DirectX-based digital watermark generation method

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...

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 deploy, the present invention provides a digital watermark generation method based on the DirectX interface, which has a good anti-sneak photographing effect and is easy to use

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