紙頁勻度特征研究

電子信息工程論文編號:DZXX051  論文字數:10909,頁數:26

目    錄
摘 要 1
Abstract 2
前　言 4
第一章 紙頁勻度的研究情況 6
1.國內外研究現狀 6
1.1 β－射線透射式紙頁勻度儀 6
1.2 光透射式紙頁勻度儀 6
1.3 計算機圖像處理的基本原理 7
2.本課題以及論文的研究內容 8
 2.1本課題的研究內容 8
 2.2本論文的研究內容 9
第二章 紙頁勻度的分析 10
2.1 采集圖象 11
2.2 灰度分布直方圖 12
2.2.1．灰度分布直方圖的原理 12
2.2.2．實驗過程 13
2.2.3．小結 14
2.3均方差法 15
2.3.1均方差原理 15
2.3.2實驗和分析過程 15
2.3.3小結 21
第三章 結論 23
3.1本論文的主要研究結論 23
3.2需要進一步研究的問題 23
3.3展望 24
致謝 25

摘  要
 紙頁勻度指的是紙頁在三維方向上的質量均勻性，或者說是紙頁在三維方向的質量分布。紙頁勻度是評價紙張質量的一個很重要的指標，也是紙頁的最重要性能之一。紙頁勻度不好不但影響到紙的外觀，而且影響到幾乎所有的物理性能，光學性能和印刷性能；紙頁勻度還影響著整飾后紙頁的表觀性能，如影響著壓光后紙頁的平滑度；影響著紙頁的光學性能，包括白度和光澤度等。因此需要對紙頁勻度問題引起重視，并切實加以解決。
 本文利用計算機視覺系統采集紙頁的勻度圖像，然后通過MATLAB軟件處理紙頁的勻度圖像獲取我們需要的RGB值和灰度分布直方圖，再進一步求灰度值、平均灰度值和均方差；通過分析這些數據比較不同紙樣的勻度情況。灰度分布直方圖可以讓我們可以直觀定性的判斷出紙頁勻度的好壞，均方差則是通過數據的分析比較，得出紙頁勻度好壞的定量結果。

關鍵詞 計算機視覺；紙頁勻度；灰度；直方圖；均方差

Abstract
 Paper formation refers to the pages in the direction of the three-dimensional quality of Uniformity , Or it can be said that three--dimensional pages in the direction of the mass distribution. Paper formation is a very important indicator of eva luating page quality, as well as one of the most important properties of pages. Poor paper formation not only affects the appearance, but also affects almost all of the physical properties and optical properties and print properties. Paper Formation also affects the pages after finishing the apparent capabilities, such as pressure-affected after page of the paper smoothness;  Paper Formation affect the optical properties, including brightness and shiny and so on. There is a pressing need for technology workers in the paper pages formation  to pay attention to the problem, and to caddress them effectively.
 Using computer vision system to acquisition pages formation  of the images, Then with MATLAB software for pages formation  of  the images we need access to the RGB values and gray histogram distribution, and for Gray value the average gray value and variance;These data compared different pattern of the formation through analysis. Gray distribution histogram enables us directly determine the formation  good or bad from the histogram on the pages, variance is through the analysis of data comparing to Reach pages formation quality of the quantitative results.
Keywords Computer Vision; Paper Formation; Gray; Histogram Variance; mean-square deviation