改良式IHS融合技術應用於IKONOS衛星影像之研究

An Improved IHS Fusion Technique Applied to IKONOS Satellite Imagery

隨著科技的蓬勃發展，衛星影像的解析度也隨之提升，其中如IKONOS與QuickBird衛星影像，均可提供高解析度全色態影像及低解析度多光譜影像，使用者可依需求來處理應用。以影像判讀而言，全色態影像固然提供詳細的地物、地貌，但常常仍須依靠多光譜影像的色彩資訊來輔佐目標識別，而運用影像融合技術則可結合全色態影像與多光譜影像的優點。影像融合過程中，色偏是難以避免的現象，飽和度伸展IH方法可有效補償IHS影像融合過程中飽和度壓縮的色偏問題，而本研究所提出之改良式IHS融合技術即以飽和度伸展IHS影像融合技術為基礎，並納入衛星影像的光譜特性與合理飽和度伸展參數來改良之，其融合成果有效改善了色偏現象，適合提供影像判讀之運用。

Along with the prosperous developments of science and technology, the resolution of satellite imagery is also improved. High resolution panchromatic and low resolution multispectral imagery can be provided by satellites, such as IKONOS and QuickBird. The user can use depend on demand.For imagery interpretation, detailed features and relief can be acquired by the panchromatic imagery, but the color information of multispectral imagery is often assisted for target recognition. Image fusion techniques, however, can combine the advantages of panchromatic and multispectral imagery. The color distortion is a hardly unavoidable phenomenon during the process of image fusion. The saturation stretching IHS (SSIHS) method can compensate the color distortion of saturation compression by IHS method. Hence, the improved IHS fusion technique is based on SSIHS. It considers both spectral characteristic of satellite imagery and reasonable parameter of saturation stretching. The result imagery indeed can improve color distortion effectively, and be suited for the applications of imagery interpretation.