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As it often happens in cryptography, a visual cryptographic method serves as primitive for more evolved file encryption algorithm. During the development and evaluation process of the pixel sieve method, several weaknesses popped out. In the attempt of solving these weaknesses a possibility to transform the method from pixel based graphical cryptographic method to a bit based file cryptographic method...
This paper introduced a data embedding technology different from traditions. The study is based on visual C++ programming with interface. For convenience of users, It got over traditional defect of embedding technology. This study also produces new ideas in the aspect of precise correction. A more precise TIN-based method is assumed. Using this method, the errors of the corrected image is about one...
The rapid development of networks such as internet, intranet, wireless communication etc., and multimedia techniques has emphasized on the need for copyright protection, authentication and identification and secret sharing of information. Visual cryptography is a secret sharing scheme where a secret binary image (SI) is encoded into n shares of random binary patterns. If the shares are xeroxed onto...
We propose a robust background subtraction method for multi-view images, which is essential for realizing free viewpoint video where an accurate 3D model is required. Most of the conventional methods determine background using only visual information from a single camera image, and the precise silhouette cannot be obtained. Our method employs an approach of integrating multi-view images taken by multiple...
Lipreading is applied to synthesize speech for the speech-impaired people. To get a higher recognition result, data fusion with weighting coefficients at feature level is used to integrate the lip information from different kinds of lip features. Experiments are carried out based on HMM with different states and Gaussian mixture component in a small database for speaker-dependent case. Experiment...
In order to solve the faults in usual detection of droplet distribution and motion in pesticide application and agricultural spraying field, a new method is given for the analysis of droplets characteristics and motion with PDIA (Particle/Droplet Image Analysis) and digital image processing technique. The diode laser is an illumination system that provides pulses of infrared laser light with variable...
As Contourlet transform can give an asymptotic representation of edges and contours in image by virtue of its characteristics of multidirectional and flexible, it is introduced into the quality assessment of fused image. A new method (CSSIM) for image fusion quality assessment based on Contourlet and structural similarity of images is put forward in this paper. We introduce distortion channel to simulate...
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 adaptive image-based visual servo (IBVS) control for a quadrotor helicopter is proposed in this paper. By employing the adaptive gain in the IBVS control method, performance and stability of the under-actuated system are improved. The performance of the overall approach is validated by numerical and vision integrated hardware-in-the-loop-simulation (HILS) with the nonlinear quadrotor helicopter...
This paper introduces a method to generate music using a picture. We outline the transform system we created to do so. We analyze pictures as visual information, and music as acoustical information. We find they have features, such as continuity, in common. We create a transform system based these common features and output the music using MIDI (Musical Instrument Digital Interface). We consider the...
Previous proposed steganographic schemes based on tolerable error range (TER) can restrict the distortion caused by data hiding within an acceptable range, but both the stego-image and the original image are necessary for extracting the secret message. This paper presents a novel TER-based steganographic scheme, in which JPEG compression under a certain quality factor is regarded as TER, and the modification...
In video-fluoroscopic swallowing assessment the time taken for the bolus material to transit the oral and pharyngeal regions is currently estimated by visual inspection. This paper presents an effective method for objectively approximating these timings by fitting a Gaussian surface to the first derivative of the intensity profiles along user defined anatomical boundaries. The profile characteristics...
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...
With the increase of the number of the blind, demand for visual prosthesis is increasing. Text reading is one of the most important visual functions to the blind. Therefore human trials and simulations of prosthetic vision have already been carried out for testing an improved system or studying rehabilitation of people who implant prosthesis. But although forms of electrode arrays used in those studies...
When the traditional CANNY algorithm is applied for edge detection, thresholds are needed to filter candidate edge points after non-maximal suppression. But at present, thresholds are set by experience and the optimal choice is obtained by repeated tests and comparisons. In addition, the choice of current thresholds does not take characteristics of uneven lighting images into account. In some special...
The modeling of weathering effects in still images is a powerful editing tool for many graphics applications. Although most of these effects can be generated by manually creating textures through graphics editing applications, performing such artist work is time consuming. More sophisticated and automatic solutions to simulate a wide variety of weathering effects become essential. We present a method...
In order to ease the motion boundary in temporal-domain algorithms, the paper propose to utilize the luminance of macro-block(MB) around the lost MB, to obtain a more precise and dense motion vectors, the rational function be used in motion vector interpolation. Mutation points in the vector field are detected, as a combination of movement of the border, in the same way, the missing pieces of motion...
The advancement of information technology along with the proliferation of communication and multimedia, have increased the demand of digital contents. Video data of digital contents such as VOD (video on demand), NOD (news on demand), digital library, IPTV (Internet protocol television), and UCC (user created contents) are getting more permeated in various application fields. Video data have sequential...
In this paper, we propose adopts a fast but effective block-based segmentation method to extract the regions of interest. Distributing bit allocation methods depends on the region/content-based, which directly control bit allocation among different regions so as to achieve better visual quality in the regions of interest. Our algorithm can effectively enhance the perceptual quality for the regions...
Dzisiejsi użytkownicy internetu oczekują aby działające on-line, interaktywne publikacje kartograficzne prezentowały mapy o wysokiej jakości. Jedną z barier stosowania rastrowych map podkładowych w przeglądarkach GIS są ich duże rozmiary przy relatywnie małej prędkości transmisji. Artykuł analizuje przydatność kompresji obrazów dla hybrydowych publikacji kartograficznych. Porównuje się dotychczasowe...
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