Adaptive filtering; Biological organs; Classification (of information); Equalizers; Extraction; Feature extraction; Generative adversarial networks; Graphic methods; Image enhancement; MATLAB; Support vector machines; Adaptive histograms; Chest X-ray image; Contrast limited adaptive histogram equalization filtering scheme; Disease detection; Empirical wavelet transform; Filtering schemes; Histogram equalizations; Lung disease detection; Optimization algorithms; Self-attention generative adversarial capsule network; Sun flower optimization algorithm; Wavelets transform; Article; classifier; contrast limited adaptive histogram equalization; convolutional neural network; coronavirus disease 2019; deep belief network; diagnostic accuracy; histogram; human; image quality; information processing; lung disease; lung nodule; mammography; methodology; nonhuman; predictive value; self attention generative adversarial capsule network; sensitivity and specificity; signal processing; simulation; thorax radiography; wavelet transform; Wavelet transforms; Chests X-ray images