[1] We have successfully characterized the Clementine HIRES multispectral sensor entirely from inflight measurements. Relative calibration is obtained through dark subtraction (additive) and sensor spatial nonuniformity (multiplicative) on a pixel-by-pixel basis. Relative residuals from frame-to-frame are typically less than 1%. Absolute coefficients are obtained through comparisons with calibr...

We introduce halftoning as a general primitive for real-time non-photorealistic shading. It is capable of producing a variety of rendering styles, ranging from engraving with lighting-dependent line width to pen-and-ink style drawings using prioritized stroke textures. Since monitor resolution is limited we employ a smooth threshold function that provides stroke antialiasing. By applying the ha...

This study deals with the automatic interpretation of digital imagery and focuses on natural topographic objects, in particular vegetation. As a first step for developing a sound strategy combining pixel based and model based image analysis, we investigate the possibilities and limitations of pixel based methods in large scale applications. Throughout the paper we assume multispectral imagery a...

A stochastic gradient is formulated based on deterministic gradient augmented with Cauchy simulated annealing capable to reach a global minimum with a convergence speed significantly faster when simulated annealing is used alone. In order to solve space-time variant inverse problems known as blind source separation, a novel Helmholtz free energy contrast function, H 1⁄4 E T0S; with imposed ther...

In this paper we do a systematic investigation of continuous methods for pixel, line pixel and line dejittering. The basis for these investigations are the discrete line dejittering algorithm of Nikolova and the partial differential equation of Lenzen et al for pixel dejittering. To put these two different worlds in perspective we find infinite dimensional optimization algorithms linking to the...

Sensor gain and offset non-uniformities associated with the IRFPA is the prime factor in limiting the performance of an infrared system to a great extent. This technique is based upon the Kalman filter in which gain and offset non-uniformities are treated as random variable and filter parameters are updated on pixel-by-pixel basis in every frame. This algorithm is tested on actual infrared data...

This paper describesa regional geographical information system (GIS) for some Mediterranean benthic communities. The area covered by the GIS lies between the cities of La Ciotat and Giens in southeast France. The distinctive characteristics of this GIS compared with others usuallydescribed in the literature, are that all its layersdescribethe same theme but as seen at different moments with dif...

Interpolated rain-gauge data were compared to Meteosat-based precipitation estimates for sub-Saharan Africa. Validation was carried out using a dataset from a very dense gauge network in South Africa, on a point-to-pixel (PO–PI) as well as on a pixel-to-pixel (PI–PI) basis. Error criteria computed at the gauged pixels indicate that overall the interpolated estimates perform similarly to the sat...

In 22nm optical lithography and beyond, source mask optimization (SMO) becomes vital for the continuation of advanced ArF technology node development. The pixel-based method permits a large solution space, but involves a time-consuming optimization procedure because of the large number of pixel variables. In this paper, we introduce the Zernike polynomials as basis functions to represent the so...

Steganography is that method of activity in which a secret message among covered media is transmitted in such the way that anybody cannot apprehend the presence and/or contents of the hidden message. Once the data has been embedded, the cover media may be transferred through unsecured channels. The stego-image quality is improved by using the pixel swapping and parity based embedding method. In...