Image processing apparatus and method, program and readable memory medium for computer

Abstract

The invention provides an image processing apparatus and a method therefor capable of registering a paper fingerprint at a position that considers a matching accuracy and security. The image forming apparatus executes: a paper fingerprint acquisition step of reading a paper fingerprint (S1101-S1104); a paper fingerprint registration determination step of determining whether paper fingerprint information acquired in the paper fingerprint information acquisition step is suitable as a paper fingerprint for paper (51105-51107) ; and a paper fingerprint registration step of registering a paper fingerprint detected in the paper fingerprint registration determination step as a paper fingerprint for the paper (s803).

Description

technical field [0001] The present invention relates to an image processing device and an image processing method, and more particularly, to an image processing device capable of processing information of paper fibers, so-called paper fingerprint information, an image processing method, a program, and a recording medium thereof. Background technique [0002] Conventionally, there is a technique of embedding auxiliary data such as a model number in image data in order to trace and investigate forged copies of documents in digital multifunctional machines. In addition, in the process of embedding auxiliary data, there is a technique of embedding auxiliary data in a position that is difficult to be found by a third party when embedding processing is performed in order to prevent a third party from easily finding and decoding the auxiliary data from a printed image . For example, Japanese Patent Application Laid-Open No. 2004-214831 discloses this technique. [0003] In additi...

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Problems solved by technology

[0006] However, the technique disclosed in Japanese Patent Application Laid-Open No. 2004-214831 embeds auxiliary data for tracking and investigating counterfeit copying into an image portion of a paper form, making it difficult to find the auxiliary data

This technique has the effect of making it difficult to falsify auxiliary data, but has the following problem: if the auxiliary data embedded in the image part is hidden due to cutting and pasting, forgery can be performed

Therefore, in the case where a desired messy part is not generated or otherwise, there arises a problem that the originality can no longer be guaranteed

[0008] In addition, the technique disclosed in Japanese Patent Application Laid-Open No. 2004-112644 is a technique for determining a reading area using a mark added to a used paper form as a reference, but this technique does not consider whether the area is a paper fingerprint area. suitable area

Therefore, there is a problem that this technique judges an area that cannot be read correctly, such as a solid black area, as a read area.

[0009] In addition, the technique disclosed in Japanese Patent Application Laid-Open No. 2001-127983 is a technique of obtaining the average concentration of a predetermined area and determining the area in which the added data is embedded, but this technique does not consider the collation rate after changing the area

Therefore, in the case where an area with a low contrast ratio such as a completely black area extends near a predetermined area, there is a problem that even when the area is changed according to the average density, additional data may be embedded in the area where the paper fingerprint cannot be read correctly. in the area

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