A method and an apparatus thereof for enhancing a digital image. The method includes the steps of: capturing a pixel data block; determining a searching region and a reference window with the pixel data block serving as a center; dividing the searching region into compared windows each having a size equal to a size of the reference window; sequentially comparing the compared windows to the reference window to determine corresponding weighting values according to compared results; multiplying calculated blocks in the compared windows by the corresponding weighting values of the blocks to obtain weighted blocks; accumulating the weighted blocks to obtain a summed pixel data block; accumulating the weighting values to obtain a summed weighting value; and normalizing the summed pixel data block according to the summed weighting value to obtain an image-enhanced pixel data block.