In this paper, we describe a new adaptive vector quantization (AVQ) algorithm designed for the coding of nonstationary sources. This new algorithm, generalized threshold replenishment (GTR), diiers from prior AVQ algorithms in that it features an explicit, online consideration of both rate and distortion. Rate-distortion cost criteria are used in both the determination of nearest-neighbor codew...

This paper proposes a method for rendering scenes of both opaque and transparent objects. Transparency depends on the attenuation coefficient and the thickness of the transparent object we wish to render. To get the visible radiance, the volume rendering equation should be solved. Instead of marching a ray, we build a list that contains the intersection points of the ray and object surfaces. In...

In this summary, we describe a new adaptive vector quantization (AVQ) algorithm designed for the coding of nonstationary sources. This new algorithm, generalized threshold replenishment (GTR), di ers from prior AVQ algorithms in that it features an explicit, online consideration of both rate and distortion. Rate-distortion cost criteria are used in the determination of nearest-neighbor codeword...

In this paper, we propose a two-stage variable block-size multiresolution motion estimation (MRME) algorithm. In this algorithm, a method to reduce the amount of motion information is developed, and a bit allocation method minimizing the sum of the motion information and the prediction error is obtained in the wavelet transform domain. In the first stage of the proposed scheme, we utilize a set...

A technique that combines both logic and craft only can survive long. A multi-level security mechanism by blending steganogrpahy and visual cryptography is proposed here. Hiding already encrypted data inside an image is of immense value. Encryption is done by visual cryptography and hiding is done through the proposed de-noise Steganography With Selected Noise Bit Replacement Technique (SNBR). ...

This paper presents a steganographic scheme based on the RGB colour cover image. The secret message bits are embedded into each colour pixel sequentially by the pixel-value differencing (PVD) technique. PVD basically works on two consecutive non-overlapping components; as a result, the straightforward conventional PVD technique is not applicable to embed the secret message bits into a colour pi...

The data storage has been one of the bottlenecks in surveillance systems. conventional video compression schemes such as H.264 and H.265 do not fully utilize low information density characteristic video, they attach equal importance to foreground background when performing compression. In this article, we propose a novel scheme that compresses separately. ratio is greatly improved by sharing am...

Reversible data hiding (RDH) techniques recover the original cover image after extraction. Thus, they have gained popularity in e-healthcare, law forensics, and military applications. However, histogram shifting using a reversible embedding technique suffers from low capacity high variability. This work proposes which distribution obtained determines pixels that attain peak or zero distribution...