An efficient fragile image watermarking technique for pixel level tamper detection and resistance is proposed. It uses five most significant bits of the pixels to generate watermark bits and embeds them in the three least significant bits. The proposed technique uses a logistic map and takes advantage of its sensitivity property to a small change in the initial condition. At the same time, it i...

One thousand volume holographic data pages, each containing 1x10(6)pixels , are stored in a common volume of LiNbO(3) :Fe by use of the 90 degrees geometry. An effective transverse aperture of 1.6 mm x 1.6mm , realized by repetition of this experiment at each of the eight surrounding locations, results in a demonstrated areal density of 394pixels/mum (2) (254 Gpixels/in. (2)) . Short-focal-leng...

Received Dec 11, 2014 Revised Feb 10, 2015 Accepted Feb 19, 2015 Most consumer digital cameras use a single image light sensor which provides color information using color filter array(CFA).This provided a mosaic images, in which each pixel position contains only one color component in case of Bayer CFA Pattern. This paper produced a CFA hierarchical prediction scheme based on context adaptive ...

52 Computer H as the rapid increase in available storage capacity fueled the demand for storage, or vice versa? It's hard to say: Computer users' hard disk drives are perpetually overflowing with data, even though a year earlier the same-size disk seemed more than sufficient. Research into and development of data storage devices is a race to keep up with this continuing demand for more capacity...

We design a linear-prediction-based multi-resolution approach for lossless image compression. The linear prediction technique computes the weighted differences between six neighboring pixel values to estimate the predicted pixel value. The prediction error is decomposed by a one-level integer wavelet transform to improve the prediction. The performance of the proposed approach is compared with ...

Let’s begin by briefly reviewing the Matlab routines required for VQ-based image compression. First, note that the VQ parameters are set on lines 13-19 of prob1.m. The general VQ framework is implemented by learnVQ.m, which uses the subroutine kmeans.m to implement the k-means algorithm. (Note that, as recommended, we use findnn.m and lpnorm.m within the k-means implementation to allow flexible...

Abstract Light field rendering is an image-based method that does not use 3D models but only images of the scene as input to render new views. approximation, represented a set images, suffers from so-called refocusing artifacts due different depth values pixels in scene. Without information about depths scene, proper focusing light limited single distance. The correct addressed this work and re...

range (six decades), the power consumption will be 71 mW. Normal operation produces events at a maximum of 4MHz, for a dynamic range of five decades, while consuming 10mW. A full VGA with three decades of dynamic range operates at 2.46MHz and consumes only 1.3mW. Fig. 4 shows how the output rate per pixel, dynamic range, power and array size scales. The main drawback to this approach is the com...