Abstract
With the popularity of smartphones, it is often easy to maliciously leak important information by taking pictures of the phone. Robust watermarking that can resist screen photography can achieve the protection of information. Since the screen photo process can cause some irreversible distortion, the currently available screen photo watermarks do not consider the image content well and the visual quality is not very high. Therefore, this paper proposes a new screen-photography robust watermark. In terms of embedding region selection, the intensity-based Scale-invariant feature transform (SIFT) algorithm used for the construction of feature regions based on the density of feature points, which can make it more focused on the key content of the image; in terms of embedding strength, the Just noticeable difference (JND) model is applied to limit the intensity of the watermark embedding according to the luminance and texture of the picture to balance robustness and invisibility; after embedding watermark, the coefficients in the neighborhood are again adjusted with optimal constraints to improve the accuracy of watermark extraction. After experiments, it is shown that the method we proposed can improve the correct rate of watermark extraction, the quality of the visual aspect of the watermarked picture is also improved.
Highlights
1 Introduction Currently, as smartphones become more popular and widely used, people can record some important information they need by taking photos with their phones
Select the feature region for embedding the watermark, find the feature points using intensity-based Scale-invariant feature transform (SIFT) algorithm and construct the feature region according to the density of the feature points
We found that the feature regions determined based on the feature point density can be more concentrated in key locations of the image, and such locations tend not to be cropped out
Summary
As smartphones become more popular and widely used, people can record some important information they need by taking photos with their phones. The images stored by taking photos can be copied, transmitted and restored, which will lead to leakage, malicious theft and illegal distribution of some important information, causing a series of security problems. In order to protect the image information in the screen from malicious leakage and to be able to track the source of leakage in time after the leakage, we can add a watermark to the picture. CMC, 2022, vol., no.3 picture and we can locate the source of the leak based on the watermark information to narrow down the scope of the investigation and protect important information
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