JPH04172497A - Image display method - Google Patents

Abstract

PURPOSE:To give more continuous impression of a display in appearance/ elimination of an image by displaying continuously an image while changing its positions. CONSTITUTION:Data of an image which should appear are stored in advance in a two-dimensional array, and an image element in the origin (0,0) of the array defines a position in the image coordinates as the position of the image. The increasing direction of X axis is considered as right horizontal direction and the increasing direction of Y axis is considered as down vertical direction. The position in which the image is desired to be displayed lastly is represented by (x,y), and speed given to the image is represented by a two-dimensional vector (c,d). Here, the speed is defined as a number of pixels for image move ment per unit time. When the image position is (x-nc, y-nd), (m) is designed to the minimum n as the image goes completely to outside of the screen (where m>0). At this time, in order to express that the image comes from the outside of the screen, it is necessary to change the image position (m) times to perform display, the display position after (t) unit time from the beginning of the move ment can be expressed as (X+(t-m+1)c, y+(t-m+1)d). After (m) unit time, the image can be displayed at (x,y).

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a computer system having an image display means represented by a CRT.

(Prior Art) Conventionally, in computer display, when an image such as a window appears on the screen, the final appearance position is
It was common for images to suddenly appear. Also, even if you want to delete images such as windows from the screen,
It was common for it to suddenly disappear.

(Problem to be solved by the invention) However, in the natural world, phenomena in which objects suddenly appear or disappear are rare, and in order to create an operating environment that feels natural to humans, the above-mentioned display method is a visual continuity. It was thought that it lacked functionality and had room for improvement.

(Means for Solving the Problems) The first image display method of the present invention expresses how the image is moving across the screen when it appears on the screen or disappears from the screen. In order to do this, the system is characterized by continuously displaying images while changing their positions.

In the second image display method of the present invention, when an image appears on the screen or disappears from the screen, the image is generated by constant velocity movement in order to express the appearance of the image moving on the screen. Images with motion blur added,
It is characterized by continuous display while changing the position.

In the third image display method of the present invention, when an image appears on the screen or disappears from the screen,
In order to express the appearance of an image moving across the screen, images are continuously displayed while changing their positions, with the effect of motion blur that occurs due to constant speed motion, and then the motion blur that occurs due to deceleration motion just before the image stops. It is characterized by continuously displaying images with a motion blur effect.

(Function) The first to third image display methods of the present invention all achieve visual continuity by successively changing the display position of images and making the operator feel that the images are moving. It takes advantage of the fact that it can improve

In the first image display method described above, movement of an image is expressed by simply changing the position and displaying the image. Although the continuity of motion is inferior to the second and third methods described above, it has the advantage of being easy to implement.

The above-mentioned second image display method expresses more natural movement by imparting to the displayed image the effect of motion blur that is recorded when an object moving at a constant speed is photographed. In this method, it is necessary to prepare one type of motion blur image. Furthermore, in order to blend the motion blur image with the background, a color mixing operation between the motion blur image and the background screen is required every time the display position is changed.

In the third image display method described above, in addition to the effects of the second image display method described above, when the image stops, an image with the effect of motion blur during deceleration motion is displayed. This method can express more natural movements than the previous method. In the second method, when the image stops moving, the speed suddenly changes from a constant state to 0, and there is a moment when the continuity of speed is broken. However, in the third method, the speed can also be continuous. In this method, it is necessary to prepare one type of motion blur image for constant speed motion and one or more types of motion blur images for deceleration motion. Furthermore, in order to blend the motion blur image with the background, a color mixing operation between the motion blur image and the background screen is required every time the display position is changed.

(Example) An example in which an image appears on a screen using the first image display method of the present invention will be described.

Assuming that the data of the image to be displayed is stored in advance in a two-dimensional array, the origin of the array (0,0)
The position that the corresponding pixel occupies in the screen coordinates is called the image position. Also, following the general display method of computers, the horizontal right direction is the X axis (one point of the two-dimensional array
The vertical downward direction is the increasing direction of the Y-axis (the second subscript in the two-dimensional array).

