[1] KROTKOV E. Focusing[J]. International Journal of Computer Vision, 1987, 1(3):223-237. [2] SUBBARAO M, CHOI T S, NIKZAD A. Focusing techniques[J]. Optical Engineering, 1992, 32(11):2824. [3] SUBBARAO M, TYAN J. Selecting the optimal focus measure for autofocusing and depth-from-focus[J]. IEEE Transactions on Pattern Analysis and Machine Intelligence, 1998, 20(8):864-870. [4] WEE C, PARAMESRAN R. Image sharpness measure using eigenvalues[J]. Information Sciences, 2007, 177(12):2533-2552. [5] KAUTSKY J, FLUSSER J, ZITOVA B, et al. A new wavelet-based measure of image focus[J]. Pattern Recognition Letters, 2002, 23(14):1785-1794. [6] TIAN J, CHEN L. Adaptive multi-focus image fusion using a wavelet-based statistical sharpness measure[J]. Signal Processing, 2012, 92(9):2137-2146. [7] LIU Y, JIN J, WANG Q, et al. Phases measure of image sharpness based on quaternion wavelet[J]. Pattern Recognition Letters, 2013, 34(9):1063-1070. [8] 周厚奎,葛品森,冯海林.基于非下采样Contourlet变换的显微图像清晰度评价算法[J].合肥工业大学学报(自然科学版),2014,37(10):1204-1209.(ZHOU H K, GE P S, FENG H L. Micro-image definition evaluation algorithm based on non-subsampled Contourlet transform[J]. Journal of Hefei University of Technology (Natural Science), 2014, 37(10):1204-1209.) [9] 高直,朱志浩,徐永红,等.基于四元数小波变换及多分形特征的纹理分类[J].计算机应用,2012,32(3):773-776.(GAO Z, ZHU Z H, XU Y H, et al. Texture classification based on quaternion wavelet transform and multifractal characteristics[J]. Journal of Computer Applications, 2012, 32(3):773-776.) [10] 徐永红,赵艳茹,洪文学,等.基于四元数小波幅值相位表示及分块投票策略的人脸识别方法[J].计算机应用研究,2010,27(10):3991-3994.(XU Y H, ZHAO Y R, HONG W X, et al. Face recognition method based on quaternion wavelet magnitude/phase representation and block voting strategy[J], Application Research of Computers, 2010, 27(10):3991-3994.) [11] 殷明,刘卫.基于四元数小波变换HMT模型的图像去噪[J].计算机工程,2012,38(5):213-215.(YIN M, LIU W. Image denoising based on HMT model of quaternion wavelet transform[J]. Computer Engineering, 2012, 38(5):213-215.) [12] BAYRO-CORROCHANO E. The theory and use of the quaternion wavelet transform[J]. Journal of Mathematical Imaging and Vision, 2006, 24(1):19-35. [13] 殷明.四元数小波变换理论及其在图像处理中的应用研究[D].合肥工业大学,2012:57-59.(YIN M. Quaternion wavelet transform theory and its application in image processing[D]. Hefei:Hefei University of Technology, 2012:57-59.) [14] GINZBERG P, WALDEN A T. Matrix-valued and quaternion wavelets[J]. IEEE Transactions on Signal Processing, 2013,61(6):1357-1367. [15] SOULARD R, CARRÉ P. Quaternionic wavelets for texture classification[J]. Pattern Recognition Letters, 2011, 32(13):1669-1678. [16] WAI L C, HYEOKHO C. Coherent multiscale image processing using dual-tree quaternion wavelets[J]. IEEE Transactions on Image Processing, 2008,17(7):1069-1082. [17] HUANG W, JING Z. Evaluation of focus measures in multi-focus image fusion[J]. Pattern Recognition Letters, 2007, 28(4):493-500. |