Method and apparatus for image processing
First Claim
1. An image processing apparatus having stored registered images, comprising:
- means for determining whether a ratio of a total number of black pixels to a total number of black pixels and white pixels in an original test image is within a first predetermined range;
binary converting and fixing means for converting the original test image into a binary test image and for fixing said binary test image for comparison, said binary converting and fixing means reconverting and refixing until said original test image has said ratio within the first predetermined range;
memory means for storing said binary test image having said ratio within said first predetermined range and a binary converted one of said stored registered images, said one of said stored registered images being converted and fixed in the same manner as said test image;
means for aligning said binary test image with said binary registered image to compare said two binary images; and
means for comparing said two binary images to determine whether said binary test image is the same as said binary registered image, said binary test image having said ratio within said first predetermined range being used for comparison with said binary registered image by said comparing means.
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Abstract
The present invention provides an image processing apparatus and method comprising a memory for storing address information of a binary registered image. An original test image is converted into a binary test image so that the ratio of the total number of black pixels to the total number of black and white pixels lies within a predetermined range. The binary test image is aligned to the binary registered image in order to compare the two images. A degree of concordance between the binary test image and the binary registered image is determined if the comparison satisfies a predetermined condition of concordance. A degree of discordance between the binary test image and the binary registered image is determined if the comparison satisfies a predetermined condition of discordance. The binary test image is determined to originate from the same object as the binary registered image according to the degree of concordance and the degree of discordance between the two images.
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Citations
10 Claims
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1. An image processing apparatus having stored registered images, comprising:
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means for determining whether a ratio of a total number of black pixels to a total number of black pixels and white pixels in an original test image is within a first predetermined range; binary converting and fixing means for converting the original test image into a binary test image and for fixing said binary test image for comparison, said binary converting and fixing means reconverting and refixing until said original test image has said ratio within the first predetermined range; memory means for storing said binary test image having said ratio within said first predetermined range and a binary converted one of said stored registered images, said one of said stored registered images being converted and fixed in the same manner as said test image; means for aligning said binary test image with said binary registered image to compare said two binary images; and means for comparing said two binary images to determine whether said binary test image is the same as said binary registered image, said binary test image having said ratio within said first predetermined range being used for comparison with said binary registered image by said comparing means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image processing apparatus having stored registered images, comprising:
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means for determining whether a ratio of a total number of black pixels to a total number of black pixels and white pixels in an original test image is within a first predetermined range; binary converting and fixing means for converting the original test image into a binary test image and for fixing said binary test image for comparison, said binary converting and fixing means reconverting and refixing until said original test image has said ratio within the first predetermined range, said binary converting and fixing means including means for dividing said original test image into a plurality of partial regions, means for obtaining an average brightness for each of the plurality of partial regions, means for determining a threshold brightness value for each of the plurality of partial regions and for converting said original test image into a binary test image with reference to the threshold brightness value of each said partial region and regions neighboring each said partial region, and means for obtaining the ratio of the total number of black pixels to the total number of black and white pixels, and for repeating said binary conversion of said original test image to a binary test image to change said threshold brightness value until said ratio of the total number of black pixels to the total number of black and white pixels is within the first predetermined range, the binary test image obtained after the repeated conversion being used for comparison with said binary registered image; memory means for storing said binary test image having said ratio within said first predetermined range and a binary converted one of said stored registered images, said one of said stored registered images being converted and fixed in the same manner as said test image; means for aligning said binary test image with said binary registered image to compare said two binary images; and means for comparing said two binary images to determine whether said binary test image is the same as said binary registered image, said binary test image having said ratio within said first predetermined range being used for comparison with said binary registered image by said comparing means. - View Dependent Claims (9)
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10. An image processing apparatus having stored registered images, comprising:
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means for determining whether a ratio of a total number of black pixels to a total number of black pixels and white pixels in an original test image is within a first predetermined range; binary converting and fixing means for converting the original test image into a binary test image and for fixing said binary test image for comparison, said binary converting and fixing means reconverting and refixing until said original test image has said ratio within the first predetermined range; memory means for storing said binary test image having said ratio within said first predetermined range and a binary converted one of said stored registered images, said one of said stored registered images being converted and fixed in the same manner as said test image; means for aligning said binary test image with said binary registered image to compare said two binary images; means for discovering holes in said binary registered image; and means for comparing said two binary images to determine whether said binary test image is the same as said binary registered image, said comparing means judging concordance of said binary test image and said binary registered image when both an address of a hole in said binary registered image and an address of a hole in the binary test image satisfy a predetermined relationship.
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Specification