JP2817423B2 - Image display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more particularly to an image display device having image display means such as a CRT.

[0002]

2. Description of the Related Art In a conventional image display apparatus, when an image displayed on a CRT is to be controlled by a computer and the user wants to know the details of a certain portion of the image, the entire image is deleted and the image is enlarged. The system which displays again is common.

[0003]

The above-mentioned conventional image display device cannot display an enlarged image of an arbitrary portion at the same time while displaying the entire image on a CRT. When working while being conscious, there is a problem that an operation for switching the screen between the whole and the part is required, and the work becomes complicated.

[0004]

An image display apparatus according to the present invention.
Comprises: a first image storage unit for storing image information;
When reading an image that stores the same image as the image storage unit
A second image storage unit having a function of performing enlarged display on the
An area from which the image is read from the first image storage unit;
2 with a region defined from the image storage unit
Area designation information storage unit for outputting designation information, and the designation information
Image information from the first and second image storages according to
And an image selection unit for selecting the image on the screen .

[0005]

[0006]

According to the image display device of the present invention, image information output from two different storage means is selected and displayed based on information having different magnifications representing images, so that the entire image and the partially enlarged image can be displayed on the same screen. Can be displayed simultaneously.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a first embodiment of the present invention.

The image information used for the entire display is stored in the first image storage means 11, and the image information of a high magnification for partial display is stored in the second image storage means 12, respectively. A designated concession defined by numerically defining each of an area to be displayed at a low magnification, an area for enlarging a part, and an area to be painted with a specific color which is neither of them, if necessary. Is stored. Considering as an example the case of performing the partial enlarged view in the form of a magnifying glass as shown in FIG. 3, the region A portion corresponding magnifying lens to view an enlarged, the outer magnifying glass in the region B to be displayed in low magnification, magnifying glass itself Is defined as a region C to be painted with a specific color. First image storage unit 11, second image storage unit 1
2. The area designation information storage means 13 sequentially outputs each information stored according to the raster scan. The second image storage unit 12 and the area designation information storage unit 13 have a function of receiving a designation of display start coordinates from a processing unit 14 typified by a CPU of a computer and changing a raster scan range.

Considering the example of a magnifying glass, the magnifying glass can be seen to move on the screen by changing the display start coordinates of the area designation information storage means 13. Here, in order for the partially enlarged image to appropriately appear in the area A corresponding to the lens,
In the center coordinates of the lens portion of the magnifying glass, the point in the image for displaying the entirety and the point in the image for displaying the enlarged portion need to match in terms of content. For example, the origin of the image is located at the coordinate origin of the first and second image storage means 11 and 12, and the center of the lens of the magnifying glass is located at the coordinate origin of the area designation information storage means 13. Suppose that the magnification of the image of the means 12 is m times that of the image of the second image storage means 11. Coordinates (x, y) of the whole image
When displaying the magnifying glass so that the lens center is located at
The display start coordinates of the area designation information storage means 13 are (-x,-
y), and the display start coordinates of the second image storage means 12 are (x (m-1), y (m-1)). That is, when the magnifying glass is moved, the change amount of the display start coordinate given to the second image storage means 12 is (m-1) times the change amount of the display start coordinate given to the area designation information storage means 13 and in the opposite direction. Must be. The image selecting means 15 selects one of the output from the first image storing means 11, the output from the second image storing means 12, and a specific color which is neither of them according to the information of the area specifying information storing means 13. , And outputs information to the display means 16.

FIG. 2 is a block diagram of a second embodiment of the present invention.

The low-magnification image information is stored in a first image storage unit 21.
And the same image information stored in the first image storage unit 21 is stored in the second image storage unit 22 for partial display. The area to be displayed at low magnification is stored in the area designation information storage unit 23.
The designated information is defined by numerically defining each of the area , the area in which the part is to be enlarged, and the area to be painted with a specific color which is neither of them, if necessary. FIG.
Considering a case where a partially magnified display is performed in the shape of a magnifying glass shown in FIG. 1, a portion corresponding to a lens of the magnifying glass is in an area A to be enlarged, and the outside of the magnifying glass is in an area B displayed at a low magnification .
The magnifying glass itself is defined as a region C to be painted with a specific color. The first and second image storage units 21 and 22 and the area designation information storage unit 23 sequentially output stored information according to raster scanning. The second image storage unit 22 and the area designation information storage unit 23 are a processing unit 2 represented by a CPU of a computer.
4, a mechanism for changing the range in which the raster scan is performed upon receiving the designation of the display start coordinates. Second image storage unit 22
Has a display enlargement function, and can enlarge information of one pixel output according to the raster scan by m times vertically and horizontally and output it as m × m pixels.

Taking the example of a magnifying glass, the magnifying glass can be seen moving on the screen by changing the display start coordinates of the area designation information storage unit 23. Here, the area A corresponding to the lens
In order for the partially enlarged image to appear properly, in the center coordinates of the lens portion of the magnifying glass, the point in the image for displaying the whole and the point in the image for displaying the enlarged portion match. Need to be. For example, the origin of the image is located at the coordinate origin of the first and second image storage units 21 and 22,
The center of the lens of the magnifying glass is located at the coordinate origin of the area designation information storage unit 23, and the second image storage unit 22 uses the display enlargement function to store information of m times the image of the first image storage unit 21. Let's say it is output. Coordinates (x, y) of the whole image
When displaying the magnifying glass so that the lens center is located at
The display start coordinates of the area designation information storage unit 23 are (−x, −
y), and the display start coordinate of the second image storage unit 22 is (x
(1-1 / m), y (1-1 / m)). That is,
When the magnifying glass is moved, the change amount of the display start coordinate given to the second image storage unit 22 is (1-1 / m) times the change amount of the display start coordinate given to the area designation information storage unit 23, and in the opposite direction. Must be. The image selection unit 25 uses the first image storage unit 2 according to the information in the area designation information storage unit 23.
The output from the first unit, the output from the second image storage unit 22, or a specific color that is neither of them is selected, and information is output to the display unit 26.

In this way, it is possible to enlarge and pay attention to the portion while looking at the entire image. An effective interface can be constructed for an application that handles images such as works of art and maps.

[0014]

As described above, according to the present invention, image information having different magnifications output from the first and second storage means is selected on the basis of information designating the display magnification and displayed on the same screen. This eliminates the need to switch between the entire screen to be displayed and the partially enlarged screen, thereby facilitating the image processing operation.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram for explaining the operation of the first and second embodiments.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 1st image storage means 12 2nd image storage means 13 area specification information storage means 14 processing means 15 image selection means 16 display means 21 1st image storage part 22 2nd image storage part 23 area definition information storage part 24 processing unit 25 image selection unit 26 display unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G09G 5/00-5/40 G06F 3/14 G06T 3/40

Claims (1)

(57) [Claims] A first image storage unit for storing image information;
A second image storage unit having a function of performing an enlarged display at the time of reading an image storing the same image as the first image storage unit, an area from which the image is read from the first image storage unit, An area designation information storage unit for outputting designation information in which an area read from the second image storage unit is defined; and a screen for selecting image information from the first and second image storage units according to the designation information An image display device comprising: an image selection unit that is displayed on a display device.