| A data augmentation method for expanding a dataset including a plurality of spectrograms is provided. The method includes selecting at least one patch of a first spectrogram of the plurality of spectrograms, determining at least one adjustment value corresponding to the at least one patch, and adjusting the at least one patch of the first spectrogram based on the at least one adjustment value, to obtain a first adjusted spectrogram. The at least one adjustment value includes at least one of a contrast adjustment value, a brightness adjustment value, and a gamma adjustment value. |