Image enhancement using DCT-based matrix homomorphic filtering method
Su‐Ling Lee, Chien‐Cheng Tseng · 2016
In this paper, a digital image enhancement using discrete cosine transform (DCT) based matrix homomorphic filtering method is presented. First, the DCT is used to design matrix filter with prescribed ideal response. Because the closed-form solution is obtained, the filter coefficients are easily computed. Then, a digital image enhancement method is proposed by using matrix filter and homomorphic filtering. Finally, the enhancements of gray-level image and color image are used to show the effectiveness of the proposed DCT-based method.