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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/88112

    Title: 以直方圖為基礎之多閥值搜尋演算法應用於彩色多物體切割
    Other Titles: A histogram-based multi-threshold searching algorithm for multiple color objects segmentation
    Authors: 陳煒傑;Chen, Wei-Chieh
    Contributors: 淡江大學電機工程學系碩士班
    Keywords: 多物體切割;彩色影像閥值技術;多閥值搜尋;ratio-map影像;Multi-object segmentation;color image thresholding;multilevel thresholding;multi-threshold searching;ratio-map image
    Date: 2012
    Issue Date: 2013-04-13 12:01:20 (UTC+8)
    Abstract: 本論文設計了一種無監督式搜尋多色彩閥值的方法,並且可應用於彩色多物體的切割。現有的色彩閥值切割技術大多需要利用各顏色通道資訊,透過人工調整方式選擇適當的參數,將所感興趣的彩色物體與背景分離。本論文中提出了一種無監督式多閥值搜尋的演算法,其可自動搜尋各彩色物體的最佳門檻值,並利用此資訊從影像中切割出感興趣的彩色物體。為了達到此目的,首先將提出一個新穎的ratio-map影像計算方法,其能夠有效的提高前景像素與背景像素的對比度。接著套用傳統Otsu演算法於ratio-map影像中,即可使得影像中前景彩色物體能從背景中被切割出來。最後,本論文亦提出了一個新的以直方圖為基礎之多閥值搜尋演算法,用來搜尋色調、飽和度以及明亮度三通道的最佳上限與下限門檻值,進而切割影像中所有的彩色物體。在實驗結果的部分,將呈現以本論文所提出的方法之切割結果。實驗證明本論文的方法可以成功地切割出所有感興趣的彩色物體,達到色彩切割或色彩建模的目的。
    This thesis addresses the issue of unsupervised multi-color thresholding design for color-based multiple objects segmentation. Most of the current color thresholding techniques require setting threshold values of each color channel for multiple colors-of-interest in a supervised way. In this thesis, an unsupervised multi-threshold searching algorithm is proposed to automatically search the optimal threshold values for segmenting multiple color objects. To achieve this, a novel ratio-map image computation method is proposed to efficiently enhance the contrast between foreground and background pixels. The Otsu’s method is then applied to the ratio-map image to extract all foreground color objects from the background image. Finally, a new histogram-based multi-threshold searching algorithm is proposed to search the optimal upper-bound and lower-bound threshold values of hue, saturation and brightness components for each color object. Experimental results show that the proposed method succeeds to separate all color objects-of-interest in a realistic scenario.
    Appears in Collections:[電機工程學系暨研究所] 學位論文

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