Two deep K-band (2.2 μm) images, with point-source detection limits of K = 25.2 mag (one sigma), taken with the Keck Telescope in subfields of the Hubble Deep Field, are presented and analyzed. A sample of objects to K = 24 mag is constructed and V606 − I814 and I814 −K colors are measured. By stacking visually selected objects, mean I814 −K colors can be measured to very faint levels; the mean...

We present a measurement of the surface brightness of the cosmic X-ray background (CXB) in the Chandra Deep Fields, after excluding all detected X-ray, optical and infrared sources. The work is motivated by a recent X-ray stacking analysis by Worsley and collaborators, which showed that galaxies detected by HST but not by Chandra may account for most of the unresolved CXB at E > 1 keV. We find ...

the human facial recognition is the base for all facial processing systems. in this work a basicmethod is presented for the reduction of detection time in fixed image with different color levels.the proposed method is the simplest approach in face spatial localization, since it doesn’trequire the dynamics of images and information of the color of skin in image background. inaddition, to do face...

Color visual cryptography (VC) is a secret sharing scheme which uses to encrypt a secret message into n halftone image shares. The users can recover the secret image by stacking their shares, and then secret image can be revealed. In extended visual cryptography, the share images are constructed to contain meaningful cover images. Halftoning and visual information pixel (VIP) is the important f...

A millimeter-sized artificial periodic structure material is successfully simulated, showing the characteristics of a thin geometric scale, broadband response, and high wave absorption. The structural units are stacked with metal circles, notched circular rings, dielectric material. design similar to quasi-two-dimensional planar maintains while reducing number layers in stack. In addition, elec...

Object-stacking is a model for structuring object based systems. The main feature of object-stacking is that layers of objects with a uniform interface are constructed, and the functions of these objects are integrated. The effectiveness of object-stacking has been shown for file systems of distributed operating systems. This paper presents the application of the object-stacking model to the Wo...

The activation energies associated with the formation of a superlattice intrinsic stacking fault (SISF) from an antiphase domain boundary (APB) and the formation of a superlattice extrinsic stacking fault (SESF) from a complex stacking fault (CSF) in g 0 phase of Ni-based superalloys are calculated using a microscopic phase field dislocation model in combination with the nudged elastic band (NE...