On the Preferrde Color Reproduction of Hardcopy Imaging Based on the Visual Characteristics and Evaluation of image Quality

本文研究了彩色负片和报纸印刷电视图像的彩色再现性的改进。提出了一种从彩色影视底片图像中检测肤色和人脸图案区域的新方法，该方法以人脸图案的色度和面积、周长等几何形状信息为基础，测量了影视底片图像中约4000种肤色，并计算了这些颜色的色度r、g。根据测得的色度值制作肤色图，并计算出用于电视图像打印的颜色变换矩阵。在检测出人脸模式后，首先利用肤色矩阵对一个区域进行颜色变换，然后对另一个区域进行全色矩阵处理，最后将两个区域合成并打印出来。该方法已成功地应用于报纸印刷和热敏印刷中，我们相信，基于模式识别的方法可以应用于各种成像系统中提高色彩再现性。

We have studied on the improvement of color reproduction of negative color film and newspaper printing from television picture. A new method of detecting skin color and facial pattern regions from negative color film and television picture was developed, using as a base, chromaticities and geometrical shape information of facial patterns such as area and perimeter.In the television picture, about 4000 skin colors were measured and the chromaticities r, g of those colors were calculated. A skin color chart was made from measured chromaticities, and color transformation matrix was calculated for printing from a TV picture. After the facial pattern was detected, color of its regions was transformed by skin color matrix, and another region was processed by a full color matrix, then both regions were synthesized and printed. This method was successfully applied to newspaper printing and thermal printing.We beleive that our approch based on the pattern recognition can be applied for improvement of color reproduction in various kinds of imaging systems.