基于多项式回归逼近的LED显示色域变换技术研究
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摘要
对LED显示屏校正前要进行XYZ色度参数采集，现有的色度采集设备包括两种，点采集设备和面采集设备，点采集设备价格便宜，操作简单，但是不能海量采集，面采集设备可以海量采集，但是价格昂贵，现场不易操作。LED领域常用的采集设备之一是彩色CCD原型机，但只能采集到LED像素的RGB色域数据，其光谱响应与人的视觉有一定差异，需要转换成一个与设备无关的XYZ色域空间，本文提出一种基于多项式回归逼近方法的LED显示色域转换技术，利用该技术可以使彩色CCD原型机采集到的RGB数据转换成CIE标准XYZ色域数据，从而完成色度采集，该色度采集方法成本低，操作简单，可以完成大面积的色度采集，兼顾了点采集设备和面采集设备的优点，是一种方便有效的色度采集方法。
全文主要由三部分组成：
首先，介绍了色域转换样本数据提取的相关内容，其中包括：彩色CCD原型机的曲面修正、噪声去除、样本LED点的定位、识别、RGB数据及XYZ色域数据的提取，为色域转换提供数据。
其次，利用多项式回归逼近法对CCD原型机采集到的RGB数据进行转换。先利用光谱分析法分析CCD原型机的光谱函数曲线、LED的光谱曲线和CIE1931三刺激函数曲线的关系，转换矩阵的特性化收束因子由此得出，然后利用目标色分析法中的多项式法，把样本LED像素点的RGB值和XYZ值代入，找到拟合最佳的情况下的多项式系数，求出最小误差，从而找到CCD原型机采集到的RGB数据转换成XYZ色域数据的红绿蓝转换矩阵。
最后，为验证转换的正确性，给出色差和校正前后的图片对比，并把多项式回归逼近法与神经网络法和查表法进行对比，验证该方法的精确性及有效性。
利用基于多项式回归逼近的LED显示色域变换技术建立了从RGB色域到XYZ色域的转换关系，进而完成色度采集。本文的研究成果开创了单独用彩色CCD原型机来采集LED色度和校正LED屏幕的先例，有较大的理论和实用参考价值，为今后深入研究打下了理论基础、积累了实践经验。
Chroma parameters of XYZ should be acquired before calibration to LED display.There are two kinds of existing chroma collecting devices: point collection device andsurface collection device. Point collection device is inexpensive, being simple tooperate, but it can not be mass collecting. Surface collection device can be masscollecting, but it is very expensive and not easy to operate. One of the commonchroma collection devices is CCD prototype. It can collect data of RGB color gamutof LED pixels. Its tristimulus values are different from human·s vision. They shouldbe changed to a device independent color gamut, for example, XYZ. This paperproposes a color gamut transformation technology of LED based on polynomialregression and approximation. Using this method can transform the acquired RGBdata of color CCD prototype to CIE standard XYZ color gamut data. Chromacollection can be finished consequently. It is not expensive, easy to operate. It canaccomplish collecting of color gamut in mass surface and give consideration toadvantages of point collecting device and surface device. It is a convenient andeffective color gamut collecting method.
Full text can be mainly devided into three parts:
At first, related contents on collection of sample data for color gamuttransformation are introduced, include: curved surface modification and noisereduction for color CCD prototype, location and recognition of LED pixels, extraction of sample·s color gamut data in RGB and XYZ. It can provide data for color gamuttransformation.
Secondly, LED display·s color gamut is transformed using method of polynomialregression and approximation. The relationships between spectral response curve ofCCD prototype, tristimulus of CIE XYZ and curve of spectrum of LED are analysed.Characterized convergence factors of the matrix can be obtained. Then polynomialmethod in target color analysis methods should be used to find out the multinomialcoefficients in best situation of matching when sample LED pixels· values of RGBand XYZ are substituted. Minimum error is counted out. Transfer matrix of red, greenand blue from RGB to XYZ of LED display is acquired consequently.
At last, in order to test and verify validity of transformation, chromatic aberration,photos before calibration and after calibration are given out. Furthermore,comparisons between polynomial regression method and neural network method andLUT method are made. Accuracy and validity of this method is tested and verified.
