Performance evaluation of noise reduction algorithm with median filter using improved thresholding method in pixelated semiconductor gamma camera system: A numerical simulation study

COVID-19 CT image denoising algorithm based on adaptive threshold and optimized weighted median filter

“…The traditional extreme noise points judgment [24] , [25] , [26] , [27] can easily cause misdiagnosis of COVID-19 lesion signals. For the single threshold filtering method, the pixel whose value exceeds the preset threshold will be judged as noise [28] , [29] , [30] . Therefore, using a single threshold method may increase the probability of error detection for noise.…”