Image analysis – Color image processing
Reexamination Certificate
1999-08-17
2003-03-18
Do, Anh Hong (Department: 2624)
Image analysis
Color image processing
C382S237000, C345S421000, C345S582000, C348S223100
Reexamination Certificate
active
06535630
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an image display method wherein to extract a pixel having a value concerning a predetermined lightness value contained in the lightness range with a value concerning the predetermined lightness value as a threshold value in pixels making up an image, a pixel having a value concerning the lightness value of the image contained in the lightness range and a pixel having a value concerning the lightness value out of the lightness range are displayed on a display unit in different display colors, thereby enabling inspection of measurement, collation, discrimination, and the like, of a displayed object whose image is picked up, an image processing system for executing the method, and a recording medium recording therein a program for realizing the method.
2. Description of the Related Art
Available is an image display method using binarization processing for picking up an image of an object to be imaged such as an assembly or a part by an image pickup machine using a CCD (charge coupled device), comparing the lightness of each of pixels making up the picked-up image with a predetermined threshold value, and displaying the image on a screen of a display unit such as a liquid crystal monitor in white or black based on the comparison result.
The image display method using binarization processing is capable of extracting and displaying the image to be extracted on which inspection of measurement, collation, discrimination, and the like, is to be performed from the picked-up image of an object to be imaged by adjusting a threshold value; the method can be applied to inspection of the object to be imaged based on processing such as counting the pixels making up the image to be extracted.
The following two types of image display method for displaying an image undergoing binarization processing are available:
In the first image display method, a picked-up image is displayed on a display unit, an extraction area surrounding the extraction object of the image is set, and a lightness range is set with either or both of the upper limit value and the lower limit value allowing the pixels making up the extraction object to be extracted as a threshold value. Each pixel belonging to the extraction area and having the image lightness contained in the lightness range is displayed in white, each pixel belonging to the extraction area and having the image lightness out of the lightness range is displayed in black, and each pixel not belonging to the extraction area is displayed in one color.
In the first image display method, if more than one extraction area is set and the lightness range is set for each extraction area, when a pixel belongs to two or more extraction areas, it is displayed in the display color based on the lightness range set for any one of the extraction areas.
The second image display method is a method of displaying each pixel in white or black based on one lightness range for the whole display image.
However, in the first image display method, the pixel belonging to two or more extraction areas is displayed in the display color based on the lightness range set for any one of the extraction areas, thus more than one extraction result cannot be grasped at a time. In the second image display method, the whole display image is displayed in the display color based on one lightness range, thus more than one lightness range cannot even be set.
Further, in the first image display method, the pixels not belonging to the extraction area are displayed in one color as in the example given below, thus the positional relationship between the whole display image and the image displayed in each extraction area cannot be grapsed clearly.
FIGS. 13 and 14
are schematic views to show a product to be inspected according to the conventional first image display method. In
FIG. 13
, a rectangular label
90
with “ABC” printed on the side of a rectangular parallelopiped product
80
is put on the correct position at the center. In
FIG. 14
, the label
90
is put in the vicinity of the upper end part of the side of the product
80
.
If the product:
80
in
FIG. 14
is inspected for the label
90
according to the first image display method, binarization processing display is produced only in the extraction area set in the position intended where the lable
90
is to be detected, thus the product
80
cannot be inspected for the lable
90
. In addition, in the first image display method, the pixel not belonging to the extraction area is displayed in one color, thus the cause cannot be grapsed objectively as to whether or not the position where the label
90
is put is abnormal, whether or not the position of the object to be detected is abnormal, or whether or not the label itself is abnormal.
Furthermore, in the first image display method, if a pixel belongs to more than one extraction area, which extraction area the pixel is extracted based on the lightness range set for cannot be understood clearly and not at a time.
For example, to set more than one extraction area at the same position on a display image, set a different stepwise lightness range for each of the extraction areas, classify the object to be extracted based on the value concerning the lightness value, and perform various inspections, which lightness range the extracted pixel is contained in cannot be understood clearly and even if change is made to the lightness range to be used for extraction, the pixels contained in the lightness ranges cannot be understood at a time.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide an image display method wherein a plurality of extraction results can be grasped at a time., an image processing system for executing the method, and a recording medium recording therein a program for realizing the method.
According to a first aspect of the invention, there is provided an image display method wherein to extract in pixels making up an image, a pixel having a value concerning a lightness value of the image contained in a lightness range with a value concerning a predetermined lightness value as a threshold value, a pixel having a value concerning the lightness value of the image contained in the lightness range and a pixel having a value concerning the lightness value out of the lightness range are displayed on a display unit in different display colors, the image display method comprising the steps of: setting a plurality of extraction areas to which the pixels to be extracted in the image belong; setting lightness ranges in a one-to-one correspondence with the setup extraction areas, each lightness range for extracting the pixels in the corresponding extraction area; displaying each pixel belonging to one or more extraction areas with the value concerning the lightness value of the image being contained in all lightness ranges set for the extraction areas in a first display color; displaying each pixel belonging to one or more extraction areas with the value concerning the lightness value of the image being out of all lightness ranges set for the extraction areas in a second display color different from the first display color; and displaying each pixel belonging to more than one extraction area with the value concerning the lightness value of the image being contained in any of the lightness ranges set for the extraction areas and out of any of the lightness ranges in a third display color different from the first and second display colors.
According to a second aspect of the invention, there is provided an image display method wherein to extract in pixels making up an image, a pixel having a value concerning a lightness value of the image contained in a lightness range with a value concerning a predetermined lightness value as a threshold value, a pixel having a value concerning the lightness value of the image contained in the lightness range and a pixel having a value concerning the lightness value out of the lightness range are displayed on a display unit in different display colors, the image
Do Anh Hong
Keyence Corporation
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