The pre-processing step is integrated to enhance by reconstruction of an input image into the 4 frequency subbands through discrete wavelet transform (DWT) and un-sharp energy mask (UEM). A new segmentation algorithm is developed for detecting of four differential structures from CT scan images of lungs. Local Energy constraints (LEC) are integrated to Fuzzy c-means clustering algorithm to effectively find out the candidate regions for effectively initialization of variational level set (VLS) method.