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In this paper, a novel data hiding scheme, 3D unseen visible watermarking (UVW) based on depth no-synthesis-error (D-NOSE) model is proposed. The proposed method has the ability to detect which region of a depth map is suitable for watermark embedding and calculate optimal variation of pixel values for watermarking. The watermark is embedded into the suitable region by modifying the depth map with...
Depth from Defocus (DFD) is known as the technology which is able to estimate depth in the scene by a monocular camera without any additive devices. Using this advantage of DFD, we improved the speed of Auto Focus (AF). To apply DFD to AF, it is necessary to capture 2 images that have a small amount of “difference in focal positions” (we call DiFP). In this paper, we show the performance of the depth...
The authors propose a robust watermark method to cope with the situation when double attacks simultaneously occur. Under a JPEG compression attack and cropping attack whose arbitrary positions to be attacked are assumed. Experiments with a heavy JPEG compression rate of 1/33 show a satisfactory detection ratio of 99.9%.
The GrabCut, which uses the graph-cut iteratively, is popularly used as an interactive image segmentation method since it can produce the globally optimal result. However, since the initialization of the GrabCut is roughly performed by the manual interaction, the accuracy of the segmentation result is not guaranteed when the user defines an inaccurate guide. To solve this problem, in this paper, we...
Digital watermarking is a process of embedding watermark signal with its host image to prove its authenticity. In this paper, Embedding and extraction process are applied on the higher frequency domain of Discrete Wavelet Transform (DWT). Using DWT prior to the Discrete Cosine Transform (DCT) provides improved imperceptibility and higher robustness against Signal processing attacks. Arnold transformation...
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