Search

Hyperspectral data are a curse with huge dimensionality, high redundancy of spectral information, and are noisy in nature. Hundreds of narrow adjacent bands are present in HS (Hyperspectral) data with high spectral information and it always leads to a computational complexity in space and time. The information theoretic methods are used for hyperspectral band selection to avoid computational complexity. In order to address this issue, the new fusion of Mutual Information (MI) with Otsu (MI_Otsu) threshold method is proposed for hyperspectral band selection by employing three different entropy measures such as joint, conditional, and relative. The proposed approach identifies the probabilities, entropy, and mutual information between two hyperspectral bands. The optimal threshold is obtained using Otsu multi-threshold technique and highly informative bands will be selected. In addition, the SVM (Support Vector Machine) classification technique is adapted for further classification of selected bands to analyze the performance of the proposed algorithm. The experimental analysis is carried out using the real-time dataset from the test site ‘Indian Pines’ in Northwestern Indiana recorded by AVIRIS (Airborne Visible/Infrared Imaging Spectrometer) sensor that demonstrates the effectiveness of this proposed approach. It is proved that the proposed work shows the competitive performance even with less selected bands and the relative MI_Otsu method shows a higher accuracy of 92.16% with the comparison of joint and conditional MI_Otsu.

Introduction: Nonadherence and poor health care behaviors contribute to worsening of heart failure symptoms, in many cases leading to increased morbidity and mortality. Aim: To assess the efficacy of nurse-led cardiac rehabilitation on health care behaviours in adults with chronic heart failure. Method. An experimental design was conducted in India from January to December of 2019. A sample size of 200 adults with heart failure from a tertiary cardiac care center was enrolled. Participants were allocated into an intervention group (n = 100) and a control group (n = 100). A nurse-led cardiac rehabilitation program using a virtual educational video and reminder telephone calls was given to the intervention group for six months. A modified heart failure adherence and health care behaviours scale was used. Results: 78% of the adults in the intervention group and 79% of the adults in the control group were males. 43% of the adults in the intervention group and 32% of the adults in the control group had ≥2 years of chronic heart failure. 42.27% of the participants in the intervention group and 35.05% of the adults in the control group indicated that medical follow-ups were essential. 21.65% of the adults in the intervention group and 13.40% of the adults in the control group expressed no difficulty adhering to the sodium restriction in the posttest2. The participants in the intervention group had higher health care behaviours compared to control group, p