Posts cs131-lecture-3-Filters-and-convolutions
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cs131-lecture-3-Filters-and-convolutions

概述

What is filtering:Forming a new image whose pixel values are transformed from original pixel values

影像處理中的濾波:把原來影像像素值透過某種轉換組合成新的影像

目標

  • 從影像中取出有用的訊息或轉換影像屬性
    • 擷取特徵:edge, corners, blobs detection…
    • 其他應用:超解析度成像super-resolution, 影像修復in-painting, 去噪de-noising

convolution & correlation

convolution 公式:

correlation 公式:

compare with convolution & correlation

convolution的符號是\(f*g\),correlation的符號是\(f**g\) convolution先對filter mask做轉置再做correlation

參考

影像修復matlab example

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