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In this paper, an efficient watermarking algorithm for color image is proposed based on HSI color space and Discrete Wavelet Transform (DWT). The color image is firstly converted from RGB to HSI format to obtain the intensity component. Then sub-blocks of intensity are divided and sorted according to the human visual system (HVS) characteristic. Finally, the scrambled binary watermark, which is achieved...
It is an important and challenging problem to tack variant-pose target, especially when the appearance of target changes during the period of occlusion. The traditional feature matching methods can not work well under the situations of target pose varying. This paper analyzes the characteristics of human visual tracking, and proposes a visual tracking model based on feature-imagination. Human tracking...
Pixel-value-differencing (PVD) based steganographic methods, which take into account the characteristic of human visual system, usually lead to large embedding capacity and good visual imperceptibility. In this paper, a recently proposed PVD-based steganography is further studied. First, by deriving a sufficient condition for data embedding/extraction, we show that the method can be generalized, and...
An active information display system offers human-centered service, which projects visual information according to human gaze. Proposed system is based on Intelligent Space, and uses a mobile robot with a projector. In this system, occlusion of visual information can be occurred by various reasons such as human, obstacles and so on. It is difficult to offer precise visual information, when the occlusion...
The functional behaviors of human standing postural control investigated when they were exposed to the long-term horizontal vibration in the sagittal plane. For complexity of human postural control, a useful alternative method which has been based on a black-box approach was taken, that is, where the feedback mechanism were lumped into a single element. The motor-driven support platform was designed...
Completely automated public turing tests to tell computers and humans apart (CAPTCHAs) are the automatic filters that are widely used these days to disallow any automated script that can perform the work of a human. CAPTCHAs are built in such a way that it is very difficult for any automated script to break them. In this paper, an approach to break text based CAPTCHAs has been proposed that first...
It is well known that the human visual system (HVS) cannot sense all changes in an image/video due to its underlying physiological and psychological mechanisms. We propose a complete masking estimation model for image/video in this paper. In our model, a very important mechanism of the HVS, visual attention, is incorporated to the existing just noticeable difference (JND) estimation models. A formula...
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