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This research work proposes an image analysis‐based algorithm to enhance the time–frequency (T –F) mask obtained in the initial segmentation of CASA‐based monaural speech separation system to improve speech quality and intelligibility. It consists of labelling the initial segmentation mask, boundary extraction, active pixel detection and eliminating the non‐active pixels related to noise. In labelling, the T –F mask obtained is labelled as periodicity pixel (P) matrix and non‐periodicity pixel (NP) matrix. Next speech boundaries are created by connecting all the possible nearby P and NP matrix. Some speech boundary may include noisy T –F units as holes; these holes are treated using the proposed algorithm. The proposed algorithm is evaluated with the quality and intelligibility measures such as signal to noise ratio (SNR), perceptual evaluation of speech quality, , , coherence speech intelligibility index (CSII …