TDI (Time Delay Integration)は、CCDの特殊な読み出し方式です。CCDでは電荷読み出しの時、1ライン単位で垂直転送を行います。この転送のタイミングと対象像の移動するタイミングを合わせれば、CCDの垂直段数だけ露光することができます。この方式をTDIと言い、移動物体を高速かつ高感度で撮影することが可能です。
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