We observed Sgr A* at 1.3 cm on 1992 November 8 with a 14 station VLBI array and, using data from 10 of these stations, obtained a high-dynamic range image with a beam of 3.35×1.7 milliarcseconds in position angle 14◦. The observed surface brightness distribution of Sgr A* is best modelled by an elliptically shaped gaussian component with parameter values: flux density 1.05 ± 0.10 Jy, major axi...

A compact overall design of a multispectral camera can be achieved by placing the bandpass filters between the lens and sensor. However, internal reflections between the sensor (or IR cut filter) and the optical filters may lead to weak duplicate images which impair the image quality. The duplicates called ghosting are especially noticeable near bright image regions and interfere with the surro...

While tone mapping operation of high dynamic range (HDR) images for realistic display is commonly researched, scientific visualization for analysing scene luminance within HDR image has much less attention from researches. This paper has presented and implemented an approach for the reproduction and visualization of the colour information in HDR images. We attempt several simple colour visualiz...

The dynamic range of a scene is the contrast ratio between its brightest and darkest parts Low dynamic range images usually represent pixels with pixel values ranging as integers between and High dynamic range pixels are capable of representing light quantities of one to a million and beyond and can express more exact than the usual dynamic range But it was di cult to model an object with high ...

We presented a survey on High-dynamic-range imaging (HDRI or HDR) is a set of methods used in the imagingand photography to reproduce a superior dynamic range of luminosity than regular digital imaging or photographic methods can do. HDR images can denote a superior range of the luminance levels than can be attained using the extra 'classical' techniques. Images such as those holding many actua...

In this paper, an efficient residue to binary converter design for the new high dynamic range moduli set {2-1,2+1,2,2+1,2-1} is presented. The reverse conversion in the four-moduli set {2, 2+1, 2+1, 2-1} has been proposed in literature. Hence, the converters are based on the new moduli set {2-1, (2-1)(2+1)(2+1)2} and propose its residue to binary converter using New Chinese Remainder Theorem 2 ...

Tone Mapping Operators (TMOs) compress High Dynamic Range (HDR) contents to address Low Dynamic Range (LDR) displays. While many solutions have been designed over the last decade, only few of them can cope with video sequences. Indeed, these TMOs tone map each frame of a video sequence separately, which results in temporal incoherency. Two main types of temporal incoherency are usually consider...