A novel spatial domain image enhancement algorithm, in which dynamic range of the scene illumination is compressed from the human visual perspective to improve the visual quality and visibility in digital images captured under degraded visual conditions, is proposed. The proposed algorithm employs an adaptive approach so that local image statics, namely the local standard deviation and the loca...

This paper investigates the interannual variability of January sea surface temperature (SST) in Amundsen Sea (AS) during period 1982–2022. SST Pine Island Bay (PIB) is found to exhibit most significant variation, with a standard deviation up 0.6°. Composite analysis indicates that, warmer years, at PIB approximately 1° higher on average than that cooler and its variation (cooler) years correspo...

This article presents the use of the synchrosqueezing transform (SST) for the timefrequency analysis of shock and vibration measurements. The time-frequency resolution properties of SST is demonstrated by analyzing acceleration measurements from pallets dropped from heights and vibration of pallets acquired in controlled laboratory settings. The article presents results that indicate that SST, ...

Abstract Recently, the synchrosqueezing transform (SST) was developed as an alternative to the empirical mode decomposition scheme to separate a non-stationary signal with time-varying amplitudes and instantaneous frequencies (IFs) into a superposition of frequency components that each have well-defined IFs. The continuous wavelet transform (CWT)-based SST sharpens the time-frequency representa...

Article history: Received 10 March 2008 Received in revised form 24 June 2008 Accepted 19 August 2008 Available online xxxx Two recent studies of observed sea surface temperature (SST) variations have provided striking evidence that their non-Gaussian statistics can be understood within the context of linear stochastically forced models in which the amplitude of the noise forcing depends linear...

The effects of subgrid cloud variability on grid-average microphysical rates and radiative fluxes are examined by use of long-term retrieval products at the Tropical West Pacific, Southern Great Plains, and North Slope of Alaska sites of the Department of Energy’s Atmospheric Radiation Measurement program. Four commonly used distribution functions, the truncated Gaussian, Gamma, lognormal, and ...

The Fengyun-4A (FY-4A) satellite is a new-generation geostationary meteorological developed by China. advanced geosynchronous radiation imager (AGRI), one of the key payloads onboard FY-4A, can monitor sea surface temperature (SST). This paper compares FY-4A/AGRI SST with in situ and Himawari-8/advanced Himawari (AHI) SST. study area spans 30°E–180°E, 60°S–60°N, period from January 2019 to Dece...

Color images can be treated as two-dimensional quaternion functions. For analysis of quaternion images, a joint space-wavenumber localized quaternion S transform (QS) is presented in this study for a simultaneous determination of the local color image spectra. The QS transform uses a two-dimensional Gaussian localizing window that scales with wavenumbers. Rotation invariance, invertibility and ...