CAJ | 학술논문

基于数码相机的印刷品颜色质量检测首先面对的问题是颜色空间的设备相关性，解决这一问题的方法是进行数码相机的特征化，即将设备相关的RGB颜色值转换成设备无关的CIELab色度值。根据数码相机颜色空间的特性，提出基于多项式回归的子空间自适应补偿模型算法。该模型首先对RGB颜色空间进行划分，在每个子空间中建立多项式回归模型获得预测色度值及其转换精度，然后根据该转换精度与精度阈值间的关系确定是否需要对预测色度值作优化补偿处理。对于转换精度低于阈值的子空间，将其预测色度值与实测色度值的差值拟合为RGB颜色值的多项式函数，获得预测差值的多项式模型，并利用色度差值对其色度值进行补偿。实验表明，该方法能够有效补偿不同子空间颜色特性对转换精度的影响，大大提高了颜色空间转换的精度，满足颜色质量检测对颜色空间转换精度的要求。
기우수마상궤적인쇄품안색질량검측수선면대적문제시안색공간적설비상관성，해결저일문제적방법시진행수마상궤적특정화，즉장설비상관적RGB안색치전환성설비무관적CIELab색도치。근거수마상궤안색공간적특성，제출기우다항식회귀적자공간자괄응보상모형산법。해모형수선대RGB안색공간진행화분，재매개자공간중건립다항식회귀모형획득예측색도치급기전환정도，연후근거해전환정도여정도역치간적관계학정시부수요대예측색도치작우화보상처리。대우전환정도저우역치적자공간，장기예측색도치여실측색도치적차치의합위RGB안색치적다항식함수，획득예측차치적다항식모형，병이용색도차치대기색도치진행보상。실험표명，해방법능구유효보상불동자공간안색특성대전환정도적영향，대대제고료안색공간전환적정도，만족안색질량검측대안색공간전환정도적요구。
Device-dependent color space is the primary problem in digital camera based printed color quality detection. Camera colorimetric characterization is used to solve the problem, which transforms device-dependent RGB data of the camera to device-independent colorimetric CIELab values. According to the color space characteristic of digital camera, sub-space compensation model using adaptive polynomial regression is proposed. Firstly, RGB color space is divided into subspaces, and polynomial regression models are created in each subspace to predict the colorimetric values and their conversion accuracy. Then the compensation and optimization for the predicted colorimetric values is carried out according to the relationship between the conversion accuracy and the pre-set threshold. If the average conversion accuracy of one sub-space is lower than the threshold, a new polynomial function is created to describe the relationship between RGB data and the colorimetric errors of the predicted colorimetric value and the measured colorimetric value, and the predicted colorimetric values then are optimized with the calculated errors. Experiments show that the method can effectively compensate the influence of different subspace color characteristic on the conversion accuracy, which greatly improve the accuracy of the color space conversion, and meet the accuracy requirement of color space conversion in color quality detection.