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| Auto White Balance Algorithm for Electric Endoscope Images Based on Local Color Temperature Estimation |
1 Key Laboratory of OptoElectronic Information Science and Technology of Ministry of Education，School of Precision Instrument and OptoElectronics Engineering, Tianjin University, Tianjin 300072, China
2 Department of Gastroenterology and Hepatology, Chinese PLA General Hospital, Beijing 100853, China |
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Abstract In the electronic endoscopic system, light source’s aging problem can lower color temperature and brightness of the images, which will affect the imaging quality seriously. To make up for the color temperature, auto whitebalance processing is required. By analyzing imaging characteristics, an algorithm model based on white patch theory is proposed. According to the spatial information of highlight spot, the local color temperature is established, by which way average chromaticity aberration correct factor increases from 903% to 7934% compared with classical algorithm. Subsample model is used to simplify the estimation of color temperature without losing image quality, and processing time is decreased by 5495%. The paper〖DK〗’s automatic white balance algorithm for electronicendoscope images can precisely restore color features for human tissues, and also inherits good realtime specialty.
〖KH2D〗
〖WTHZ〗Key words：〖WTBZ〗〖BP(〗┣┣（英）关键词┫┫〖BP)〗
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［1］陈冬青, 谢洪波. 医用电子内窥镜光源分色系统研究［J］. 天津大学学报（自然科学与工程技术版）, 2001, 34(2): 146-149.
［2］Gasparini F, Schettini R. Color correction for digital photographs［C］//Proceedings of the 12th International Conference on Image Analysis and Processing. Mantova: IEEE, 2003: 646-651.
［3］Single\|sensor imaging: methods and applications for digital cameras［M］. Boca Raton: CRC Press, 2012.
［4］王永刚, 王爱民. 舌象分析仪中舌色重现方法的研究［J］. 照明工程学报, 2001, 12(2): 4-10.
［5］许敏芬, 王立强, 袁波. 基于无色差表面识别的高清电子内窥镜自动白平衡算法［J］. 红外与激光工程, 2014, 43(9): 3110-3115.
［6］Chen Jing, WangLiqiang, Meng Zibo, et al. Color correction for high\|definition electronic endoscoe［J］. Journal of Innovative Optical Health Sciences, 2012, 5(04).
［7］刘勇, 高力, 宋春轶, 等. 影响内镜成-摄像法图像还原质量的因素分析［J］. 全科医学临床与教育, 2010, 8(5): 495-497.
［8］Nakano N, Nishimura R, Sai H, et al. Digital still camera system for megapixel CCD［J］. IEEE Transactions on Consumer Electronics, 1998, 44(3): 581-586.
［9］Gasparini F, Schettini R. Color balancing of digital photos using simple image statistics［J］. Pattern Recognition, 2004, 37(6): 1201-1217.
［10］Chen Chenglun, Lin Shaohua. Formulating and solving a class of optimization problems for highperformance gray world automatic white balance［J］. Applied Soft Computing, 2011, 11(1): 523-533. |
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