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

我们研究了从电视画面中提高彩色底片和报纸印刷的色彩再现性。提出了一种从负片彩色影视图像中检测肤色和人脸纹样区域的新方法，该方法以人脸图像的色度和几何形状信息(如面积、周长)为基础，测量了约4000种肤色，并计算了这些颜色的色度r、g。根据测量的色度制作肤色图，并计算用于从电视图像打印的颜色转换矩阵。在检测到人脸图案后，利用肤色矩阵对其区域进行颜色变换，对另一个区域进行全色矩阵处理，然后对两个区域进行合成和打印。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的色彩再现。

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.