JP2000242803A - Image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a user to specify the range of an enlarged image as the user intends by connecting a last mouse click point to the current position of a current mouse pointer with a straight line, checking which side of the straight line the center of the pixels of the image is, and displaying the outward shape of the pixels on the image side with a broken line. SOLUTION: For example, the mouse pointer is assumed to move from a point 1 to a point 2 by moving the mouse. The points 1 and 2 are connected by a straight line and it is checked whether the center of the pixel of the image is on the image side of segments 1 and 2 or outside the image. The rectangle having its diagonal between the mouse pointer points 1 and 2 is extracted first and the center of the pixels in the rectangle is checked. Here, it is checked which of the sides divided by the segment connecting the mouse pointer points 1 and 2 there are more centers of pixels of the image on. The side where there are more centers is the inside of the image. Namely, pixels A, B, C, E, F, G, H, and I are on the image side and a pixel D is outside the image. Then, the outward shape of the pixels on the image side are connected by a broken line and displayed on a display device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of displaying an image on a CRT when determining the range of the image when processing the image on the CRT.

[0002]

2. Description of the Related Art When an image is processed on a CRT, particularly when the image is a fine image, the image is enlarged and displayed on a pixel-by-pixel basis. When specifying the range of the enlarged image, the conventional image processing apparatus displays the locus of the mouse as it is by a broken line, and displays the locus in pixels after the range is determined.

[0003]

However, in the conventional image processing apparatus, when the range of the enlarged image is designated, the trajectory of the mouse is displayed as it is by a broken line, and is displayed in pixels after the range is determined. Some didn't know which pixel was selected, and it was difficult to specify the range as expected.

The present invention has been made in view of the above-described problems, and provides an image processing apparatus that displays which range is specified in units of pixels even before the range is determined when specifying the range of the enlarged image. Aim.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when an image is processed on a CRT in order to solve the above-mentioned problems, when the range of the image is specified by a mouse or the like, the range specified by the user is specified. To be able to.

Here, when the mouse pointer moves when designating the range of the image, the previous mouse click point and the current position of the mouse pointer are connected by a straight line, and the center of the pixel of the image is located on one of the straight lines. And displaying the outline of the pixel on the image side with a broken line.

[0007]

According to the first aspect of the present invention, when a range of an enlarged image is designated, even before confirmation, which range is designated is displayed in pixel units, and the user's thoughts are given. It has the effect that the range can be specified as follows.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 is a block diagram of an image processing apparatus according to an embodiment of the present invention. 1 is a CPU that controls the apparatus and performs data processing, 2 is a ROM that stores programs and the like, and 3 is a RAM that stores various data. Reference numeral 4 denotes an input unit such as a keyboard and a mouse, and 5 denotes a display device (CRT).

The operation of the thus configured image processing apparatus according to this embodiment will be described below with reference to the flowchart of FIG.

Assume that an image A is displayed on the display device 5 of FIG. When it is desired to cut out a part of this image, the user clicks points 1, 2, and 3 in FIG. 3 in order with the mouse 4 to create a polygon and determine the range to cut out. FIG. 4 is an enlarged view of a part of the image of FIG. The hatched portion is the image, and point 1 is the point clicked with the mouse 4 last time. Suppose that the mouse 4 is moved and the mouse pointer moves to a point 2 in FIG. 4 (step 1). Points 1 and 2 in FIG. 4 are connected by a straight line, and it is checked whether the pixel center of the image is on the image side of the line segments 1 and 2 or outside the image (step 2). First, a rectangle having the mouse pointer points 1 and 2 as diagonal lines is extracted (FIG. 5). Find the center of the pixel in the rectangle. Here, it is checked which side divided by the line segment connecting the mouse pointers 1 and 2 has more pixel centers in the image. The larger one is inside the image. However, when the number is the same, or when the mouse pointers are aligned on a straight line (the x and y coordinates of the two mouse pointers are the same), the upper left corner of the coordinates is unconditionally set to the inside of the image. In FIG. 5, pixels A, B, C, E, F, G, H,
I is the image side and pixel D is outside the image. The outlines of the pixels on the image side are connected by broken lines and displayed on the display device 5 of FIG. 1 (FIG. 6).

In this way, when specifying the range of the image, the user can specify the desired range.

[0012]

According to the present invention, when processing an image on a CRT, particularly when the image is a fine image, the image is enlarged and displayed on a pixel-by-pixel basis. When the range of the enlarged image is specified, even before the determination, the range that is specified is displayed in units of pixels, and the range desired by the user can be specified.

[Brief description of the drawings]

FIG. 1 is a block diagram of an image processing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart of a process for displaying a designated range of an image according to the embodiment;

FIG. 3 is a diagram showing an example of a designated range of an image according to the embodiment;

FIG. 4 is a diagram showing an example of an enlarged image and a mouse pointer in the embodiment.

FIG. 5 is an exemplary view showing an example of a rectangle having a mouse pointer of an enlarged image as a diagonal in the embodiment;

FIG. 6 is a diagram showing an example of display of a specified range of an enlarged image according to the embodiment;

[Explanation of symbols]

 1 CPU 2 ROM 3 RAM 4 Input unit 5 (CRT)

Claims (1)

[Claims] When an image is processed on a CRT, particularly when the image is a fine image, the image is enlarged and displayed on a pixel-by-pixel basis. When specifying the range of the image with a mouse,
An image processing apparatus for displaying a selection range of an image by a broken line or the like along the outer shape of a pixel, and displaying which range is specified in units of pixels even before the determination of the range of the image. .