JPH0594528A - Method for expanding graphic - Google Patents

Abstract

PURPOSE:To obtain a graphic expanding method capable of preventing the generation of an erosion on a graphic by removing a center picture element from a target whose brightness value is to be converted when a graphic picture element in contact with another group is the center picture element. CONSTITUTION:A prescribed convolution in a labeled image is inputted. Then whether the center picture element of the convolution is a graphic picture element or not is judged. When another graphic picture element exists around the center picture element when the center picture element is a graphic picture element, expansion processing is not executed. When the center picture element is not a graphic picture element and when the center picture element is a graphic picture element, but no other picture element exists around the center picture element, the brightness value of a picture element having the maximum brightness value is applied to the center picture element to execute expansion processing. Whether the convolution to be processed is the end of the image or not is judged, and when the convolution is not the end of the image, the same processing is repeated until the end of the image. Consequently the number of groups in the image can be held and an expanded graphic prevented from being eroded by other graphics can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic expansion method,
In particular, the present invention relates to a graphic expansion method for giving a central pixel a maximum luminance value within a predetermined convolution in a label image.

[0002]

2. Description of the Related Art Conventionally, in this type of graphic expansion,
When adjacent shapes come into contact as a result of expansion, the phenomenon that a figure with a higher label value erodes a lower figure,
The number of groups could change.

[0003]

SUMMARY OF THE INVENTION The present invention was devised in order to solve such conventional problems, and an object thereof is to provide a graphic expansion method capable of preventing graphic erosion.

[0004]

In the graphic expansion method according to the present invention, graphic pixels in contact with another group are excluded from the subject of luminance value conversion.

[0005]

Even if a plurality of figures are expanded, erosion between the figures can be avoided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of a graphic expansion method according to the present invention will be described with reference to the drawings. First, a predetermined convolution of the label-processed image (FIG. 2) is captured (step 1-1). Then, it is determined whether the central pixel of the convolution is a graphic pixel (step 1-
2). If the central pixel is a graphic pixel, then it is determined whether or not there is another graphic pixel in the vicinity (step 1-
3). When there are other graphic pixels around (Fig. 6A)
If the brightness value of other graphic pixels is high after the expansion process,
Eroded by the other figures. Therefore, in order to prevent such erosion between figures, the central pixel is not subjected to expansion processing (FIG. 6B), and steps 1 to 5 are reached.

When it is judged in step 1-2 that the central pixel is not a graphic pixel (FIG. 4A), and when in step 1-3 the central pixel is a graphic pixel but no other graphic pixel exists in the surroundings (FIG. 5A). In step 1-4, the brightness value of the pixel having the maximum brightness value is given to the central pixel in the convolution, and expansion processing is performed (step 1-).
4). Only in such a case, expansion processing is performed, and the respective results are shown in FIGS. 4B and 5B. In step 1-5, it is determined whether or not the convolution to be processed is the image end, and if it is not the image end, the processes from step 1-1 are repeated. If the convolution is at the end of the image, the process ends here, and the dilation process is performed without any change in the number of groups and without erosion between figures (FIG. 3).

[0008]

As described above, according to the present invention, it is possible to obtain an expanded figure in which the number of groups is maintained and there is no erosion between figures.

[Brief description of drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a label image.

FIG. 3 is a conceptual diagram in which a label image is subjected to expansion processing.

FIG. 4A is an example of performing expansion processing.

FIG. 4B is a conceptual diagram in which expansion processing is applied to FIG. 4A.

FIG. 5A is another example of performing expansion processing.

FIG. 5B is a conceptual diagram in which expansion processing is applied to FIG. 5A.

FIG. 6A is an example in which expansion processing is not performed.

FIG. 6B is a conceptual diagram of FIG. 6A without expansion processing.

Claims (1)

[Claims] 1. A graphic dilation method for providing a central pixel with a maximum brightness value within a predetermined convolution in a label image, and when a graphic pixel in contact with another group is the central pixel, the brightness value of the central pixel is calculated. A graphic expansion method characterized by excluding the object from conversion.