利用单通道预滤光片提高彩色相机显色能力的方法

发布时间：2018-03-12 09:01

本文选题：视觉光学　切入点：彩色相机　出处：《红外与激光工程》2016年08期 　论文类型：期刊论文

【摘要】：彩色相机广泛应用于印刷工业、形象艺术、医疗、环境等多个应用领域。在节约成本的前提下,为了保证相机显色效果维持特定范围,提出了利用单通道预滤光片同时对彩色相机总光谱响应曲线进行校正的方法。预滤光片模拟准确度取决于卢瑟条件的匹配程度,由于滤光片材质、膜层设计、制造工艺水平等的限制,完全符合卢瑟条件是不可能的,单通道预滤光片光谱匹配则会有更大的技术难度。从影响预滤光片模拟准确度的因素出发,采用连续可调谐均匀单色照明光源系统对彩色CCD进行高精度相对光谱响应测试,通过选取合适的评价函数模型,对预滤光片光谱透过率进行仿真拟合,得到最优光谱透过率曲线。以国际照明委员会(CIE)推荐的14种标准测试颜色为参考,采用CIE2000色差公式,对校正前后彩色相机进行理论色差计算。结果表明:增加预滤光片后,平均色差降低73%,相机显色效果得到显著提升。
[Abstract]:Color cameras are widely used in the printing industry, image art, medical treatment, environment and other applications. Under the premise of cost savings, in order to ensure that the camera color effect to maintain a specific range, A method for correcting the total spectral response curve of color camera using single channel prefilter is proposed. The simulation accuracy of the filter depends on the matching degree of Luthor condition, and the film layer is designed because of the material of the filter. It is impossible to meet the Luthor condition due to the limitation of manufacturing process level, and it will be more difficult to match the spectrum of single-channel pre-filter. Starting from the factors that affect the simulation accuracy of pre-filter, A continuous tunable uniform monochromatic illumination system is used to test the relative spectral response of color CCD with high precision. The spectral transmittance of the pre-filter is simulated by selecting a suitable evaluation function model. The optimal spectral transmittance curve is obtained. With the reference of 14 standard test colors recommended by the International Lighting Commission (IIA), the theoretical chromatic aberration of color cameras before and after correction is calculated by using CIE2000 color difference formula. The results show that: after adding pre-filter, The average color difference is reduced by 73 and the color effect of the camera is improved significantly.
【作者单位】：中国科学院安徽光学精密机械研究所通用光学定标与表征实验室;
【基金】：国家自然科学基金(41405037)
【分类号】：TB852.1

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