[1] Fraz M M, Remagnino P, Hoppe A, et al. Blood vessel segmen-tation methodologies in retinal images–a survey[J]. Computer Methods and Programs in Biomedicine, 2012, 108(1): 407–433.

[2] and Programs in Biomedicine, 2014, 116(3): 215–225.

    Yang S F, Cheng C H. Fast computation of Hessian-based enhancement filters for medical images[J]. Computer Methods

[3] Oh J, Hwang H. Feature enhancement of medical images using morphology-based homomorphic filter and differential evolution algorithm[J]. International Journal of Control, Automation and Systems, 2010, 8(4): 857–861.

[4] Yin X X, Ng B WH, He J, et al. Accurate image analysis of the retina using Hessian matrix and binarisation of thresholded en-tropy with application of texture mapping[J]. PLoS One, 2014, 9(4): e95943.

[5] Ajam A, Aziz A A, Asirvadam V S, et al. Cerebral vessel en-hancement using bilateral and Hessian-based fil-ter[C]//Proceedings of 2016 6th International Conference on In-telligent and Advanced Systems (ICIAS), 2016.

[6] Kakushima N, Yoshida M, Yamaguchi Y, et al. Magnified en-doscopy with narrow-band imaging for the differential diagnosis of superficial non-ampullary duodenal epithelial tumors[J]. Scandinavian Journal of Gastroenterology, 2019, 54(1): 128–134.

[7] Osawa H, Yamamoto H. Present and future status of flexible spectral imaging color enhancement and blue laser imaging technology[J]. Digestive Endoscopy, 2014, 26(S1): 105–115.

[8] Kodashima S, Fujishiro M. Novel image-enhanced endoscopy with i-scan technology[J]. World Journal of Gastroenterology, 2010, 16(9): 1043–1049.

[9] Jiang H P, Zhang K J, Yuan B, et al. A vascular enhancement algorithm for endoscope image[J]. Opto-Electronic Engineering, 2019, 46(1): 28–36. 姜鸿鹏, 章科建, 袁波, 等. 一种血管内窥镜图像增强算法 [J]. 光电工程, 2019, 46(1): 28–36.

[10] Hebden J C, Varela M, Magazov S, et al. Diffuse optical imaging of the newborn infant brain[C]//Proceedings of 2012 9th IEEE International Symposium on Biomedical Imaging, 2012: 503–505.

[11] Preece S J, Claridge E. Monte Carlo modelling of the spectral reflectance of the human eye[J]. Physics in Medicine & Biology, 2002, 47(16): 2863–2877.

[12] Robles F E, Chowdhury S, Wax A. Assessing hemoglobin con-centration using spectroscopic optical coherence tomography for feasibility of tissue diagnostics[J]. Biomedical Optics Express, 2010, 1(1): 310–317.

[13] Zhang H, Cao X G, Xie F Y. Digital Image Processing and Anal-ysis[M]. 2nd ed. Beijing: Mechanical Industry Press, 2013. 张弘, 曹晓光 , 谢凤英 . 数字图像处理与分析 [M]. 2版. 北京: 机械工业出版社, 2013.

[14] Coriat R, Chryssostalis A, Zeitoun J D, et al. Computed virtual chromoendoscopy system (FICE): a new tool for upper endos-copy?[J]. Gastroentérologie Clinique et Biologique, 2008, 32(4): 363–369.

[15] Kamphuis G M, de Bruin D M, Fallert J, et al. Storz professional image enhancement system: a new technique to improve en-doscopic bladder imaging[J]. Journal of Cancer Science & Therapy, 2016, 8(3): 71–77.

[16] Xu Z Y, Liu X M, Ji N. Fog removal from color images using contrast limited adaptive histogram equalization[C]//Proceedings of 2009 2nd International Congress on Image and Signal Processing, 2009.

[17] Zhang Y, Wang H M, Zhou R Z, et al. A improved infrared image noise reduction algorithm and FPGA implement[J]. Fire Control & Command Control, 2017, 42(6): 167–170, 174.张勇, 王和明 , 周瑞钊 , 等. 一种改进的红外图像降噪算法与 FPGA实现[J].火力与指挥控制, 2017, 42(6): 167–170, 174.