基于非理想打印机模型的半色调化图像质量评价方法研究

胶印工艺中印刷的内容需要半色调化成二值图像。为了评价半色调化算法和图像的质量，就要对输出图像的设备建模。现有的建模方法都基于理想打印机，假定输出图像的像素和输出设备的一个矩形区域的状态对应。然而理想打印机反映不了实际胶印工艺中的像素点重叠、极小网点丢失、网点扩大等基本现象。本研究的目标是建立一个面向胶印工艺的打印机模型，用于半色调化图像质量评价算法的研究。

Quality Assessment for Halftone Image Based on Non-ideal Printer Model

The pages to print need to be converted into halftone image in offset printing procedure. 1}o model the offset printing procedure is the basis of evaluating the duality of halftone image for offset printing. The ideal printer model is assumed in previous researches, i. e. every pixel in halftone image is corresponding to print or blank a small rectangle in the printing media. I}he ideal printer model ignores phenomena of dot gain, missing isolated pixels and clustered dots under a certain limit. This research is to establish a non-ideal printer model for offset printing procedure and incorporate it in halftone images quality assessment algorithm.