The final position where the image is to be displayed is expressed as (x, y), and the speed given to the image is expressed as a two-dimensional vector (c, d). Here, the speed is defined as the number of pixels that an image moves in one display time (which means one frame when a CRT is used as a display device). Image position (X-nc.

y-nd), let m be the minimum n at which the image completely goes outside the screen (where mho). At this time, in order to express the appearance that the image is coming from outside the screen,
It is necessary to change the position of the image m times and display it, and the display position after the firing time from the start of the movement is (x + (t −
m+1)c, y+(t-m+1)d). m
After the unit time, the image can remain displayed at (X, y).

FIG. 1 is a diagram showing details of the algorithm of the first embodiment of the present invention.

In FIG. 1, in step 11, the number of times m of display is determined. In step 12, it is determined whether m-1 times of display have been completed. In step 13, the position where the image is to be drawn is determined, and the image is drawn on the screen. Step 14
After the image drawn in step 13 is displayed for one unit time, the image is erased from the screen and the screen is restored. In step 15, an image is drawn at the final position.

If you want to make the images disappear from the screen, just follow the order of the positions where the images are displayed in reverse. Furthermore, there is no restriction that the shape of the image must be rectangular.

An example in which an image appears on a monochromatic multi-gradation display screen using the second image display method of the present invention will be described.

Here, although there are no particular restrictions on the shape of the image, it is assumed that the image is included in a rectangular area formed by vertical and horizontal lines with a vertical length b and a horizontal length a. This image appears from the top of the screen, moves vertically downward at a constant speed C, and finally (x
, y) will be explained as an example. In addition,
Definitions of image position, speed, etc. shall follow the first embodiment.

First, a procedure for obtaining a motion puller image when the image is moved downward at speed C will be described. Let f be a two-dimensional array that stores image data. Here, it is assumed that the value of f is all O outside the image. Indicates the presence/absence of an image,
Let r be a two-dimensional array whose values are 1 or 0. Then, create a two-dimensional array that stores the motion blur image as g
, · Let h be a two-dimensional array that stores the color mixing ratio with the background image. given, a.

b+ c+ ”+ 3'+fs To find g and h from r, change i from 0 to a-1 and j from 0 to h+c-
1 and perform the following calculations.

When the position of the motion blur image is (x, y-ne), let m be the minimum n at which the motion blur image completely goes out of the screen (!Lm>o). At this time, in order to express a series of movements of the image, it is necessary to change the position of the image m times and display it, and the display position after a bullet time from the start of the movement is (x, y + (t - m+1)c) may be used.

Here, (i) of a two-dimensional array of motion blur images.

The calculation formula for calculating the value to be actually drawn from the value of the pixel corresponding to j) is shown below.

(value of background pixel that overlaps with pixel (i, j))
(i, j)+(g(i, j) FIG. 2 is a diagram showing details of the algorithm of the second embodiment of the present invention.

In step 21, a motion blur image is generated. In step 22, the number of times m of display is determined. Step 23
Then, it is determined whether or not the display has been completed m-1 times. In step 24, the position where the motion puller is to draw the image is determined, and the image is drawn on the screen. Step 25
In step 24, after the drawn motion blur image is displayed for one unit time, the motion blur image is erased from the screen and the screen is restored. In step 26, an image is drawn at the final position.

If you want to make the images disappear from the screen, just follow the order of the positions where the images are displayed in reverse. Also, the above explanation is for the case where the display is monochrome and multi-gradation, but to expand to color display, prepare f and g for three colors of KGB, and calculate array g and perform color mixing calculations in three systems. This can be achieved by doing.

An example in which an image appears on a monochromatic multi-gradation display screen using the third image display method of the present invention will be described.

Here, although there are no particular restrictions on the shape of the image, it is assumed that the image is included in a rectangular area composed of vertical and horizontal lines with a vertical length b and a horizontal length a. Let us consider the case where this image appears from the top of the screen, moves vertically downward at a constant speed C, and after decelerating due to constant negative acceleration -0 in one unit of time just before it stops, it comes to rest at (X, y). This will be explained as an example.

Note that the definitions of the image position, speed, etc. are in accordance with the first embodiment.

First, a procedure for obtaining a motion blur image when the image is moved downward at speed C will be described. Let f be a two-dimensional array that stores image data. Here, it is assumed that all values of f are 0 outside the image. Let r be a two-dimensional array having a value of 1 or 0 indicating the presence/absence of an image. Let g be a two-dimensional array that stores a motion blur image, and h be a two-dimensional array that stores a color mixing ratio with a background image.

