Multi-focus image fusion using quaternion wavelet transform

To avoid the introduction of false information during the fusion progress, a novel multi-focus image fusion method is proposed in quaternion wavelet transform domain. To obtain the dependency in different high frequency subbands, a quaternion wavelet contextual hidden Markov model (Q-CHMM) is established for modeling quaternion wavelet coefficients. And for better image representations, several features are proposed by analyzing the transform coefficients, phases of coefficients and the statistical attribution of coefficients. Different from the traditional fusion methods basing on a single feature, a comprehensive feature is constructed by using quaternion matrix to fuse the high frequency subbands. Experimental results demonstrate that the proposed method possess good fusion performance.