We discuss considerations for preparing observations using spatial scans with WFC3 for two categories of intended reader: 1) the general observer preparing an observation, and 2) a contact scientist reviewing a phase 2 proposal. Coincidentally and conveniently, the IR spectroscopic Exposure Time Calculator’s “brightest pixel” value in electrons accurately predicts (within 5%) the peak value of ...

In this paper, we shall propose a lossless image compression method, in which we compress an image by saving the differences between the encoding pixels and their adjacent pixels. To deal with a pixel, we refer to not only its up pixel but also its left pixel and replace the value of the pixel itself with the value of difference. The experimental results show that the method gives quite an impr...

A line extraction method based on image carving is presented in this paper. The gradient magnitude of a pixel is taken as the point-importance of the pixel. The length of the line where the pixel lies, is considered as the lineimportance of the pixel. Iteratively, those pixels, whose point-importance value is less than an updated pointimportance threshold and whose line-importance value is less...

Interferometric Synthetic Aperture Radar (InSAR) techniques have been recognised as an ideal tool for many ground deformation monitoring applications. However, the spatially and temporally variable delay of the radar signal propagating through the atmosphere is a major limitation to accuracy. The dominant factor to be considered is the tropospheric heterogeneity, which can lead to misinterpreta...

Radiometric normalization is critical for multi-spectral image change detection. In this paper, a histogram matching method is proposed to perform relative radiometric normalization among heterogeneously sensed images. To quantify the histogram matching quality, which is reference image and band dependent, the image differencing based quantitative measure, such as Euclidean or Manhattan distanc...

Two variations of image differencing were compared. The first was based on unsupervised classification, repeated five times, using five sequential date-pairs of difference images between 1972 and 1993. Referred to as merged image differencing, this method required merging the results from five separate time intervals into a single map of forest harvest activity. The other method involved a sing...

Changes in diffuse ultrasonic signals recorded from permanently mounted sensors can be correlated to initiation and growth of structural damage, offering hope that sparse sensor arrays can be utilized for monitoring large areas. It is well-known that benign environmental changes also have significant effects on diffuse ultrasonic signals that are of comparable magnitude to the effects of damage...