Given a, b, c.

To find g and b from x+'lz'sr, i is O
to a-1, and the following calculations are performed by changing j from 0 to b+c-1.

g(i,j)=Σf(i,j−e+i+k)X −km
OC j (i, j) = 'i'r (i, j-c+1+k)X±
kmO0 Next, a procedure for obtaining a motion blur image during deceleration will be described. Let p be a two-dimensional array that stores a motion blur image during deceleration motion, and let q be a two-dimensional array that stores a color mixing ratio with a background image. i from 0 to a-1, j from O
The following calculation is performed between b+e/2-1 and the values of each array of p and q are determined.

Set the position of the constant velocity motion blur image to (x, y-ne
−2/c), let m be the minimum n at which the constant velocity motion blur image completely goes out of the screen (where m>0). At this time, in order to express a series of image movements, the constant speed motion blur image is displayed with its position changed m times, the deceleration motion blur image is displayed only once, and then the still image is displayed. Move. The display position of the constant velocity motion blur image t unit time after the start of the movement may be (x, y+(t-m+1)c-c/2). The display position of the deceleration motion blur image is (x
, y −2/c). Here, a calculation formula for calculating the value to be actually drawn from the value of the pixel corresponding to (i, j) in the two-dimensional array of the constant velocity motion blur image is shown below.

(value of background pixel that overlaps with pixel (i, j))X (1-
h(i,j)+(g(i,j) deceleration motion The calculation for drawing a motion blur image is similar.

FIG. 3 is a diagram showing details of the algorithm of the third embodiment of the present invention.

In step 31, a constant velocity motion blur image is generated. In step 32, a deceleration motion motion blur image is generated. In step 33, the number of times m of display is determined. In step 34, it is determined whether or not the display has been completed m-2 times. In step 35, the position where the constant velocity motion blur is to be drawn is determined, and the position is drawn on the screen. In step 36, after the constant velocity motion motion blur image drawn in step 35 is displayed for one unit time, the constant velocity motion motion blur image is erased from the screen and the screen is restored. Step 37
Now, find the position to draw the deceleration motion blur image and draw it on the screen. In step 38, after the deceleration motion blur image drawn in step 37 is displayed for one unit interval, the deceleration motion motion blur image is erased from the screen and the screen is restored. In step 39, an image is drawn at the final position.

If you want to make the images disappear from the screen, just follow the order of the positions where the images are displayed in reverse. Furthermore, in this embodiment, the motion blur image of the deceleration movement is displayed for only one unit time, but in reality, the cover may be displayed for two or more units of time. In that case, it is possible to express a more natural deceleration motion, but it is necessary to create two or more types of deceleration motion motion blur images, which complicates the processing. In addition, in the examples given here, the acceleration was set to a constant value, but since it is not necessary that the acceleration be constant, even if the acceleration is given as a function of time (for example, a trigonometric function, etc.),
It is possible to express an image in which the speed of the image decreases continuously. Also, the above explanation is for the case where the display is monochrome and multi-gradation, but expansion to color display is possible by changing f3g to RGB3.
This can be achieved by preparing colors and calculating the array g and performing three color mixing operations.

(Effects of the Invention) As described above, according to the present invention, it is possible to give an impression to the operator that the display when an image appears and disappears is more continuous. Furthermore, it is possible to improve the basic interface of computers.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an algorithm of a first embodiment of the present invention. FIG. 2 is a diagram showing an algorithm of a second embodiment of the present invention. FIG. 3 is a diagram showing an algorithm of a third embodiment of the present invention.

Claims (3)

[Claims] (1) When an image appears on the screen or disappears from the screen, the image is continuously displayed while changing its position in order to express the appearance of the image moving across the screen. Image display method. (2) When an image appears on the screen or disappears from the screen, an image with the effect of motion blur that occurs due to constant speed movement added to express the appearance of the image moving across the screen. An image display method characterized by continuously displaying images while changing their positions. (3) When an image appears on the screen or disappears from the screen, an image with the effect of motion blur that occurs due to constant speed movement added to express the appearance of the image moving across the screen. An image display method characterized by continuously displaying , while changing its position, and further continuously displaying an image with a motion blur effect generated by deceleration movement immediately before the image stops.