基于单元多项式回归法的扫描仪色彩校正研究

Study on Correction Unit Polynomial Regression Method Based on Color Scanner

针对IT8.7/2色靶及自定义色靶,采用单元多项式回归法,进行扫描仪RGB到Lab颜色空间的转换,以实现扫描仪的色彩校正。结果表明:针对IT8.7/2色靶,当采用5级均等分割中心点并采用13项50点进行多项式回归时,精度相对较高,效果较好;针对自定义色靶,当采用8级均等分割中心点并采用19项180点进行单元多项式回归时,精度相对较高,效果较好。采用单元多项式回归法,可提升扫描仪RGB到Lab颜色空间的转换精度,并节约计算时间,能有效实现扫描仪的色彩校正,且处理过程更简便、直观。

For IT8.7/2 color target and custom color target, scanner RGB color space was converted to Lab color space to achieve the scanner color correction by using unit polynomial regression. The results showed that： for the IT8.7/2 color target, when the level 5 equal split center point was adopted with 13 item 50 point polynomial regression, better accuracy and effects were achieved; for custom color target, when the level 8 equal split center point was adopted with 19 item 180 unit polynomial regression, better accuracy and effects were accomplished. The unit polynomial regression could improve the scanner space conversion accuracy from RGB color space to Lab color with the shortening of the computing time. It could effectively realize the scanner color correction while the treatment process was more intuitive and simple.