examples, as shown in FIGS. 4 (A), (B), (C), and (D), visibility is achieved by dynamic display of a plurality of images with a single pattern P. Is significantly improved.

  5A, 5B, and 5C are explanatory diagrams when the original image OG is thinned out in the horizontal direction and the vertical direction. FIG. 5A shows the original image OG, and FIGS. 5B and 5C show the sampling start position of the original image OG at point a when the original image OG is displayed by being halved. And reduced images cg (display patterns P0, P1) when point b is used.

  The display algorithm for the case where the reduced image cg is 1 / integer will be described below. It is assumed that the pixel of the original image OG is represented by P (I, J) and the pixel of the interstitial image cg is represented by p (i, j).

  Let M and N be integers representing the reduction ratios in the horizontal and vertical directions. For example, when the horizontal direction is reduced to 1/2 times and the vertical direction is reduced to 1/3 times, M = 2 and N = 3.

  In the conventional display method, the value p (i, j) of the reduced image cg is

It is represented by

  In this embodiment, f and g are dynamic integers and are values that vary depending on time. Therefore, the value of the reduced image p (i, j) displayed according to the time t is

It is. Equation (3) means that the remainder when time t is divided by an integer is f and g, respectively. The reduced image cg in this case appears to repeat a slight linear motion in an oblique direction. That is, depending on the unit of the time interval t (for example, 1 second), when M ′ = M and N ′ = N, a minute movement of one pixel or less is observed. Here, various functions can be adopted as the expression (3), and can be generally expressed as the following expression (4).

  A specific example is shown by the equation (5).

  When M ′ <M and N ′ <N, the expression (5) appears as a pattern in which the reduced image cg has an elliptical motion. The moving speed of these moving patterns is too fast to be recognized as high quality. Therefore, in order to appear as a slow motion, the moving angular velocity needs to be a certain value or less. The movement speed of the pattern on the display is

Therefore, if the distance between the display device and the observer is L, at least the following relational expression is a necessary condition. Here, px and py are the pitches in the x and y directions of the display device.

  As described above, by introducing the slow movement of the still image pattern, the non-uniformity inherent to the display, for example, an effect of making the partial defect of the display element inconspicuous is produced.

  As a third example, a display technique for dynamically changing the sampling pitch is shown. The required resolution of a confirmation image such as a thumbnail changes depending on the state of viewing. For example, a document thumbnail at the center of the screen is in a working state and often has a high importance. As a result, it is preferable to use a large thumbnail, but since thumbnails of document images that have not been used for a while are often less important, they are reduced in size and placed around the screen. As a result, as shown in FIG. 6, the thumbnail image (document T1) sequentially moves to the peripheral area according to environmental factors such as the elapsed time from the start of display, and is simultaneously reduced and displayed. In the present embodiment, a display method of large image data to which the present technique is applied is described. In this example, an image with a large amount of data can be displayed on a display device with a small display capability.

  In the present invention, as shown in FIG. 7, the brightness and density of the reduced image can be dynamically changed. When the time interval of change is short, it is averaged visually, so that a sufficiently high image quality can be ensured even with a reduced image.

  In the present invention, the reduction ratio of the reduced image cg may not be a fraction of an integer (n of 1 / n may not be an integer). FIG. 8 shows an example in which the reduction ratio is not an integer. In this example with an apparent resolution higher than the resolution restricted by the vertical and horizontal pixels of the display, the reduction ratio is dynamically displayed as 2/3. If the original image OG shown in FIG. 8A is displayed 3/2 times by an existing method, for example, it is displayed in either (B) or (C). According to the present embodiment, (B) and (C) can be dynamically displayed, and an image with high resolution can be displayed in a narrow display area.

  An image on which the reduced display method works most effectively is a still image having a high spatial frequency component. Typically, a document image corresponds to this.

It is a block diagram which shows the image processing apparatus of this invention. (A) shows a state in which the original image is divided and displayed on the vertical grid, and (B1), (B2), and (B3) are images displayed by reducing the horizontal axis direction of the original image. FIG. (A), (B), (C), (D) is a figure which shows the example of a display in the case of reducing along a horizontal axis in a prior art. (A), (B), (C), (D) is a figure which shows the example of a display which changes dynamically in embodiment of this invention. (A), (B), and (C) are explanatory diagrams when the original image OG is thinned out in the horizontal direction and the vertical direction. In this embodiment, it is explanatory drawing which shows a mode that it moves to a periphery area | region sequentially according to the elapsed time after a thumbnail image began to be displayed, and is reduced-displayed simultaneously. It is a figure which shows the reduced image when the brightness | luminance and density of a pixel change dynamically. In this embodiment, it is a figure which shows the example in case the reduction rate is not 1 / integer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image processing apparatus 11 Processing object image storage means 12 Reduced image creation means 13 Image information output means 14 Image display means 15 Operation means

Claims (13)

Processing target image storage means for storing the processing target image;
Reduced image creation means for generating a plurality of kinds of reduced images of the same resolution by thinning out pixels from the processing target image stored in the processing target image storage means;
Reduced image output means for sequentially selecting the plurality of reduced images according to the position of the common reference coordinates of the respective reduced images and outputting them to a display;
An image display device comprising: Processing target image storage means for storing the processing target image;
Reduced image creation means for generating a plurality of kinds of reduced images of the same resolution by thinning out pixels from the processing target image stored in the processing target image storage means;
Reduced image output means for sequentially automatically selecting the plurality of reduced images according to time changes and outputting them to a display;
An image display device comprising:   The image display apparatus according to claim 1, wherein the position of the common reference coordinates of the reduced image is changed by a user operation.   3. The image display apparatus according to claim 2, wherein the reduced image output means circulates and outputs the reduced image to the display with a time change that allows the user to recognize the reduced images individually but not continuously.   5. The image display device according to claim 1, wherein the plurality of kinds of reduced images include display luminance, display density, or display color of a pixel as a parameter in an attribute thereof.   6. The image display device according to claim 1, wherein a display size is changed depending on a display position of the reduced screen.   7. The reduced image output means has a function of selecting and outputting to a display in a fixed manner according to the position of a common reference coordinate of a single reduced image. Image display device.   8. The image display device according to claim 1, wherein when the reduction ratio of the reduced image is not an integer, the phase of the pixels constituting the original image is dynamically changed. A reduced image creation step for generating multiple types of reduced images of the same resolution by thinning out pixels from the processing target image;
A reduced image output step of sequentially selecting the plurality of reduced images according to a position of a common reference coordinate of each reduced image and outputting the selected reduced image to a display;
An image display method comprising: A reduced image creating step for generating a plurality of kinds of reduced images having the same resolution by thinning out pixels from the processing target image stored in the processing target image storage unit;
A reduced image output step of sequentially automatically selecting the plurality of reduced images according to time changes and outputting them to a display;
An image display method comprising:   11. The image display method according to claim 9 or 10, wherein, in the reduced image output step, the reduced image is circulated to a display with a time change that cannot be recognized individually but can be continuously recognized.   12. An image display program comprising a program for executing each step according to claim 9.   The computer-readable recording medium which recorded the program of Claim 12.