| THEMIS紫外光谱成像仪的放大率估计及其图像的长宽比校正 |
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| 引用本文： | 郭晶晶,许小京,黎智辉,刘芳. THEMIS紫外光谱成像仪的放大率估计及其图像的长宽比校正[J]. 刑事技术, 2014, 0(1): 37-39 |
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| 作者姓名： | 郭晶晶 许小京 黎智辉 刘芳 |
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| 作者单位： | [1]公安部物证鉴定中心,北京100038 [2]中国人民公安大学研究生部,北京100038 |
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| 基金项目： | 公安部物证鉴定中心基本科研业务费（NO.2012JB009）国家科技支撑计划课题（NO.2012BAK02B04） |
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| 摘 要： | 目的 校正THEMIS紫外光谱成像仪图像的长宽比并估计系统放大率参数.方法 制作测试图片,用紫外光谱成像仪拍摄紫外光谱影像集,由图像和测试图片的差异分析出成像缺陷和放大率参数.结果 通过Photoshop测量像素值的方法测量出图像的长宽比差异,并用MATLAB算法校正,同时得出紫外光谱成像仪的放大倍率β.结论 校正后紫外光谱图像恢复了原始比例,且系统放大率β可以在恢复痕迹原始大小时发挥作用,由此获得准确的紫外光谱图像供后续光谱分析检验和研究.
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| 关 键 词： | 紫外光谱成像仪 长宽比校正 放大率估计 |
Extrapolation of magnification factor of THEMIS UV spectral imaging system and correction of its images aspect ratio |
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| Affiliation: | GUO Jing-jing, XU Xiao-jing, LI Zhi-hui, et al (Institute of Forensic Science, Ministry of Public Security, Beijing 100038, China) |
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| Abstract: | Objective To establish a method for correcting images aspect ratio of the THEMIS UV spectral imaging sys- tem and obtain the parameterβof the system. Methods Test pictures made with Adobe Photoshop were analyzed by THEMIS UV spectral imaging system. The difference of aspect ratio of images were measured and corrected with MATLAB. Results Based on differences between test pictures and images, the imaging defects and the parameterβwere obtained. Conclusion UV spectral im- age can be recovered to the original aspect ratio and the parameterl3can be used for recovering the original size of objects. |
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| Keywords: | UV spectral imaging system images aspect ratio correction extrapolation of magnification factor |
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