Color gamut transformation technology of LED base on polynomial regressionand approximation sets up the relationship between color gamut of RGB and XYZand then accomplish the collection of chroma. The research result of this paper opensup the precedent that only using CCD prototype to collect LED display·s chroma andcalibrate the LED display. It is valuable both in theory and in practice. It lays a solidfoundation for theoretical basis and practical experience for future.
全文主要由三部分组成：
首先，介绍了色域转换样本数据提取的相关内容，其中包括：彩色CCD原型机的曲面修正、噪声去除、样本LED点的定位、识别、RGB数据及XYZ色域数据的提取，为色域转换提供数据。
其次，利用多项式回归逼近法对CCD原型机采集到的RGB数据进行转换。先利用光谱分析法分析CCD原型机的光谱函数曲线、LED的光谱曲线和CIE1931三刺激函数曲线的关系，转换矩阵的特性化收束因子由此得出，然后利用目标色分析法中的多项式法，把样本LED像素点的RGB值和XYZ值代入，找到拟合最佳的情况下的多项式系数，求出最小误差，从而找到CCD原型机采集到的RGB数据转换成XYZ色域数据的红绿蓝转换矩阵。
最后，为验证转换的正确性，给出色差和校正前后的图片对比，并把多项式回归逼近法与神经网络法和查表法进行对比，验证该方法的精确性及有效性。
利用基于多项式回归逼近的LED显示色域变换技术建立了从RGB色域到XYZ色域的转换关系，进而完成色度采集。本文的研究成果开创了单独用彩色CCD原型机来采集LED色度和校正LED屏幕的先例，有较大的理论和实用参考价值，为今后深入研究打下了理论基础、积累了实践经验。
Chroma parameters of XYZ should be acquired before calibration to LED display.There are two kinds of existing chroma collecting devices: point collection device andsurface collection device. Point collection device is inexpensive, being simple tooperate, but it can not be mass collecting. Surface collection device can be masscollecting, but it is very expensive and not easy to operate. One of the commonchroma collection devices is CCD prototype. It can collect data of RGB color gamutof LED pixels. Its tristimulus values are different from human·s vision. They shouldbe changed to a device independent color gamut, for example, XYZ. This paperproposes a color gamut transformation technology of LED based on polynomialregression and approximation. Using this method can transform the acquired RGBdata of color CCD prototype to CIE standard XYZ color gamut data. Chromacollection can be finished consequently. It is not expensive, easy to operate. It canaccomplish collecting of color gamut in mass surface and give consideration toadvantages of point collecting device and surface device. It is a convenient andeffective color gamut collecting method.
Full text can be mainly devided into three parts:
At first, related contents on collection of sample data for color gamuttransformation are introduced, include: curved surface modification and noisereduction for color CCD prototype, location and recognition of LED pixels, extraction of sample·s color gamut data in RGB and XYZ. It can provide data for color gamuttransformation.
Secondly, LED display·s color gamut is transformed using method of polynomialregression and approximation. The relationships between spectral response curve ofCCD prototype, tristimulus of CIE XYZ and curve of spectrum of LED are analysed.Characterized convergence factors of the matrix can be obtained. Then polynomialmethod in target color analysis methods should be used to find out the multinomialcoefficients in best situation of matching when sample LED pixels· values of RGBand XYZ are substituted. Minimum error is counted out. Transfer matrix of red, greenand blue from RGB to XYZ of LED display is acquired consequently.
At last, in order to test and verify validity of transformation, chromatic aberration,photos before calibration and after calibration are given out. Furthermore,comparisons between polynomial regression method and neural network method andLUT method are made. Accuracy and validity of this method is tested and verified.
Color gamut transformation technology of LED base on polynomial regressionand approximation sets up the relationship between color gamut of RGB and XYZand then accomplish the collection of chroma. The research result of this paper opensup the precedent that only using CCD prototype to collect LED display·s chroma andcalibrate the LED display. It is valuable both in theory and in practice. It lays a solidfoundation for theoretical basis and practical experience for future.
引文
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