Method and apparatus for estimation of image magnification levels
AssigneeFuji Xerox Co., Ltd.
InventorsManabu Akamatsu, Kenichi Takahashi, Yoshinori Awata
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Abstract
Disclosed is an image processing system for processing an input image containing an object image of a predetermined pattern which may have been magnified, the image processing system. The image processing system comprises: one or more characteristic quantity computing means 51A to 51D, 52 and 53 for computing a characteristic quantity representative of a characteristic of an object image possibly contained in an input image; and a plurality of magnification estimating means 61 to 63 for computing a magnification on the basis of one or more characteristic quantities computed by and output from the one or more characteristic quantity computing means 51A to 51D, 52 and 53.
Claims20
An image processing system for processing an input image containing an object image with a predetermined pattern which may have been magnified,
- said image processing system comprising:
- characteristic quantity computing unit that computes a plurality of characteristic quantities of said object image, wherein said plurality of characteristic quantities include pixel information representing the predetermined pattern of said object image, said pixel information includes ON pixel information and ON/OFF inverse information, said ON pixel information includes the number of ON pixels, and said ON/OFF inverse information includes ON and OFF inverse pixels;
- a plurality of magnification estimating units that estimate a plurality of magnification levels on the basis of said plurality of characteristic quantities computed by and output from said characteristic quantity computing unit;
- and
- judging unit that judges whether or not said object image is present in said input image, on the basis of whether or not the plurality of magnification levels estimated by said plurality of magnification estimating units are coincident with one another.
A method of processing an input image containing an object image with a predetermined pattern which may have been magnified,
- said image processing method comprising the steps of:
- computing a plurality of characteristic quantities of said object image, wherein said plurality of characteristic quantities include pixel information representing the predetermined pattern of said object image, said pixel information includes ON pixel information and ON/OFF inverse information, said ON pixel information includes the number of ON pixels, and said ON/OFF inverse information includes ON and OFF inverse pixels;
- estimating a plurality of magnification levels on the basis of said plurality of characteristic quantities computed by said characteristic quantity computing step;
- and
- judging whether or not said object image is presented in said input image, on the basis of whether or not the plurality of magnification levels estimated by said magnification estimating step are coincident with one another.
An image processing system for processing an input image containing an object image with a predetermined pattern which may have been magnified,
- said image processing system comprising:
- characteristic quantity computing unit that computes a plurality of characteristic quantities of said object image, wherein said plurality of characteristic quantities include pixel information representing the predetermined pattern of said object image, said pixel information includes ON pixel information and ON/OFF inverse information, said ON pixel information includes the number of ON pixels, and said ON/OFF inverse information includes ON and OFF inverse pixels;
- and
- a plurality of magnification estimating units that estimate a plurality of magnification levels on the basis of said plurality of characteristic quantities computed by and output from said characteristic quantity computing unit.
Dependencies are inferred from the claim text.