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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。
Color cameras are widely used in printing industry, image art, medical, environmental and other applications. On the premise of cost-saving, in order to ensure that the color rendering effect of the camera maintains a specific range, a method of using a single-pass pre-filter to correct the total spectral response curve of a color camera at the same time is proposed. The accuracy of prefilter simulation depends on the matching of Lucerne conditions. Due to limitations of filter materials, film design, manufacturing process, etc., it is impossible to fully meet the Luther condition. The single pass prefilter spectrum Matching will have greater technical difficulty. Based on the factors that affect the accuracy of the pre-filter simulation, a continuous and tunable uniform monochromatic illumination system was used to test the color CCD with high-precision relative spectral response. By selecting the appropriate evaluation function model, Rate simulation fitting, get the optimal spectral transmittance curve. Based on the 14 standard test colors recommended by the International Commission on Illumination (CIE), the theoretical color difference of the color camera before and after correction is calculated by using the CIE2000 color difference formula. The results showed that the average color difference decreased by 73% after the pre-filter was added, and the color rendering effect of the camera was significantly improved.