DirectX-based digital watermark generation method

A technology of digital watermarking and embedded watermarking, applied in the direction of program/content distribution protection, etc., can solve the problems of complex, digital watermark candid photography deployment, etc., and achieve the effect of improving the operation speed

Pending Publication Date: 2019-09-27
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: In order to overcome the shortcomings of existing digital watermarks that are easy to be secretly photographed and complicated to dep...

Method used

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  • DirectX-based digital watermark generation method
  • DirectX-based digital watermark generation method

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Embodiment Construction

[0023] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings. It should be understood that the embodiments provided below are only intended to disclose the present invention in detail and completely, and fully convey the technical concept of the present invention to those skilled in the art. The present invention can also be implemented in many different forms, and does not Limited to the embodiments described herein. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention.

[0024] The present invention creates a top window with a certain transparency on Windows, puts the watermark pattern to be embedded into the window through a high refresh rate, and ensures that the watermarks before and after are complementary in color at all times, so that the watermark content does not affect the human eye. Normal viewing, but there will be a watermark on the illegally c...

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Abstract

The invention provides a DirectX-based digital watermark generation method. The method comprises the following steps of: creating a top window; adjusting transparency; performing color selection; embedding a watermark pattern. According to the method, by analyzing different imaging principles of human eyes and a mobile phone camera, pictures with a color complementary relationship are refreshed on a screen at a high frame rate, so that the digital watermark can be captured by the mobile phone camera while not being perceived by the human eyes. The invention aims to lighten the weight and reduce the adjustment complexity in the use process. An application program which is used on a Windows platform and is based on a DirectX interface is developed. A window with a certain transparency is drawn on the topmost layer of a screen by the program; the method comprises the steps that firstly, embedded information is displayed in a window, then the color and transparency of the embedded information are adjusted according to actual conditions, pictures with complementary colors of the embedded information are circularly displayed in the window, finally, the embedded watermark patterns are added to the top layer of the electronic screen in real time, and the embedded watermark patterns are invisible to human eyes through a high-speed refreshing method.

Description

technical field [0001] The invention relates to application program development based on Windows, the field of visible light communication based on a screen-camera and digital watermark technology, in particular to a method for generating a digital watermark. Background technique [0002] When the human eye sees external objects, the external objects either emit light or reflect light, and then the light passes through the pupil and is refracted by the lens and converges on the retina, which is analyzed by the cone cells sensitive to color and the rod cells sensitive to light and shade. When the external color reaches the human eye at a speed higher than the critical flicker frequency, what the human eye observes is the fusion value of all colors during this period. Generally, mobile devices are equipped with a rolling shutter, and the content of a picture taken is not at the same time, so when shooting high frame rate content or moving objects, there will be a "jelly effect...

Claims

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Application Information

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IPC IPC(8): G06F21/16
CPCG06F21/16
Inventor 李文中陈旭詹同陆桑璐
Owner NANJING UNIV
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