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Stereo display technologies have been widely used in various domains, such as 3D movies, 3D games, virtual reality (VR) and so on. Understanding human vision mechanisms is significant. When observers watch 3D images, their visual system utilizes massive cues to perceive depth. Chromostereopsis is one of significant cues. In this paper, authors studied the relationship between human depth perception...
Digital watermarking algorithms usually focus on texture masking due to the increasing noise insensitivity in texture regions. However, not all images have abundant texture regions. For images containing primarily edges and smooth regions, an image watermark should be embedded in edge areas. An adaptive edge-masking based on Total Variation (TV) decomposition for digital watermarking is proposed in...
Just noticeable depth difference (JNDD) model represents the depth sensitivity of human visual system (HVS). Human eyes have different depth sensitivity for different distance and binocular disparity information. The JNDD model indicates that human can easily perceive the depth change when an object is close to the screen plane, but less sensitive to a distant object. If the depth information is below...
Digital watermarking algorithms for stereo image and video have been simple extensions of monoscopic watermarking methods to two views, and have not considered the aspects of the human visual system which are particular to stereo perception. One key aspect is binocular suppression, which says that high quality image data (for example with sharp edges) presented to one eye can suppress low quality...
In the watermarking schemes, Just Noticeable Distortion (JND) model provides an efficient method to keep the balance between watermark's imperceptibility and robustness. Traditional JND models are not as perfect as they should be. Edge detection, which extracts content features well, improves the performance of JND models. In this paper we explore the reasons and simulate JND models based on edge...
In this paper, we study the effect of an entropy model in a watermarking system on two aspects: visual information measurement and united masking function. We propose a primal sketch based visual entropy model (short for PSVEM) for the watermarking system. The PSVEM is built on both image content analysis and hierarchical perception decomposition. Experimental results show that the digital watermarking...
Watermarking algorithms based on the Just Noticeable Distortion (JND) model show great superiority over other methods, in terms of the watermark imperceptibility and robustness. However, the existing wavelet-based JND models are based on global coefficients, without consideration of image content characteristics. Following the pixel-wise masking idea, a primal sketch based adaptive perceptual JND...
As a bridge of information communication and an important information source of emergencies, micro-blogging is also the soil for breeding false information. It is necessary to adopt technical methods to analyze the micro-blogging data for improving the healthy development. In this paper we introduce the features of micro-blogging, then propose an improved intelligence analysis system evaluating the...
Information entropy is often applied as one of masking effect in digital watermarking system. At present, some scholars have used entropy masking to improve the performance of their watermarking algorithm. This paper mainly introduces the entropy masking model in three different domains, and gives experiment report about utilizing spatial domain, DCT domain, and DWT domain entropy masking model in...
In this paper we discuss the essence of information transmission in digital watermarking system and the dissymmetric digital watermarking framework lived on media content communication. Then we propose a universal entropy masking model for watermarking embedding algorithm to keep the balance between watermarks' imperceptibility and its robustness. Also we conclude from the experiments that a suitable...
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