| 研究生: |
林成樺 Lin, Cheng-Hua |
|---|---|
| 論文名稱: |
基於超像素與小波轉換的影像尺寸縮放演算法 Superpixel and Wavelet Based Seam Carving for Image Resizing |
| 指導教授: |
陳進興
Chen, Chin-Hsing |
| 學位類別: |
碩士 Master |
| 系所名稱: |
電機資訊學院 - 電腦與通信工程研究所 Institute of Computer & Communication Engineering |
| 論文出版年: | 2018 |
| 畢業學年度: | 106 |
| 語文別: | 英文 |
| 論文頁數: | 52 |
| 中文關鍵詞: | 影像縮放 、超像素分割 、小波轉換 |
| 外文關鍵詞: | Image resizing, Superpixel segmentation, Wavelet decomposition |
| 相關次數: | 點閱:42 下載:0 |
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裁縫演算法為影像縮放方法之一,此演算法因其便利性及廣泛性受到注目,然而,裁縫演算法存在邊緣不連續及顯著目標物偵測失衡等問題。本論文以改進裁縫演算法的顯著圖與分散裁縫分佈兩步驟為基礎提出一更佳的影像縮放方法。所提方法以小波轉換取得影像細微資訊解決邊緣不連續的問題,超像素分割技術偵測影像中的顯著目標物,根據取得的區域及全域顯著圖的閥值來混合兩者,接者,記錄每次裁縫的位置,藉由增強這些位置的顯著值來達到分散裁縫的目的。
實驗結果顯示所提演算法較能保留顯著目標物,同時在不顯著區域避免嚴重失真,對具有線條/架構的影像類型有較低的幾何失真,而對具有前景的影像類型有較低的影像資訊遺失。
Seam carving is one of image resizing methods. The resulting image has the issue of producing distortion in the main content of images. One way to improve seam carving is to fuse local and global saliency information to generate the final saliency map. In our proposed method, the saliency values of local saliency map are acquired by using the wavelet transform and the saliency values of global saliency map are acquired by using superpixel segmentation. In the proposed saliency map fusion, the degree of contribution from local and global saliency is determined by comparing their values. To prevent the seam distribution from being too concentrate, the saliency value at the removed seam locations are increased.
Experiments show that our improved seam carving method can protect the main content and carve the background more uniformly. Objective analysis using the distortion value proposed in [5] shows that our improved seam carving method has less information loss than the seam carving method for P/F type images and less geometric distortion for L/G type images.
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校內:2023-02-01公開