彩色印刷圖像混合半色調(diào)化關(guān)鍵技術(shù)研究
[Abstract]:The digital image must be converted to the same image as the output device depth before the output. Image halftone is a technique that converts a higher depth image into a lower depth image, and makes both visually similar. The image half-tone technology has a wide application in many fields involving image output, such as printing, outdoor advertisement production, television, video games, animation, on-line image display and network transmission, etc., which is the key technology to decide the quality of the output image. The image half-tone technique is of great significance to the quality control and optimization of the output image, the color prediction of the output image, and the semi-tone image quality evaluation for different output devices. in that practical application, the limitation of the image output device, the diversification of the image output device, the subjective factor in the quality evaluation of the output image are brought to the research and application of the image semi-tone technology research and application, In this paper, based on the background of color printing, this paper aims to improve the quality of the output image, and based on the half-tone and related techniques of the image, the design method of the half-tone dither matrix based on the geometric segmentation is expanded to the color shift of the mixed half-tone. In-depth analysis of the quality evaluation system of the half-tone image Research. Main research results The method comprises the following steps of: (1), aiming at the defects that the existing hybrid half-tone dither matrix based on the Delaunay triangulation geometric division design exists in the difference of the density of the positive and negative cluster dots, and the reduction of the geometric division is proposed in the paper, The defect is to improve the density of the cluster dots in the practical application, and to improve the density of the cluster dots is to improve the quality of the output image. The key factors of the study are derived from the Euler's formula, and the properties of the geometric segmentation are derived from the Euler's formula, in which the properties of the full-triangular geometric segmentation can be used to explain the causes of the difference between the density and the density of the positive and negative cluster dots in the existing research results. The optimization of the geometry is put forward based on the properties. in the experiment, the ratio of the number of vertices to the number of subareas is improved from 0. 5 before the optimization to 0. More than 90. When the hybrid half-tone dither matrix is designed on the basis of the optimized geometric segmentation, the ratio of the density of the male and female cluster outlets is also improved to 0. and (2) a mixed half-tone with the same density of the positive and negative cluster dots is constructed by expanding the center point set of the initial bundle branch point, The method of the invention can further improve the density of the cluster dot in the mixed semi-tone image under the condition that the printing process is limited, so as to improve the printing quality. in order to verify the rationality of the expansion center point set method, the center point distribution before and after expansion is converted into a half-tone image in the experiment to In addition, the quadrilateral and the optimized geometric partition of the whole-quadrilateral geometry are also divided into four. The experimental results show that the peak signal-to-noise ratio (PSNR) of the half-tone image corresponding to the distribution of the center point before and after expansion is close to that of the half-tone image, and the quadrilateral quality factor and the quadrilateral quality in the optimized geometric partition are the same. (3) A simulated overprint error with half-tone image is presented, and the Yule-Nielsen Neugebauer color equation and the color offset color standard ISO1264 are used. 7. The method of calculating the color offset. In the experiment, the color offset of the mixed half-tone dither matrix and the color shift of the amplitude-modulated half-tone are studied in this paper. The results are as follows: the color offset of the mixed half-tone dither matrix generated with three different random number seeds and the color offset of the amplitude-modulated half-tone As a result, the mixed half-tone dither matrix is designed in this paper, and its color offset is complete. the requirements of the printing process can be met. (4) a unified non-ideal printer model for different image output devices A semi-tone image quality evaluation system based on mathematical morphology is studied in this paper. In addition, the small-point filtering algorithm proposed in this paper has set up the face-oriented glue. A non-ideal printer model for the process of printing process. The human visual system (HVS) model is used to calculate the image of human eye perception, and the model based on the non-ideal printer is tested. The experimental results of this paper show that the evaluation method is more effective than the evaluation method based on the ideal model.
【學(xué)位授予單位】:國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2010
【分類號(hào)】:TP391.41
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