Original-discrimination system for discriminating special document, and image forming apparatus, image processing apparatus and duplicator using the original-discrimination system
First Claim
1. An original discrimination system for determining whether or not an original image is identical to a predetermined reference image, in response to data concerning said original image being input, duplication of said reference image being inadmissible, the determination comprising the steps of:
- a) removing extremely fine lines and isolated dots from the original image, b) determining whether in a predetermined area fine lines have been recognized in a number which exceeds a predetermined limit to be allocated to the original image;
c) interrupting the copying operation when the number equals or exceeds the predetermined limit, and continuing the copying operation when the number falls below the predetermined limit;
d) determining whether in the predetermined area fine lines are present with equal or unequal distance; and
e) interrupting the copy operation if the fine lines are recognized with unequal distance.
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Accused Products
Abstract
An original image comprises a printed region on which a predetermined printed matter is realized and a background region on which no printed matter is realized. The shape of a peripheral zone in the original image comprises the shape of the background region, which shape exists particularly at the peripheral region of said original image. It is determined whether or not the original image comprises the special document by detecting the peripheral zone. Further, the original image has an outer-frame region, having a predetermined shape at the peripheral region of the original image. The determination is carried out using a result of measuring the width of the outer-frame region. Further, the width of the outer-frame region comprises a width along a direction substantially perpendicular to a direction extending along the outline of the original image.
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Citations
2 Claims
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1. An original discrimination system for determining whether or not an original image is identical to a predetermined reference image, in response to data concerning said original image being input, duplication of said reference image being inadmissible, the determination comprising the steps of:
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a) removing extremely fine lines and isolated dots from the original image, b) determining whether in a predetermined area fine lines have been recognized in a number which exceeds a predetermined limit to be allocated to the original image;
c) interrupting the copying operation when the number equals or exceeds the predetermined limit, and continuing the copying operation when the number falls below the predetermined limit;
d) determining whether in the predetermined area fine lines are present with equal or unequal distance; and
e) interrupting the copy operation if the fine lines are recognized with unequal distance. - View Dependent Claims (2)
a1) scanning the original image as to density;
a2) allocating image data with a density below a threshold value to the extremely fine lines and removing or setting isolated dots at a density value of 0;
a3) setting image data with a density above the threshold value which are adjacent to image data with a high density to a high density.
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Specification