Apparatus and method for inlaying machine-readable watermark into picture

A technology of watermarking and photos, applied in computer parts, character and pattern recognition, photographic technology, etc., can solve problems such as inapplicability

Inactive Publication Date: 2006-09-27
HUNAN TONGSEN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But not suitable for ordinary photographic equipment "without built-in watermark software"

Method used

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  • Apparatus and method for inlaying machine-readable watermark into picture
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  • Apparatus and method for inlaying machine-readable watermark into picture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Embedding a machine-readable anti-counterfeiting mark into a photo

[0029] At least one lighting beam encoder 1 and one encoding background screen 4 are set up at the shooting site. The encoded background screen 4 is placed behind the photographed object, and the encoded watermark pattern 11 emitted by the encoder 1 is projected on the human body. Adopt natural light 2 and conventional photographic illumination light source 3, carry out photographing with conventional photographic equipment 5.

[0030] The self-made background coding screen 4 is to print (or project) the background coding watermark pattern 14 on a curtain-shaped (plate-shaped) support 15 . The background watermark pattern 14 allows multiple colors to be selected, and the color matching method is: the wavelength of the speckle used to hide the encoded information is less than 500nm or the wavelength is between 550nm and 600nm. The three-channel vision model divides a color image into three ...

Embodiment 2

[0038] Embodiment 2: Document printing and document authenticity inspection

[0039] combined with Figure 4 : photograph 16 by the method for embodiment 1, and photograph is printed on the certificate 20.

[0040] The certificate photo has the following special requirements for the anti-printing-scanning performance of the watermark:

[0041]Printing / scanning (PS: Printing, Scanning) process will inevitably cause image noise and distortion. Print / scan noise has the potential to overwhelm the original watermark in the image. Image gray value distortion and geometric distortion can lead to "watermark loss". The present invention is based on the principle of image frequency domain transformation (such as fractional Fourier transformation), and uses "image frequency domain coefficient partition / group transformation algorithms 23, 24 and 27" to embed and extract watermarks. It has been verified that the anti-printing-scanning performance of the algorithm is better than other p...

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Abstract

This invention relates to an apparatus and method for inlaying machine-readable watermark into picture. To embed an invisible false proof mark, with a special illuminating beam coder and coding background screen, embedding a random illuminated coded watermark pattern and background coded watermark pattern, as well as the (1) object shape, (2) character and false proof mark, and (3) self-defined mark of the shooting field, all into the photo in the exposing moment based on the optical synthesis principle. To check the mark, converting the photo into a digital image by a photo-electric device, and using the machine-read device to extract the watermark and hidden information with the key for decision. This invention provides technical guarantee to opposite department.

Description

technical field [0001] The invention relates to a method and a device for adding watermarks to photos at the shooting site and at the moment of exposure. Background technique [0002] The popularity of photographic equipment and the out-of-control use of color copying / color light printing equipment have brought opportunities for criminals who forge and tamper with certificate photos. The challenge that the issuing agency faces is that it is difficult (to the point that it is impossible) to prevent criminals from using advanced photography and color copying technology to carry out document counterfeiting activities. At present, digital watermarking technology has been used to hide information in the portrait of the certificate. There are three existing methods for embedding watermarks in photos: (1) embedding watermarks on films by means of pre-exposure, as disclosed in Chinese Patent CN200410005339. A monochromatic light source is used to pre-expos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03C11/02G06T1/00H04N1/00G06K9/00
Inventor 谭吉春唐新怀贾辉周扑王晓峰郭宏瑞刘莉张丽强
Owner HUNAN TONGSEN TECH
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