調變轉換函數MTF(Modulation Transfer Function)是評估光學系統效能的一個重要指標，在本論文中，我們使用量測MTF的方式來評價手機影像防振系統的效能。 我們由分析在環境靜止的條件下所拍攝到的相片可以得到Modulation 為Mo，由分析在振動環境下所得到的相片可以得到Modulation為Mi，而MTF的定義為 MTF=Mi/Mo 。 造成拍照時影像模糊的主要原因為較長的曝光時間與拍照時相機的振動，因此我們可以利用不同的曝光時間搭配不同振動頻率等條件下，分別計算出防振系統作動時的MTF與防振系統關閉時的MTF，以此來評價防振系統的效能。 Modulation transfer function MTF is an important indicator to evaluate the performance of the optical system. In this paper, we use the MTF measurement methods to verify performance of anti-shake systems for camera phones. We analysis modulation for captured pictures under the conditions of stationary as Mo, and modulation for captured pictures under the conditions of vibration as Mi , and is defined Mi/Mo as MTF. The key issues resulted in blurred images when taking pictures are due to longer exposure time and the vibration of the camera, so we can calculate MTF for anti-shake systems with on and off condition under different exposure time and different frequencies of vibration, in order to evaluate the effectiveness of anti-shake system.
