KR20020069326A - Visible Watermarking System Using Stereogram. - Google Patents

Abstract

PURPOSE: A visual watermarking method and system using stereogram are provided to hide a code image in a visual image such as printed image to easily authenticate the image. CONSTITUTION: Information about the original image is read using a computer. Similarity between the read image information and stereogram images is calculated, and the most similar stereogram image is selected from a database. A specific standard is fixed, and then the stereogram image is inserted into a portion of the original image, which meets the standard. The stererogram image is not inserted into a portion that does not meet the standard. A new image having the same size as the size of the original image is created, and the stererogram image is inserted into the new image.

Description

Visible Watermarking System Using Stereogram.

Digital watermarking technology is a technology that hides a certain form of information in a digital content such as video and music so that a third party cannot know. This technology has been developed for the purpose of copyright protection, and if ID information about the copyright holder is inserted in the content, it can be a powerful means to claim copyright infringement if used illegally. In addition, the use of electronic passwords is increasing in cases other than copyright protection. AHMIC, one of the Japanese health information centers, conducted an experiment in February 1998 to check the possibility of remote medical care using the Internet. In this experiment, digital watermark technology was used to protect the privacy of patients. The patient's personal information and various test result data are inserted into the X-ray image in the form of "electronic password" and transmitted to a remote doctor via the Internet. At this time, if the third party who does not have the key to decrypt the information sees the information, the information becomes unrecognizable and protects the privacy of the individual. Digital watermark technology can also be used for anti-counterfeiting purposes. No specific examples have yet appeared, but the most promising is the application to digital cameras. Set the electronic password to be inserted automatically when shooting video with a digital camera. If someone modifies the image at all, the electronic password disappears so that it can be determined whether there is no unit set. It can be used mainly when the images taken by accident insurance companies, such as accident vehicle shots and construction progress shots at construction sites, are used as conclusive evidence. It is known that Hitachi, NEC and IBM Japan are considering adopting the digital camera of this technology. The movement to use electronic password concealment technology is also in full swing in the copyright management of DVDs. Watermark technology can be classified into watermark embedding technique in spatial domain and watermark embedding technique in frequency domain. Among the two methods, marking technique in frequency domain is shown in Fig. 1. Passwords can be inserted in the frequency domain.

Using this technology, the non-oblivious method of inserting and extracting copyright authentication data such as trademarks, logos, seals, and handwritten signatures into content can be performed.

However, due to the large number of calculations generated during the transform process, real-time processing becomes difficult when applied to video. However, using a stereogram can reduce the number of calculations. Here's a look at stereograms. Stereogram is a term used in a paper published in the IEEE Computer Society, Volume 27, Number 10, in October 1994. The stereogram of the original image is scattered on a two-dimensional surface by applying the eye's visual difference. If you stare for a long time, it is a gram that is manipulated to show the original 3D image.

The watermarking in the frequency domain, which is the method described above, has a large number of calculations that occur in the transform process, which makes it difficult to process in real time when applied to a video. This is easy but can be difficult to apply to the printed image. In the present invention, a technique of inserting a visible watermark into an image so that even a printed image can be easily authenticated.

In addition, using this technology, if watermarks are written on the ground of the document to be printed in the form of a background image, and the designated paper is used, the uniqueness of the document is ensured, and documents that do not use the designated paper can be identified as false documents. Will be provided.

1 is a block diagram of embedding a watermark in an arbitrary image according to an embodiment of the present invention. [1] is an apparatus for analyzing an image set for an experiment. [6] is an image for inserting a watermark. System, [5] is the process of transmitting the data to extract the insertion area, [2] is the device to extract the insertion area from the original image, [7] is the device to make the stereogram according to the retrieved data, and [3] This process inserts a watermark into the insertion area. [4] is a watermarked image and [8] is an image for verification.

The present invention takes a visible form with a watermarking technique using the stereogram described above. The order for implementing the present invention is as follows.

1) Read information about the original image on a computer.

2) The similarity between the read image information and the image of the stereogram to be inserted is calculated and the most similar stereogram is found in the database.

3) After setting a certain standard, the stereogram image is inserted where it meets the criteria in the original image and the stereogram image is not inserted where it does not meet the criteria. Insert stereogram image.

An example of the images created in the above order is shown in FIG.

Among the watermark technology used to claim ownership by authenticating the uniqueness of the image, it is used as a technique to hide the image such as a password in the visible image such as the printed image and to show the hidden password when claiming so that the copy does not take the place of the original. . In addition, if a watermark is recorded on the page of the document to be printed in the form of a background picture to use a designated page, the uniqueness of the document is secured, and a document that does not use the designated page is provided as a false document. .

Claims (2)

If the watermark is visually embedded in the image watermark embedding method comprising the step of inserting the image converted into a stereogram in a predetermined region of the original image. An insertion region extraction apparatus used to find a region for inserting a stereogram among the predetermined regions presented in claim 1.